Belgorod University of Cooperation, Economics and Law
Stary Oskol Technological Institute after A. A. Ugarov, National University of Science and Technology “MISiS” branch
employee
Belgorod, Belgorod, Russian Federation
from 01.01.2017 until now
Belgorod, Belgorod, Russian Federation
Belgorod, Belgorod, Russian Federation
Belgorod, Belgorod, Russian Federation
graduate student
Belgorod, Russian Federation
Belgorod, Russian Federation
Russian Federation
employee
Ukraine
UDK 66 Химическая технология. Химическая промышленность. Родственные отрасли
GRNTI 61.35 Технология производства силикатных и тугоплавких неметаллических материалов
BBK 35 Химическая технология. Химические производства
TBK 5541 Основные процессы и аппараты химической технологии
BISAC SCI013060 Chemistry / Industrial & Technical
The regularities of colemanite dehydration under non-isothermal conditions are investigated. It is established that colemanite, supplied to the Russian Federation from Turkey, has calcite in its composition. The chemical composition of colemanite is determined using the X-ray fluorescence analysis method. It is shown that the processes of dehydration of colemanite under non-isothermal conditions at a heating rate of 10 °С / min are accompanied by two endothermic effects at 660,7 K and 675,7 K with a total mass loss of 17,3 %. The rate of mass loss of colemanite from the temperature at heating up to 773 K, at which colemanite dehydrates and passes into the amorphous phase, is also studied. The regularities of changes in the rate of dehydration of colemanite are established. It is shown that the maximum values of the dehydration rate of colemanite are observed in the temperature range of 653–678 K. The activation energy of colemanite dehydration is determined to be 86,000 J/mol. Based on the experimentally obtained data, the rate constant of the colemanite dehydration process is calculated. The process of dehydration of colemanite is adequately described by the formal equation of kinetics. Most of the kinetic curve is adequately described by the resulting kinetic equation. It is proposed to describe the mechanism of dehydration of colemanite by a two-stage process, accompanied at the first stage by the removal of crystallization water, and at the second stage-by the removal of hydroxyl groups
colemanite, dehydration, non-isothermal conditions, activation energy, endothermic effects, kinetic equation
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