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Sulfidation mechanism of cerussite in the presence of sulphur at high temperatures

白铅矿与硫磺在高温下的硫化机理

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Abstract

In this paper, sulfidation mechanism of cerussite in the presence of sulphur at high temperatures was investigated based on micro-flotation, X-ray powder diffractometry (XRD), electron probe microanalysis (EPMA) and X-ray photoelectron spectroscopy (XPS). The micro-flotation test results showed that flotation recovery of the treated cerussite increased to above 80% under a suitable flotation condition. It was found that the S/PbCO3 mole ratio and pH obviously affected flotation recovery. XRD analysis results confirmed that the cerussite was decomposed into massicot and then was transformed into mainly PbS and PbO·PbSO4 after sulfidation roasting. EPMA analysis results demonstrated that surface of the obtained massicot was smooth, but surface of the artificial galena was rough and even porous. Content of oxygen decreased, whereas content of sulphur increased with an increase in the S/PbCO3 mole ratio. XPS analysis results revealed that various lead-bearing species, including mainly PbS, PbSO4 and PbO·PbSO4, were generated at the surface. Formation of PbS was advantageous to flotation of the treated cerussite. Based on these results, a reaction model of the cerussite sulfurized with sulphur was proposed.

摘要

本文采用微浮选、X 射线粉末衍射(XRD)、电子探针(EPMA)和X 射线光电子能谱(XPS)等分析 手段, 研究了高温下硫磺与白铅矿的硫化机理。浮选试验结果表明, 在适宜的浮选条件下, 处理后的 白铅矿浮选回收率提高到80%以上。S/PbCO3 摩尔比和pH 值对浮选回收率有明显影响。XRD 分析结 果证实, 硫化焙烧后的白铅矿分解为氧化铅, 然后转化为以PbS 为主和PbO∙PbSO4 的含铅物种。EPMA 分析结果表明, 获得的铅黄表面光滑, 但合成的人工方铅矿表面粗糙, 甚至孔隙较多。随着S/PbCO3 摩尔比的增加, 氧含量降低, 硫含量增加。XPS 分析结果表明, 表面生成了以PbS 为主以及PbSO4 和PbO∙PbSO4 的多种含铅物种。PbS 的形成有利于处理后白铅矿的浮选。基于这些研究结果, 提出了 白铅矿与硫磺在高温条件下的反应模型。

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Authors and Affiliations

  1. State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming, 650093, China

    Bao-liang Ge  (戈保梁), Yong-xing Zheng  (郑永兴), Ji-lai Ning  (宁继来) & Jin-fang Lü  (吕晋芳)

  2. Faculty of Land Resource Engineering, Kunming University of Science and Technology, Kunming, 650093, China

    Bao-liang Ge  (戈保梁), Jie Pang  (庞杰) & Jin-fang Lü  (吕晋芳)

  3. Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming, 650093, China

    Yong-xing Zheng  (郑永兴)

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  1. Bao-liang Ge  (戈保梁)
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  2. Jie Pang  (庞杰)
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  3. Yong-xing Zheng  (郑永兴)
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  4. Ji-lai Ning  (宁继来)
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Contributions

GE Bao-liang designed the experiments; PANG Jie finished most of the experiments; ZHENG Yong-xing wrote the manuscript text; NING Ji-lai assisted the flotation tests of this paper; LÜ Jin-fang devised scheme diagram in Figure 6 and polished this paper.

Corresponding authors

Correspondence to Yong-xing Zheng  (郑永兴) or Jin-fang Lü  (吕晋芳).

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The authors declare no competing financial interests.

Foundation item

Project(51964027) supported by the National Natural Science Foundation of China; Project(2017FB084) supported by the Yunnan Province Applied Basic Research Project, China; Project(2019J0037) supported by the Education Department of Yunnan Province, China

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Ge, Bl., Pang, J., Zheng, Yx. et al. Sulfidation mechanism of cerussite in the presence of sulphur at high temperatures. J. Cent. South Univ. 27, 3259–3268 (2020). https://doi.org/10.1007/s11771-020-4544-2

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