油酸钠体系中硫化钠与白云母的作用机理

Study on the Mechanism of Sodium Sulfide Affecting the Effect of Sodium Oleate on Muscovite

为掌握从选钼尾矿回收非金属矿时尾矿残留的硫化钠对白云母回收效果的影响规律,研究采用XPS等手段对经硫化钠及油酸钠作用前后白云母样品进行了表征。结果表明,在pH值为6.5的条件下,矿浆中HS^(-)与白云母表面的局部正电区发生静电吸附并导致其表面电位负向增大。同时,矿浆中的HS^(-)可吸附在白云母的(001)、(100)和(010)等晶面并屏蔽上述晶面暴露的不饱和Al-O键,使得油酸根在白云母表面的化学吸附反应受阻,导致白云母表面的Al-OOCR化学键的相对含量减少了15.01%,进而降低了白云母在油酸钠体系中的浮选效果。研究对实现尾矿中白云母的二次资源化具有一定的借鉴意义。

In order to understand the influence of sodium sulfide residue in the molybdenum tailings on the recovery of muscovite,the muscovite samples before and after sodium sulfide and sodium oleate were characterized by XPS.The results showed that under the condition of pH 6.5,the electrostatic adsorption of HS^(-)in pulp occurred in the local positive region of muscovite surface,resulting in the negative increase of surface potential.At the same time,the HS^(-)in the pulp can be adsorbed on the(001),(100)and(010)crystal planes of muscovite and shield the unsaturated Al-O bonds exposed by the above crystal planes,which hinders the chemical adsorption process of oleic acid on the surface of muscovite,resulting in the relative content of Al-OOCR chemical bonds on the surface of muscovite reduced by 15.01%,thereby reducing the flotation effect of muscovite in sodium oleate system.The research has certain reference significance for realizing the secondary resource utilization of muscovite in tailings.