袁 航,何廷树,李 慧,王宇斌.Ca2 在粗细粒辉钼矿表面吸附及对可浮性影响[J].有色金属工程,2019,9(8):.
Ca2 在粗细粒辉钼矿表面吸附及对可浮性影响
Adsorption of Ca2 on the surface of coarse-fine molybdenum ore and its effect on floatability
投稿时间:2018-08-14  修订日期:2018-09-15
DOI:
中文关键词:  辉钼矿  表面吸附  可浮性  XPS分析
英文关键词:molybdenite ore  surface adsorption  floatability  XPS analysis
基金项目:国家自然科学基金资助项目(51674184),磁化改性提高低温环境下尾矿废水回用的辉钼矿浮选效果研究;国家自然科学基金项目(面上项目,重点项目,重大项目)
           
作者单位
袁 航 西安建筑科技大学 材料与矿资学院
何廷树 西安建筑科技大学 材料与矿资学院
李 慧 西安建筑科技大学 材料与矿资学院
王宇斌 西安建筑科技大学 材料与矿资学院
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中文摘要:
      为了探明Ca2 对粗细粒辉钼矿浮选行为和吸附特性的影响进行了研究。通过纯矿物浮选试验,结合Zeta电位测试、Ca2 溶液化学分析、XPS等手段探讨了Ca2 在粗细粒辉钼矿表面吸附对可浮性的影响。矿浆中Ca2 会明显恶化辉钼矿的浮选效果,且对细粒级影响更加明显;在浓度为1.0×10-2 mol/L Ca2 溶液体系中,pH<12.39时,主要以钙离子和羟基钙离子形式存在,排除了由于Ca(OH)2沉淀罩盖纯矿物表面造成辉钼矿回收率下降的影响因素;经Ca2 作用过的辉钼矿表面电位绝对值显著变小,证明Ca2 在辉钼矿表面发生了较强的吸附。此外,由XPS谱图分峰处理结果得到细粒级辉钼矿表面Ca-MoO4相对含量较粗粒高出1.15倍。钙离子对细粒辉钼可浮性矿恶化更加明显,是由于Ca2 在辉钼矿“棱”面发生了化学吸附反应,在其表面形成CaMoO4亲水薄膜,降低了矿物可浮性。
英文摘要:
      In order to find out the effect of Ca2 on the flotation behavior and adsorption characteristics of coarse-fine molybdenite. The mechanism of Ca2 and coarse-fine molybdenite was explored by means of pure mineral flotation tests combined with Zeta point test, Ca2 solution chemical and XPS analysis. The results show that the Ca2 in ore slurry will significantly weaken the molybdenite flotation effect, and the influence of fine grain is more obvious;In the concentration of 1.0x10-2mol/L Ca2 solution, when pH<12.39, it exists mainly in the form of calcium ion and calcium hydroxide ion,Further exclusion of the factors affecting the decrease of molybdenum recovery due to Ca(OH)2 sedimentation on the surface of pure minerals;The absolute value of the surface potential of molybdenite that has been treated with Ca2 has become significantly smaller, demonstrating that Ca2 has a strong adsorption on the molybdenite surface. In addition, the peak content of Ca-MoO4 on the surface of fine-grained molybdenite was 1.15 times higher than that of coarse particles by the peak separation treatment of XPS spectrum. Compared with the coarse particles, the calcium ions are more obvious for the reduction of the floatable ore of the fine particles of molybdenite. It is due to the chemical adsorption of Ca2 on the “edge” surface of molybdenite,forming a hydrophilic film of CaMoO4 on the surface, which reduces the floatability of the minerals.
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