Production of ultra pure salt

Details Production of ultra pure salt Production of ultra pure salt

C - Chemistry, Metallurgy

01

D

C01D 3/04 (2006.01) C01D 3/14 (2006.01) C25B 15/08 (2006.01)

Patent

CA 2438995

This invention relates to methods and installations for producing ultra pure sodium chloride salt cyrstals primarily for use in saturating depleted brine resulting from the electrolytic decomposition of saturated brine in chlor alkali membrane cells for the production of chlorine, caustic soda and hydrogen. More particularly, this invention relates to the production of ultra pure sodium chloride salt crystals by processing primary treated brine by first acidifying the primary treated brine, then stripping the carbonic acid produced by acidification as carbon dioxide, and then returning the brine to a pH of about 6 or higher which is sufficient for processing it in evaporation equipment where the ultra pure salt crystals are produced.

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