3,511 results
Search Results
2. Carbonate Phase in the Formation of Binding Substance in Dolomite Cement
- Author
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Shelikhov, Nikolay, Sagdiev, Ruslan, di Prisco, Marco, Series Editor, Chen, Sheng-Hong, Series Editor, Vayas, Ioannis, Series Editor, Kumar Shukla, Sanjay, Series Editor, Sharma, Anuj, Series Editor, Kumar, Nagesh, Series Editor, Wang, Chien Ming, Series Editor, and Vatin, Nikolai, editor
- Published
- 2021
- Full Text
- View/download PDF
3. Characteristics and Environmental Significance and Physical and Chemical Properties of Karst Cave Water in Shuanghe Cave, Guizhou Province (in China)
- Author
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Zhang, Jie, Zhou, Zhongfa, Cao, Mingda, Pan, Yanxi, Diniz Junqueira Barbosa, Simone, Series editor, Chen, Phoebe, Series editor, Du, Xiaoyong, Series editor, Filipe, Joaquim, Series editor, Kara, Orhun, Series editor, Kotenko, Igor, Series editor, Liu, Ting, Series editor, Sivalingam, Krishna M., Series editor, Washio, Takashi, Series editor, Yuan, Hanning, editor, Geng, Jing, editor, and Bian, Fuling, editor
- Published
- 2017
- Full Text
- View/download PDF
4. Inversion of reservoir quality by early diagenesis: an example from the Triassic Buntsandstein, offshore the Netherlands
- Author
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Purvis, K., Okkerman, J. A., Rondeel, H. E., editor, Batjes, D. A. J., editor, and Nieuwenhuijs, W. H., editor
- Published
- 1996
- Full Text
- View/download PDF
5. Fracture properties of GGBS-dolomite geopolymer concrete
- Author
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P., Saranya, Nagarajan, Praveen, and Shashikala, A.P.
- Published
- 2024
- Full Text
- View/download PDF
6. A Review Paper on Experimental Study of Effect on Concrete Properties with Partial Replacement of Cement with Dolomite Powder
- Author
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Vijaykumar. P. Bhusare
- Subjects
Cement ,Materials science ,Dolomite ,Metallurgy - Published
- 2019
7. Laser ablation of paper: Raman identification of products.
- Author
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Balakhnina, Irina, Brandt, Nikolay, Chikishev, Andrey, Rebrikova, Natalia, and Yurchuk, Yuliya
- Subjects
LASER ablation ,RAMAN spectroscopy ,PULSED lasers ,BLEACHING (Chemistry) ,TITANIUM dioxide ,DOLOMITE ,CELLULOSE - Abstract
Old paper samples are bleached using pulsed laser radiation with a wavelength of 532 nm. The ablation products of five paper samples that differ by composition and production dates are studied using Raman microspectroscopy. Cellulose, protein, calcite, titanium dioxide (anatase, rutile, and brookite), quartz, lazurite, bonattite, and dolomite are identified as ablation products. [ABSTRACT FROM AUTHOR]
- Published
- 2014
- Full Text
- View/download PDF
8. Comparative possibilities of using limestone 'Visočica' and dolomite 'Virpazar' as fillers in paper production
- Author
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Nada Z. Blagojević, Milun M. Krgović, and Nikola S. Blagojević
- Subjects
Materials science ,business.product_category ,paper pulp ,General Chemical Engineering ,fillers ,Dolomite ,Mineralogy ,Raw material ,engineering.material ,lcsh:Chemical technology ,chemistry.chemical_compound ,Air permeability specific surface ,Tearing ,lcsh:TP1-1185 ,Pulp (paper) ,paper ,Metallurgy ,Paper production ,General Chemistry ,cellulose ,Paper machine ,retention agens ,chemistry ,engineering ,Carbonate ,business - Abstract
Non-metallic mineral fillers strongly influence the characteristics and quality of paper. "Visocica" limestone and "Virpazar" dolomite were used to prepare paper samples in this study. The characteristics of such paper samples produced on a laboratory paper machine are presented. The used fillers and paper pulp were also characterized. The following paper characteristics were investigated: gramature, thickness, softness, air permeability, resistance to tearing and stretching, paper ash and retention. The experiments were performed in order to compare the influence of the physico-chemical and structural qualities of the examined carbonate type fillers on the paper properties. The results of the investigation indicated the technological reasons for using these non-metallic mineral raw materials as fillers in the paper industry regarding the mechanical paper characteristics, as well as other properties.
- Published
- 2004
9. PRACTICE PAPER JEE MAIN 2024.
- Subjects
CHEMICAL formulas ,MOLECULES ,ORBITAL hybridization ,HEAT of formation ,MOLECULAR weights ,DOLOMITE - Abstract
The article presents a quiz on various chemistry topics, including questions on amines, organic compounds, hybridization, and oxidation numbers.
- Published
- 2024
10. Regarding the Paper on the Dolomite Problem.
- Author
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Oard, Michael J.
- Subjects
- *
DOLOMITE - Published
- 2023
11. Regarding the Paper on the Dolomite Problem.
- Author
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Heerema, Stef J. and Matthews, John D.
- Subjects
- *
DOLOMITE , *EVAPORITES , *HOT water - Published
- 2023
12. Comment on Ossa Ossa et al. (2018) paper published in EPSL.
- Author
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Préat, Alain and Weber, Francis
- Subjects
- *
ANALYTICAL geochemistry , *STRATIGRAPHIC geology , *DEOXYGENATION , *DOLOMITE , *SULFATES - Published
- 2019
- Full Text
- View/download PDF
13. Discussion for comments of Ehrenberg and Bjørlykke on paper 'Formation mechanism of deep Cambrian dolomite reservoirs in the Tarim basin, northwestern China'
- Author
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Dongya Zhu
- Subjects
Stratigraphy ,Dolomite ,Tarim basin ,Geology ,02 engineering and technology ,010502 geochemistry & geophysics ,Oceanography ,01 natural sciences ,Hydrothermal circulation ,Paleontology ,Geophysics ,020401 chemical engineering ,Dolomitization ,Economic Geology ,0204 chemical engineering ,China ,Mechanism (sociology) ,0105 earth and related environmental sciences - Abstract
In the paper “Formation mechanism of deep Cambrian dolomite reservoirs in the Tarim basin, northwestern China” ( Zhu et al., 2015 ), we concluded that hydrothermal alteration further enhanced porosity in the deep Cambrian dolomite reservoirs in the Tarim Basin, NW China. Professor Ehrenberg and Bjorlykke made comments that the hydrothermal dolomitization and increase in porosity were not well supported and casted doubt on the exploration potential. We insist the influence of hydrothermal alteration on and large exploration potential in the deep Cambrian dolomite reservoirs due to the unique geological conditions and the recent exploration results.
