Spray pelleting process of compound fertilizer

A technology of shotcrete granulation and compound fertilizer, applied in potash fertilizer, phosphate fertilizer, fertilizer form, etc., can solve the problems of high production cost, low market acceptance, uneven particle surface, etc., and achieve low production cost and high market acceptance. , the effect of smooth particle surface

Inactive Publication Date: 2006-09-20
潍坊昌大肥料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of the above two methods is that potassium sulfate, urea, ammonium sulfate or ammonium oxide in the raw materials used are all basic fertilizers prepared into finished products, and compound fertilizers are reproduced with these basic fertilizers, resulting in high prod

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example

[0014] example 1

[0015] Add 23 tons of sulfuric acid with a concentration of 98% and 15 tons of potassium chloride into the reactor, heat to 100°C, and react for 60 minutes to generate 30 tons of potassium bisulfate solution, add 18.5 tons of water with 34 tons of monoammonium phosphate, and heat At 100°C, 52.5 tons of monoammonium phosphate aqueous solution is generated, 5 tons of urea is added to the mixed solution of potassium bisulfate solution and monoammonium phosphate aqueous solution to dissolve, and stirred evenly to form 87.5 tons of mixed acid, with 12.3 tons of The liquid ammonia and mixed acid undergo neutralization reaction to form a neutralized slurry. The neutralized slurry is pumped into the second-flow external mixing spray gun with a submerged pump, and the compressed air sent from the air station also enters the spray gun, and the compressed air will neutralize the slurry. The material is sprayed and atomized, and the atomized neutralized slurry is spraye...

Example

[0016] Example 2

[0017] Add 23 tons of sulfuric acid with a concentration of 98% and 15 tons of potassium chloride into the reactor, heat to 100°C, and react for 60 minutes to generate 30 tons of potassium bisulfate solution, add 19.6 tons of water with 36.4 tons of monoammonium phosphate, and heat At 100°C, 56 tons of monoammonium phosphate aqueous solution is produced, and the prepared potassium bisulfate solution and monoammonium phosphate aqueous solution are stirred evenly to form 86 tons of mixed acid, which is neutralized with 14 tons of liquid ammonia and mixed acid to form a neutralized Slurry, use the submerged pump to drive the neutralized slurry into the second-flow external mixing spray gun, and the compressed air sent from the air station also enters the spray gun, and the compressed air will spray the neutralized slurry to atomize, and the atomized neutralized slurry The slurry is sprayed onto the outer surface of the returned material raised in the granulator...

Example

[0018] Example 3

[0019] Add 30.3 tons of sulfuric acid with a concentration of 98% and 20.2 tons of potassium chloride into the reactor, heat to 100°C, and react for 60 minutes to generate 40 tons of potassium bisulfate solution, add 18.5 tons of water with 34 tons of monoammonium phosphate, and heat When it reached 100°C, 52.5 tons of monoammonium phosphate aqueous solution was produced, and the prepared potassium bisulfate solution and monoammonium phosphate aqueous solution were stirred evenly to form 92.5 tons of mixed acid, which was neutralized with 8.7 tons of liquid ammonia and mixed acid to form neutralization Slurry, use the submerged pump to drive the neutralized slurry into the second-flow external mixing spray gun, and the compressed air sent from the air station also enters the spray gun, and the compressed air will spray the neutralized slurry to atomize, and the atomized neutralized slurry The slurry is sprayed onto the outer surface of the returned material ...

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Abstract

This invention relates to a method for spray granulation of composite fertilizers, that is, potassium chloride and oil of vitriol react with each other to produce potassium hydrosulphate solution. The potassium hydrosulphate solution is homogeneously mixed with ammonium dihydrophosphate and reacts with ammonia to produce neutralization paste containing ammonium sulphate, potassium sulphate and diammonium hydrophosphate. The neutralization paste is then granulated, dried, cooled and screened to obtain composite fertilizers. This spray granulation of composite fertilizers has the advantages of low production cost and smooth particle surfaces.

Description

technical field [0001] The invention relates to a preparation method of compound fertilizer, more specifically a spray granulation method of compound fertilizer. Background technique [0002] Common compound fertilizer granulation methods include agglomeration granulation, extrusion granulation and ammoniation granulation. The agglomeration granulation method is to agglomerate basic fertilizers containing nitrogen, phosphorus and potassium nutrients, such as monoammonium phosphate, potassium sulfate, urea, ammonium sulfate or ammonium chloride, etc., into granules with a drum granulator after stirring evenly; The granulation method is to extrude the above-mentioned raw materials into granules with an extrusion granulator. The disadvantage of the above two methods is that potassium sulfate, urea, ammonium sulfate or ammonium oxide in the raw materials used are all basic fertilizers prepared into finished products, and compound fertilizers are reproduced with these basic fert...

Claims

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Application Information

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IPC IPC(8): C05G1/00C05G5/00C05D1/02C05B7/00
Inventor 朱庆然王涛王广琰张西森
Owner 潍坊昌大肥料有限公司
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