Methods for obtaining fertilizers based upon ammonium phosphate at controlled release of nutrients

FIELD: agriculture, obtaining fertilizers.

SUBSTANCE: the method suggested deals with supplementing materials to aqueous viscous paste or powder of ammonium phosphate to control the release of nutrients chosen out of the following lest: montmorillonite, granulated montmorillonite, lignin containing alkaline lignin and lignosulfonate, or acidified zeolite, acidified montmorillonite, acidified granulated montmorillonite, acidified lignin containing acidified alkaline lignin and acidified lignosulfonate. Content of materials that provide controlled release of nutrients in fertilizer corresponds to 3-35% against the weight (based upon dry weight of ammonium phosphate powder), and content of water after condensation corresponds to 25-35% against the weight (based upon dry weight of ammonium phosphate viscous paste). It is possible to acidify the mixture of ammonium phosphate and materials that provide controlled release of nutrients before condensation with sulfuric acid. Application of the suggested fertilizer increases the efficiency in digesting nutrients by plants, activity period of the fertilizer is more prolonged and its cost has been decreased.

EFFECT: higher efficiency of application.

10 cl, 8 ex

 

The background to the present INVENTION

1. The technical field to which the present invention

The present invention relates to methods for fertilizers based on ammonium phosphate, and more particularly to methods for fertilizers based on ammonium phosphate with controlled release of nutrients, i.e. fertilizers release nutrients which is gradually and effectively for soil.

2. Description of the prior art,

The ammonium phosphate is one of the most important compound fertilizers containing nitrogen and phosphorus are the two major nutrients for plants, and its share of the world market for phosphate fertilizers is 58%. The ammonium phosphate is applied as the basic and additional fertilizer, but more often as the main component of mixed or complex fertilizers as ammonium phosphate has excellent compatibility and compatibility with various other fertilizers. The ammonium phosphate and other phosphate fertilizers, such as superphosphate, double superphosphate, nitrophosphate and calcium phosphate and magnesium inherent in the major disadvantage that they are easily associated with substances of soils and their nutrients slowly released and become available for plants. So the WMD phosphate fertilizers inefficient from the point of view of long-term release of nutrients, they are not completely absorbed by the plants, the efficiency of absorption of phosphate fertilizers during the growing season ranges from 15% to 20%.

The invention is designed for partial or complete removal of the above disadvantage inherent in the known phosphate fertilizers.

A BRIEF DESCRIPTION of the INVENTION

The first objective of the present invention is to provide a method for producing fertilizer based on ammonium phosphate with controlled release of nutrients, which would have excellent efficacy and low cost.

The second objective of the invention is to provide a method for producing fertilizer based on ammonium phosphate, which as materials that provides controlled release of nutrients, you would use the materials from the point of view of agriculture useless, thanks to which we provided low cost fertilizers based on ammonium phosphate and increasing the efficiency of its application.

The third objective of the invention is to provide a method for producing fertilizer based on ammonium phosphate, which would not require the use of additional new production equipment to ensure the most economical process of producing fertilizer.

what other benefits and advantages of the invention will become apparent after a careful reading of the detailed description, below.

DETAILED DESCRIPTION of the INVENTION

The method of producing fertilizer based on ammonium phosphate with controlled release of nutrients according to the invention includes the following operations: crushing, grinding, mixing, activation and drying, and adding, in the process of producing fertilizer, materials that provide controlled release of nutrients to the aqueous slurry of ammonium phosphate or dry ammonium phosphate.

The process of making fertilizer method according to the invention is described in detail below.

(A) Adding crushed material providing controlled release of nutrients to the aqueous slurry of ammonium phosphate before or this aqueous slurry of ammonium phosphate content of crushed material from 3% to 35% by weight (calculated on the basis of the dry weight of the aqueous slurry of ammonium phosphate);

mixing the aqueous slurry of ammonium phosphate added material providing controlled release of nutrients, until a homogeneous mixture;

thickening of the mixture of the aqueous slurry of ammonium phosphate and material providing a controlled release of nutrients, to reduce water content in the mixture to 25%-35%; and

gra is lirovanie obtained condensed mixture of the aqueous slurry of ammonium phosphate and material providing controlled release of nutrients, to obtain granulated fertilizers based on ammonium phosphate, the method of granulation is selected from the following list: granulation of the slurry, spray granulation, fluidized bed granulation.

(B) Adding crushed material providing controlled release of nutrients to the aqueous slurry of ammonium phosphate before this thickening of the aqueous slurry of ammonium phosphate content of crushed material from 3% to 35% by weight (calculated on the basis of the dry weight of the aqueous slurry of ammonium phosphate);

mixing the aqueous slurry of ammonium phosphate added material providing controlled release of nutrients, until a homogeneous mixture;

acidification of the mixture by adding thereto sulfuric acid in an amount of from 1% to 20% by weight (calculated on the basis of the dry weight of the aqueous slurry of ammonium phosphate);

condensation obtained was acidified mixture of the aqueous slurry of ammonium phosphate and material providing a controlled release of nutrients, to reduce water content in the mixture to 25%-35%; and

granulating the obtained condensed mixture of the aqueous slurry of ammonium phosphate and material providing controls which has been created, the release of nutrients, to obtain granulated fertilizers based on ammonium phosphate, the method of granulation is selected from the following list: granulation of the slurry, spray granulation, fluidized bed granulation.

(C) Adding crushed material providing controlled release of nutrients and water to the dried powder of ammonium phosphate, the content of crushed material providing controlled release of nutrients, ranging from 3% to 35% by weight (based on dry weight of the powder of ammonium phosphate), and the water content is from 3% to 40% by weight (based on dry weight of the powder of ammonium phosphate);

mixing powder of ammonium phosphate added material providing controlled release of nutrients, and water until a homogeneous mixture;

careful grinding the mixture;

activation of components of the mixture by laying in a heap; and

drying the activated mixture to obtain fertilizers based on ammonium phosphate with controlled release of nutrients.

(D) Adding crushed material providing controlled release of nutrients and water to the dried powder of ammonium phosphate, the content of crushed Mat is the Rial, providing controlled release of nutrients, ranging from 3% to 35% by weight (based on dry weight of the powder of ammonium phosphate), and the water content is from 3% to 40% by weight (based on dry weight of the powder of ammonium phosphate);

mixing powder of ammonium phosphate added material providing controlled release of nutrients, and water until a homogeneous mixture;

careful grinding the mixture;

acidification of the mixture by adding thereto sulfuric acid in an amount of from 1% to 20% by weight (calculated on the basis of the dry weight of the powder of ammonium phosphate);

activation of the mixture by keeping her in the activation chamber to obtain crude fertilizers; and

drying the resulting crude fertilizers to obtain fertilizers based on ammonium phosphate with controlled release of nutrients.

Material that provides a controlled release of nutrients, consists of at least one of the substances selected from the following list: zeolite, montmorillonite, granulated montmorillonite, lignin containing alkaline lignin and lignosulphonate (lignosulfonate) or lignosulfonate (lignosulphonate). Material that provides a controlled release of nutrients, used the above methods (C) and (D), include acidification stage, consists of at least one of the substances selected from the following list: acidified zeolite, acidified montmorillonite, acidified granulated montmorillonite, acidified lignin containing acidified alkaline lignin and acidified the lignosulphonate (lignosulfonate) or lignosulfonate (lignosulphonate). Material that provides a controlled release of nutrients, is crushed into a powder with particle sizes that they are sifted through a sieve with cells from 0.2 mm to 0.04 mm

In the process of producing fertilizer based on ammonium phosphate according to the invention can be added to one or more of the above materials, providing controlled release of nutrients, and the total amount of materials that provide controlled release of nutrients in the fertilizer composition is from 3% to 35% by weight (calculated on the basis of the dry weight of the ammonium phosphate).

