Materials Transactions Online

Materials Transactions, Vol.59 No.04 (2018) pp.634-641
© 2018 The Mining and Materials Processing Institute of Japan

Equilibrium Modeling for Solvent Extraction of Nickel and Ammonia from Alkaline Media with the Extractant LIX84-I

Shubin Wang1, 2, Jie Li1, Hirokazu Narita2 and Mikiya Tanaka2

1School of Chemistry and Chemical Engineering, Central South University, Changsha, Hunan 410083, China
2Environmental Management Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba 305-8569, Japan

The equilibria for the extraction of nickel(II) and ammonia from ammonium salt solutions by using the extractant LIX84-I (active component, 2-hydroxy-5-nonylacetophenone oxime) dissolved in a non-polar diluent, ShellSol D70, were studied at pH 2-10 and 298 K under different ammonium salt concentrations, kinds of counter anions, aqueous phase pH values, and phase ratios. The distribution constant of the nickel-hydroxyoxime complex was independent of the kind and concentration of ammonium salt, and the logarithm of the extraction constant of nickel linearly increased with the ionic strength of the aqueous phase. By using the initial conditions and a model based on the present results and those of our previous study concerning copper extraction (Mater. Trans., 58 (2017), 1427-1433), we were able to predict the extraction behavior of nickel, copper, and ammonia from copper-nickel mixed ammonium sulfate solutions. The agreement between the predicted and experimental data confirmed the validity of our model.


(Received 2017/12/23; Accepted 2018/01/10; Published 2018/03/25)

Keywords: solvent extraction, nickel(II), copper(II), ammonia, equilibrium model, LIX84-I, co-extraction

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