Method of conditioning of the granulated fertilizers

FIELD: agriculture; chemical industry; other industries; methods of conditioning of the granulated fertilizers.

SUBSTANCE: the invention is pertaining to the technology of production of the mineralfertilizers with the improved physical properties slowly variable at transportations and storing. For mitigation of the blocking property of the fertilizers the granules after cooling are coated with the conditioning additivess in the separate apparatus. The method includes granulation of the pulp of ammonium phosphates, drying of the granules, their cooling with introduction at this stage by the sprinkling method of the liquid conditioning additives in the section with the temperature of the layer exceeding by 5-10°С the temperature of the being cooled product. The fluid additive is injected several times distributing it across the section of sprinkling in the form of drips with the varying dimensions. The dimension of the drips change within the limits of ddr/dgr equal to (0.05-0.15): 1). At that the dimension of the drips is increasing with the increase of the difference of the temperatures of the additive and the layer of the granules in the place of the injection. The temperature of the liquid additive is kept within the limits of 70-90°С. The treated granules of the fertilizer have obtained the qualitative coating reducing the blocking property of the fertilizer.

EFFECT: theinvention ensures, that the treated granules of the fertilizer have obtained the qualitative coating reducing the blocking property of the fertilizer.

2 cl, 2 ex

 

The invention relates to the technology of production of mineral fertilizers with improved physical properties, slowly changing during transportation and storage. In particular, to reduce caking of the fertilizer granules after cooling, cover the conditioning additives in a separate apparatus.

The disadvantage of this method is the uneven coating of the granules, because on a cold product of the spreading of liquid on the surface of the granules is difficult, which leads to an increase caking of the product. With a significant increase in the irrigation of the fluid flow from the pellets and sticks to the internal arrangement of the apparatus, which reduces the reliability of his work.

There is also known a method of applying a conditioning additive granules in the apparatus with fluidized bed at a temperature of layer 75°when this temperature is drying and curing the coating substances (Pavlasek, Iggeres "Major processes of mineral fertilizers, M.: Chemistry, 1990, s-239).

The disadvantages of this method are the need for drying or polymerization modifier fluid and, as a consequence, the limited range of additives used. It also requires additional energy consumption for the process of drying and curing.

The closest to describing the technical essence and d is evil in the result is a method of obtaining air-conditioned granular fertilizers, containing ammonium phosphates, including granulating the slurry of ammonium phosphates, drying the granules, cooling them with the introduction of this stage of conditioning liquid additives into a zone with a temperature exceeding 5-10°With the temperature of the cooled product. According to this method, the liquid additive is supplied to the zone temperature of the pellets at once.

The carrying out of the method thus leads to increased costs of conditioning additives associated with the merger of its pores of the granules. So, for example, to map the flow rate of the additive (oil) is 2.5 kg/so reducing the number of additives coated granules obtained uneven and fragile, leading to increased caking (RF Patent No. 2258054, 05G 3/10, 2005).

The task was improved in such a way as to obtain granules with high-quality surface coating while reducing the consumption of supplements.

The problem is solved in the proposed method of obtaining air-conditioned granular fertilizers containing ammonium phosphates, including granulating the slurry of ammonium phosphates, drying the granules, cooling them with the introduction of this stage of conditioning liquid additives into a zone with a temperature exceeding 5-10°With the temperature of the cooled product in which the liquid additive is introduced in several stages, the distribution is I the irrigation zone in the form of droplets with varying size, moreover, the droplet size change within dcap/dGrand(0.05 to 0.15):1, on the basis of the temperature difference between the additive and the layer of granules in the introduction.

The method consists in the following. To achieve this goal it is necessary to obtain a uniform and durable coating of the granules. Is influenced by various factors: the diameter of the drops of liquid additives, the diameter of the pellets, the temperature of the additive, the temperature of the layer of granules.

As the temperature of the layer of granules is changed in the course of passage through the area, it is advisable to apply a liquid additive portions in several places at the same time in each place to submit it in the form of droplets of different sizes (diameter).

Multi-stage introduction of the additive in the form of droplets of various sizes allows you to first apply small drops, and after cool down and commit to fix on them the primary coating layer, thereby eliminating the runoff of large droplets at the nozzle apparatus. This achieves a uniform coating of the granules without loss condition additives and frequent stops of the apparatus for cleaning.

It was found that, the larger the temperature difference between the additive and the layer of granules in the area of irrigation (Δt), the greater must be the size of the droplets. This is because with increase Δt increasing the cooling rate, i.e. thickening fluid. Therefore, to ensure uniform Rast is Chania liquid on the surface of the granules drop must be large enough. Decreasing Δt the droplet size should be reduced.

