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通过浮选试验、沉降试验、表面溶解、ζ电位测试、吸附量测试和红外光谱测试研究六偏磷酸钠在蛇纹石与黄铁矿分离中的作用与机理。结果表明,六偏磷酸钠可以显著减弱蛇纹石对黄铁矿浮选的不利影响,它能在碱性条件下使蛇纹石与黄铁矿分散,从而提高黄药在黄铁矿表面的吸附量。六偏磷酸钠的作用是通过溶出蛇纹石表面的镁,并在其表面吸附,降低蛇纹石表面等电点pH,增强负电性。DLVO理论计算表明,六偏磷酸钠能使蛇纹石与黄铁矿间的总相互作用能由引力位能转变为斥力位能。
The effect and mechanism of sodium hexametaphosphate on the separation of serpentine and pyrite were studied by flotation test, sedimentation test, surface dissolution test, zeta potential test, adsorption capacity test and infrared spectroscopy. The results show that sodium hexametaphosphate can significantly reduce the adverse effect of serpentine on the flotation of pyrite. It can disperse serpentine and pyrite under alkaline conditions, thereby enhancing the adsorption of xanthate on the surface of pyrite Adsorption capacity. The function of sodium hexametaphosphate is to dissolve magnesium on the surface of serpentine and adsorb it on its surface to lower the isoelectric point pH of the serpentine surface and enhance the negative charge. DLVO theoretical calculations show that sodium hexametaphosphate can make the total interaction between serpentine and pyrite to change from gravitational potential energy to repulsive potential energy.