钽铌矿冶炼铁泥制备聚硅酸硫酸铁及其应用

Preparation of Polyferric Silicate Sulfate Using Iron Mud from Tantalum and Niobium Ore Smelting and its Application

以Fenton法处理钽铌冶炼废水产生的铁泥为原料,制备了聚硅酸硫酸铁（PFSS）絮凝剂.研究了PFSS的制备工艺条件、PFSS投加量、废水的pH值和搅拌时间对PFSS絮凝性能的影响.结果表明,当制备工艺条件中的SiO2质量分数w（SiO2）为1.00%,A,B混合液pH值为3.00,n（Fe）∶n（Si）为1∶1,活化温度为40℃,活化时间为2 h时,得到的PFSS具有最好的絮凝性能.用PFSS絮凝剂处理钨铋选矿废水,PFSS投加量为废水体积分数0.10%,废水pH值为7.00,搅拌2 min后,废水浊度去除率达99.9%,COD去除率达77.8%;废水中Pb和As去除率分别达99.0%和97.4%,Be去除率几乎达100%.处理后废水浊度为0.32 NTU,COD含量降至72.2 mg/L,废水中Pb和As质量浓度分别降至0.08和0.03 mg/L,Be未检出.处理后废水达到GB 8979-1996一级排放标准.

Poly-ferric silicate sulfate（PFSS） flocculant was prepared using iron mud as raw material from tantalum and niobium smelting wastewater treated by Fenton process. The effects of the preparative technological conditions of PFSS,PFSS dosage,pH value of the wastewater and stirring time on the flocculent property of PFSS were studied. The results showed that the optimum preparative technological conditions of PFSS are as follows：SiO2 mass fraction w（SiO2） is 1.00%,pH value in A and B mixed liquid is 3.00,n（Fe） ： n（Si） is 1︰1,activation temperature is 40 ℃ and activation time is 2 h. PFSS prepared in the optimum preparative technological conditions has the best flocculent property. W and Bi dressing wastewater is treated by PFSS using wastewater volume percentage 0. 10% of PFSS in the condition of pH value 7. 00 and stirring time 2 min,the removal rate of wastewater turbidity and COD are 99. 9% and 77. 8%,respectively,and those of Pb and As in wastewater are 99.0% and 97.4%,respectively,while that of Be is almost 100%. The residual concentrations of turbidity and COD in wastewater are only 0.32 NTU and 72.2 mg/L,respectively,while those of Pb and As are 0. 08 and 0.03 mg/L and that of Be is below the detection limit. After W and Bi dressing wastewater is treated by PFSS,the quality of wastewater from meet the first level of discharge standard of GB 8979-1996.