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The demand for Critical Raw Materials (CRM) is increasing due to the need to decarbonize economies and transition to a sustainable low-carbon future achieving climate goals. To address this, the European Union is investing in the discovery of new mineral deposits within its territory. The S34I project (Secure and Sustainable Supply of Raw Materials for EU Industry) is developing Earth observation (EO) methods to support this goal. This study compares the performance of two satellites, Sentinel-2 and Landsat-9, for mineral exploration in two geologically distinct areas in northern Spain. The first area, Ria de Vigo, contains marine placer deposits of heavy minerals, while the second, Aramo, hosts Co-Ni epithermal deposits. These sites provide exceptional case studies to improve EO-based methods for CRM exploration onshore and coastal regions, focusing on deposits often overlooked in remote sensing studies. Standard remote sensing methods such as RGB combinations, Principal Component Analysis (PCA), and band ratios were adapted and compared for both satellites. The results showed similar performance in the Ria de Vigo area, but Sentinel-2 performed better in Aramo, identifying a higher number of zones of mineral alterations. The study highlights the advantages of Sentinel-2's higher spatial resolution, especially for mapping smaller or more scattered mineral deposits. These findings suggest that Sentinel-2 could play a larger role in mineral exploration. This research provides valuable insights into using EO data for diverse CRM deposits. [ABSTRACT FROM AUTHOR]

Feldspars are essential components in the ceramic industry, and the increasing demand for high-grade fluxes has recently elevated their status as critical raw materials for the European Union. This survey aims to evaluate, for the first time, Italy's mining potential for the production of ceramic fluxes through a methodological approach that considers lithology, technological value, degree of alteration and potential for mining exploitation. The most promising resources are identified in the Alps, the Apennines, Sardinia and the Calabro–Peloritan Arc, based on the chemical composition of rocks without any beneficiation. Key parameters include the equivalent feldspar content and the sum of Fe2O3 + TiO2. Factors that may influence the feasibility of exploitation are critically discussed for granitoids and syenites, acidic volcanics, aplites and pegmatites, albitites, felsic metamorphics, silica-saturated and silica-undersaturated volcanics, arkosic sandstones and rocks that have undergone epithermal alteration. All resources are compared with deposits currently under extraction and assessed against benchmarks or well-recognized raw materials used as market proxies. This review lays the groundwork for operational mining exploration by clearly defining Italy's potential for feldspathic fluxes. The exploratory assessment approach to feldspathic resources can also be applied in other countries. [ABSTRACT FROM AUTHOR]

This study examines the chemical and mineralogical composition of waste materials from abandoned copper and manganese mines in the Iberian Pyrite Belt, Portugal, as a first step toward their potential recycling for critical and strategic raw materials (CRM and SRM). Using portable X-ray fluorescence (pXRF) and other analytical techniques, this research highlights the presence of valuable elements, including copper, manganese, and rare earth elements, in concentrations significantly above their crustal abundance. The findings underscore the dual potential of these wastes: as sources of secondary raw materials and for mitigating environmental hazards such as acid mine drainage (AMD). Recovered materials include chalcopyrite, pyrolusite, and rhodochrosite, with critical elements like cobalt, lithium, and tungsten identified. pXRF proved to be a reliable, cost-effective tool for rapid field and laboratory analyses, demonstrating high precision and good correlation with standard laboratory methods. The study emphasizes the importance of characterizing historical mining waste to support a circular economy, reduce reliance on foreign material imports, and address environmental challenges. This approach aligns with the European Union's Critical Raw Materials Act, promoting sustainable resource use and the recovery of strategic resources from historical mining sites. [ABSTRACT FROM AUTHOR]

Climate change is leading modern society to seek innovative solutions for sustainable development and a zero-carbon economy. Nevertheless, new technologies strongly rely on precious raw materials and might suffer from supply chain risks. The European Union has identified a set of raw materials deemed to be critical or strategic because they appear essential for energy transition technologies. Consequently, long-term energy system planning must factor in the availability of these critical raw materials when selecting specific technologies, as their supply could be affected by global policies or conflicts. This paper provides a literature review on the assessment of critical raw materials in energy technologies comparing the main approaches on critical raw materials content assessment in technologies, long-term planning studies considering critical raw materials, and the development of indicators for critical raw materials content in energy technologies. The main findings of this review suggest that existing reliable databases with the bill of materials, such as life cycle inventories, should be exploited and that proper indicators to rank the criticality of materials and the importance of a specific technology should be developed. These findings are discussed and organized proposing a method for the optimal planning of an energy technologies mix in regional or national energy systems considering the availability and future supply of critical raw materials. [ABSTRACT FROM AUTHOR]

