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943 results on '"Hu, Yuehua"'

161. Acidithiobacillus ferrooxidans enhanced heavy metals immobilization efficiency in acidic aqueous system through bio-mediated coprecipitation

Author

Xinxing Liu, Guanzhou Qiu, Gan Min, Jian Zeng, Hu Yuehua, Ming-ming Li, and Jianyu Zhu

Subjects
Aqueous solution, Coprecipitation, Chemistry, Schwertmannite, Metallurgy, Metals and Alloys, 02 engineering and technology, 010501 environmental sciences, engineering.material, 021001 nanoscience & nanotechnology, Geotechnical Engineering and Engineering Geology, Condensed Matter Physics, 01 natural sciences, law.invention, Ferrous, Wastewater, law, Anglesite, Jarosite, Materials Chemistry, engineering, Crystallization, 0210 nano-technology, 0105 earth and related environmental sciences, Nuclear chemistry
Abstract

This study investigated the promotion effect of A. ferrooxidans on complex heavy metals coprecipitation process. A. ferrooxidans significantly enhanced the ferrous oxidation, which also promoted the formation of iron-oxyhydroxysulphate. Cu(II) concentration reduced to 0.058 mmol/L in A. ferrooxidans inoculated system, and Cd also reduced to the lowest concentration (0.085 mmol/L). Pb was mainly immobilized as anglesite and iron-oxyhydroxysulphate promoted the removal of remanent Pb in solution. The precipitates are characterized by XRD, SEM, and FTIR analysis. The main component of the iron-oxyhydroxysulphate was well crystallized jarosite. A. ferrooxidans contributed to the formation of schwertmannite in later monovalent cation lack stage. Higher ferrous iron oxidation rate and Fe(III) supply rate in A. ferrooxidans inoculated system facilitated polyhedron crystal formation and the increase of particle diameter. Complex heavy metals could be incorporated into iron oxyhydroxysulphate crystal, and efficiently removed from acidic wastewater through A. ferrooxidans mediated coprecipitation.

Published
2017

165. Effect and mechanism of octanol in cassiterite flotation using benzohydroxamic acid as collector

Author

Lei Sun, Wei Sun, and Hu Yuehua

Subjects
Octanol, Chemistry, Inorganic chemistry, Cassiterite, Metals and Alloys, Infrared spectroscopy, 02 engineering and technology, engineering.material, Geotechnical Engineering and Engineering Geology, Condensed Matter Physics, 020501 mining & metallurgy, chemistry.chemical_compound, Adsorption, 0205 materials engineering, Benzohydroxamic acid, Materials Chemistry, engineering, Ph range
Abstract

The effect of octanol in cassiterite flotation using benzohydroxamic acid (BHA) as a collector was investigated. The adsorption mechanism of octanol and BHA on the surface of cassiterite was analyzed by adsorption experiments and infrared spectra analysis. Micro-flotation results indicated that single octanol exhibited almost no collecting power to cassiterite over a wide pH range. However, as an auxiliary collector, octanol could markedly decrease the consumption of collector BHA and keep the recovery of cassiterite in high level. The results of adsorption experiments and infrared spectra demonstrated that single octanol was not adsorbed on the surface of cassiterite. It formed adsorption connected with BHA on the surface of cassiterite, and enhanced the hydrophobicity of cassiterite. Octanol promoted the adsorption amount of BHA on the cassiterite surface, and decreased the consumption of BHA.

Published
2016

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