TY - JOUR
T1 - Selective Extraction of Scandium by a Long Alkyl Chain Carboxylic Acid/Organophosphonic Ester Binary Extractant
AU - Sharaf, Maha
AU - Yoshida, Wataru
AU - Kubota, Fukiko
AU - Goto, Masahiro
N1 - Funding Information:
This work was supported by Grants-in-Aid for Science Research (grant numbers JP16K0830 and 16K14462) from the Ministry of Education, Culture, Sports, Science and Technology of Japan, and the Environment Research and Technology Development Fund (ERTDF, grant number 3-1710) of the Ministry of the Environment, Japan, and The Salt Science Research Foundation, No.1704 and 1805.
Publisher Copyright:
© 2018, © 2018 Taylor & Francis Group, LLC.
PY - 2018/11/10
Y1 - 2018/11/10
N2 - The organophosphorus extractant 2-ethylhexylphosphonic acid mono-2-ethylhexyl ester (PC88A) is widely used for solvent extraction of rare earth elements in an acidic leaching solution, but stripping of the loaded metals is difficult because of the high affinity between the metals and the extractant. Adding 100 times the concentration of neodecanoic acid (Versatic 10) to the extractant solution reduces the extraction ability for scandium (Sc) and enables quantitative stripping of the loaded Sc with a mild acidic solution, such as a 1 M mineral acid. The loading capacity is dependent on the PC88A concentration, so PC88A is the main species responsible for Sc extraction in the binary mixture. Nuclear magnetic resonance spectroscopy (NMR) of the organic phases suggests a potential interaction between the mixed extractants through the change in the hydrogen bonding. This causes an antagonistic effect and facilitates efficient Sc stripping from the extractant solution, so this method could be used for scandium recovery in industry.
AB - The organophosphorus extractant 2-ethylhexylphosphonic acid mono-2-ethylhexyl ester (PC88A) is widely used for solvent extraction of rare earth elements in an acidic leaching solution, but stripping of the loaded metals is difficult because of the high affinity between the metals and the extractant. Adding 100 times the concentration of neodecanoic acid (Versatic 10) to the extractant solution reduces the extraction ability for scandium (Sc) and enables quantitative stripping of the loaded Sc with a mild acidic solution, such as a 1 M mineral acid. The loading capacity is dependent on the PC88A concentration, so PC88A is the main species responsible for Sc extraction in the binary mixture. Nuclear magnetic resonance spectroscopy (NMR) of the organic phases suggests a potential interaction between the mixed extractants through the change in the hydrogen bonding. This causes an antagonistic effect and facilitates efficient Sc stripping from the extractant solution, so this method could be used for scandium recovery in industry.
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U2 - 10.1080/07366299.2018.1532139
DO - 10.1080/07366299.2018.1532139
M3 - Article
AN - SCOPUS:85055518412
SN - 0736-6299
VL - 36
SP - 647
EP - 657
JO - Solvent Extraction and Ion Exchange
JF - Solvent Extraction and Ion Exchange
IS - 7
ER -