Phase equilibria of Fe_(3)O_(4)-Cr_(2)O_(3)-CaO system:experimental measurements and thermodynamic calculations  

作　　者：Ao Zhu Chen-ying Shi Pei-yuan Ni Teng-fei Deng 

机构地区：[1]State Key Laboratory of Silicate Materials for Architectures,Wuhan University of Technology,Wuhan 430070,Hubei,China [2]College of Chemistry and Chemical Engineering,Central South University,Changsha 410083,Hunan,China [3]Key Laboratory of Ecological Metallurgy of Multi-Metal Intergrown Ores of Education Ministry,School of Metallurgy,Northeastern University,Shenyang 110819,Liaoning,China

出　　处：《Journal of Iron and Steel Research International》2025年第1期95-104,共10页钢铁研究学报(英文版)

基　　金：supports on the Project 52274306 from the National Natural Science Foundation of China are gratefully acknowledged.

摘　　要：Understanding the phase equilibria of the Fe_(3)O_(4)-Cr_(2)O_(3)-CaO system is essential for the efficient recycling of stainless steel pickling sludge.The isothermal section of this system at 1473 K under oxygen partial pressure of 0.15 Pa was investigated.Key experiments on the relevant binary systems were conducted using a combination of equilibrium-quenching techniques,X-ray diffraction,high-resolution transmission electron microscope,and electron probe microanalysis.These systems were rigorously assessed using the CALPHAD(CALculation of Phase Diagram)method,incorporating the present experimental data.The liquid phase was modeled using the ionic two-sublattice model,represented as(Ca^(2+),Cr^(3+),Fe^(2+))P(O_(2)^(-),Va,FeO_(1.5))Q,where Va represents vacancy,and P and Q denote the number of sites on the cation and anion sublattices,respectively.To ensure electroneutrality,the values of P and Q adjust according to the composition of the mixture.From this,the isothermal section of the Fe_(3)O_(4)-Cr_(2)O_(3)-CaO system at 1473 K under the specified oxygen partial pressure was obtained based on the thermodynamic parameters of the binary systems.The present experimental data and calculation results hold significant implications for the comprehensive recycling of stainless steel pickling sludge.

关 键 词：Fe_(3)O_(4)-Cr_(2)O_(3)-CaO system Ionic two-sublattice model Phase equilibria CALPHAD 

分 类 号：TF125.2[冶金工程—粉末冶金]