INORGANIC SYNTHESIS AND INDUSTRIAL
Russian Journal of Applied Chemistry, 2011, Vol. 84, No. 11, pp. 1855−1859.
Pleiades Publishing, Ltd., 2011.
Original Russian Text © I.Yu. Gudkova, D.B. Lempert, A.S. Rozenberg, 2011, published in Zhurnal Prikladnoi Khimii, 2011, Vol. 84, No. 11, pp. 1769−1773.
Burning Chromium-containing Compounds
in the Filtration Combustion Mode
I. Yu. Gudkova, D. B. Lempert, and A. S. Rozenberg
Institute of Chemical Physics Problems, Chernogolovka, Moscow oblast, Russia
Received March 2, 2011
Abstract—Burning a chromium-containing compound in an air stream in the ﬁ ltration combustion mode was
examined. Stable combustion conditions were determined for a feed stock comprised of the chromium-containing
substance and an inert material.
One way of disposing leather production waste is
burning. However, because of low caloric value (high
content of water and other noncombustibles), combustion
of organic systems under normal conditions occurs at
a not very high temperature and, consequently, at a fairly
low speed and entails release of abundant incomplete
combustion products, thereby leading to severe environ-
mental contamination. The use of a ﬁ ltration combustion
process allows efﬁ cient burning of various low-calorie
waste organic materials [1–3] (lignin, low-calorie shale
and other fuels, medicine waste). In this context, it would
be natural to examine the burning of leather production
waste with the use of the same ﬁ ltration combustion
method, which speciﬁ cally affords high combustion
temperatures at fairly low caloriﬁ c values of fuels.
Filtration combustion process conducted with solid
fuel and oxidizing gas in counterﬂ ow is characterized by
the existence of certain ranges of governing parameters
(temperature, fuel : oxidant ratio) within which the heat
recovery is the most efﬁ cient, which leads to the so-called
superadiabatic heating [4, 5]. Combustion in superadia-
batic mode (SAM) has a number of speciﬁ c features: high
energy efﬁ ciency (up to 90–95%); maximal heating in a
narrow reaction zone with the temperature many times
exceeding the adiabatic temperature (as if all the released
heat energy was spent to heat the entire reaction space);
proceeding of a stationary combustion process at an ex-
tremely low fuel content (down to 4% coal); and existence
of spatially separated zones occurring in the oxidizing
(oxygen) and reducing (carbon monoxide) gas media.
When subjected to ﬁ ltration combustion, chromium-
containing feed stocks should form a poorly volatile
chromium(III) oxide which would remain in the ash. It
can be expected that, when in the SAM, combustion of
chromium-containing leather production waste would be
more complete compared to ordinary combustion, with
the residue comprised of a rich in chromium product
which could be returned to the production process.
Here, we determined the ﬁ ltration combustion pa-
rameters for feed stock samples containing chromium
in the form of chromium-containing leather production
waste, as well as the stable combustion conditions and
the chemical composition of the combustion products.
The feed stocks were comprised of a chromium-
containing and an inert component in a gaseous oxidant
(air) stream. Importantly, this system does not require
additional fuel, because leather is a combustible in itself.
The chromium-containing component was represented
by leather production waste comprised of a pressed ﬁ -
brous gray-blue mass. We examined leather samples with
the following composition, wt %: organic substances 52,
O 40, Cr 2, S 1.6, SO
Considering the available published data and
taking into account a collagen base of leather,