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Some Thermodynamic Aspects of the Oxides of Chromium
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.
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2014 (English)In: Metallurgical and materials transactions. B, process metallurgy and materials processing science, ISSN 1073-5615, E-ISSN 1543-1916, Vol. 45, no 2, 338-344 p.Article in journal (Refereed) Published
Abstract [en]

To understand Cr emissions from slag melts to a vapor phase, an assessment of the stabilities of the chromium oxides at high temperatures has been carried out. The objective of the present study is to present a set of consistent data corresponding to the thermodynamic properties of the oxides of chromium, with special reference to the emission of hexavalent chromium from slags. In the current work, critical analysis of the experimental data available and a third analysis in the case of Cr2O3 have been carried out. Commercial databases, Fact Sage and ThermoCalc along with NIST-JANAF Thermochemical Tables, have been used for the analysis and comparisons of the results that are presented. The significant discrepancies in the available data have been pointed out. The data from NIST-JANAF Thermochemical Tables have been found to provide a set of consistent data for the various chromium oxides. An Ellingham diagram and the equations for the Delta G degrees (standard Gibbs free energy change) of formation of CrOx have been proposed. The present analysis shows that CrO3(g) is likely to be emitted from slag melts at high oxygen partial pressures.

Place, publisher, year, edition, pages
2014. Vol. 45, no 2, 338-344 p.
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Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:kth:diva-147965DOI: 10.1007/s11663-014-0027-xISI: 000336980600003Scopus ID: 2-s2.0-84899457337OAI: oai:DiVA.org:kth-147965DiVA: diva2:733627
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QC 20140710

Available from: 2014-07-10 Created: 2014-07-10 Last updated: 2017-12-05Bibliographically approved

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