Mining projects are intricate, requiring significant time and investment for feasibility studies, despite a low likelihood of reaching execution. Accurate project factors can optimize costs across the study, execution, and operation phases. This work proposes a strategic approach to define the production rate in conceptual projects of critical raw materials, based on well-established formulae from Taylor, Long, and Singer, focusing on copper, zinc, and lead. Copper and zinc are crucial for renewable energy systems and low-carbon technologies, while lead supports energy storage applications. A dataset containing mine production and mineral resources from several mine projects, gathered from a specialized global company, was used to create a production rate equation and then compared using an adherence indicator to validate the formulae. The best adherence indicator from earlier studies was 59%. Copper projects did not show good adherence to the new formulae. Zinc and lead projects showed very good results, generating three formulae with good adherence numbers (above 70%), and they can be taken as a reference to calculate the production rate of new open-pit and underground mining projects. These findings offer a reliable strategic approach for estimating production rates in early-stage zinc and lead projects, enhancing the efficiency of the conceptual study phase in mining. [ABSTRACT FROM AUTHOR]

In the debate on international waste trade, the focus on resource efficiency and recycling has gradually begun to accompany the focus on negative environmental externalities. In this context, we examine the impact of extended producer responsibility (EPR) on the export of waste batteries (WB). EPR is considered as a key policy for the "marketization of waste". WB are a hazardous waste that also contain a high concentration of critical raw materials. As such, they are of strategic importance for the recovery of critical resources, while at the same time requiring proper environmental management. Therefore, it is crucial to understand where WB are treated and how this is affected by related policies. Our results, based on difference-in-difference models in a gravity framework, show a consistent increase in WB exports after EPR implementation compared to the trend for other wastes. This result is likely to be an indirect consequence of the ability of EPR to support growth in waste collection rates, more accurate tracking of transboundary waste flows, and specialization of national waste management systems. In particular, WB exports appear to be directed to countries with more advanced waste management systems, more stringent environmental regulations, and limited endowments of the mineral resources typically contained in batteries. [ABSTRACT FROM AUTHOR]

The United Nations (UN) strives for critical raw materials(CRMs) via sustainable development goals(SDGs). The growing population and pollution have thrusted the demand for critical materials for progressive science and technology and stunted overall economic growth worldwide. The current linear economy relies on a take-make-dispose policy. This approach extracts, uses and depletes CRMs which leads to ecological imbalance. Waste has become a major challenge for the sustainability of planet. Concerning to achieving UN sustainable development goals, the global mandate is to replace the outdated linear economy, this change is important for addressing material criticality and it can be possible because of the pillars of SDGs (Circular economy, 5Rs' and Green-organic domain). At the start of this millennium, the world underwent economic transition. It moved from linear-circular and brown-green. This universal movements aim for Zero-Waste living. Consequently, 5R's concept, i.e., Rethink, Refuse, Reduce, Reuse and Recycle, is an aptly irresistible weapon for combating ever-increasing waste/pollution for sustainable growth. In this regard, green organic principles are considered to stride to a circular and green economic perspective for better use of CRMs. The pillars of SDGs prevent potential destructive impacts on the environment and human health. They promote green-organic domain practices to obtain a more sustainable economy, addition to boosting quality of life by harmonizing disturbed climate change. [ABSTRACT FROM AUTHOR]

Solid oxide fuel cells (SOFCs) and solid oxide electrolyzer cells (SOECs) represent a promising clean energy solution. In the case of SOFCs, they offer efficiency and minimal to zero CO2 emissions when used to convert chemical energy into electricity. When SOFC systems are operated in regenerative mode for water electrolysis, the SOFCs become solid oxide electrolyzer cells (SOECs). The problem with these systems is the supply and availability of raw materials for SOFC and SOEC components. This raises significant economic challenges and has an impact on the price and scalability of these technologies. Recycling the materials that make up these systems can alleviate these economic challenges by reducing dependence on the supply of raw materials and reducing overall costs. From this point of view, this work is a perspective analysis and examines the current research on the recycling of SOFC and SOEC materials, highlighting the potential paths towards a circular economy. The existing literature on different approaches to recycling the key materials for components of SOFCs and SOECs is important. Mechanical separation techniques to isolate these components, along with potential strategies like chemical leaching or hydrometallurgical and material characterization, to ensure the quality of recycled materials for reuse in new SOFCs and SOECs are important as well. By evaluating the efficiency of various methods and the quality of recovered materials, this study aims to provide valuable insights for advancing sustainable and economically viable SOFC and SOEC technologies within a net-zero economic framework. [ABSTRACT FROM AUTHOR]

This study addresses the environmental challenges associated with high-performance rare-earth magnets, particularly NdFeB, which are essential in green and digital technologies. By employing Life Cycle Assessment (LCA) with openLCA software, we evaluate the environmental impacts across the life cycles of ferrite, NdFeB, and MnAlC magnets, focusing on extraction, processing, and recycling. Various studies have explored different aspects of the LCA of NdFeB magnets, focusing on production methods, recycling processes, and the environmental impacts of different rare-earth sources. A comparative LCA highlights the significant environmental footprint of rare-earth magnets, underscoring the role of functional unit selection: when assessed per unit of energy density, the environmental impact of NdFeB magnets aligns more closely with alternatives. Methodological issues such as data quality, choice of functional units, and system complexity affect LCA accuracy, as inconsistencies in data or scope led to potential distortions in environmental assessments. This research also explores manganese-based magnets as viable alternatives to reduce reliance on rare-earth materials. Legislative initiatives, including the EU's Ecodesign Directive and Critical Raw Materials Act, support sustainable management practices to ensure reliable material supply while promoting environmental protection. This paper highlights the importance of sustainable magnetic materials, emphasizing the need for interdisciplinary research to balance technological efficiency and environmental impact, especially as rare-earth magnet demand rises with the transition to renewable energy sources. [ABSTRACT FROM AUTHOR]