- Published
- 2016
14. Comments regarding hydrothermal dolomitization and porosity development in the paper 'Formation mechanism of deep Cambrian dolomite reservoirs in the Tarim basin, northwestern China' by Zhu et al. (2015)
- Author
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Stephen N. Ehrenberg and Knut Bjørlykke
- Subjects
020209 energy ,Stratigraphy ,Dolomite ,Geochemistry ,Tarim basin ,Geology ,02 engineering and technology ,010502 geochemistry & geophysics ,Oceanography ,01 natural sciences ,Hydrothermal circulation ,Paleontology ,Geophysics ,0202 electrical engineering, electronic engineering, information engineering ,Dolomitization ,Economic Geology ,Porosity ,Mechanism (sociology) ,0105 earth and related environmental sciences - Published
- 2016
15. MINERAL FILLERS IN PAPER
- Author
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Ken Beazley
- Subjects
Mineral ,Materials science ,Dolomite ,Metallurgy ,Mineralogy ,Conservation ,Aluminium silicate ,engineering.material ,Talc ,law.invention ,chemistry.chemical_compound ,Calcium carbonate ,chemistry ,law ,Filler (materials) ,Titanium dioxide ,Media Technology ,medicine ,engineering ,General Materials Science ,Calcination ,medicine.drug - Abstract
Summary The paper is divided into two parts. In Part 1, after a brief historical introduction the advantages and disadvantages of using mineral fillers in the manufacture of paper are summarised. Details of the origin, methods of production and basic physical properties of kaolin, natural calcium carbonate, precipitated calcium carbonate, talc and titanium dioxide follow. These are supplemented by more limited information on dolomite, calcium sulphate, calcined clay, satin white, barium sulphate and ultrafine fillers such as hydrated alumina, diatomaceous earth and precipitated sodium aluminium silicate. Factors determining paper permanence are then discussed, and the influence of fillers on permanence considered. Part 2 is concerned with the identification of fillers in paper. It deals with the separation of filler from fibre and methods of elemental analyses. These include wet chemical techniques, details of which are supplied in an appendix, x-ray fluorescence, classical optical spectroscopy and atomic...
- Published
- 1991
16. Structural style and hydrocarbon trap of Karbasi anticline, in the Interior Fars region, Zagros, Iran.
- Author
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Maleki, Z., Arian, M., and Solgi, A.
- Subjects
HYDROCARBON reservoirs ,ANTICLINES ,GEOLOGIC faults ,STRATIGRAPHIC geology ,CARBONATE rocks ,DOLOMITE - Abstract
Karbasi anticline between west-northwest parts of Jahrom town is located in northwest 40 km distance of Aghar gas anticline in interior Fars region. This anticline has asymmetric structure and some faults with large strike separation observed in its structure. The operation of Nezamabad sinistral strike slip fault in west part of this anticline caused fault plunge change in this region. Because of complication increasing of structures geometry in Fars region and necessity to exploration activities for deeper horizons especially the Paleozoic ones, the analysis of fold style elements, which is known as one of the main parts in structural studies seems necessary. In this paper because of some reasons such as Karbasi anticline structural complication, importance of drilling and hydrocarbon explorations in Fars region, it is proceed to analysis and evaluation of fold style elements and geometry with emphasis on Nezamabad fault operation in Interior Fars region. According to fold style elements analysis results, it became clear that in east part of anticline the type of fold horizontal moderately inclined and in west part it is upright moderately plunging, so west evaluation of anticline is affected by more deformation. In this research the relationship present faults especially the Nezamabad sinistral strike slip one with folding and its affection on Dehram horizon and Bangestan group were modeled. Based on received results may be the Nezamabad fault is located between G-G' and E-E' structural sections and this fault in this area operated same as fault zone. In different parts of Karbasi anticline, Dashtak formation as a middle detachment unit plays an important role in connection to folding geometry, may be which is affected by Nezamabad main fault. [ABSTRACT FROM AUTHOR]
- Published
- 2014
- Full Text
- View/download PDF
17. Fine grinding of limestone and dolomite for the paper industry
- Author
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E. Forssberg and O.A. Orumwense
- Subjects
chemistry.chemical_compound ,Materials science ,Calcium carbonate ,chemistry ,Specific surface area ,Metallurgy ,Dolomite ,Particle-size distribution ,Carbonate ,Mill ,Pulp and paper industry ,Ball mill ,Grinding - Abstract
Calcium carbonate can replace kaolin as filler and pigment for some kinds of paper. Calcium carbonate can be produced domestically at a lower price than imported kaolin. Domestic materials have to be cleaned by means of flotation to remove silicates and iron-bearing minerals. After flotation, the carbonate concentrate will have to be ground to 50 to 90% - 2 microns for various applications where a specified particle size distribution is required. Different kinds of fine grinding equipment have been tested for this purpose. Mills tested include attrition mills, annular ball mills and vibro-energy mills. It has been found that the attrition mill produces a wide particle size distribution and a product with a large specific surface area. On the other hand, the vibro-energy mill produces a steep particle size distribution and a product with a smaller specific surface area. The paper will also describe classification experiments with small hydrocyclones to produce a steep particle size distribution. The vibro-energy mill has been tested in detail and the influence of various parameters such as frequency, amplitude, solids concentration, media filling and lead angle has been investigated.
- Published
- 1988
18. 四川盆地及周缘地区震旦系灯影组白云岩岩石类型 及沉积相划分方案.
- Author
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文华国, 文 龙, 丁-, 周 刚, 钟怡江, 严 威, 马 奎, 钟 原, 王文之, 张 亚, 武鲁亚, 何 宇, 邹浩文, and 许亚鑫
- Abstract
Copyright of Natural Gas Industry is the property of Natural Gas Industry Journal Agency and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2024
- Full Text
- View/download PDF
19. Issue Information.
- Subjects
DOLOMITE ,PETROLEUM geology ,HYDROCARBON reservoirs ,CARBONATE minerals ,PARAGENESIS - Abstract
B In this issue... b Papers in this thematic issue focus on Zechstein petroleum system elements in the North Sea and adjacent areas. The following three papers report on Z2 (Hauptdolomit) Zechstein carbonate platforms in and around the Mid North Sea High (MNSH), a Variscan uplift offshore eastern England, and its extension to the SE in Dutch waters known as the Elbow Spit High. However a separate Zechstein reservoir unit at the Jarvis structure consists of Z2 and Z3 dolomites which contain oil whose origin has not been studied before in detail. [Extracted from the article]
- Published
- 2023
- Full Text
- View/download PDF
20. Discussion for comments of Ehrenberg and Bjørlykke on paper “Formation mechanism of deep Cambrian dolomite reservoirs in the Tarim basin, northwestern China”.
- Author
-
Zhu, Dongya
- Subjects
- *
DOLOMITE , *GEOLOGICAL formations , *RESERVOIRS , *DISSOLUTION (Chemistry) - Abstract
In the paper “Formation mechanism of deep Cambrian dolomite reservoirs in the Tarim basin, northwestern China” ( Zhu et al., 2015 ), we concluded that hydrothermal alteration further enhanced porosity in the deep Cambrian dolomite reservoirs in the Tarim Basin, NW China. Professor Ehrenberg and Bjørlykke made comments that the hydrothermal dolomitization and increase in porosity were not well supported and casted doubt on the exploration potential. We insist the influence of hydrothermal alteration on and large exploration potential in the deep Cambrian dolomite reservoirs due to the unique geological conditions and the recent exploration results. [ABSTRACT FROM AUTHOR]
- Published
- 2016
- Full Text
- View/download PDF
21. The use of structural geology in the mineral exploration industry.
- Author
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Hobbs, B. E.
- Subjects
STRUCTURAL geology ,PROSPECTING ,MINERAL industries ,GEOLOGICAL modeling ,DRILL core analysis ,DOLOMITE - Published
- 2023
- Full Text
- View/download PDF
22. Comments regarding hydrothermal dolomitization and porosity development in the paper “Formation mechanism of deep Cambrian dolomite reservoirs in the Tarim basin, northwestern China” by.
- Author
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Ehrenberg, Stephen Neville and Bjørlykke, Knut
- Subjects
- *
HYDROTHERMAL deposits , *POROSITY , *GEOLOGICAL formations , *DOLOMITE , *RESERVOIRS - Published
- 2016
- Full Text
- View/download PDF
23. A PROCEDURE FOR THE GRAVIMETRIC QUANTIFICATION OF TOTAL ORGANIC CARBON AND CARBONATES IN NATURAL ROCKS FOCUSED ON MINERAL AND COAL PROCESSING.
