University of Oulu

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

Dielectric properties and thermal behavior of electrolytic manganese anode mud in microwave field

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Author: Li, Kangqiang1; Chen, Jin1; Peng, Jinhui1,2;
Organizations: 1Key Laboratory of Unconventional Metallurgy, Ministry of Education, Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, PR China
2Key Laboratory of Green-Chemistry Materials in University of Yunnan Province, Yunnan Minzu University, Kunming 650500, PR China
3Center for Biorefining, Bioproducts and Biosystems Engineering Department, University of Minnesota, 1390 Eckles Ave., Saint Paul, MN 55108, USA
4Process Metallurgy Research Group, Faculty of Technology, University of Oulu, Finland
5Hunan Provincial Key Laboratory of Efficient and Clean Utilization of Manganese Resources, Central South University, Changsha 410083, Hunan, PR China
Format: article
Version: accepted version
Access: embargoed
Persistent link: http://urn.fi/urn:nbn:fi-fe2020040710669
Language: English
Published: Elsevier, 2020
Publish Date: 2021-09-13
Description:

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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Series: Journal of hazardous materials
ISSN: 0304-3894
ISSN-E: 1873-3336
ISSN-L: 0304-3894
Volume: 384
Article number: 121227
DOI: 10.1016/j.jhazmat.2019.121227
OADOI: https://oadoi.org/10.1016/j.jhazmat.2019.121227
Type of Publication: A1 Journal article – refereed
Field of Science: 215 Chemical engineering
Subjects:
Funding: Financial supports from the National Natural Science Foundation of China (No: U1802255), the Key Projects in the National Science & Technology Pillar Program during the Twelfth Five-year Plan Period (No. 2015BAB17B00), the Hunan Provincial Science and Technology Plan Project, China (No. 2016TP1007), and Innovative Research Team (in Science and Technology) in University of Yunnan Province were sincerely acknowledged.
Copyright information: © 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/