Dielectric properties and thermal behavior of electrolytic manganese anode mud in microwave field
Li, Kangqiang; Chen, Jin; Peng, Jinhui; Ruan, Roger; Omran, Mamdouh; Chen, Guo (2019-09-13)
Kangqiang Li, Jin Chen, Jinhui Peng, Roger Ruan, Mamdouh Omran, Guo Chen, Dielectric properties and thermal behavior of electrolytic manganese anode mud in microwave field, Journal of Hazardous Materials, Volume 384, 2020, 121227, ISSN 0304-3894, https://doi.org/10.1016/j.jhazmat.2019.121227
© 2019. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/.
https://creativecommons.org/licenses/by-nc-nd/4.0/
https://urn.fi/URN:NBN:fi-fe2020040710669
Tiivistelmä
Abstract
Exploring the dielectric properties of a material can provide guidance for applications of microwave technology to the material. In this work, dielectric properties and thermal behavior of manganese anode mud and pure MnO₂, CaSO₄ and PbSO₄ components were systematically investigated. Results indicated that manganese anode mud showed excellent responsiveness to microwaves, with εr′ value of 17.971 (F/M) at room temperature and a maximum value of 20.816 (F/M) at 150 °C, rendering it took only 5.5 min for manganese anode mud to be heated from room temperature to 1000 °C. The dielectric properties of manganese anode mud were related to its thermal behavior, mainly affected by MnO₂ component. Moreover, the heating process of manganese anode mud was divided into four stages identified by temperatures: less than 200 °C, 200 °C–700 °C, 700 °C–900 °C, greater than 900 °C, corresponding to the five stages of thermal behavior: the removal of absorption water and combined water, the decomposition reaction of Pb₂Mn₈O16, and the deoxidation reactions of PbO₂, MnO₂ and Mn3O₄. The work highlights the feasibility of processing manganese anode mud by microwave heating.
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