Removal of cyanide from aqueous streams

Details Removal of cyanide from aqueous streams Removal of cyanide from aqueous streams

1992-07-14

1994-03-01

Dawson, Robert A.

Liquid purification or separation

Processes

Chemical treatment

204DIG13, 210904, C02F 172

Patent

active

052904555

ABSTRACT:
Cyanide present in aqueous streams, such as effluents from electroplating and gold mining operations is reduced or eliminated by contacting the cyanide-containing stream with oxygen and carbon dioxide in the presence of ferrous ions, nickelous ions or cobaltous ions. The oxygen may be provided by air or oxygen and the contacting is carried out until the pH of the aqueous stream is reduced to a value in the range of about 6 to 8 and preferably 6.5 to 7.5.

REFERENCES:
patent: 4537686 (1985-08-01), Borbely et al.
patent: 5015396 (1991-05-01), D'Orazio et al.

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