Study on the Infiltrate in Gold Smelting Residue with Two-step Oxidation and Fenton Reagent
In order to solve the difficult problem of treating the infiltrate in gold smelting residue,the "two-step oxidation with Fenton reagent" is used to treat it.The results indicated that the sodium hypochlorite is more efficient than the calcium hypochlorite in the two-step oxidation process.With the conditions that the molar ratio of the available chlorine to the cyanide is 4.5∶1 in the first oxidation process,the ratio 8∶1 in the second oxidation process,25 minutes reaction time both in the two oxidation process,and the hydrogen peroxide dosage of 3.0 mL/L,iron sub-sulfate dosage of 2 g/L and 70 minutes reaction time,97.9% cyanide,67.7% COD and almost all of the copper ion can be removed,the effluent could match the national discharge standard GB8978.