Preparation of high-quality silicon, useful e.g. as solar or semiconductor silicon, by high-temperature reaction of lime, carbon and silicate, then purification and thermal decomposition of the calcium silicide formed

摘要

Method for preparing high-purity silicon by the calcium silicide method, at high temperature. The new feature is that reaction of calcium oxide (or calcium carbonate) with carbon and silica is done discontinuously in a furnace at reaction melt temperature of 2500-3500 deg. C.