Abstract A combination of sodium sulfide (Na2S) and pH adjustment was introduced in this study to achieve the efficient flotation of pyrite from lizardite slime. Microflotation results showed that the addition of lizardite slime could depress the floatability of the pyrite but it did not interfere with the pyrite flotation under high alkalinity condition in the presence of Na2S. Zeta potential measurements revealed that the surface charges of lizardite and pyrite were both negative when pH > 10, causing the detachment of lizardite slime from pyrite surface due to the electrostatic repulsion. Then Na2S could selectively adsorb onto the exposed pyrite surface in the form of HS− and oxidized to the hydrophobic S0 through the electrochemical interaction, leading to the improvement of pyrite floatability.

中文翻译：

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一种无捕收剂和抑制剂从蜥蜴矿泥中浮选黄铁矿的新方法

摘要 本研究引入硫化钠(Na2S)和pH调节相结合的方法，实现了蜥蜴矿泥中黄铁矿的高效浮选。微浮选结果表明,在Na2S存在的高碱度条件下,蜥蜴矿泥的加入会降低黄铁矿的可浮性,但不影响黄铁矿的浮选。Zeta 电位测量表明，当 pH > 10 时，蜥蜴矿和黄铁矿的表面电荷均为负电荷，导致蜥蜴矿泥由于静电排斥而从黄铁矿表面脱离。然后 Na2S 可以以 HS− 的形式选择性吸附到暴露的黄铁矿表面，并通过电化学相互作用氧化成疏水的 S0，从而提高黄铁矿的可浮性。