- Author
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VILASÓ-CADRE, Javier E., REYES-DOMÍNGUEZ, Iván A., and PIÑA, Juan J.
- Subjects
CARBONATE rocks ,SCANNING electron microscopy ,FERRIC oxide ,HEAT treatment ,MINERALOGY ,DOLOMITE - Abstract
This paper presents a gravimetric method for the quantification of total organic carbon by ignition at 1100°C and carbonates by acid dissolution in rock samples containing coal. Two minerals (CM-1 and CM-2) and a subbituminous coal (SBC) were used in the study. The mineralogical characterization of the samples was performed by X-ray diffraction and scanning electron microscopy. This revealed the presence of calcite in samples CM-1 (20.4%) and CM-2 (74.7%), dolomite in CM-2 (0.7%), and graphite in sample SBC (42.6%). To eliminate carbonates, the samples were treated with 4 mol/L HCl, which allowed quantification. Results of the carbonate gravimetric quantification were compared with those obtained with a calcimeter. A significant difference was observed for the sample CM-2 (70.3% versus 63.4% by calcimetry, p-value = 0.0042). For the sample without carbonates, no differences were observed for loss on ignition without and with the acid treatment, so this is not necessary for this type of sample. A morphological study showed no significant surface change after acid treatment, but fracture of iron oxide particles was observed in CM-1 and CM-2 after heat treatment. In this study it was demonstrated that rock mineralogy is essential to correctly analyze organic and inorganic carbon content. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
24. Characteristics and genesis of shoal facies reservoir of the Lower Ordovician Tongzi Formation in southeastern Sichuan Basin, China.
- Author
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Ruiqing Tao, Hao Tang, Wei Yan, Yading Li, Qianwen Mo, Ling Li, Li Zhou, Tao Ma, Jinbiao An, Guoliang Xiao, and Xiucheng Tan
- Subjects
PETROLEUM prospecting ,STRATIGRAPHIC traps (Petroleum geology) ,RESERVOIR rocks ,DOLOMITE ,KARST - Abstract
The Lower Ordovician Tongzi Formation containing abundant shoal sediments is the most promising stratum for the petroleum exploration in the Sichuan Basin. However, the current studies mainly focus on the central part of the Basin, the systematic analysis of the southeastern part with well-developed shoal facies is lacking. This paper aims to clarify the characteristics and genesis of the Tongzi Formation reservoir in Southeastern Sichuan Basin, following an analysis of sedimentary facies within the sequence stratigraphic framework. The research shows that the main types of reservoir rocks are oolitic, intraclastic and bioclastic dolostones. And the reservoir spaces consist mainly of intergranular (dissolved) pores, inter-crystalline (dissolved) pores, intragranular dissolved pores and fractures. Among them, intergranular pores account for the highest proportion, which is followed by intragranular dissolved pores. In addition, most throats are necking and flaky which mainly connect intergranular and inter-crystalline pores, respectively. The diagenetic sequence shows that penecontemporaneous karst well improved the porosity of the reservoir in the early-stage although the cementation and compaction reduced parts of pores. The reservoir formation is associated with the tectonic-depositional settings, diageneses and terrigenous contamination. Paleohighlands and submerged uplifts, forming in the early Ordovician amalgamation between Yangtze and Cathaysia blocks, accumulated shoal sediments as the material basis for the reservoir formation. Penecontemporaneous karst forming intragranular dissolved pores and the dolomitization aiding grainstones to resist the pressure solution are the key to increasing porosity and preserving pores. The absence of terrigenous contamination prevented intergranular pores from being strongly cemented, which resulted in the reservoir difference between the central and southeastern Sichuan Basin. The study can be used as a reference for the further exploration of Ordovician petroleum in the Sichuan Basin and other regions owning similar geological settings. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
25. Thermal History and Hydrocarbon Accumulation Stages in Majiagou Formation of Ordovician in the East-Central Ordos Basin.
- Author
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Tao, Hua, Cui, Junping, Zhao, Fanfan, Ren, Zhanli, Qi, Kai, Liu, Hao, and Su, Shihao
- Subjects
CARBONATE reservoirs ,FLUID inclusions ,CARBONATE rocks ,NATURAL gas ,ORGANIC compounds ,DOLOMITE - Abstract
The marine carbonates in the Ordovician Majiagou Formation in the Ordos Basin have significant exploration potential. Research has focused on their thermal history and hydrocarbon accumulation stages, as these are essential for guiding the exploration and development of hydrocarbons. In this paper, we study the thermal evolution history of the carbonate reservoirs of the Ordovician Majiagou Formation in the east-central Ordos Basin. Furthermore, petrographic and homogenization temperature studies of fluid inclusions were carried out to further reveal the hydrocarbon accumulation stages. The results demonstrate that the degree of thermal evolution of the Ordovician carbonate reservoirs is predominantly influenced by the deep thermal structure, exhibiting a trend of high to low values from south to north in the central region of the basin. The Fuxian area is located in the center of the Early Cretaceous thermal anomalies, with the maturity degree of the organic matter ranging from 1 to 3.2%, with a maximum value of 3.2%. The present geothermal gradient of the Ordovician Formation exhibits the characteristics of east–high and west–low, with an average of 28.6 °C/km. The average paleo-geotemperature gradient is 54.2 °C/km, the paleoheat flux is 55 mW/m
2 , and the maximum paleo-geotemperature reaches up to 270 °C. The thermal history recovery indicates that the Ordovician in the central part of the basin underwent three thermal evolution stages: (i) a slow warming stage before the Late Permian; (ii) a rapid warming stage from the end of the Late Permian to the end of the Early Cretaceous; (iii) a cooling stage after the Early Cretaceous, with the hydrocarbon production of hydrocarbon source rocks weakening. In the central part of the basin, the carbonate rock strata of the Majiagou Formation mainly developed asphalt inclusions, natural gas inclusions, and aqueous inclusions. The fluid inclusions can be classified into two stages. The early-stage fluid inclusions are mainly present in dissolution holes. The homogenization temperature is 110–130 °C; this coincides with the hydrocarbon charging period of 210–165 Ma, which corresponds to the end of the Triassic to the end of the Middle Jurassic. The late-stage fluid inclusions are in the dolomite vein or late calcite that filled the gypsum-model pores. The homogenization temperature is 160–170 °C; this coincides with the hydrocarbon charging period of 123–97 Ma, which corresponds to the late Early Cretaceous. Both hydrocarbon charging periods are in the rapid stratigraphic warming stage. [ABSTRACT FROM AUTHOR]- Published
