ELECTRODIALYTIC RECOVERY OF COBALT(II)
1877
(2) The rate of Co2+ extraction grows as the current
density is raised within the range 0–4.2 mA cm–2 and
the cobalt(II) concentration in the donating solution
increases within the range from 1 × 10–3 to 0.05 M
and is only slightly changed when the concentration of
di(2-ethylhexyl)phosphoric acid in the organic phase is
varied from 5 to 50 vol %.An increase in the sulfuric acid
concentration in the starting solution (1 × 10–3–0.1 M
and in that of tri-n-octylamine in the liquid membrane
(0.05–0.4 M) adversely affects the transmembrane
transfer rate of cobalt(II) ions.
(3) The transfer rates of Co2+ ions across the liquid
membrane into 1 × 10–2 M solutions of perchloric,
sulfuric, hydrochloric, and nitric acids are approximately
the same. As the acid concentration is lowered, the
organic phase may appear in the aqueous solution.
An increase in the acid concentration in the receiving
solution causes a decreases in the degrees of cobalt(II)
extraction and electrodeposition.
4. Lisovskii, V.B., Gubin, A.F., and Volkovskaya, E.I.,
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