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• W4214857510 endingPage "107459" @default.
• W4214857510 startingPage "107459" @default.
• W4214857510 abstract "With the aim of reducing CO2 emissions in basic industries, the sector of iron and steel metallurgy is also faced with the question of how carbon can be replaced in ore reduction. By means of in-situ observation, this study investigates the direct reduction (DR) of individual iron ore pellets under an atmosphere of hydrogen (H2) and carbon monoxide (CO) and at temperatures between 800 °C and 1100 °C at atmospheric pressure. The progress of the reduction, i.e. the phase change and the structural change, is analysed by X-ray diffraction (XRD) and scanning electron microscopy equipped with energy-dispersive X-rays (SEM-EDX). To evaluate the porosities of the pellets, analytical porosimetry is compared to optical porosimetry findings obtained by analysing images of sections in the SEM (hereinafter called SEM porosimetry). Furthermore, the swelling behaviour is evaluated by video analysis and the reduction swelling index (RSI) is determined. The results show a higher reduction progress and a higher RSI under H2 atmosphere than under CO atmosphere. Higher temperatures lead to faster reduction progress and to significant changes in the structural composition of the reduced pellets." @default.
• W4214857510 created "2022-03-05" @default.
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• W4214857510 date "2022-04-01" @default.
• W4214857510 modified "2023-10-16" @default.
• W4214857510 title "Direct reduction of iron ore pellets by H2 and CO: In-situ investigation of the structural transformation and reduction progression caused by atmosphere and temperature" @default.
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• W4214857510 doi "https://doi.org/10.1016/j.mineng.2022.107459" @default.
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