Method of production of the granulated carbamide

FIELD: chemical industry; methods of production of the granulated carbamide.

SUBSTANCE: the invention is pertaining to the field of chemical industry, in particular, to the method of production of the granulated carbamide and may be used at the enterprises of the nitrogen production branch of industry producing carbamide as fertilizers. The method of production of the granulated carbamide provides for the crystalline carbamide melting, introduction of the modifying agent into the melt of the carbamide and granulation. In the capacity of the modifying agent they use the sediment of magnesium-ammonium-phosphate produced at the sewage purification from ions of ammonium or from phosphate ions, which is introduced into the carbamide melt in the form of the water suspension the finely dispersed magnesium-ammonium-phosphate with the content of water including crystallization water, of no more than 14 kg per 1 ton of the carbamide melt or in the form of the dry finely dispersed magnesium-ammonium-phosphate in amount of 5 - 10 kg per 1 ton of the carbamide melt. The technical result of the invention is the increased strength of the carbamide granules at the simultaneous improvement of the agrochemical efficiency of the fertilizers.

EFFECT: the invention ensures the increased strength of the carbamide granules at the simultaneous improvement of the agrochemical efficiency of the fertilizers.

8 ex, 1 tbl

 

The invention relates to the technology of granulated urea and can be used at the enterprises of the nitrogen industry, producing urea as fertilizer.

A method of obtaining granulated urea from water in the presence of modifiers-zeolites: clinoptilolite or mordenite in the form of a fine fraction with a grain size up to 100 μm in the amount of 0.25 to 0.50% by weight of water (see RF patent №2030371, IPC 05 C1/02, 07 With 273/16, 1992.08.25).

The disadvantage of this method is low agrochemical efficiency hardening the granules of urea supplements as clinoptilolite and mordenite consist of neoslavery plants aluminosilicates.

The closest way to the same destination to the claimed invention on the totality of symptoms is the way to obtain granules of urea, including the melting of crystalline urea, introducing a melt of urea finely dispersed inorganic material and granulation. The addition of finely dispersed inorganic material provides high strength granules of urea that can be used for direct introduction into the soil, or as a component of the blend fertilizer (see U.S. patent No. 5782951, 21.07.1998). This method is adopted for the prototype.

The disadvantage of this method adopted for about Otep, is low agrochemical efficiency hardening the granules of urea supplements due to the fact that the fine inorganic material selected from a number of: calcium oxide, calcium hydroxide, cement and dust, blahoslaveneho plants.

The characteristics of the prototype matching the characteristics of the proposed solutions - melting crystalline urea, the introduction of the urea melt modifier and granulation.

The objective of the invention is increased agrochemical efficiency hardening the granules of urea Supplement.

The task was solved due to the fact that in the known method for granulated urea, including the melting of crystalline urea, the introduction of the urea melt modifier and granulation, as a modifier use residue of miniaturist obtained from the treatment of wastewater from ammonium ions or phosphate ions, which contribute to the melt of urea in aqueous suspension with a water content, including crystallization, not more than 14 kg per 1 ton of molten urea or dry fine in the amount of 5-10 kg per 1 ton of molten urea.

The characteristics of the proposed method, the distinctive features of the prototype, is used as a modifier sludge miniaturist obtained from the treatment of wastewater from ammonia or from FOSFA the ions; introduction to the urea melt modifier in the form of an aqueous suspension with a water content, including crystallization, not more than 14 kg per 1 ton of molten urea or dry fine in the amount of 5-10 kg per 1 ton of molten urea.

The precipitate of miniaturist contains (wt.%): MgO - 4,9-of 29.4; P2O5- 8,7-51,7; NH3a 2.1 to 12.4; N2About the rest.

A method of obtaining a granulated urea is carried out according to the description in example 1.

Example 1. To obtain pellets of the melt used urea JSC "Mineral fertilizers". The addition of urea 60 grams were placed in a ceramic reactor with glycerin shirt. The reactor was heated to a temperature 138-140°C. Then, the molten urea was added to the prepared sample dried minced uranyl miniaturist MgNH4PO4·6H2O (accuracy 0.001 g) in an amount of 0.3 g (5 kg per 1 ton of urea). A mixture of urea with the additive was stirred for 10 minutes at a temperature 138-140°C. the melt Temperature was determined using thermometer, placed in the reactor.

