Abstract
Kinetic features of the reduction of ammonium paramolybdate in pure hydrogen and in a mixture of hydrogen and nitrogen with a ratio of 1: 0.5–1.0 in the temperature range of 250–950°C with a gas supply rate of 1–3 L/min are investigated. The optimum conditions for performing this process in hydrogen-nitrogen media that ensure a no lower than 90% recovery of the target phase are established. The evolution of forming the nano- and microcrystalline molybdenum powders via the reduction of ammonium paramolybdate in hydrogen-nitrogen media is investigated. The dependence of the granulometric composition and morphology of powder samples on the type of the reduction atmosphere is shown. During high-temperature (880–900°C) reduction in a hydrogen-nitrogen medium (composition, 1: 1), numerous crystallization centers with the formation of molybdenum grains through pseudomorphic transformation are observed in the powders.
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