Dredged material is a common environmental and economic issue worldwide. Tons of highly contaminated material, derived from cleaning the bottoms of bays and harbours, are stored until depuration. These volumes occupy huge extensions and require costly treatments. The Ria of Huelva (southwest Spain) receives additionally high metal contamination inputs from the Odiel and Tinto Rivers which are strongly affected by acid mine drainage (acid lixiviates with high metal content and sulphates). These two circumstances convert the port of Huelva into an acceptor/accumulator of contamination. The current study proposes an alternative active treatment of dredged material and mining residues using ASEC (Adiabatic Sonic Evaporation and Crystallization) technology to obtain distilled water and valuable solid conglomerates. Different samples were depurated and the efficiency of the technology was tested. The results show a complete recovery of the treated volumes with high-quality water (pH~7, EC < 56 µS/cm, complete removal of dissolved elements). Also, the characterization of the dried solids enable the calculation of approximate revenues from the valorization of some potentially exploitable elements (Rio Tinto: 4 M, Tharsis: 3.7 M, dredged material: 2.5 M USD/yr). The avoidance of residue discharge plus the aggregated value would promote a circular economy in sectors such as mining and dredging activities. [ABSTRACT FROM AUTHOR]

This paper presents a comprehensive optimization strategy for the synthesis of new black ceramic pigments with low cobalt content while maintaining a single-phase spinel structure. The aim is to achieve comparable hues to those of an industrial benchmark containing five transition metals while minimizing the environmental impact. Exploring all possible compositions deriving from a five–component system (Cr, Mn, Fe, Co and Ni), through traditional methods would be extremely time consuming to guarantee an efficient sampling, requiring high experimental efforts. Hence, to identify the best black compositions, we employed a chemometric approach, the Design of Experiments, aiming to investigate the compositional domain derived by varying the metals stoichiometry within fixed boundaries to identify optimal pigment compositions. The resulting pigments (comprising Cr, Fe and Co), despite the lower cobalt content, exhibited optimal colorimetric properties comparable to the standard benchmark, with experimental Δ E values comparable to the ones predicted by the model. In particular, the pure spinels Cr 1.05 Fe 1.05 Co 0.9 O 4 and Cr 1.2 Fe 1.05 Co 0.75 O 4 displayed low lightness and chroma (L∗ = 2.4; C∗ = 5 and L∗ = 1.12; C∗ = 1.1, respectively), providing deep and dark black tonality. These compositions exhibit promising colorimetric performance and chemical stability, offering potential benefits for industrial applications. [ABSTRACT FROM AUTHOR]

Background: To limit climate change and reduce further harmful environmental impacts, the reduction and substitution of fossil energy carriers will be the main challenges of the next few decades. During the United Nations Climate Change Conference (COP28), the participants agreed on the beginning of the end of the fossil fuel era. Hydrogen, when produced from renewable energy, can be a substitute for fossil fuel carriers and enable the storage of renewable energy, which could lead to a post-fossil energy age. This paper outlines the environmental impacts and levelized costs of hydrogen production during the life cycle of water electrolysis technologies. Results: The environmental impacts and life cycle costs associated with hydrogen production will significantly decrease in the long term (until 2045). For the case of Germany, the worst-case climate change results for 2022 were 27.5 kg CO2eq./kg H2. Considering technological improvements, electrolysis operation with wind power and a clean heat source, a reduction to 1.33 kg CO2eq./kg H2 can be achieved by 2045 in the best case. The electricity demand of electrolysis technologies is the main contributor to environmental impacts and levelized costs in most of the considered cases. Conclusions: A unique combination of possible technological, environmental, and economic developments in the production of green hydrogen up to the year 2045 was presented. Based on a comprehensive literature review, several research gaps, such as a combined comparison of all three technologies by LCA and LCC, were identified, and research questions were posed and answered. Consequently, prospective research should not be limited to one type of water electrolysis but should be carried out with an openness to all three technologies. Furthermore, it has been shown that data from the literature for the LCA and LCC of water electrolysis technologies differ considerably in some cases. Therefore, extensive research into material inventories for plant construction and into the energy and mass balances of plant operation are needed for a corresponding analysis to be conducted. Even for today's plants, the availability and transparency of the literature data remain low and must be expanded. [ABSTRACT FROM AUTHOR]

Critical raw materials (CRMs) represent essential resources for several strategic sectors in the European Union and strategies are necessary to reduce dependence on imports and improve the efficiency of their use. The European Union is facing significant challenges in diversifying supply chains, implementing effective sustainability standards, and reducing strategic dependencies on imports. Our study investigates the impact of critical raw material (CRM) imports on the competitiveness of the European market, addressing significant gaps in the existing literature regarding this relationship. Utilizing quarterly import values of CRMs for the EU during the period 2023-2024, the research employs a linear regression model to explore the correlation between CRM imports and economic competitiveness. The findings underscore the complexities of the relationship between CRM imports and EU competitiveness, highlighting the need for strategic policy frameworks that enhance recycling rates, promote research into alternative materials, and ensure sustainable practices in raw material extraction. This research contributes to a deeper understanding of the dynamics between resource dependency and market competitiveness, providing insights for policymakers aiming to secure a sustainable and competitive European economy. [ABSTRACT FROM AUTHOR]

