Abstract
The decomposition of the solid solution KFe3(SO4)2-x(CrO4)x(OH)6 and its capacity to detain CrO 2-4 under alkaline conditions were studied. A solution of Ca(OH)2 was the media used. The incorporation of CrO 2-4 in crystalline structure of jarosite, resulted in a solid solution with the following approximate formula: [K0.86(H3O)0.14]Fe2.67[(SO4)1.23(CrO4)0.77][(OH)5.01(H2O)0.99]. The experimental data describe a reaction based in the model of decreasing core with chemical control. Decomposition curve shows an induction period, characterized by the formation of active centers where is initiated and established a reaction front, that is the beginning of the progressive conversion period, during which is formed a layer of inert products of Fe(OH)3 and is characterized for the massive diffusion of K+, SO 2-4 and CrO 2-4 toward the solution. However, the mappings by SEM-EDS from a particle decomposed partially, shows that the SO 2-4 is released preferentially, meanwhile, an important quantity of the CrO 2-4 is adsorbed in the layer of Fe(OH)3.
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Mireles, I. et al. (2015). Study of Behavioral about the Decomposition Reaction of the Solid Solution KFe3(SO4)2-x(CrO4)x(OH)6 in Ca(OH)2 Media. In: TMS 2015 144th Annual Meeting & Exhibition. Springer, Cham. https://doi.org/10.1007/978-3-319-48127-2_130
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DOI: https://doi.org/10.1007/978-3-319-48127-2_130
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