Process for producing salt having a reduced calcium sulfate...

Details Process for producing salt having a reduced calcium sulfate... Process for producing salt having a reduced calcium sulfate...

C - Chemistry, Metallurgy

01

D

23/172, 161/32

C01D 3/06 (2006.01) B01D 9/00 (2006.01) C01D 3/14 (2006.01)

Patent

CA 1071842

A B S T R A C T Process for preparing from brine containing appreciable quantities of dissolved calcium sulfate a high purity salt product having an exception- ally low calcium sulfate content. The process achieves a low calcium sulfate content by crystallizing the salt from a brine to which an alkali metal polysphsphate has been added whereby co-precipitation of calcium sulfate with the salt is prevented. The final evaporation and precipitation of salt can be carried out either in a sealed chamber under vacuum or in a solar pond. In both cases a continuous "feed and bleed" procedure is used. Where high purity dendritic salt is desired, alkali metal ferrocyanide is added to the brine as well as alkali metal polyphosphate.

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