Patent ID: 7538044

Claim:
A method of producing high purity silicon using silicon tetra-chioride as raw material comprising the steps of: 1) performing a gas phase reaction between silicon tetra-chloride and metal zinc in zinc chloride gas in a reaction furnace; 2) separating produced metal silicon in a liquid state from gas; 3) separating a part of the zinc chloride gas which is cooled and liquefied; 4) electrolyzing the liquid zinc chloride to produce chlorine gas and molten zinc; 5) vaporizing the produced molten zinc by heating which is sent to the reaction furnace; 6) reacting the chlorine gas produced by the electrolysis with coarse silicon to generate coarse silicon tetra-chloride; 7) purifying the coarse silicon tetra-chloride by means of distillation; and 8) vaporizing the purified silicon tetra-chloride which is sent to the reaction furnace.