The role of sodium sulfide in the flotation of pyrite depressed in chalcopyrite flotation
The role of sodium sulfide in the flotation of pyrite depressed in chalcopyrite flotation
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DOI：
10.1016/j.mineng.2018.01.029
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发表时间：
2018-04-01
影响因子：
4.8
通讯作者：
Peng, Yongjun
中科院分区：
文献类型：
--
作者：
Cao, Zhao;Chen, Xumeng;Peng, Yongjun
在铜-金浮选厂中，在铜浮选中被抑制的黄铁矿通常随后加入硫化钠（Na 2S）浮选以回收伴生金。通过浮选试验和Cyro-XPS（X射线光电子能谱）分析，首次研究了黄铜矿浮选过程中Na 2S对黄铁矿浮选的抑制作用。结果表明，Na 2S的加入对黄铁矿浮选的改善程度与PAX的加入相同，Na 2S与PAX的组合进一步提高了黄铁矿的回收率。有趣的是，PAX和Na 2S通过不同的机理促进黄铁矿浮选。PAX还原了亲水性金属氧化物并吸附在黄铁矿表面，导致被抑制的黄铁矿被浮选。与PAX不同，Na 2S通过在黄铁矿表面形成元素硫和多硫化物来增加黄铁矿的疏水性和黄铁矿的浮选性。PAX和Na 2S同时使用，由于PAX和Na 2S的共同作用，进一步增强了黄铁矿的疏水性和黄铁矿的浮选。
In copper-gold flotation plants, pyrite which is depressed in copper flotation is often floated subsequently with the addition of sodium sulfide (Na2S) to recover the associated gold. For the first time, this study investigated the role of Na2S responsible for the flotation of pyrite depressed in chalcopyrite flotation through flotation tests and Cyro-XPS (X-ray photoelectron spectroscopy) analyses. It was found that the application of Na2S improved pyrite flotation to the same extent as the application of PAX and the combination of Na2S and PAX further increased pyrite recovery. It is interesting that PAX and Na2S promoted pyrite flotation through different mechanisms. PAX reduced the hydrophilic metal oxidation species and adsorbed on pyrite surface, resulting in the flotation of depressed pyrite. Unlike PAX, Na2S increased the hydrophobicity of pyrite and pyrite flotation by forming elemental sulfur and polysulfide on pyrite surface. The application of PAX and Na2S at the same time further enhanced the hydrophobicity of pyrite and pyrite flotation as a result of the combined actions of PAX and Na2S.