Talc has long been a problematic gangue mineral in sulfide ore flotation due to its natural hydrophobicity. The as-investigated anionic depressants which reacted with the Mg sites on the edge plane of talc always exhibited limited effects because the negatively charged talc particle at pH > 5.0 showed electrostatic resistance for the anion adsorption. Thus, an electrically neutral reagent, fenugreek gum, was introduced as a highly efficient talc depressant in comparison with the sodium carboxymethylcellulose and sodium alginate, coupled with the surface detections on the selective depressant mechanism between chalcopyrite and talc. The micro-flotation results showed that fenugreek gum could selectively depress the talc flotation at lower dosage and wider pH range than sodium carboxymethylcellulose and sodium alginate, suggesting a more efficient depressant role. Surface detection implied that fenugreek gum selectively interacted with the basal plane of the talc surface and remarkably decreased its hydrophobicity mainly through physical adsorption originated from the hydrogen-bonding between the OH group and the [SiO] tetrahedron. Fenugreek gum adsorbed onto talc with much larger capacity than on chalcopyrite, and had little influence on the adsorption density of collector adsorption on chalcopyrite, indicating the highly efficient selectivity of fenugreek gum toward talc depression.

中文翻译：

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黄铜矿浮选胡芦巴胶对滑石粉的高效抑制剂作用探讨


由于其天然疏水性，滑石长期以来一直是硫化矿浮选中存在问题的脉石矿物。所研究的与滑石边缘平面上的 Mg 位点反应的阴离子抑制剂始终表现出有限的效果，因为带负电的滑石颗粒在 pH > 5.0 时对阴离子吸附表现出静电阻力。因此，与羧甲基纤维素钠和海藻酸钠相比，引入电中性试剂胡芦巴胶作为高效滑石抑制剂，并结合表面检测黄铜矿和滑石粉之间的选择性抑制剂机制。微浮选结果表明，与羧甲基纤维素钠和海藻酸钠相比，胡芦巴胶可以在更低的剂量和更宽的pH范围内选择性地抑制滑石粉的浮选，这表明葫芦巴胶具有更有效的抑制作用。表面检测表明胡芦巴胶选择性地与滑石表面的基面相互作用，并主要通过源自OH基团和[SiO]四面体之间的氢键的物理吸附显着降低其疏水性。葫芦巴胶对滑石粉的吸附容量远大于对黄铜矿的吸附容量，且对黄铜矿捕收剂吸附的吸附密度影响不大，表明葫芦巴胶对滑石粉抑制具有高效的选择性。