Separation of rare earth elements from sulfate leach liquor by heterocyclic nitrogen compound
来源期刊：JOURNAL OF RARE EARTHS2008年第4期
论文作者：OMNEYA M.El Hussaini NBIL T.El Hazek GHADA M.Mahmoud AHMAD M.Farag
Key words：triazolopyrimidine; extraction; stripping; precipitation; rare earths;
Abstract: Separation of rare earth elements by solvent extraction has actually been widely used in various fields from analytical chemistry to hydrometallurgy. A representative ore sample obtained from Kadabora Batholiths-Eastern Desert of Egypt, containing the multiple oxides rare earth minerals: Samarskite, Fergusonite, Betafite, and Pyrochlore, was subjected to sulfuric acid leaching. Different sets of equilibrium loading experiments were carried out on a bench scale for the extraction of rare earths (cerium and yttrium) from the sulfate leach liquor using 8,9-dihydro[1,2,4]triazolo[1,5-a]quinazolin-6(7H)-one {TQ} dissolved in methylene chloride. Stripping was carried out by 20% sodium hydroxide. A rare earth cake was produced by oxalic acid precipitation. Its purity reached 87.3%.
OMNEYA M.El Hussaini1，NBIL T.El Hazek1，GHADA M.Mahmoud1，AHMAD M.Farag2
(1.Nuclear Materials Authority, P.O. Box 530 El Maadi, Cairo Egypt;
2.Chemistry department, Faculty of Science, Cairo University, Giza, Egypt)
Abstract:Separation of rare earth elements by solvent extraction has actually been widely used in various fields from analytical chemistry to hydrometallurgy. A representative ore sample obtained from Kadabora Batholiths-Eastern Desert of Egypt, containing the multiple oxides rare earth minerals: Samarskite, Fergusonite, Betafite, and Pyrochlore, was subjected to sulfuric acid leaching. Different sets of equilibrium loading experiments were carried out on a bench scale for the extraction of rare earths (cerium and yttrium) from the sulfate leach liquor using 8,9-dihydro[1,2,4]triazolo[1,5-a]quinazolin-6(7H)-one {TQ} dissolved in methylene chloride. Stripping was carried out by 20% sodium hydroxide. A rare earth cake was produced by oxalic acid precipitation. Its purity reached 87.3%.
Key words:triazolopyrimidine; extraction; stripping; precipitation; rare earths;
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