Complex permittivity and microwave absorption properties of zinc oxide leach residues.

Cylindrical cavity perturbation method was used to measure complex permittivity of zinc oxide leach residues (ZOLR) at a frequency of 2.45 GHz. The results indicate that both dielectric constant and loss factor of ZOLR increased with an increase in temperature and moisture content. The research of ZOLR’s microwave absorption properties were performed based on reflection loss (RL) theory. Microwave absorption peak of ZOLR moves towards higher material thickness with decreasing moisture content. However, microwave absorption peak of ZOLR moves towards smaller material thickness with increasing temperature. RL of ZOLR sensitively depends on its material thickness. In order to keep microwave absorption properties of ZOLR greater than 90% in the process of microwave drying, then 10 mm, 40 mm, and 50 mm should be selected as the optimum material thickness.
Cylindrical cavity perturbation method was used to measure complex permittivity of zinc oxide leach residues (ZOLR) at a frequency of 2.45 GHz. The results indicate that both dielectric constant and loss factor of ZOLR increased with an increase in temperature and moisture content. The research of ZOLR’s microwave absorption properties were performed based on reflection loss (RL) theory. Microwave absorption peak of ZOLR moves towards higher material thickness with decreasing moisture content. However, microwave absorption peak of ZOLR moves towards smaller material thickness with increasing temperature. RL of ZOLR sensitively depends on its material thickness. In order to keep microwave absorption properties of ZOLR greater than 90% in the process of microwave drying, then 10 mm, 40 mm, and 50 mm should be selected as the optimum material thickness.