THERMAL SCIENCE

International Scientific Journal

Hui Liu

,

Chenglang Xiang

,

Rui Hong

,

Yimeng Song

,

Kan Jin

,

Kai Zhu

,

Chun Yang

,

Chen Lv

THERMAL BEHAVIOR AND KINETICS OF SULFIDE CONCENTRATES

ABSTRACT
Thermal behavior of sulfide concentrates can give rise to many serious problems in its storage and transportation. In order to uncover the thermal behavior of sulfide concentrates, as well as obtain the kinetic parameters, four representative samples were tested using TG-DTG-DSC techniques in the presence of oxygen from 20℃ to 1000℃ and with three different heating rates of 5, 10, and 15℃ per minute. Meanwhile, corresponding activation energies of sulfide concentrates were also determined by the Coats-Redfern method (199.4-234.9 kJmol–1 for Sample 1, 203.6-235.9 kJmol–1 for Sample 2, 234.7-255.6 kJmol–1 for Sample 3, and 199.7-254.9 kJmol–1 for Sample 4). Results indicate that the heating rate is an important factor affecting the thermal behavior of sulfide concentrates. The peak temperature corresponding to the maximum mass loss rate of the ore sample at different heating rates is different and the sulfide concentrates at heating rate of 5℃ per minute is more prone to spontaneous combustion. Furthermore, this thermodynamic method was demonstrated to be effective for investigating and predicting the thermal behavior of sulfide concentrate and the activation energy index was reasonable for determining its spontaneous combustion tendency.
KEYWORDS
sulfide concentrates, coats-Redfern integration method, thermal behavior, kinetics, activation energy
PAPER SUBMITTED: 2018-12-28
PAPER REVISED: 2019-02-25
PAPER ACCEPTED: 2019-03-01
PUBLISHED ONLINE: 2019-05-18
DOI REFERENCE: https://doi.org/10.2298/TSCI181228194L
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2019, VOLUME 23, ISSUE Issue 5, PAGES [2801 - 2811]
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Thermal behavior and kinetics of sulfide concentrates

© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence