Experimental Study of Phase Equilibria in CaO-SiO2-MgO-Al2O3-V2O3 Slags
2014 (English)In: Steel Research International, ISSN 1611-3683, Vol. 85, no 12, 1588-1596 p.Article in journal (Refereed) Published
Thermodynamic data with regard to slags containing vanadium oxide are scarce and scattered. In the present study, the classic gas-slag equilibrium technique has been adopted to investigate the phase relationships in the CaO-SiO2-MgO-Al2O3-V2O3 slags. The phase equilibria in the slag systems in the temperature range of 1773-1823K (1500-1550 degrees C) at oxygen partial pressures of 10(-5) Pa and 0.21 x 10(5) Pa were characterized. CaVO3 was precipitated in samples with basicity 1.5 and 1.8 treated in air at 1773 K (1550 degrees C) while all vanadium was dissolved in equilibrium phases in samples treated at oxygen partial pressure of 10(-5) Pa. Vanadium distribution between the slags and solid Pt and phase compositions were analyzed using scanning electron microscopy (SEM), energy dispersive spectrometer (EDS), and X-ray diffractomer (XRD) techniques. The effects of temperature, oxygen partial pressure, and slag basicity on the phase compositions in the slags are presented. Activities of VO1.5 were also calculated using the value of vanadium activity in the Pt-V alloy.
Place, publisher, year, edition, pages
2014. Vol. 85, no 12, 1588-1596 p.
vanadium oxide, phase equilibrium, activity, thermodynamics, steelmaking slags
Metallurgy and Metallic Materials
IdentifiersURN: urn:nbn:se:kth:diva-158282DOI: 10.1002/srin.201400017ISI: 000345832000002ScopusID: 2-s2.0-84913616789OAI: oai:DiVA.org:kth-158282DiVA: diva2:778092
QC 201501092015-01-092015-01-072015-01-09Bibliographically approved