@conference{
author = "Janković, Bojan and Janković, Marija and Krneta Nikolić, Jelena and Rajačić, Milica and Vukanac, Ivana and Sarap, Nataša and Manić, Nebojša",
year = "2023",
abstract = "In this work, the thermal decomposition process of coal bottom ash (collected after lignitecombustion in coal-fired power plant “Kostolac B” (TEKO-B), Serbia) was investigated, usingsimultaneous TG (thermogravimetry) – DTG (derivative thermogravimetry) techniquesin an inert (Ar) atmosphere, at various heating rates (10.3, 20.9 and 32.1 K/min). In additionto thermal characterization of the sample, the chemical composition and naturally occurredradionuclides were also determined. Using the model-free (isoconversional) (by Friedman(FR), Kissinger-Akahira-Sunose (KAS), Ozawa-Flynn-Wall (OFW) and Vyazovkin (VY)methods) analysis, the complex kinetic nature of the process was successfully resolved. Theconducted numerical optimization of the process (using non-linear least square optimization)had confirmed accuracy and reliability of estimated kinetic parameters. Model-based(model-fitting) kinetic analysis showed the existence of a complex reaction scheme, overtwo consecutive reactions steps and one single-stage reaction step, via mechanism order An,F2, Fn, R3, Cnm (through n-dimensional nucleation/growth, chemical reactions, and n-thorder and m-power with autocatalysis mechanisms). Through physicochemical interpretationof mechanism scheme, an assessment of recovery of valuable metals and metal oxides wasperformed, by analysing the concentration of reaction species in a function of temperature ofindividual steps. Likewise, the influence of certain precursor involved in decomposition processas catalyst (in order to increase the yield of targeted product) was also inspected. Finally,the simulation of actual process using the results obtained from applied methods/models wasperformed, through application of modulated dynamic (MD) prediction.",
publisher = "Budapest : Akadémiai Kiadó",
journal = "JTACC 2023 : 3rd Journal of Thermal Analysis and Calorimetry Conference and 9th V4 (Joint Czech-Hungarian-Polish-Slovakian) Thermoanalytical Conference : Book of asbtracts",
title = "Recovering of metals and metal oxides through thermal decomposition process of coal bottom ash: a comprehensive kinetic analysis",
pages = "263-263",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12589"
}