- 2024
- Full Text
- View/download PDF
26. Experimental Study on Preparation of Inorganic Fibers from Circulating Fluidized Bed Boilers Ash.
- Author
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Wang, Qingjia, Zhou, Tuo, Li, Zhiao, Ding, Yi, Song, Qiang, Zhang, Man, Hu, Nan, and Yang, Hairui
- Subjects
INORGANIC fibers ,YOUNG'S modulus ,RAW materials ,POLLUTION ,DOLOMITE - Abstract
The ash generated by Circulating Fluidized Bed (CFB) boilers is featured by its looseness and porosity, low content of glassy substances, and high contents of calcium (Ca) and sulfur (S), thus resulting in a low comprehensive utilization rate. Currently, the predominant treatment approach for CFB ash and slag is stacking, which may give rise to issues like environmental pollution. In this paper, CFB ash (with a CaO content of 7.64% and an SO
3 content of 1.77%) was used as the main raw material. The high-temperature melting characteristics, viscosity–temperature characteristics, and initial crystallization temperature of samples with different acidity coefficients were investigated. The final drawing temperature range of the samples was determined, and mechanical property tests were conducted on the prepared inorganic fibers. The results show that the addition of dolomite powder has a significant reducing effect on the complete liquid phase temperature. The final drawing temperatures of the samples with different acidity coefficients range as follows: 1270–1318 °C; 1272–1351 °C; 1250–1372 °C; 1280–1380 °C; 1300–1382 °C; and 1310–1384 °C. The drawing temperature of this system is slightly lower than that of basalt fibers. Based on the test results of the mechanical properties of inorganic fibers, the Young's modulus of the inorganic fibers prepared through the experiment lies between 55 GPa and 74 GPa, which basically meets the performance requirements of inorganic fibers. Consequently, the method of preparing inorganic fibers by using CFB ash and dolomite powder is entirely feasible. [ABSTRACT FROM AUTHOR]- Published
- 2024
- Full Text
- View/download PDF
27. 鄂尔多斯盆地寒武系—奥陶系天然气成藏模式 及有利勘探区.
- Author
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于 洲, 范立勇, 任军峰, 魏柳斌, 黄正良, 吴东旭, 白海峰, and 罗开通
- Abstract
Copyright of Natural Gas Industry is the property of Natural Gas Industry Journal Agency and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2024
- Full Text
- View/download PDF
28. Reactive transport modeling constraints on the complex genesis of a lacustrine dolomite reservoir: A case from the Eocene Qaidam Basin, China.
- Author
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Ying Xiong, Bo Liu, Xiu-Cheng Tan, Zheng-Meng Hou, Jia-Shun Luo, Ya-Chen Xie, Kai-Bo Shi, and Kun-Yu Wu
- Subjects
EVAPORITES ,MINERALOGY ,EOCENE Epoch ,PARAGENESIS ,SEDIMENTATION & deposition ,DOLOMITE - Abstract
Reactive transport modeling (RTM) is an emerging method used to address geological issues in diagenesis research. However, the extrapolation of RTM results to practical reservoir prediction is not sufficiently understood. This paper presents a case study of the Eocene Qaidam Basin that combines RTM results with petrological and mineralogical evidence. The results show that the Eocene Xiaganchaigou Formation is characterized by mixed siliciclastic-carbonate-evaporite sedimentation in a semiclosed saline lacustrine environment. Periodic evaporation and salinization processes during the syngeneticpenecontemporaneous stage gave rise to the replacive genesis of dolomites and the cyclic enrichment of dolomite in the middle-upper parts of the meter-scale depositional sequences. The successive change in mineral paragenesis from terrigenous clastics to carbonates to evaporites was reconstructed using RTM simulations. Parametric uncertainty analyses further suggest that the evaporation intensity (brine salinity) and particle size of sediments (reactive surface area) were important rate-determining factors in the dolomitization, as shown by the relatively higher reaction rates under conditions of higher brine salinity and fine-grained sediments. Combining the simulation results with measured mineralogical and reservoir physical property data indicates that the preservation of original intergranular pores and the generation of porosity via replacive dolomitization were the major formation mechanisms of the distinctive lacustrine dolomite reservoirs (widespread submicron intercrystalline micropores) in the Eocene Qaidam Basin. The results confirm that RTM can be effectively used in geological studies, can provide a better general understanding of the dolomitizing fluid-rock interactions, and can shed light on the spatiotemporal evolution of mineralogy and porosity during dolomitization and the formation of lacustrine dolomite reservoirs. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
29. Modeling and parametric optimization of air catalytic co-gasification of wood-oil palm fronds blend for clean syngas (H2+CO) production
- Author
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Muhammad Shahbaz, Abrar Inayat, Nagoor Basha Shaik, Muddasser Inayat, Shaharin Anwar Sulaiman, and Abdul Rehman Gilal
- Subjects
Renewable Energy, Sustainability and the Environment ,Dolomite ,Energy Engineering and Power Technology ,Biomass ,Tar ,02 engineering and technology ,Contamination ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Pulp and paper industry ,01 natural sciences ,0104 chemical sciences ,Catalysis ,law.invention ,Portland cement ,Fuel Technology ,law ,Environmental science ,Response surface methodology ,0210 nano-technology ,Syngas - Abstract
Syngas production from biomass gasification is a potentially sustainable and alternative means of conventional fuels. The current challenges for biomass gasification process are biomass storage and tar contamination in syngas. Co-gasification of two biomass and use of mineral catalysts as tar reformer in downdraft gasifier is addressed the issues. The optimized and parametric study of key parameters such as temperature, biomass blending ratio, and catalyst loading were made using Response Surface Methodology (RSM) and Artificial Neural Network (ANN) on tar reduction and syngas. The maximum H2 was produced when Portland cement used as catalyst at optimum conditions, temperature of 900 °C, catalyst-loading of 30%, and biomass blending-ratio of W52:OPF48. Higher CO was yielded from dolomite catalyst and lowest tar content obtained from limestone catalyst. Both RSM and ANN are satisfactory to validate and predict the response for each type of catalytic co-gasification of two biomass for clean syngas production.
- Published
- 2021
30. Industrial Assessment of the Carbonate Rocks of the Pila Spi Formation at Haibat Sultan Mountain, Iraqi Kurdistan Region
- Author
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Varoujan K. Sissakian, Mohammed J. Hamawandy, and Rahel Kh. Ibrahim
- Subjects
010506 paleontology ,Technology ,quarrying conditions ,Science ,Dolomite ,Geochemistry ,010502 geochemistry & geophysics ,01 natural sciences ,Group (stratigraphy) ,industrial assessment ,Chemical composition ,0105 earth and related environmental sciences ,General Environmental Science ,Cement ,geography ,geography.geographical_feature_category ,cement and paper industries ,Agriculture ,Ridge ,General Earth and Planetary Sciences ,Carbonate rock ,Iraqi kurdistan ,Geology ,pila spi formation - Abstract
The Pila Spi Formation is one of the prominent formations forming continuous ridges in Kurdistan Region. The thickness of the formation ranges from 15 to 110 m, consisting of well-bedded limestone, dolomite, dolomitic limestone, and very rare marl beds. The study area is located about 15 km east of Koya town, next to the abandoned tunnel through a deeply cut valley which has exposed 50 m of the formation. However, the uppermost part of the exposed section may belong to one of the Oligocene formations of Kirkuk Group. The study area was selected within the Pila Spi Formation because the rocks of the same formation and along the same ridge, about 45 km west of the study area showed encouraging results for cement industry. The average CaO is about 51%, whereas the average MgO is 1.8%. Therefore, eight samples were collected at constant thickness from the exposed section. The samples were subjected to X-ray fluorescence (XRF) test to indicate the main oxides in the sampled section. The acquired results from the XRF tests showed that the chemical composition of the exposed rocks within the Pila Spi Formation is suitable for cement industry, also for paper and paint but needs some treatment. Accordingly, another eight samples were collected from the same section to increase the density of sampling, totaling to 16 samples.
