Chemically based model to predict distribution coefficients in the Cu-LIX 65N and Cu-KELEX 100 systems
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the l a s t d e c a d e m a n y c o m m e r c i a l c h e l a t i n g r e a g e n t s for the e x t r a c t i o n of c o p p e r f r o m l e a c h l i q u o r s have been i n t r o d u c e d to the i n d u s t r y . The G e n e r a l M i l l s s e r i e s of LIX r e a g e n t s which a r e b a s i c a l l y h y d r o x y o x i m e s have b e e n u s e d in a l l the c o m m e r c i a l c o p p e r l i q u i d - l i q u i d e x t r a c t i o n p l a n t s now in o p e r a tion. 1"~ The p r o p e r t i e s of the d i f f e r e n t r e a g e n t s a v a i l a b l e f o r use in m e t a l l i q u i d - l i q u i d e x t r a c t i o n p r o c e s s e s have been r e v i e w e d by F l e t t . 1~ M o r e r e c e n t l y , A s h b r o o k n r e v i e w e d the c h e m i s t r y of the h y d r o x y o x i m e r e a g e n t s . O t h e r r e f e r e n c e s to the use of h y d r o x y o x i m e s f o r the e x t r a c t i o n of c o p p e r f r o m d i l u t e a c i d l e a c h l i q u o r s have b e e n r e p o r t e d in the literatures.'2-~7 LIX 65N, a ~ - h y d r o x y benzophenone o x i m e i s p r o d u c e d and m a r k e t e d by G e n e r a l M i l l s C h e m i c a l Co, f o r u s e in the e x t r a c t i o n of c o p p e r f r o m d i l u t e a c i d i c l e a c h l i q u o r s . T y p i c a l a n a l y s i s of LIX 65N s u g g e s t s that the r a t i o of syn and anti f o r m i s 1 : 7.~8 A n o t h e r r e a g e n t s p e c i f i c a l l y d e v e l o p e d for the r e m o v a l of c o p p e r f r o m dilute a c i d l e a c h l i q u o r is K E L E X 100, an a l k y l ~ - h y d r o x y quinoline d e v e l o p e d b y A s h l a n d C h e m i c a l Co. T h i s r e a g e n t i s y e t to be u s e d in any of the m a j o r l i q u i d - l i q u i d e x t r a c t i o n p l a n t s . T h e d e v e l o p m e n t of a c h e m i c a l l y b a s e d t h e r m o d y n a m i c e q u i l i b r i u m m o d e l f o r d e s c r i b i n g and p r e d i c t ing the d i s t r i b u t i o n c o e f f i c i e n t have b e e n r e p o r t e d by s e v e r a l i n v e s t i g a t o r s . ~9-26 O ' B r i e n and B a u t i s t a ~9,2~ d e v e l o p e d a t h e r m o d y n a m i c m o d e l to p r e d i c t the d i s t r i b u t i o n c o e f f i c i e n t f o r a s i n g l e component s y s t e m Nd(NOs)3-HNOs-H2 ~ H D E H P - A m s c o . T h e m o d e l is a function of the h y d r o gen ion a c t i v i t y in the aqueous p h a s e , the aqueous n i t r a t e ion a c t i v i t y , the a c t i v i t y of HDEHP d i m e r , and the s t a b i l i t y c o n s t a n t s f o r the f o r m a t i o n of the lanthanide nitrate complexes. N e v a r e z and B a u t i s t a el,22 d e r i v e d a p r e d i c t i v e t h e r m o d y n a m i c e q u i l i b r i u m m o d e l f o r the l i q u i d - l i q u i d YING-CHU HOH, formerly Graduate Fellow, Iowa State University, is now Associate Scientist, Institute of Nuclear Energy Research, Taiwan, Republic of China and RENATO G. BAUTISTA is Group Leader, Ames Laboratory DOE and Associate Professor,
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