METHOD FOR PURIFYING SILICON

PROBLEM TO BE SOLVED: To provide silicon for a solar cell at a low cost by efficiently purifying without reducing purification speed. SOLUTION: A purification method of silicon disclosed in this invention is the one for purifying molten silicon containing impurity elements, and in a first aspect, it is characterized by having: a process for removing a product containing the impurity elements from the molten silicon by bringing a purification gas containing a component reacting with the impurity elements into contact with the molten silicon; and a process for removing a product formed by the reaction of the molten silicon and the purification gas by bringing a treating gas having lower reactivity with the molten silicon into contact with the molten silicon. COPYRIGHT: (C)2006,JPO&NCIPI