Treatment of water containing cyanide

Details Treatment of water containing cyanide Treatment of water containing cyanide

1975-10-15

1977-06-14

Prescott, Arthur C.

Chemistry: electrical and wave energy

Processes and products

Electrostatic field or electrical discharge

204130, C02C 512, C02B 182

Patent

active

040295575

ABSTRACT:
Sodium chloride is added to water which is then passed through at least one electrolytic cell. There, electrolysis of the sodium chloride produces chlorine molecules and sodium hydroxide. The water is then flowed into the presence of metal-cyanide contaminants. The chlorine and caustic immediately react with the metal-cyanide compounds to produce metal hydroxide precipitates, while the cyanide is decomposed and liberated from the water in carbon dioxide and gaseous nitrogen. As part of this reaction, the sodium chloride is reformed, so that the same brine can be recycled and the process repeated without further additives. The optimum pH of between 7 and 8 may be maintained as needed by addition of small amounts of hydrochloric acid to the system.

REFERENCES:
patent: 892486 (1908-07-01), Woolf
patent: 2737298 (1956-03-01), Hendel
patent: 3361663 (1968-01-01), Murray et al.

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