Patent ID: 9352970
Filing Date: 2016-05-31
CPC Classification: C01B,C07C

Claim Text:
1. A method of producing silicon for solar cells by a metallurgical process, the method comprising: a step of reduction in an arc furnace, consisting of introducing a silicon raw material into an arc melting furnace and smelting silicon of the introduced silicon raw material with carbon; a step of refining step by slag consisting of subjecting the reduced silicon to slag refining in a slag refining apparatus connected continuously to the arc melting furnace; a step of refining by unidirectional solidification consisting of unidirectionally solidifying the slag-refined silicon; and a step of steam plasma-electromagnetic continuous refining consisting of introducing the unidirectionally solidified silicon into a crucible surrounded by an induction coil and treating the introduced solidified silicon with a steam plasma torch while melting the solidified silicon.