To avoid the nonuniform phenomena of heat and mass transfer of metallurgical powdery materials caused by conventional heating method, the temperature rise characteristics of carbon-containing chromite ore fines in the microwave field were investigated using microwave heating in a microwave metallurgical furnace. The experimental results show that the carbon-containing chromite ore fines have better temperature rise characteristics in the microwave field at a frequency of 2. 45 GHz. After heated in the microwave field of 10 kW, the temperature of 1 kg carbon-containing chromite ore fines rose up to 1 100 ℃ in 7 min, at a temperature rise rate of 157. 1 (℃ • min~(-1) • kg~(-1)), whereas the temperature of 1 kg carbon-containing magnetite ore fines rose only up to 1 000 ℃ in 10 min, at a temperature rise rate of 100 (℃• min~(-1) • kg~(-1)). With increasing carbon-fitting ratios and by adding calcic lime, their heating effects changed regularly.
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