Method for producing an alkali metal hydroxide

摘要

A purification method for an alkali metal chloride, which comprises separating, from a mixture comprising one type of alkali metal chloride and other water-soluble inorganic salt, said other water-soluble inorganic salt, to purify said alkali metal chloride, wherein water or an aqueous solution of said alkali metal chloride is added to said mixture in such an amount that is sufficient to dissolve at least one type of said other water-soluble inorganic salt substantially in its entire amount and that is not sufficient to dissolve said alkali metal chloride substantially in its entire amount, thereby to dissolve said other water-soluble inorganic salt substantially in its entire amount, and the obtained slurry is subjected to solid-liquid separation to recover the solid component.