阿仑膦酸钠在萤石和方解石浮选分离中的作用及机理

Effect and Mechanism of Alendronate Sodium in Flotation Separation of Fluorite and Calcite

这是一篇矿物加工工程领域的论文。通过单矿物浮选实验、接触角测试、Zeta电位测试、吸附量测试及红外光谱分析,研究阿仑膦酸钠对萤石与方解石浮选行为的影响,考查阿仑膦酸钠在两种矿物表面的作用机理。单矿物浮选实验结果表明:在仅添加油酸钠时,萤石与方解石在pH值7~12区间内都具有较好的可浮性,难以分离。在添加阿仑膦酸钠后,萤石与方解石的可浮性出现差异,可以实现两者浮选分离。接触角测试、Zeta电位测试、吸附量测试及红外光谱分析结果表明:阿仑膦酸钠在萤石表面的吸附量较少,对其表面润湿性影响较小,在方解石表面的吸附量大,对其表面润湿性影响较大。阿仑膦酸钠中的两个磷酸基团与方解石表面的钙原子结合,阻碍了油酸分子在方解石表面的吸附,使得方解石被抑制。

This is an essay in the field of mineral processing engineering.Through micro-flotation experiment,contact Angle test,Zeta potential test,Adsorption measurements and infrared spectrum analysis,the effects of alendronate sodium on the flotation behavior of fluorite and calcite were studied,and the adsorption mechanism of alendronate sodium on the surface of two kinds of minerals was investigated.Micro-flotation experiment results show that when only sodium oleate is added,fluorite and calcite have good floatability in the pH range of 7~12 and are difficult to separate.The floatability of fluorite and calcite is different when sodium alendronate is added,and the flotation separation of fluorite and calcite can be realized.The results of contact Angle test,Zeta potential test,adsorption capacity test and infrared spectrum analysis showed that the adsorption amount of sodium alendronate on fluorite surface was less,which had little effect on its surface wettability,while the adsorption amount on calcite surface was larger,which had a greater effect on its surface wettability.Two phosphate groups in sodium alendronate bind with calcium atoms on the surface of calcite,which hindered the adsorption of oleic acid molecules on the surface of calcite,thus inhibiting the calcite.