难沉降钨矿选矿废水处理研究

钨矿选矿过程中加入了大量的水玻璃和油酸，造成废水中残留大量水玻璃，使废水呈现黏稠的胶状，悬浮物难以沉降。目前国内外关于选矿废水处理的研究大多集中在选矿废水中有机选矿药剂的降解和重金属离子的去除，而对难沉降胶体的去除主要以传统的混凝剂聚合氯化铝（PAC）为主。本研究对不同的絮凝剂和助凝剂进行筛选组合并优化实验参数，使处理后选矿废水达到选矿用水水质要求。实验结果表明:基于实际选矿废水水质调研配制的模拟选矿废水pH值为1226，浊度为1 390 NTU，悬浮物（SS）为2 780 mg/L，Zeta电位为-59.9 mV；优化絮凝剂氯化钙（CaCl2）的投加量为500 mg/L，助凝剂1 500万分子量阳离子型聚丙烯酰胺（PAM）的投加量为30 mg/L，450 r/min快速搅拌反应5 min，160 r/min慢速搅拌2 min后静置沉淀20 min，则上清液浊度为7.11 NTU，浊度去除率高达99.48%。

Study on treatment of difficult settling wastewater from tungsten mineral processing

Large amount of water glass and oleic acid added to the tungsten ore mineral processing resulted in high concentration of water glass residual in the flotation wastewaterThus，the flotation wastewater was gelatinous and it was difficult for the suspended substance to settleResearches at home and abroad about flotation wastewater treatment are focused on the removal of organic mineral process reagent and heavy metalIn the practical mineral flotation wastewater treatment project，polyaluminium chloride（PAC） was generally used as coagulant to remove the suspended substance which was difficult to settleThis paper screened and combined the different coagulant and coagulant aid，meanwhile optimized the experimental parameters to improve the effluent quality and meet the reusable water quality standard requirementsThe experimental results showed the prepared simulated flotation wastewater based on the investigation of actual flotation wasterwater quality had the characteristics as follows:pH was 1226，turbidity was 1 390 NTU，suspended substance was 2 780 mg/L，Zeta potential was -59.9 mV. Calcium chloride（CaCl2） and 15 million molecular weight cationic polyacrylamide（PAM） were selected as the optimum coagulant and coagulant aid，the dosage was 500 mg/L and 30 mg/ L respectivelyUnder the experimental conditions of 450 r/min rapid stirring for 5 min，160 r/min slow stirring for 2 min，followed by settlement for 20 min，the turbidity of the supernatant was 7.11 NTU and the removal rate could reach 99.48%