Variation of Fesup 3+/Fesup 2+ and Cusup 2+/Cu+ Equilibrium with Basicity of Oxide Melts

• Published in: Metallurgical and materials transactions. B, Process metallurgy and materials processing science Vol. 37B; no. 6; pp. 949 - 957
• Main Authors: Nakasaki, M, Hasegawa, M, Iwase, M
• Format: Journal Article
• Language: English
• Published: 01.12.2006
• ISSN: 1073-5615

Oxidation-reduction equilibrium experiments were conducted with Lisub 2 sub -CaO-Alsub 2 sub sub 3-ZnO-SiOsub 2-Bsub 2 sub sub 3 melts containing small concentrations of either copper oxide or iron oxide. The results indicated that, for oxide melts containing relatively large proportions of amphoteric oxides, i.e., Alsub 2 sub sub 3 and ZnO, the ratios {(Cusup 2+)/(Cu+)Psub Osub 2sup 1/4} and {(Fesup 3+)(Fesup 2+)Psub Osub 2sup 1/4} decreased with an increase in basicity. With further increase in basicity, however, these ratios became independent of basicity. For very basic melts, the ratios increased with an increase in basicity. These variations of {(Cusup 2+)/(Cu+)Psub Osub 2sup 1/4} and {(Fesup 3+)/(Fesup 2+)Psub Osub 2sup 1/4) can be interpreted in terms of the optical basicity of the oxide melts and are consistent with the following general expressions for the red-ox equilibria within acidic and relatively basic melts, respectively: ... [PUBLICATION ABSTRACT]