Effect of P_2O_5 Addition on the Rate of CO_2 Dissociation on the Surface of Fe_tO-base Molten Oxides

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For clarification of the surface active effect of P<sub>2</sub>O<sub>5</sub> in the reaction kinetics and mechanism of the various metallurgical processes, the effect of P<sub>2</sub>O<sub>5</sub> addition on the reaction rate of CO<sub>2</sub> dissociation on the surface of the Fe<sub>t</sub>O, Fe<sub>t</sub>O-CaO (mol%Fe<sub>t</sub>O : mol%CaO=6 : 4), Fe<sub>t</sub>O-SiO<sub>2</sub> (mol%Fe<sub>t</sub>O : mol%SiO<sub>2</sub>=7 : 3), and Fe<sub>t</sub>O-CaO-SiO<sub>2</sub> (mol%Fe<sub>t</sub>O=35, mol%CaO/mol%SiO<sub>2</sub>=1.13-1.27 and 1.36-1.47) melts was investigated at 1773 K with <i>P</i><sub>CO<sub>2</sub></sub>/<i>P</i><sub>CO</sub>=1 by using isotope exchange technique. The rate constant decreased with increasing P<sub>2</sub>O<sub>5</sub> content of melts and the residual rate constant was observed at high P<sub>2</sub>O<sub>5</sub> content. However, the change of the Fe<sup>3+</sup>/Fe<sup>2+</sup> ratio of molten oxide was not observed. Results were analyzed by using “site blockage model” of P<sub>2</sub>O<sub>5</sub>, and it was concluded that the rate controlling step of CO<sub>2</sub> dissociation was the dissociation reaction of adsorbed CO<sub>2</sub> molecule on the surface of molten oxides.

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  • ISIJ international

    ISIJ international 44(9), 1494-1500, 2004-09-15

    一般社団法人 日本鉄鋼協会

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