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- Title
Leaching Behavior of Lead and Silver from Lead Sulfate Hazardous Residues in NaCl-CaCl<sub>2</sub>-NaClO<sub>3</sub> Media.
- Authors
Zhang, Yuhui; Song, Qinghe; Jin, Bingjie; Chen, Buming; Wang, Chengyan
- Abstract
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 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 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.
- Subjects
SILVER; SILVER sulfide; SULFATES; ACTIVATION energy; LEACHING; LEAD
- Publication
JOM: The Journal of The Minerals, Metals & Materials Society (TMS), 2019, Vol 71, Issue 7, p2388
- ISSN
1047-4838
- Publication type
Article
- DOI
10.1007/s11837-019-03472-1