Complex Permittivity and Microwave Absorption Properties of Zinc Oxide Leach Residues

ABSTRACT

Cylindrical cavity perturbation method was used to measure complex permittivity of zinc oxide leach residues (ZOLR) at frequency of 2.45 GHz. The results indicate that both dielectric constant and Loss factor of ZOLR increased with increased of 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 of moisture content. However, microwave absorption peak of ZOLR moves towards smaller material thickness with increasing of temperature. RL of ZOLR sensitively depends on material thickness of itself. If want to keeping microwave absorption properties of ZOLR greater than 90% in the process of microwave drying, 10 mm, 40 mm, and 50 mm should be selected as the optimum material thickness.

KEYWORDS:

• Complex permittivity
• microwave absorption properties
• reflection loss
• zinc oxide leach residues

Funding

The authors are grateful for financial support from National Natural Science Foundation of China (No. 51464024), Young and Middle-aged Academic Technology Leader Backup Talent Cultivation Program in Yunnan Province, China (2012HB008) and Yunnan Province Natural Science Foundation (2013FB096).

Acknowledgment

The authors are thankful for measurements of dielectric properties supported by Key Laboratory of Unconventional Metallurgy, Ministry of Education, Kunming University of Science and Technology, Kunming, China.

Additional information

Funding

The authors are grateful for financial support from National Natural Science Foundation of China (No. 51464024), Young and Middle-aged Academic Technology Leader Backup Talent Cultivation Program in Yunnan Province, China (2012HB008) and Yunnan Province Natural Science Foundation (2013FB096).