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

Kangqiang Li, Guo Chen, Xiteng Li, Jinhui Peng, Roger Ruan, Mamdouh Omran, Jin Chen

Research output: Contribution to journalArticlepeer-review

34 Scopus citations

Abstract

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.

Original languageEnglish (US)
Article number122217
JournalBioresource Technology
Volume294
DOIs
StatePublished - Dec 2019

Bibliographical note

Funding Information:
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.

Funding Information:
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.

Keywords

  • Biomass pyrolysis
  • Dielectric properties
  • Heating characteristics
  • Low-grade pyrolusite
  • Microwave heating

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