As countries worldwide race toward a green transition, the demand for electric vehicles is surging, and with it comes a growing need for batteries. However, the push for increased domestic mining to secure these materials raises significant concerns about environmental sustainability. Even with stringent regulations, the environmental impact of mining can be profound, posing risks such as biodiversity loss, water pollution, and broader ecological damage. Furthermore, geopolitical tensions could arise as countries whose economic interests are threatened by these initiatives may react adversely. Local communities might also resist mining projects due to concerns over environmental degradation, health risks, and disruptions to their livelihoods. Given the critical importance of metals in the ecological transition, this challenge must be approached with the same urgency and global coordination as a pandemic response. Just as the world mobilized unprecedented resources to tackle COVID‐19, a similarly robust approach is necessary to ensure the availability of critical metals for a sustainable future. This paper suggests potential pathways for academic, technological, and societal advancements within the framework of a circular economy for lithium, aiming to secure a sustainable supply of this essential resource. [ABSTRACT FROM AUTHOR]

Abstract The United Nations (UN) strives for critical raw materials(CRMs) via sustainable development goals(SDGs). The growing population and pollution have thrusted the demand for critical materials for progressive science and technology and stunted overall economic growth worldwide. The current linear economy relies on a take-make-dispose policy. This approach extracts, uses and depletes CRMs which leads to ecological imbalance. Waste has become a major challenge for the sustainability of planet. Concerning to achieving UN sustainable development goals, the global mandate is to replace the outdated linear economy, this change is important for addressing material criticality and it can be possible because of the pillars of SDGs (Circular economy, 5Rs’ and Green-organic domain). At the start of this millennium, the world underwent economic transition. It moved from linear-circular and brown-green. This universal movements aim for Zero-Waste living. Consequently, 5R’s concept, i.e., Rethink, Refuse, Reduce, Reuse and Recycle, is an aptly irresistible weapon for combating ever-increasing waste/pollution for sustainable growth. In this regard, green organic principles are considered to stride to a circular and green economic perspective for better use of CRMs. The pillars of SDGs prevent potential destructive impacts on the environment and human health. They promote green-organic domain practices to obtain a more sustainable economy, addition to boosting quality of life by harmonizing disturbed climate change. Graphical Abstract

Critical raw materials (CRMs) represent essential resources for several strategic sectors in the European Union and strategies are necessary to reduce dependence on imports and improve the efficiency of their use. The European Union is facing significant challenges in diversifying supply chains, implementing effective sustainability standards, and reducing strategic dependencies on imports. Our study investigates the impact of critical raw material (CRM) imports on the competitiveness of the European market, addressing significant gaps in the existing literature regarding this relationship. Utilizing quarterly import values of CRMs for the EU during the period 2023-2024, the research employs a linear regression model to explore the correlation between CRM imports and economic competitiveness. The findings underscore the complexities of the relationship between CRM imports and EU competitiveness, highlighting the need for strategic policy frameworks that enhance recycling rates, promote research into alternative materials, and ensure sustainable practices in raw material extraction. This research contributes to a deeper understanding of the dynamics between resource dependency and market competitiveness, providing insights for policymakers aiming to secure a sustainable and competitive European economy.

Abstract Background To limit climate change and reduce further harmful environmental impacts, the reduction and substitution of fossil energy carriers will be the main challenges of the next few decades. During the United Nations Climate Change Conference (COP28), the participants agreed on the beginning of the end of the fossil fuel era. Hydrogen, when produced from renewable energy, can be a substitute for fossil fuel carriers and enable the storage of renewable energy, which could lead to a post-fossil energy age. This paper outlines the environmental impacts and levelized costs of hydrogen production during the life cycle of water electrolysis technologies. Results The environmental impacts and life cycle costs associated with hydrogen production will significantly decrease in the long term (until 2045). For the case of Germany, the worst-case climate change results for 2022 were 27.5 kg CO2eq./kg H2. Considering technological improvements, electrolysis operation with wind power and a clean heat source, a reduction to 1.33 kg CO2eq./kg H2 can be achieved by 2045 in the best case. The electricity demand of electrolysis technologies is the main contributor to environmental impacts and levelized costs in most of the considered cases. Conclusions A unique combination of possible technological, environmental, and economic developments in the production of green hydrogen up to the year 2045 was presented. Based on a comprehensive literature review, several research gaps, such as a combined comparison of all three technologies by LCA and LCC, were identified, and research questions were posed and answered. Consequently, prospective research should not be limited to one type of water electrolysis but should be carried out with an openness to all three technologies. Furthermore, it has been shown that data from the literature for the LCA and LCC of water electrolysis technologies differ considerably in some cases. Therefore, extensive research into material inventories for plant construction and into the energy and mass balances of plant operation are needed for a corresponding analysis to be conducted. Even for today’s plants, the availability and transparency of the literature data remain low and must be expanded.

