工程科学学报，第41卷，第10期：1274-1279,2019年10月 Chinese Journal of Engineering,Vol.41,No.10:1274-1279,October 2019 D0I:10.13374/j.issn2095-9389.2018.09.04.003:http:/journals.ustb.ed.cn 铅离子对苯乙烯膦酸浮选锡石的活化作用 李艳军，刘畅四，刘杰，宫贵臣 东北大学资源与土木工程学院，沈阳110819 ☒通信作者，E-mail:reliuchang@163.com 摘要通过单矿物浮选试验揭示了P%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、Zta 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2+的活化作用机理.单矿物试验结果表明：在 矿浆pH为2.0-8.0的区间内P弘2·对锡石的浮选具有明显的活化作用，矿浆pH为4.0时锡石的回收率最高，达到93.78%， 与不存在P%2·的情况相比提高了5.33%.Zta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Zta电位负移，P2·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：Pb2·可 以与锡石表面的Sn+发生置换，PbOH·能够与锡石表面的S-0H发生相互作用形成以Sn-O-Ph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，使得苯乙烯腾酸在锡石表面的吸附量增多，导致了锡石的活化. 关键词锡石；苯乙烯膦酸：铅离子：浮选：活化机理 分类号TD952 Activation effect of Pb2*in cassiterite flotation with styrene phosphonic acid as collector LI Yan-jun,LIU Chang,LIU Jie,GONG Gui-chen College of Resource and Civil Engineering,Northeastern University,Shenyang 110819,China Corresponding author,E-mail:reliuchang@163.com ABSTRACT 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 Pb2'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 Pbin cassiterite flotation when styrene phos- phonic acid is used as a collector is revealed by single mineral flotation tests.The activation mechanism of Pb2+in the process of sty- rene 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 Pb2'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 Pb2.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 Pbcan promote the adsorption of styrene phosphonic acid on the cassiterite surface,making the zeta potential of the surface lower.Moreover,the Sn'on the cassiterite surface can be replaced with Pb2and the hydrolyzed species PbOH'in solutions can interact with Sn-OH on the surface to form the surface complex Sn-0-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. KEY WORDS cassiterite;styrene phosphonic acid;Pb2;flotation;activation mechanism 收稿日期：2018-09-04 基金项目：国家自然科学基金资助项目(51674066)工程科学学报,第 41 卷,第 10 期:1274鄄鄄1279,2019 年 10 月 Chinese Journal of Engineering, Vol. 41, No. 10: 1274鄄鄄1279, October 2019 DOI: 10. 13374 / j. issn2095鄄鄄9389. 2018. 09. 04. 003; http: / / journals. ustb. edu. cn 铅离子对苯乙烯膦酸浮选锡石的活化作用 李艳军, 刘 畅苣 , 刘 杰, 宫贵臣 东北大学资源与土木工程学院, 沈阳 110819 苣通信作者, E鄄mail: reliuchang@ 163. com 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 pH 为 2郾 0 ~ 8郾 0 的区间内 Pb 2 + 对锡石的浮选具有明显的活化作用,矿浆 pH 为 4郾 0 时锡石的回收率最高,达到 93郾 78% , 与不存在 Pb 2 + 的情况相比提高了 5郾 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 Sn 4 + 发生置换,PbOH + 能够与锡石表面的 Sn鄄鄄OH 发生相互作用形成以 Sn鄄鄄O鄄鄄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. 关键词 锡石; 苯乙烯膦酸; 铅离子; 浮选; 活化机理 分类号 TD952 收稿日期: 2018鄄鄄09鄄鄄04 基金项目: 国家自然科学基金资助项目(51674066) Activation effect of Pb 2 + in cassiterite flotation with styrene phosphonic acid as collector LI Yan鄄jun, LIU Chang 苣 , LIU Jie, GONG Gui鄄chen College of Resource and Civil Engineering, Northeastern University, Shenyang 110819, China 苣Corresponding author, E鄄mail: reliuchang@ 163. com ABSTRACT 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 phos鄄 phonic acid is used as a collector is revealed by single mineral flotation tests. The activation mechanism of Pb 2 + in the process of sty鄄 rene 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郾 0 ~ 8郾 0, and at a pH of 4郾 0, the recovery rate of cassiterite reaches maximum, 93郾 78% , which is 5郾 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鄄鄄OH on the surface to form the surface complex Sn鄄鄄O鄄鄄 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. KEY WORDS cassiterite; styrene phosphonic acid; Pb 2 + ; flotation; activation mechanism