Kinetics of Reduction of α-Fe2O3 Nanopowder with Hydrogen under Power Mechanical Treatment in an Electromagnetic Field

Abstract

The kinetics of reduction of α-Fe₂O₃ nanopowder with hydrogen in an electromagnetic field with power mechanical treatment (PMT) in a vortex layer of ferromagnetic particles rotating in the field has been investigated. The kinetic parameters are calculated under the conditions of linear heating and isothermal conditions in accordance with the Freeman–Carroll and McKewan models, respectively. It is established that the electromagnetic field reduces the rate of reduction of the α-Fe₂O₃ nanopowder to 19% at 400°C, and PMT in a vortex layer intensifies the reduction process up to 4 times. The properties of the starting material and reduction products are studied using the thermogravimetry, X-ray diffraction, and electron microscopy methods.