Experiment on Direct Reduction of Iron from Vanadium Extraction Tailings by Adding Carbon
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摘要: 采用直接配碳的方式研究了从提钒尾渣还原铁的工艺流程，考察了配碳比、还原温度、时间对物料还原效果的影响，并借助XRD和SEM分析了温度和时间对提钒尾渣还原过程的影响。结果表明：在配碳比2.5、还原温度和时间分别为1 200℃和30 min的最佳工艺参数下，铁的金属化率为85%左右；金属化率随着温度的升高、还原时间的延长而升高；还原过程铁元素的变化规律为Fe2O3→Fe3O4→FeO→Fe；延长还原时间影响铁的品位。Abstract: The process of direct reduction of iron from vanadium extraction tailings by directly adding carbon was investigated. The effect of C/O ratio and reduction temperature and time on direct reduction of iron was analyzed by X-ray diffraction and scanning electron microscopy etc. The result shows that with the reduction temperature and time of 1200℃ and 30 min respectively,and C/O ratio of 2.5,the metallization ratio of iron can reach about 85%; the metallization ratio increases with the increase of temperature and reduction time; during the reduction,the element Fe varies following Fe2O3→Fe3O4→FeO→Fe; the quality of the iron is affected with the extension of reduction time.
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Key words:
- vanadium extraction tailings /
- C/O /
- iron /
- reduction /
- metallization ratio
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