Understanding the roles of Na2S and Pb(II)in the flotation of hemimorphite
Understanding the roles of Na2S and Pb(II)in the flotation of hemimorphite
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DOI：
10.1016/j.mineng.2017.06.010
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发表时间：
2017-09
影响因子：
4.8
通讯作者：
Kai Jia;Q. Feng;Guofan Zhang;Qing Shi;Ziyong Chang
中科院分区：
文献类型：
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作者：
Kai Jia;Q. Feng;Guofan Zhang;Qing Shi;Ziyong Chang
研究了“Na2S-Pb(II)-黄药”工艺浮选半铁榴石的机理，包括硫化钠预硫化、铅离子活化和丁基黄药捕收剂浮选。采用x射线光电子能谱（XPS）、扫描电镜（SEM）、能谱仪（EDS）和x射线衍射（XRD）等表征方法，对Na2S和Pb（II）与半亚晶颗粒的相互作用机理进行了研究。结果表明，“Na2S-Pb(II)-黄药”工艺是一种有效的半铁精矿浮选方法，半铁精矿的最大回收率由40%提高到90%。氢硫化物离子被化学吸附或参与到半亚铁矿表面，形成一层ZnS。XRD结果表明，ZnS层呈非晶态或结晶不良。Pb（II）与ZnS通过离子交换机制相互作用生成PbS，并通过XPS、SEM-EDS和XRD进行了验证。XRD研究表明，在半亚铁矿石表面形成的新PbS相是结晶良好的“合成方铅矿”，具有良好的可浮性，这对“Na2S-Pb(II)-黄药”工艺浮选半亚铁矿石具有潜在的应用前景至关重要。
The mechanisms involved in hemimorphite flotation using the “Na2S-Pb(II)-xanthate” process, including pre-sulfurization using sodium sulfide, activation by lead cations and subsequent flotation using a butyl xanthate collector, were studied. X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) coupled with energy dispersive spectrometry (EDS), and X-ray diffraction (XRD) characterization were conducted to identify the mechanism of interaction of Na2S and Pb(II) with hemimorphite particles. The results indicated that the “Na2S-Pb(II)-xanthate” process is an effective method for the flotation of hemimorphite, and the maximum recovery of the hemimorphite concentrate increased from 40% to 90%. Hydrosulfide ions were chemisorbed or participated on the hemimorphite ore surface, and a layer of ZnS was formed. The XRD results indicated that the ZnS layer was amorphous or poorly crystallized. PbS was generated by the interaction of Pb(II) with ZnS through an ion-exchange mechanism, which was verified by XPS, SEM-EDS and XRD. The XRD study indicated that the new PbS phase formed on the hemimorphite ore surface was well-crystallized “synthetic galena” with good floatability, which is critical for the potential application of hemimorphite flotation using the “Na2S-Pb(II)-xanthate” process.