(1. 广州有色金属研究院，广州 510651；
2. 万宝矿产有限公司，北京 100053；
3. 稀有金属分离与综合利用国家重点实验室，广州 510651；
4. 中南大学 资源加工与生物工程学院，长沙 410083)
摘 要: 通过浮选实验、吸附量测定、红外光谱分析、XPS测试和浮选溶液化学计算研究Pb2+活化苯甲羟肟酸浮选黑钨矿作用机理。结果表明：Pb2+可明显活化苯甲羟肟酸浮选黑钨矿，pH值为6~10时，黑钨矿都保持较好的可浮性，pH值为9时浮选回收率最高；Pb2+促进苯甲羟肟酸在黑钨矿表面的吸附，且很好地符合Freundlich吸附等温方程；黑钨矿表面主要活性质点为Mn2+；pH值为9时Mn2+的主要存在形式是界面氢氧化锰沉淀，苯甲羟肟酸与之发生“O,O”螯合生成羟肟酸金属盐。
关键字: 苯甲羟肟酸；黑钨矿；铅离子；浮选；活化机理
（1. Guangzhou Research Institute of Non-ferrous Metals, Guangzhou 510651, China;
2. Wanbao Mining Limited, Beijing 100053, China;
3. State Key Laboratory of Rare Metals Separation and Comprehensive Utilization, Guangzhou 510651, China;
4. School of Resources Processing and Bioengineering, Central South University, Changsha 410083, China）
Abstract:The activation mechanism of Pb2+ in flotation of wolframite with benzohydroxamic acid as collector was studied through flotation test, adsorptive capacity, IR spectroscopy, XPS study and flotation chemistry calculation. The results show that Pb2+ can increase the floatability of wolframite and the optimum pH region is 6-10, the floatation recovery rate reaches maximum when pH=9; the adsorption test shows Pb2+ can promote the adsorption of benzohydroxamic acid onto the surface of wolframite, and the adsorption isotherm obeys Freundlich equation quite well; tthe result of XPS study shows the main activity of species is Mn2+, and the floatation chemistry reveals the majority of Mn2+ exists as surface manganese hydroxide; two oxygen atoms from hydroxamate anion chelate manganese hydroxide on the surface of wolframite and form five- chain complex.
Key words: benzohydroxamic acid; wolframite; Pb2+; flotation; activation mechanism
