Efficient carbothermal reduction of diatomaceous earth to silicon using microwave heating

Nagahata, Ritsuko; Mori, Yusuke; Saito, Yuko; Takeuchi, Kazuhiko; Shimizu, Yoshifumi R.; Shimizu, Masayoshi; Benioub, Rabie

doi:10.1016/j.matchemphys.2020.123744

Cited by 11 publications

(2 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…e carbothermal reductions of SiO 2 in vacuum roasting pretreatment process were very complicated. us, the thermodynamic analysis only listed the reactions with significant products in the experimental process [39]. e first carbothermal reduction reaction (equation ( 4)) could take place at 927 °C, and this could be confirmed with the SiC that appeared in calcine at 1,200 °C in the XPS analysis part.…”

Section: 41mentioning

confidence: 96%

Study on Vacuum Roasting Pretreatment of Carbonaceous Gold Concentrates Based on Nonoxidation Technology

Zhang

Song

Yin

et al. 2021

Journal of Chemistry

View full text Add to dashboard Cite

Carbonaceous gold ores are difficult to treat because of the “preg-robbing” by carbonaceous matters and locking by minerals. Roasting is the most commonly used method that is useful in dealing with carbonaceous gold ores. In this study, flotation gold concentrates containing sulfides and carbonaceous matters were investigated to ascertain the reaction process and the matters’ transformation characteristics in different temperatures by vacuum roasting pretreatment. Calcine and volatile condensates were characterized with several techniques. In the process of vacuum roasting, the main chemical reactions were decomposition reaction and carbothermic reduction reactions of sulfide ores, carbothermic reduction reactions of SiO2, and thermal decomposition reactions of organic carbon. The bad effects of “preg-robbing” by carbonaceous matters were greatly weakened by the thermal decomposition and carbothermal reduction. The gold locking minerals were mainly removed by reduction reactions. The sulfides were removed in ways that did not produce SO2. The removal of sulfur and carbonaceous matters during the vacuum roasting process was 95.83% and 65.38%, respectively. Direct cyanidation of the calcine extracted from 2.13% to 88.37% of the gold content with a vacuum degree of 10 Pa and roasting from 25°C to 1,200°C for 30 min.

show abstract

Section: 41mentioning

confidence: 96%

Study on Vacuum Roasting Pretreatment of Carbonaceous Gold Concentrates Based on Nonoxidation Technology

Zhang

Song

Yin

et al. 2021

Journal of Chemistry

View full text Add to dashboard Cite

show abstract

“…There is much ongoing research to find lower-cost methods to produce solargrade silicon (e.g. Marchal et al 2015;Darghouth et al 2021;Nagahata et al 2021).…”

Section: Silicon-based Photovoltaic Technologymentioning

confidence: 99%

Economic Geology Models 5. Specialty, Critical, Battery, Magnet and Photovoltaic Materials: Market Facts, Projections and Implications for Exploration and Development

Simandl¹,

Simandl

Paradis

2021

View full text Add to dashboard Cite

Many exploration companies are now focusing on specialty materials that are associated with so-called ‘green technology’. These include ‘battery materials’, ‘magnet materials’ and ‘photovoltaic materials’, and many such commodities are also broadly labelled as ‘critical materials’ because they are seen as vital for industrial development, societal needs or national security. The definitions used for such materials are not always consistent among jurisdictions or across industry, and this paper attempts to clarify the criteria and address some common misconceptions. The distinction between major minerals (e.g. base metals) and ‘specialty materials’ (i.e. those mined or produced in much smaller amounts) is particularly important. The markets for many specialty materials are growing faster than those for traditional ferrous, precious and base metals and they are often portrayed as excellent long-term investment opportunities. However, the small market bases for specialty materials and considerable uncertainty around growth projections (especially related to material substitutions and rapid technological change) need to be taken into consideration for objective assessment of the development potential of any proposed project, establishment of new supply chains by major corporations, and responsible decision-making (mineral policy) by government. In the short-term, projects aimed at specialty materials (materials with a small market base) cannot benefit from economy of scale, and their development hinges on commercially proven metallurgical processes, unless they are supported by governments or end-users. Several specialty metals (e.g. germanium, indium, cadmium, and cobalt) are commonly obtained as by-product of base metal extraction. In such cases, systematic testing of base metal ores for their specialty metal content may justify the addition of relevant recovery circuits to existing smelters. If positive results are obtained, the need for targeting new sources of such specialty metals as primary exploration targets may be reduced or eliminated. Where market conditions permit and concerns about the future availability of materials seem reliable, grass-roots exploration for specialty materials is warranted, and pre-competitive government involvement may be justified to promote such development efforts.

show abstract

Design and Functionalization of Lignocellulose‐Derived Silicon‐Carbon Composites for Rechargeable Batteries

Li,

Xu,

Wang

et al. 2024

Advanced Energy Materials

View full text Add to dashboard Cite

Silicon/carbon (Si/C) composites present great potential as anode materials for rechargeable batteries since the materials integrate the high specific capacity and the preferable cycling stability from Si and C components, respectively. Functional Si/C composites based on lignocellulose have attracted wide attention due to the advantages from lignocellulose, including sustainability property, flexible structural tunability, and diverse physicochemical functionality. Although the flourishing development of rechargeable batteries boosts the studies on lignocellulose‐derived Si/C materials with high electrochemical performance, the publications that comprehensively clarify the design and functionalization of these high‐profile materials are still scarce. Accordingly, this review first systematically summarizes the recent advances in the structural design of lignocellulose‐derived Si/C composites after a brief clarification about the Si selection sources based on self and extraneous sources. Afterward, the functionalization strategies, including nanosizing, porosification, and magnesiothermic reduction of Si material as well as heteroatom modification of C material, are specifically highlighted. Besides, the applications of lignocellulose‐derived Si/C‐based materials in rechargeable batteries are elaborated. Finally, this review discusses the challenges and prospects of the application of lignocellulose‐derived Si/C composites for energy storage and provides a nuanced viewpoint regarding this topic.

show abstract

Efficient carbothermal reduction of diatomaceous earth to silicon using microwave heating

Cited by 11 publications

References 12 publications

Study on Vacuum Roasting Pretreatment of Carbonaceous Gold Concentrates Based on Nonoxidation Technology

Study on Vacuum Roasting Pretreatment of Carbonaceous Gold Concentrates Based on Nonoxidation Technology

Economic Geology Models 5. Specialty, Critical, Battery, Magnet and Photovoltaic Materials: Market Facts, Projections and Implications for Exploration and Development

Design and Functionalization of Lignocellulose‐Derived Silicon‐Carbon Composites for Rechargeable Batteries

Contact Info

Product

Resources

About