Russian Journal of Applied Chemistry, 2011, Vol. 84, No. 4, pp. 727−729.
Pleiades Publishing, Ltd., 2011.
Original Russian Text © M.V. Buzaeva, O.A. Zaval’tseva, O.A. Davydova, V.V. Dubrovina, E.S. Klimov, 2011, published in Zhurnal Prikladnoi Khimii, 2011,
Vol. 84, No. 4, pp. 692−694.
Extraction of Heavy Metals from Galvanic Sludges
M. V. Buzaeva, O. A. Zaval’tseva, O. A. Davydova,
V. V. Dubrovina, and E. S. Klimov
Ulyanovsk State Engineering University, Ulyanovsk, Russia
Received June 16, 2010
Abstract—Extraction of copper, nickel, zinc, and chromium from galvanic sludges by various complexons
(pyrocatechol, phenanthroline, disodium ethylendiaminetetraacetate, and nitrilotrimethylenephosphonic acid)
Galvanic sludges (GS) are formed in processing waste
liquids of galvanic industry, scourage, sewage, and waste
technological solutions. Most of GS utilization proce-
dures lay down rather rigid requirements to the composi-
tion and properties of sludges, which makes problematic
the utilization of mixed sludges, and, furthermore, the
majority of utilization and neutralization procedures result
in irrevocable losses of non-ferrous metals .
To remove metal ions, to soften water, and to solve
other industrial problems at machine-building factories,
complexons forming stable metal complexonates are
rather widely applied .
The aim of the present work was the study of a pos-
sibility for selective extraction of metals from galvanic
sludges using complexons such as pyrocatechol, phenan-
throline, disodium ethylendiaminetetraacetate (EDTA),
and nitrilotrimethylenephosphonic acid (NTP).
Industrial galvanic sludges of a machine-building
factory were used as subjects of the study. The total
content of heavy metals in the dry galvanic sludge
was (g kg
): copper 5.97, nickel 4.49, zinc 4.22, and
chromium 35.20 (an S-115-М1 atomic absorption
spectrophotometer). Various amounts of complexons in
relation to a sludge volume were added to a GS suspension
(humidity of 95 % and density of 1.05 g cm
), stirred for
2 h, ﬁ ltered, and the content of metal ions in the ﬁ ltrate
was determined by a photometric method according to
federal nature protection normative documents: copper
NPND F 14.1:2.48-96, nickel NPND F 14.1:2.46-96,
chromium NPND F 14.1:2.52-96, and zinc NPND F
The degree of heavy metals extraction α (%) was
determined from the difference of total metal contents in
initial GS and in GS treated by a complexon:
α = –———– × 100.
Results of the analyses were processed by means of
the Microsoft Excel program .
Pyrocatechol (1,2-dihydroxybenzene) and o-phen-
anthroline (1,10-phenanthroline) belong to bidentate