RECYCLING OF EAF DUST VIA BRIQUETTING: INFLUENCE OF ORGANIC MATTER ON BRIQUETTE STRENGTH

1 LANZERSTORFER Christof
Co-authors:
1 PASCHINGER Michael 2 BRUNNER Christian
Institutions:
1 University of Applied Sciences Upper Austria, Wels, Austria, EU, c.lanzerstorfer@fh-wels.at
2 Primetals Technologies Austria GmbH, Linz, Austria, EU, christian.a.brunner@primetals.com
Conference:
34th International Conference on Metallurgy and Materials, Orea Congress Hotel Brno, Czech Republic, EU, May 21 - 23, 2025
Proceedings:
Proceedings 34th International Conference on Metallurgy and Materials
ISBN:
978-80-88365-27-3
ISSN:
2694-9296
Licence:
CC BY 4.0
Metrics:
3 views / 3 downloads
Abstract

In EAF steelmaking considerable amounts of dust are generated. Depending on the furnace type and the content of organic material in the scrap EAF dust contains beside iron oxides, slag components and zinc also some organic matter (TC). Recycling of this iron-rich residue is common via briquetting of the EAF dust together with other fine granular steel mill residues and a binder. It is assumed that a higher TC content in EAF is unfavourable for the strength of the briquettes. In this study, EAF dust was refluxed with an organic solvent (n-heptane) in order to reduce the TC content of the EAF dust by approximately 50%. Subsequently, both the solvent-leached EAF dust and the untreated original EAF dust were used in mixtures in the production of briquettes in a stamp press. Bentonite, modified starch and a mixture of molasses and hydrated lime were used as binders. The strength of the agglomerates was tested immediately after pressing, one hour and twenty-four hours after pressing. The results showed in most cases a higher strength of the briquettes containing leached EAF dust.

Keywords: Steel mill, EAF dust, recycling, briquette strength, organic matter

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