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Leaching kinetics of low-grade copper ore containing calcium-magnesium carbonate in ammonia-ammonium sulfate solution with persulfate

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Transactions of Nonferrous Metals Society of China 2012年第11期22卷 2822-2830页

作者：刘志雄尹周澜胡慧萍陈启元中南大学化学化工学院长沙410083 吉首大学化学化工学院吉首416000

The leaching kinetics of copper from low-grade copper ore was investigated in ammonia-ammonium sulfate solution with sodium persulfate. The effect parameters of stirring speed, temperature, particle size, concentrations of ammonia, ammonium sulfate and sodium persulfate were determined. The results show that the leaching rate is nearly independent of agitation above 300 r/min and increases with the increase of temperature, concentrations of ammonia, ammonium sulfate and sodium persulfate. The EDS analysis and phase quantitative analysis of the residues indicate that bornite can be dissolved by persulfate oxidization. The leaching kinetics with activation energy of 22.91 kJ/mol was analyzed by using a new shrinking core model （SCM） in which both the interfacial transfer and diffusion across the product layer affect the leaching rate. A semi-empirical rate equation was obtained to describe the leaching process and the empirical reaction orders with respect to the concentrations of ammonia, ammonium sulfate and sodium persulfate are 0.5, 1.2 and 0.5, respectively.

关键词： low-grade copper ore calcium-magnesium carbonate leaching kinetics ammoniacal solution sodium persulfate activation energy shrinking cure model

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

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Journal of Central South University 2012年第1期19卷 77-84页

作者： LIU Zhi-xiong YIN Zhou-lan HU Hui-ping CHEN Qi-yuan School of Chemistry and Chemical Engineering Central South UniversityChangsha 410083China College of Chemistry and Chemical Engineering Jishou UniversityJishou 416000China

The leaching kinetics of low-grade copper ore with high-alkality gangues was studied in ammonia-ammonium sulphate *** main parameters,such as ammonia and ammonium sulphate concentrations,particle size,solid-to-liquid ratio and reaction temperature,were chosen in the *** results show that the increase of temperature,concentrations of ammonia and ammonium sulphate is propitious to the leaching rate of copper *** leaching rate increases with the decrease of particle size and solid-to-liquid *** 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.

关键词： leaching kinetics ammonia-ammonium sulphate solution low-grade copper ore high-alkality gangues

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