(1. 廣州有色金屬研究院，廣州 510651；
2. 萬(wàn)寶礦產(chǎn)有限公司，北京 100053；
3. 稀有金屬分離與綜合利用國(guó)家重點(diǎn)實(shí)驗(yàn)室，廣州 510651；
4. 中南大學(xué) 資源加工與生物工程學(xué)院，長(zhǎng)沙 410083)
摘 要: 通過(guò)浮選實(shí)驗(yàn)、吸附量測(cè)定、紅外光譜分析、XPS測(cè)試和浮選溶液化學(xué)計(jì)算研究Pb2+活化苯甲羥肟酸浮選黑鎢礦作用機(jī)理。結(jié)果表明：Pb2+可明顯活化苯甲羥肟酸浮選黑鎢礦，pH值為6~10時(shí)，黑鎢礦都保持較好的可浮性，pH值為9時(shí)浮選回收率最高；Pb2+促進(jìn)苯甲羥肟酸在黑鎢礦表面的吸附，且很好地符合Freundlich吸附等溫方程；黑鎢礦表面主要活性質(zhì)點(diǎn)為Mn2+；pH值為9時(shí)Mn2+的主要存在形式是界面氫氧化錳沉淀，苯甲羥肟酸與之發(fā)生“O,O”螯合生成羥肟酸金屬鹽。
關(guān)鍵字: 苯甲羥肟酸；黑鎢礦；鉛離子；浮選；活化機(jī)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
