Kinetics Study of Alkaline Decomposition of Rubidium Jarosite in Ca(OH)2 Media
Salinas Rodríguez, Eleazar
2011
Eduardo Cerecedo S., Eleazar Salinas R., Luis C. Longoria G., Francisco R. Carrillo P., Juan Hernández A. 30. Kinetics Study of Alkaline Decomposition of Rubidium Jarosite in Ca(OH)2. 2011 TMS Annual Meeting & Exhibition. Symposium: Hydrometallurgy Fundamentals and Applications. Supplemental Proceedings: Volume 1: Materials Processing and Energy Materials. TMS (The Minerals, Metals & Materials Society), 2011. ISBN: 978-1-11802-946-6. Pag. 291-298.
Abstract
Rubidium jarosite was synthesized, leading a single phase product, composed principally by particles of spherical morphology with sizes varying from 25 to 40 microns forming aggregates of rombohedral crystals strongly soldered in a compact texture. This compound has the following contents: 28.31% Fe, 35.30% SO4, 13.62% Rb, 5.57 ppm Ag and 22.74% (H3O + OH). Leading the approximated formula: [Rb0.2722 (H3O)0.1423 Ag0.000039] Fe3 (SO4)2 (OH)6. By the other hand, the nature of alkaline decomposition process of rubidium jarosite is characterized by an induction period followed by a progressive conversion period where sulphate and rubidium ions go to solution, leaving in residue the iron as amorphous hydroxide. Finally, the global process of alkaline decomposition of rubidium jarosite in Ca(OH)2 media, has an order of reaction with respect to Ca(OH)2 concentration of n=0.42, with an activation energy found of 99.10 kJ/mol, which can confirms that the process is controlled by chemical reaction.