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The kinetics of hydrogen reduction of solid magnetite concentrate particles is determined in the temperature range 1150–1350 °C as part of the development of a novel ironmaking process on‐going at University of Utah. A laminar‐flow reactor is used to provide the most uniform conditions to measure as accurately as possible the very rapid kinetics of the reduction reaction. Reduction degrees greater than 90% are achieved in a few seconds of residence time, depending on experimental conditions, which are the typical lengths of time available in a flash reaction process. Different particle size fractions are used in the experiments under various hydrogen partial pressures and residence times. The nucleation and growth model with Avrami parameter n = 1 and first‐order dependence on hydrogen partial pressure describes the reduction kinetics. The kinetics have no particle size effect within the size range and reaction conditions tested. The rate equation obtained from this work is being applied to the analysis of the data obtained from a laboratory flash reactor as well as to the design of industrial‐size flash ironmaking reactor in which hydrogen generated from the partial oxidation of natural gas is the main reducing agent.

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