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Process for producing high concentration azophoska compound fertilizer by tower type pelletizing

A high-concentration nitrogen and compound fertilizer technology, applied in the direction of fertilizer form, fertilization device, fertilizer mixture, etc., can solve the problems of low stirring efficiency, easy to form dry powder, difficult to mix, etc.

Inactive Publication Date: 2005-06-15
NINGXIA FENGYOU CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Chinese patent application "Method for Producing High-Concentration Nitrogen, Phosphorus and Potassium Compound Fertilizer by Tower Granulation" (02103008.1) discloses a method of adding nitrogen-containing and potassium-containing powder materials and auxiliary materials to urea melt, mixing and stirring to produce melt materials After the slurry is directly sent to the tower granulator for granulation, this method has the advantages of good sphericity, high yield and the ability to produce products of various specifications. However, because ① there will inevitably be large particles and other Existence of impurities, ② low stirring efficiency, the ultrafine particles (fine powder) in the powder are extremely difficult to mix with urine, and are easy to form dry powder clusters. The above reasons make the nozzles easily blocked, which affects continuous production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Take 21.0kg of monoammonium phosphate (MAP) crushed to about 60 meshes, 19.8kg of potassium chloride (KCl), calcium carbonate (CaCO 3 ) 9.7kg powder, mixed, dried and heated up, added to 49.5kg of molten urea solution, fully stirred for 5 minutes, kept the temperature of the slurry at 118°C, then sent the molten slurry into an emulsifier for emulsification, and then discharged Put it into the rotary nozzle on the top of the tower granulator, granulate and cool, the qualified particles are high-concentration NPK compound fertilizer, the product specification is: 25-10-10, the product contains 1.3% moisture, and the average particle crush resistance Force 9.4N, yield 99%.

Embodiment 2

[0012] Take 25.1kg of monoammonium phosphate (MAP) crushed to about 60 meshes, 23.8kg of potassium chloride (KCl), calcium carbonate (CaCO 3 ) 4.7kg of powder, mixed, dried and heated up, added to 46.4kg of molten urea solution, fully stirred for 8 minutes, keeping the temperature of the slurry at 118°C, then sending the molten slurry into an emulsifier for emulsification, and then The molten slurry is discharged into the rotary nozzle on the top of the tower granulator, granulated and cooled. The qualified particles are high-concentration NPK compound fertilizers. The product specification is: 24-12-12. After testing, all indicators are qualified , The yield rate is above 98%.

Embodiment 3

[0014] Take 25.1kg of monoammonium phosphate (MAP) crushed to about 60 meshes, 11.9kg of potassium chloride (KCl), calcium carbonate (CaCO 3 ) 16.6kg of powder, mixed, dried and heated up, added to 46.4kg of molten urea solution, fully stirred for 6 minutes, keeping the temperature of the slurry at 116°C, then sending the molten slurry into an emulsifier for emulsification, and then The molten slurry is discharged into the rotary nozzle on the top of the tower granulator, granulated and cooled. The qualified particles are high-concentration NPK compound fertilizers. The product specification is: 24-12-6. After testing, all indicators are qualified , The yield rate is above 98%.

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Abstract

The invention relates to a process for producing high-concentration nitrogen-phosphorus-potassium compound fertilizer by tower granulation. It is characterized in that: the above-mentioned melt slurry needs to be emulsified in an emulsifier before granulation; the present invention adds an emulsification process before granulation, and utilizes three sets of rotations of the emulsifier, precise combination of the stator and high-speed rotation. The strong shear force generated is used to achieve the purpose of mixing, crushing and emulsification. In this process, the large particles and dry powder groups in the raw material mixture are uniformly dispersed after emulsification, so that the mixed material becomes a highly uniform emulsified liquid with an average particle size. It is 0.5μm, which solves the phenomenon of nozzle clogging due to low stirring efficiency and other reasons, and can fully achieve industrialized continuous production.

Description

technical field [0001] The invention belongs to the field of chemical technology and relates to a technology for producing high-concentration nitrogen, phosphorus and potassium compound fertilizer through tower granulation. Background technique [0002] Chinese patent application "Method for Producing High-Concentration Nitrogen, Phosphorus and Potassium Compound Fertilizer by Tower Granulation" (02103008.1) discloses a method of adding nitrogen-containing and potassium-containing powder materials and auxiliary materials to urea melt, mixing and stirring to produce melt materials After the slurry is directly sent to the tower granulator for granulation, this method has the advantages of good sphericity, high yield and the ability to produce products of various specifications. However, because ① there will inevitably be large particles and other Impurities exist, ② the mixing efficiency is low, the ultrafine particles (fine powder) in the powder are extremely difficult to mix...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05G1/00C05G5/00
Inventor 周建军秦磊古德福赵景善
Owner NINGXIA FENGYOU CHEM
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