These types of materials, providing a controlled release of nutrients as zeolite, montmorillonite, smectite (sukhovolya clay or whitening clay), granulated montmorillonite, acidic zeolites, acidified and acidified montmorillonite granulated montmorillonite, are inorganic substances is mi and have excellent ion exchange capacity for the formation of chemical bonds with groups of NH 4+and H2PO4-in the ammonium phosphate and the formation of complex compounds with group H2PO4-.

These types of materials, providing a controlled release of nutrients as the acidified lignin and lignin, are organic substances, they have a complex three-dimensional polycyclic structure and many such functional groups as hydroxyl, carboxyl and Amin. These functional groups of organic substances that provide a controlled release of nutrients, form a chemical bond with the groups NH4+and H2PO4-in the ammonium phosphate and form complex compounds with group H2RHO4-. Due to physico-chemical interactions between materials that provide controlled release of nutrients, and ammonium phosphate decreases kristallizirovany ammonium phosphate, which results in increasing its ability to withstand fixation in the soil and leaching, resulting in a longer duration fertilizer actions and higher efficiency power plants.

In the fertilizer according to the invention, the material providing a controlled release of nutrients, forms a phosphate is ammonia chemical bonding and complex compounds, therefore, the release of nutrients containing nitrogen and phosphorus, is slow, and they are absorbed by plants during the whole vegetation period. Thus, the application of fertilizers according to the invention nutrients containing nitrogen and phosphorus, are not spent is futile to fixation in the soil, and the effectiveness of their use increases.

In the following examples describe specific embodiments of the present invention. In Examples 1-4 material that provides controlled release of nutrients is added to the aqueous slurry of ammonium phosphate, as in Examples 5-8 material that provides controlled release of nutrients is added to the dried powder of ammonium phosphate.

Example 1

The aqueous slurry of ammonium phosphate, the water content of which ranged from 55% to 65%, in the amount of 100 tons in the evaporation apparatus was mixed with crushed material, providing a controlled release of nutrients, as which was used zeolite, montmorillonite, granulated montmorillonite, or lignin with such particle size that they are sifted through a sieve with cells of 0.16 mm in an amount of from 3.5 tons to 4.5 so the Mixture of the aqueous slurry of ammonium phosphate and zeolite were mixed until a homogeneous status the status, after what has been thickening up until the water content was not decreased to 25%-35%. Thereafter, the condensed mixture was subjected to drying to obtain fertilizers based on ammonium phosphate with controlled release of nutrients in the form of powder or granules, and the granulation was carried out using techniques such as granulation of the slurry, spray granulation or fluidized bed granulation.

Example 2

The aqueous slurry of ammonium phosphate, the water content of which ranged from 55% to 65%, in the amount of 100 tons in the evaporation apparatus was mixed with crushed material, providing a controlled release of nutrients, as which was used acidified zeolite (or acidified montmorillonite, or acidified granulated montmorillonite, or acidified lignin) with such particle size that they are sifted through a sieve with cells of 0.16 mm in the amount of from 2.8 tons to 3.6 so the Mixture of the aqueous slurry of ammonium phosphate and acidified zeolite was mixed until obtaining a homogenous mixture, and then subjected to condensation as long until the water content was not decreased to 25%-35%. Thereafter, the condensed mixture was subjected to drying to obtain fertilizers based on ammonium phosphate with controlled-release nutrient of gamestv the form of powder or granules, this granulation was carried out using techniques such as granulation of the slurry, spray granulation or fluidized bed granulation.

Example 3

The aqueous slurry of ammonium phosphate, the water content of which ranged from 55% to 65%, in the amount of 100 tons in the evaporation apparatus was mixed with crushed material, providing a controlled release of nutrients, as which was used acidified zeolite (or acidified montmorillonite, or acidified granulated montmorillonite, or acidified lignin) with such particle size that they are sifted through a sieve with cells of 0.16 mm in the amount of from 2.8 tons to 3.6 t and sulfuric acid in an amount of from 2.1 tons to 2.7 so the Mixture of the aqueous slurry of ammonium phosphate, acidified zeolite and sulfuric acid was mixed until obtaining a homogenous mixture, and then subjected to thickening up until the water content was not decreased to 25%-35%. Thereafter, the condensed mixture was subjected to drying to obtain fertilizers based on ammonium phosphate with controlled release of nutrients in the form of powder or granules, and the granulation was carried out using techniques such as granulation of the slurry, spray granulation or fluidized bed granulation.

