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Leaching Behavior of Lead and Silver from Lead Sulfate Hazardous Residues in NaCl-CaCl2-NaClO3 Media

  • Yuhui Zhang
  • Bingjie JinEmail author
  • Qinghe Song
  • Buming Chen
  • Chengyan WangEmail author
Technical Article


The leaching behavior of lead and silver from lead sulfate residues in NaCl-CaCl2-NaClO3 media was studied systematically. The results indicate that Cl concentration, NaClO3 concentration, leaching time and temperature had significant effects on lead and silver leaching, whilst agitation speed and the liquid–solid ratio had a secondary effect on silver leaching but little effect on lead leaching. The Ca2+ concentration had an important effect on \( {\text{SO}}_{4}^{2 - } \) removal but little effect on lead and silver leaching. The optimum parameters for lead and silver leaching were: initial Cl concentration: 207.5 g/L; NaClO3 concentration: 12 g/L; Ca2+ concentration: 1.3 times of stoichiometric quantity; temperature: 90 ± 2 °C; time: 1 h; liquid–solid ratio: 8:1–10:1; and agitation speed: 450 rpm. The lead and silver leaching were > 98% and 95%, respectively. The removal ratio of \( {\text{SO}}_{4}^{2 - } \) was > 98%. The leaching kinetics of lead follow the shrinking core model of mixed control, and the apparent activation energy was 13.4 kJ/mol.



This work was supported financially by the National Natural Science Foundation of China (No. 51764026; No. 51364019; No. 51564029). The authors gratefully acknowledge Prof. David B. Dreisinger of The University of British Columbia and Prof. Chunmei Tan of the Yunnan Copper group for English editing.

Supplementary material

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Supplementary material 1 (PDF 765 kb)


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Copyright information

© The Minerals, Metals & Materials Society 2019

Authors and Affiliations

  1. 1.Faculty of Metallurgical and Energy EngineeringKunming University of Science and TechnologyKunmingPeople’s Republic of China
  2. 2.State Key Laboratory of Complex Nonferrous Metal Resources Clean UtilizationKunming University of Science and TechnologyKunmingPeople’s Republic of China
  3. 3.School of Metallurgical and Ecological EngineeringUniversity of Science and Technology BeijingBeijingPeople’s Republic of China

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