MgO-P2O5和CaO-P2O5体系的热力学优化

doi:10.3866/PKU.WHXB201508121

Abstract

Abstract:

The MgO-P₂O₅ and CaO-P₂O₅ systems have been thermodynamically assessed based on the available phase diagram and thermodynamic data using the Calculation of Phase Diagram (CALPHAD) method. The liquid phase is described by the modified quasichemical model with the pair approximation, which takes short-range ordering in liquid solution into account. The PO₄^3- is considered as the basic building unit of P₂O₅ in the liquid solution since the maximum short-range ordering occurs at the M₃(PO₄)₂ (M = Mg, Ca) composition. All intermetallic phases are treated as stoichiometric compounds and the phase transformations are considered. A set of self-consistent model parameters is obtained to describe the thermodynamic property of every phase in these two binary systems, by which the published phase diagram, enthalpy, entropy, and activity data are reproduced well within experimental error limits. The present study can be used as a basis for the development of a thermodynamic database of molten slag system for the steelmaking dephosphorus process.

Key words: MgO-P₂O₅, CaO-P₂O₅, Modified quasichemical model, Thermodynamics, Phase diagram

Guo-Hui. DING,Wei XIE,In-Ho JUNG,Zhi-Yu QIAO,Guang-Wei DU,Zhan-Min CAO. Thermodynamic Assessment of the MgO-P₂O₅ and CaO-P₂O₅ Systems[J]. Acta Phys. -Chim. Sin. 2015, 31(10), 1853-1863. doi: 10.3866/PKU.WHXB201508121

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Thermodynamic Assessment of the MgO-P₂O₅ and CaO-P₂O₅ Systems

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