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High temperature reactions between insulating bricks and iron ore slag in rotary kilns
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Material Science.
2007 (English)In: European School of Materials Science and Engineering, fourth research conference: preceedings of the fourth meeting of the European School of Materials Sciencie and Engineering / [ed] M. Anglada, Barcelona: CPDA-ETSEIB , 2007, p. 69-78Conference paper, Published paper (Refereed)
Abstract [en]

During iron ore pellet production the ore is first ground to a powder and then sintered in a kiln at ~1250ºC. The company LKAB uses a kiln that is ~ 40 m long and ~ 6.5 m in diameter, insulated with Al2O3- and SiO2- containing bricks. The bricks wear and after some time need to be replaced, which is costly and time consuming. This ongoing project aims at understanding the wear mechanisms of these bricks. The technological problem is rather complex; both oxidizing and reducing atmospheres are locally present, as are various alkali species, the thermomechanical load varies, and slag degrades the bricks. The slag consists of ~95% hematite from pellets that have disintegrated and stick to the bricks. Slag/brick compatibility tests were performed in a laboratory furnace at various temperatures, holding times and atmospheres. Slag collected from a production kiln and three commercial bricks, in powder or solid form, were used. Deliberate additions of alkali species in the form of CaO, K2CO3 and Na2CO3 were included in some of the tests. DSC, TG and in-situ mass spectrometry showed an endothermic reaction, together with mass loss and release of oxygen. Analysis and characterization by microscopy and XRD revealed microstructural changes. It is clear from these observations that the slag degrades the refractories by a combination of capillary infiltration and diffusion/chemical reaction. The depth of slag penetration is more affected by increased temperature than increased time. Moreover, the bricks with higher Al2O3 content are more resistant in the presence of alkali species.

Place, publisher, year, edition, pages
Barcelona: CPDA-ETSEIB , 2007. p. 69-78
National Category
Other Materials Engineering
Research subject
Engineering Materials
Identifiers
URN: urn:nbn:se:ltu:diva-27273Local ID: 0a959800-baf6-11dd-b223-000ea68e967bISBN: 84-96616-20-7 (print)OAI: oai:DiVA.org:ltu-27273DiVA, id: diva2:1000456
Conference
European School of Materials Science and Engineering, Research Conference : 07/06/2007 - 08/06/2007
Note
Godkänd; 2007; 20081125 (jessje)Available from: 2016-09-30 Created: 2016-09-30 Last updated: 2017-11-25Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
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