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Minerals 2017, 7(2), 31; https://doi.org/10.3390/min7020031

Dielectric Properties of Zinc Sulfide Concentrate during the Roasting at Microwave Frequencies

1,2,3,4,5
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2,3,4,5
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2,3,4,5
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2,3,4,5
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2,3,4,5
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2,3,4,5,* and 2,3,4,5,*
1
Faculty of Science, Kunming University of Science and Technology, Kunming 650500, China
2
State Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization, Kunming University of Science and Technology, Kunming 650039, China
3
Yunnan Provincial Key Laboratory of Intensification Metallurgy, Kunming 650093, China
4
National Local Joint Laboratory of Engineering Application of Microwave Energy and Equipment Technology, Kunming 650093, China
5
Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, China
*
Authors to whom correspondence should be addressed.
Academic Editor: William Skinner
Received: 6 December 2016 / Accepted: 4 February 2017 / Published: 21 February 2017
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Abstract

Microwave technology has a potential application in the extraction of zinc from sulphide ores, knowledge of the dielectric properties of these ores plays a major role in the microwave design and simulation for any process. The dielectric properties of zinc sulfide concentrate for two different apparent densities-1.54 and 1.63 g/cm3-have been measured by using the resonance cavity perturbation technique at 915 and 2450 MHz during the roasting process for the temperature ranging from room temperature to 850 °C. The variations of dielectric constant, the dielectric loss factor, the dielectric loss tangent and the penetration depth with the temperature, frequency and apparent density have been investigated numerically. The results indicate that the dielectric constant increases as the temperature increases and temperature has a pivotal effect on the dielectric constant, while the dielectric loss factor has a complicated change and all of the temperature, frequency and apparent density have a significant impact to dielectric loss factor. Zinc sulfide concentrate is high loss material from 450 to 800 °C on the basis of theoretical analyses of dielectric loss tangent and penetration depth, its ability of absorbing microwave energy would be enhanced by increasing the apparent density as well. The experimental results also have proved that zinc sulfide concentrate is easy to be heated by microwave energy from 450 to 800 °C. In addition, the experimental date of dielectric constant and loss factor can be fitted perfectly by Boltzmann model and Gauss model, respectively View Full-Text
Keywords: dielectric properties; microwave; zinc sulfide concentrate dielectric properties; microwave; zinc sulfide concentrate
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He, G.; Li, S.; Yang, K.; Liu, J.; Liu, P.; Zhang, L.; Peng, J. Dielectric Properties of Zinc Sulfide Concentrate during the Roasting at Microwave Frequencies. Minerals 2017, 7, 31.

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