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

Kangqiang Li; Jin Chen; Jinhui Peng; Roger Ruan; Mamdouh Omran; Guo Chen

doi:10.1016/j.jhazmat.2019.121227

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

J Hazard Mater. 2020 Feb 15:384:121227. doi: 10.1016/j.jhazmat.2019.121227. Epub 2019 Sep 13.

Authors

Kangqiang Li¹, Jin Chen², Jinhui Peng³, Roger Ruan⁴, Mamdouh Omran⁵, Guo Chen⁶

Affiliations

¹ Key Laboratory of Unconventional Metallurgy, Ministry of Education, Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, PR China.
² Key Laboratory of Unconventional Metallurgy, Ministry of Education, Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, PR China. Electronic address: jinchen@kmust.edu.cn.
³ Key Laboratory of Unconventional Metallurgy, Ministry of Education, Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, PR China; Key Laboratory of Green-Chemistry Materials in University of Yunnan Province, Yunnan Minzu University, Kunming 650500, PR China.
⁴ Key Laboratory of Green-Chemistry Materials in University of Yunnan Province, Yunnan Minzu University, Kunming 650500, PR China; Center for Biorefining, Bioproducts and Biosystems Engineering Department, University of Minnesota, 1390 Eckles Ave., Saint Paul, MN 55108, USA.
⁵ Process Metallurgy Research Group, Faculty of Technology, University of Oulu, Finland.
⁶ Key Laboratory of Unconventional Metallurgy, Ministry of Education, Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, PR China; Key Laboratory of Green-Chemistry Materials in University of Yunnan Province, Yunnan Minzu University, Kunming 650500, PR China; Hunan Provincial Key Laboratory of Efficient and Clean Utilization of Manganese Resources, Central South University, Changsha 410083, Hunan, PR China. Electronic address: guochen@kmust.edu.cn.

PMID: 31628055
DOI: 10.1016/j.jhazmat.2019.121227

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 ε_r' 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.

Keywords: Dielectric properties; Heating characteristics; Manganese anode mud; Microwave heating; Thermochemical behavior.

Publication types

Research Support, Non-U.S. Gov't