The Dielectric and The Temperature-rising Characteristics of Ore Fines Materials in Microwave Field

By testing the dielectric constant and the dielectric loss factor of concentrated Dahongshan, millscale, anthracite and light-burned dolomite in different frequency and temperature, and by studying the temperature-rising characteristics of the materials in the microwave field of 2.45GHz in frequency, the research in the paper shows that to reach at 1250 degrees C under the same condition - 2KW the microwave power and 30g the mass - the time concentrated Dahongshan takes is 330s, whereas the millscale is 855s and the anthracite is 820s. About the last one, the higher the temperature is, the stronger the absorptivity is. After the temperature has rose to 400 degrees C, the anthracite's absorptivity increases dramatically. The result of the research would serve as the foundation of the further study on making direct reduced iron by microwave heating.