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Extraction of Potassium from Microcline by Chlorination

1
Centro de Investigación y Desarrollo en Materiales Avanzados y Almacenamiento de Energía de Jujuy (CIDMEJu), Av. Juan A. Rojas S/N, Jujuy Y4612, Argentina
2
Instituto de Investigaciones en Tecnología Química (INTEQUI), Almirante Brown 1455, San Luis D5700, Argentina
3
Facultad de Química, Bioquímica y Farmacia, Universidad Nacional de San Luis, Chacabuco y Pedernera, San Luis D5700, Argentina
*
Author to whom correspondence should be addressed.
Minerals 2019, 9(5), 295; https://doi.org/10.3390/min9050295
Received: 11 March 2019 / Revised: 5 April 2019 / Accepted: 17 April 2019 / Published: 15 May 2019
(This article belongs to the Section Mineral Processing and Metallurgy)
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Abstract

A pyrometallurgical route for the extraction of potassium from microcline was investigated. The reagents used were microcline, calcite and chlorine gas. Isothermal and non-isothermal chlorination assays were performed using experimental equipment adapted for working in corrosive atmospheres. The effects of temperature and reaction time on the chlorination reaction of the microcline-calcite mixture were studied. The reaction mechanism was also investigated. The techniques used to characterize reagents and products were thermogravimetric analysis (TGA), X-ray diffraction (XRD), scanning electron microscopy (SEM), and electron probe microanalysis (EPMA). The experimental results showed that the extraction of potassium in the form of KCl begins at 700 °C for 15 min. Anorthite also starts to be produced under these conditions. The optimum conditions for quantitative extraction of potassium and selective formation of anorthite were 900 °C for 60 min. View Full-Text
Keywords: extraction; potassium; chlorination; microcline; calcite extraction; potassium; chlorination; microcline; calcite
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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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Orosco, P.; Barrios, O.; Ojeda, M. Extraction of Potassium from Microcline by Chlorination. Minerals 2019, 9, 295.

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