含钛高铁铝土矿磁化焙烧矿相演变规律及铁铝分离机制

项目以H2（CO）为还原剂，采用悬浮磁化焙烧-矿石活化-拜耳溶出-赤泥磁选的思路，处理一水硬铝石型高铁铝土矿，实现铁铝高效分离。研究焙烧条件（还原气体浓度、温度、时间）等重要参数对含铁矿物的物相演变、饱和磁化强度及微观结构的影响规律，非均质矿相中铁矿物还原的非等温介/宏观还原动力学，焙烧温度与磁化率、活性氧化铝形态的相关性，揭示铁铝矿类质同晶解离机制；研究焙烧过程铝矿物转变及活化控制条件，铝的拜耳溶出动力学行为，溶出过程铁铝水化石榴石的生长动力学控制特征，尤其是添加石灰对钛铁水化石榴石形成机制及其对含铁矿物磁化率的影响，建立多相反应动力学模型；在赤泥中含铁矿物保持较高磁性的基础上，研究磁场强度、液固比对磁选分离铁的影响机制。项目可为“先铝后铁”技术奠定更加坚实的理论基础。

Aim to achieve an efficient separation and utilization of iron and aluminum for high-iron diaspore ores, this project proposes to magnetize iron minerals and active the aluminum phases by a suspension magnetization roasting with the reducante of H2(CO) gas, and then separate and recover Al and Fe by Bayer leaching and red mud magnetic separation respectively. Study the effects of the roasting conditions (reducing gas concentration, temperature and time etc.) on the mineralogical evolution, saturation magnetization intensity and microstructure of iron-bearing minerals. Non-isothermal medium/macroscopic reduction kinetics of iron minerals in heterogeneous mineral phases, and the correlation between roasting temperature and magnetic efficiency as well as actived-Al2O3 morphology will be investigated to reveal the mechanism of iron-alumina isomorphic dissociation. Furthermore, the aluminum mineral transformation and activation control conditions during the roasting, kinetic behavior of aluminum in Bayer dissolution process, the growth kinetics control characteristics of iron-aluminum hydrated garnet, especially the formation mechanism of titanium-iron hydrated garnet and its influence on the magnetic efficiency of iron-bearing minerals will be well studied to establish a multi-phase reaction kinetic model. On the basis of maintaining high magnetic properties for iron minerals in red mud, the influence mechanism of magnetic field strength and liquid-solid ratio on magnetic separation of iron will be investigated. The project will provide a more substantial theoretical foundation for the "aluminum before iron" technology.