期刊
HYDROMETALLURGY
卷 140, 期 -, 页码 71-76出版社
ELSEVIER
DOI: 10.1016/j.hydromet.2013.09.004
关键词
Kinetic; Fluoride; Mixed rare earth concentrate; Leaching
资金
- National Nature Science Foundation of China [51174115]
- National Outstanding Youth Science Foundation of China [51025416]
- Initial Special Research for 973 Program [2011CB411911]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT1065]
A mixed rare earth concentrate from Baotou was adopted to investigate the complex leaching kinetics of fluoride with a HCl-AlCl3 solution. In addition, we explored the effects of HCl concentration, AlCl3 concentration, temperature, reaction time, liquid-solid ratio and stirring speed on leaching kinetics of fluoride. The results showed that an extraction of about 99% was achieved under the leaching conditions: 4 M HCl, 1.5 M AlCl3, 85 degrees C, 20 ml/g liquid-solid ratio, 300 rpm stirring speed and 90 min. SEM and XRD analysis indicated that no new reaction solid product was formed on the surface of leaching residue particle. The apparent activation energy was 40.4 kJ/mol and the reaction orders with respect to hydrochloric acid concentrations, aluminum chloride concentrations and liquid-solid ratio were determined to be 1.66, 1.54 and 1.48, respectively. A semi-empirical rate equation was obtained to describe the process. The kinetic data fitted a new variant of the shrinking core model, in which both the interfacial transfer and diffusion through the product layer affected the reaction rate. (C) 2013 Elsevier B.V. All rights reserved.
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