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Minerals 2016, 6(4), 98; https://doi.org/10.3390/min6040098

Study of the Extraction Kinetics of Lithium by Leaching β-Spodumene with Hydrofluoric Acid

1
Laboratorio de Metalurgia Extractiva y Síntesis de Materiales (MESiMat), Facultad de Ciencias Exactas y Naturales, Universidad Nacional de Cuyo, Mendoza 5500, Argentina
2
Instituto de Investigaciones en Tecnología Química (INTEQUI)-UNSL-CONICET, San Luis 5700, Argentina
*
Author to whom correspondence should be addressed.
Academic Editor: William Skinner
Received: 14 July 2016 / Revised: 19 September 2016 / Accepted: 20 September 2016 / Published: 26 September 2016
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Abstract

Parameters affecting the kinetics of the dissolution of β-spodumene with hydrofluoric acid have been investigated. The experimental tests were carried out in a closed vessel. The influence of several parameters, such as stirring speed, temperature, and reaction time were studied in order to deduce the kinetics of the dissolution reaction. The other parameters, particle size −45 μm; HF concentration 4% v/v, and the solid–liquid ratio 0.95% w/v were kept constant. The results indicate that the stirring speed does not have an important effect on the dissolution of the mineral above 330 rpm. The extent of the leaching of β-spodumene increases with temperature and reaction time augmentations. Scanning electron microscope (SEM) analyses of some residues in which the conversion was lower than 30% indicated a selective attack on certain zones of the particle. The treatment of the experimental data was carried out using the Modelado software. The model that best represents the dissolution of the mineral is the following: ln(1 − X) = −b1 [ln(1 + b2t) − b2t/(1 + b2t)]. This model is based on “nucleation and growth of nuclei” theory, and describes the style of attack physically observed by SEM on the residues. View Full-Text
Keywords: lithium; leaching; kinetics; hydrofluoric acid lithium; leaching; kinetics; hydrofluoric acid
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Rosales, G.D.; Ruiz, M.C.; Rodriguez, M.H. Study of the Extraction Kinetics of Lithium by Leaching β-Spodumene with Hydrofluoric Acid. Minerals 2016, 6, 98.

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