Reduction refining method of Phosphorus from MG-Si by strongly reducing slags

摘要

A method for reducing and refining P in MG-Si using slag is provided. The present invention comprises the steps of adjusting the atmosphere of the refining crucible to a reducing gas atmosphere consisting of at least one inert gas selected from CCl ₄ , CF ₄ , Ar, He, N ₂ and at least one reducing gas of H ₂ and CO; An alkaline earth metal oxide composed of at least one of SiO ₂ , CaO, MgO, and BaO such that the weight ratio of the MG-Si raw material, the MG-Si raw material, and the slag is 1: 1 to 3 in the crucible adjusted to the atmosphere; At least one alkali metal oxide of Na ₂ O, K ₂ O, Li ₂ O; And charging the slag made of CaF ₂ together; And heating the crucible to melt the charged MG-Si raw material and slag to remove P in the molten Si into slag in the form of Phosphide (P ³⁻ ) ion through an interfacial reaction between molten Si and slag. .