The object of the present invention is to provide a kind of method for preparing Tin Oxide, and its operation is simple, process parameter is easy to control, and cost is low, and the Tin Oxide purity that makes is high, can reach more than 99%, crso.02%, product dissolves in methyl The solution was clear after sulfonic acid.
The main technical scheme adopted to realize the object of the present invention is: 1. neutralization reaction: the tin protochloride of crystallization and sodium carbonate are dissolved into solution, while stirring, the sodium carbonate solution is gradually added in the Tin Oxide solution on the one hand, and the reaction terminal pH Value is 6～7, and reaction solution has white precipitate to separate out;
② Transformation reaction: immediately heat the neutralized reactant, add sodium hydroxide aqueous solution to the material at the same time, keep it in a boiling state, and the conversion is completed when the white precipitate is transformed into a blue-black precipitate;
③ Washing and drying: After the conversion, the reactant is washed with water to remove cr, and the cr concentration is less than 0.2%, after which an antioxidant is added. After the product is filtered, the temperature is raised for vacuum drying to obtain Tin Oxide.
Concrete technical scheme of the present invention also includes:
During neutralization reaction, the weight percent concentration of stannous chloride solution is 30%～50%, and sodium carbonate solution concentration 18～22%; During transformation reaction, sodium hydroxide solution concentration is 4%～15%, and the control reaction solution The pH value is 10～12, keeps reaction solution boiling 1h.
In the washing and drying process of the present invention, the antioxidant added after washing is cresol sulfonic acid, and the addition amount is to add 2ml antioxidant for every 500g crystallized stannous chloride, and the drying is at 80°C. C~100. Under C, the time is 2h～3h.