Production of potassium sulfate from langbeinite

Details Production of potassium sulfate from langbeinite Production of potassium sulfate from langbeinite

C - Chemistry, Metallurgy

01

D

23/170, 23/99

C01D 5/00 (2006.01) C01D 3/08 (2006.01) C01D 3/16 (2006.01)

Patent

CA 1145917

ABSTRACT An improved method of producing potassium sulfate from langbeinite. The improved method employs a "salting out" step to remove additional KCl from the mother liquor resulting from K2SO4 crystallization. NaCl is added to the mother liquor to cause precipitation of KCl crystals. The amount of NaCl added is controlled to an amount below the saturation point for NaCl in the solution to avoid contaminating the KCl with solid NaCl. The KCl crystals are recycled back to the K2SO4 reactors as a source of KCl. The "salting out" step eliminates an energy-intensive sub- merged combustion evaporation step from the K2SO4 recovery process and consequently reduces atmospheric emissions. In certain material balance situations, excess end liquor resulting from the above "salting out" operation can be subjected to evaporation (solar evaporation being preferred) to recover the remaining sodium and potassium values, and to produce a concentrated magnesium chloride solution which is useful in the primary langbeinite/sylvin- ite ore refining cycle to inhibit undesirable glaserite formation. The sodium and potassium salts obtained from evaporation can be recycled to the "salting out" step.

386979

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