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Retainment, Recovery and Recycling: A Swedish Success Story of ECO-Steelmaking
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Materials Process Science.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Materials Process Science.
2013 (English)In: Transactions of the Indian Institute of Metals, ISSN 0972-2815, Vol. 66, no 5-6, 567-575 p.Article in journal (Refereed) Published
Abstract [en]

With a view to optimize the environmental aspects of steelmaking, the Swedish Steel Producers Association took the initiative to start a national project on ECO-steelmaking with financial support from Swedish Foundation for Strategic Environmental Research. The Division of Materials Process Science at the Royal Institute of Technology has an important part of the project, viz. "Retention, Recovery and Recycling", with emphasis on the retention of metal values in the steel bath without loss to the slag or gas phases, to recover the metal values that are lost to the slag phase by the development of new or optimized process concepts and aim at a total recycling of the metal values as well as the slag components within or outside the steel sector. The present paper describes the optimization of existing process concepts as well as evolving newer concepts to meet the above project goals. The use of CO2-O-2-Ar gas mixtures for the decarburization of high-alloyed steels, development of a low cost precursor for the addition of molybdenum to steel in EAF, direct alloying in EAF are some of the concepts initiated in the present work. Successful recovery of iron and manganese values by oxidation of the slag and separation of the magnetite or manganese ferrate by electromagnetic separation formed part of the recovery part. As part of the project, a salt extraction process was developed by which the metal values in slags could be extracted into a chloride phase followed by electrolysis in fused chloride medium. This method was found to be successful in the recovery of metal values from slags. This process could be extended to the recovery of a variety of metal values from a variety of secondary sources. The salient features of the process designs and the results are presented in this paper.

Place, publisher, year, edition, pages
2013. Vol. 66, no 5-6, 567-575 p.
Keyword [en]
Retention, Recovery, Recycling, Eco-steel production, CO2-decarburization, Molybdenum addition, Oxidation, Salt extraction process
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:kth:diva-133513DOI: 10.1007/s12666-013-0289-zISI: 000324334300016Scopus ID: 2-s2.0-84884818443OAI: oai:DiVA.org:kth-133513DiVA: diva2:662264
Funder
Mistra - The Swedish Foundation for Strategic Environmental Research, 88032 88034
Note

QC 20131106

Available from: 2013-11-06 Created: 2013-11-06 Last updated: 2013-11-06Bibliographically approved

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  • apa
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