Removal of cyanide from aqueous streams

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

B - Operations, Transporting

09

C

B09C 1/02 (2006.01) C22B 11/08 (2006.01) C02F 1/28 (2006.01)

Patent

CA 2705912

This invention relates to a method of removing cyanide in the form of free cyanide (cyanide ions i.e. CN") and weak acid dissociable cyanide (WAD) from an aqueous stream. WAD is cyanide complexed with metals such as Cu. The method finds particular application in removing cyanide from a tail stream from a carbon in leach (CIL) mining operation. The method of the invention is carried out by contacting an aqueous stream containing cyanide with carbon, under conditions wherein the Eh (oxygen reduction potential (ORP) measured in mV) of the aqueous stream is 0 or above. Advantageously the pH of the solution is buffered to from 7 - 9.

L'invention concerne un procédé d'élimination de cyanure se présentant sous la forme de cyanure libre (ions cyanure ou CN') et de cyanure dissociable par des acides faibles (CNDAF) contenus dans un flux aqueux. Le CNDAF est du cyanure complexé à des métaux tels que Cu. Le procédé selon l'invention trouve une application particulière dans l'élimination de cyanure d'un courant de queue provenant d'une opération d'extraction minière par lixiviation au carbone. Le procédé selon l'invention consiste à mettre en contact un flux aqueux contenant du cyanure avec du carbone, dans des conditions dans lesquelles le Eh (potentiel d'oxydo-réduction mesuré dans mV) du flux aqueux est de 0 ou supérieur. Le pH de la solution est avantageusement tamponné entre 7 et 9.

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