Method for production of complex nitrogen-phosphorous fertilizer

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

 

The invention relates to methods for complex nitrogen-phosphorus fertilizers based on ammonium nitrate and phosphoric acid, and may find application in the chemical industry for the production of dual NP-fertilizers with the content of P2About53-7%.

A method of obtaining complex nitrogen-phosphorus fertilizer by neutralizing nitric acid with the addition of phosphorous acid based 3-5 kg P2About51 t of the target product, parki neutralized solution and granulation of the melt to obtain the desired product containing 0.3 to 0.5% R2About5[Production of ammonium nitrate in units of large capacity. Edited Vmelilo, 2nd ed, M., Chemistry, 1990, s-164]. The disadvantage of this method is the low content of P2About5in the fertilizer that devalues its consumer properties.

The closest to the essential features and the result achieved by the present invention is a method of obtaining a complex nitrogen-phosphorus fertilizer from the concentrated ammonium nitrate (89-92%) and phosphoric acid with a concentration of 52-54% in terms of P2O5including the dilution of the original wet-process phosphoric acid with a weak solution of ammonium nitrate to the concentration of 30-42% in recalculation of the P 2About5, ammonization dilute solution at a temperature of 110-150°C, the mixture AMMONIATING solution with a concentrated solution of ammonium nitrate, Donatello received nitrate-phosphate solution to a pH of 4-5, oparka and granulation Plava about obtaining the target product with a phosphorus content within 4-7 wt.% in terms of R2About5[Pat. Of the Russian Federation No. 2171795, IPC 7 05 7/00, 05 With 1/00, publ. 10.08.2001 g].

The disadvantage of this method is the complexity of the implementation process, due to frequent zabawkami heat exchangers phosphates of iron and aluminum and the need for it to be off from work for leaching. The probable cause of zabivac equipment is that impurities of iron and aluminum present in the wet-process phosphoric acid, when it ammonization in conditions known way to form a connection that has a high tendency to form dense deposits on heat transfer surfaces in the evaporation process.

The technical problem solved by the claimed method, is to simplify the process by reducing the probability of zabivac heat transfer equipment.

The technical problem is solved in that in the method of obtaining complex nitrogen-phosphorus fertilizer from the concentrated RA the creators of ammonium nitrate and phosphoric acid, including the dilution of the original wet-process phosphoric acid with a weak solution of ammonium nitrate, ammonization dilute solution, the mixture AMMONIATING solution with a concentrated solution of ammonium nitrate, Donatello received nitrate-phosphate solution, oparka and granulation of the melt, according to the invention diluted solution is further treated with ammonium nitrate to achieve a ratio of NH4NO3:P2O5in immunizirovannam the solution is not less than 3:1 and the last before mixing with the concentrated solution of ammonium nitrate evaporated to a residual water content of 5-20 wt.%.

The phosphorus content in immunizirovannam solution support preferably in the range of 4-10 wt.% in terms of R2About5.

For additional processing dilute solution as ammonium nitrate used is preferably a concentrated solution of ammonium nitrate, obtained by neutralizing nitric acid with ammonia, or 40-50%solution obtained by the conversion of calcium nitrate with ammonium carbonate, and processing AMMONIATING solution of ammonium nitrate is carried out before or simultaneously with the ammonization.

Example 1

Wet-process phosphoric acid with a concentration of 52% in terms of P2O5taken in a quantity of 50 g, diluted with 15%-n is m solution of ammonium nitrate, taken in the amount of 170 g of the Obtained diluted solution is treated with stirring for 15 min, concentrated (90%) solution of ammonium nitrate with a pH of 1.5 obtained in the current production of ammonium nitrate by neutralizing nitric acid with ammonia, taken in an amount of 160 g, and ammonition gaseous ammonia to a pH of 4.5. The ratio of NH4NO3:P2About5in immunizirovannam solution of 6.5:1, the content of P2About5of 6.7%. Ammoniaand the solution is evaporated in a glass of steel 12X18H10T to a residual water content of 9 wt.%. One stripped off the solution discharged from a glass, mix with 485 g of concentrated (90%) solution of ammonium nitrate with a pH of 1.5, selected in the current production of ammonium nitrate. Received nitrate-phosphate solution donatelifeut ammonia to pH 5.5 and evaporated in a glass of steel 12X18H10T to anhydrous melt, the melt being unloaded from a glass and granularit in a laboratory setup with obtaining the target product containing 33.5% nitrogen, 4% R2About5and 0.2% water. The strength of the pellet crush strength 3 kg granule, pH 10%solution of 5.0.

When unloading one stripped off mud and water from a glass to visually assess the condition of the inner surface of the glass. In both cases, visible deposits are absent.

