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Alternative Reducing Agents for Sustainable Blast Furnace Ironmaking
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Minerals and Metallurgical Engineering.ORCID iD: 0000-0002-2358-7719
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Minerals and Metallurgical Engineering.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Minerals and Metallurgical Engineering.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Minerals and Metallurgical Engineering.
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2017 (English)In: ESTAD 2017, 2017Conference paper, Published paper (Refereed)
Abstract [en]

Lowering of CO2 emission from the integrated steel industry as well as minimizing theneed for landfill are important challenges in the focus for the integrated steel industry. With thisaim collaborative research projects have been conducted and are on-going on the possible useof renewable reducing agents or such with high content of H2 as well as for enabling recyclingof 1in-plant fines so far not possible to use. Due to contents of undesired impurities the blastfurnace (BF) sludge has to be pre-treated in an appropriate way before carbon and iron oxidecan be valorized. In order to understand the impact of alternative reducing agents as injectedthrough the tuyeres or part of top charged agglomerates containing iron oxide, samples oftorrefied biomass, plastic and in-plant fines have been analyzed by means of thermogravimetricanalyzer coupled with a mass spectrometer (TGA-MS).The results proved that effective utilization of carbon bearing BF dust and sludge as analternate reducing agent could be realized and can be implemented into BF after adequateupgrading. Plastic materials and biomass based reductants decomposition is associated with therelease of volatiles. The main contents of these volatiles are CO, H2 and hydrocarbon which areall known for their reduction potential. Moreover, injection of such materials is expected toimprove process efficiency and sustain the gas permeability along the BF cohesive zone. Onthe other hand, top charging of these materials would improve the energy and materialefficiency in the BF due to their higher reactivity compared to conventional carbon.

Place, publisher, year, edition, pages
2017.
Keywords [en]
biomass, iron and steel making wastes, waste plastic materials, reducing agents, reduction metallurgy.
National Category
Metallurgy and Metallic Materials
Research subject
Process Metallurgy
Identifiers
URN: urn:nbn:se:ltu:diva-70064OAI: oai:DiVA.org:ltu-70064DiVA, id: diva2:1230701
Conference
3rd European Steel Technology and Application Days, Vienna, Austria, 26-29 June 2017
Available from: 2018-07-04 Created: 2018-07-04 Last updated: 2018-08-14Bibliographically approved

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Ahmed, HeshamAndersson, AntonEl-Tawil, AsmaaLotfian, SamiraSundqvist Ökvist, LenaBjörkman, Bo

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Ahmed, HeshamAndersson, AntonEl-Tawil, AsmaaLotfian, SamiraSundqvist Ökvist, LenaBjörkman, Bo
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Metallurgy and Metallic Materials

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