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VERSION:2.0
METHOD:PUBLISH
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ORGANIZER;CN='8th ECIC & 9th ICSTI 2022':MAILTO:info@ecic-icsti.com
LOCATION:Room „Borgward“
SUMMARY:Influence of Oxygen Partial Pressure on High Temperature Oxidation Behavior of Iron Bearing Materials in Iron Ore Sintering Bed
DESCRIPTION:Reduction of CO2 emissions has been strongly required for the ironmaking processes. In the sintering process of iron ores, coke breeze is utilized as main agglomeration agent. Its replacement with iron bearing materials such as metallic iron, wustite and magnetite is a promising way to reduce CO2 emissions from the process. Most of coke particles disappear due to combustion, while iron bearing materials remain in the sintering bed as their oxidized phases after heat generation through their oxidation reactions. Therefore, iron bearing materials will significantly affect the permeability of sintering bed and quality of produced sinter. Since the oxygen partial pressure in the sintered bed decreases with the combustion of coke, it is necessary to understand the oxidation behavior of the iron bearing materials under lower oxygen partial pressure conditions. In this study, influence of oxygen partial pressure on the high temperature oxidation of metallic iron was examined to evaluate the possibility to utilize it as an agglomeration agent. 
Thin plate samples of metallic iron were heated up to 1200℃ under N2 atmosphere by using TG. After reaching to the holding temperature, atmosphere was changed to the oxygen partial pressure of 0.001 - 0.21 atm, which was controlled by using N2 or CO2 gas. Thickness of wustite layer formed at the sample surface increased up to 300 s and follows parabolic manner. The wustite layer thickness decreases after 300 s, instead the thicknesses of magnetite and hematite layers drastically increased. It appears that the rate-determining step is changed when all metallic iron is oxidized to wustite. At PO2 = 0.01 atm, only wustite layer is observed and the oxidation proceeds in the CO2 base than in the N2. It implies that O2 is supplied by the decomposition reaction of CO2 gas. 

CLASS:PUBLIC
DTSTART:20220631T170500
DTEND:20220631T173000
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