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Process for preparing complex fertilizer using sulfuric acid and ammine as partial raw material

A compound fertilizer and raw material technology, applied in the direction of ammonium orthophosphate fertilizer, alkaline orthophosphate fertilizer, fertilizer form, etc., can solve the problems of serious ammonia loss, high reaction heat, equipment corrosion, etc., and achieve reduction of ammonia consumption and utilization rate The effect of improving and saving energy consumption

Active Publication Date: 2008-10-15
SHANGHAI RES INST OF CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The second process is similar to the tubular reactor process of ammonium phosphate production, but the reaction between sulfuric acid and ammonia is more violent, the heat of reaction is greater, and the corrosion of equipment is more serious, and the reaction tube needs to be replaced frequently
In addition, due to the addition of water, the flash evaporation of water at the outlet end of the nozzle takes away a lot of heat, and part of the water entering the granulation layer also limits the operating range, and because the generated slurry is directly sprayed from the end of the pipe, the loss of ammonia also more serious

Method used

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  • Process for preparing complex fertilizer using sulfuric acid and ammine as partial raw material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] process such as figure 1 Shown:

[0027] The composition of raw materials into the system is as follows:

[0028] Urea (N: 46%)

4.634

t / h

Monoammonium (N: 10%P 2 o 5 :50%)

2.842

t / h

Potassium Chloride (K 2 O>60%)

4.718

t / h

Sulfuric acid (93%)

1.288

t / h

NH 3

0.532

t / h

filler

0.14

t / h

[0029] Product specification: N-P 2 o 5 -K 2 O=20-10-20

[0030] Hourly product output: 14 tons / hour

[0031] Reactor temperature: 60~90℃

[0032] Granulation material temperature: ~65°C

[0033] Moisture content of granulation material: ~2.5%

[0034] Return material quantity: ~10 tons / hour.

Embodiment 2

[0036] The process flow of this embodiment is as figure 1 shown, but omitting the drying step:

[0037] The composition of raw materials into the system is as follows:

[0038] Urea (N: 46%)

1.26

t / h

Ammonium Phosphate (N: 11%P 2 o 5 : 44%)

4.844

t / h

[0039] Potassium Chloride (K 2 O>60%)

3.556

t / h

Ammonium chloride (N: 23%)

2.436

t / h

NH 3

0.56

t / h

Sulfuric acid (93%)

1.75

t / h

[0040] Product specification: N-P 2 o 5 -K 2 O=15-15-15

[0041] Hourly product output: 14 tons / hour

[0042] Reactor temperature: 60~90℃

[0043] Granulation material temperature: ~75°C

[0044] Moisture content of granulation material: ~2.0%

[0045] The amount of returned materials: ~7 tons / hour.

Embodiment 3

[0047] Please refer to figure 1 First, ammonium phosphate and 80% sulfuric acid are prepared into ammonium phosphate and phosphoric acid slurry. The amount of sulfuric acid added is 30 kilograms per ton of product. Part of ammonia can also be added but the fluidity of the slurry must be maintained. Then the slurry is sprayed on the material bed in the granulator, and the phosphoric acid in the slurry is neutralized with the ammonia sprayed from the ammonia spray pipe buried in the material bed. The amount of ammonia added is 20 kg per ton of product. At the same time, it is mixed and granulated, and then dried, cooled and sieved to obtain the finished compound fertilizer.

[0048] Most of the raw materials for the production of compound fertilizers contain ammonium phosphate, which is a mixture of monoammonium phosphate and diammonium phosphate, and also contains some iron, aluminum, and magnesium impurities.

[0049] Ammonium sulfate itself is one of the components of compou...

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Abstract

The invention relates to a method which takes sulfuric acid and ammonia as partial materials to produce a compound fertilizer; the method arranges raw materials used in the production of the compound fertilizer into a reactor, and the sulfuric acid is added for reaction, thereby generating ammonium sulphate phosphate and phosphoric acid slurry, wherein, the raw materials contain phosphorus elements, and the addition amount of the sulfuric acid is 30 to 150 kilograms per ton of products; then, the ammonium sulphate phosphate and the phosphoric acid slurry are sprayed on a material bed in a granulator, so as to be mixed and granulated with other solid materials and return products, and then the ammonia is used for neutralizing phosphoric acid therein into ammonium phosphate, wherein, the addition amount of the ammonia is 20 to 80 kilograms per ton of products; furthermore, all materials are simultaneously mixed and granulated, and are cooled and screened to obtain the compound fertilizer product. Compared with the prior art, the method has the advantages that the side reactions of the sulfuric acid and other materials in the compound fertilizer such as potassium chloride, ammonium chloride, etc. can be effectively prevented, the heat discharged from the reaction is utilized to the greatest extent, the temperature of the granulating material is increased, and the water content required by the particle formation of the granulating material is reduced.

Description

technical field [0001] The invention relates to a method for producing compound fertilizer, in particular to a method for producing compound fertilizer by using sulfuric acid and ammonia as part of raw materials. Background technique [0002] Due to the decrease in the production cost of sulfuric acid, the unit nutrient price of ammonia is much lower than that of urea, and the heat released from the neutralization reaction of sulfuric acid and ammonia can greatly increase the temperature of the material, and the generated ammonium sulfate can also help the granulation process, so At present, the process of using sulfuric acid and ammonia as part of the raw materials to produce compound fertilizers is becoming more and more common. There are generally two kinds of production processes at present: one is to spray sulfuric acid directly on the material bed in the granulator, ammonia enters the material layer through the nozzle buried in the material layer, and the sulfuric acid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G1/00C05C3/00C05B7/00C05G5/00
Inventor 段立松朱东明杨焕银吴爱国张伟邱可伸陈杲
Owner SHANGHAI RES INST OF CHEM IND
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