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Alkaline Reactivity of Solid Solution of NH4-Na Jarosite with Arsenic

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TMS 2015 144th Annual Meeting & Exhibition

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Abstract

In this work, a kinetic analysis of the decomposition process of a solid solution of ammonium and sodium jarosite with arsenic incorporated into its structure in NaOH medium is presented. Atomic absorption spectroscopy (AAS), inductively coupled plasma optical emission spectroscopy (ICP-OES), elemental analysis and X-ray diffraction (XRD) were used for the characterization of the solid solution and the decomposition products. According to the results, the approximate stoichiometry of the jarosite synthesized is as follows: [(NH4)0.72Na0.06(H3O)0.21]Fe3 2.52(SO4)1.85(AsO4)0.15[(OH)4.41(H2O)1.59].

It was found that the alkaline decomposition reaction proceeds through an induction period (equation 1), followed by a progressive conversion period (equation 2).

$$\mathop - \limits_\theta = \frac{{{r_0}}}{{{V_m}}} \cdot 9.7684 \times {10^{10}} \cdot {e^{ - 65,030/RT}}{\left[ {O{H^ - }} \right]^{.22}} $$
((1))
$$1 - {\left( {1 - X} \right)^{1/3}} = 3.4395 \times {10^6} \cdot {e^{ - 51,580/RT}}{\left[ {O{H^ - }} \right]^{0.94}}t $$
((2))

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Authors and Affiliations

  1. Departamento de Ingeniería en Metalurgia y Materiales, ESIQIE, UPALM, Instituto Politécnico Nacional, México D.F. 07738, México

    Víctor Flores, Elia Palacios & Mizraim Flores

  2. Área Académica de Ciencias de la Tierra y Materiales, Universidad Autónoma del Estado de Hidalgo, Carretera Pachuca-Tulancingo Km 4.5, Mineral de la Reforma, 42184, Hidalgo, México

    Francisco Patiño, Martin Reyes & Julio Juárez

  3. Instituto de Metalurgia, Universidad Autónoma de San Luis Potosí, Av. Sierra Leona No. 550, Lomas 2da Sección, 78210, San Luis Potosí, S. L. P., México

    Iván Reyes

  4. Área de Electromecánica Industrial, Universidad Tecnológica de Tulancingo, Camino a Ahuehuetitla 301 Col. Las Presas, Tulancingo, 43642, Hidalgo, México

    Mizraim Flores

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  1. Víctor Flores
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  7. Julio Juárez
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Flores, V. et al. (2015). Alkaline Reactivity of Solid Solution of NH4-Na Jarosite with Arsenic. In: TMS 2015 144th Annual Meeting & Exhibition. Springer, Cham. https://doi.org/10.1007/978-3-319-48127-2_131

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