An environmentally friendly design for low-grade diasporic-bauxite processing / Shu-hua Ma in Minerals engineering, Vol. 22 N° 9/10 (Août/Septembre 2009)  

Public ISBD [article]  inMinerals engineering > Vol. 22 N° 9/10 (Août/Septembre 2009) . - pp. 793–798 Titre : An environmentally friendly design for low-grade diasporic-bauxite processing Type de document : texte imprimé Auteurs : Shu-hua Ma, Auteur ; Zong-guo Wen, Auteur ; Ji-ning Chen, Auteur Année de publication : 2009 Article en page(s) : pp. 793–798 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : 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 [article] An environmentally friendly design for low-grade diasporic-bauxite processing [texte imprimé] / Shu-hua Ma, Auteur ; Zong-guo Wen, Auteur ; Ji-ning Chen, Auteur . - 2009 . - pp. 793–798. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 22 N° 9/10 (Août/Septembre 2009) . - pp. 793–798 Mots-clés : 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

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