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Citation:
ZHANG Qian, WU Dong-Bei, BAO Bo-Rong. Extraction of Praseodymium and Neodymium with 8-Hydroxyquinoline[J]. Chinese Journal of Applied Chemistry,
;2008, 25(5): 609-612.
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In this paper,the extraction behaviours of Pr(Ⅲ) and Nd(Ⅲ) from equeous chloride acid medium employing 8-hydroquiloine (HQ) were studied.Equilibrium constant (Kex) in the extraction of Pr(Ⅲ) and Nd(Ⅲ) with 8-hydroxyquinoline in heptane was studied.The results show that the equilibrium constants of praseodymium and neodymium are nearly equal,Kex(Pr3+)=10-11.83,Kex(Nd3+)=10-11.70.The effect of aqueous acidity on the extraction of Pr3+ and Nd3+ with 8-hydroxyquinoline was discussed.The effects of extractant concentraction,different diluents and acetate ion on the extraction reaction were also studied.The results show that acetate ions took part in the extraction reaction in the forms of Pr(Ac-)2+,Nd(Ac-)2+,respectively;with increasing dielectric constant of dilution,the extraction percent decrease and the order is dichloromethane
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Keywords:
- Hydroxyquinoline,
- extraction,
- praseodymium,
- neodymium
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