| Texto completo | |
| Autor(es): |
Pereira, Barbara da Rocha
;
Rosset, Morgana
;
Espinosa, Denise Crocce Romano
;
Tenorio, Jorge Alberto Soares
Número total de Autores: 4
|
| Tipo de documento: | Artigo Científico |
| Fonte: | JOM; v. N/A, p. 10-pg., 2025-04-09. |
| Resumo | |
Bauxite is the primary source material for producing alumina, and this research aims to use hydrometallurgical techniques to obtain a solution with a higher concentration of aluminum from bauxite. The study further explores methods to purify this solution and produce high-purity alpha-alumina. Several parameters were tested to determine the optimal solution for leaching all the aluminum from bauxite. The purification process involved batch ion exchange using two different resins: a cationic resin (Lewatit (R) TP207) and a cheating resin (Puromet MTS950). Leaching experiments revealed that 3 M sulfuric acid for 4 h at 90 degrees C with a solid-to-liquid ratio of 1:10 achieved successful aluminum extraction. Using S950 resin in batch ion exchange at pH 0.5 for 2 h at 25 degrees C, it was observed that 65% of the iron and only 1.5% of the aluminum were adsorbed. This resin was then employed in the continuous ion exchange process at a flow rate of 2 BV (bed volume). After passing through three series columns, 89% of the iron was adsorbed, but there was a 15% loss of aluminum. Finally, the solution was precipitated at a pH 3 using ammonium hydroxide. The resulting precipitate, calcined at 1200 degrees C, successfully produced alpha-alumina with a purity of 99.8%. (AU) | |
| Processo FAPESP: | 19/11866-5 - Desenvolvimento de processos inovadores para recuperação de metais críticos |
| Beneficiário: | Denise Crocce Romano Espinosa |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |