我国钒、钛储量巨大，属于国家战略性矿产经济资源，但因钒钛磁铁精矿品位低，矿相结构复杂，尚未实现其中有价元素的全面高效提取利用。本项目针对此问题，基于流化床直接（预）还原-电炉深（终）还原熔分两步法短流程工艺，开展其中关键技术环节的基础理论研究。重点研究揭示钒钛磁铁精矿气基流态化还原行为机制及非铁氧化物对流化状态作用机理，表征钒钛磁铁精矿直接还原内部矿相结构变化及还原气体析碳行为和活性，为强化流化床预还原及与电炉深还原熔分工艺衔接提供理论依据。考察钒钛磁铁精矿预还原状态和还原剂存在形式对熔分进程影响，揭示还原熔分过程物相富集和元素迁移规律，明晰渣铁高效分离及熔渣有价元素矿相重构机制，为钒钛磁铁精矿高效还原熔分及钛渣分选提质奠定理论基础。

China has huge reserves of vanadium and titanium mineral resources which belonging to country strategic economic resources. Since low-grade of titanomagnetite (TTM) concentrate with complex structure, the comprehensive utilization of titanomagnetite (TTM) concentrate has not been achieved. Base on the fluidized-bed pre-reduction and electric furnace smelting separation process, fundamental research on the fluidized-bed reduction and smelting separation of TTM concentrate are conducted. The main researching program is focused as follows: mechanisms of TTM concentrate fluidized reduction behaviors and nonferrous oxides influence on fluidization, characterize phase structure changes in reduction and carbon deposition, investigate the effects of TTM concentrate pre-reduction state and reductant existence forms on melting separation process, reveal regulars of molten phase concentration and element migration, clear the kinetics of the efficient separation between slag and iron and valuable elements mineral phase reconstruction in molten slag. The researching result to be got can provide scientific foundation for the developing of the high efficient of fluidized-bed reduction and smelting separation of TTM concentrate and Ti rich slag further upgrade.