The absolute value of the drops depends on the size of the granules. With respect to the droplet size to the diameter (dcap/dGrand) more than 0.15 is formed too thick liquid film, it is not retained on the surface of the granules and flows down from it, forming growths on the inside of the nozzle apparatus. This leads to the loss of conditioning additives and frequent shutdowns for cleaning. When dcap/dGrandless than 0.05 drops by surface tension held in the points of contact with the granules, not envelop it, and are absorbed into the pores. This also leads to an increase of the flow conditioner additives, poor uniformity, and therefore, the efficiency of the coating.

Using the proposed method allows to obtain granules with a quality coating, thereby to reduce the caking of fertilizers, at a lower flow condition additives. For example, when processing map use 2 kg of industrial oil per 1 ton of the product (prototype 2.5 kg per 1 ton of product), as can be seen from example 1, caking decreases. Also reducing downtime.

The method is illustrated by the following examples.

Example 1. 40000 kg/h granular monoammonium phosphate (product fraction) with an average diameter of 3.5 m and a temperature of 95° With serves in a rotating cooling drum, purged of atmospheric air in the number 65000 kg/h at the same time in the apparatus at two points at a distance of 3 and 1.5 m from the discharge, where the temperature of the layer is respectively 55 and 50°With pneumatic nozzles atomized industrial oil at a temperature of 75°From first in the direction of pellet injector serves 30 kg/h of oil with an average droplet size of 0.3 mm (dcap/dGrand=0,09 Δt=20°C), and the second nozzle serves 50 kg/h of oil with an average droplet size of 0.4 mm (dcap/dGrand=0.12 and Δt=25°C). The flow rate of the spray air is respectively 1 and 0.8 kg/kg unloaded From the apparatus 40080 kg/h product at a temperature of 45°C. Caking of the product 30 kPa.

Example 2. 40000 kg/h granulated ammonium nitrate (commodity fraction) with an average diameter of 3.5 mm and a temperature of 85°served in the apparatus with a fluidized bed, blown air in the number 65000 kg/h at the same time in the apparatus at three points at a distance of 3, 2.5 and 2 m from the discharge, where the temperature of the layer is respectively 55, 52 and 50°With mechanical injectors atomized industrial oil mixed with amines at a temperature of 80°From first in the direction of pellet injector serves 30 kg/h of liquid additive with an average size of Capel is 0.2 mm (d cap/dGrand=0.06 Δt=25°). The second nozzle also serves 30 kg/h additive with an average droplet size of 0.4 mm (dcap/dGrand=0.12 and Δt=28°). In the third nozzle serves 40 kg/h of the additive with an average droplet size of 0.5 mm (dcap/dGrand=0.14 and Δt=30°C). From the apparatus unload 40100 kg/h air-conditioned product at a temperature of 45°C. Caking of the product 40 kPa.

1. The method of obtaining the air-conditioned granular fertilizers containing ammonium phosphates, including granulating the slurry of ammonium phosphates, drying the granules, cooling them with the introduction of this phase liquid conditioning additives method of irrigation in the area with a temperature exceeding 5-10°With the temperature of the chilled product, wherein the liquid additive is introduced in several stages, distributing it around the area of irrigation in the form of droplets with varying sizes, which vary in the range dcap/dGrandequal (0,05-0,15):1, while the droplet size increases with increasing temperature difference between the additive and the layer of granules in the introduction.

2. The method according to claim 1, characterized in that the temperature of the liquid additive is maintained within the range of 70-90°C.



 

Same patents:

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The invention relates to the chemical industry, in particular to methods of producing a complex mineral fertilizer with micronutrients

The invention relates to fertilizers with controlled nutrient release and methods for their preparation

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The invention relates to the production of mineral fertilizers, in particular to a method for producing briquettes of complex fertilizers with a long release of nutrients

FIELD: agriculture; production of the organic-mineral long-acting fertilizers.

SUBSTANCE: the invention is pertaining to the field of agriculture, in particular, to production of the organic-mineral long-acting fertilizers on the basis of the woodworking wastes salvaging. The organic-mineral long-acting fertilizer contains the production wastes of the woodworking industry, the ash, the polishing dust, the glue-containing waste water flows, at the following ratio of the components (in mass %): woodworking industry wastes - 50 %, the polishing dust - 20 %, the ash - 10 %, the glue-containing waste water flows - 20 %. Usage of the indicated fertilizer allows to increase the crop-producing power, to improve the agro-physical properties of the soils, and also to reduce the level of pollution of the environment.

EFFECT: the invention ensures that usage of the indicated fertilizer allows to increase the soils crop-producing power, to improve their agro-physical properties, and also to reduce the level of pollution of the environment.

