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Leaching kinetics of low-grade copper ore with high-alkality gangues in ammonia-ammonium sulphate solution

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Abstract

The leaching kinetics of low-grade copper ore with high-alkality gangues was studied in ammonia-ammonium sulphate solution. The main parameters, such as ammonia and ammonium sulphate concentrations, particle size, solid-to-liquid ratio and reaction temperature, were chosen in the experiments. The results show that the increase of temperature, concentrations of ammonia and ammonium sulphate is propitious to the leaching rate of copper ore. The leaching rate increases with the decrease of particle size and solid-to-liquid ratio. The leaching rate is controlled by the diffusion through the ash layer and the activation energy is determined to be 25.54 kJ/mol. A semi-empirical equation was proposed to describe the leaching kinetics.

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Authors and Affiliations

  1. School of Chemistry and Chemical Engineering, Central South University, Changsha, 410083, China

    Zhi-xiong Liu  (刘志雄), Zhou-lan Yin  (尹周澜), Hui-ping Hu  (胡慧萍) & Qi-yuan Chen  (陈启元)

  2. College of Chemistry and Chemical Engineering, Jishou University, Jishou, 416000, China

    Zhi-xiong Liu  (刘志雄)

Authors
  1. Zhi-xiong Liu  (刘志雄)
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  2. Zhou-lan Yin  (尹周澜)
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  3. Hui-ping Hu  (胡慧萍)
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  4. Qi-yuan Chen  (陈启元)
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Corresponding author

Correspondence to Zhou-lan Yin  (尹周澜).

Additional information

Foundation item: Project(2007CB613601) supported by the National Basic Research Program of China; Project(10C1095) supported by the Foundation of Hunan Educational Committee, China

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Liu, Zx., Yin, Zl., Hu, Hp. et al. Leaching kinetics of low-grade copper ore with high-alkality gangues in ammonia-ammonium sulphate solution. J. Cent. South Univ. Technol. 19, 77–84 (2012). https://doi.org/10.1007/s11771-012-0975-8

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  • DOI: https://doi.org/10.1007/s11771-012-0975-8

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