| The cyanide gold slime refining wastewater of Shandong Gold Smelting Co. Ltd was treated by iron powder replacement method. The effects of iron powder dosage, replacement time, reaction temperature and pH value on the replacement rate of gold and silver were investigated. The obtained optimum replacement conditions are: maintaining iron powder dosage of 2.5 kg/m3, reaction temperature of 60℃，pH value of 0.5, and reaction time of 30 min. The replacement rates under the optimum conditions are above 95% and 97% for gold and silver, respectively. The sliver replacement rate can reach over 98% in the industrial application. Compared with zinc powder replacement method, the iron powder replacement method has high replacement rate, low cost and good production environment advantages, and its economic benefits are obvious. |
