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The activity of CaO and La_2O_3 in the liquid ternary slay CaO-SiO_2-La_2O_3 has been de-termined by equilibrating Sn with the slag phase in a graphite crucible under l arm of CO at1600C.The experimental results ,showed that the activity of CaO and La_2O_3 changes slowlywhile the ratio of mole fraction.x_(CaO)/x_(SiO_2),is less than unit.hut varies sharply while the ra-rio increases from 1 to 1.2.In addition,by equilibrating Sn with the binary slagB_2O_3-La_2O_3 saturated witlt solid La_2O_3 at three different temperatures,the relation betweenIgγ_(La)~0 and I/T is determined as follows:Igγ_(La)~0=-20400/T+11.37(1500-1600C)A random network model of molten silicate structure was applied to CaO-SiO_2-La2O_3.It was found that the experimentally determined activity-composition curve of CaO arequalitatively reproduced by the curves calculated with the model,but the curves of La_2O_3 areconsiderahly different from the calculated ones.It implies that the model used is over-simpli-fied and that the difference in interaction energy between the metal cations of different valenceand silicate anions should be considered.
The activity of CaO and La_2O_3 in the liquid ternary slay CaO-SiO_2-La_2O_3 has been de-termined by equilibrating Sn with the slag phase in a graphite crucible under l arm of CO at1600C. The experimental results, showed that the activity of CaO and La 2 O 3 changes slowly while the ratio of mole fractions.x_ (CaO) / x_ (SiO_2) is less than unit.hut varies sharply while the ra ri rios increases from 1 to 1.2 In addition, by equilibrating Sn with the binary slag B_2O_3-La_2O_3 saturated at a solid state of La 2 O 3 at three different temperatures, the relationship between Igγ_ (La) ~ 0 and I / T is determined as follows: Igγ_ (La) ~ 0 = -20400 / T + 11.37 (1500-1600C) A random network model of molten silicate structure was applied to CaO- SiO 2 -La 2 O 3 .It was found that the experimentally determined activity-composition curve of CaO arequallyly reproduced from the curves calculated with the model, but the curves of La 2 O 3 areconsiderahly different from the calculated ones. It implies that the model used is over-simpli-fied and th at the difference in interaction energy between the metal cations of different valence and silicate anions should be considered.