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

  • Yun-long He
  • Rui-dong XuEmail author
  • Shi-wei He
  • Han-sen Chen
  • Kuo Li
  • Yun Zhu
  • Qing-feng Shen
Article
  • 13 Downloads

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.

Keywords

lead anode slime pressure leaching arsenic removal antimony bismuth 

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (No. 51564031), Independent Research Project of the State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization (No. CNMRCUTS1707), and the Cooperation project between School and Enterprise of China (No. 0201352042).

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Copyright information

© University of Science and Technology Beijing and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  • Yun-long He
    • 1
  • Rui-dong Xu
    • 1
    • 2
    Email author
  • Shi-wei He
    • 1
  • Han-sen Chen
    • 1
  • Kuo Li
    • 1
  • Yun Zhu
    • 1
  • Qing-feng Shen
    • 1
  1. 1.Faculty of Metallurgical and Energy EngineeringKunming University of Science and TechnologyKunmingChina
  2. 2.State Key Laboratory of Complex Nonferrous Metal Resources Clean UtilizationKunming University of Science and TechnologyKunmingChina

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