THERMODYNAMICS OF CHROMIUM OXIDES IN CAO-SIO2-CAF2 SLAG

Authors
OKABE Y TAJIMA I ITO K
Citation
Y. Okabe et al., THERMODYNAMICS OF CHROMIUM OXIDES IN CAO-SIO2-CAF2 SLAG, Metallurgical and materials transactions. B, Process metallurgy and materials processing science, 29(1), 1998, pp. 131-136
Citations number
7
Categorie Soggetti
Material Science","Metallurgy & Metallurigical Engineering
Journal title
Metallurgical and materials transactions. B, Process metallurgy and materials processing science → ACNP
ISSN journal
10735615
Volume
29
Issue
1
Year of publication
1998
Pages
131 - 136
Database
ISI
SICI code
1073-5615(1998)29:1<131:TOCOIC>2.0.ZU;2-P
Abstract
The distribution ratio of chromium between a CaO-SiO2-CaF2 slag and li quid silver under the oxygen partial pressure used in practical hot-me tal dephosphorization treatment was measured at 1623 K. The distributi on ratio was minimal when the basicity index of a slag, wt pct CaO/wt pct SiO2, was about 2. The redox equilibrium between CrO (Cr2+) and Cr O1.5 (Cr3+) in the slag was also measured as a function of slag compos ition. The calculated activity coefficient of CrO had a maximum value at wt pct CaO/wt pct SiO2 = 2, whereas that of CrO1.5 decreased monoto nously with the increase in slag basicity.