Method to produce nitrogen-sulfate fertiliser

FIELD: construction.

SUBSTANCE: method includes mixing solutions of ammonium nitrate and sulfate at the ratio that provides for the specified content of sulfate sulphur in a fertiliser, introduction of a modifying additive, steaming of the mixed solution at the finished temperature of the produced suspension that does not exceed 155C, granulation of suspension. The suspension prior to granulation is soaked during mixing for at least 30 minutes and steamed at the finished temperature of 186-198C. Granulation is carried out by prilling method.

EFFECT: invention makes it possible to produce a fertiliser that does not become caked when stored even without treatment of granules with amino-oil mix.

4 cl, 1 ex

 

The invention relates to methods for fertilizers containing nitrogen and sulfate sulfur, based on nitrate and ammonium sulfate and can be used in the chemical industry for the production of fertilizer type NS.

In agriculture, more and more applications are complex fertilizers based on ammonium nitrate, optionally containing sulphur compounds.

The growing interest of agricultural producers to the sulfur as an element of power plants is determined by a number of reasons: the decrease in the soil, increased production and consumption of free or low sulfur fertilizers and increased its removal from the soil in connection with the systematic growth of crops.

A known method of producing fertilizer containing nitrogen and sulfate sulfur, by neutralizing nitric acid with the addition of sulfuric acid with ammonia, parki neutralized solution with subsequent granulation of the target product [Production of ammonium nitrate in units of great power. Edited Vmelilo, 2nd edition. Chemistry, 1990, s-162]. The disadvantage of this method is to obtain a product with low content of sulphate sulphur: 0.1 to 0.15 wt.% or of 0.4-0.6 wt.% in terms of ammonium sulfate.

A method of obtaining attacullaculla fertilizers, including the preparation of an aqueous pulp the humidity 715 wt.% and a temperature of 80100C, containing ammonium nitrate and ammonium sulfate, with subsequent granulation drum granulator-dryer [U.S. Pat. Of the Russian Federation No. 2227792, IPC 7 SS 1/00, C05G/00, publ. 27.04.2004, bull. No. 12]. The disadvantage of this method is low consumer properties of produced fertilizers due to a mismatch of particle size distribution the requirements of modern consumers and the low strength of the granules.

The closest to the essential features and the result achieved by the claimed technical solution is a method for attacullaculla fertilizer, which is mixed solutions of nitrate and ammonium sulfate in a ratio that provides the content of sulphate sulphur in the fertilizer within the specified limits, enter the modifier phosphate additive mixed solution evaporated at finite temperature the resulting suspension within 142155C, the suspension granularit in a drum granulator-dryer [U.S. Pat. Of the Russian Federation No. 2344112, IPC 7 SS 1/00, publ. 20.01.2009].

The disadvantage of this method is unsatisfactory consumer properties of produced fertilizers. They become compressed during storage despite the use of phosphate builders. Introduction known magnesia additive or additives of aluminum sulfate also does not remove the seal of the product during storage. Caking Astronautical by additional processing of the granules amino-oil mixture. However, this significantly reduces the stability of fertilizers against detonation, i.e. makes them explosive.

Probable cause poor consumer properties is as follows.

From the scientific literature it is known that one of the main conditions for obtaining this type of fertilizer with high physical-mechanical and physical-chemical indicators is ensuring the fullest possible formation of structures of double salts 2NH4NO3(NH4)2SO4and 3NH4NO3(NH4)2SO4.

With regard to fertilizer with a relatively low content of sulphate sulphur (up to 8 wt.%) optimal is a two-component system consisting of double salts and ammonium nitrate. All the ammonium sulfate used for producing fertilizer, should be part of the double salts, i.e. in free form as a third phase should be absent.

Upon receipt attacullaculla fertilizer according to the method, apparently because of the low rate of structure formation of double salts of the above-described condition is not realized, which leads to the deterioration of consumer properties of the fertilizer.

The technical task of the present invention to provide a fertilizer, not caking during storage even without treatment granules amino is Aslani mixture, i.e. improvement of consumer properties.

This object is achieved in that in the method of obtaining attacullaculla fertilizer comprising mixing solutions of nitrate and ammonium sulfate in a ratio that provides the specified content of sulfate sulfur in the fertilizer, the introduction of modifying additives, oparka mixed solution at finite temperature the resulting suspension is not higher than 155C., the granulating suspension according to the invention, the suspension before granulation is maintained with stirring for at least 30 minutes and darpariaeth at finite temperature 186-198C.

The suspension before granulation is preferably maintained with stirring for 40-120 minutes.

The final temperature when dopravni suspension is preferably maintained within the range of 190-195C.

The granulating suspension exercise method pilirani.

Example

Mix 3590% (hereinafter,% mass) solution of ammonium nitrate and 4045%solution of ammonium sulfate mass ratio, providing the content of sulphate sulphur in the resulting fertilizer 3, 5 and 7%, enter the modifier additive from among known (phosphate, magnesium, aluminum sulfate) in an amount of 0.20.4% of MgO or 0,30,6% P2O5or 0,30,5% Al2O3in the fertilizer, the mixed solution is evaporated at finite temperature is E. the resulting suspension 140150C, one stripped off, the suspension is incubated under stirring for at least 30 minutes, optimally 40120 minutes, and darpariaeth at finite temperature the suspension 186198C, preferably 190195C.

Doverennyy suspension granularit method pilirani in Grand tower.

Get fertilizer grades 33:3, 32:5 and 30:6. Fertilizer storage is not compressed, requires processing unit aminobutyric mixture, which is confirmed by three independent tests:

- full-scale tests received fertilizer in stock - experienced party retained friability for at least 6 months;

- definition of a shortening according to GOST 21560.5 (friability 100%);

laboratory test, in accordance with which the sample is placed in a cylindrical shape, stand under a load of 0.5 kg/cm2within 7 days with subsequent determination of effort to break pressed briquettes. Sample after 7-day exposure were scattered in the disclosure form (pressure gap less than 0.1 kg/cm2). According to x-ray analysis fertilizer is a two-component system of ammonium nitrate and double salts, crystalline phase of ammonium sulfate is absent.

All experimental batches of fertilizer stand the test of resistance to detonation by the method specified in the Regulation (EC) No. 2003/2003 of the European Parliament and of the Council of 13.10.200.

Thus, the proposed method allows to solve the technical problem.

The positive effect is caused, apparently, by the fact that the alleged distinguishing features together provide optimal conditions for bottom-up structure formation of double salts.

Extract with stirring suspension formed by evaporation, for at least 30 minutes ensures the completion of the crystallization drop-down solid phase structure.

The optimal exposure time is 40120 minutes, while the upper limit is determined by economic considerations.

Dopirovanie suspensions at finite temperature 186198C provides a comprehensive structure formation of double salts on the stage of granulation.

The optimum temperature range when dopravni is 190195C.

1. The method of obtaining attacullaculla fertilizer comprising mixing solutions of nitrate and ammonium sulfate in a ratio that provides the specified content of sulfate sulfur in the fertilizer, the introduction of modifying additives, oparka mixed solution at finite temperature the resulting suspension is not higher than 155C., the granulating suspension, wherein the suspension before pelleting stand under stirring for at least 30 min and darpariaeth prionace temperature 186198C.

2. The method according to claim 1, characterized in that the suspension before granulation is preferably maintained with stirring for 40120 minutes

3. The method according to claim 1, characterized in that the end temperature of the suspension is maintained within the range of 190 to 195C.

4. The method according to claim 1, characterized in that the granulation is conducted by the method of pilirani.



 

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31 cl, 2 tbl, 3 ex

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