Russian Journal of Applied Chemistry, 2009, Vol. 82, No. 4, pp. 704−705.
Pleiades Publishing, Ltd., 2009.
Original Russian Text
R.Ya. Dashkevich, A.V. Aleksandrov, 2008, published in Khimicheskaya Promyshlennost’, 2008, Vol. 85, No. 7, pp. 338−340.
TECHNOLOGY OF ORGANIC
AND INORGANIC CHEMISTRY
Experimental Demonstration of Cooling Rate Inﬂ uence
of an Aluminiferous Cake on Amount
of an Alumina Secondary Loss
R. Ya. Dashkevich and A. V. Aleksandrov
Siberian Federal University, Russia
Received August 1, 2008
Abstract—An influence of cake standing in a range of 630−680°C on its quality is demonstrated by industrial
experiments on a grate cooler. An increase for the time of the cake standing from 1.6 to 4.9 min in the range of
630−680°C in the grate cooler leads to 3% growth in β-C
S amount and reducing α-C
S amount to 4%.
O and of hydrous
O which are cause
of the alumina and alkaline losses [1, 2].
Polymorphic modiﬁ cations of the dicalcium silicate,
alongside of the leaching, inﬂ uence signiﬁ cantly on
kinetics of its decomposition. Difference of an reactivity
of the dicalcium silicate modiﬁ cations with alkaline
aluminum solution is as a result of a distinct structure of
a crystal lattice.
A.F. Dumskaya studying an effect of the cooling time
of the aluminiferous cake on a recovery efﬁ ciency of
useful constituents included that the cake cooling from
1300 to 900
−600°C in a range of 20−30 min led to 3−4%
increase in the recovery of Al
and 2−3% increase
in the recovery of alkalis in comparison with an usual
cooling regime .
In the laboratory conditions it was found  that an
increase in the time of the cake standing at the temperature
°C leads to diminishing the secondary alumina
In our paper we studied an effect of the cooling rate
on the aluminiferous quality in plant conditions.
Experiments were performed on the grate cooler
“Volga-125” where the cake heated to 1100
along a grate through the series of the temperature area
cooled to 100
For understanding of the effects of the cake standing
time in the temperature areas of 630–680°C we varied
Technical and economic efﬁ ciency of ways of alumina
manufacturing based on binding the alumina with
formation of dicalcium silicate is substantially determined
by interaction extent between latter and aluminate alkaline
solutions. As a result the alumina amount in the aluminate
solution increases and besides the loss of alumina and
alkaline as hydrous aluminum silicates and hydrous
garnets forming by leaching occurs.
Well-known that the secondary loss of alumina at
the leaching of the cake are caused by decomposition of
α- and β-2CaO·SiO
S) resulting in a transfer of SiO
in solution and further in formation of hydrous sodium
The temperature distribution of the cake cooling along the