University of Oulu

Kangqiang Li, Guo Chen, Xiteng Li, Jinhui Peng, Roger Ruan, Mamdouh Omran, Jin Chen, High-temperature dielectric properties and pyrolysis reduction characteristics of different biomass-pyrolusite mixtures in microwave field, Bioresource Technology, Volume 294, 2019, 122217, ISSN 0960-8524,

High-temperature dielectric properties and pyrolysis reduction characteristics of different biomass-pyrolusite mixtures in microwave field

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Author: Li, Kangqiang1; Chen, Guo1,2; Li, Xiteng1;
Organizations: 1Faculty 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
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 1.3 MB)
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Language: English
Published: Elsevier, 2019
Publish Date: 2021-09-29


Exploring the dielectric properties of mineral-biomass mixtures is fundamental to the coupled application with biomass pyrolysis and microwave technology to mineral reduction. In this work, the microwave dielectric properties of five pyrolusite-biomass mixtures were measured by resonant cavity perturbation technique and the pyrolysis reduction characteristics were systematically investigated, including poplar, pine, ageratina adenophora, rapeseed shell and walnut shell. Results indicated that the dielectric properties commonalities of five mixtures with temperature represented by increasing firstly, dropping intensely and finally rising slightly, with excellent responsiveness to microwaves; which the change trend was mainly attributed to the crystal transformation of amorphous MnO₂ and pyrolusite reduction reactions by biomass pyrolysis. Meanwhile, the heating characteristics successfully matched the dielectric properties of the mixtures, and the pyrolusite reduction process by biomass can be divided into two stages: biomass pyrolysis and pyrolusite reduction. The work highlights the universal feasibility of the novel coupled method for mineral reduction.

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Series: Bioresource technology
ISSN: 0960-8524
ISSN-E: 1873-2976
ISSN-L: 0960-8524
Volume: 294
Article number: 122217
DOI: 10.1016/j.biortech.2019.122217
Type of Publication: A1 Journal article – refereed
Field of Science: 215 Chemical engineering
Funding: Financial supports from the National Natural Science Foundation of China (No: U1802255), Innovative Research Team (in Science and Technology) in University of Yunnan Province, the Key Projects in the National Science & Technology Pillar Program during the Twelfth Five-year Plan Period (No. 2015BAB17B00), and the Hunan Provincial Science and Technology Plan Project, China (No. 2016TP1007) were sincerely acknowledged.
Copyright information: © 2019. This manuscript version is made available under the CC-BY-NC-ND 4.0 license