Process for reducing losses of mercury in the alkali metal...

Details Process for reducing losses of mercury in the alkali metal... Process for reducing losses of mercury in the alkali metal...

C - Chemistry, Metallurgy

25

B

204/43.2

C25B 15/08 (2006.01) C25B 1/36 (2006.01) C25C 7/06 (2006.01)

Patent

CA 1123371

ABSTRACT OF THE DISCLOSURE Brine (aqueous solution of alkali metal chlorine) which is electrolyzed according to the amalgamation process, generally contains small amounts of mercury. It has been found that these traces of mercury are entrained to a considerable extent with evaporated water when evaporation cooling is applied to the brine. In order to keep these losses as low as possible, the pH is adjusted to a value of from 7 to 9.8 and the redox potential is adjusted to a vlaue of from 800 to 1100 mV (based on the potential of the hydrogen electrode) by adding chlorine or alkali metal hypochlorite and optionally alkali metal hydroxide to the brine.

311401

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