粉石英与红柱石的浮选分离机理研究

The mechanism of flotation separation of powder quartz from andalusite

本文以油酸钠作为捕收剂,研究了磷酸氢二钠、柠檬酸和硅酸钠等抑制剂对粉石英与红柱石浮选分离效果的影响。结果表明,磷酸氢二钠是红柱石与粉石英浮选分离的一种优良的抑制剂;在其最佳浓度0.47×10-2mol/L,浮选液pH值为8.5时,粉石英与红柱石浮选回收率差高达47.86%。红外光谱及Zeta电位分析结果表明,油酸钠对红柱石兼有物理和化学吸附作用,对粉石英仅有物理吸附作用,因而对红柱石有更强的捕收能力;磷酸氢二钠对粉石英表面起解吸作用,能有效抑制粉石英起浮,从而实现粉石英与红柱石的分离。

In this paper, the effect of various inhibitors, such as disodium hydrogen phosphate, citric acid and sodium silicate, on flotation separation performance of powder quartz and andalusite was investigated by using sodium oleate as the flotation collector. The results showed that disodium hydrogen phosphate was an efficient inhibitor for separating andalusite from powder quartz. When the concentration of disodium hydrogen phosphate was set to the optimum one of 0.47 × 10.2 mol/L and the pH of flotation liquid to 8.5, the recovery difference between andalusite and powder quartz was as high as 47.86 %. The results of infrared spectra and Zeta potential analyses revealed that the interaction between sodium oleate and andalusite powder resulted from the physical and chemical adsorption, while that between sodium oleate and powder quartz was due to the physical adsorption, suggesting that sodium oleate was more efficient in collecting andalusite. Also disodium hydrogen phosphate was found to play the role of desorption of powder quartz from sodium oleate, consequently inhibiting the flotation of powder quartz and resulting in the flotation separation of powder quartz from andalusite.