A method of obtaining compound fertilizer

 

(57) Abstract:

The invention relates to a method for producing a complex NPK fertilizers commonly used in agriculture. The method includes the neutralization of ammonia with a mixture of phosphoric and sulphuric acids to produce phosphate slurry, the introduction of a potassium component, granulation and drying of the product at the same time as phosphoric acid is used neoprene phosphoric acid, sulphuric acid is administered in amount of 0.2-0.5 t to 1 t R2ABOUT5and ammonia to neutralize served in the quantity necessary to achieve in the finished product molar relationships NH3:H3RHO4equal to 1,0-1,5 received phosphate slurry is mixed with potassium component, then the product mixture with a humidity of 20-60% is directed to the granulation and drying, the process of granulation and drying are conducted simultaneously. As a potassium component, use potassium chloride or potassium sulfate. The method allows to reduce energy consumption, to improve the quality of complex fertilizers, reduce the Miscibility of fertilizers to increase the yield of marketable fractions. 1 C.p. f-crystals.

The invention relates to a method for producing a complex NPK fertilizers commonly used in the Soi and sulfuric acid with potassium salts followed by ammonization mixture to a pH of 4-4,5, its cooling and separation of the crystalline product. To reduce caking of the finished product in the acid mixture is injected surfactant.

The disadvantages of this method are the complexity and the multi-stage process, its duration, the need for the introduction of surfactants to enhance the physical properties of fertilizers, the unbalance of fertilizer components and low nutrient content. (Ed. the certificate of the USSR No. 707901 class. C 05 G 3/06 1980)

The closest to describing the technical essence and the achieved result is a method for NPK-fertilizers (for example, Dimovski), including the neutralization of ammonia with a mixture of phosphoric and sulphuric acids to produce phosphate slurry, the introduction of a potassium component, granulation and drying of the product. (Babkin centuries, Brodsky A. Phosphate fertilizers in Russia. - M.: Margus, 1995, S. 228, 235-238).

By this method using concentrated phosphoric acid in a concentration of 52% (see table.4.18 references S. 228). Sulfuric acid is added to the number 0,165 t 1 t P2O5. The resulting mixture is neutralized with ammonia and the resulting phosphate slurry with a molar ratio of NH3:H3RHO4equal 1,40-1,45, and the holder of the tour, and ammonia. Daemonization lead to the Maltese order of 1.70 or higher, and then the product enters into the drying drum. The result is a product mark 9:25:25 (P2O5General 25-26%, N 9-10%, K2O - 25-26%).

The disadvantage of this method is:

- use for one stripped off production of phosphoric acid that determines the presence of the evaporator, and therefore leads not only to increasing energy consumption, but also to the selection of fluorine compounds in the gas phase and their disposal, which greatly complicates and increases the cost of the process.

- Conducting daemonization to obtain the necessary brand fertilizers m og NH3:H3RHO4bring to a 1.7-1.85 to that associated with high emissions of ammonia; increased energy consumption for the recycling of ammonia, as well as the need to reinforce the flue gas cleaning systems.

- Low quality of the finished product (the porosity of the granules, the tendency of the product to caking).

Low yield.

We were set a task: create a method of obtaining complex NPK fertilizers, which can eliminate the above disadvantages and to obtain fertilizer practically the same brand.

Put senoi of acids to produce phosphate slurry with the introduction of potassium component, granulation and drying of the product. According to this method as phosphoric acid is used neoprene phosphoric acid, sulphuric acid is administered in amount of 0.2-0.5 t to 1 t P2O5ammonia to neutralize enter in the quantity necessary to achieve in the finished product NH3:H3RHO4equal to 1.0 to 1.5; the resulting phosphate slurry is mixed with potassium component, then the product mixture with a humidity of 20-60% serves on granulation and drying, the process of granulation and drying are conducted simultaneously.

As potassium compounds can be used potassium chloride or potassium sulfate.

The method consists in the following. As is known, the main problem encountered in the design of technology-based ammonium phosphates and potash component is the problem of obtaining high-quality pellets for brands with a high content of potassium component, since the complicated process of granulometry, he becomes more sensitive to changes in humidity and acidity. The yield of fraction 1-2 mm high enough (38-45%), after screening a part of this faction return as reture that leads to the accumulation of Remora and stop mponent by dissolving potassium salts in phosphate slurry enables you to evenly distribute potassium in the mixture, coming to granulation. In the process of mixing take place exchange reactions to form compounds such as potassium dihydrophosphate, kaliumnitrat and others, which can significantly improve the quality of the product, to get more durable and crystalline non-caking of the granules. The process of granulation and drying at the same time allowed the use of a drum granulator-dryer - BGS, blagoje which is much higher. This allows you to apply for granulating and drying the slurry with high humidity, i.e., more mobile, easier to transport and allows you to more evenly apply it on the veil retur therefore increases the strength of the granules, their homogeneity. The finished product is virtually no caking. In addition, BGS reduces returnest process, and therefore, reduce the cost of creating classification systems.

All of the above defined limits humidity phosphate-potash slurry in 20-60%. Humidity 20% due to marginal rheological properties that determine the ability of the transportation of the slurry and then applying it to the veil reture in BGS. The moisture content of the pulp 60% due to the fact that at higher moisture proslavama “phosphate-sulfate” mode: increasing the amount of sulfuric acid (calculated at P2O5in the mixture) and reducing the amount of typing to neutralize ammonia, on the one hand, reduces the emissions of ammonia, on the other hand, allows to obtain a product of the same model as in the prototype, without an additional daemonization product.

