METHOD FOR PRODUCING SOLAR GRADE SILICON FROM SILICON DIOXIDE

摘要

A method for producing a solar grade silicon including preheating silica to a temperature of from about 1300 degrees Celsius (°C) to about 1400°C and combining aluminum with the preheated silica to melt the aluminum and produce an aluminum-silicon alloy. The aluminum-silicon alloy is fractionally crystallized to produce first silicon crystals, which are acid leached to produce high-purity second silicon crystals. The high-purity second silicon crystals are refined to produce refined silicon, which is further purified to produce solar grade silicon.