铅离子对苯乙烯膦酸浮选锡石的活化作用  

Activation effect of Pb2+ in cassiterite flotation with styrene phosphonic acid as collector

作　　者：李艳军[1] 刘畅[1] 刘杰[1] 宫贵臣 LI Yan-jun;LIU Chang;LIU Jie;GONG Gui-chen(College of Resource and Civil Engineering,Northeastern University,Shenyang 110819,China)

机构地区：[1]东北大学资源与土木工程学院

出　　处：《工程科学学报》2019年第10期1274-1279,共6页Chinese Journal of Engineering

基　　金：国家自然科学基金资助项目(51674066)

摘　　要：通过单矿物浮选试验揭示了Pb^2+对苯乙烯膦酸(SPA)浮选锡石效果的影响规律,在此基础上,利用接触角测定、Zeta电位检测、红外光谱分析和浮选溶液化学研究了苯乙烯膦酸浮选锡石体系中Pb^2+的活化作用机理.单矿物试验结果表明:在矿浆p H为2.0~8.0的区间内Pb^2+对锡石的浮选具有明显的活化作用,矿浆p H为4.0时锡石的回收率最高,达到93.78%,与不存在Pb^2+的情况相比提高了5.33%.Zeta电位检测、红外光谱分析和浮选溶液化学结果表明:苯乙烯膦酸主要化学吸附于锡石表面,使锡石表面的Zeta电位负移,Pb^2+的作用促进了苯乙烯膦酸的吸附,进一步降低了锡石表面的Zeta电位;Pb^2+可以与锡石表面的Sn4+发生置换,Pb OH^+能够与锡石表面的Sn-OH发生相互作用形成以Sn-O-Pb^+形式存在的络合物,这些作用增加了锡石表面的活性位点数量,使得苯乙烯膦酸在锡石表面的吸附量增多,导致了锡石的活化.Metal ions have a very important influence on the flotation process of minerals,and some of them can activate minerals and thus yield an improvement in the flotation effect.Some production practices have shown that Pb^2+ has an activation effect in the process of cassiterite flotation,which can improve the rate of cassiterite recovery.Styrene phosphonic acid is the most commonly used collector in the production of cassiterite flotation.In this study,the activation effect of Pb^2+ in cassiterite flotation when styrene phosphonic acid is used as a collector is revealed by single mineral flotation tests.The activation mechanism of Pb^2+ in the process of styrene phosphonic acid collecting cassiterite is assessed by contact angle measurement,zeta potential determination,IR spectroscopy,and solution chemistry analysis.The results of single mineral flotation tests indicate that Pb^2+ can increase the floatability of cassiterite when the pH is 2.0~8.0,and at a pH of 4.0,the recovery rate of cassiterite reaches maximum,93.78%,which is 5.33%higher than the recovery rate without Pb^2+ .The results of zeta potential determination,IR spectroscopy,and solution chemistry analysis show that the styrene phosphonic acid can be adsorbed on the cassiterite surface in form of chemical adsorption,causing the zeta potential of the surface to shift toward the negative direction,and the Pb^2+ can promote the adsorption of styrene phosphonic acid on the cassiterite surface,making the zeta potential of the surface lower.Moreover,the Sn^4+ on the cassiterite surface can be replaced with Pb^2+ and the hydrolyzed species PbOH^+ in solutions can interact with Sn-OH on the surface to form the surface complex Sn-O-Pb^+,which may lead to an increase in the number of active sites on the cassiterite surface,promoting the adsorption of styrene phosphonic acid on the cassiterite surface and resulting in the activation of cassiterite.

关 键 词：苯乙烯膦酸 浮选溶液化学 Zeta电位 活化作用 单矿物浮选 红外光谱分析 铅离子 锡石 

分 类 号：TD952[矿业工程—选矿]