Reduction of Molten Iron Oxide in CO Gas Conveyed System

Effect of P2O5 Addition on the Rate of CO2 Dissociation on the Surface of FetO-base Molten Oxides

“…Step of CO 2 Dissociation Strong blocking effect of P 2 O 5 on CO 2 dissociation was observed as shown in Figs. 6 and 7.…”

“…Therefore, the kinetic data of CO-CO 2 reaction are important for the analysis, simulation and the development of refining processes. Especially in the ironmaking and steelmaking processes, for development of the bath smelting process as an innovative process, this reaction rate has been widely investigated by many researchers [1][2][3][4][5][6][7][8][9][10][11][12][13] and the reduction rate of molten oxides containing iron oxide is expressed as the function of temperature and the Fe 3ϩ /Fe 2ϩ ratio of the molten oxides. However, this relationship cannot be applied when the strong surface active elements such as P 2 O 5 or Na 2 O are contained in molten oxides.…”

Surface Active Effect of Na2O on the Rate of CO2 Dissociation on the Surface of Molten FeOx-Na2O and FeOx-SiO2-Na2O Systems

“…Figure 1 shows an example of ion current profiles for each gas species measured by QMS. From these average ion currents of each species, (P13 CO 2 /P12 CO 2 ) i and (P13 CO 2 / P12 CO 2 ) o were calculated for the following calculation of reaction rate constant.…”

“…Therefore, oxidation or reduction rates for FeO x -contained molten oxides have been widely investigated. [1][2][3][4][5][6][7][8][9][10][11][12][13] Researches about the reduction rate of FeO x and FeO x -based molten oxides with CO-CO 2 gas have been conducted by many researchers. Tsukihashi et al 2) measured the reduction rate of molten iron oxide in CO gas conveyed system at 1 723 and 1 873 K. Fine powders of iron oxide were utilized to eliminate the effect of gas phase mass transfer rate on the overall reaction rate of reduction.…”

“…[1][2][3][4][5][6][7][8][9][10][11][12][13] Researches about the reduction rate of FeO x and FeO x -based molten oxides with CO-CO 2 gas have been conducted by many researchers. Tsukihashi et al 2) measured the reduction rate of molten iron oxide in CO gas conveyed system at 1 723 and 1 873 K. Fine powders of iron oxide were utilized to eliminate the effect of gas phase mass transfer rate on the overall reaction rate of reduction. Nagasaka et al 6) also measured the reduction rate of molten iron oxide contained in an iron crucible under strong CO gas flow by using thermobalance in the temperature range of 1 673 to 1 723 K. Measured reduction rate constants were quite in good agreement with those measured by Tsukihashi et al Meanwhile, the dissociation rates of CO 2 on the surface of molten oxides containing iron oxide have been measured by Sasaki et al, 3) ElRahaiby et al, 7) Sun et al 8) and Mori et al 11) with isotope exchange technique.…”