1070-4272/03/7611-1724$25.00C2003 MAIK [Nauka/Interperiodica]
Russian Journal of Applied Chemistry, Vol. 76, No. 11, 2003, pp. 1724!1727. Translated from Zhurnal Prikladnoi Khimii, Vol. 76, No. 11,
2003, pp. 1775!1778.
Original Russian Text Copyright + 2003 by Tikhonova, Gaivoronskii, Elliev, Gavrischuk, Mazavin, Yashina.
AND INDUSTRIAL INORGANIC CHEMISTRY
Influence of Conditions of Zinc Selenide Oxidation
with Atmospheric Oxygen on the Composition
of Volatile Products
E. L. Tikhonova, P. E. Gaivoronskii, Yu. E. Elliev, E. M. Gavrischuk,
S. M. Mazavin, and E. V. Yashina
Lobachevsky State University, Nizhni Novgorod, Russia
Institute of Chemistry of High-Purity Substances, Russian Academy of Sciences, Nizhni Novgorod, Russia
Received June 11, 2003
Abstract-The qualitative and quantitative composition of volatile products of zinc selenide oxidation with
atmospheric oxygen was determined. The influence of the process conditions on quantitative composition
of the volatile products was studied.
Oxidative roasting of ZnSe is one of ways of proc-
essing waste from its production. The advantages of
this method are that it does not require sophisticated
equipment and large amounts of expensive chemicals.
However, published data on the oxidation of powders
, polished plates [3, 4], and single crystals [5, 6]
of ZnSe are ambiguous . In particular, the com-
position of volatile products of ZnSe oxidation with
oxygen is still unclear.
In this connection, our goal was to determine the
quantitative composition of the volatile products of
ZnSe oxidation with atmospheric oxygen and also to
study how the process conditions affect their ratio.
The objects of the study were wastes of ZnSe plates
and spent polishing powders of various grain-size
distributions from manufacture of optical components
for IR engineering from polycrystalline zinc selenide.
The oxidation of small (10330 g) amounts of ZnSe
without forced air circulation (installation I) was
described in detail in .
We developed and manufactured installation II for
the oxidation of large (0.531.5 kg) amounts of zinc
selenide. It includes an inclined tubular quartz reactor
of length l = 400 mm and diameter d = 50 mm and
three receivers connected by ground-quartz joints. The
design of the first receiver allows unloading of the
formed product during operation of the installation.
Owing to the inclined arrangement of the reactor and
receivers, a nonforced steady-state air flow arises
when the reactor is heated with a tubular resistance
Later we developed and manufactured installa-
tion III for the oxidation of 4003500 g of zinc sele-
nide in a forced air flow (Fig. 1). The installation in-
cludes a quartz reactor (l = 1150, d = 16 mm) and
two receivers. The first of them consists of a narrow
part (l = 305, d = 20 mm) and a wide part (l = 370,
d = 40 mm). The receiver is tightly connected to the
reactor by the narrow part, and the wide part serves
for collecting volatile products. The second receiver,
which has the size of the wide part of the first receiver,
is connected to it by ground-quartz joints. The reactor
is heated with a tubular resistance furnace. The con-
trollable air flow is created with a compressor; a spe-
cial unit is arranged at the outlet to keep the flow con-
stant. The flow rate at the reactor outlet was measured
at regular intervals with a rotameter. The completeness
of the condensation of volatile products was checked
at the outlet of the second receiver using a qualitative
test for Se(IV) with thiourea according to the tech-
nique suggested in .
Fig. 1. Installation for the oxidation of zinc selenide in
a forced air flow: (1) tubular resistance furnace, (2) reactor
with a substance sample, (3) asbestos gasket, and (4, 5) re-
ceivers for volatile products.