| 摘要 |
Potassium sulfate is produced from a mixture of carnallite, potassium chloride, kieserite and residual quantities of less than 15% by weight of rock salt by treating the mixture at a temperature of 20 DEG -40 DEG C with potash magnesia liquor to form a slurry with at most 70 mole MgCl2/1000 mole H2O, whereafter the liquor portion of the slurry comprising a solution saturated with carnallite and rock salt is separated from the solid substance, which solid substance is then converted at temperatures of 75 DEG -110 DEG with a sulfate liquor, which contains 18-45 mole MgCl2/1000 mole H2O, into a mixture of langbeinite and potassium chloride, which mixture after separation from the liquor is treated at temperatures of 15 DEG -110 DEG C with a sulfate liquor containing 18-50 mole MgCl2/1000 mole H2O, whereupon the crystallizate is separated from the mother liquor and is converted with water to potassium sulfate.
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