Effects of Sodium Peroxide Additives on Dielectric Properties and Microwave Roasting Mechanism of Zinc Sulfide Concentrate

Guangjun He; Wenwen Qu; Libo Zhang; C. Srinivasakannan; Chenhui Liu; Bingguo Liu; Kun Yang; Jinhui Peng; Shixing Wang

doi:10.1007/s11837-020-04050-6

Effects of Sodium Peroxide Additives on Dielectric Properties and Microwave Roasting Mechanism of Zinc Sulfide Concentrate

Guangjun He, Wenwen Qu, Libo Zhang, C. Srinivasakannan, Chenhui Liu, Bingguo Liu, Kun Yang, Jinhui Peng, Shixing Wang

Chemical and Petroleum Engineering

Research output: Contribution to journal › Article › peer-review

7 Scopus citations

Abstract

Microwave technology is being increasingly explored in metallurgical processes. The dielectric properties characterize the action mechanism between electromagnetic energy and minerals. Here, a cavity perturbation method was used to survey the dielectric properties of zinc sulfide concentrate with sodium peroxide additive from 20°C to 600°C at 2.45 GHz. The effects of sodium peroxide additives and temperature on the dielectric properties were investigated. Theoretical analyses showed that the zinc sulfide concentration could be heated quickly when the concentration of sodium peroxide was greater than or equal to 6 wt.%. The heating mechanism is mainly Joule heat loss caused by ionic conduction of sodium peroxide. The heating rate comes from energy conversion and heat conduction at temperatures higher than 400°C. Microwave heating experiments and phase formation verified the correctness of the theoretical analyses. The results provide a better understanding of the microwave roasting mechanism of zinc sulfide concentrate, but also support the use of sodium peroxide as a means to promote thermochemical treatments by microwave irradiation.

Original language	British English
Pages (from-to)	1920-1926
Number of pages	7
Journal	JOM
Volume	72
Issue number	5
DOIs	https://doi.org/10.1007/s11837-020-04050-6
State	Published - 1 May 2020

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title = "Effects of Sodium Peroxide Additives on Dielectric Properties and Microwave Roasting Mechanism of Zinc Sulfide Concentrate",

abstract = "Microwave technology is being increasingly explored in metallurgical processes. The dielectric properties characterize the action mechanism between electromagnetic energy and minerals. Here, a cavity perturbation method was used to survey the dielectric properties of zinc sulfide concentrate with sodium peroxide additive from 20°C to 600°C at 2.45 GHz. The effects of sodium peroxide additives and temperature on the dielectric properties were investigated. Theoretical analyses showed that the zinc sulfide concentration could be heated quickly when the concentration of sodium peroxide was greater than or equal to 6 wt.%. The heating mechanism is mainly Joule heat loss caused by ionic conduction of sodium peroxide. The heating rate comes from energy conversion and heat conduction at temperatures higher than 400°C. Microwave heating experiments and phase formation verified the correctness of the theoretical analyses. The results provide a better understanding of the microwave roasting mechanism of zinc sulfide concentrate, but also support the use of sodium peroxide as a means to promote thermochemical treatments by microwave irradiation.",

author = "Guangjun He and Wenwen Qu and Libo Zhang and C. Srinivasakannan and Chenhui Liu and Bingguo Liu and Kun Yang and Jinhui Peng and Shixing Wang",

note = "Funding Information: The authors gratefully acknowledge the support of National Program on Key Basic Research Project of China (Grant No. 2014CB643404), National Natural Science Foundation of China (Grant No. U1402274 and 51564033), Key Project of Applied Basic Research of Yunnan Province (Grant No. 2016FA023). Publisher Copyright: {\textcopyright} 2020, The Minerals, Metals & Materials Society.",

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doi = "10.1007/s11837-020-04050-6",

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T1 - Effects of Sodium Peroxide Additives on Dielectric Properties and Microwave Roasting Mechanism of Zinc Sulfide Concentrate

AU - He, Guangjun

AU - Qu, Wenwen

AU - Zhang, Libo

AU - Srinivasakannan, C.

AU - Liu, Chenhui

AU - Liu, Bingguo

AU - Yang, Kun

AU - Peng, Jinhui

AU - Wang, Shixing

N1 - Funding Information: The authors gratefully acknowledge the support of National Program on Key Basic Research Project of China (Grant No. 2014CB643404), National Natural Science Foundation of China (Grant No. U1402274 and 51564033), Key Project of Applied Basic Research of Yunnan Province (Grant No. 2016FA023). Publisher Copyright: © 2020, The Minerals, Metals & Materials Society.

PY - 2020/5/1

Y1 - 2020/5/1

N2 - Microwave technology is being increasingly explored in metallurgical processes. The dielectric properties characterize the action mechanism between electromagnetic energy and minerals. Here, a cavity perturbation method was used to survey the dielectric properties of zinc sulfide concentrate with sodium peroxide additive from 20°C to 600°C at 2.45 GHz. The effects of sodium peroxide additives and temperature on the dielectric properties were investigated. Theoretical analyses showed that the zinc sulfide concentration could be heated quickly when the concentration of sodium peroxide was greater than or equal to 6 wt.%. The heating mechanism is mainly Joule heat loss caused by ionic conduction of sodium peroxide. The heating rate comes from energy conversion and heat conduction at temperatures higher than 400°C. Microwave heating experiments and phase formation verified the correctness of the theoretical analyses. The results provide a better understanding of the microwave roasting mechanism of zinc sulfide concentrate, but also support the use of sodium peroxide as a means to promote thermochemical treatments by microwave irradiation.

AB - Microwave technology is being increasingly explored in metallurgical processes. The dielectric properties characterize the action mechanism between electromagnetic energy and minerals. Here, a cavity perturbation method was used to survey the dielectric properties of zinc sulfide concentrate with sodium peroxide additive from 20°C to 600°C at 2.45 GHz. The effects of sodium peroxide additives and temperature on the dielectric properties were investigated. Theoretical analyses showed that the zinc sulfide concentration could be heated quickly when the concentration of sodium peroxide was greater than or equal to 6 wt.%. The heating mechanism is mainly Joule heat loss caused by ionic conduction of sodium peroxide. The heating rate comes from energy conversion and heat conduction at temperatures higher than 400°C. Microwave heating experiments and phase formation verified the correctness of the theoretical analyses. The results provide a better understanding of the microwave roasting mechanism of zinc sulfide concentrate, but also support the use of sodium peroxide as a means to promote thermochemical treatments by microwave irradiation.

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JO - JOM

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ER -

Effects of Sodium Peroxide Additives on Dielectric Properties and Microwave Roasting Mechanism of Zinc Sulfide Concentrate

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