| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for producing an alkali stannate compound, containing neither anions such as chloride ion, sulfate ion, nitrate ion, and the like except stannate ion nor metal tin component, and not requiring great energy. SOLUTION: A raw material tin such as metal tin, as alloy or another material containing tin is thrown into an aqueous solution of an alkali hydroxide such as potassium hydroxide, sodium hydroxide or lithium hydroxide. A fixed reaction temperature is maintained while constantly making the aqueous solution of alkali hydroxide flow on the surface of the raw material tin by stirring or circulating the aqueous solution of the alkali hydroxide and a reaction is carried out by dripping a hydrogen peroxide solution as a reaction promoter to a reaction solution to give an aqueous solution of stannate containing an insoluble component. The insoluble component is filtered off from the aqueous solution of stannate. Crystal of potassium stannate, sodium stannate or lithium stannate is obtained by a method for concentration under reduced pressure, evaporation, crystallization or centrifugation from the aqueous solution of stannate.
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