混凝沉淀处理钼矿选矿废水的试验研究

Experimental study on treatment of molybdenum ore processing wastewater by coagulation sedimentation

分别采用静置沉淀及FeCl3、Al2(SO4)3、AlCl3、聚合氯化铝混凝沉淀对河南某钼矿选矿废水进行处理,结果表明:静置沉淀时间达到80min时,上清液SS质量浓度可降至456mg/L;混凝沉淀试验采用体积分数1%的FeCl3溶液处理效果最好,投加量为160mg/L时,选矿废水出水COD质量浓度为32mg/L,SS质量浓度为38mg/L,Pb、Zn均未检出,满足污水综合排放一级标准。进一步采用体积分数1‰的PAM溶液作为助凝剂进行优化处理,投加量为12~16mg/L时,选矿废水出水COD质量浓度可降至12~14mg/L,SS质量浓度降至14mg/L。

Tests were conducted on the treatment of molybde- num ore processing wastewater from a molybdenum mine in Henan by static precipitation and FeCI3, Al2 （SO4） a, A1CI3 and a- luminium polyehlorid coagulation sedimentation. The results showed that with the static precipitation time up to 80 min, the mass concentration of supernatant SS could be reduced to 456 mg/L and FeC13 solution with 1 % volume fraction had the best result in the coagulation sedimentation tests. With the dosage be- ing 160 mg/L and the concentrations of COD and SS of the pro- cessing effluent being 32 mg/L and 38 mg/L respectively, Pb and Zn were not detected, which met the first grade of the national integrated wastewater discharge standard. When l^0volume frac- tion of polyacrylic amide（PAM） was used as coagulant aid for op- timized processing with the dosage of 12 ~ 16 mg/L, the mass concentrations of CODand SS in the processing effluent could be reduced to 12~14 mg/L and 14 mg/L respectively.