固体鉄と平衡する Fe_tO-P_2O_5-CaO 系及び Fe_tO-P_2O_5-MgO 系スラグの熱力学

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As a fundamental study on the physico-chemical properties of phosphate slags, a measurement has been made on the equilibrium of hydrogen-water vapor gas mixtures with the phosphate slags of Fe_tO-P_2O_5-CaO and Fe_tO-P_2O_5-MgO ternary systems contained in solid iron crucible at 1400℃. From the results obtained, the activity of iron oxide and the ratio of ferrous to ferric iron (A=Fe^<3+>/Fe^<2+>) have been determined as a function of slag composition. The activity of iron oxide in these slags markedly deviated to the direction of the composition of 3CaO・P_2O_5 and 3MgO・P_2O_5 compound respectively. In view of ionic theory, the approximate validity of regular solution model for cations were examined to evaluate the thermodynamic properties of these ternary slag containing P_2O_5. It was confirmed that the regular solution model was satisfied within experimental error except for extremely FeO rich region. The values of interaction energy concerning P_2O_5 are as follows, α_<34>(P^<5+>∿Ca^<2+>)=-50900±400cal/mol α_<35>(P^<5+>∿Mg^<2+>)=-32200±700cal/mol
社団法人日本鉄鋼協会の論文
1982-02-01