FIELD: agriculture; environmental methods of production of the fertilizers by salvaging of the woodworking industry wastes.

SUBSTANCE: the invention is pertaining to the field of agriculture, namely to production of the fertilizers on the basis of salvaging of the woodworking industry wastes. The method provides for stirring of the woodworking industry wastes, which preliminary have been ground, then - intermixed with the ash, the polishing dust, flooded with the glue-containing flows at the following ratio of the components (in mass %): woodworking wastes - 50 %, the polishing dust - 20 %, the ash - 10 %, the glue-containing flows - 20 %. Usage of the presented fertilizer allows to increase the crop-producing power, to improve the agrophysical properties of the soils, and also to reduce the level of pollution of the environment.

EFFECT: the invention ensures that usage of the indicated fertilizer allows to increase the soils crop-producing power, to improve their agrophysical properties, and also to reduce the level of pollution of the environment.

FIELD: agriculture.

SUBSTANCE: invention relates to agriculture composition comprising nitrogen-containing fertilizer as substrate and 0.05-1.5 mass % coating applied thereon to decrease dust forming and fertilizer conglomeration. Said coating includes conditioning agent containing wax, oil, resin, surfactant and optionally biodegradable polymer. Conditioning agent useful in fertilizer applying includes (mass %) wax 5-50; oil including vegetable oils, liquid animal fats, marine animal fats or products thereof 5-75; resin 30-60, wherein said resin represents natural resin or residue from distillation of unsaturated liquid animal fat, fish oil, or vegetable oil; surfactant 2-15; and biodegradable polymer 0-5 %. Conditioning agent is easily applied on fertilizer particles and provides flowability and simplifies transportation.

EFFECT: composition having non-toxic and environmentally friendly coating.

10 cl, 4 ex, 1 tbl, 4 dwg

FIELD: mineral fertilizers.

SUBSTANCE: invention relates to granulated mineral fertilizers containing ammonium phosphates modified by surfactants and powdering substances, which do not lose their physicochemical properties during transportation and storage. Manufacture process comprises granulation of ammonium phosphate pulp, drying of granules, sorting and selection of commercial fraction, cooling and addition of modifying supplements. The latter are added in the cooling stage into zone with bed temperature by 5-10°C exceeding temperature of cooled product. Conditioning additives utilized can be either only liquid or the same mixed with dry powdering substances.

EFFECT: improved quality of surface coverage and simplified process.

2 cl, 3 ex

The invention relates to the conditioning of mineral fertilizers by surface treatment of the conditioning composition containing primary aliphatic amines with long hydrocarbon chains WITH17-C20solid hydrocarbons with a melting point not lower than 50°C, low-molecular polyisobutylene with a molecular mass of 5000-30000, nonionic surfactant is ethoxylated amides of fatty acids and paraffin hydrocarbon fraction WITH14-C17

FIELD: agriculture, fertilizers.

SUBSTANCE: claimed method includes one-step neutralization of liquid and gas ammonia in ratio of 1:(0.25-3.0) with acidic solution having molar ratio of NH3:H3PO4 = 0.5-0.7 up to molar ratio in product of NH3:H3PO4 = 1.65-1.82, followed by product granulation and drying in single apparatus and purification of exhaust gases. Claimed ratio of liquid and gas ammonia makes it possible to control granulation process and to use reaction heat for product drying. Yield of commercial fraction (namely 2-4 mm) is 90-92 %.

EFFECT: simplified one-step process with increased yield.

5 ex, 1 dwg

FIELD: chemistry, agriculture, fertilizers.

SUBSTANCE: invention relates to method for production of complex fertilizers by decomposition of apatite concentrate with nitric acid by using low-grade phosphate raw materials are used. Claimed method includes decomposition of apatite concentrate with nitric acid, calcium nitrate isolation from nitrophosphate extract, crystallization followed by conversion thereof in ammonium nitrate; neutralization of separated nitrate-phosphate solution with ammonia, vaporization, blending of evaporated pulp with low-grade phosphate raw materials, ammonium nitrate and potassium salt; granulation and drying of finished product. According to this invention low-grade phosphate raw materials are preliminary treated with conversion ammonium nitrate solution at S:L = 1:1-3 to produce in slurry ratio of P2O5digestible:P2O5total = 35-45 %. PH of conversion solution is maintained preferably either 0.3-1.5 or 7.5-9, with the proviso, that when pH is 0.5-1.5 ratio of apatite and low-grade phosphate raw materials calculated as P2O5 is (1.5-3):1; and when pH is 7.5-9 abovementioned ratio is (4.2-5):1.

