Preprint Article Version 1 NOT YET PEER-REVIEWED

The Behavior of Arsenic during the Thermal and Chemical Decomposition of the Ammonium–Arsenic Jarosite

  1. Área de Electromecánica Industrial, Universidad Tecnológica de Tulancingo, 43642 Tulancingo–Hgo., México
  2. Departamento en Ingeniería en Metalurgia y Materiales, ESIQIE, IPN, UPALM, Zacatenco, 07738 México, D.F., México
  3. Ingeniería en Energía, Universidad Politécnica Metropolitana de Hidalgo, Boulevard Acceso a Tolcayuca 1009, Ex Hacienda San Javier, 43860 Tolcayuca, Hgo., México
  4. Instituto de Metalurgia, Universidad Autónoma de San Luis Potosí, 78210 San Luis Potosí–SL, México
  5. Consejo Nacional de Ciencia y Tecnologia (CONACYT), Colonia Crédito Constructor Del. Benito Juárez, 03940 México–DF, México
  6. Área Académica de Ciencias de la Tierra y Materiales, UAEH, Carretera Pachuca−Tulancingo km 4.5, 42184 Mineral de la Reforma, Hidalgo, México
  7. Facultad de Química, UNAM, Ciudad Universitaria, 04510 México, D.F., México
Version 1 : Received: 14 October 2016 / Approved: 14 October 2016 / Online: 14 October 2016 (11:27:36 CEST)

How to cite: Flores, M.; Patiño, F.; Palacios, E.; Reyes, I.; Reyes, M.; Flores, V.; Juárez, J.; Pandiyan, T. The Behavior of Arsenic during the Thermal and Chemical Decomposition of the Ammonium–Arsenic Jarosite. Preprints 2016, 2016100059 (doi: 10.20944/preprints201610.0059.v1). Flores, M.; Patiño, F.; Palacios, E.; Reyes, I.; Reyes, M.; Flores, V.; Juárez, J.; Pandiyan, T. The Behavior of Arsenic during the Thermal and Chemical Decomposition of the Ammonium–Arsenic Jarosite. Preprints 2016, 2016100059 (doi: 10.20944/preprints201610.0059.v1).

Abstract

Arsenic, an element of environmental impact, can be incorporated into jarosite–type compounds and remain stabilised within the structure under a wide range of environmental conditions. In this study, a sample of ammonium–arsenic jarosite was synthesised by precipitation in sulphate medium at controlled pH of 1.2–1.8. The behaviour of arsenic during the thermal and chemical decomposition of jarosite was analysed; the degradation in alkaline medium of jarosite was also studied. According to the results, the synthesised jarosite is composed of joined rhombohedral crystals, forming tightly spherical shaped particles, 37–54 μm size. The ammonium jarosite produced possessed a high arsenic concentration; its calculated stoichiometry being (NH4)Fe2.45[(SO4)1.80(AsO4)0.20][(OH)4.15(H20)1.85]. It was found that arsenic is stabilised in the jarosite structure; upon heating, it remains in residual solids above 700°C, whilst in alkaline medium an incongruent dissolution takes place, with the arsenic retained in the solid phase along with iron. These solids, when exposed to high temperatures (1200°C), transform into a type of iron oxide known as hematite, so with arsenic it is retained an iron compound forming a stable compound which withstands high temperatures.

Subject Areas

ammonium–arsenic jarosite; characterization; chemical decomposition and thermal decomposition

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