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Lime Dissolution in Foaming BOF Slag
KTH, School of Industrial Engineering and Management (ITM), Centres, Centre of Excellence for Science and Innovation Studies, CESIS.ORCID iD: 0000-0002-9311-3914
KTH, School of Industrial Engineering and Management (ITM), Production Engineering.ORCID iD: 0000-0002-6127-5812
KTH, School of Industrial Engineering and Management (ITM), Production Engineering.ORCID iD: 0000-0002-3548-8638
2018 (English)In: Metallurgical and materials transactions. B, process metallurgy and materials processing science, ISSN 1073-5615, E-ISSN 1543-1916, Vol. 49, no 6, p. 3164-3170Article in journal (Refereed) Published
Abstract [en]

The paper describes the dissolution mechanisms of lime into liquid and foaming slags relevant to the BOF process. Two different master slags are employed, representing two different periods of the converter process: an early stage where the FeO content is fixed to 45 wt pct, and a later stage where the FeO content is fixed to 25 wt pct. For these master slags, the ratio between CaO/SiO2 is varied to examine the effect of basicity on lime dissolution. Calcium silicates are formed and peeled off, or partially peeled off, from the interface between the lime cube and the slag in all cases. The main difference for the dissolutions in pure liquid slag and foaming slag is the controlling step for dissolution. In liquid slag, the controlling mechanism is the removal of the calcium silicate layers, while in foaming slag, the controlling mechanism is the contact area between the lime and the liquid slag phase of the foam. The strong convection in the foam enhance the dissolution process, in some cases, the lime even dissociates into small pieces.

Place, publisher, year, edition, pages
Springer Boston , 2018. Vol. 49, no 6, p. 3164-3170
Keywords [en]
Calcium silicate, Dissolution, Iron oxides, Lime, Liquids, Silicates, Contact areas, Controlling mechanism, Controlling steps, Converter process, Dissolution mechanism, Dissolution process, Foaming slags, Strong convections, Slags
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:kth:diva-247022DOI: 10.1007/s11663-018-1421-6ISI: 000451647900022Scopus ID: 2-s2.0-85055355767OAI: oai:DiVA.org:kth-247022DiVA, id: diva2:1330790
Note

QC 20190626

Available from: 2019-06-26 Created: 2019-06-26 Last updated: 2019-06-26Bibliographically approved

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Martinsson, GustavGlaser, BjoernSichen, Du

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