@inproceedings{42155da701e74f09a752afd4f7b7128b,
title = "Kinetic and thermochemical analysis of rubidium jarosite decomposition in alkaline media",
abstract = "Single phase rubidium jarosite was synthesized by precipitation from aqueous solution. X-ray diffraction and SEM-EDS analyses showed that the synthetic rubidium jarosite formed in subspherical particles with an average particle size of about 35 μm. The chemical analysis showed an approximate composition of Rb0.9432Fe3(SO4) 2.1245(OH)6. The decomposition behaviour of the jarosite in terms of solution pH was thermodynamically modeled using FACTSage by constructing the potential-pH diagram at 298.15 K. The E-pH diagram showed that the decomposition of jarosite leads to goethite (FeO•OH) together with Rb+ and SO42- ions. The experimental decomposition of the Rb-jarosite was carried out in alkaline solutions with five different Ca(OH)2 concentrations. The decomposition process showed an {"}induction period{"} followed by a progressive conversion period where the Rb+ and SO42- ions formed in the aqueous solution. In contrast, calcium was incorporated in the solid residue and iron was transformed into amorphous ferrihydrite. The kinetic analysis showed that this process can be represented by the unreacted-core chemically controlled model. The reaction order with respect to Ca(OH)2 is 0.4342 and the calculated activation energy is 98.70 kJ mol-1.",
keywords = "Kinetics, Rubidium jarosite, Thermochemistry",
author = "M. P{\'e}rez-Labra and A. Romero-Serrano and E. Salinas-Rodriguez and {\'A}vila-D{\'a}vila, {E. O.} and G. Ju{\'a}rez-L{\'o}pez and J. Hern{\'a}ndez-{\'A}vila",
year = "2012",
doi = "10.1002/9781118364833.ch40",
language = "Ingl{\'e}s",
isbn = "9781118291238",
series = "TMS Annual Meeting",
publisher = "Minerals, Metals and Materials Society",
pages = "447--460",
booktitle = "T.T. Chen Honorary Symposium on Hydrometallurgy, Electrometallurgy and Materials Characterization - Held During the TMS 2012 Annual Meeting and Exhibition",
address = "Estados Unidos",
note = "T.T. Chen Honorary Symposium on Hydrometallurgy, Electrometallurgy and Materials Characterization - TMS 2012 Annual Meeting and Exhibition ; Conference date: 11-03-2012 Through 15-03-2012",
}