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Founded in 1987， Bimonthly
Supervisor：Jiangxi University Of Science And Technology
Sponsored by：Jiangxi University Of Science And Technology
Jiangxi Nonferrous Metals Society
ISSN：1674-9669
CN：36-1311/TF
CODEN YJKYA9
Volume 10 Issue 1
Feb.  2019
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HE Yunlong, XU Ruidong, HE Shiwei, ZHU Yun, SHEN Qingfeng, CHEN Hansen, LI Kuo. Research on bismuth extraction from alkaline oxidative leaching residues of bismuth-rich lead anode slime by casting and electrolysis[J]. Nonferrous Metals Science and Engineering, 2019, 10(1): 41-48. DOI: 10.13264/j.cnki.ysjskx.2019.01.007
Citation: HE Yunlong, XU Ruidong, HE Shiwei, ZHU Yun, SHEN Qingfeng, CHEN Hansen, LI Kuo. Research on bismuth extraction from alkaline oxidative leaching residues of bismuth-rich lead anode slime by casting and electrolysis[J]. Nonferrous Metals Science and Engineering, 2019, 10(1): 41-48. DOI: 10.13264/j.cnki.ysjskx.2019.01.007
shu

Research on bismuth extraction from alkaline oxidative leaching residues of bismuth-rich lead anode slime by casting and electrolysis

  • a.

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

  • b.

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

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  • Received Date: November 26, 2018
  • Published Date: February 27, 2019
    Graphical Abstract
    • Abstract
  • Alkaline oxidative leaching residues of bismuth-rich lead anode slime were adopted to extract bismuth and enrich gold and silver by using carbothermal reduction casting and electrolysis process. Thermodynamics analysis indicates that the initial carbothermal reduction temperature of metal oxides from low to high are Cu, Bi, Pb, Sb, Sn. Bismuth oxides can obtain enough reduction thermodynamic driving force when the temperature excesses 800 ℃. The optimum technical conditions are as follows: temperature, 800 ℃; carbon addition, 5 % of the mass of leaching residue; Na2B4O7 addition, 15 % of the mass of the leaching residue; time duration, 1.5 h. Under such conditions the average contents of bismuth, gold and silver were 84.29 %, 39.62 g/t and 6519 g/t, respectively. Compared with the raw lead anode slime, the content of gold and silver were enriched 1.8 times respectively. Kilogram-scale crude bismuth alloys were electrolyzed in HCl-NaCl-BiCl3 system as anodic plates for 24 h, 48 h, 72 h, 112 h. The results indicated that the content of bismuth in the cathodal products exceeded 98 %, the current efficiency, 96 %, and the average content of gold and silver content were 222.94 g/t, 34287.6 g/t, respectively. Compared with the raw lead anode slime, the content of gold and silver were enriched 9.54 times and 10.13 times, respectively.
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    • References (23)
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