The article is devoted to lignite deposits of Zakarpattia, which contain germanium, in particular, the Bigan deposit and methods of extracting germanium from this deposit. Ukraine has coal deposits with industrial concentrations of germanium and industrial capacity for obtaining high-purity germanium. Until recently, this allowed the domestic germanium complex to be among the leaders of the world market. Unfortunately, now the production of germanium in Ukraine is suspended, and the processing of metal-bearing coal is carried out without obtaining the corresponding germanium concentrate. Ukrainian coal deposits, which are characterized by germanium metal content, are currently not used in full for their complex purpose. The state mineral balance of Ukraine as of January 1, 2024 includes 226 subsoil exploitation objects with estimated germanium reserves. Germanium in Ukraine is associated mainly with coal deposits of the Donetsk and Lviv-Volyn coal basins, where it is found as an accompanying component. Germanium is found in all coal beds of the Lower, Middle and Upper Carboniferous of Donbass, but the most productive beds are found in hard coal of the Middle Carboniferous. Germanium content in Donbas coal ranges from 0.3–1.3 g/t in anthracite to 3.8–9.2 g/t in low-metamorphosed coal grades D, DG, G; however, as a rule, only coking coal with an average content of germanium at the level of 4.5 g/t was once used to obtain this metal thanks to the processing of the corresponding concentrate, which was produced at the chemical plants of the coke-chemical plants of Ukraine using the technology of extracting germanium compounds from supertar water. The content of germanium in brown coal of the Dnieper basin is relatively low (1–2 g/t of ash). At the same time, in the Transcarpathian lignite basin, the main mass of which is small deposits confined to the deposits of the Ilnytsia world of the Neogene Chop-Mukachivska and Solotvyn depressions. Thus, the content of germanium in lignite of the Novoselytskyi deposit is up to 280 g/t, in the Bigan deposit – up to 1000 g/t. The Bigan deposit itself requires further research as one of the most promising lignite deposits in Germany. It is worth noting that germanium is found in significant quantities not only in brown coal (lignites), but also in carbonaceous clays, where the concentration of germanium reaches 200 g/t. The decisive factor in the distribution of germanium in the layers is the nature of the plant material from which this layer is composed. Based on the analysis of the results of the work carried out, the highest germanium content (over 1000 g/t) is confined to pure varieties of lignite, and especially weakly carbonized wood residues, the amount of which depends on the concentration of germanium in the formation as a whole. It is quite clear that germanium in lignites is associated with humic acids, forming organometallic compounds. This is confirmed by the fact that by treating lignite with a 1% ammonia solution, it is possible to obtain up to 98% germanium. Geological exploration work at the Bigan deposit was carried out intermittently from 1953 to 1969. In 1961–1965, search operations were carried out on an area of about 30 km². Total of 486 wells (87,000 cubic meters) have been drilled in the field and adjacent areas since the beginning of geological exploration. The preliminary exploration of the Bigan deposit was carried out using the results of the search and exploration works of 1961–1967, while technological studies of the lignites of this deposit were also carried out. As a result, a feasibility study was drawn up, the summary of which was reduced to the fact that the Bigan deposit is characterized by a relatively high content of germanium, which allows this deposit to be considered a large potential source of germanium. It is worth noting that in the 80s of the last century, a technology was developed for the industrial development of the Malobigan and Bigan deposits by burning lignite at the Uzhhorod TPP, followed by hydrometallurgical processing of ash and dust containing several kilograms of germanium per ton. It is important that in Transcarpathia, in addition to the above-mentioned deposits, there are 15 more unexplored, but promising germanium-bearing areas. It should be noted that the concomitant extraction of germanium is one of the ways to improve the economic indicators of the coal industry and the comprehensive use of lignite deposits of Zakarpattia. The set of works carried out allows judging on the basis of experimental data about rational ways of using germanium-bearing lignites of the Bigan deposit.

This research introduces selective milling as a reliable and effective initial concentration process to enable efficient separation and ensure high recovery rates of valuable and critical materials (minerals and metals) from processed incinerator bottom ash (pr.IBA), a treated mineral fraction originating from the conventional municipal solid waste (MSW) incinerator bottom ash (IBA) processing steps. Four different types of pr.IBA (each sample weighing up to three tons) were selectively milled using a demonstration-scale vertical roller mill to produce three distinct products: fine, middle, and coarse fractions. Chemical analysis demonstrated that a concentration step after selective milling could be reliably achieved regardless of the variation in the sources and qualities of the input materials. Specifically, calcium-containing compounds can be enriched in the fine fraction, potentially containing Ca2SiO4, CaSO4, and CaCO3. Complementary to its particle size equivalent to the raw mix, this calcium segregation could be valuable as an alternative material in cement clinker production. Conversely, the segregation of metal-bearing substances, particularly iron and copper, was detected in the coarse fraction. Such segregation is comparable to specific ore grades and enhances the possibility of metal recovery from pr.IBA. [ABSTRACT FROM AUTHOR]

