Method of producing alumina and potassium sulphate form alunite
OwnerGakif Zakirovich Nasyrov, Nikolai Andreevich Kaluzhsky +1inventors
InventorsGakif Zakirovich Nasyrov, Nikolai Andreevich Kaluzhsky, Vladimir Nikolaevich Kostin
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Abstract
The specific feature of the present method is that in the process solution resulting in the processing of alunite with the object of producing alumina and potassium sulphate therefrom, an excess amount of sodium ions is maintained with respect to the potassium ions. The method is advantageous in that it ensures a higher yield of potassium sulphate and a lower contamination of the final products with respect to sodium and potassium ions.
Claims8
A method of producing alumina and potassium sulphate from alunite comprising contacting alunite with a solution of caustic alkalies at a temperature of from 70.degree. to 90.degree. C to thereby transfer sulphates and aluminates of sodium and potassium into solution, said solution being denoted the process solution;
- maintaining a percentage concentration in the process solution of sodium ions with respect to the sum of potassium and sodium ions in the same solution of not less than 70 per cent at all times;
- precipitating a mixture of sodium and potassium sulphates from the process solution;
- separating the precipitate from the remaining process solution;
- treating said precipitate with potassium hydroxide to obtain potassium sulphate;
- and recovering alumina from said remaining process solution.
Dependencies are inferred from the claim text.