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Open AccessCommunication

Extraction of Potassium from Microcline by Chlorination

by Pablo Orosco 1,3,*, Oriana Barrios 2,3 and Manuel Ojeda 2,3
Centro de Investigación y Desarrollo en Materiales Avanzados y Almacenamiento de Energía de Jujuy (CIDMEJu), Av. Juan A. Rojas S/N, Jujuy Y4612, Argentina
Instituto de Investigaciones en Tecnología Química (INTEQUI), Almirante Brown 1455, San Luis D5700, Argentina
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;
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)
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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Orosco, P.; Barrios, O.; Ojeda, M. Extraction of Potassium from Microcline by Chlorination. Minerals 2019, 9, 295.

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