CaO-BaO-CaF_2-SiO_2 系および CaO-Al_2O_3 系フラックス中りんの熱力学

概要

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The effect of BaO addition to the CaO-CaF_2-SiO_2 melts on the phosphorus partition ratio between CaO-CaF_2-SiO_2 melts doubly saturated with CaO and 3CaO・SiO_2 and Fe-C_<satd.> melts was investigated at 1300℃ by using a chemical equilibration technique. The partition ratio increases with increasing the BaO content. The addition of 26%BaO enhances the partition ratio six times. The phosphorus partition ratio between CaO-Al_2O_3 fluxes and Fe-C_<satd.> melts was measured at 1500℃. The phosphorus partition increases with increasing CaO content and its phosphate capacity ranges from 10^<19> to 10^<21>. The activity coefficient of PO_<2.5> was also calculated. Furthermore, in order to calculate the above mentioned phosphate capacities, the activity coefficient of phosphorus in carbon saturated iron, f_P, at hot metal temperature was determined by measuring the partition of phosphorus between CaO-CaF_2-SiO_2 fluxes and Fe-C_<satd.> melts and that between the same fluxes and silver at different oxygen partial pressures. The activity coefficient of phosphorus in carbon saturated iron is expressed as follows : logƒ_P=-386/T+0.891 The relationship between phosphate capacity and sulfide capacity is also discussed for various fluxes.
1990-10-01