超声波辅助去除铅锌选矿外排废水中的硫化物

针对广东韶关某大型铅锌矿选矿外排废水中超标的硫化物，采用超声波辅助下的氧化-混凝沉淀法对其进行去除试验，探讨了氧化剂种类和用量、混凝剂种类和用量及超声波辅助反应时间对S^2-去除效果的影响。结果表明：在常温下向该废水中加入用量为20 mg/L的氧化剂H₂O₂，用量为150 mg/L的混凝剂FeSO₄和用量为1.0mg/L的助凝剂聚丙烯酰胺，在超声波辅助下搅拌反应20 min，S^2-离子的去除率可达到95%以上，含量可降到0.14 mg/L以下，废水水质达到国家排放标准。

Sulphide Removal from Wastewater of Zinc-lead Beneficiation with the Assistance of Ultrasonic Wave

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.