针对油酸钠体系下Mg2+对白云母浮选行为的影响进行了研究,结合浮选溶液化学、Zeta电位、XPS等手段探讨了Mg2+与白云母的作用机理。结果表明,Mg2+在碱性条件下可以明显提高白云母的可浮性,并且pH值越大Mg2+对白云母的活化效果越好。当pH=12,油酸钠用量为9.20×10-4 mol/L时,3.44×10-4 mol/L的Mg2+可使白云母的回收率提高到82.20%。 Mg2+活化白云母的根本原因在于：Mg2+可强化油酸根离子在白云母表面的局部正电区域的静电吸附作用,同时可以提高白云母表面铝和硅离子与油酸根离子的反应的机率。此外,白云母表面覆盖的Mg2+可与油酸根离子反应生成疏水的油酸镁。在这三者共同作用下,白云母的可浮性得到了显著的提高。
Aimed at sodium oleate system, the effect of Mg2+ on the flotation behavior of muscovite was investigated then the activation mechanism of Mg2+ on muscovite was detected by means of flotation solution chemical, Zeta potential and XPS spectra etc. The result shows that muscovite can be activated significantly by Mg2+ under alkaline conditions and the greater pH value, the better activation effect of Mg2+ on the muscovite. The muscovite recovery rate reached 82. 20% when the amount of sodium oleate and Mg2+ was 9. 20 × 10 -4 mol/L and 3. 44 × 10 -4 mol/L respectively at pH=12. The radical activation cause of Mg2+ on muscovite is it can enhance oleate ions' electrostatic adsorption on local positive region of muscovite surface and increase the reaction probability of oleate ions with reactive Al and Si on muscovite surface. Furthermore, the magnesium ion covering on muscovite surface can react with oleic acid ions to generate hydrophobic magnesium oleate. So muscovite floatability can be significantly improved under the combined action of these three factors.
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