年間 8 号発行
ISSN 印刷: 2150-3621
ISSN オンライン: 2150-363X
Indexed in
DEVELOPMENT OF TECHNOLOGICAL FOUNDATIONS FOR PURE SILICON PRODUCTION BY CARBOTHERMIC REDUCTION
要約
Currently, pure silicon suitable for use in photovoltaics is produced by the expensive Siemens chloride method. Nevertheless, efforts are continuing to manufacture clean and suitable silicon for photovoltaics by the metallurgical method of carbothermic reduction. In the availability of pure silica materials, the main obstacle in an implementation of this technology is the lack of sufficiently pure carbon reductants. We proposed to use pyrocarbon as a reducing agent. This pyrocarbon is formed as an encapsulation coating of granular quartz particles with their treatment by gaseous hydrocarbons in electrothermal fluidized bed. The thickness of the resulting layer of pure pyrocarbon can be regulated within prescribed limits by temperature, hydrodynamics, and process duration. We constructed the laboratory and pilot plants for production of raw materials in large quantities on the basis of granular quartz capsulated by pyrocarbon for the subsequent electromelting. Attempts to melt the referred charge in an usual induction furnace and an electron-beam furnace have not brought the desired result because of a number of technical and physical reasons. After a theoretical analysis and discussions with experts, the new ion-plasma unit for reduction melting has been created. The process has been carried out in an argon atmosphere, at an operating pressure of 0.0001−0.001 torr. The first experimental meltings showed positive results. Melting in a diffuse arc discharge in vacuum allows to refine metallurgical silicon by evaporation and oxidation of impurities.
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Bondarenko B.I., Sviatenko O.V., Khovavko A.I., Kotov V.G., Nebesny A.A., Filonenko D.S., Big Multi-Walled Carbon Nanotubes Synthesis Using a Reduced Iron as a Catalyst, 2018 IEEE 8th International Conference Nanomaterials: Application & Properties (NAP), 2018. Crossref
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Semeiko K. V., Kustovskyi S. S., Kupriyanchuk S. V., Chumak R. E., Dependence of the Pyrocarbon Structure on the Parameters of the Process of Pyrolysis of Hydrocarbon Gases in an Electrothermal Fluidized Bed, Journal of Engineering Physics and Thermophysics, 93, 3, 2020. Crossref
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Simeyko K.V., Malinouski A.I., Karsim S.O., Sydorenko M.A., Kustovska A.D., Liaposhchenko O.O., Kupriyanchuk S.V., INVESTIGATION OF THE PROCESS OF OBTAINING PYROCARBON IN AN ELECTROTHERMAL FLUIDIZED BED, Energy Technologies & Resource Saving, 3, 2021. Crossref
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Simeiko K.V., RESEARCH OF CHARACTERISTICS AND PROPERTIES OF PYROCARBON COATINGS, Energy Technologies & Resource Saving, 1, 2018. Crossref