Chemistry: physical processes – Physical processes – Crystallization
Patent
1980-11-06
1983-11-01
Bernstein, Hiram H.
Chemistry: physical processes
Physical processes
Crystallization
B01D 902
Patent
active
044128380
ABSTRACT:
Potassium chloride of at least technical grade is recovered from sylvinite or sylvinite-like starting materials (sylvite) by leaching with hot mother liquor recycled from a crystallizing stage, the residue consisting substantially of sodium chloride is separated and the solution is cooled to crystallize the potassium chloride. In order to avoid losses to potassium chloride and to reduce problems relating to equipment materials in separating water-insoluble impurities the finely ground starting materials are treated at ambient temperatures with a solution which is saturated with sodium chloride and potassium chloride, and water-soluble impurities are entrained with the solution. The solution is then separated from the water-insoluble impurities and is recycled at least in part to produce the pulp. The moist salt mass resulting from the separation consists substantially of potassium chloride and sodium chloride and is contacted with a solution which comes from the crystallizing stage and is saturated with sodium chloride and potassium chloride. The solution enriched with potassium chloride is separated from the residue, which contains mainly sodium chloride, and the separated solution is virtually saturated with potassium chloride by the addition of potassium chloride and is crystallized.
REFERENCES:
patent: 1182668 (1916-05-01), Firebargh
patent: 2188932 (1940-02-01), Weinig
patent: 2448191 (1948-08-01), Pike
patent: 2927010 (1960-03-01), Le Baron
patent: 3910773 (1975-10-01), Garrett
Ertl Dietrich
Ueberle Dieter
Bernstein Hiram H.
Dubno Herbert
Metallgesellschaft Aktiengesellschaft
Ross Karl F.
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