The method is illustrated by the following examples:

Example 1. 21,2 t neoprenes phosphoric acid with a content of P2O527%, the diluted absorption sewage, and 2.3 tons of 92.5% sulfuric acid (input standard sulfuric acid is 0.37 t H2SO4/t P2O5neutralized in speed ammoniator-evaporator (AIS) to the molar relationships NH3:H3RHO4=1,3. The resulting slurry is mixed with 10,0 tons of potassium chloride and subjected to intensive mixing. Further phosphate-potash slurry humidity 30% are served in the apparatus BGS, where they perform granulation and drying the granules. After granulation, combined with drying, receive the finished product NPK, in which the molar ratio of NH3:H3RHO4=1,3, number 25 so the strength of the granules is 8 MPa. Brand fertilizers 9:24:24. The quantity of finished product 2-5 mm - 98%. The fraction 1-2 mm - 2%. Fertilizer is practically not deformed.

2SO4/t R2O5neutralized in a tubular reactor that is installed on the tank, up to a molar relationships NH3:H3RHO4=1,3. The resulting slurry is mixed with 9,3 tons of potassium sulfate and subjected to intensive mixing. Further phosphate-potash slurry humidity 35% served in the apparatus BGS, where they perform granulation and drying the granules. After granulation, combined with drying, get a finished product with a molar ratio of NH3:H3RHO4=1,3, not containing chlorine. Quantity - 20 tons Brand fertilizers 8:24:24. The strength of the granules is 8mpa. Output fractions 2-5 mm - 98%, the fraction 1-2 mm - 2%. Fertilizer is practically not deformed.

Example 3. 14.4 tons neoprenes phosphoric acid with a content of P2ABOUT525% diluted absorption sewage, and 1.7 tons of 92.5% sulfuric acid (input standard sulfuric acid is 0.45 t H2SO4/t R2O5neutralized in speed ammoniator-evaporator (AIS) to the molar relationships NH3:H3RHO4=1,0. The resulting slurry is mixed with 6.0 tonnes of potassium chloride and subjected to intensive mixing. Further phosphate-potash Gscas, get 10 tons of finished product - NPK mark 8:24:24, the strength of the granules is 8 MPa. Output fractions 2-5 mm - 98%, the fraction 1-2 mm - 2%. Fertilizer is practically not deformed.

Example 4. 18,0 t neoprenes phosphoric acid with a content of P2O540% diluted absorption sewage, and 3.9 tons of 92.5% sulfuric acid (input standard sulfuric acid is 0.5 t2SO4/t R2O5neutralized in speed ammoniator-evaporator (AIS) to the molar relationships NH3:H3RHO4=1,5. The resulting slurry is mixed with 12.0 tonnes of potassium chloride and subjected to intensive mixing. Further phosphate-potash slurry of 20% humidity is served in the apparatus BGS, where they perform granulation and drying the granules. After granulation, the combined drying receive the finished product - NPK with a molar ratio of NH3:H3RHO4=1,5. Mark 10:24:24. The quantity of the finished product - 30 t, the strength of the granules is 8 MPa. Output fractions 2-5 mm 97%, the fraction 1-2 mm - 3%. Fertilizer is practically not deformed.

Example 5. 15,0 t neoprenes phosphoric acid with a content of P2O540% diluted absorption sewage, and 1.3 tons of 92.5% sulfuric acid (norm of woodsprite (AIS) to the molar relationships NH3: H3RHO4=1,4. The resulting slurry is mixed with 6.0 tonnes of potassium chloride and subjected to intensive mixing. Further phosphate-potash slurry humidity 30% are served in the apparatus BGS, where they perform granulation and drying the granules. After granulation, combined with drying, get complex fertilizer - NPK mark 9:26:26 in the amount of 25 tons, the molar ratio in the final product NH3:H3RHO4=1,4. The strength of the granules is 8 MPa. Output fractions 2-5 mm 97%, the fraction 1-2 mm - 3%. Fertilizer is practically not deformed.

The use of the proposed method in the industry will allow:

- get NPK-fertilizer composition: N 8-10%; P2O524-26%;2About 24-25% of neoprenes phosphoric acid containing 25-40% R2ABOUT5(and, thereby, exclude energy-consuming stage of the concentration of phosphoric acid);

- use for NPK-fertilizers technological scheme with apparatus BGS;

- reduce recycling (and the energy consumption for its organization) ammonia stages of neutralization and drying 2-5 times (by reducing the molar relationships NH3:H3RHO4in the finished product up to 1,0-1,5);

to improve quality

- 50-70% reduction in caking compound fertilizers;

to increase the yield of marketable fraction of the finished product.

1. A method of obtaining compound fertilizers, including neutralization of ammonia with a mixture of phosphoric and sulphuric acids to produce phosphate slurry, the introduction of a potassium component, granulation and drying of the product, characterized in that phosphoric acid is used neoprene phosphoric acid, sulphuric acid is administered in amount of 0.2-0.5 t to 1 t P2O5ammonia to neutralize served in the quantity necessary to achieve in the finished product molar relationships NH3:H3RHO4equal to 1.0 to 1.5, and the resulting phosphate slurry is mixed with potassium component, then the product mixture with a humidity of 20-60% is directed to the granulation and drying, the process of granulation and drying are conducted simultaneously.

2. The method according to p. 1, characterized in that as a potassium component, use potassium chloride or potassium sulfate.

 

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