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Characteristics of metal droplets in slag tapped from the blast furnace
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Process Metallurgy.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Applied Process Metallurgy.
2006 (English)In: Steel Research International, ISSN 1611-3683, E-ISSN 1869-344X, Vol. 77, no 1, 5-13 p.Article in journal (Refereed) Published
Abstract [en]

Slag samples, hot-metal samples and hot-metal temperatures were obtained during tapping of two blast furnaces. Sampling was carried out at different time points during tapping of three separate heats. The size distribution and composition of metal droplets found in the slag were determined using scanning electron microscopy. Only metal droplets above 0.75 mu m could be counted and analysed. All droplets were below 8 mu m in diameter and the great majority of these droplets were found to be between 0.75 and 2 Pm. The size distribution did not differ significantly for different slag samples. Iron was the main droplet component. Electron probe microanalysis showed that the droplets contained small amounts of carbon. The percentage of the area in a studied cross-section that was covered with metal droplets varied between 0.01 and 0.07%. Calculations based on Stoke's law showed that the distance droplets travel in the slag is in the micron range. Slag samples taken in the beginning of slag tapping contained more droplets than those taken in the middle of slag tapping, an indication that most droplets can be found in the area near the furnace wall. Some droplets were determined to have magnesium enrichment at the external surface.

Place, publisher, year, edition, pages
2006. Vol. 77, no 1, 5-13 p.
Keyword [en]
blast furnace practice, pig iron, droplets, slag, particle size distribution
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:kth:diva-37597ISI: 000235604600002Scopus ID: 2-s2.0-32544453846OAI: oai:DiVA.org:kth-37597DiVA: diva2:434417
Available from: 2011-08-15 Created: 2011-08-15 Last updated: 2017-12-08Bibliographically approved

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CiteExportLink to record
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