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Method for producing urea-based compound fertilizer by high tower granulation

A compound fertilizer and high-tower granulation technology, which is applied to fertilizer forms, fertilizer mixtures, and fertilization devices, can solve problems such as difficulty in producing low-nitrogen or high-phosphorus compound fertilizers and high viscosity of slurry, and achieve energy consumption The effect of reducing, low viscosity and low energy consumption

Active Publication Date: 2012-07-18
WENGFU (GRP) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] (4) It is difficult to produce low-nitrogen or high-phosphorus compound fertilizer because the viscosity of the slurry is too high

Method used

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  • Method for producing urea-based compound fertilizer by high tower granulation
  • Method for producing urea-based compound fertilizer by high tower granulation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Add 24kg of flux ammonium nitrate and 160.9kg of urea into the urea melting tank, and melt the urea at a temperature of 117°C (the melting point of urea is 132.7°C). Other materials, containing 96kg of monoammonium phosphate, 66.7kg of potassium chloride, 52.4kg of calcium carbonate powder and return materials, mixed, the temperature of the mixed molten slurry obtained is about 102°C, and finally, the above mixed molten slurry is passed through the high tower The upper adjustable differential two-speed rotary granulation nozzle sprays into the granulation tower, and the granulation is completed under natural ventilation and cooling. The prepared compound fertilizer contains 23.1% N, P 2 o 5 12.2%, K 2 O is 10.0%, and all indicators are in line with GB15063-2001.

Embodiment 2

[0028] Add 20kg of flux ammonium nitrate and 152.7kg of urea into the urea melting tank, melt the urea at a temperature of 119°C, and the melted urea flows into the mixing reaction tank at the top of the tower after metering, and add other materials in the mixing reaction tank, including phosphoric acid Ammonium monoammonium 118.2g, potassium chloride 53.3g, calcium carbonate powder 56.2g and return material, mix, the temperature that obtains mixed molten slurry is about 110 ℃, finally, above-mentioned mixed molten slurry is passed through the adjustable The differential two-speed rotating granulation nozzle sprays into the granulation tower, and the granulation is completed under natural ventilation and cooling. The prepared compound fertilizer contains 21.9% N, P 2 o 5 15.1%, K 2 O is 7.9%, and all indicators are in line with GB15063-2001.

Embodiment 3

[0030] Add 32kg of flux ammonium phosphorus nitrate and 137.0kg of urea into the urea melting tank, and melt the urea at a temperature of 116°C. Ammonium monoammonium 38.2g, potassium sulfate 152g, calcium carbonate powder 40.7g and return materials, mixed, the temperature of the mixed molten slurry obtained is about 107°C, and finally, the above mixed molten slurry is passed through the adjustable differential in the middle and upper part of the tower. The two-speed rotating granulation nozzle sprays into the granulation tower, and the granulation is completed under natural ventilation and cooling. The prepared compound fertilizer contains 19.1% N, P 2 o 5 5.0%, K 2 O is 19.2%, and all indicators are in line with GB15063-2001.

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Abstract

The invention discloses a method for producing a urea-based compound fertilizer by high tower granulation. The method comprises the following steps of: (1) adding a fluxing agent and urea into a melting tank, melting the urea at low temperature, and adding into a mixing reaction tank on the top of a tower; (2) adding other raw materials into the melted urea solution in the mixing reaction tank on the top of the tower, and mixing and stirring to obtain mixed and melted slurry; and (3) spraying the mixed and melted slurry by using a granulation nozzle in the high tower, and granulating in the tower. The method has the advantages that operating temperature and energy consumption are low, the liquidity of the slurry is high, a few bubbles exist in the mixed slurry, a small amount of biuret is generated, the operating environment is good, and the like; and high tower granulation production can be stably, normally and continuously performed.

Description

technical field [0001] The invention relates to a method for manufacturing urea-based compound fertilizers, in particular to a method for producing urea-based compound fertilizers through high-tower granulation by using a flux to lower the melting temperature of urea. Background technique [0002] The main principle of high-tower granulation to produce urea-based compound fertilizer is to add monoammonium phosphate, potassium fertilizer (such as potassium chloride, potassium sulfate) and auxiliary materials to the molten urea solution and mix evenly to make a fertilizer slurry with good fluidity. It is sprayed through the granulation nozzle on the top of the tower, cooled and solidified into granules in the air, and the compound fertilizer with uniform nutrient distribution and good granule shape can be obtained. The fertilizer is favored by users due to its advantages of uniform nutrient, high fertilizer efficiency, good water solubility, and better performance than other...

Claims

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Application Information

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IPC IPC(8): C05G1/00C05G5/00
Inventor 何浩明刘旭胡宏杨三可解田黄吉林
Owner WENGFU (GRP) CO LTD
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