CAJ | 학술논문

研究预氧化钒钛磁铁精矿固态还原反应的动力学，采用XRD、SEM和EDS等手段研究还原产物的显微结构和物相变化，在此基础上，对其固态还原机理进行研究。结果表明：以煤为还原剂，在还原温度为950~1100°C时，预氧化钒钛磁铁精矿的固态还原受界面化学反应控制，反应的表观活化能为67.719 kJ/mol；预氧化钒钛磁铁精矿的还原历程可描述为：预氧化钒钛磁铁精矿→钛铁晶石→钛铁矿→亚铁板钛矿(FeTi2O5)→(FenTi1-n)Ti2O5。预氧化钒钛磁铁精矿在1050°C还原60 min后，还原产物中会形成M3O5型(M为Fe、Ti、Mg、Mn等)固溶体，存在于M3O5固溶体中铁的难还原性是限制预氧化钒钛磁铁矿还原的主要原因。
연구예양화범태자철정광고태환원반응적동역학，채용XRD、SEM화EDS등수단연구환원산물적현미결구화물상변화，재차기출상，대기고태환원궤리진행연구。결과표명：이매위환원제，재환원온도위950~1100°C시，예양화범태자철정광적고태환원수계면화학반응공제，반응적표관활화능위67.719 kJ/mol；예양화범태자철정광적환원역정가묘술위：예양화범태자철정광→태철정석→태철광→아철판태광(FeTi2O5)→(FenTi1-n)Ti2O5。예양화범태자철정광재1050°C환원60 min후，환원산물중회형성M3O5형(M위Fe、Ti、Mg、Mn등)고용체，존재우M3O5고용체중철적난환원성시한제예양화범태자철광환원적주요원인。
The solid-state reduction kinetics of pre-oxidized vanadium-titanium magnetite concentrate was studied. The phase and microstructure of the reduction product were characterized by XRD, SEM and EDS methods, based on which the mechanism of the solid-state reduction was investigated. The results showed that using coal as reductant at 950-1100 °C, the solid-state reduction of the pre-oxidized vanadium-titanium magnetite concentrate was controlled by interface chemical reaction and the apparent activation energy was 67.719 kJ/mol. The mineral phase transformation during the reduction process can be described as follows: pre-oxidized vanadium-titanium magnetite concentrate→ ulvospinel→ ilmenite→ FeTi2O5→ (FenTi1-n)Ti2O5. M3O5-type (M can be Fe, Ti, Mg, Mn, etc) solid solutions would be formed during the reduction process of the pre-oxidized vanadium-titanium magnetite concentrate at 1050 °C for 60 min. The poor reducibility of iron in M3O5solid solutions is the main reason to limit the reduction property of pre-oxidized vanadium-titanium magnetite concentrate.