LAPSE:2020.1208
Published Article
LAPSE:2020.1208
Electrical Resistivity of Carbonaceous Bed Material at High Temperature
Gerrit Ralf Surup, Tommy Andre Pedersen, Annah Chaldien, Johan Paul Beukes, Merete Tangstad
December 17, 2020
This study reports the effect of high-temperature treatment on the electrical properties of charcoal, coal, and coke. The electrical resistivity of industrial charcoal samples used as a reducing agent in electric arc furnaces was investigated as a renewable carbon source. A set-up to measure the electrical resistivity of bulk material at heat treatment temperatures up to 1700 ∘C was developed. Results were also evaluated at room temperature by a four-point probe set-up with adjustable load. It is shown that the electrical resistivity of charcoal decreases with increasing heat treatment temperature and approaches the resistivity of fossil carbon materials at temperatures greater than 1400 ∘C. The heat treatment temperature of carbon material is the main influencing parameter, whereas the measurement temperature and residence time showed only a minor effect on electrical resistivity. Bulk density of the carbon material and load on the burden have a large impact on the electrical resistivity of each material, while the effect of particle size can be neglected at high heat treatment temperature or compacting pressure. The mechanical durability of charcoal slightly increased after heat treatment and decreased for coal and semi-coke samples. The results indicate that charcoal can be used as an efficient carbon source for electric arc furnaces.
Keywords
charcoal, Coal, coke, electrical resistivity, high-temperature treatment, pyrolysis
Subject
Suggested Citation
Surup GR, Pedersen TA, Chaldien A, Beukes JP, Tangstad M. Electrical Resistivity of Carbonaceous Bed Material at High Temperature. (2020). LAPSE:2020.1208
Author Affiliations
Surup GR: Department of Materials Science and Engineering, Norwegian University of Science and Technology, 7491 Trondheim, Norway
Pedersen TA: Department of Materials Science and Engineering, Norwegian University of Science and Technology, 7491 Trondheim, Norway
Chaldien A: Chemical Resource Beneficiation, North-West University, Potchefstroom 2520, South Africa
Beukes JP: Chemical Resource Beneficiation, North-West University, Potchefstroom 2520, South Africa
Tangstad M: Department of Materials Science and Engineering, Norwegian University of Science and Technology, 7491 Trondheim, Norway [ORCID]
Journal Name
Processes
Volume
8
Issue
8
Article Number
E933
Year
2020
Publication Date
2020-08-03
Published Version
ISSN
2227-9717
Version Comments
Original Submission
Other Meta
PII: pr8080933, Publication Type: Journal Article
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LAPSE:2020.1208
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doi:10.3390/pr8080933
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Dec 17, 2020
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CC BY 4.0
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Dec 17, 2020
 
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Dec 17, 2020
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Original Submitter
Calvin Tsay
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