This paper presents the results of research on the possibility to obtain CRMs (REEs) and industrial metals (Zn) from slag as a waste generated as part of zinc and lead extraction processes. Physicochemical methods were used to separate CRM and Zn concentrates: magnetic separation, sintering with NaOH and leaching with selected mineral acids. After analysing the obtained results, it was found that the use of concentrated hydrochloric acid and a temperature of 363 K for leaching was effective in separating REEs from slags obtained from current production. The recovery rate in this case ranged from 83.73% for La to 98.03% for Eu. For slag samples (M1) obtained from current production from ZGH Bolesław S.A.(Poland) as well as HC Miasteczko Śląskie S.A. (Poland) and treated with concentrated HCl, the leaching level of Bi, Zn, Ni, Mn and P exceeded 90% compared to the content in the reference sample. For a historical slag sample from Ruda Śląska (Poland), treatment with concentrated HCl yielded a high leaching level of Cd (70.90%), Pb (78.66%), As (72.49%) and Mo (61.90%). A concentrate containing 1.64% of REEs and 67.1% of Zn was isolated from the solutions obtained after leaching by precipitation. An economic analysis of an REE concentrate extraction facility was also performed. For an operation of 17 years, the calculated NPV was −26,352,644 million EUR. The obtained results indicate that, for the analysed facility, recovering metals and critical raw materials from slag as a waste mass is not economically effective. [ABSTRACT FROM AUTHOR]

Over the course of the past decade, critical and strategic minerals lists have soared in popularity globally. Though nomenclature may range from critical minerals to critical raw materials, the core understanding is generally one informed by critical functionality – often linked to the energy or digital transition or to military purposes – and economic scarcity, which renders it vulnerable to supply chain disruptions. This paper develops a compendium of core critical and strategic minerals with global importance by comparing the critical and strategic minerals lists of ten jurisdictions (Australia, Canada, China, the European Union, India, Japan, the Republic of Korea, South Africa, the United Kingdom, and the United States) and collating a single list on the basis of clear majority representation. Because most mining law practitioners are not trained geologists, the paper then unpacks information that will be valuable to practitioners who encounter a given critical mineral in their practice: Where is it listed as a critical and strategic mineral? Geopolitically speaking, what does the world's security of supply look like? What are its main uses and why is it critical? How is it mined and refined, and are there any particular associated risks? What are the social and environmental impacts that are specifically associated with this mineral (as opposed to impacts broadly associated with all mining)? How easily substitutable is this commodity (given that that constitutes an economic risk to the mine)? Finally, what is the position regarding recyclability? Critical and strategic minerals vary in important ways from one another. The careful practitioner will want to derisk critical and strategic mineral projects in a targeted manner, mindful of the characteristics of the commodity at hand. Thus a rare earths project raises different considerations than a lithium one. Bespoke contracts require insight into the characteristics of critical and strategic minerals, as outlined in the Core Critical and Strategic Minerals Compendium. [ABSTRACT FROM AUTHOR]

The European Critical Raw Materials Law, in force since May 2024, constitutes a comprehensive response to the challenges of the supply chain of critical raw materials, to improve the single internal market, circularity and sustainability, streamlining the procedures for granting permits for critical projects, while seeking to ensure a high level of protection and environmental protection. The focus of this work is on the different environmental mandates for both the Commission and the Member States that will require an enormous effort, in a regulatory context of very strict environmental limitations. [ABSTRACT FROM AUTHOR]

Contaminated soils are a challenge for implementing biotechnology in bioremediation, the recovery of Critical and Strategic Raw Materials (CRMs and SRMs), and food security. European Union (EU) Governments have established strict limits on As, Pb, Cd, and Hg in foods (Document 32023R0915) and requested the recovery of 34 CRMs within a circular economy (CE) (5th CRMs list). This study proposed a biotechnological tool for the decontamination of soil with heavy metal(loid)s by arbuscular mycorrhizal (AM)-assisted phytoextraction and the subsequent recovery of CRMs or by phytostabilization to prevent their entry into the food chain. It consisted of placing Baccharis salicifolia plants, inoculated or non-inoculated with AM fungi, into bioreactors (BRs) containing mining soil with Cd, Ni, and Cu, according to the Argentinian Patent (AR090183B1). The bioextractive potential (BP) was also estimated at the highest Technological Readiness Level (TRL) using a vegetable depuration module (VDM, TRL 6). Inoculated plants showed significantly higher aerial bioaccumulation coefficients (Cd: 68.62; P: 2.99; Ni: 2.51; Cu: 0.18) in BRs, and the BP values reached 1.16 g, 9.75 g, 2.40 g, and 213.1 g for Ni, Cd, Cu, and P, respectively. Finally, these CRMs and SRMs could be recovered from biomass through hydrometallurgy within a CE framework. [ABSTRACT FROM AUTHOR]

