2008 (English)In: Proceedings for the SCANMET III-3rd International Conference on Process Development in Iron and Steel making, 2008, 377-384 p.Conference paper (Refereed)
An important part to develop in existing ladle metallurgy processes is the ladle as a reaction vessel. The ladle refractory has several vital functions and must withstand chemical, thermal and mechanical wear for longer ladle cycle times to meet higher steelmaking productivity and lower production costs. Extensive refractory wear can be caused by complex united actions such as refractory manufacturing, ladle metallurgy practice, steel and slag composition. A special exposed area is the refractory slagline.
The presented results come from one collaborative project with academic work and industrial trials to identify causes of extensive wear in the slagline. The investigation has been carried out on the slagline MgO-refractories after service. The microscopy characterisation results have then been compared to those from thermodynamic calculations by Thermo-Calc software.
It was found that the refractory microstructure at the hot-face had been totally or partly penetrated and reacted by slag. The observed phases were magnesia-alumina spinel, slag, calcium silicates and dispersed metallic iron rich phases. Closer analyses of the slag phase showed the presence of calcium silicates and calcium aluminates and some few Mg-Al spinel phases. Further away from the hot-face towards the cold-face, the microstructure was composed mainly of magnesia, small calcium silicates phases and a carbon rich phase and therefore less affected.
The project shows that it is possible to combine the characterisation results from the ostmortem studies of the refractories after service with the thermodynamic calculations so that the information about the corrosion behaviour and the microstructure changes of the refractories at refining conditions can be achieved. Further work to test new refractory materials by industrial trials combined with academic work will be performed.
Place, publisher, year, edition, pages
2008. 377-384 p.
refractory, ladle lining, microstructure, corrosion, hot-face, slagline
IdentifiersURN: urn:nbn:se:kth:diva-25167OAI: oai:DiVA.org:kth-25167DiVA: diva2:356257
MEFOS, Luleo, Sweden: 9-11 June
QC 201010122010-10-122010-10-122010-10-13Bibliographically approved