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.G.; Reyes, I.; Reyes, M.; Flores, V.H.; Juárez, J.C.; Pandiyan, T. The Behavior of Arsenic during the Thermal and Chemical Decomposition of the Ammonium–Arsenic Jarosite. Preprints2016, 2016100059. https://doi.org/10.20944/preprints201610.0059.v1
Flores, M.; Patiño, F.; Palacios, E.G.; Reyes, I.; Reyes, M.; Flores, V.H.; Juárez, J.C.; Pandiyan, T. The Behavior of Arsenic during the Thermal and Chemical Decomposition of the Ammonium–Arsenic Jarosite. Preprints 2016, 2016100059. https://doi.org/10.20944/preprints201610.0059.v1
Flores, M.; Patiño, F.; Palacios, E.G.; Reyes, I.; Reyes, M.; Flores, V.H.; Juárez, J.C.; Pandiyan, T. The Behavior of Arsenic during the Thermal and Chemical Decomposition of the Ammonium–Arsenic Jarosite. Preprints2016, 2016100059. https://doi.org/10.20944/preprints201610.0059.v1
APA Style
Flores, M., Patiño, F., Palacios, E.G., Reyes, I., Reyes, M., Flores, V.H., Juárez, J.C., & Pandiyan, T. (2016). The Behavior of Arsenic during the Thermal and Chemical Decomposition of the Ammonium–Arsenic Jarosite. Preprints. https://doi.org/10.20944/preprints201610.0059.v1
Chicago/Turabian Style
Flores, M., Julio C. Juárez and Thangarasu Pandiyan. 2016 "The Behavior of Arsenic during the Thermal and Chemical Decomposition of the Ammonium–Arsenic Jarosite" Preprints. https://doi.org/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.
Keywords
ammonium–arsenic jarosite; characterization; chemical decomposition and thermal decomposition
Subject
Engineering, Metallurgy and Metallurgical Engineering
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.