METHOD OF PRODUCING SILICON

摘要

PROBLEM TO BE SOLVED: To provide a method of producing silicon by a zinc reduction method which is can recover and recycling zinc from by-product zinc chloride by a safe method simple in the operation or the maintenance.

SOLUTION: The method of manufacturing silicon includes: a reduction step S1 of obtaining silicon and zinc chloride gas by bringing silicon tetrachloride gas into contact with zinc; zinc extraction steps S2, S2' of extracting a zinc component into an organic solvent phase by bringing a zinc chloride solution into contact with an organic solvent containing an acidic extracting agent and immiscible with an aqueous solution after the zinc chloride gas produced in the reducing step is recovered as the zinc chloride aqueous solution; a zinc back extraction step S3 of obtaining a zinc sulfate aqueous solution by back-extracting the organic solvent containing the zinc component obtained in the zinc extraction step with diluted sulfuric acid; and an electrolysis step S4 of electrolyzing the zinc sulfate aqueous solution obtained in the zinc back extraction step to obtain zinc.

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