Abstract:The tailings wastewater from a lead-zinc concentrator in Inner Mongolia contains high residual diethyldithiocarbamate, butyl xanthate, PH, CODcr, metal ions and turbidity, which affects the separation of lead-zinc minerals and the pollution of ecological environment. In practice, the process of "flocculation-sedimentation electrocatalytic oxidation ultrafiltration" is adopted to improve the water quality, but the removal rate of CODcr is low. In order to further purify lead-zinc mineral processing wastewater, Fenton oxidant method was used instead of electrocatalytic oxidation method to reduce CODcr. The effects of oxidant type, reagent conditions and dosage on the results were investigated. Under the conditions of pH = 9.0, 18 × 10-3mol / L H2O2 and 300ppm FeSO4.7H2O, CODcr decreased from 461.1mg/l to 128.7mg/l, and the removal rate reached 72.09%. Considering the effectiveness and economy of the process, Fenton oxidant method instead of electrocatalytic oxidation method can obviously improve the removal rate of CODcr and realize the purification and recycling of lead-zinc mineral processing wastewater.