Example 2

Conduct a series of similar experiments in which, changing the flow of components that support the ratio of NH4NO3:P2About5in immunizirovannam solution within 5-10:1, the content of P2About5in it within 4-10 wt.%, for processing dilute solution as ammonium nitrate used 88-92%solution of ammonium nitrate or 40-50%solution obtained in the current production of complex fertilizers on nitrogen-acid technology by the conversion of calcium nitrate with ammonium carbonate, and the above processing is carried out before ammonization or simultaneously with it. You get a complex nitrogen-phosphorus fertilizer with a nitrogen content within 32,6-33.8% - P2About5within 3-6%.

Visual inspection of the inner surface of the glass steel 12X18H10T during unloading from him one stripped off mud and water showed that visible deposits in all experiments are missing.

Example 3

Spend the experience of the prototype. For this purpose, 50 g of wet-process phosphoric acid with a content of P2About552% diluted with 15%solution of ammonium nitrate, taken in an amount of 15 g of the Diluted solution ammonition to pH 4.5. Ammoniaand solution is mixed with 670 g of concentrated (90%) solution of ammonium nitrate with a pH of 1.5, selected in the current production of ammonium nitrate; nitrate-phosphate solution donatelifeut ammonia to p is 5.0 and evaporated in a glass of steel 12X18H10T to anhydrous melt. The melt discharged from the beaker and granularit in a laboratory setup with obtaining the target product containing 33.5% nitrogen and 4% R2About5.

When viewed from the inner surface of the glass after unloading from him Plava noted the presence of dense white bloom sludge, which is not removed in washing glass of water.

From the presented data it follows that the proposed method is compared with the prototype allows to decrease the probability of the formation of deposits on heat transfer surfaces, and therefore, zabivac heat transfer equipment and it stops for leaching, i.e. to simplify the technological process.

A positive effect is achieved by the combination of the main distinguishing characteristics, providing the conditions of ammonization wet-process phosphoric acid in which impurities of iron and aluminum form a stable connection, not otlichayushiesya on heat transfer surfaces.

The minimum allowable ratio of NH4NO3:P2O5in immunizirovannam solution is 3:1. With a smaller ratio formed less stable compounds, resulting in deposits.

The valid interval of the residual water content in one stripped off immunizirovannam the solution is 5-20 wt.%. When deeper Parke on the heat transfer surface of the crystal is isoamsa monoammonium phosphate. The upper limit is determined by economic considerations: when the residual water content of more than 20% increases the strain on the water on the main stage of parki, which will lead to poor performance of industrial units.

The interval content of P2About5in immunizirovannam solution equal to 4-10%, is defined by the technological feasibility: when the content of P2About5less than 4% of unnecessarily increases the load on the water when Parke AMMONIATING solution that will cause difficulties for the organization of an industrial process, and when the content of P2About5more than 10% compounded ensuring optimum ratio of NH4NO3:P2O5in immunizirovannam solution.

For processing dilute solution as ammonium nitrate can be used technological solutions existing facilities: 88-92%solution obtained by neutralizing nitric acid with ammonia, or 40-50%solution, which is one of the products of conversion of calcium nitrate with ammonium carbonate. In the latter case, 40-50%solution can serve as both a diluent 52-54%phosphoric acid and a source of ammonium nitrate for additional processing.

Processing dilute solution of ammonium nitrate can be performed separately or is obestity process ammonization.

1. The method of obtaining complex nitrogen-phosphorus fertilizer from a concentrated solution of ammonium nitrate and phosphoric acid, including dilution of the original wet-process phosphoric acid with a weak solution of ammonium nitrate, ammonization dilute solution, the mixture AMMONIATING solution with a concentrated solution of ammonium nitrate, Donatello received nitrate-phosphate solution, oparka and granulation of the melt, characterized in that the diluted solution is further treated with ammonium nitrate to achieve a ratio of NH4NO3:P2O5in immunizirovannam the solution is not less than 3:1 and the last before mixing with the concentrated solution of ammonium nitrate evaporated to a residual water content of 5-20 wt.%.

2. The method according to claim 1, characterized in that the phosphorus content in immunizirovannam the solution is maintained within the range of 4-10 wt.% in terms of R2O5.

3. The method according to claim 1 or 2, characterized in that for additional processing dilute solution as ammonium nitrate use a concentrated solution of ammonium nitrate, obtained by neutralizing nitric acid with ammonia.

4. The method according to claim 1 or 2, characterized in that for additional processing dilute solution as ammonium nitrate using 0-50%solution, obtained by the conversion of calcium nitrate with ammonium carbonate.

5. The method according to one of claims 1 to 4, characterized in that the additional processing dilute solution of ammonium nitrate is carried out before or simultaneously with the ammonization.



 

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FIELD: agriculture, fertilizers.

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EFFECT: improved preparing method.

2 cl, 3 ex

FIELD: mineral fertilizers, chemical technology.

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FIELD: chemical industry; a method and a device for production of ammonium nitrate.

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3 ex

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2 cl, 3 ex

FIELD: mineral fertilizers.

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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
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The invention relates to a method for producing a complex NPK fertilizers commonly used in agriculture

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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