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Purification of Unrefined Nickel(II) Sulfate Solution by a Continuous Countercurrent Multistage Extraction with bis(2‐Ethylhexyl)phosphinic Acid
Author(s) -
Nagaosa Yukio,
ome Naoki
Publication year - 1997
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/(sici)1097-4660(199705)69:1<114::aid-jctb680>3.0.co;2-g
Subject(s) - nickel , cobalt , chemistry , manganese , zinc , extraction (chemistry) , countercurrent exchange , magnesium , liquid–liquid extraction , inorganic chemistry , cadmium , copper , heptane , selectivity , sulfate , nuclear chemistry , chromatography , organic chemistry , catalysis , physics , thermodynamics
Separation of cobalt(II) and nickel(II) using bis(2‐ethylhexyl)phosphinic acid as an extractant has been investigated by a liquid–liquid and a continuous countercurrent extraction. For comparison, 2‐ethylhexylphosphonic acid mono‐2‐ethylhexyl ester has also been used, and the results are discussed in terms of cobalt–nickel selectivity. Based on the results, a highly selective procedure using 20% bis(2‐ethylhexyl)phosphinic acid in heptane has been proposed to separate zinc(II), copper(II), manganese(II), cadmium(II), magnesium(II) and cobalt(II) from nickel(II). The separation method has been successfully applied to purification of unrefined nickel(II) sulfate solutions. © 1997 SCI.