Variation of Fe3+/Fe2+ and Cu2+/Cu+ equilibrium with basicity of oxide melts

被引:0
作者
M. Nakasaki
M. Hasegawa
M. Iwase
机构
[1] Kyoto University,the Ferrous Metallurgy Research Group, Department of Energy Science and Technology
来源
Metallurgical and Materials Transactions B | 2006年 / 37卷
关键词
Material Transaction; Boron Oxide; Optical Basicity; Amphoteric Oxide; Anticipate Variation;
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摘要
Oxidation-reduction equilibrium experiments were conducted with Li2O-CaO-Al2O3-ZnO-SiO2-B2O3 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., Al2O3 and ZnO, the ratios lcub;(Cu2+)/(Cu+)PO21/4rcub; and lcub;(Fe3+)/(Fe2+)PO21/4rcub; 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 lcub;(Cu2+)/(Cu+)PO21/4rcub; and lcub;(Fe3+)/(Fe2+)PO21/4rcub; 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: Mn++(1/4)O2=M(n+1)++(1/2)O2− Mn++(1/4)O2+(3/2)O2−=MO2(3−n) and Mn++(1/4)O2=(3/4)M(n+1)++(1/4)MO2(3−n)
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页码:949 / 957
页数:8
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