Russian Journal of Applied Chemistry, 2009, Vol. 82, No. 6, pp. 1123−1127.
Pleiades Publishing, Ltd., 2009.
Original Russian Text
R.K. Kurbaniiazov, A.M. Reimov, Sh.S. Namazov, B.M. Beglov, 2009, published in Khimicheskaya Promyshlennost’, 2009, Vol. 86, No. 2,
TECHNOLOGY OF ORGANIC
AND INORGANIC CHEMISTRY
Nitrogen-Phosphoric Fertilizers Obtained by Interaction
of the Concentrated Solutions of Ammonium Nitrate
with the Mineralized Mass of the Phosphorites
of Central Kyzylkum
R. K. Kurbaniiazov, A. M. Reimov, Sh. S. Namazov, and B. M. Beglov
Institute of General and Inorganic Chemistry, Academy of Sciences of Republic Uzbekistan, Tashkent, Uzbekistan
Received November 25, 2008
Abstract—-The results of determination of composition and strength of the granules of nitrogen-phosphoric
fertilizers containing 1.5 to 5.0% of P
, obtained by interaction of the mineralized mass of the phosphorites of
Central Kyzylkum with the 70−90% solutions of ammonium nitrate at 110°C, are presented.
The particle size distribution (disperseion composition)
of the mineralized mass appeared as follows: 2−0.5
mm 4.4%; 0.5−0.315 mm, 10.2%; 0.315−0.16 mm,
34.1%; 0.16−0.1 mm, 14.5%; 0.1−0.063 mm, 16.3%;
0.063−0.05 mm, 4.7%, and >0.05 mm, 15.8%.
The experiments were carried out in the thermostatically
controlled cylindrical reactor of a volume of 200 ml,
equipped with a paddle mixer. Thermostat was ﬁ lled
with glycerol. The solutions of 70, 75, 80, 85 and 90%
concentration were prepared. To the reactor with the
solution of ammonium nitrate was gradually dosed the
mineralized mass in the amount to provide 5% content of
in the ﬁ nal composition. The process of interaction
duration was 30 min, at 110°C. After that the obtained
pulp was dried at 100−105°C and then analyzed on the
content of various forms of phosphorus, calcium, nitrogen
by standard methods . The assimilable forms
of phosphorus and calcium were determined by measuring
solubility in the 2% citric acid.
The granulation of product was performed as follows.
After the end of interaction the content of reactor was
poured into the china cup and intensively mixed by glass
rod. The round solid particles formed upon cooling. The
mass of these particles was dried, cooled, and then was
sown according to the sizes. The particles with the size
of 2−3 mm there analyzed on the strength of granules
according to GOST 21560.2-82.
The results of studies are given in Tables 1 and 2.
The purpose of this work is double. First, to convert
multitonnage production waste of phosphorite powder
at the Kyzylkum phosphorite plant, namely, mineralized
mass, containing 12−14% of P
, into the effective
phosphoric fertilizer. This would be successful when not
assimilable form of P
in the raw material is transformed
into the form assimilable by plants. Second, to obtain the
stabilized ammonium nitrate. Achieving the ﬁ rst goal
will make it possible to increase the gross release of the
phosphorus-containing fertilizers from the poor phosphate
raw material. Reaching of the second goal will considerably
improve the quality of the most important multitonnage
nitric fertilizer, such as is ammonium nitrate.
Reality of the stated problems follows from the works
[1−7] showed that working up of rich by carbonate but poor
by phosphate raw material by solution or molten ammonium
nitrate leads to the sharp increase in the content of the
assimilable by plants form of P
. In  was indicated
the perspective of adding the phosphorus-containing
additive to the ammonium nitrate, which would not only
remove a tendency to cake, but also to a considerable degree
increase its explosion-proof properties.
In our work we used the mineralized mass of the
phosphorites of Central Kyzylkum of the following
composition (wt %): P
total 14.68; CaO 40.80; Al
1.37; MgO 0.53; F 1.85; CO
assimilable : P
total = 16.41%, and ammonium nitrate,
produced by joint stock company “Maksam-Chirchik”.