Temperature Rise Characteristics of Carbon-Containing Chromite Ore Fines in Microwave Field Original Research Article

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 °C in 7 min, at a temperature rise rate of 157. 1 (°C · min−1 · kg−1), whereas the temperature of 1 kg carbon-containing magnetite ore fines rose only up to 1 000 °C in 10 min, at a temperature rise rate of 100 (°C · min−1 · kg−1). With increasing carbon-fitting ratios and by adding calcic lime, their heating effects changed regularly.