| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing a highly pure polycrystal silicon, stable in quality for a solar battery use and matching to price cutting. SOLUTION: This method for producing a highly pure silicon combines a zinc-smelting process comprising a step for reacting a zinc-containing ore with oxygen to provide a zinc oxide, a step for reducing the zinc oxide with carbon to provide a zinc gas, and a step for distilling and condensing the generated zinc gas to collect molten zinc, with a process for carrying out a zinc-reduction of silicon tetrachloride, which is a silicon raw material. In the method, when carrying out the zinc-reduction, the silicon tetrachloride is reduced by the molten zinc in a reaction vessel to collect a polycrystalline silicon, or when carrying out the zinc reduction, the silicon tetrachloride is reduced by the zinc gas in the reaction vessel to collect the polycrystalline silicon. |