The resulting melt was applied through the pipette in drip mode in a thermostatted vessel with a certain amount of mineral oil brand TP-22S (flash point 186°C, pour point -15°With a density of 900 kg/m3), which was the quickly cooling the granules of urea. The height of the oil layer in the vessel amounted to 0.15 M. the pellets were carefully freed from oil by using filter paper and sieved through a set of sieves. For testing were selected spherical granules fraction of 3.4-5 mm urea.

Static strength of granules was measured on the instrument measuring the strength of granules IPG-1 by standard procedures. Testing the crushing in the measurement of the average failure strength were subjected 28-32 granules of a certain party, obtained under the same conditions. Statistical processing of data on the strength of granules of urea was carried out on computers using the software package "Microsoft Excel". The water absorption of urea granules was determined from the change in mass of granules with a hinge 1 year, aged for 24 hours in a desiccator at 100%humidity.

The average static strength of granules was 1,115 kgf/Gran. The water absorption of the pellets was 0,098%.

Example 2.

The method is carried out analogously to example 1 with the difference that a portion of the dry uranyl miniaturist MgNH4PO4·6H2O was added to the melt of urea in an amount of 0.6 g (10 kg per 1 ton of urea). The average static strength of granules was 1,155 kgf/Gran. The water absorption of the pellets was 0,095%.

Example 3.

The method is carried out analogously to example 1 with the difference that the melt of urea added is avesco dry monohydrate miniaturist MgNH 4PO4·H2O in the amount of 0.3 g (5 kg per 1 ton of urea). The average static strength of granules was 1,660 kg/Gran. The water absorption of the pellets was 0,092%.

Example 4.

The method is carried out analogously to example 1 with the difference that a portion of the dry monohydrate miniaturist MgNH4PO4·H2O was added to the melt of urea in an amount of 0.6 g (10 kg per 1 ton of urea). The average static strength of granules was 1,564 kgf/Gran. The water absorption of the pellets was 0,099%.

Example 5.

The method is carried out analogously to example 1 with the difference that the addition of uranyl miniaturist MgNH4PO4·6H2O in the amount of 0.3 g (5 kg per 1 ton of urea) was added to the melt of urea in paste form with a humidity of 70%. The average static strength of granules was 1,031 kgf/Gran. The water absorption of the pellets was is 0.102%.

Example 6.

The method is carried out analogously to example 1 with the difference that the melt of urea was not added to any modifiers. The average static strength of granules was 0,943 kgf/Gran. The water absorption of the pellets was 0,103%.

Example 7.

The method is carried out analogously to example 1 with the difference that the melt of urea as a modifier was added finely dispersed calcium oxide (fraction-0.100 mm) in an amount of 0.6 g (10 kg per 1 ton of urea). Average the static strength of granules of urea amounted to 1,339 kgf/Gran. The water absorption of the pellets was 0,100%.

Example 8.

The method is carried out analogously to example 1 with the difference that the addition of uranyl miniaturist MgNH4PO4·6H2O in an amount of 0.6 g (10 kg per 1 ton of urea) was added to the melt of urea in paste form with a humidity of 70%. The average static strength of granules was 0,665 kgf/Gran. The water absorption of the pellets was 0,082%.

The results of the experiments presented in the table.

Table
No.Type modifierThe amount of modifier, kg/tThe amount of water in the modifier, kg/t ureaThe average static strength of granules Pwithkgf/GranWater absorption, %
1MgNH4PO4·6H2O5,02,21,1150,098
2MgNH4PO4·6H2O104,41,1550,095
3MgNH4PO4·H2O5,00,581,6600,092
4MgNH4PO4·H2O101,161,564 0,099
5Pasta

MgNH4PO4·6H2O
5,013,871,031is 0.102
6Without modifier000,9430,103
7Finely dispersed calcium oxide1001,3390,100
8Pasta

MgNH4PO4·6H2O
1027,730,6650,082

As can be seen from the table, the inventive method for granulated urea compared with the prototype allows to increase the strength of granules of urea from 1,339 to 1,660 kg/Gran., i.e. by 24% when using waste treatment technologies wastewater containing ammonium or phosphate ions, while improving agrochemical efficiency of granulated urea. The increase of water content, including crystallization, above 14 kg per 1 ton of molten urea leads to a decrease in the strength of the granules of urea.

A method of obtaining a granulated urea, including the melting of crystalline urea, the introduction of the urea melt modifier and granulation, characterized in that as a modifier use residue of miniaturist, receiving the hydrated when wastewater from ammonium ions or phosphate ions, which contribute to the melt of urea in aqueous suspension with a water content, including crystallization, not more than 14 kg per 1 ton of molten urea or dry fine in the amount of 5-10 kg per 1 ton of molten urea.



 

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