Abstract
For clarification of the surface active effect of P 2 O 5 in the reaction kinetics and mechanism of the various metallurgical processes, the effect of P 2 O 5 addition on the reaction rate of CO 2 dissociation on the surface of the Fe t O, Fe t O-CaO (mol%Fe t O : mol%CaO=6 : 4), Fe t O-SiO 2 (mol%Fe t O : mol%SiO 2 =7 : 3), and Fe t O-CaO-SiO 2 (mol%Fe t O=35, mol%CaO/mol%SiO 2 =1.13-1.27 and 1.36-1.47) melts was investigated at 1 773 K with P C O 2 /P C O =1 by using isotope exchange technique. The rate constant decreased with increasing P 2 O 5 content of melts and the residual rate constant was observed at high P 2 O 5 content. However, the change of the Fe 3 + /Fe 2 + ratio of molten oxide was not observed. Results were analyzed by using site blockage model of P 2 O 5 , and it was concluded that the rate controlling step of CO 2 dissociation was the dissociation reaction of adsorbed CO 2 molecule on the surface of molten oxides.
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