- Published
- 2020
31. Production Biofuels from Palm Empty Fruit Bunch by Catalytic Pyrolysis Using Calcined Dolomite
- Author
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Arif Hidayat, Heni Dewajani, and Muflih A. Adnan
- Subjects
Materials science ,020209 energy ,Mechanical Engineering ,Dolomite ,02 engineering and technology ,Catalytic pyrolysis ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Pulp and paper industry ,Catalysis ,law.invention ,Mechanics of Materials ,Biofuel ,law ,0202 electrical engineering, electronic engineering, information engineering ,General Materials Science ,Calcination ,0210 nano-technology ,Pyrolysis - Abstract
In this study, Palm Empty Fruit Bunch (PEFB) was utilized to produce bio-oil through non-catalytic and catalytic pyrolysis process. A fixed-bed reactor was applied to conduct pyrolysis experiments at atmospheric pressure. Comparison of bio-oils obtained from non-catalytic and catalytic pyrolysis wih different pyrolysis temperature was studied in terms product yield. The maximum bio-oil yield of 52.4% was obtained at pyrolysis temperature of 600 °C. Furthermore, based on Gas Chromatography-Mass Spectrophotoscopy (GC-MS) analysis, the percentage of phenolic compounds in bio-oil products from catalyzed pyrolysis showed more higher compared with the non-catalyzed pyrolysis.
- Published
- 2021
32. Air-gasification of pine sawdust using dolomite as in-bed material: Effects of gasification conditions on product characteristics
- Author
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Yu Bai, Yan Cao, and Du Jiang
- Subjects
Chemistry ,020209 energy ,Dolomite ,Biomass ,Tar ,Producer gas ,02 engineering and technology ,Raw material ,Pulp and paper industry ,CO2 content ,020401 chemical engineering ,Fluidized bed ,0202 electrical engineering, electronic engineering, information engineering ,0204 chemical engineering ,Syngas - Abstract
Air-gasification has emerged as preferred means of converting biomass to valuable synthesis gas (syngas). In present work, the gasification characteristics of pine sawdust were studied in a small-scale fluidized bed using calcined dolomite as in-bed material. Dolomite is characterized by higher tar conversion and H2 production during biomass gasification. Different operation conditions, equivalence ratios, reaction temperatures and dolomite contents, are studied for their influence on the gas compositions, gas yields, tar yields and higher heating values of producer gas. The results show that increasing either temperature or dolomite content enhances the tar conversion, where the latter accounts for the syngas with the lowest tar content. At 850 °C, the addition of 50 wt% dolomite can increase the gas yield from 1.48 to 1.85 Nm3/kg, and lowering the tar yield from 11.5 to 4.6 g/Nm3. Furthermore, the addition of more dolomite enhances the quality of the product gas, as indicated by increased values of the higher heating values of producer gas. Increasing the dolomite content within the 0–50% range resulted in higher H2 and CO contents, whereas the CH4 content declined. A slight change in CO2 content was observed with increasing dolomite content, which might cause by the limited carbonation. In contrast, the H2 content enhances non-linearly with the increase of dolomite content, which indicates that the catalytic activity of dolomite improves with the increase of dolomite share in the feedstock, due to the reforming of tar over dolomite. Increasing the ER from 0.14 to 0.3 elevates the gas yield, but decreases the tar yield and increases the H2 content in the product gas.
- Published
- 2021
33. The Effect of Dolomite Addictive Ratio on Torrified Cassava Rhizome in the Biomass Combustion Process
- Author
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Nat Thuchayapong and Nattawut Tharawadee
- Subjects
Radiation ,020209 energy ,Dolomite ,Biomass ,02 engineering and technology ,Condensed Matter Physics ,Pulp and paper industry ,Rhizome ,020401 chemical engineering ,Biomass combustion ,Scientific method ,0202 electrical engineering, electronic engineering, information engineering ,Environmental science ,General Materials Science ,0204 chemical engineering - Abstract
This research studies on the effect of additive (Dolomite) on Biomass powder (Cassava rhizome) which passes Torrefied process and fixed bed at 250 degrees Celsius for one hour and a half. The gasifier with up-draft type was used in this experiment. Air pressure was fixed at 0.1 Bar. The useful heat (Quseful) and Low heating valves (LHV) was investigated by using an Automatic Bomb Calorimeter. Moreover, the dolomite was varied 0, 10 and 15% by weight mixed with Cassava rhizome achieved with Torrefied process. When Low heating valves (LHV) slightly decreases from 21.96±0.22 MJ/kg to 18.15±0.50 MJ/kg, Quseful heat from the burning from gasifier sharply increase when it is mixed with dolomite from 753.34±39.18 to 1,003.97±33.49KJ respectively. The loading of dolomite has significance affecting the useful heat. The present study reveals that low heating valves (LHV) decreases and Quseful heat increase result from dolomite which gives a clean gas product and the Tar molecule can be easily broken. The CO2 gas from the combustion process was absorbed by CaO, which is the main component in dolomite. The cost of mixing 8.9% of Dolomite with Cassava rhizome is the optimum ratio for the biomass combustion process.
- Published
- 2021
34. Obtaining Granules from Waste Tannery Shavings and Mineral Additives by Wet Pulp Granulation
- Author
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Andrzej Obraniak, Katarzyna Ławińska, Andrzej Rostocki, R. Modrzewski, Tomasz Wężyk, Tomasz P. Olejnik, and Szymon Szufa
- Subjects
Gypsum ,Materials science ,Dolomite ,Pharmaceutical Science ,agglomerates ,02 engineering and technology ,010501 environmental sciences ,engineering.material ,01 natural sciences ,Calcium Sulfate ,Article ,Analytical Chemistry ,Calcium Carbonate ,lcsh:QD241-441 ,Granulation ,020401 chemical engineering ,lcsh:Organic chemistry ,Drug Discovery ,Magnesium ,0204 chemical engineering ,Physical and Theoretical Chemistry ,Particle Size ,0105 earth and related environmental sciences ,Waste Products ,Leather industry ,Minerals ,Mineral ,integumentary system ,Economies of agglomeration ,Pulp (paper) ,Organic Chemistry ,Water ,Tanning ,Pulp and paper industry ,tanning waste ,disc granulation ,shavings ,Chemistry (miscellaneous) ,Agglomerate ,engineering ,Molecular Medicine - Abstract
This paper presents the results of research on the granulation process of leather industry waste, i.e., tanning shavings. It is economically justified to granulate this waste together with mineral additives that are useful in the processes of their further processing. Unfortunately, the granulation of raw, unsorted shavings does not obtain desired results due to their unusual properties. In this study, the possibilities of agglomeration of this waste were examined by a new method consisting of the production and then the granulation of wet pulp. During granulation, no additional binding liquid is added to the granulated bed. As part of this work, the specific surface of granulated shavings, the granulometric composition of the obtained agglomerates, and their strength parameters were determined. The use of a vibrating disc granulator, the addition of a water glass solution (in the pulp), dolomite, and gypsum made it possible to obtain durable, mechanically stable granules.
- Published
- 2020
35. A single-stage anion exchange separation method for Cd isotopic analysis in geological and environmental samples by MC-ICP-MS.
