Li Yubiao, Lartey Clement, Song Shaoxian, Li Yingjie, Gerson Andrea R
School of Resources and Environmental Engineering, Wuhan University of Technology Wuhan 430070 Hubei China
School of Natural and Built Environments, University of South Australia Mawson Lakes SA 5095 Australia.
RSC Adv. 2018 Jun 27;8(41):23364-23371. doi: 10.1039/c8ra02690d. eCollection 2018 Jun 21.
Due to regional shortage of freshwater, the use of saline/seawater for Cu-Mo sulfide ore flotation has received considerable attention. However, the effects of various salts, especially the cations present in seawater, on molybdenite flotation and the mechanisms involved remain unclear due to the complexity of the solutions applied. In this work, the influence of some common cations (, Na, K, Ca and Mg) with sulfate (SO ) anions on molybdenite flotability was investigated in the absence of flotation reagents (, frothers and collectors) at pH 10. Flotation results indicated a greater depression of molybdenite recovery with increased sulfate salt concentration. The underlying mechanisms responsible for the deleterious effects in the presence of Na and K can be attributed to the increased repulsive forces between molybdenite particles and bubbles owing to increased molybdenite oxidation to produce , MoO and HMoO . However, the increased depression observed in the presence of Mg and Ca is likely due to the adsorption of precipitated Mg(OH) and CaMoO, respectively, onto molybdenite surfaces. These clearly show the different depressing mechanisms due to monovalent and divalent sulfates on molybdenite flotation in the absence of flotation reagents, to reveal the influence of these sulfate salts on its natural flotability.
由于区域淡水短缺，在铜钼硫化矿浮选中使用盐水/海水受到了广泛关注。然而，由于所应用溶液的复杂性，各种盐类，特别是海水中存在的阳离子，对辉钼矿浮选的影响及其作用机制仍不清楚。在本工作中，研究了在pH值为10且不存在浮选试剂（起泡剂和捕收剂）的情况下，一些常见阳离子（Na、K、Ca和Mg）与硫酸根（SO₄²⁻）阴离子对辉钼矿可浮性的影响。浮选结果表明，随着硫酸盐浓度的增加，辉钼矿回收率的抑制作用增强。在存在Na和K时产生有害影响的潜在机制可归因于辉钼矿颗粒与气泡之间的排斥力增加，这是由于辉钼矿氧化增加生成MoO₄²⁻、MoO₄²⁻和HMoO₄⁻所致。然而，在存在Mg和Ca时观察到的抑制作用增强可能分别是由于沉淀的Mg(OH)₂和CaMoO₄吸附在辉钼矿表面。这些结果清楚地表明了在不存在浮选试剂的情况下，一价和二价硫酸盐对辉钼矿浮选的不同抑制机制，揭示了这些硫酸盐对其天然可浮性的影响。
