Chemistry: electrical and wave energy – Processes and products – Electrostatic field or electrical discharge
Patent
1978-05-05
1979-04-17
Andrews, R. L.
Chemistry: electrical and wave energy
Processes and products
Electrostatic field or electrical discharge
204 99, C25C 116
Patent
active
041499433
ABSTRACT:
Disclosed is a method of operating an electrolytic cell of the flowing mercury amalgam cathode type. According to the disclosed process, fortified alkali metal chloride brine is fed to the cell while an electrical current is passed through the cell. Depleted brine, diminished in alkali metal chloride content and enhanced in mercury content, is recovered from the cell. The depleted brine is dechlorinated and then refortified with alkali metal chloride. Thereafter, the refortified brine is treated to precipitate sulfate and alkaline earth metal contaminates as well as mercury. The purified, refortified brine is then introduced to a flowing mercury amalgam cathode electrolytic cell. The mercury recovery process is characterized by adding an alkaline hypochlorite solution to the precipitated impurities in order to form a soluble mercury salt, separating the soluble mercury salt from the precipitate at an alkaline pH, and then acidifying the solution of the soluble mercury salt. Thereafter, the mercury salt solution is electrolyzed between an anode and a cathode in order to evolve metallic mercury at the cathode.
REFERENCES:
patent: 2860952 (1958-11-01), Bergerow et al.
patent: 3115389 (1963-12-01), Deriaz
patent: 3647359 (1972-03-01), Bell
patent: 3691037 (1972-09-01), Updyke
patent: 3801480 (1974-04-01), Krieg
patent: 4012297 (1977-03-01), Balko et al.
Andrews R. L.
Goldman Richard M.
PPG Industries Inc.
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