Production of potassium chloride from langbeinite

Details Production of potassium chloride from langbeinite Production of potassium chloride from langbeinite

1980-10-20

1982-06-15

Clements, Gregory N.

Chemistry: physical processes

Physical processes

Crystallization

23302R, 71 61, 71 63, 423499, C01D 308, C01D 324

Patent

active

043348858

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 K.sub.2 SO.sub.4 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 K.sub.2 SO.sub.4 reactors as a source of KCl. The "salting out" step eliminates an energy-intensive submerged combustion evaporation step from the K.sub.2 SO.sub.4 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/sylvinite ore refining cycle to inhibit undesirable glaserite formation. The sodium and potassium salts obtained from evaporation can be recycled to the "salting out" step.

REFERENCES:
patent: 1302937 (1919-05-01), Leonis
patent: 1354642 (1920-10-01), Anderson et al.
patent: 2684285 (1954-07-01), Dancy
patent: 3429657 (1969-02-01), George et al.
patent: 3440023 (1969-04-01), Hoppe et al.
patent: 3910773 (1975-10-01), Garrett et al.

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