CaO-SiO_2-FeO-P_2O_5渣系中各组元的活度计算

Activity calculation of the components in the CaO-SiO_2-FeO-P_2O_5 slag

根据熔渣分子和离子共存理论,建立了CaO-SiO2-FeO-P2O5渣系的活度计算模型.利用该模型对渣中各组元的活度进行了计算,并分析了w(FeO)和w(CaO)/w(SiO2)对渣中组元活度的影响.结果表明,在1 300℃下,CaO-SiO2-FeO-P2O5渣系中活度较高的组元是FeO、CaO·SiO2、2CaO·SiO2和3FeO·P2O5.当w(FeO)小于15%时,随着w(FeO)的增加,渣中2CaO·SiO2和3FeO·P2O5的活度不断升高,3CaO·P2O5活度降低.当w(FeO)大于15%时,随着w(FeO)的增加,渣中2CaO·SiO2和3FeO·P2O5的活度逐渐降低,而FeO的活度则不断升高.当w(CaO)/w(SiO2)小于1.5时,2CaO·SiO2的活度随碱度的增大而升高,3FeO·P2O5的活度变化不大.当w(CaO)/w(SiO2)大于1.5时,随炉渣碱度的增大,2CaO·SiO2和3FeO·P2O5的活度降低,而3CaO·P2O5的活度升高.

Calculation model of activity for the components of in the CaO-SiO2-FeO-P2O5 slag was established according to the coexistence theory of molecule and ion.The activity of the components in the CaO-SiO2-FeO P2O5 slag was calculated,and the influences of w(FeO) and w(CaO) /w(SiO2) on the activity of the components was discussed.The research results showed that the components with higher activity at 1300℃ are FeO,CaO·SiO2,2CaO·SiO2 and 3FeO·P2O5.When w(FeO) is less than 15%,with increasing w(FeO),activity of 2CaO·SiO2 and 3FeO·P2O5 in the slag increases,while activity of 3CaO·P2O5 decreases.When w(FeO) is more than 15%,with increasing w(FeO),activity of 2CaO·SiO2 and 3FeO·P2O5 in the slag decreases,but activity of w(FeO) increases.When w(CaO) /w(SiO2) is less than 1.5,activity of 2CaO ·SiO2 increases with increasing w(CaO) /w(SiO2),however the activity of 3FeO·P2O5 was non-change.When the w(CaO) /w(SiO2) was more than 1.5,activity of 2CaO·SiO2 and 3FeO·P2O5 decreases with increasing w(CaO) /w(SiO2),besides