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TitleInteraction behavior of biogenic material with electric arc furnace slag
AuthorHuang, XORCID logo; Ng, K W; Giroux, L; Duchesne, M AORCID logo; Li, D; Todoschuk, T
SourceFuels vol. 2, issue 4, 2021 p. 420-436, Open Access logo Open Access
Alt SeriesNatural Resources Canada, Contribution Series 20220135
Mediapaper; digital; on-line
File formatpdf
Subjectsfossil fuels; biogenic gas; slag; carbon; Greenhouse gases; greenhouse gas emissions
Illustrationstables; photographs; plots
ProgramClean Fossil Fuels
Released2021 10 21
AbstractElectric arc furnaces (EAFs) are used for steel production, particularly when recycling scrap material. In EAFs, carbonaceous material is charged with other raw materials or injected into molten slag to generate foam on top of liquid metal to increase energy efficiency. However, the consumption of fossil carbon leads to greenhouse gas emissions (GHGs). To reduce net GHG emissions from EAF steelmaking, the substitution of fossil carbon with sustainable biogenic carbon can be applied. This study explores the possibility of the substitution of fossil material with biogenic material produced by different pyrolysis methods and from various raw materials in EAF steelmaking processes. Experimental work was performed to study the effect of biogenic material utilization on steel and slag composition using an induction melting furnace with 50 kg of steel capacity. The interaction of biogenic material derived from different raw materials and pyrolysis processes with molten synthetic slag was also investigated using a tensiometer. Relative to other biogenic materials tested, a composite produced with densified softwood had higher intensity interfacial reactions with slag, which may be attributed to the rougher surface morphology of the densified biogenic material.
Summary(Plain Language Summary, not published)
The state of the interface between slag and carbon determines the slag foaming behavior and thus the effectiveness of carbon in electric arc furnace (EAF) steelmaking. This paper explores the interaction between synthetic slag and carbonaceous materials derived from various sources, including bio-char produced by two different technologies, graphite, coke and char from tire pyrolysis. Different interfacial phenomena were found between slag and the carbonaceous materials examined. The interactions between bio-char and slag are found to be poor in comparison with other carbonaceous materials. This finding forms the basis for future research on the production of bio-char to be used as a slag foaming agent in EAF steelmaking.

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