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Density Measurements of Low Silica CaO-SiO2-Al2O3 Slags
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Materials Process Science.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering, Materials Process Science.
2010 (English)In: Metallurgical and materials transactions. B, process metallurgy and materials processing science, ISSN 1073-5615, E-ISSN 1543-1916, Vol. 41, no 4, 833-840 p.Article in journal (Refereed) Published
Abstract [en]

Density measurements of a low-silica CaO-SiO2-Al2O3 system were carried out using the Archimedes principle. A Pt 30 pct Rh bob and wire arrangement was used for this purpose. The results obtained were in good agreement with those obtained from the model developed in the current group as well as with other results reported earlier. The density for the CaO-SiO2 and the CaO-Al2O3 binary slag systems also was estimated from the ternary values. The extrapolation of density values for high-silica systems also showed good agreement with previous works. An estimation for the density value of CaO was made from the current experimental data. The density decrease at high temperatures was interpreted based on the silicate structure. As the mole percent of SiO2 was below the 33 pct required for the orthosilicate composition, discrete SiO44- 4 tetrahedral units in the silicate melt would exist along with O-2 ions. The change in melt expansivity may be attributed to the ionic expansions in the order of Al3+ - O2- < Ca2+ - O2- < Ca2+ - O- Structural changes in the ternary slag also could be correlated to a drastic change in the value of enthalpy of mixing.

Place, publisher, year, edition, pages
2010. Vol. 41, no 4, 833-840 p.
Keyword [en]
MELTS, FLUX
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:kth:diva-26943DOI: 10.1007/s11663-010-9385-1ISI: 000281985000012Scopus ID: 2-s2.0-78149466071OAI: oai:DiVA.org:kth-26943DiVA: diva2:373099
Note
QC 20101130Available from: 2010-11-30 Created: 2010-11-30 Last updated: 2017-12-12Bibliographically approved

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