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- W2607463984 abstract "The effects of roasting temperature, CO concentration and Pco2/Pco ratio of the roasting gas mixtures on the decomposition rate of, zinc ferrite and the extractability of zinc in reduced products with 0.1N H2SO4 solution were investigated. Decomposition of zinc ferrite are considerablly easy even with reducing gas mixtures of low CO concentration. The reducing decomposition reaction of zinc ferrite proceeds as folows;3ZnFe2O4+CO=3ZnO+CO2 (1)or (2+x) ZnFe2O4+xCC=3xZnO+2Zn1-xFe+xO4+xCO2 (1a)Fe3O4+CO=3FeO+CO2 (2)The effect of roasting temperature on the rate of the reaction (1) is very small (the apparent energy of activation is 1.7 kcal/mol), but finally attained fraction of the decomposition is dependent on roasting, temperature.The rate of the reaction (1) is neady proportional to Pco, when Pco2/Pco ratio of the reducing gas: is 1.3.Value of Pco2/Pco ratio has an effect on the finally attained fraction of the decomposition, i.e. the smaller the value, the larger the ratio becomes.On the way of the reaction (1), FeO was formed in spite of no potential for reducing gases to reduce. Fe3O4 to FeO, and an unknown phase (probably tetragonal crystal) was appeared at, the same time. The. unknown material is considered as the origin of FeO phase, that is, ZnO and FeO may separate from Zn1-x. Fe2+xO4 in a form of the unknown material, thereafter perhaps the material decomposes into ZnO and FeO.Zinc is easily extracted at high percentages by 0.1N H2SO4 solution from the reduced products of zinc ferrite. Leach solutions contain more Fe2+ ion than the expected value from the stoichiometric Fe2+/Fe+-ratio of Fe3O4. The above-mentioned FeO formation was presumed from this fact." @default.
- W2607463984 created "2017-04-28" @default.
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- W2607463984 date "1964-01-01" @default.
- W2607463984 modified "2023-09-27" @default.
- W2607463984 title "The Reduction Roasting of Zink-ferrite ZnFe<SUB>2</SUB>O<SUB>4</SUB> with Weakly Reducing Gas CO-CO<SUB>2</SUB>-N<SUB>2</SUB> Mixtures" @default.
- W2607463984 doi "https://doi.org/10.2473/shigentosozai1953.80.918_1059" @default.
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