摘要
采用煤基直接还原技术研究了钒钛磁铁矿含碳球团直接还原工艺,考察了还原工艺条件及硼砂添加量对球团金属化率的影响,并通过对不同温度下所得还原产物进行XRD分析,得出了钒钛磁铁矿直接还原过程的相变历程。研究结果表明,适当提高还原温度、配碳比和反应时间均有利于提高球团金属化率。在自然碱度下,还原温度1 300℃、还原时间30 min、C/O=1.4时,金属化率达到96%。向含碳球团中添加适量硼砂,可以促进钒钛磁铁矿的还原。XRD分析结果表明,铁氧化物主要经历Fe_2O_3→Fe_3O_4→FeO→Fe的还原过程,而钛氧化物主要经历Fe_2TiO_5→Fe_2TiO_4→FeTiO_3→Ti_2O_3、TiO_2、Ti_3O_5、TiO的还原过程。
Coal-based direct reduction technique was adopted in the research on direct reduction of carbon-containing pellet prepared with vanadium-bearing titanomagnetite. Effects of reduction process conditions and borax addition on metallization rate were investigated and the reduced products obtained at different temperatures were analyzed with X-ray diffraction,with a phase transition process obtained for vanadium-bearing titanomagnetite during the course of direct reduction. Results demonstrated that appropriately raising reduction temperature,increasing carbon fitting ratio and prolonging reduction time could improve the metallization rate of pellets. It is found that reduction at a temperature of1 300 ℃ for 30 min,with a natural basicity and C/O molar ratio of 1.4,led to the metallization rate up to 96%. And an appropriate addition of borax could promote the reduction process of vanadium-bearing titanomagnetite. The XRD analysis results showed the reduction processes of iron oxide include Fe2O3→Fe3O4→FeO→Fe,and the reduction processes of titanic oxide include Fe2TiO5→Fe2TiO4→FeTiO3→Ti2O3,TiO2,Ti3O5,TiO.
出处
《矿冶工程》
CSCD
北大核心
2017年第3期86-89,93,共5页
Mining and Metallurgical Engineering
基金
国家自然科学青年基金(5160041186)
关键词
钒钛磁铁矿
直接还原
含碳球团
金属化率
还原历程
vanadium-bearing titanomagnetite
direct reduction
carbon-containing pellet
metallization rate
phase transition in reduction
