Oxidative ammonia leaching kinetics of zinc extracted from mixed sulfide-oxide lead and zinc ore

JIA Nan-nan; WANG Hui-gang; GUO Min; ZHANG Mei

doi:10.13374/j.issn2095-9389.2017.03.009

Volume 39 Issue 3

Mar. 2017

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JIA Nan-nan, WANG Hui-gang, GUO Min, ZHANG Mei. Oxidative ammonia leaching kinetics of zinc extracted from mixed sulfide-oxide lead and zinc ore[J]. Chinese Journal of Engineering, 2017, 39(3): 377-382. doi: 10.13374/j.issn2095-9389.2017.03.009

Citation:

JIA Nan-nan, WANG Hui-gang, GUO Min, ZHANG Mei. Oxidative ammonia leaching kinetics of zinc extracted from mixed sulfide-oxide lead and zinc ore[J]. Chinese Journal of Engineering, 2017, 39(3): 377-382. doi: 10.13374/j.issn2095-9389.2017.03.009

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Oxidative ammonia leaching kinetics of zinc extracted from mixed sulfide-oxide lead and zinc ore

doi: 10.13374/j.issn2095-9389.2017.03.009

School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China

Received Date: 2016-05-31

Abstract

Abstract

The leaching experiments of zinc from mixed sulfide-oxide lead and zinc ore were performed in NH₃-(NH₄)₂SO₄ solution with ammonium persulfate as an oxidant under atmospheric pressure and relatively low temperature. The effects of stirring speed, lixiviants, oxidant concentration and reaction temperature on the leaching rate of zinc were studied. The results show that under the optimal conditions, the leaching rate of zinc can reach 93. 2%, and nearly no other metal ions enter into lixivium during the leaching process, which shows that this ammoniacal leaching system has a high efficiency and selectivity. This is significant to simplify the following purification process and product preparation process. Leaching kinetics indicates that the oxidative leaching of zinc could be represented by a shrinking core model with product layer diffusion and the activation energy for the dissolution reaction is calculated as 17. 89 kJ·mol^-1.
- lead zinc ore treatment,
- ammonium persulfate,
- leaching kinetics,
- selectivity

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References(13)

References

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