Antimony is one of the world's scarcest metals and is listed as a Critical Raw Material (CRM) for the European Union. To meet the increasing demand for metals in a sustainable way, one of the strategies that could be implemented would be the recovery of metals as by-products. This would decrease the amount of hazardous materials filling mining dumps. The present study investigates the potential for producing antimony as a by-product at the Olympias separation plant in Northern Greece. This plant works a skarn mineralization that shows interesting amounts of Sb. Boulangerite (Pb5Sb4S11) reports on Pb concentrate levels reached 8% in the analyzed product. This pre-enrichment is favorable in terms of boulangerite recovery since it can be separated from galena through froth flotation. Boulangerite distribution in the primary ore is quite heterogeneous in terms of the inclusion relationships and grain size. However, a qualitative assessment shows that the current Pb concentrate grain size is too coarse to successfully liberate a good amount of boulangerite. The use of image analysis and textural assessments is pivotal in determining shape factors and crystal size, which is essential for the targeting of flotation parameters during separation. The extraction of antimony as a by-product is possible through a two-step process; namely, (i) the preliminary concentration of boulangerite, followed by (ii) the hydrometallurgical extraction of the antimony from the boulangerite concentrate. The Olympias enrichment plant could therefore set a positive example by promoting the benefits of targeted Sb extraction as a by-product within similar sulfide deposits within the European territory. [ABSTRACT FROM AUTHOR]

Critical raw materials (CRMs) are crucial for the production of different products and technologies. The correct quantification of CRMs consumption, including hidden uses along the products life cycle, can be made through the application of the Life Cycle Assessment (LCA) methodology. Starting from the eco-profile of a power supply unit, obtained through a LCA study, this paper focuses on the assessment of the total CRMs consumption of this device. In order to free the assessment from the mass of each CRM, two different approaches are applied, based on the supply risk and economic value, respectively. Similar percentage results are obtained when the assessment is based on the CRMs mass or supply risk index (with some exceptions), while the approach based on the economic value seems more able to bring out materials that are considered more "critical" in terms of economic importance. This research is developed within the activities of the project LOV-Lowering Ortigia's Voltage, funded by POC 2014-2020, CUP G39J18000690007. [ABSTRACT FROM AUTHOR]

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As one of the main waste streams of the manufacturing process of solid oxide cells (SOCs), scrap half-cells - discarded before the deposition of the barrier layer and the air electrode - imply the loss of significant quantities of ceramic composite material containing critical and hazardous elements, namely yttria-stabilized zirconia (YSZ) and NiO. These materials represent more than 90 wt% of an entire anode-supported cell. In this contribution, scrap half-cells were fragmented and subjected to three subsequent milling and sieving (below 25 μm) steps to recover composite NiO-YSZ powders with the appropriate specifications for reuse in SOC manufacturing. The overall characterization in terms of specific surface area, particle size distribution and crystalline phase retention confirmed the suitability of the recovered powders. Half-cells were manufactured including 30 wt% of recovered NiO-YSZ composite powders in their fuel electrode support, produced via tape-casting in combination with 70 wt% of virgin materials. The obtained cells were morphologically, mechanically and electrochemically tested and compared against standard cells constituted by 100 wt% of virgin materials. The electrochemical characterization highlighted 0.68 A cm−2 for the standard and recycled cells, at 600 °C and 0.7 V, while at 650 °C and same voltage both cells measured 1.12 A cm−2. This demonstrates the feasibility of recovering scrap SOCs through the presented method. [ABSTRACT FROM AUTHOR]

Rare earth elements are an essential critical raw material in the development of modern technologies and are highly sensitive to both supply chain disruptions and market turbulence. The presented study examines the characteristics of fuel, fly ash, and bottom ash from lignite combustion in power plant units. Also, we attempted to determine the amount of amorphous glass in the ashes and whether and to what extent the glass from the ash samples is bound to REY. The suitability of the ash was assessed as an alternative source of REY. The fuel and ash samples were acquired from power plants in Poland. The tests determined the fuel quality parameters, including the chemical and phase composition, of amorphous glass using ICP-MS and XRD methods, respectively. The study showed that all ash samples dissolved in 4% HF were enriched in REY. The efficiency of REY enrichment varied, and its presence in the residue samples was found to be in similar proportions compared to the raw sample. All ash residue samples were enriched in critical elements. The obtained values of the Coutl prospective coefficient allowed for the classification of some of the analyzed ashes and their residues after dissolution in 4% HF as prospective REY raw materials. [ABSTRACT FROM AUTHOR]

This work presents the first results of an emergency reading of Regulation (EU) 2024/1252 of the European Parliament and of the Council, of 11 April 2024, establishing a framework for ensuring a secure and sustainable supply of critical raw materials, which has been recently published in the Official Journal of the European Union, L Series, 3 May 2024. After a summary of the structure and content, it identifies the main obligations imposed on Member States. It then focus on the analysis of the challenges that its implementation may pose in Spain, from the perspective of the constitutional distribution of powers between the State and the Autonomous Communities. [ABSTRACT FROM AUTHOR]

