Method of manufacturing potassium sulfate

Details Method of manufacturing potassium sulfate Method of manufacturing potassium sulfate

C - Chemistry, Metallurgy

01

D

23/99

C01D 5/02 (2006.01)

Patent

CA 1166425

ABSTRACT OF THE DISCLOSURE "METHOD OF MANUFACTURING POTASSIUM SULFATE" This improved method comprises a first dry step of reacting concentrated sulfuric acid and acid potassium sulfate with potassium chloride at about 300°C in a slurried state to obtain a mixed molten salts of KnH2-nSO4 (n being 1.3 to 1.4); a second wet step of dissolving said mixed salts and additional raw potassium chloride in water, the amount of water being limited to some extent, heating the solution to 60° to 90°C in order to take place a wet reaction, and cooling the solution to 50° to 20°C to depo- sit potassium sulfate crystals from the solution in order to obtain the final product and filtrate; and a third cir- culating step of evaporating the filtrate to obtain a cake of mixed salts of acid potassium sulfate and potassium chloride, and returning circulatingly the cake to the first stage as part of raw materials.

410013

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