Patent ID: 9458294
Filing Date: 2016-10-04
CPC Classification: C01B,C01G,C08G,Y02P

Claim Text:
1. A method for removing impurities from silicon, comprising: A) providing metallic silicon having impurities, B) mixing the metallic silicon with at least one halogenated polysilane of Formula SiX C) i) heating the metallic silicon of A) prior to the mixing of B), or ii) heating a mixture of the metallic silicon and the at least one halogenated polysilane of B) so that there is at least partly a reaction of the impurities with the at least one halogenated polysilane or with a decomposition product of the at least one halogenated polysilane, wherein in B) the at least one halogenated polysilane is added in encapsulated form and the encapsulation consists of or comprises silica glass.