| 摘要 |
A method of producing potassium sulphate from alkali metal sulphates or their mixtures with carbonates wherein the sulphates or their mixtures with carbonates are treated with a solution of potassium hydroxide followed by isolating the potassium sulfate product. The present method is preferably carried out by employing a counterflow continuous flow scheme involving not less than two treatments of the sulphates with alkaline solutions, and after each alkaline treatment, the mother liquor, which is essentially a mixture of alkali hydroxides, is separated from the residue obtained, the first treatment of the sulphates being carried out with the mother liquor obtained in the course of the second alkali treatment and further each treatment of the sulphates being carried out with the mother liquors obtained in each subsequent treatment, the last treatment of the sulphates being carried out with a solution of potassium hydroxide, followed by isolating the potassium sulfate product. The present method finds application in the complex treatment of alunite, natural sulphates, in treating soda-sulphate wastes of alumina production, etc.
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