Obtaining homogeneous silicon in the process of alumothermic reduction of silicon dioxide

Abstract

The influence of charge components on emergence of a homogeneous phase of silicon in the process of silicon dioxide reduction by aluminium has been studied. Optimal process parameters affecting the quality of the end product have been identified. These include the ratio of components of the synthetic charge (CaO, SiO2 , CaF2 ), the optimal amount of SiO2 , the optimal amount of a reducing agent (Al) and the optimal Si/slag ratio. The homogeneous phase of silicon is easily separated from the slag, which contributes to the reduction of waste silicon during further technological operations.

Keywords

• silicon
• alumothermic reduction
• slag
• upgraded metallurgical-grade
• solar grade
• homogeneous metallic phase