EFFECT: product of prolonged action, simplified process without losses of product quality.

2 cl, 1 tbl

FIELD: fertilizers, chemical technology.

SUBSTANCE: invention relates to a method for preparing granulated ammophos. Method involves neutralization of phosphoric acid with ammonia, granulation of product by pulp raising dust on the recycle particles in the presence of acid agent added in the amount necessary for providing pH value of granulated mixture 3.5-4.8 and simultaneous drying the ready product. Acid neutralizing agent is applied preliminary on the recycle granules surface at temperature 70-90°C wherein the recycle is taken with granules strength 3-8 MPa. As acid agent method involves using phosphoric and/or sulfuric acids. Invention provides increasing yield of commercial fraction 2-5 mm up to 80-90%.

EFFECT: improved preparing method.

2 cl, 1 tbl, 1 ex

FIELD: chemical industry, agriculture.

SUBSTANCE: invention relates to method for production of double NP-fertilizer containing 3-7 mass % of P2O5 from concentrated ammonium nitrate solution and extractive phosphoric acid solution. Starting phosphoric acid (52-54 %) is diluted with weak ammonium nitrate solution, diluted solution is additionally treated with ammonium nitrate to produce NH4NO3:P2O5 ratio in ammoniated solution not less than 3:1, wherein ammoniating is carried out simultaneously with auxiliary treatment or thereafter. Ammoniated solution is boiled down to produce residual water content of 5-20 mass % and mixed with concentrated ammonium nitrate solution. Then obtained solution is finally neutralized with ammonia, boiled down and grained. Phosphorous content in ammoniated solution is maintained preferably from 4 to 10 mass % calculated as P2O5, and as ammonium nitrate in auxiliary treatment of diluted solution preferably concentrated ammonium nitrate solution obtained by nitric acid neutralization with ammonia or 40-50 % solution obtained by conversion of calcium nitrate with ammonium carbonate is used.

EFFECT: simplified method for production of complex nitrogen-phosphorous fertilizer.

5 cl, 3 ex

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

FIELD: chemical industry.

SUBSTANCE: method comprises neutralizing phosphate acid by ammonium, granulating, drying the product in the drum granulator-dryer, classifying granules, and cooling the finished product in a fluidized bed, with supplying ammonium for neutralizing in amount that exceeds the value required for the product by 0.2-0.5% (on conversion to nitrogen). The finished product is cooled under the rarefication of 300-600 mm Hg, and the fluidized bed is blown by the atmospheric air produced in the rarefication.

EFFECT: enhanced efficiency.

3 ex

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

SUBSTANCE: the invention is pertaining to production of monopotassium phosphate used as fertilizers, food additives, and also in medicine and microbiology. The method provides for neutralization of phosphoric acid by potassium carbonate up to pH not above 4.5 at the heightened temperature, separation of the produced admixture by filtration with the subsequent crystallization and separation of the finished product at cooling. Potassium carbonate take in the form of a water solution with the concentration necessary for production in the neutralized mixture of 23-30 % monopotassium phosphate. The neutralization process is conducted at the temperature of 70-78°C, and the mother liquor after separation of the finished product at the stage of a crystallization return into the process on the stage of dissolution of potassium carbonate. Reaction of the neutralization conduct up to pH = 3.8-4.5. The technical result is an increase of output of the finished product up to 95-97 % and creation of the wasteless production due to utilization of a mother liquor in the process.

EFFECT: the invention ensures increased output of the finished product up to 95-97 %, creation of the wasteless production due to utilization of a mother liquor in the process.

2 cl, 3 ex

FIELD: agriculture; production of mineral fertilizers.

SUBSTANCE: the invention is pertaining to production of ammonium phosphates, in particular, diammonium phosphate widely used in agriculture as mineral fertilizers. The method includes neutralization of phosphoric acid by ammonia at an increased pressure, a stirring action of the produced mixture in a static mixer with its subsequent granulation and drying of the product. Neutralization is conducted in two stages: on the first of which feed 8 - 85 % of ammonia from total amount and the process is conducted under the pressure of 3.5 - 8.0 atm, and on the second stage feed the remained amount of ammonia and reduce pressure to 1.5 - 3.0 atm. At that the stirring action is carried on simultaneously with a treatment of the mixture with ultrasound with a pulse power from 100 up to 1000 W. Before granulation additionally reduce the pressure by 0.5 - 0.8 atm as compared with the pressure of the second stage of neutralization. Ultrasonic treatment additionally conduct and on the first stage of neutralization. The technical result is production of a homogenous product of improved quality, decreased power inputs and losses of ammonia in the general process.

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

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