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
XIANG Ping, FENG Qi-ming, NIU Yin-jian, XIAO Gong-ming, LIU Wei-qi. Sulphuric Acid Leaching of (from Zinc Electrolysis Anode Slime Using PbS as a Reductant[J]. Nonferrous Metals Science and Engineering, 2010, 24(3-4): 92-96.
Citation: XIANG Ping, FENG Qi-ming, NIU Yin-jian, XIAO Gong-ming, LIU Wei-qi. Sulphuric Acid Leaching of (from Zinc Electrolysis Anode Slime Using PbS as a Reductant[J]. Nonferrous Metals Science and Engineering, 2010, 24(3-4): 92-96.

Sulphuric Acid Leaching of (from Zinc Electrolysis Anode Slime Using PbS as a Reductant

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  • Received Date: July 22, 2010
  • Published Date: October 30, 2010
  • An investigation into leaching of MnO2 from zinc electrolysis anode slime in Zhuzhou Zinc smelter in sulphuric acid solution using PbS as a reductant was carried out. The effects of the fineness of PbS particle, the molar ratio of PbS to MnO2, the molar ratio of H2SO4 to MnO2, the reaction time and temperature etc. on the leaching rate of Mn were discussed in the batch test that used pure PbS as the reductante. The results revealed that the finer the PbS particles were, the more contact area of PbS particles to MnO2 was, and so the faster the leaching speed of Mn was obtained. The results also showed that the molar ratio of PbS to MnO2, the molar ratio of H2SO4 to MnO2, the reaction time and temperature etc. had significant influence on the leaching speed of Mn. The optimal leaching conditions were obtained using 0.5 molar ratio of PbS to MnO2 and 3 molar ratio of H2SO4 to MnO2 for 120min at 90℃. At the optimal leaching conditions using 0.037 ~0.074mm pure PbS as the reductant, more than 85% of Mn leaching rate could be obtained. At the same conditions using PbS flotation concentrates as the reductant, more than 93% of Mn leaching rate could be obtained. The leaching test using PbS flotation concentrate as the reductant showed that the synergistic reductive extraction of ZnS and FeS caused the content of impurities in filtrate be upgraded, as well as the content of Pb in leaching slag be reduced. So that, in order to produce high-purity manganese products using Mn2+-containing leaching solution, as well as to facilitate leaching slag into the furnace smelting, it is better to adopt a higher grade flotation concentrate of PbS as the reductant.
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