- Author
-
Zhong, Qiao-Hui, Yin, Lu, Li, Jie, Feng, Yue-Xing, Shen, Neng-Ping, Peng, Bing-Yu, and Wang, Zhao-Yang
- Subjects
ENVIRONMENTAL sampling ,ISOTOPIC analysis ,DOLOMITE ,ION exchange resins ,SHALE ,IGNEOUS rocks ,COMPLEX matrices - Abstract
AG-MP-1M anion exchange resin is commonly used to separate and purify Cd from geological and environmental samples. However, a second column using anion exchange, TRU Spec, or BPHA extraction resins is also required to further purify Cd from the residual Sn for high-precision Cd isotope ratio measurements. In this study, a new and efficient single-stage separation method using AG-MP-1M (100–200 mesh) anion exchange resin was developed to separate Cd from geological and environmental samples for high-precision Cd isotope ratio measurements. Most of the Sn (>99%) is effectively stripped from the resin using a 2 M HCl + 4 M HF mixed eluent, unlike commonly used separation protocols with AG-MP-1M anion exchange resin, which only removes ∼65% of the Sn using HCl eluent. Furthermore, potential residual Sn is retained on the resin by elution of 0.04 M HCl + 2 M HF and 0.005 M HCl + 2 M HF, which allows quantitative collection of the Cd fraction (∼99.5%) without Sn tailing. The single-stage purification procedure takes advantage of the different affinities of Sn on AG-MP-1M anion exchange resin at different HCl and HF concentrations in mixed HCl + HF solutions, which allows direct and effective separation of Cd from Sn and other complex sample matrices. We used this procedure and the double-spike MC-ICP-MS method to determine the δ
114/110 CdNIST SRM 3108 values for Mn nodule, igneous rock, shale, soil, and sediment reference materials, and obtained results that agree within analytical uncertainty with the values reported in previous studies. In addition, the δ114/110 CdNIST SRM 3108 values of soil (GSS-1a), sediment (GSD-4a), and dolomite (GSR-12) standard reference materials are reported for the first time in this paper. The described purification procedure allows efficient and rapid Cd isotopic analysis in different types of geological and environmental samples. [ABSTRACT FROM AUTHOR]- Published
- 2023
- Full Text
- View/download PDF
36. Syngas production from air-steam gasification of biomass with natural catalysts
- Author
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Tian Ye, Ji Xuanyu, Bai Jisong, Xiong Zhou, Shunhong Lin, and Ming Xu
- Subjects
Environmental Engineering ,Wood gas generator ,business.industry ,020209 energy ,Dolomite ,Tar ,Biomass ,02 engineering and technology ,Pulp and paper industry ,Pollution ,Natural gas ,Fluidized bed ,0202 electrical engineering, electronic engineering, information engineering ,Environmental Chemistry ,Environmental science ,Coal ,business ,Waste Management and Disposal ,Syngas - Abstract
Biomass has a great potential for production of syngas and chemicals; however, it has stood in the shadow of natural gas (NG) and coal due to technical problems and issues such as tar formation. In this paper, syngas production from catalytic air–steam gasification of biomass in a fluidized bed was investigated. To enhance the yield of produced syngas and reduce its tar content by cracking, limestone, calcined dolomite, and olivine were used as catalyst. The maximum mole fraction of H2 was found to be 49.1 vol% at 1000 °C and a steam/biomass ratio (S/B) of 1.0 with dolomite present. Compared to olivine and dolomite, calcined dolomite was proved to be more effective for gas production and tar destruction. The results also showed that the particle size has a weak influence on gasifier performance, with only a slight decrease in tar content with decreasing biomass particle size.
- Published
- 2018
37. Biochar production and characterization as a measure for effective rapeseed residue and rice straw management: an integrated spectroscopic examination
- Author
-
Imran Khan, Abdus Salam, Hongqing Hu, and Saqib Bashir
- Subjects
Rapeseed ,Renewable Energy, Sustainability and the Environment ,Sylvite ,Chemistry ,Environmental remediation ,020209 energy ,Dolomite ,02 engineering and technology ,010501 environmental sciences ,engineering.material ,Raw material ,Pulp and paper industry ,01 natural sciences ,Biochar ,0202 electrical engineering, electronic engineering, information engineering ,engineering ,Titration ,Pyrolysis ,0105 earth and related environmental sciences - Abstract
Producing biochar from various agricultural and industrial biowastes through pyrolysis is recognized as an eco-friendly approach for solid waste management and remediation of contaminated soils. However, it remains debatable which type of feedstock and pyrolysis temperature could create biochar with better surface functionality and more suitable specific end use. Biochars prepared from rapeseed residue and rice straw at different pyrolysis temperatures (300 and 550 °C) were characterized using various chemical, physical, and spectroscopic techniques. Rapeseed residue and rice straw biochars produced at 550 °C had high pH (9.98 and 10.85, respectively), due to the decrease in total surface acidity with increasing temperature as demonstrated by Boehm titration data, and their high ash contents (18.70% and 24.21%, respectively). The negative charge on high-temperature biochar particles increased with pH, which was confirmed by the reduced zeta potential values (− 42.33 mV for rice straw biochar and − 31.86 mV for rapeseed residue biochar). The mineral phase of both biochars was dominated by sylvite and a small amount of dolomite and calcite, whereas quartz was only found in rice straw biochars. A pyrolysis temperature of 550 °C is suggested for producing biochars that can potentially immobilize toxic elements in the soil.
- Published
- 2020
38. CaO/Natural Dolomite as a Heterogeneous Catalyst for Biodiesel Production
- Author
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Atik Dian Nafiah, Indah Suci Fauziah, Hirofumi Hinode, Winarto Kurniawan, Bachrun Sutrisno, and Arif Hidayat
- Subjects
Biodiesel ,Materials science ,food.ingredient ,Mechanical Engineering ,Dolomite ,Coconut oil ,0211 other engineering and technologies ,02 engineering and technology ,Transesterification ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,Pulp and paper industry ,Heterogeneous catalysis ,Catalysis ,food ,Mechanics of Materials ,Biodiesel production ,General Materials Science ,021108 energy ,0210 nano-technology - Abstract
In the present study, the CaO/Natural Dolomite as a heterogeneous catalyst was applied to synthesize biodiesel from coconut oil. The physico-characteristics of CaO/Natural Dolomite catalyst were determined using X-ray diffraction (XRD), X-Ray Fluorescence, and porosity analysis (specific surface area, average pore size diameter and total pore volume). The performance of CaO/Natural Dolomite catalyst was examined in a batch reactor for transesterification reaction of coconut oil with methanol. From the experiments, the optimum process conditions were achieved at a 60°C of reaction temperature, a 5 wt.% of catalyst amount, and 6 : 1 of methanol to coconut oil mass ratio. The CaO/Natural Dolomite catalyst exhibits high catalytic activity and reliable to be applied in biodiesel synthesis as a heterogeneous base catalyst.
- Published
- 2020
39. Performance evaluation of natural catalysts during the thermochemical conversion of poultry litter
- Author
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Christian Manera, Daniele Perondi, Ademir J. Zattera, and Marcelo Godinho
- Subjects
021110 strategic, defence & security studies ,Environmental Engineering ,Chemistry ,General Chemical Engineering ,Dolomite ,0211 other engineering and technologies ,Tar ,02 engineering and technology ,010501 environmental sciences ,Pulp and paper industry ,01 natural sciences ,law.invention ,Catalysis ,Cracking ,chemistry.chemical_compound ,law ,Carbon dioxide ,Environmental Chemistry ,Calcination ,Safety, Risk, Reliability and Quality ,Pyrolysis ,Poultry litter ,0105 earth and related environmental sciences - Abstract
The thermochemical conversion may be an alternative for the final destination of poultry litter wastes. In this study, the effect of calcined eggshell (CE) and calcined dolomite (CD) on slow pyrolysis and air gasification performance of poultry litter waste was evaluated. The catalysts (CE and CD) presented potential for use in the in situ capture of the carbon dioxide produced in the pyrolysis process. In relation to the gasification tests, it can be concluded that both catalysts were effective in cracking the produced tar. Reductions in gas tar concentration of 25.47 and 54.32% were observed for CE and CD, respectively. The catalysts are effective at cracking light hydrocarbons (
- Published
- 2019
40. Ocean acidification does not affect magnesium composition or dolomite formation in living crustose coralline algae, Porolithon onkodes in an experimental system.