Rare earth elements (REEs) are fundamental for various modern technologies and industrial applications. One significant application of REEs is in the production of neodymium-iron-boron (NdFeB) magnets, which are key components in electric vehicles (EVs), wind turbines, and electronic devices. These applications play a crucial role in driving the ecological and digital transition, highlighting the significance of REEs as strategic materials. With the dominance of very few countries in the REEs global supply and the rising of EVs demand, several concerns regarding resource availability, supply chain security, and price volatility have heightened the importance of efficient NdFeB magnet recycling, especially in Europe. This study assessed the elemental recycling potential of REEs from EV components through collaboration with authorized treatment facilities and metal recyclers in Italy. The study focused on three representative electric vehicles: a compact car, a van, and a hybrid vehicle. NdFeB magnets were found in various components, including the electric drive motor, air conditioning system, electric power steering, alternator, and electric gear box. The content of NdFeB magnets and REEs inside these components has been determined and economic feasibility of their recycling has been estimated by considering the intrinsic value of the raw materials contained. Despite being preliminary results, the economic value of REEs and Cu recoverable attested a promising potential for recycling, while the direct dismantling of magnets from the engine proves economically unviable for the studied components. Therefore, the study emphasizes the need for the development of specific recycling processes such as demagnetization and mechanical processing of the motors. The study also analysed the dismantling times of the target components from the vehicle and their relative economic impact on the potential for recovery. [ABSTRACT FROM AUTHOR]

The Critical Raw Materials Act (CRMA) is an essential regulatory framework designed to address the pressing challenges faced by the European Union (EU) in the strategic sectors of decarbonization, digitalization, and aerospace and defense. It aims to tackle the lack of secure and sustainable access to critical raw materials (CRMs) by increasing anticipation and mitigation of supply risks, fostering domestic CRM potential, and promoting sustainable sourcing practices. Part of a broader "Green Industrial Plan" and aligned with the "Net-Zero Industry Act" (NZIA), the CRMA strives to position the EU as a leading hub for clean tech industries. The NZIA and CRMA packages respond to international trends of protecting clean energy technology and resources, akin to the US Inflation Reduction Act. Defining materials as "strategic" based on their relevance and expected demand for strategic technologies, the CRMA regulation establishes benchmarks for minimum shares of EU demand to be covered by domestically sourced and processed as well as recycled raw materials and aims at reducing dependencies on single third country suppliers in all steps of the supply chain. A communication complements the regulation by focusing on increasing CRM supply security and sustainability through circularity, standardization efforts, skill development, and strategic actions for research and innovation. Establishing a "CRM Club" and partnerships with like-minded countries intend to strengthen international partnerships to safeguard CRM supply security and facilitate sustainable investment in resource-rich nations. Challenges arise concerning the concept of "strategic raw materials" and meeting benchmarks, particularly in materials availability, recycling targets, diversification, and the establishment of necessary skills. Data gaps, potential national differences, coherence with national legislation, long-term economic viability, and potential fuelling of international tensions also pose significant challenges to the effective implementation of the CRMA. Addressing these challenges and embracing the opportunities presented by the CRMA are crucial steps toward achieving sustainable resource management and advancing the EU's clean tech industries. [ABSTRACT FROM AUTHOR]

Mineral raw materials have always been of great importance in human history and have been the cause of numerous military conflicts. In addition, new technologies to mitigate climate change, sustainable energy production and mobility, as well as digitalisation, make particular chemical elements indispensable. Some of these raw materials are not mined from own deposits but are minor constituents of basic raw material deposits such as copper, zinc, aluminium and nickel and can only be produced together with them. Since geological resources and reserves of minor metals are generally not included in classification codes — such as JORC — their reserves or resources are not sufficiently documented. Consequently, no reliable assessment of their criticality is possible. We assume that different types of copper deposits have characteristic Se-concentrations. These values are linked and extrapolated with our own database of copper deposits, which is precisely structured according to the type of deposit, tectonic setting, age of mineralisation, copper grades, reserves and resources and geographic location. The result is a tabular listing of selenium's geological reserves and resources according to the relevant countries, type of deposit, tectonic setting, regions and geological age. These findings show the average Se-content and size of copper deposits. The calculated resources of around 25 million tonnes of selenium are well over two hundred times higher than previously documented and are available to accommodate increasing demand. The methodology presented is suitable for estimating the reserves and resources of other minor metals such as platinum, cobalt, bismuth, molybdenum and tantalum as they are typical constituents of primary mineralisations. [ABSTRACT FROM AUTHOR]

The aim of the research was to assess the potential of bottom ash from Polish coal-fired power plants as an alternative source of rare earth elements (REY). The potential of these ashes was compared with fly ash from the same coal combustion cycle. The phase and chemical composition, as well as REY, were determined using: X-ray diffraction and inductively coupled plasma mass spectrometry. The tested ashes were classified as inert-low pozzolanic and inert-medium pozzolanic, as well as sialic and ferrosialic, with enrichment in detrital material. The phase and chemical composition of bottom ash was similar to fly ash from the same fuel combustion cycle. The REY content in the ash was 199–286 ppm and was lower than the average for global deposits, and the threshold value was considered profitable for recovery from coal. Bottom ash's importance as a potential source of REY will increase by recovering these metals from separated amorphous glass and mullite and grains rich in Al, Mg, K, and P. The industrial value of bottom ash as an alternative source of REY was similar to fly ash from the same fuel combustion cycle. [ABSTRACT FROM AUTHOR]