Method for recovering magnesium sulfate products from mixtures o

Details Method for recovering magnesium sulfate products from mixtures o Method for recovering magnesium sulfate products from mixtures o

1992-03-24

1994-01-25

Langel, Wayne

Chemistry: physical processes

Physical processes

Crystallization

23293R, 423170, 423554, C01F 540

Patent

active

052812421

ABSTRACT:
A simple, efficient and inexpensive method of purifying magnesium sulfate from mixtures of epsomite and halite. The method allows for the preparation of substantially pure magnesium sulfate products. The method generally involves heating a mixture of epsomite and halite to form clusters of lower hydrated magnesium sulfate crystals and subsequently applying slight pressure to the clusters so that they collapse to yield fine, less hydrated magnesium sulfate crystals which can then be easily separated from the comparatively coarse halite crystals. The less hydrated magnesium sulfate crystals can be recrystallized to provide highly purified epsomite which can then be dehydrated to provide kieserite or anhydrous magnesium sulfate.

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Fernadez-Lozano, J. A. "Recovery of Epsomite and Sylvite From Seawater Bittern by Crystallization." Fourth Symposium on Salt, Alan H. Coogan, The Northern Geological Society, Inc. Cleveland, Ohio, vol. 2, pp. 501-510 (1974).
Pavlik, A. et al., "Description and Operation of a High Capacity Evaporator for the Production of a Very Pure Chemical Grade Salt", Fifth International Symposium on Salt, pp. 335-339.

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