- Author
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Nash, M. C., Uthicke, S., Negri, A. P., and Cantin, N. E.
- Subjects
OCEAN acidification ,DOLOMITE ,CORALLINE algae ,OGCODES ,CORALS ,DISSOLUTION (Chemistry) - Abstract
There are concerns that Mg-calcite crustose coralline algae (CCA), which are key reef builders on coral reefs, will be most susceptible to increased rates of dissolution under higher pCO
2 and ocean acidification. Due to the higher solubility of Mg-calcite, it has been hypothesized that magnesium concentrations in CCA Mg-calcite will decrease as the ocean acidifies, and that this decrease will make their skeletons more chemically stable. In addition to Mg-calcite, CCA Porolithon onkodes the predominant encrusting species on tropical reefs, can have dolomite (Ca0.5 Mg0.5 CO3 ) infilling cell spaces which increases their stability. However, nothing is known about how bio-mineralised dolomite formation responds to higher pCO2. Using P. onkodes grown for 3 and 6 months in tank experiments, we aimed to determine (1) if mol%MgCO3 in new crust and new settlement affected by increasing pCO2 levels (365, 444, 676 and 904 ppm), (2) whether bio-mineralised dolomite formed within these time frames, and (3) if so, whether this was effected by pCO2 . Our results show there was no significant effect of pCO2 on mol%MgCO3 in any sample set, indicating an absence of a plastic response under a wide range of experimental conditions. Dolomite within the CCA cells formed within 3 months and dolomite abundance did not vary significantly with pCO2 treatment. While evidence mounts that climate change will impact many sensitive coral and CCA species, the results from this study indicate that reef-building P. onkodes will continue to form stabilising dolomite infill under near-future acidification conditions, thereby re- taining its higher resistance to dissolution. [ABSTRACT FROM AUTHOR]- Published
- 2015
- Full Text
- View/download PDF
41. Bio-oil and char obtained from cassava rhizomes with soil conditioners by fast pyrolysis
- Author
-
Monchawan Wangkulangkool, Koson Rueangsan, Homhuan Tasarod, Pakkip Kraisoda, Somsuk Trisupakitti, Adcha Heman, and John Morris
- Subjects
Soil conditioners ,H1-99 ,Cassava rhizome ,Multidisciplinary ,Science (General) ,Chemistry ,Dolomite ,Bio-oil ,Pulp and paper industry ,Rhizome ,Catalysis ,Soil conditioner ,Free-fall reactor ,Social sciences (General) ,Q1-390 ,Heat of combustion ,Char ,Organic fertilizer ,Pyrolysis ,Fast pyrolysis ,Research Article - Abstract
We studied the properties of the bio-oil and char from fast pyrolysis of cassava rhizomes in a free-fall reactor, catalyzed by adding various soil conditioners (or improvers) as catalysts to the reactor at 500 °C and 200 g/h feed rate. Four conditioners were evaluated - granular TPI pH11 soil conditioner, volcanic rock, TPI pelletized organic fertilizer and super dolomite - and added at 50% (w/w) of the rhizomes. Bio-oil and gas yields decreased, whereas char yields increased, yielding bio-oil 57–59%, gas 14–20% and char 23–28%. With the catalysts, the bio-oil higher heating value increased, while that of char decreased: for cassava rhizomes with volcanic rock the bio-oil high heating value increased from 19.4 to 23.6 MJ/kg, whereas rhizomes with dolomite led to an increased viscosity from 27 to 34 × 10−3 mm2/s., Fast pyrolysis; Free-fall reactor; Bio-oil; Cassava rhizome; Soil conditioners.
- Published
- 2021
42. Sedimentary characteristics, lithofacies, and paleogeography of the Middle–Lower Cambrian in the Tarim Basin, NW China.
- Author
-
Ji, Tianyu, Yang, Wei, Wu, Xueqiong, Li, Dejiang, Liu, Mancang, Song, Chengpeng, and Chen, Xi
- Subjects
PALEOGEOGRAPHY ,LITHOFACIES ,CONTINENTAL shelf ,SEDIMENTARY facies (Geology) ,FACIES ,DOLOMITE ,SEDIMENTS - Abstract
The Cambrian pre-salt dolomite sequence in the Tarim Basin is a target zone of great strategic significance for hydrocarbon exploration in the basin. Using the results of the interpretation of 3D seismic data from Lunnan and 2D seismic data covering the whole basin, and based on a synthesis of outcrop data, drilling data, well logs, core data, and thin-section data, and the findings from previous studies, this paper studies the characteristics of the facies of the Middle–Lower Cambrian in the platform area in the Tarim Basin, the formation and evolution of platform margins, and the sedimentary characteristics, lithofacies, and paleogeographic characteristics of the Middle–Lower Cambrian series. Based on the types of lithofacies and the seismic facies analysis, the sedimentary facies of the Middle–Lower Cambrian strata can be classified into the five types. From bottom to top, the Middle–Lower Cambrian have experienced several development stages, including the deposition of continental shelf sediments of the Yuertusi Formation, gently sloping non-rimmed platform margin sediments of the Xiaoerbulake Formation, weakly rimmed platform margin sediments of the Wusongger and Shayilike formations, and strongly rimmed platform margin sediments of the Awatage Formation. In each stage, the platform margin shifted further east relative to its location in the previous stage. Based on these results and previous studies, the lithofacies and paleogeography maps of the Middle–Lower Cambrian in the Tarim Basin are modified, and the implications for hydrocarbon exploration in this area are discussed. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
43. UTJECAJ MATIČNOG SUPSTRATA NA ZNAČAJKE KALKOKAMBISOLA NA PODRUČJU NP PLITVIČKA JEZERA.
- Author
-
PERKOVIĆ, Ivan, POČEKAL, David, ROJE, Vibor, BAKŠIĆ, Darko, and PERNAR, Nikola
- Abstract
Copyright of Journal of Forestry Society of Croatia / Sumarski List Hrvatskoga Sumarskoga Drustva is the property of Forestry Society of Croatia and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2024
