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Volume 26 Issue 6
Jun.  2019
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文章导航 >  矿物冶金与材料学报（英文）  > 2019  >  26(6): 689-700
Yun-long He, Rui-dong Xu, Shi-wei He, Han-sen Chen, Kuo Li, Yun Zhu,  and Qing-feng Shen, Alkaline pressure oxidative leaching of bismuth-rich and arsenic-rich lead anode slime, Int. J. Miner. Metall. Mater., 26(2019), No. 6, pp. 689-700. https://doi.org/10.1007/s12613-019-1776-y
Cite this article as:
Yun-long He, Rui-dong Xu, Shi-wei He, Han-sen Chen, Kuo Li, Yun Zhu,  and Qing-feng Shen, Alkaline pressure oxidative leaching of bismuth-rich and arsenic-rich lead anode slime, Int. J. Miner. Metall. Mater., 26(2019), No. 6, pp. 689-700. https://doi.org/10.1007/s12613-019-1776-y
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研究论文

Alkaline pressure oxidative leaching of bismuth-rich and arsenic-rich lead anode slime

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

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

  • 通讯作者:

    Rui-dong Xu    E-mail: rdxupaper@aliyun.com

  • A new alkaline pressure oxidative leaching process (with NaNO3 as the oxidant and NaOH as the alkaline reagent) is proposed herein to remove arsenic, antimony, and lead from bismuth-rich and arsenic-rich lead anode slime for bismuth, gold, and silver enrichment. The effects of the temperature, liquid-to-solid ratio, leaching time, and reagent concentration on the leaching ratios of arsenic, antimony, and lead were investigated to identify the optimum leaching conditions. The experimental results under optimized conditions indicate that the average leaching ratios of arsenic, antimony and lead are 95.36%, 79.98%, 63.08%, respectively. X-ray diffraction analysis indicated that the leaching residue is composed of Bi, Bi2O3, Pb2Sb2O7, and trace amounts of NaSb(OH)6. Arsenic, antimony, and lead are thus separated from lead anode slime as Na3AsO4·10H2O and Pb2Sb2O7. Scanning electron microscopy and energy-dispersive spectrometry imaging revealed that the samples undergo appreciable changes in their surface morphology during leaching and that the majority of arsenic, lead, and antimony is removed. X-ray photoelectron spectroscopy was used to demonstrate the variation in the valence states of the arsenic, lead, and antimony. The Pb(IV) and Sb(V) content was found to increase substantially with the addition of NaNO3.
    • Research Article

    Alkaline pressure oxidative leaching of bismuth-rich and arsenic-rich lead anode slime

    + Author Affiliations
      Abstract
    • A new alkaline pressure oxidative leaching process (with NaNO3 as the oxidant and NaOH as the alkaline reagent) is proposed herein to remove arsenic, antimony, and lead from bismuth-rich and arsenic-rich lead anode slime for bismuth, gold, and silver enrichment. The effects of the temperature, liquid-to-solid ratio, leaching time, and reagent concentration on the leaching ratios of arsenic, antimony, and lead were investigated to identify the optimum leaching conditions. The experimental results under optimized conditions indicate that the average leaching ratios of arsenic, antimony and lead are 95.36%, 79.98%, 63.08%, respectively. X-ray diffraction analysis indicated that the leaching residue is composed of Bi, Bi2O3, Pb2Sb2O7, and trace amounts of NaSb(OH)6. Arsenic, antimony, and lead are thus separated from lead anode slime as Na3AsO4·10H2O and Pb2Sb2O7. Scanning electron microscopy and energy-dispersive spectrometry imaging revealed that the samples undergo appreciable changes in their surface morphology during leaching and that the majority of arsenic, lead, and antimony is removed. X-ray photoelectron spectroscopy was used to demonstrate the variation in the valence states of the arsenic, lead, and antimony. The Pb(IV) and Sb(V) content was found to increase substantially with the addition of NaNO3.
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