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Title

Dissolution of Nickel and Cobalt from Iron-Rich Laterite Ores Using Different Organic Acids

Year: 1399
COI: JR_JMAE-11-3_010
Language: EnglishView: 59
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Authors

M. Hosseini Nasab - School of Mining Engineering, College of Engineering, University of Tehran, Tehran, Iran
M. Noaparast - School of Mining Engineering, College of Engineering, University of Tehran, Tehran, Iran
H. Abdollahi - School of Mining Engineering, College of Engineering, University of Tehran, Tehran, Iran

Abstract:

Due to the decreasing production of nickel and cobalt from sulfide sources, the Ni and Co extraction from the oxide ores (laterites) have become more prevalent. In this research work, the effects of calcination prior to leaching, acid concentration, percent solid, pH, and stirring speed on the nickel and cobalt recoveries from an iron-rich laterite ore sample were investigated using different organic acids. Then the response surface methodology was implemented in order to optimize the various parameters. By the design of experiments, the compound optimal concentrations of the three different organic acids (gluconic acid: lactic acid: citric acid with a ratio of ۱:۲:۳) were ۳.۱۸ M, and S/L = ۰.۱, pH = ۰.۵, and the stirring speed = ۳۸۶ rpm. With the aid of kinetic studies, a temperature of ۷۵ °C, and a test time of ۱۲۰ minutes, the highest nickel and cobalt recoveries were ۲۵.۵% and ۳۷.۶%, respectively. In the optimal conditions, the contribution of the percent solids to the nickel recovery was the most and negative, after which the contribution of pH was negative, and finally, the acid concentration had a positive effect. In the optimal conditions, the acid concentration, pH, and solid content were, respectively, important in the cobalt recovery. The SEM results showed that the surface of feed and residue particles in the optimal conditions was not significantly different, and the laboratory data was fitted to a shrinking core model. The results obtained indicated that the reaction rate was controlled by the diffusion reaction at the particle surface, and the activation energies of ۱۱.۰۹ kJ/mol for nickel and ۲۸.۰۴ kJ/mol for cobalt were consistent with this conclusion

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This Paper COI Code is JR_JMAE-11-3_010. Also You can use the following address to link to this article. This link is permanent and is used as an article registration confirmation in the Civilica reference:

https://civilica.com/doc/1200394/

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Hosseini Nasab, M. and Noaparast, M. and Abdollahi, H.,1399,Dissolution of Nickel and Cobalt from Iron-Rich Laterite Ores Using Different Organic Acids,https://civilica.com/doc/1200394

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