高铬型钒钛磁铁矿高效利用过程有价组元选择性迁移及强化分离

As typical unmanageable metallurgical resources, Panzhihua high-chromium vanadium titano-magnetite owes extremely high comprehensive utilization value and strategic importance. Corresponding to satisfy major national strategic demands and steel industry sustainable development，it is imperative and urgent to utilize this resource at large scale. After considering the defects of current BF-BOF and coal-based direct reduction processes and the advantages of gas-based shaft furnace, one innovative process of oxidized pellets - shaft furnace reduction and selective smelting separation has been put forth in this project aiming to achieve high efficiency and clean utilization of high chromium vanadium-titanium magnetite, and mechanisms on selective migration and enhanced separation of valuable elements are systematically studied. With respect to critical steps and multiphase complex coupling reaction systems of the new process, the key scientific problems including the mechanism of oxidized toasting consolidation and characteristics of mineral phases reconstruction, multi-phase interfacial reaction mechanism and valuable elements transfer theories during selective reduction and smelting, the mechanism and influence factors of molten slag solidification, and mechanism and process optimization of high-efficiency separation and extracting of valuable elements are clarified by means of metallurgical transport theories, thermodynamics and kinetics, interface chemistry, process mineralogy and modern testing technologies, which would contribute to theory perfection and method innovation for the comprehensive utilization of high-chromium vanadium titano-magnetite.

攀枝花高铬型钒钛磁铁矿是具有极高综合利用价值和战略重要性的典型难处理特色资源。为了满足国家重大战略需求和促进钢铁工业可持续发展，该资源大规模开发势在必行。鉴于现有高炉和煤基非高炉流程有价组元利用率低、气基竖炉直接还原技术优势等因素，本项目以攀枝花高铬型钒钛磁铁矿高效清洁综合利用为目标，提出氧化球团-气基竖炉还原-熔化分离新工艺，进行铁与钒铬钛有价组元选择性迁移和强化分离机制的基础研究。针对新工艺氧化焙烧、气基竖炉还原、控制还原势熔分、钒钛铬分离提取等关键环节和多相多场耦合作用复杂反应体系，结合冶金物理化学、冶金反应工程学、界面化学、工艺矿物学以及现代测试技术，重点研究该矿氧化焙烧固结机理及矿物结构转化规律、选择性还原和熔分过程界面反应机制、有价组元迁移规律及调控途径、熔分渣凝固特性及其影响因素、有价组元高效分离机理及强化方法等关键科学问题，实现高铬型钒钛磁铁矿综合利用理论完善和方法创新。

攀枝花高铬型钒钛磁铁矿是具有极高综合利用价值和战略重要性的典型难处理特色资源。为了满足国家重大战略需求和促进钢铁工业可持续发展，该资源大规模开发势在必行。鉴于现有高炉和煤基非高炉流程有价组元利用率低、气基竖炉直接还原技术优势等因素，本项目以攀枝花高铬型钒钛磁铁矿高效清洁综合利用为目标，提出氧化球团-气基竖炉还原-熔化分离新工艺，系统进行了铁与钒铬钛有价组元选择性迁移和强化分离机制的基础研究。针对新工艺氧化焙烧、气基竖炉还原、控制还原势熔分、钒钛铬分离提取等关键环节和多相多场耦合作用复杂反应体系，结合冶金物理化学、冶金反应工程学、界面化学、工艺矿物学以及现代测试技术，重点研究了该矿氧化焙烧固结机理及矿物结构转化规律、选择性还原和熔分过程界面反应机制、有价组元迁移规律及调控途径、熔分渣凝固特性及其影响因素、有价组元高效分离机理及强化方法等关键科学问题，实现了高铬型钒钛磁铁矿综合利用理论完善和方法创新。