关键词: 铅锌选矿废水, 氧化—混凝, 超声波, S^2-去除率

Abstract: Due to the excessive sulfide in wastewater discharged from large-scale lead-zinc dressing plant，the ultrasound-assisted oxidation-coagulation sedimentation method was used to find out the S^2- removal effect with the variation of the type and dosage of the oxidant，the coagulant's type and dosage and the reaction time of ultrasonic.The results showed that: at room temperature，with addition of the oxidant H₂O₂ of 20 mg/L，and the coagulant FeSO₄ dosage of 150 mg/L，coagulant-assisted polyacrylamide of 1.0 mg/L，under the assistance of ultrasonic wave at 20 min stirring，S^2- ion removal rate could reach above 95%，and its content can be reduced to 0.14 mg/L below，which leads to the wastewater quality reach the national emission standards.

Key words: Wastewater from lead-zinc beneficiation, Oxidation-coagulation, Ultrasonic wave, S^2- removal rate