| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Alumina and Bauxite
|
| Presentation Title |
Conversion Behavior of Iron-containing Minerals in the Process of Dissolving High-iron Bauxite by Starch Hydrothermal Method |
| Author(s) |
Yongfei He, Yiyong Wang, Jidong Li, Xingyuan Wan, Zhe Ning |
| On-Site Speaker (Planned) |
Yongfei He |
| Abstract Scope |
Abstract: In the process of hydrothermal dissolution of bauxite, reducing agent starch can simultaneously reduce and separate iron oxide. Thermodynamic calculations show that Fe2O3 can be converted to Fe3O4. Fe2O3 will dissolve in alkaline solution to form Fe(OH)4-. The starch can be decomposed under alkaline hydrothermal conditions and form a strong reduction system, and reduce Fe(OH)4- to Fe(OH)3- , Fe(OH)4- reacts with Fe(OH)3- to form Fe3O4, which realizes the directional transformation of hematite to magnetite. It is found that temperature and alkali concentration have a great influence on the hydrothermal reduction of Fe2O3, and the dissolution of aluminum and the reduction process of iron compounds promote each other. The dissolution rate of aluminum is 98.57%, the iron reduction rate is 98.41%, the magnetic separation rate is above 97.0%, and the iron grade is 73.5%. |
| Proceedings Inclusion? |
Planned: Light Metals |