镁离子强化水玻璃对石英抑制机理研究  

Mechanism of Magnesium Ion Strengthening the Depression of Sodium Silicate on Quartz

作　　者：李智宇 刘建[1,2] 高虎林 郝佳美 LI Zhiyu;LIU Jian;GAO Hulin;HAO Jiamei(Faculty of Land Resource Engineering,Kunming University of Science and Technology,Kunming 650093,Yunnan,China;Yunnan Key Laboratory of Green Separation and Enrichment of Strategic Mineral Resources,Kunming 650093,Yunnan,China)

机构地区：[1]昆明理工大学国土资源工程学院,云南昆明650093 [2]云南战略金属矿产资源绿色分离与富集重点实验室,云南昆明650093

出　　处：《矿产保护与利用》2024年第3期63-73,共11页Conservation and Utilization of Mineral Resources

基　　金：云南省基础研究专项重点项目(202301AS070033)。

摘　　要：氧化铅锌矿浮选中对于脉石矿物石英的抑制十分关键。在以十二胺为捕收剂的体系中,单独使用水玻璃对石英抑制效果较弱。因此,加强对作为脉石矿物石英的抑制研究具有重要意义。通过单矿物浮选实验、吸附量测试、Zeta电位分析、XPS检测和分子动力学模拟,研究了Mg^(2+)与水玻璃作为组合抑制剂对石英浮选行为的影响及其抑制机理。单矿物浮选实验结果表明Mg^(2+)与水玻璃组合使用对石英起到了强烈抑制作用,在pH=9.7、水玻璃用量为2×10^(-4)mol/L时,石英的回收率为90.15%,而添加了8×10^(-4)mol/L镁离子后石英的回收率仅为3.15%。Zeta电位分析、吸附量测定表明,与水玻璃相比,在Mg-水玻璃的作用下吸附在石英表面的十二胺降低了95%。XPS检测和浮选溶液化学表明,Mg^(2+)与溶液中的SiO(OH)3-反应生成离子聚合物以弱物理吸附的方式吸附在石英表面,阻碍捕收剂十二胺的吸附,从而实现对石英的抑制。分子动力学模拟表明,镁离子强化了水玻璃的抑制作用,十二胺在石英表面的相对浓度降低。因此,Mg-水玻璃组合抑制剂对石英的抑制作用更强。The depression of quartz is very important for the flotation of lead−zinc oxide ore.In the system with dodecylamine as the collector,the use of sodium silicate alone has a weaker depression effect on quartz.Therefore,it is of great significance to reinforce the research on the depression of quartz.The effect and depression mechanism of Mg^(2+)and sodium silicate as combined depressant on quartz flotation behavior were studied through single mineral flotation experiments,adsorption capacity tests,Zeta potential analysis,XPS detection,and molecular dynamics simulations.The single mineral flotation test showed that the combination of Mg^(2+)and sodium silicate had a strong depression effect on quartz.The recovery of quartz was 90.15%at pH=9.7 and sodium silicate dosage of 2×10^(−4)mol/L.While the recovery of quartz was only 3.15%after the addition of 8×10^(−4)mol/L Mg^(2+).Zeta potential analysis and adsorption capacity determination indicated that,compared to adding sodium silicate alone,the amount of DDA adsorbed on the surface of quartz decreased by 95%in the presence of Mg−sodium silicate.XPS measurements and flotation solution chemistry indicated that Mg^(2+)reacts with SiO(OH)3−in the solution to form an ionic polymer.The ionic polymer can weakly physically adsorbed on quartz surface and hinder the adsorption of the collector dodecylamine,thereby achieving depression of quartz.Molecular dynamics simulation showed that Mg^(2+)enhances the depression effect of sodium silicate,which makes the decrease of DDA concentration on the quartz surface.Therefore,the combined depressant Mg−sodium silicate has a stronger depression effect on quartz.

关 键 词：石英 Mg^(2+) 水玻璃 组合抑制剂 分子动力学模拟 

分 类 号：TD923.14[矿业工程—选矿]