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Thorium and uranium extraction from rare earth elements in monazite sulfuric acid liquor through solvent extraction / Janúbia C. B. S. Amaral in Minerals engineering, Vol. 23 N° 6 (Mai 2010) 

Public ISBD [article]  in Minerals engineering > Vol. 23 N° 6 (Mai 2010) . - pp. 498–503 Titre : Thorium and uranium extraction from rare earth elements in monazite sulfuric acid liquor through solvent extraction Type de document : texte imprimé Auteurs : Janúbia C. B. S. Amaral, Auteur ; Carlos A. Morais, Auteur Année de publication : 2011 Article en page(s) : pp. 498–503 Note générale : Génie Minier Langues : Anglais (eng) Mots-clés : Hidrometallurgy  Mineral  processing  Process  optimization  Extractive  metallurgy Résumé : This paper describes the process of extraction of thorium and uranium from the sulfuric liquor generated in the chemical monazite treatment through a solvent extraction technique. The influence of the extractant type and concentration, contact time between phases, type and concentration of the stripping solution and aqueous/organic volumetric ratio were investigated. The results indicated the possibility of extracting, simultaneously, thorium and uranium from a solvent containing a mixture of Primene JM-T and Alamine 336. The stripping was carried out with a hydrochloric acid solution. After selecting the best conditions for the process, a continuous experiment was carried out in a mixer-settler circuit using four stages in the extraction step, five stages of stripping and one stage of the solvent regeneration. A loaded stripping solution containing 29.3 g/L of ThO2 and 1.27 g/L of U3O8 was obtained. The metals content in the raffinate was below 0.001 g/L, indicating a thorium extraction of over 99.9% and a uranium extraction of 99.4%. The rare earths content in the raffinate was 38 g/L of RE2O3. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S089268751000004X [article] Thorium and uranium extraction from rare earth elements in monazite sulfuric acid liquor through solvent extraction [texte imprimé] / Janúbia C. B. S. Amaral, Auteur ; Carlos A. Morais, Auteur . - 2011 . - pp. 498–503. Génie Minier Langues : Anglais (eng) in Minerals engineering > Vol. 23 N° 6 (Mai 2010) . - pp. 498–503 Mots-clés : Hidrometallurgy  Mineral  processing  Process  optimization  Extractive  metallurgy Résumé : This paper describes the process of extraction of thorium and uranium from the sulfuric liquor generated in the chemical monazite treatment through a solvent extraction technique. The influence of the extractant type and concentration, contact time between phases, type and concentration of the stripping solution and aqueous/organic volumetric ratio were investigated. The results indicated the possibility of extracting, simultaneously, thorium and uranium from a solvent containing a mixture of Primene JM-T and Alamine 336. The stripping was carried out with a hydrochloric acid solution. After selecting the best conditions for the process, a continuous experiment was carried out in a mixer-settler circuit using four stages in the extraction step, five stages of stripping and one stage of the solvent regeneration. A loaded stripping solution containing 29.3 g/L of ThO2 and 1.27 g/L of U3O8 was obtained. The metals content in the raffinate was below 0.001 g/L, indicating a thorium extraction of over 99.9% and a uranium extraction of 99.4%. The rare earths content in the raffinate was 38 g/L of RE2O3. DEWEY : 622 ISSN : 0892-6875 En ligne : http://www.sciencedirect.com/science/article/pii/S089268751000004X