| Titre : | An environmentally friendly design for low-grade diasporic-bauxite processing (2009) |
| Auteurs : | Shu-hua Ma, Auteur ; Zong-guo Wen, Auteur ; Ji-ning Chen, Auteur |
| Type de document : | Article : texte imprimé |
| Dans : | Minerals engineering (Vol. 22 N° 9/10, Août/Septembre 2009) |
| Article en page(s) : | pp. 793–798 |
| Note générale : | Génie Minier |
| Langues : | Anglais |
| Tags : | Non-ferrous metallic ores Digestion Environmental Mineral economics |
| Résumé : | A new environmentally friendly design for low-grade diasporic-bauxite processing which is different from the Bayer and sintering processes was proposed in this paper. In the redesign of alumina production technology, a mixture of bauxite ore and sodium hydroxide solution was heated at a higher temperature for the purpose of complete decomposition of bauxite. The products were then extracted by water; the resulting sodium aluminate solution was further purified and used for the gibbsite precipitation, the residue being reacted with a caustic liquor to recover sodium oxide and alumina. The experimental results show that during the new process bauxite decomposition rates approach 100% and the residues can be easily recovered. When diasporic ores with mass ratio of alumina to silica of approximately 5:1 are treated, total alumina recovery efficiency of 86% and a sodium oxide presence below 1.5% in the final red mud will be achieved. This new design surpasses previous approaches in terms of high resource efficiency and low environmental impact. |
| DEWEY : | 622 |
| ISSN : | 0892-6875 |
| En ligne : | http://www.sciencedirect.com/science/article/pii/S0892687509000491 |
