Liquid purification or separation – Processes – Chemical treatment
Patent
1990-09-11
1991-05-14
Silverman, Stanley
Liquid purification or separation
Processes
Chemical treatment
210904, 204DIG13, 75737, C02F 172, C02F 158
Patent
active
050153960
ABSTRACT:
Cyanide present in aqueous streams, such as effluents from electroplating and gold mining operations is reduced or elliminated by contacting the cyanide-containing stream with oxygen and carbon dioxide in the presence of cupric ions. The oxygen may be provided by air or oxygen and the contacting is carried out at 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. Cupric sulfate has been found to be particularly effective for the described reaction.
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M. D. Gurol and T. E. Holden, "The Effect of Copper and Iron Complexation on Removal of Cyanide by Ozone", Ind. Eng. Chem. Res. 1988, vol. 27, No. 7, 1988, pp. 1157-1162.
The McCoy Scoop, Edition 11, May 1990.
D'Orazio Robert P.
Rakszawski John F.
McCarthy Neil M.
Pearlman Robert I.
Reap Coleman R.
Silverman Stanley
The BOC Group Inc.
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