METHOD FOR THE PURIFICATION OF SILICON

摘要

The invention concerns a method for purifying silicon from boron by treating crude silicon with molten slag. Silicon is contacted with a slag, the slag-forming components of which consist of solid chlorine compounds and at least one compound selected from the group consisting of oxides, hydroxides, carbonates of alkali and/or alkaline earth metals as well as silica. Chlorides of alkali and/or alkaline earth metals can be used as solid chlorine compound.