CaO含量对CaF2-Al2O3-CaO-Ce2O3渣系中Ce2O3行为的影响  

Influence of CaO content in slag CaF2-Al2O3-CaO-Ce2O3 on the behavior of Ce2O3

作　　者：王振虎 李少英 郭汉杰[1,2] 郭靖 WANG Zhenhu;LI Shaoying;GUO Hanjie;GUO Jing(School of Metallurgical and Ecological Engineering,University of Science and Technology Beijing,Beijing 100083,China;Beijing Key Laboratory of Special Melting and Preparation of High-End Metal Materials,Beijing 100083,China)

机构地区：[1]北京科技大学冶金与生态工程学院,北京100083 [2]高端金属材料特种熔炼与制备北京市重点实验室,北京100083

出　　处：《有色金属科学与工程》2019年第3期6-13,共8页Nonferrous Metals Science and Engineering

基　　金：国家自然科学基金资助项目(U1560203,51274031)

摘　　要：在Fe-Cr-Al合金中添加微量的稀土元素可显著改善合金的使用性能,文中以电渣重熔生产Fe-Cr-Al合金所用稀土渣为研究对象,根据离子-分子共存理论(IMCT)建立了1823K时CaF2-Al2O3-CaO-Ce2O3四元渣系热力学质量作用浓度模型.结果表明:当渣系中CaO和Al2O3的质量百分数之比维持在1∶1,即wCaO/wAl2O3=1时,随着Ce2O3含量增加,渣中铈铝酸盐Ce2O3·Al2O3质量作用浓度(活度)显著增加,但炉渣物相种类没有变化.渣系中Ce2O3含量分别在10%,20%,30%,40%时,wCaO/wAl2O3值对组元活度的影响各不相同但有共同特征,表现在处于约1.0~1.8时,CaO活度增加最迅速,Ce2O3活度增加,Ce2O3·Al2O3活度下降,说明渣中CaO含量增加促进了Ce2O3·Al2O3分解而导致Ce2O3活度增加,选取渣系进行熔融和X射线衍射实验,用jade5.0软件分析物相,实验结果与计算一致.The performance of Fe-Cr-Al alloy can be improved significantly when it contains a small amount of rare earth.In this paper,after studying the slags used for producing Fe-Cr-Al alloy with the method of ESR,we then establish the thermodynamic model of mass action concentration of CaF2-Al2O3-CaO-Ce2O3 at 1873 K based on ion and molecule coexistence theory(IMCT).The result demonstrates that the value of Ce2O3·Al2O3 activity increases when keeping and increasing Ce2O3 content in slags,but the phase composition in slags does not change;when the concentration of Ce2O3 is 10%,20%,30%,40%respectively,the value of differs and poses different impacts on the activity of compositions,but when the value is between 1.0 and 1.8,the activity of CaO increases fastest and that of Ce2O3·Al2O3 decreases,which demonstrates the decomposition role of CaO in slags is remarkable.We select slags to conduct melting and XRD experiment on the samples and then use jade5.0 software to analyze the result,which proves to be consistent with the theory.

关 键 词：共存理论 作用浓度 衍射 稀土 

分 类 号：TF141[冶金工程—冶金物理化学]