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中南大学学报(英文版)

Journal of Central South University

Vol. 27    No. 6    June 2020

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Oxygen pressure acid leaching of artificial sphalerite catalyzed by Fe3+/Fe2+ self-precipitation
TIAN Lei(田磊)1, GONG Ao(龚傲)1, WU Xuan-gao(吴选高)1, XU Zhi-feng(徐志峰)1, ZHANG Ting-an(张廷安)3, LIU Yan(刘燕)3, WEI Kui-xian(魏奎先)2, YU Zhan-liang(于占良)2

1. School of Metallurgical and Chemical Engineering, Jiangxi University of Science and Technology,Ganzhou 341000, China;
2. The State Key Laboratory of Pressure Hydrometallurgical Technology of Associated Nonferrous Metal Resources, Kunming 650503, China;
3. Key Laboratory for Ecological Utilization of Multimetallic Mineral, Ministry of Education,
Shenyang 110819, China

Abstract:The mechanism of oxygen pressure acid leaching of sphalerite catalyzed by Fe3+/Fe2+ self-precipitation was investigated in this study. Artificial sphalerite was fabricated with varying amounts of iron content via the sintering of ZnS and FeS and used for the pressure acid leaching experiment. The variations in the potential of the pressure leaching system were investigated by using a self-designed potential autoclave. The results showed that compared to the non-iron sphalerite, there was a violent redox reaction between the 25.70% Fe-artificial sphalerite and dissolved oxygen during the process of pressure leaching; and the catalytic mechanism was attributed to the redox couple Fe3+/Fe2+, where Fe3+oxidizes the H2S gas film and the reduced Fe2+ state is subsequently oxidized by the dissolved oxygen. Furthermore, the effect of temperature, H2SO4 concentration, and oxygen partial pressure on the artificial sphalerite with different iron contents was studied. The sphalerite samples with iron content were observed to dissolve more easily in sulfuric acid compared to the non-iron samples. Moreover, the activation energy of artificial sphalerite was observed to be lower in the sample with 25.70% iron content (22.26 kJ/mol) compared to that with no iron (32.31 kJ/mol); and the apparent reaction orders were obtained with respect to H2SO4 concentration (1.10 and 1.36) and oxygen partial pressure (1.29 and 1.41), respectively. A comprehensive kinetic model was developed on the basis of the experimental data and the fitted leaching ratio plot; and the kinetic equations for the leaching of sphalerite catalyzed by Fe3+/Fe2+ self-precipitation were determined.

 

Key words: leaching mechanism catalyzed by Fe3+/Fe2+ self-precipitation; potential curves; artificial sphalerite; leaching kinetics; activation energy; reaction orders

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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