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本文以Fenton试剂法处理钽铌冶炼废水产生铁泥作为聚硅酸硫酸铁制备铁源,在不同的ω(SiO2)、pH值、n(Fe)/n(Si)条件下优化制备了聚硅酸硫酸铁絮凝剂,并进行钨铋多金属矿选矿废水及高浊度模拟废水处理.研究结果表明:在ω(SiO2)=1.00％、pH=3.00、n(Fe):n(Si)=1∶1的适宜条件下制得的聚硅酸硫酸铁絮凝剂效果最佳.在0.10％(体积分数)投加量下搅拌2 min,钨铋选矿废水浊度去除率达99.9％,COD去除率达76.8％,废水中Pb和As去除率分别达98.8％和97.2％,Be去除率几乎达100％,处理后废水浊度由319 NTU降至0.32 NTU、COD含量由322 mg·L-1降至74.7 mg·L-1,废水中Pb和As质量浓度分别由7.89、1.03 mg· L-1降至0.09、0.03 mg·L-1,未检出Be;高浊度模拟废水浊度去除率达98.5％,浊度由716 NTU降至10.7 NTU.处理后废水达到《污水综合排放标准》(GB 8979-1996)一级标准.

Poly-ferric silicate sulfate was prepared with Fenton reagents using iron sludge from Ta and Nb smelting wastewater,and the preparation condition was optimized by using different ω (SiO2),pH values and n (Fe)/n (Si).The treatment of wastewater from W and Bi containing multimetal ore dressing process and that from high turbidity containing bentonite was then carried out using the poly-ferric silicate sulfate.The results showed that the optimized condition of poly-ferric silicate sulfate preparation were ω(SiO2)=1.00％,pH=3.00,n(Fe):n(Al)=1∶1.When 0.10％ (volume ratio) of poly-ferric silicate sulfate was added to the wastewater from W and Bi containing multi-metal ore dressing process,the removal rratio was 99.9％ for the turbidity after 2 min,76.8％,for COD,98.8％ and 97.2％ for Pb and As,and almost 100％ for Be.The concentrations of turbidity and COD in wastewater decreased from 319 NTU and 322 mg·L-1 to 0.32 NTU and 74.7 mg·L-1,while those of Pb and As decreased from 7.89 mg·L-1 and 1.03 mg·L-1 to 0.09 mg·L-1 and 0.03 mg·L-1 and Be was below the detection limit,respectively.When 0.10％ (volume ratio) of poly-ferric silicate sulfate was added to the high turbidity simulated wastewater containing bentonite,the removal rate of turbidity exceeded 98.5％ after 2 min,and the conccntration decreased from 716 NTU to 10.7 NTU.After coagulation,the quality of wastewater from W and Bi containing multimetal ore dressing process and that of high turbidity containing bentonite both meet the first grade of the National Integrated Wastewater Discharge Standard (GB 8978-1996).