Example 4

Magnacarta ammonium phosphate, the water content of which ranged from 55% to 65%, in the amount of 100 tons in the evaporation apparatus was mixed with crushed material, providing a controlled release of nutrients, as which was used zeolite (or montmorillonite, or granulated Mont-morillonite, or lignin) with such particle size that they are sifted through a sieve with cells of 0.16 mm in the amount of from 2.8 tons to 3.6 t and sulfuric acid in an amount of from 2.1 tons to 2.7 so the Mixture of the aqueous slurry of ammonium phosphate, zeolite and sulfuric acid were mixed until a homogeneous state, after what has been thickening up until the water content was not decreased to 25%-35%. Thereafter, the condensed mixture was subjected to drying to obtain fertilizers based on ammonium phosphate with controlled release of nutrients in the form of powder or granules, and the granulation was carried out using techniques such as granulation of the slurry, spray granulation or fluidized bed granulation.

Example 5

Powdered phosphate ammonium in the amount of 100 tons was mixed with crushed material, providing a controlled release of nutrients, as which was used zeolite (or montmorillonite, or granulated montmorillonite, or lignin) with Taimyrenergo particles, they sifted through a sieve with cells of 0.16 mm in quantities of 10 tonnes and with water in the amount of 8 so the Mixture of the powder of ammonium phosphate, zeolite and water were thoroughly mixed and subjected to grinding to achieve a homogenous mixture, after which the mixture was placed in a heap and left 1-3 days for activation. Thereafter, the condensed mixture was subjected to drying to obtain fertilizers based on ammonium phosphate with controlled release of nutrients in the form of particles.

Example 6

Powdered phosphate ammonium in the amount of 100 tons was mixed with crushed material, providing a controlled release of nutrients, as which was used acidified zeolite (or acidified montmorillonite, or acidified granulated montmorillonite, or acidified lignin) with such particle size that they are sifted through a sieve with cells of 0.16 mm in quantities of 10 tonnes and with water in the amount of 8 so the Mixture of the powder of ammonium phosphate, acidified zeolite and water were thoroughly mixed and subjected to grinding to achieve a homogenous mixture, after which the mixture was placed in a heap and left 1-3 days for activation. Thereafter, the condensed mixture was subjected to drying to obtain fertilizers based on ammonium phosphate with controlled, visualaid the tion of nutrients in the form of particles.

Example 7

Powdered phosphate ammonium in the amount of 100 tons was mixed with crushed material, providing a controlled release of nutrients, as which was used zeolite (or montmorillonite, or granulated montmorillonite, or lignin) with such particle size that they are sifted through a sieve with cells of 0.16 mm in the amount of 8 tons and with water in the amount of 8 so the Mixture of the powder of ammonium phosphate, zeolite and water were thoroughly mixed and subjected to grinding to achieve a homogeneous condition. Then in a mixing apparatus, in which there was obtained a mixture of, for acidification was added sulfuric acid in an amount of 5 so then acidified mixture was subjected to activation in the activation chamber, in result of which was the maturation of the mixture and obtaining the crude fertilizers. After this crude fertilizer was subjected to drying to obtain fertilizers based on ammonium phosphate with controlled release of nutrients as the final product.

Example 8

Powdered phosphate ammonium in the amount of 100 tons was mixed with crushed material, providing a controlled release of nutrients, as which was used zeolite in an amount of 4 t and lignin with such particle size that they Ave seiwald through a sieve with cells of 0.16 mm in the amount of 3 t and with water in the amount of 8 so the Mixture of the powder of ammonium phosphate, zeolite, lignin and water were thoroughly mixed and subjected to grinding to achieve a homogeneous condition. Then in a mixing apparatus, in which there was obtained a mixture of, for acidification was added sulfuric acid in an amount of 5 so then acidified mixture was subjected to activation in the activation chamber, in result of which was the maturation of the mixture and obtaining the crude fertilizers. After this crude fertilizer was subjected to drying to obtain fertilizers based on ammonium phosphate with controlled release of nutrients as the final product.

