针对共伴生铁矿资源两步法短流程工业化经济性需求，以代表性钒钛磁铁矿为研究对象，围绕直接还原流态化甲烷自重整制备还原气工艺开展研究，重点突破直接还原共伴生铁矿重整催化活性低、高温高金属化率铁矿粉易粘结失流等共性基础问题。通过流态化直接还原前预氧化处理的方法改变原矿结构，以改善钒钛磁铁矿直接还原颗粒表面铁分布，调控后续直接还原金属铁晶粒尺寸，提升直接还原共伴生铁矿的自重整催化活性。通过局部锥形床方式调控细颗粒还原铁粉团聚，平衡粘结力与破碎力，实现高金属化率还原钒钛磁铁矿粉高温甲烷自重整过程的稳定流态化。最终为直接还原共伴生铁矿高效甲烷自重整制备还原气技术奠定科学基础，提高两步法工艺竞争力，促进共伴生铁矿有价金属资源的低耗高效综合利用。

To satisfy the economy of the complex iron ores two stages short process high effective utilization, taking titanomagnetite as the research object, this project conducts research on the basic problems of low catalytic activity of reduced titanomagnetite and defluidization at methane self-reforming high temperature. The pre-oxidation method is used to increase the titanomagnetite surface iron content and control the grain size of reduced iron, which can improve the catalytic activity of reduced titanomagnetite ore. By topical using the conical fluidized bed to adjust the agglomeration of fine reduced iron particle, the steady fluidization of high metallization degree titanomagnetite can be achieved. Finally, this project provides scientific support for the technology of high-efficiency reducing gas preparation by methane self-reforming in the complex iron ores direct reduction, enhancing the competitiveness of two stages short process, and promoting the low consumption and high efficiency of complex iron ores utilization.