ISSN 1070-4272, Russian Journal of Applied Chemistry, 2008, Vol. 81, No. 12, pp. 2084–2087. © Pleiades Publishing, Ltd., 2008.
Original Russian Text © A.A. Geidarov, 2008, published in Zhurnal Prikladnoi Khimii, 2008, Vol. 81, No. 12, pp. 1971–1974.
Extractive Recovery of Gallium(III) from Acid
Sulfate Solutions with Primary Amines
A. A. Geidarov
Institute of Chemical Problems, National Academy of Sciences of Azerbaijan, Baku, Azerbaijan
Received January 29, 2008
Abstract—Liquid extraction of Ga(III) ions with technical-grade aliphatic amines from sulfate media at a tem-
perature of 20
5°C was studied. The composition of the complex being extracted was determined and the equation
of the reaction of Ga(III) extraction with primary amines was derived. The equilibrium constant of the reaction
of gallium(III) extraction from acid sulfate solutions was found.
Gallium(III) is a typical scattered element and its
concentration in raw materials and technological in-
dustrial products from which gallium compounds are
recovered is low. Therefore, a key task of the gallium
(III) technology is its primary recovery and concentra-
tion. A successful solution of this problem should be
promoted by wide introduction of extractive and sorp-
tion processes previously employed for recovery, con-
centration, and purification of numerous rare and non-
ferrous metals [1–4] into the chemical technology of
gallium(III). Despite that the number of studies de-
voted to extraction of gallium(III) is sufficient, they
are mostly concerned with its recovery from alkaline
media  and chloride solutions . Information about
extraction of gallium(III) from neutral and acid sulfate
solutions is rather scarce. The possibility of using ali-
phatic amines for extraction of gallium(III) was de-
scribed in [1, 2, 6–10]. Gallium(III) is recovered from
acid chloride solutions via the reaction of GaCl
with the ammonium cation:
This communication reports on a study of the ex-
traction of gallium(III) ions from sulfate solutions with
technical-grade primary aliphatic amines.
INORGANIC SYNTHESIS AND INDUSTRIAL
The possibility of gallium(III) recovery from sul-
fate solutions with primary, secondary, and tertiary
alkylamines in chloroform was first described by
Shevchuk . It was shown that gallium(III) can exist
in the organic phase as acido complexes [Ga(SO
] and chloroform solutions of di-
n-ionylamine and tri-n-octylamine hardly extract gal-
lium(III) at all from acid sulfate solutions.
We carried out the study with the use of technical-
grade mixture of primary aliphatic amines (ANPO
produced from liquid paraffins of general formula
where m + n = 10 to 16 carbon atoms, manufactured
by Deneprodzerzhinsk chemical combine; bp = 240–
345°C, extractive agent density 0.899 g cm
tive index 1.51, average molecular mass 185 g mol
Burning kerosene served as a diluent.
Our preliminary experiments demonstrated that a
5-min mixing with aqueous and organic phases by
shaking is sufficient for equilibrium to be attained.
The complete phase stratification is achieved in 1–3 min.
The phase ratio was V
= 1 : 2 in all the experi-
ments. The content of gallium(III) in the aqueous and
organic phases was found by photocolorimetry ,
and the concentration of sulfate ions in equilibrium
organic phases, by gravimetry, in the form of BaSO
We prepared the starting aqueous Ga-containing
solutions [Ga(III) = 7.2
M] from Ga
O produced using the method described in .