The analysis of the obtained product

1. To examine the structure of fertilizers based on ammonium phosphate with controlled release of nutrients according to the invention, used x-ray diffraction. As a result of this analysis, it was found that in comparison with the known fertilizer based on ammonium phosphate fertilizer, obtained by the method according to the present invention, has a lower degree of kristallizirovany. For analysis of chemical bonds used method of infrared spectroscopy. As a result of this analysis, it was found that the characteristic peaks of the groups NH4+and H2 PO4-fall is the appearance of new diffraction peaks at wavelengths 0,3292 nm and 0,3366 nm.

2. The ability to withstand fixation in the soil

Fertilizer based on ammonium phosphate with controlled release of nutrients according to the invention in quantities of 0.5 g was applied into the soil, which was taken in the amount of 400 g, and to maintain soil moisture, water was added. Received the fertilized soil was cultivated during the period of time from 2 days to 5 days, then was placed in the water environment (water volume was 800 ml) for 6 hours. Then, this aqueous slurry containing fertilized the soil was subjected to filtration, and the liquid fraction was analyzed for phosphorus content. And filtered soil was analyzed for content of available phosphorus and soluble phosphorus. For comparison, the same test has been known fertilizer based on ammonium phosphate. As a result of the research it was found that the phosphorus content in the liquid fraction and the content of available phosphorus and soluble phosphorus in the soil, which was made fertilizer based on ammonium phosphate with controlled release of nutrients according to the invention, is higher than in the case of known fertilizers based on ammonium phosphate.

For the connectivity

Fertilizer based on ammonium phosphate with controlled release of nutrients according to the invention and known fertilizer based on ammonium phosphate was applied in the same areas of the corn fields laterite (laterite - red glandular porous clay soil in equal amounts. The harvest of corn, removed from the site, the soil of which was applied fertilizer based on ammonium phosphate with controlled release of nutrients according to the invention, exceeded the harvest gathered from the site, the soil of which were made known fertilizer based on ammonium phosphate, 10%-35%, which suggests that the application of fertilizers according to the invention is more efficient absorption of nutrients containing nitrogen and phosphorus than when using known fertilizers based on ammonium phosphate.

Fertilizer based on ammonium phosphate with controlled release of nutrients according to the invention is also used for plants grown in pots, in equal quantities with known fertilizer based on ammonium phosphate.

The experiment showed that the efficiency of absorption of phosphorus in the application of fertilizers according to the invention is increased by 5%-35%, and the efficiency of absorption of nitrogen is increased by 5%-38% CPA is to use known fertilizers based on ammonium phosphate. According to the analysis of the structure of the fertilizer based on ammonium phosphate with controlled release of nutrients according to the invention has a lower degree of kristallizirovany than the well-known fertilizer based on ammonium phosphate, which is a direct evidence of greater efficiency in the uptake of fertilizer. According to analysis by the method of infrared spectroscopy of matter comprising a material providing a controlled release of nutrients associated with groups of NH4+and HnPO4ammonium phosphate is a strong chemical bonds and produce covalent binding, whereby increasing the ability to resist leaching and extended the period of release of nutrients.

As follows from the above description, the fertilizer obtained by the method according to the present invention has the following advantages:

1. All materials used in fertilizer, obtained by the method according to the present invention, the materials that provide controlled release of nutrients, from the point of view of agriculture is still considered useless, but in the fertilizer according to the invention, thanks to them, the efficiency of nutrient absorption, as well as the reduction of the cost of fertilizers based on ammonium phosphate with controlled release of nutrients. Thus, the present invention opens up new possibilities of transformation of industrial and agricultural wastes into useful resources.

