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Use of ozone in the treatment of cyanide
containing effluents The
treatment of effluents of the gold and silver cyanidation process is one of the main
problems that the precious metals industry faces. These effluents contain variable
quantities of free cyanide, weak complexed cyanide, strong complexed cyanide and
thiocyanate. Different methods are used for the removal of cyanide but most of the times
the consumption of reagents raises the operation cost to unaffordable levels, and there
exists as well the possible formation of residual by-products that are also toxic. Ozone
is an alternative gas for oxidation of cyanide compounds that presents several advantages;
however the lack of information on the reactions of these compounds with ozone has delayed
its industrial application in the treatment of cyanidation effluents |
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