PROPERTIES OF STEELMAKING DUSTS FROM DRY DUST SEPARATORS

1 LANZERSTORFER Christof
Institution:
1 University of Applied Sciences Upper Austria, Wels, Austria, EU, c.lanzerstorfer@fh-wels.at
Conference:
27th International Conference on Metallurgy and Materials, Hotel Voronez I, Brno, Czech Republic, EU, May 23rd - 25th 2018
Proceedings:
Proceedings 27th International Conference on Metallurgy and Materials
Pages:
41-48
ISBN:
978-80-87294-84-0
ISSN:
2694-9296
Published:
24th October 2018
Proceedings of the conference were published in Web of Science and Scopus.
Metrics:
100 views / 122 downloads
Abstract

During the production of plain carbon steel from hot metal and/or scrap considerable amounts of dust-laden off-gases are produced. In de-dusting of these off-gases considerable amounts of fine grained residues are produced, which have to be stored, transported and handled. Thereby, the flow-related properties of the dusts are of great importance. In this study the mechanical properties of dusts from dry off-gas de-dusting in steelmaking plants were investigated. The mass median diameters of electric arc furnace (EAF) dust, basic oxygen furnace (BOF) primary de-dusting dust and vacuum degassing dust (VD) were in the range of a few micrometer, while it was up to more than 100 µm for the residues from the pre-separators in EAF and BOF de-dusting. The values for the particle density were quite similar for all dusts (approximately 3,800-4,800 kg/m³), but the bulk density of the dusts varied in a wide range (approximately 190-1,900 kg/m³). With respect to the flow relevant parameters - flowability, angle of internal friction, wall friction angle and angle of repose – the investigated dusts can be split into two groups: the coarse residues from the pre-separators, which are characterized by low values for the angles and a good flowability, and all other dusts with higher values for the angles and a flowability in the range of very cohesive to cohesive.

Keywords: Steelmaking dust, BOF dust, EAF dust, dust flowability, dust properties

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