NaF对蛇纹石表面电性的影响

Effect of NaF on surface potential of serpentine

针对蛇纹石自身具有较高的零电点,在硫化铜镍矿中易引起异相凝聚的问题,基于蛇纹石表面的荷电机理,提出一种改变蛇纹石表面电性的调整剂的选择思路,即借助溶液化学数据,选择可以与Mg(OH)_2反应生成镁的难溶产物的物质作为调整剂,在蛇纹石表面生成溶度积较低的新物质,通过减少蛇纹石表面暴露的Mg^(2+)质量分数,达到改变蛇纹石表面电位的目的。通过Zeta电位测试、沉降试验、吸附量测试、X线光电子能谱分析以及溶解试验,研究Na F对蛇纹石表面电性的影响及其影响机理。根据XPS分析结果对蛇纹石表面的镁元素窄扫描图谱进行分峰拟合。研究结果表明:质量分数为61.93%的F-可以稳定地吸附在蛇纹石表面,使溶液中蛇纹石表面镁元素的结合能降低0.1 e V,蛇纹石的等电点pH降低至3.5;NaF作用后的蛇纹石表面出现新的MgF_2峰;蛇纹石与磁黄铁矿人工混合矿异相分散。

Considering that serpentine has high zero-point, and it is easy to cause heterogeneous condense among copper sulfide in nickel sulfide, a new idea was presented, which selected the adjusting agent to change the electrical property of serpentine based on the charge mechanism of the surface of serpentine. A class of agents that could react with Mg（OH）2 on the surface of serpentine was chosen, and the product with low solubility in the light of solution chemistry results was produced, which could reduce the surface potential of the serpentine by reducing the Mg^2＋ exposed on the surface of serpentine. The effects of Na F on the surface potential of serpentine and mechanism were investigated by zeta-potential measurements, sedimentation tests, adsorption tests, X-ray photoelectron spectroscopy and dissolution tests. According to the results of XPS, the narrow scanning of magnesium on the surface of serpentine was fitted. The results show that Fions with mass fraction of 61.93% can be adsorbed on the surface of the serpentine stably, which makes the binding energy of the dissolved serpentine decrease by 0.1 e V, and the isoelectric point pH of serpentine reduces to 3.5. There is a new peak of MgF2 on the effect of Na F. Serpentine and pyrrhotite phase disperse.