A novel method to achieve the flotation of pyrite from lizardite slime without collector or depressant

A novel method to achieve the flotation of pyrite from lizardite slime without collector or depressant
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一种无需捕收剂和抑制剂从蜥蜴矿泥中浮选黄铁矿的新方法

DOI:
10.1016/j.mineng.2020.106580
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发表时间:
2020-10
影响因子:
4.8
通讯作者:
Hong Yu
Hong Yu
中科院分区:
工程技术2区
文献类型:
--
作者:
Siyuan Yang;Yanling Xu;Cheng Liu;Guanghua Ai;Lingyun Huang;Hong Yu

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采用硫化钠(Na 2S)与pH调节相结合的方法实现了利蛇纹石细泥中黄铁矿的高效浮选。微浮选试验结果表明,利蛇纹石矿泥的加入会降低黄铁矿的可浮性,但在高碱度和Na 2S存在的条件下,利蛇纹石矿泥对黄铁矿的浮选没有影响。Zeta电位测定结果表明,当pH > 10时,利蛇纹石和黄铁矿表面均带负电荷,利蛇纹石矿泥由于静电排斥作用从黄铁矿表面脱离。Na 2S可以选择性地以HS-的形式吸附在暴露的黄铁矿表面,并通过电化学作用氧化为疏水性的SO,从而改善黄铁矿的可浮性。
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 S0through the electrochemical interaction, leading to the improvement of pyrite floatability.
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