| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Alumina & Bauxite
|
| Presentation Title |
Digestion Efficiency Improvement of Gibbsite-boehmite Bauxite |
| Author(s) |
Fengqin Liu, Songqing Gu, Huaitao Zhang, Michael A. Ren, Zegang Wu, Han Lu, Mingzhuang Xie |
| On-Site Speaker (Planned) |
Michael A. Ren |
| Abstract Scope |
Bayer digestion performance of gibbsite-boehmite bauxite is studied. Chemical and mineral compositions of gibbsite-boehmite bauxite from Australia are analyzed and tested by XRF, XRD and SEM. Test results show bauxite contains > 50% of alumina (gibbsite and boehmite) and about 9% silica (kaolinite and quartz). Its digestion efficiency is studied in detail with various digestion conditions such as temperatures, holding times and additives. A medium-temperature digestion technology has been developed based on study results and industrial tests in Chinese refineries: boehmite in bauxite will be totally digested at 225-250℃ for just a few minutes with bits of lime addition for a high alumina recovery efficiency and most inert silica minerals in bauxite at a stable state so caustic consumption reduced by over 10%, alumina recovery efficiency increased by 2-3% compared with traditional digestion technologies. There is a greater application prospect with this medium temperature digestion technology for Australian bauxite. |
| Proceedings Inclusion? |
Planned: Light Metals |
| Keywords |
Other, Other, Other |