@conference{
author = "Manojlović, Vaso and Kamberović, Željko and Jevtić, Sanja O. and Gajić, Nataša and Ranitović, Milisav and Milošević, Anđela and Đokić, Jovana",
year = "2021",
abstract = "In the hydrometallurgical process for getting the zine, after acid leaching, zinc-ferric sludge as the byproduct is further treated in the so-called jarosite procedure In the jarosite procedure, Pb and Ag are valorized, and Fe is removed through the residue. Besides Fe, in the jarosite residue, the other impurities are present (2n. Cu Ni, Cr, Co, As, Cd, Pb, 5b, Ge, Ga, In) which could be mobile in the environment causing the hazardous consequences [11]. The main goal of our research is to determine the activation energy of the decomposition of jarosite using thermogravimetry analysis. The thermogravimetric curve (IG) shows three segments, which indicate that the degradation of jarosite occurs in three steps. Below 200 °C, mass loss is 1.1%, due to adsorbed water evaporation. At an interval of 285-440 °C (with DTG maximum at 418 °C) deammonicifiation and dehydroxylation occurred. Also, structural water is released above 390 °C, so that three reactions occur simultaneously in this temperature range - which justifies the high activation energy on a - 0.3 and temperature of 420 °C (Figure b, c). Jarosite decomposed into ferrous sulfate and hematite with a weight loss of 22.6%. The mass loss in the range 520 to 750 °C (DTG maximum at 625 °C) is attributed to the loss of sulfate as $Oz. Two minima (420.1 and 625.9 °C) are observed on the DSC curve, which indicates that the process of jarosite decomposition is endothermic. The Fell could oxidize from intermediate phases, which is favorable to get Fe(ILD) that will later precipitate in the water. For kinetic analysis, we used Kissinger-Akahira Sunose (KAS) integral isoconversional method for the determination of Ea. The energy of activation changes with conversion, a, and the average value is 235.4 kJ/mol - which is higher than the literature 197.7 kJ/mol [2]; this is expected due to the complexity in the chemical composition of industrial jarosite residue.",
publisher = "Kosovska Mitrovica : Fakultet tehničkih nauka",
journal = "Deseti simpozijum o termodinamici i faznim dijagramima",
title = "Isoconversional analysis of jarosite residue thermal decomposition",
url = "https://hdl.handle.net/21.15107/rcub_cherry_6297"
}