The catalytic reduction behaviours between NO x and CO in sinter zone were studied as using flue gas recirculation (FGR). Minerals in sinter can act as catalysts during NO x reduction. The catalytic activity of minerals has the order of calcium ferrite > kirschsteinite > fayalite. The catalytic procedure includes two steps: iron-bearing minerals are reduced to lower valence oxides by CO, and then NO is reduced to N 2 by lower valence oxides. Improving the generation amount of calcium ferrite, especially acicular-type silico-ferrite of calcium and aluminium (SFCA), contributes to significantly reinforcing the catalytic performance between NO and CO. As the basicity of sinter increases to 2.2, it enables to generate maximum amount of acicular-type SFCA which has larger specific surface areas, therefore facilitates decreasing NO x emission during FGR sintering.

13 ternary Cu-Mg-Si alloys were prepared by means of the powder metallurgy method. Phase equilibria at 500 and 700 o C of the Cu-Mg-Si system were determined using X-ray diffraction analysis (XRD). The existence of 3 ternary compounds in this system was verified: CuMgSi_Sigma (Cu 16 Mg 6 Si 7), Tau (Cu 3 Mg 2 Si), and Laves ((Cu 0.8 Si 0.2) 2 (Mg 0.88 Cu 0.12)). A thermodynamic modeling for the Cu-Mg-Si system was then conducted on the basis of the experimental data obtained in this work and those critically reviewed from the literature. The complex phase relationship between Laves phase and other phases has been successfully modeled in this work. Comparisons between the calculated and the measured phase diagrams show that most of the experimental data can be reproduced by the presently obtained thermodynamic parameters.

The binary La-Mn system is investigated by CALPHAD approach. The experimental phase diagram and thermodynamic data available in the literature are critically reviewed and assessed using the thermodynamic models for the Gibbs energies of individual phases. A set of consistent thermodynamic data for the La-Mn system is obtained by optimization of the selected experimental data. The miscibility gap is no more existent in the optimized phase diagram. The calculated phase diagram agrees well with the experimental data

The Bi-M (M = Ti, Cr, V) systems have been critically reviewed and modeled by means of the CALPHAD technique. All the intermetallics (BiTiy BiTi,, Bi^Ti^, Bi^Ti, and BiJ'i) were treated as stoichiometric compounds. The enthalpy of"formation at 0 Kfor BiTi, was computed via first-principles calculations to assist the thermodynamic modeling. The gas phases for the Bi-Cr and Bi-V systems were treated as ideal gas. A set of self consistent thermodynamic parameters has been finally obtained for each of these binary systems. Comparisons between tiie calculated and measured phase diagrams as well as first-principles calculations show that most of experimental data can be satisfactorily reproduced by the present thermodynamic descriptions.

A bstractB y means o f CALPHAD approach, thermodynamic assessments o f the Mg-Pb and M g-Bi systems were carried out based on the available experimental data including thermodynamic properties and phase equilibrium data. The liquid phase was described with both the substitutional solution model and the associate model, and two sets o f self-consistent thermodynamic param eters fo r the Mg-Pb and M g-Bi systems were obtained, respectively. It was fo u n d that the associate m odel can account fo r the experimental data more satisfactorily than the substitutional solution one, especially fo r the liquid phase with the short-range order behavior.