C - Chemistry – Metallurgy – 01 – D
Patent
C - Chemistry, Metallurgy
01
D
23/149
C01D 3/08 (2006.01) C01F 5/30 (2006.01)
Patent
CA 1092323
ABSTRACT OF THE DISCLOSURE PROCESS FOR THE PRODUCTION OF POTASSIUM CHLORIDE AND MAGNESIUM CHLORIDE FROM CARNALLITE The present invention relates to a process for the production of potassium chloride and of magnesium chloride hexahydrate (bischoffite) from carnallite or from carnallite containing sodium chloride. The process comprises heating carnallite at a temperature of between above 70°C and above 167.5°C in the presence of added water at the above former temperature or without added water (but preventing evaporation of water) at the above latter temperature. Solid potassium chloride is then separated. In the residual brine, carnallite is precipitated by evaporation or by lowering the temperature, and it is recycled to the starting stage. The residual solution consists essentially of magnesium chloride which is recovered as bischoffite.
289029
Israel Chemicals Ltd.
Sim & Mcburney
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