Microwave Dielectric Properties and Reduction Behavior of Low-Grade Pyrolusite

Fei He, Jin Chen, Guo Chen, Jinhui Peng, C. Srinivasakannan, R. R Ruan

Research output: Contribution to journalArticle

Abstract

Manganese ore is an important mineral having a strategic role in the development of the national economy and society. In this study, the dielectric properties, heating curve, crystal structure, and reduction ratio of a low-grade pyrolusite were investigated. The dielectric constant, dielectric loss factor, and loss tangent coefficient of low-grade pyrolusite at room temperature were evaluated using the resonant cavity perturbation method, yielding values of 5.854, 0.146, and 0.0249, respectively. Owing to the excellent microwave absorption properties of low-grade pyrolusite with 10% coal (22 g), it could be heated to a temperature of 800°C within 200 s. X-ray diffraction results confirmed that MnO 2 was partially transformed into MnO at 450°C, while, at 650°C, no diffraction peak of MnO 2 was observed. At a reduction temperature of 550°C, a reduction ratio of MnO 2 to MnO of 96.65% could be achieved within a holding time of 50 min. This study demonstrates that the microwave carbothermal reduction of a low-grade pyrolusite is efficient, and thus could promote the clean production and sustainable development of the manganese industry.

Original languageEnglish (US)
JournalJOM
DOIs
StatePublished - Jan 1 2019

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Dielectric properties
Microwaves
Manganese
Carbothermal reduction
Cavity resonators
Dielectric losses
Temperature
Ores
Coal
Sustainable development
Permittivity
Minerals
Diffraction
Crystal structure
Heating
X ray diffraction
manganese dioxide
Industry

Cite this

Microwave Dielectric Properties and Reduction Behavior of Low-Grade Pyrolusite. / He, Fei; Chen, Jin; Chen, Guo; Peng, Jinhui; Srinivasakannan, C.; Ruan, R. R.

In: JOM, 01.01.2019.

Research output: Contribution to journalArticle

He, Fei ; Chen, Jin ; Chen, Guo ; Peng, Jinhui ; Srinivasakannan, C. ; Ruan, R. R. / Microwave Dielectric Properties and Reduction Behavior of Low-Grade Pyrolusite. In: JOM. 2019.
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abstract = "Manganese ore is an important mineral having a strategic role in the development of the national economy and society. In this study, the dielectric properties, heating curve, crystal structure, and reduction ratio of a low-grade pyrolusite were investigated. The dielectric constant, dielectric loss factor, and loss tangent coefficient of low-grade pyrolusite at room temperature were evaluated using the resonant cavity perturbation method, yielding values of 5.854, 0.146, and 0.0249, respectively. Owing to the excellent microwave absorption properties of low-grade pyrolusite with 10{\%} coal (22 g), it could be heated to a temperature of 800°C within 200 s. X-ray diffraction results confirmed that MnO 2 was partially transformed into MnO at 450°C, while, at 650°C, no diffraction peak of MnO 2 was observed. At a reduction temperature of 550°C, a reduction ratio of MnO 2 to MnO of 96.65{\%} could be achieved within a holding time of 50 min. This study demonstrates that the microwave carbothermal reduction of a low-grade pyrolusite is efficient, and thus could promote the clean production and sustainable development of the manganese industry.",
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