CAJ | 학술논문

采用热重分析、X射线衍射、扫描电镜和光学显微镜等技术对攀枝花预氧化钛精矿的H2还原行为进行研究，包括H 2还原反应的动力学、还原产物的物相转变及显微结构的变化规律。结果表明：预氧化钛精矿在1100℃还原80 min后还原度达到96.04%；在温度为1000~1150℃范围内，还原过程受界面化学反应控制，表观活化能为95.25 kJ/mol。在还原过程中将会形成M 3 O 5型(M=Ti, Fe, Mg等)固溶体，导致还原难度加大。显微结构表明，还原反应由颗粒边缘向内部进行，而Mg元素在未反应内核的富集阻碍了预氧化钛精矿的进一步还原。
채용열중분석、X사선연사、소묘전경화광학현미경등기술대반지화예양화태정광적H2환원행위진행연구，포괄H 2환원반응적동역학、환원산물적물상전변급현미결구적변화규률。결과표명：예양화태정광재1100℃환원80 min후환원도체도96.04%；재온도위1000~1150℃범위내，환원과정수계면화학반응공제，표관활화능위95.25 kJ/mol。재환원과정중장회형성M 3 O 5형(M=Ti, Fe, Mg등)고용체，도치환원난도가대。현미결구표명，환원반응유과립변연향내부진행，이Mg원소재미반응내핵적부집조애료예양화태정광적진일보환원。
Reduction behavior of Panzhihua pre-oxidized ilmenite in hydrogen atmospheres, such as reduction kinetic, phase transformation and microstructures of reduced products was investigated by thermo-gravimetric , X-ray diffractometry (XRD), scanning electron microscopy (SEM), and optical microscopy. The results show that the reduction degree reaches 96.04% when the pre-oxidized ilmenite concentrates are reduced at 1 100 ℃ for 80 min and the reduction reaction is controlled by interfacial chemical reaction with the activation energy of 95.25 kJ/mol at 1 000-1 150 ℃. The M3O5 (Mis Fe, Ti, Mg, etc) solid solution forms in the reduction process, in which the reduction difficulty increases. Microstructure analysis shows that the reaction takes place from the exterior of the grain to its interior and the enrichment of Mg in the unreacted area restricts the further reduction of pre-oxidized ilmenite.