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Solvent extraction of Nd using organo‐phosphorus extractants from chloride media
Author(s) -
Padhan Eliza,
Sarangi Kadambini
Publication year - 2015
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.4498
Subject(s) - chemistry , extraction (chemistry) , stripping (fiber) , neodymium , chloride , solvent , solvent extraction , partition coefficient , nuclear chemistry , chromatography , inorganic chemistry , materials science , organic chemistry , laser , physics , optics , composite material
Abstract INTRODUCTION A comparative study on solvent extraction of neodymium using both acidic and neutral form of phosphonic, phosphinic and thiophosphinic acid extractants from chloride media has been carried out. The extractants used for the study were PC88A, Cyanex 272 and Cyanex 302. RESULTS In this study the effect of different parameters such as equilibrium pH, extractant concentration, A:O phase ratio and temperature on Nd extraction was investigated. With increasing pH and extractant concentration the percentage extraction of Nd increased for all these extractants. The percentage extraction of Nd was maximum with NaCyanex 302. So after optimizing the extraction and stripping conditions, the McCabe–Thiele plots for neodymium extraction and stripping were constructed with 0.025 mol L −1 NaCyanex 302 at pH 4.2 and 0.08 (v/v)% sulphuric acid, respectively. CONCLUSION The McCabe–Thiele plots indicated two stages for both extraction and stripping at A:O ratio of 1. The extracted species was determined to be NdA 3. 5HA. The thermodynamic parameters such as ΔH, ΔS and ΔG were calculated. The loading capacity of NaCyanex 302 for Nd and the synergistic coefficient of NaCyanex302 with NaCyanex272 and NaPC88A were determined. The effect of different salts such as NaCl, NaNO 3 and Na 2 SO 4 on extraction of Nd was also studied. © 2014 Society of Chemical Industry