Open AccessStudy of desulphurization processes at heat treatmet of iron ore pellets
Author(s) -
B. P. Yur’ev,
В. А. Дудко
Publication year - 2018
Publication title -
černaâ metallurgiâ. bûlletenʹ naučno-tehničeskoj i èkonomičeskoj informacii/černaâ metallurgiâ. bûlletenʹ naučno-tehničeskoj informacii
Language(s) - English
Resource type - Journals
eISSN - 2619-0753
pISSN - 0135-5910
DOI - 10.32339/0135-5910-2018-11-21-28
Subject(s) - pellets , roasting , isothermal process , metallurgy , sulfur , sintering , pellet , pyrometallurgy , chemistry , materials science , mineralogy , thermodynamics , composite material , smelting , physics
Main reactions of iron ore pellets desulphurization are considered in details in a number of papers, in which the results obtained refer only to their isothermal heating. Therefore studies of authors were concentrated on desulphurization kinetics of nonfluxed and fluxed Sokolov-Sarbai and Kostomuksha pellets, having different content of initial Sulphur in concentrate at nonisothermal heating. Regime peculiarities of sulphuric pellets thermal treatment in a layer considered. Recommendations on roasting regime of pellets layer elaborated, which enable to decrease the sulfates decomposition degree. The mechanism and kinetics of calcium sulfate dissociation at temperatures and gas content, typical for conveyer and sintering machines, studied. The temperature level determined, at which maximum dissociation velocity of calcium sulfate is reached. Simulation of the process of pellets thermal treatment in air and in helium media realized. It was shown that at roasting in a lowoxidizing atmosphere the sulphur content in pellets, roasted at correspondent temperatures, was decreased considerably. Rational iron ore pellets roasting regimes elaborated aimed at their acceptable properties both by strength and by Sulphur content.