Treating remains containing sodium choride and sodium sulphate

Details Treating remains containing sodium choride and sodium sulphate Treating remains containing sodium choride and sodium sulphate

C - Chemistry, Metallurgy

01

D

23/172, 204/64.2

C01D 3/14 (2006.01) C01D 5/16 (2006.01) C25B 15/08 (2006.01)

Patent

CA 1060181

ABSTRACT Method of dissolving out a sodium sulphate component of a residual product obtained upon evaporation and cooling of a sodium hydroxide solution originating from a diaphragm electrolysis, the product occuring in form of a cristallised salt mixture containing sodium chloride and sodium sulphate. First of all residues of the sodium hydroxide are removed from the product. Thereafter the mixture of sodium chloride and sodium sulphate is so slurried in water and treated that a maximum of the sodium chloride and a first part of the sodium sulphate are dissolved up to a solution being saturated of said two components while a second part of the sodium sulphate and a possible rest of the sodium chloride remain suspended. Whereafter the suspended solid substance is then separated from the sodium chloride-sodium sulphate mother brine.

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