High-temperature mass spectrometric study of the vaporization process in the system CaO-MgO-Al2O3-Cr2O3-FeO-SiO2
2009 (English)In: Rapid Communications in Mass Spectrometry, ISSN 0951-4198, E-ISSN 1097-0231, Vol. 23, 2233-2239 p.Article in journal (Refereed) Published
Knudsen effusion mass spectrometry was used to study vaporization processes and thermodynamic properties of twenty samples of chromium-containing slags in the CaO-MgO-Al2O3-Cr2O3-FeO-SiO 2 system in the temperature range 1850-2750 K. Tungsten cells were used and Cr2O3 solid was used as a reference material. The system was calibrated using liquid gold. As FeO was the first emanating vapor species, monitoring of the chromium-containing species could be carried out only after the complete vaporization of FeO. This, however, was found to have very little impact on the concentration of the slags investigated. During the measurements, the ion current intensities of CrO+ and CrO +2 species in the mass spectra of the vapor over the CaO-MgO-Al2O3-Cr2O3-FeO-SiO 2 samples were monitored and compared with those corresponding to solid Cr2O3. Data on the partial pressures of vapor species as well as the activities of Cr2O3 as a function of temperature were obtained. The results are expected to be valuable in the optimization of slag composition in high alloy steelmaking processes.
Place, publisher, year, edition, pages
2009. Vol. 23, 2233-2239 p.
THERMODYNAMIC PROPERTIES; OXIDE MELTS; LIQUID; MIXTURES; CHROMIUM; CR2O3; FEO
Metallurgy and Metallic Materials
IdentifiersURN: urn:nbn:se:kth:diva-11230DOI: 10.1002/rcm.4127ISI: 000268003400015ScopusID: 2-s2.0-67650366930OAI: oai:DiVA.org:kth-11230DiVA: diva2:242347
QC 20108132009-10-082009-10-072012-01-18Bibliographically approved