Leaching kinetics of low-grade copper ore with high-alkality gangues in ammonia-ammonium sulphate solution |
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Authors: | Zhi-xiong Liu Zhou-lan Yin Hui-ping Hu and Qi-yuan Chen |
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Affiliation: | [1]School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China [2]College of Chemistry and Chemical Engineering, Jishou University, Jishou 416000, China |
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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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Keywords: | leaching kinetics ammonia-ammonium sulphate solution low-grade copper ore high-alkality gangues |
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