海藻酸钠-硫化钠在铜钼混合精矿浮选分离中的抑制研究

Study on the Inhibition of Sodium Alginate-sodium Sulfide in Flotation Separation of Copper-molybdenum Mixed Concentrate

针对铜钼分离过程中硫化钠用量过大的环保压力,以及抑制剂选择性差导致钼精矿指标达不到产品要求的问题,采用浮选试验、动电位测量、吸附量测定等方法,进行了海藻酸钠-硫化钠组合抑制剂分离铜钼的试验研究。浮选结果表明,以海藻酸钠+硫化钠为组合抑制剂,水玻璃和氟硅酸钠为调整剂、煤油为捕收剂,采用硫化钠+活性炭+再磨+硫化钠工艺对某铜钼混合精矿进行脱药处理后,1粗1扫4精闭路浮选工艺,可以获得钼品位为44.60%、钼回收率为94.84%的合格钼精矿。与单一硫化钠抑制剂方案相比,组合抑制剂工艺的硫化钠用量降低了约41%,取得了较好的环境和经济效益。动电位和吸附量分析表明,海藻酸钠与黄铜矿之间的亲和力强于辉钼矿,对黄铜矿浮选表现出较好的选择性抑制效果,是组合抑制剂提升分离效果的原因。

In view of the environmental protection pressure of excessive sodium sulfide dosage in the process of coppermolybdenum separation,and the problem that the molybdenum concentrate index can not meet the product requirements due to the poor selectivity of the inhibitor,the flotation test,dynamic potential measurement,adsorption capacity measurement and other methods were used to study the separation of copper and molybdenum by sodium alginate-sodium sulfide combined inhibitor.Flotation results show that with sodium alginate+sodium sulfide as combined inhibitors,sodium silicate and sodium fluosilicate as regulators,kerosene as collector,copper-molybdenum mixed concentrate is treated of reagent removal by sodium sulfide+activated carbon+regrinding+sodium sulfide process.After one roughing,one scavenging and four cleaning closed-circuit flotation process,qualified molybdenum concentrate with molybdenum grade of 44.60%and molybdenum recovery of 94.84%can be obtained.Compared with the single sodium sulfide inhibitor scheme,the sodium sulfide dosage of the combined inhibitor process is reduced by about 41%,and better environmental and economic benefits are achieved.The analysis of zeta potential and adsorption capacity shows that the affinity between sodium alginate and chalcopyrite is stronger than that of molybdenite,which shows a good selective inhibition effect on chalcopyrite flotation,which is the reason for the combined inhibitor to improve the separation effect.