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The Effect of Bio-Coal Agglomeration and High-Fluidity Coking Coal on Bio-Coke Quality
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Minerals and Metallurgical Engineering. Swerim AB, Box 812, Luleå, 97125, Sweden.ORCID iD: 0000-0003-4756-5554
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Minerals and Metallurgical Engineering.
Swerim AB, Box 812, Luleå, 97125, Sweden.ORCID iD: 0000-0002-7612-083x
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Minerals and Metallurgical Engineering. Swerim AB, Box 812, Luleå, 97125, Sweden.ORCID iD: 0000-0003-3363-351X
2023 (English)In: Metals, ISSN 2075-4701, Vol. 13, no 1, article id 175Article in journal (Refereed) Published
Abstract [en]

Metallurgical coke with high strength and low reactivity is used in the ironmaking blast furnace. Replacement of some coking coal with bio-coal was shown to result in lower strength and higher reactivity of produced coke due to introduction of reactive bio-coal carbon and ash components catalyzing the Boudouard reaction, but also due to lowering of the coking coal blend fluidity, which influences coke strength and reactivity negatively. The current study aims to investigate the possibility to counteract negative impact from bio-coal addition on fluidity and coke reactivity by using high-fluidity coking coal and by agglomeration of bio-coal before addition. Original bio-coal and micro-agglomerate of bio-coal was added at 10%, 15% and 20% to the coking coal blend. The influence of bio-coals on the coke reactivity was measured by using CO2 in a thermogravimetric analyzer. Selected cokes and bio-cokes were produced in technical scale, and their reactivity and strength were measured in standard tests. The effect on dilatation of adding bio-coal or crushed agglomerates of bio-coal to the coking coal blends was measured in an optical dilatometer. The results show that by using a coking coal blend containing high-fluidity coal with agglomerated bio-coal, the max. contraction is increased, whereas the opposite occurs by using original bio-coal. The results show overlapping between contraction occurring before dilatation and during dilation, which affects max. dilatation. The bio-coke containing high-fluidity coal with agglomerated bio-coal has lower reactivity in comparison to bio-cokes with original bio-coal or bio-coke with agglomerated bio-coal produced from a coking coal blend without high-fluidity coal. The reactivity of coke produced in technical scale, as measured in CRI/CSR tests, shows a similar trend regarding reactivity, as measured by thermogravimetric analysis, on coke produced in laboratory scale.

Place, publisher, year, edition, pages
MDPI , 2023. Vol. 13, no 1, article id 175
Keywords [en]
agglomerated bio-coal, bio-coke, high-fluidity coking coal, torrefied sawdust
National Category
Metallurgy and Metallic Materials
Research subject
Process Metallurgy
Identifiers
URN: urn:nbn:se:ltu:diva-95546DOI: 10.3390/met13010175ISI: 000928392500001Scopus ID: 2-s2.0-85146806548OAI: oai:DiVA.org:ltu-95546DiVA, id: diva2:1735186
Funder
Swedish Research Council Formas, (FR-2018/0010)
Note

Validerad;2023;Nivå 2;2023-02-08 (joosat);

Licens fulltext: CC BY License

Available from: 2023-02-08 Created: 2023-02-08 Last updated: 2024-03-07Bibliographically approved

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El-Tawil, AsmaaBjörkman, BoSundqvist Ökvist, Lena

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