2. Fertilizer based on ammonium phosphate with controlled release of nutrients obtained by the method according to the present invention, has excellent ability to withstand fixation in the soil, thus improving the efficiency of nutrient absorption and further increase yields. In addition, the fertilizer based on ammonium phosphate with controlled release of nutrients obtained by the method according to the present invention, has excellent ability to withstand washout, making it possible to avoid eutrophication, leading to algae overgrowing them, i.e. fertilizer, obtained by the method according to the present invention, is gentle on the environment.

3. To obtain fertilizers based on ammonium phosphate with controlled release of nutrients by the proposed method does not require additional equipment, i.e. to obtain it can be used in existing equipment, providing cost savings associated with the acquisition of new equipment and its operation.

The invention which was described above in the examples of the preferred variants of its implementation, and medium appropriate specialist profile should be clear that other modifications and variations of the present invention, without departing from its spirit and is not beyond its size, which is defined in the following claims.

1. The method of producing fertilizer based on ammonium phosphate with controlled release of nutrients, including the following:

adding to the aqueous slurry of ammonium phosphate at least one or more materials that provide controlled release of nutrients and selected from the following list: montmorillonite, granulated montmorillonite, lignin containing alkaline lignin and lignosulfonate, the content of these materials, providing controlled release of nutrients, ranging from 3% to 35% by weight (based on dry weight of the aqueous slurry of ammonium phosphate);

mixing the aqueous slurry of ammonium phosphate added materials, providing controlled release of nutrients, until a homogeneous mixture;

thickening of the mixture of the aqueous slurry of ammonium phosphate and materials, providing a controlled release of nutrients, to reduce water content in the mixture to 25-35% by weight (RA is read based on the dry weight of the aqueous slurry of ammonium phosphate), and

granulating the condensed mixture of the aqueous slurry of ammonium phosphate and materials, providing a controlled release of nutrients, to obtain granulated fertilizers based on ammonium phosphate with controlled release of nutrients.

2. The method according to claim 1, in which a mixture of ammonium phosphate and materials, providing a controlled release of nutrients, additionally add sulfuric acid for acidification of the mixture prior to its thickening, while sulfuric acid is added in an amount of from 1 to 20% by weight (based on dry weight of the aqueous slurry of ammonium phosphate).

3. The method according to claim 1, wherein the granulating process is chosen from the following list: granulation of the slurry, spray granulation, fluidized bed granulation.

4. The method of producing fertilizer based on ammonium phosphate with controlled release of nutrients, including the following:

adding to the powder of ammonium phosphate water and at least one or more materials that provide controlled release of nutrients and selected from the following list: montmorillonite, granulated montmorillonite, lignin containing alkaline lignin and lignosulfonate, the content of these materials, ensuring asiausa controlled release of nutrients, is from 3 to 35% by weight (calculated on dry weight basis of one of a slurry of ammonium phosphate);

mixing powder of ammonium phosphate added materials, providing controlled release of nutrients, and water until a homogeneous mixture;

grinding the mixture;

activation of components of the mixture by stacking together and

drying the activated mixture to obtain fertilizers based on ammonium phosphate with controlled release of nutrients.

5. The method according to claim 4, in which a mixture of ammonium phosphate and material providing a controlled release of nutrients, additionally add sulfuric acid for acidification of the mixture before grinding, while sulfuric acid is added in an amount of from 1 to 20% by weight (based on dry weight of the aqueous slurry of ammonium phosphate).

6. The method according to claim 4, further comprising granulating process for obtaining granular fertilizers based on ammonium phosphate with controlled release of nutrients, the process of granulation choose from the following list: granulation of the slurry, spray granulation, fluidized bed granulation.

