1070-4272/03/7610-1699 $25.00 C 2003 MAIK [Nauka/Interperiodica]
Russian Journal of Applied Chemistry, Vol. 76, No. 10, 2003, pp. 1699!1701. Translated from Zhurnal Prikladnoi Khimii, Vol. 76, No. 10, 2003,
Original Russian Text Copyright + 2003 by Bairamov.
Effect of Conditions of Electric-Spark Dispersion
of Zinc on the Quality of the Product Obtained
R. K. Bairamov
Olimpiya Ltd., Novomoskovsk, Tula oblast, Russia
Novomoskovsk Institute, Mendeleev Russian University of Chemical Technology, Novomoskovsk, Tula oblast, Russia
Received November 21, 2002; in final form, June 2003
Abstract-Influence exerted by additives introduced into the working solution, and by iron or copper formed
in electric-spark dispersion of these metals and zinc, on the quality of the products obtained in electric erosion
As noted previously , the attention given to
the behavior of dispersed metal particles after their
removal from the spark discharge zone is insufficient.
This is due to the fact that the literature covers in-
completely the application of the method of electric-
spark dispersion of metals for obtaining highly dis-
persed materials, even though the working principle
of the method has long been known and is employed
successfully in metal working and, in particular, in
electric-erosion processing of metal articles to obtain
complex profiles and apertures [2, 3].
The present study is concerned with the influence
exerted by additives introduced into the working so-
lution, and by iron or copper formed in electric-spark
dispersion of these metals and zinc, on the quality of
the products obtained in the process.
The product quality was checked by determining
its absorption capacity in gas purification to remove
hydrogen sulfide. The electric-spark dispersion of
metal was carried out on an installation, and using
a procedure, described in . The reactor was for
the most part filled with zinc granules and had zinc
electrodes fixed at its edges. As working solution
served distilled water with various additives. Pulsed
current (pulse repetition frequency 700 Hz) was passed
through the reactor . The product obtained in elec-
tric erosion of zinc was filtered off and dried at a tem-
perature of 100oC.
Further, the dried product was compacted and then
ground. To determining the absorbing capacity of
the samples studied, the 0.2530.50-mm fractions were
taken. The sulfur absorption capacity of a sample,
Q (wt %), is the amount of sulfur absorbed by unit
mass of the sample in gas purification to remove H
which is defined as the ratio of the sample masses (g)
before and after an experiment, multiplied by 100.
The sulfur absorption capacity was determined by
passing a gas mixture containing hydrogen and 1.33
1.4 vol % hydrogen sulfide (which is 18318.5 g m
in terms of elementary sulfur) through a sample bed
at a rate of 5000 h
. The temperature of the sample
bed was maintained at 400oC, and the gas mixture
was passed to complete saturation with sulfur, i.e.,
until the concentrations of H
S in the gas mixture
before and after the sample became equal.
Figure 1 shows the results obtained in studying
the influence exerted by the working solution com-
ponents used in electric erosion on the value of Q for
Fig. 1. Sulfur absorption capacity Q of samples prepared
from products formed in electric erosion of zinc vs. con-
centration c of additives present in the working solution.
Sludge treatment temperature 25oC, treatment duration 4 h.
Additive: (1, 2) citric acid and (3, 4) tartaric acid.
(1, 3) Sample drying temperature 100oC; (2, 4) temper-
ature and time of sample calcination 450oC and 5 h.