Critical Evaluation and Thermodynamic Modeling of the MgO–MnO–Mn₂O₃–SiO₂ System

Abstract

A complete literature review, critical evaluation, and thermodynamic optimization of phase diagrams and thermodynamic properties of the MgO-MnO-Mn 2 O 3 -SiO 2 system at 1 atm pressure are presented. The molten oxide phase was described by the Modified Quasichemical Model considering the shortrange ordering in molten oxide, and the Gibbs energies of solid solutions were described using the Compound Energy Formalism considering the crystal structure of each solid solution. A set of optimized model parameters of all phases was obtained which reproduces all available and reliable thermodynamic data and phase diagrams within experimental error limits from 25°C to above the liquidus temperatures over the entire range of composition under the oxygen partial pressures from metallic saturation to 1 atm. The database of the model parameters can be used along with software for the Gibbs energy minimization to calculate any phase diagram section and thermodynamic property within the present system.ðA À AÞ þ ðB À BÞ ¼ 2ðA À BÞ Dg ABwhere A and B are Mg 2+ , Mn 2+ , Mn 3+ and Si 4+ in the present slag, and (A-B) represents a second-nearest-neighbor W. G. Fahrenholt-contributing editor Manuscript No. 36445.

Numerical Treatment of Oxide Particle Dissolution in Multicomponent Slags with Local Gibbs Energy Minimization

“…These thermochemical calculations are performed using a newly developed Gibbs energy minimization algorithm in combination with an in-house thermochemical database built on the modified quasi-chemical model for the description of the liquid phase. [31][32][33][34][35][36][37][38][39][40][41][42][43] For a deeper discussion on the Gibbs energy minimization method, see, for example, refs. [29,30,[44][45][46][47][48][49].…”

Separation of PGMs Bearing Alumina Phase from Cordierite in Spent Automobile Catalyst by Thermal Shock

“…The compressive stress at the region A, the thinnest part of coat layer, is higher than other areas. In order to clarify the stress change in the coat layer and to check the effect of heating temperature on 6 1200 1000 Apparent thermal expansion coeff., (10 −6 ·K −1 ) 18 8.1 1.3 Apparent Poisson's ratio, (-) 19,20 0.25 0.31 Apparent Young modulus, E (GPa) 17,19 139 40 the stress, we chose a line of surface area of the coat layer (shown in Fig. 4 (a)) and showed the stress distribution along this line in Fig.…”

Thermodynamic Modeling of the HfO2–La2O3–Al2O3 System

“…The HfO 2 –Al 2 O 3 system was assessed by Lysenko and Fabrichnaya et al . with two‐sublattice ionic liquid model, but it is incompatible with the modified quasichemical model (MQM) used in this work, which has been successfully applied to the description of many liquid oxide solutions . Therefore, the La 2 O 3 –Al 2 O 3 and HfO 2 –Al 2 O 3 systems will be reassessed considering the phase equilibria of ternary system and consistent liquid model.…”