7. The method of producing fertilizer based on ammonium phosphate with controlled visvobodi is receiving nutrients includes the following operations:

adding to the aqueous slurry of ammonium phosphate at least one or more materials that provide controlled release of nutrients and selected from the following list: acidified zeolite, acidified montmorillonite, acidified granulated montmorillonite, acidified lignin containing acidified alkaline acidified lignin and lignosulfonate, the content of these materials, providing controlled release of nutrients, ranging from 3 to 35% by weight (based on dry weight of the aqueous slurry of ammonium phosphate);

mixing the aqueous slurry of ammonium phosphate added materials, providing controlled release of nutrients, until a homogeneous mixture;

thickening of the mixture of the aqueous slurry of ammonium phosphate and materials, providing a controlled release of nutrients, to reduce water content in the mixture to 25-35% by weight (based on dry weight of the aqueous slurry of ammonium phosphate) and

granulating the condensed mixture of the aqueous slurry of ammonium phosphate and materials, providing a controlled release of nutrients, to obtain a granulated fertilizer on the basis of phosphate is ammonium controlled release of nutrients.

8. The method according to claim 7, in which a mixture of ammonium phosphate and material providing a controlled release of nutrients, additionally add sulfuric acid for acidification of the mixture before thickening, and sulfuric acid is added in an amount of from 1 to 20% by weight (based on dry weight of the aqueous slurry of ammonium phosphate), the process of granulation choose from the following list: granulation of the slurry, spray granulation, fluidized bed granulation.

9. The method of producing fertilizer based on ammonium phosphate with controlled release of nutrients, including the following:

adding to the powder of ammonium phosphate water and at least one or more materials that provide controlled release of nutrients and selected from the following list: acidified zeolite, acidified montmorillonite, acidified granulated montmorillonite, acidified lignin containing acidified alkaline acidified lignin and lignosulfonate, the content of these materials, providing controlled release of nutrients, ranging from 3 to 35% by weight (based on dry weight of the aqueous slurry of ammonium phosphate);

mixing powder of ammonium phosphate with added material is aalami, providing controlled release of nutrients, and water until a homogeneous mixture;

grinding the mixture;

activation of components of the mixture by stacking together and

drying the activated mixture to obtain fertilizers based on ammonium phosphate with controlled release of nutrients.

10. The method according to claim 9, in which a mixture of ammonium phosphate and material providing a controlled release of nutrients, additionally add sulfuric acid for acidification of the mixture before grinding, and sulfuric acid is added in an amount of from 1 to 20% by weight (based on dry weight of the aqueous slurry of ammonium phosphate),

to obtain granulated fertilizers based on ammonium phosphate with controlled release of nutrients, the method further includes the process of granulation, selected from the following list: granulation of the slurry, spray granulation, fluidized bed granulation.



 

Same patents:

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3 ex

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1 ex

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EFFECT: enhanced efficiency.

3 ex

FIELD: medicine and microbiology; agriculture and food industry; methods of production of monopotassium phosphate.

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2 cl, 3 ex

FIELD: agriculture; production of mineral fertilizers.

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EFFECT: the invention ensures production of a homogenous product of improved quality, decreased power inputs and losses of ammonia in the general process.

2 cl, 3 ex

FIELD: fertilizers, chemical technology.

SUBSTANCE: invention relates to a method for preparing monoammonium phosphate used broadly as a mineral fertilizer. Method involves decomposition of phosphate with a mixture of phosphoric and sulfuric acid, separation of reaction mass with isolation of the production acid, its purifying from impurities, concentrating, ammoniation to obtain phosphate pulp and the following procedures of granulation and drying. The separated production acid is concentrated and then subjected for purification from impurities and ammoniated maintaining the content of P2O5 in the concentrated acid at these stages in the range 52-56%, the content of SO3 at the range 1.5-3.2%, the residual content of solid impurities in the cleared concentrated acid 0.2-0.6% by mass, and the mole ratio NH3 : H3PO4 in the range 1.01-1.16. Regulation of the yield for required sort of monoammonium phosphate by the content of main nutrient substances and the ratio is carried out by change of the SO3 content in dilute phosphoric acid and by change of the mole ratio NH3 : H3PO4 in the ammoniation process. Invention provides enhancing content of total sum of nutrient substances in the fertilizer and enhancing strength index of granules and their homogeneity.

EFFECT: improved preparing method.

