METHOD FOR DEPHOSPHORIZING SILICON

摘要

PURPOSE: A dephosphorization method of silicone is provided to be able to efficiently perform a process by reducing phosphorus in silicone without using vacuum. CONSTITUTION: A dephosphorization method of silicone comprises the following steps: a step of adding calcium in a molten silicone solution; a step of obtaining silicone ingot by coagulating the molten silicon solution added with calcium; a step of obtaining silicon powder by crushing the silicone ingot; a step of washing the silicone powder with acid; and a step of coagulating the washed silicon powder to one direction. [Reference numerals] (AA) Making alloy by adding Ca; (BB) Liquid concentration containing Si impurities; (CC) Si-CaSi2 phase separation