Mathematical Modeling оf the Silicon Production Process from Pelletized Charge

Abstract:

The paper considers the problem of recycling the dust waste resulting from metallurgical silicon production; such dust contains considerable amounts of valuable silica. The problem is solved by redirecting this byproduct to the silicon smelting process. We herein propose using the dust left in silicon and aluminum production as a component of pelletized charge, used for silicon smelting in ore-thermal furnaces (OTF). Mathematical (physico-chemical) modeling was applied to study the behavior of pelletized-charge components, in order to predict the chemical composition of smelting-produced silicon. We generated a model that simulated the four temperature zones of a furnace, as well as the crystalline-silicon phase (25°С). The model contained 17 elements entering the furnace, due to being contained in raw materials, electrodes, and the air. Modeling produced molten silicon, 91.73 wt% of which was the target product. Modeling showed that, when using the proposed combined charge, silicon extraction factor would amount to 69.25%, which agrees well with practical data. Results of modeling the chemical composition of crystalline silicon agreed well with the chemical analysis of actually produced silicon.

• Periodical: Materials Science Forum (Volume 989)
• Pages: 394-399
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.989.394
• Online since: May 2020
• Authors: Nina V. Nemchinova, Andrey A. Tyutrin*, Sergei N. Fedorov
• Keywords: Carbothermic Process, Mathematical Model, Pelletized Charge, Silicon Production, Technogenic Raw Materials

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