2 cl, 4 ex

FIELD: industrial inorganic synthesis.

SUBSTANCE: invention relates to production of ammonium phosphates, notably ammophos, widely used as mineral fertilizers. Process involves neutralization of phosphoric acid with ammonia at elevated pressure, stirring of resulting mixture in static mixer, and subsequent granulation and drying of product. According to invention, neutralization is carried out in two steps: in the first step, 80-85% H3PO4 of its total amount is added and process is carried out at gauge pressure 3.5-8 atm and, in the second step, the rest of acid is added and pressure is lowered to pressure 1.5-3.0 atm. Stirring is effected simultaneously with ultrasonic treatment of the mixture with pulse power from 100 to 1000 W and, before granulation, pressure is lowered by 0.5-0.8 atm relative to pressure of the second neutralization step. Ultrasonic treatment can likewise be employed in the first neutralization step.

EFFECT: improved process control to form uniform improved-quality product and reduced ammonia emission.

2 cl, 3 ex

FIELD: mineral fertilizers.

SUBSTANCE: method of manufacturing complex granulated mineral fertilizer consists in mixing ammonium nitrate and monoammonium phosphate-containing phosphate additive. The latter is granulated mineral double fertilizer simultaneously containing ammonium nitrate, monoammonium phosphate, and calcium phosphates at total content of digestible phosphorus 13÷21% (calculated as P2O5). Additive is introduced by way of melting it followed by admixing resulting melt to molten ammonium nitrate. Phosphate additive utilizes nitroammophosphate at weight ratio N:P2O5 equal to 23:21 or 26:13 and phosphate additive melt is preliminarily completely or partly separated from infusible solid phase, after which phosphate additive is introduced in amount 2-6% (as P2O5) of the weight of final product. Granulated mineral fertilizer contains ammonium nitrate and monoammonium phosphate with total content of digestible P2O5 within a range of 2÷6%, in which case 0.4÷28.6% of P2O5 is present in the form of dicalcium phosphate.

EFFECT: reduced corrosiveness of process medium, increased nutritive value of fertilizer having physicochemical properties competitive with those of known fertilizers, and simplified manufacturing technology.

5 cl, 1 tbl, 5 ex

The invention relates to a method for producing the phosphorus-containing fertilizers such as diammonium phosphate, having a stable dark color of demand in the market
The invention relates to the technology of mineral fertilizers, namely, to obtain from the map solution of ammonium phosphate, which can be used as the phosphorus-containing component is completely water-soluble nitrogen-phosphorus-or nitrogen-phosphorus-potassium fertilizers
The invention relates to a method for producing a complex NPK fertilizers commonly used in agriculture

The invention relates to the technology of production of complex mineral fertilizers, in particular chlorine-free fertilizers by azotnokislogo decomposition of natural phosphates

FIELD: mineral fertilizers.

SUBSTANCE: method of manufacturing complex granulated mineral fertilizer consists in mixing ammonium nitrate and monoammonium phosphate-containing phosphate additive. The latter is granulated mineral double fertilizer simultaneously containing ammonium nitrate, monoammonium phosphate, and calcium phosphates at total content of digestible phosphorus 13÷21% (calculated as P2O5). Additive is introduced by way of melting it followed by admixing resulting melt to molten ammonium nitrate. Phosphate additive utilizes nitroammophosphate at weight ratio N:P2O5 equal to 23:21 or 26:13 and phosphate additive melt is preliminarily completely or partly separated from infusible solid phase, after which phosphate additive is introduced in amount 2-6% (as P2O5) of the weight of final product. Granulated mineral fertilizer contains ammonium nitrate and monoammonium phosphate with total content of digestible P2O5 within a range of 2÷6%, in which case 0.4÷28.6% of P2O5 is present in the form of dicalcium phosphate.

EFFECT: reduced corrosiveness of process medium, increased nutritive value of fertilizer having physicochemical properties competitive with those of known fertilizers, and simplified manufacturing technology.

5 cl, 1 tbl, 5 ex

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