The kinetics of CO reduction of magnetite concentrate particles was investigated in drop-tube reactors (DTR) to obtain a rate equation for the design and analysis of a flash ironmaking reactor. The effect of CO partial pressure was determined and temperature was varied from 1473 K to 1873 K in few seconds of residence time similar to that in a typical flash reactor. The experimental data were divided into two temperature ranges, below 1623 K and above where the magnetite concentrate melts. The reduction degrees achieved at temperatures below 1623 K were under 50%, while significant reduction degrees (higher than 85%) were achieved at higher temperatures. Computational fluid dynamics (CFD) analysis was employed to improve the accuracy of the rate expressions. It was determined that the nucleation and growth kinetics best describes the investigated reaction. The activation energy was 451 and 88 kJ mol−1, respectively, below and above 1623 K.
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