NOVELTY - Silicon-tetrachloride gas (M1) is contacted (S1) with zinc (M8), to obtain zinc-chloride gas. The gas is recovered as aqueous solution (M3) and contacted with an organic solvent (M4) and an aqueous solution of acidic extractant. A zinc component is extracted (S2) and back extraction (S3) of organic solvent (M5) containing zinc component is carried out using dilute sulfuric acid, to obtain zinc-sulfate (M6) aqueous solution. The zinc-sulfate aqueous solution is electrolyzed (S4) to obtain zinc, which is used for contacting with silicon-tetrafluoride gas.    USE - Manufacture of silicon for solar cells.    ADVANTAGE - The method enables safe and simple manufacture of silicon, and recovery of highly purified zinc, without requiring any complicated process.    DETAILED DESCRIPTION - Silicon-tetrachloride gas is contacted with zinc, to obtain silicon (M2) and zinc-chloride gas. The zinc-chloride gas is recovered as zinc-chloride aqueous solution, and contacted with an organic solvent and an aqueous solution containing an acidic extractant. A zinc component is extracted in the organic-solvent phase and back extraction of the organic solvent containing the zinc component is carried out using dilute sulfuric acid, to obtain zinc-sulfate aqueous solution. The zinc-sulfate aqueous solution is electrolyzed to obtain zinc, which is used for contacting with silicon-tetrafluoride gas. The aqueous solution containing remaining dilute sulfuric acid (M7) obtained after electrolysis, is used for back extraction.    DESCRIPTION OF DRAWING(S) - The drawing shows a process drawing of the silicon manufacturing method. (Drawing includes non-English language text)    Silicon-tetrachloride gas (M1)    Silicon (M2)    Zinc-chloride aqueous solution (M3)    Organic solvent (M4)    Organic solvent containing zinc component (M5)    Zinc sulfate (M6)    Sulfuric acid (M7)    Zinc (M8)    Contact process (S1)    Extraction process (S2)    Back-extraction process (S3)    Electrolysis (S4)