Process for the manufacture of potassium sulphate by treating solutions containing magnesium chloride and potassium chloride
AssigneeMines de Potasse d'Alsace S.A.
InventorsMichel Bichara, Emile Wendling, Michel Bodu
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Abstract
Process for the manufacture of potassium sulphate from solutions containing magnesium chloride and potassium chloride from solutions, more particularly from mother liquors issuing from the treatment of carnallite. According to this process sodium sulphate and potassium chloride are added to the solutions so as to precipitate sodium chloride and schoenite (K.sub.2 SO.sub.4.MgSO.sub.4.6H.sub.2 O) and the schoenite is treated in a known manner to produce potassium sulphate.
Claims6
In a process for the production of schoenite from an equilibrium mother liquor obtained from a process of treating carnallite to precipitate synthetic sylvinite, said equilibrium mother liquor consisting essentially of saturation quantities of potassium chloride and sodium chloride, a substantial-saturation quantity of magnesium chloride, and magnesium sulphate, wherein the schoenite is precipitated from said equilibrium mother liquor, the improvement which comprises in a first step adding sodium sulphate to said equilibrium mother liquor to form a precipitate containing mainly sodium chloride;
- separating said precipitate of sodium chloride from the resultant mother liquor;
- and in a second step adding potassium chloride to said resultant mother liquor to form a precipitate containing mainly schoenite.
Dependencies are inferred from the claim text.