Kinetics of Pb and Zn leaching from zinc plant residue by sodium hydroxide
In the hydrometallurgical zinc production processes, important amount of hazardous solid extraction residue containing unextractable Zn and Pb is generated. Due to increasing demand of metals and the depletion of high grade natural resources, these types of wastes are gaining great importan...
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| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
University of Belgrade, Technical Faculty, Bor
2015-01-01
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| Series: | Journal of Mining and Metallurgy. Section B: Metallurgy |
| Subjects: | |
| Online Access: | http://www.doiserbia.nb.rs/img/doi/1450-5339/2015/1450-53391500012E.pdf |
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| Summary: | In the hydrometallurgical zinc production processes, important amount of
hazardous solid extraction residue containing unextractable Zn and Pb is
generated. Due to increasing demand of metals and the depletion of high grade
natural resources, these types of wastes are gaining great importance in the
metallurgical industries. In this study, selective leaching and leaching
kinetics of Pb and Zn from zinc extraction residue were investigated. For
this purpose; the effects of NaOH concentration, contact time, stirring speed
and temperature on the Pb and Zn recovery from the residue were studied. The
shrinking core model was applied to the results of the experiments. Leaching
results showed that 85.55% Pb and 21.3 % Zn could be leached under the
optimized conditions. The leaching of Pb and Zn were found to fit well to
shrinking core model with ash layer diffusion control. Activation energy
values for Pb and Zn leaching were calculated to be 13.645 and 22.59 kJ/mol,
respectively. |
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| ISSN: | 1450-5339 2217-7175 |