- Full Text
- View/download PDF
44. Analysis of limestones and dolomites by x-ray fluorescence spectroscopy
- Author
-
Wheeler, B
- Published
- 1999
45. Comments on the paper of . Journal of African Earth Sciences, 58, pp. 489–506.
- Author
-
Tlig, Saïd
- Subjects
- *
STRATIGRAPHIC geology , *FOSSILS , *PLATE tectonics , *CARCHARODONTOSAURUS , *DOLOMITE - Published
- 2016
- Full Text
- View/download PDF
46. CO2 gasification of biomass: The effect of lime concentration in a fluidised bed
- Author
-
Zdeněk Beňo, Siarhei Skoblia, Michael Pohořelý, Michal Jeremiáš, Karel Svoboda, and Michal Šyc
- Subjects
Wood gas generator ,020209 energy ,Mechanical Engineering ,Dolomite ,Tar ,Biomass ,02 engineering and technology ,Building and Construction ,Management, Monitoring, Policy and Law ,engineering.material ,Pulp and paper industry ,law.invention ,chemistry.chemical_compound ,General Energy ,chemistry ,law ,Carbon dioxide ,0202 electrical engineering, electronic engineering, information engineering ,engineering ,Carbonate ,Calcination ,Lime - Abstract
Fluidised bed (FB) technology can be advantageously used for the gasification of solid fuels. Calcined carbonate materials, such as limestone or dolomite, can be used directly in the fluidised bed of the gasification reactor to reform tars in situ and to enhance carbon conversion and cold gas efficiency of the gasification process. However, they exhibit poorer mechanical stability, they tend to be attrited and carried over from the reactor, and their catalytic activity decreases over time. Therefore, a portion of the material has to be replenished continuously or periodically. To decrease the amount of carbonate material that has to be replenished, a lower amount of lime (calcined limestone or dolomite) can be used in the FB, diluted by a mechanically robust material, such as silica sand or olivine. According to the literature, even concentrations in the order of 10–35% wt. of carbonate material in the FB of silica sand have a substantial effect on the decomposition of tars during steam or air gasification. However, the effect of the concentration of lime in the FB has not yet been described for CO2 gasification. In this paper, we focus on the effect of the ratio of calcined dolomitic limestone and silica sand in the FB (0%, 25%, 50% and 100% vol. of dolomitic limestone) for CO2+O2 gasification of biomass and compare it with H2O+O2 gasification at the temperature of 850 °C. The experiments were performed in a semi-autothermal spouting FB reactor, gasifying 1.4 kg h−1 of woody biomass. The effects of the concentration of dolomitic lime in the fluidised bed differed for H2O+O2 and CO2+O2 gasification. When gasifying with H2O+O2, optimal results were found with 50% vol. (35% wt.) lime in the FB, when the yield of tar was similar to the use of pure lime in the FB. When gasifying with CO2+O2, a substantial decrease in tar yield was observed when using 50% vol. (35% wt.) lime in the FB (compared to the use of pure silica sand); nevertheless, the use of undiluted lime in the FB remains the best option to attain minimal tar yield when gasifying with a CO2+O2 gasifying agent. In this case, the tar yield was decreased 8.7-fold, and the tar dew point was decreased by 124 °C (to 71 °C) compared to the non-catalysed case with silica sand being the fluidised bed of the gasifier.
- Published
- 2018
47. Evaluation and comparison of various methods used for aggregates investigations
- Author
-
Hołysz, Lucyna, Rek, Paulina, Huber, Miłosz, and Terpiłowski, Konrad
- Published
- 2024
- Full Text
- View/download PDF
48. Behaviour of primary catalysts in the biomass steam gasification in a fountain confined spouted bed
- Author
-
Jon Alvarez, Gartzen Lopez, Maider Amutio, Maria Cortazar, Javier Bilbao, and Martin Olazar
- Subjects
Inert ,Materials science ,020209 energy ,General Chemical Engineering ,Organic Chemistry ,Dolomite ,Energy Engineering and Power Technology ,chemistry.chemical_element ,Tar ,02 engineering and technology ,Pulp and paper industry ,Catalysis ,Cracking ,Fuel Technology ,020401 chemical engineering ,chemistry ,visual_art ,Yield (chemistry) ,0202 electrical engineering, electronic engineering, information engineering ,visual_art.visual_art_medium ,Sawdust ,0204 chemical engineering ,Carbon - Abstract
The performances of the primary catalysts olivine, dolomite, γ-alumina and FCC spent catalyst were evaluated in the continuous steam gasification of sawdust in a bench-scale plant equipped with a fountain confined conical spouted bed reactor. The experiments were carried out at 850 °C, and the efficiency of the gasification process was defined by gas yield, H2 production, tar concentration and composition, and carbon conversion efficiency. The benefits of the fountain confiner not only helped to improve the gas-solid contact, and therefore favoured the primary catalysts’ reforming and cracking activity, but also enhanced H2 production and reduce tar formation. Thus, dolomite and γ-alumina recorded the lowest values of tar, 5.0 and 6.7 g Nm−3, respectively, which corresponded to 79% and 72% tar reduction compared to the inert sand, whereas olivine and the FCC spent catalyst recorded higher tar contents, 20.6 and 16.2 g Nm−3, respectively. It is noteworthy that light PAHs were the most abundant species in the tar (60 wt% of the whole tar content).
- Published
- 2019
49. Utilization of Large-Sized Dolomite By-Product Particles and Losses of Cations from Acidic Soil
- Author
-
Vladimir M. Bure, Ivan Salaev, Elmira Saljnikov, Anton Lavrishchev, Olga Pavlova, and Andrey Litvinovich
- Subjects
2. Zero hunger ,0106 biological sciences ,Chemistry ,fungi ,Dolomite ,food and beverages ,Soil Science ,04 agricultural and veterinary sciences ,Pulp and paper industry ,01 natural sciences ,Soil pH ,Biomass yield ,040103 agronomy & agriculture ,By-product ,High doses ,0401 agriculture, forestry, and fisheries ,Agronomy and Crop Science ,Dissolution ,Large size ,010606 plant biology & botany - Abstract
To investigate the possibilities of utilization of dolomite large size fractions (dropouts) and their effect on plants a five-year experiment was set in 2015. A fertilization value of large fractions (5–7 and 7–10 mm) of dolomite in two doses was studied. The biomass yield of crops in dolomite dropout treatment was around 90% from the treatment using dolomite flour (control). Losses of bases from the soil treated with high doses of dropouts did not exceed the migration losses of the treatment with dolomite flour. Dynamics of dolomite flour dissolution in the soil was empirically modeled. The data prove that high doses of the large-sized dolomite fractions act similarly to standard dolomite flour and have more persistent effects on soil and plants.
- Published
- 2019
50. Impact of flotation hydrodynamics on the optimization of fine-grained carbonaceous sedimentary apatite ore beneficiation
- Author
-
Urs A. Peuker, Ahmad Hassanzadeh, Duong Huu Hoang, and Martin Rudolph
- Subjects
Mineral ,Materials science ,General Chemical Engineering ,Pulp (paper) ,Bubble ,Metallurgy ,Dolomite ,Beneficiation ,02 engineering and technology ,engineering.material ,021001 nanoscience & nanotechnology ,Apatite ,Volumetric flow rate ,020401 chemical engineering ,visual_art ,engineering ,visual_art.visual_art_medium ,0204 chemical engineering ,Inductively coupled plasma ,0210 nano-technology - Abstract
The flotation beneficiation of phosphate ore is increasingly facing challenges, especially for finely disseminated sedimentary ores rich in carbonates. This study aims to optimize and assess the impact of key hydrodynamic parameters including pulp density, air flowrate and impeller speed on flotation and metallurgical responses (i.e. grade, recovery, flotation rate constant and selectivity index (SI)). We carried out locked cycle flotation tests using the best conditions from the rougher flotation test to generate an experimental simulation of a continuous circuit. The mineralogical and chemical properties were characterized by mineral liberation analysis (MLA) and inductively coupled plasma optical emission spectroscopy (ICP-OES) techniques, respectively. A modified-McGill bubble size viewer was used for measuring bubble sizes and evaluating the interaction between hydrodynamic factors and bubble diameters. Finally, the design of experiment (DOE) method was applied to determine the relative intensity of the studied factors. It was found that under optimal conditions with the targets of high recovery and maximum SI, the final apatite concentrate achieved a recovery of 86.3% at a grade of 35.5%, while the MgO content was 1.2% and 84.3% of dolomite was removed from a feed ore containing about 25% P2O5, 4.6% MgO, and 41% CaO. Furthermore, another locked cycle flotation test showed that a 0.82% MgO content in the final apatite concentrate can be achieved with an apatite recovery of 75.6% at a P2O5 grade of 36.76% , and a ratio CaO/P2O5 = 1.33. The obtained concentrate in this investigation under the optimum conditions is the highest in both apatite recovery and grade with low MgO content reported in the literature.
- Published
- 2019
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