Separation of metallic and cyanide ions from electroplating solu

Details Separation of metallic and cyanide ions from electroplating solu Separation of metallic and cyanide ions from electroplating solu

1986-06-25

1988-06-21

Cintins, Ivars

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210750, 210766, 210904, B01D 1900

Patent

active

047524006

ABSTRACT:
A method of removal of cyanide and metal ions from electroplating waste waters is described. The cyanide, as hydrogen cyanide, is purged with air and then absorbed efficiently in 1.5% sodium hydroxide solution. The purge is effected by dispersing air bubbles in the waste water after adjusting the pH of the water to one within the range of from 4 to 6.5. The cyanide ions are converted to hydrogen cyanide and entrained in the air bubbles for transport to a separate vessel for absorbtion in the sodium hydroxide solution. The apparatus employed is a closed system to avoid the hazards associated with hydrogen cyanide.

REFERENCES:
patent: 897735 (1908-09-01), Goldberg
patent: 2640807 (1953-06-01), Rice
patent: 3592586 (1971-07-01), Scott
patent: 4321145 (1982-03-01), Carlson

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