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Recycling of by-product pellets as burden in the blast furnace process: a lab and pilot scale investigation
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering.
SSAB Tunnplåt AB, Luleå, Sweden.
2004 (English)In: Steel Research International, ISSN 1611-3683, E-ISSN 1869-344X, Vol. 75, no 2, p. 99-105Article in journal (Refereed) Published
Abstract [en]

Cold bonded by-product briquettes have been recycled in the blast furnace at SSAB Tunnplat in Lulea since 1993. Recently, much effort has been made to increase the recycling of by-products. One such project deals with the development of a cold bonded by-product pellet (CBP) agglomerated from very fine dusts. The pellets used in these tests are produced from a blend containing BF flue dust, filter dust, briquette fines and BOF coarse dust as well as cement binder. The pellets were tested in the laboratory by reduction tests, softening and melting tests, thermo gravimetric analysis, differential thermo analysis, and mass spectrometry measurements. The test results indicate that the CBPs can disintegrate during reduction in the BF shaft, are self-reducing to a high extent and, as a supplement to the normal ferrous burden, they show quite good softening and melting properties. A pilot scale test in LKAB's experimental blast furnace was performed. CBPs were charged with rates of 150 kg/tHM, 299 kg/tHM and 344 kg/tHM respectively during test periods 1, 2 and 3. The blast furnace operation was very stable during test period 1 with 150 kg CBP/tHM, but the burden descent and gas distribution were disturbed during the periods with greater CBP burden content. The rate of reducing agents was significantly decreased and slag amount was increased when CBPs were charged.

Place, publisher, year, edition, pages
2004. Vol. 75, no 2, p. 99-105
National Category
Metallurgy and Metallic Materials
Research subject
Process Metallurgy
Identifiers
URN: urn:nbn:se:ltu:diva-4925DOI: 10.1002/srin.200405934ISI: 000188945500003Scopus ID: 2-s2.0-1442357556Local ID: 2ed1da10-6fff-11db-962b-000ea68e967bOAI: oai:DiVA.org:ltu-4925DiVA, id: diva2:977799
Note

Validerad; 2004; 20061109 (ysko)

Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2021-12-23Bibliographically approved

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Robinson, Ryan

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