Decomposition of amalgam from electrolysis and anodic...

Details Decomposition of amalgam from electrolysis and anodic... Decomposition of amalgam from electrolysis and anodic...

C - Chemistry, Metallurgy

25

B

204/43.4

C25B 1/42 (2006.01) C25B 1/36 (2006.01)

Patent

CA 1122561

ABSTRACT OF THE DISCLOSURE An improved process for the production of halogens and alkali metal hydroxide by electrolysis of aqueous solution-of alkali metal halides in a flowing mercury electrolysis cell wherein the salt solutions do not have to be purified. The process comprises subjecting the amalgam leaving the electrolysis to decomposition to form mercury and an alkali metal hydroxide solution and subjecting the mercury to anodic polarization in an electrolyte with a counter-electrode maintained at a sufficiently negative potential to remove from the mercury at least a portion of metal impurities contained therein and recycling the purified mercury to the electrolysis cell. The metal impurities in the mercury are preferentially anodically dissolved in the electrolyte so that the level of impurities in the mercury will be held below the levels which would adversely affect the electrolytic reaction taking place in the electrolysis cell.

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