| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Alumina & Bauxite
|
| Presentation Title |
Development of a Hydrometallurgical Process to Obtain High-purity Alumina Using Bauxite |
| Author(s) |
Bárbara Rocha Pereira, Morgana Rosset, Amilton Barbosa Botelho , Jorge Alberto Soares Tenório |
| On-Site Speaker (Planned) |
Amilton Barbosa Botelho |
| Abstract Scope |
High-purity alumina (HPA) is used in various economic sectors. The Bayer process produces 98.7% alumina from bauxite. Therefore, it is necessary to develop a proprietary methodology for the production of HPA (99.99%) directly. An alternative is the use of hydrometallurgical routes, which have reduced toxic waste generation. The objective of this study is to obtain HPA from bauxite using hydrometallurgical processes. Various acids, temperature, solid/liquid ratio, and time were evaluated in the leaching. The purification consisted of solvent extraction, in which several parameters were tested. Subsequently, precipitation followed by calcination was performed. The liquors resulting from the tests were quantified by ICP-OES. The leaching results showed that H2SO4 extracted 100% of the iron and aluminum present in the sample. In the extraction with D2EHPA, 98% of the iron was removed. The precipitate with NH4OH was calcined resulting in an alumina of 99.99%. |
| Proceedings Inclusion? |
Planned: Light Metals |
| Keywords |
Hydrometallurgy, Process Technology, Other |