The kinetics of voluminal reduction of chromium ore fines containing coal (COFCC) by microwave heating was studied. When the molar ratio of carbon to oxygen was 084 and that of CaO to SiO2 was 039 in COFCC, the temperaturerising rate of COFCC by microwave heating was 625 ℃/min, 6875 ℃/min, 7059 ℃/min, and 7222 ℃/min at 1 000 ℃, 1 100 ℃, 1 200 ℃, and 1 300 ℃, respectively. The results show that the voluminal reduction of COFCC by microwave heating at solidsolid phase is first order reaction, with the apparent activation energy of 51480 kJ/mol. The limiting step of reaction rate for the overall reaction is the mass transfer of CO in the reduced product layer between dielectric particles of chromium ore and coal.
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