Hydrogen peroxide (H2O2) oxidizes free and weakly-complexed cyanide in a one-step reaction to yield cyanate. Metals such as copper are precipitated simultaneously as hydroxides. CN- + H2O2 → OCN- + H2O………………………………………………………….(1) 2 Cu(CN)3²- + 7H2O2 + 2OH- → 6OCN- + 2Cu(OH)2 + 6H2O…………………………………..(2) The strongest metal-cyanide complexes commonly encountered in the effluents from gold and … Read more