Manufacturing method of nitrogen phosphorus potassium composite fertilizer rich in nitrogen and potassium

A nitrogen-phosphorus-potassium compound fertilizer and a manufacturing method technology are applied in the manufacturing field of tower-type rotary shotcrete granulation to produce high-nitrogen and high-potassium nitrogen-phosphorus-potassium compound fertilizers, which can solve the problem that the viscosity of the mixed slurry is not suitable for adjustment, cannot meet market demands, and Restrictions on raw materials used, etc., to achieve the effect of anti-counterfeiting dissolution speed, low capital investment and operating costs, and high yield

Active Publication Date: 2006-05-10
山东新天新肥业有限公司
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

From the published documents (patent application numbers: 02103008.1, 99127009.6), their deficiencies obviously exist: the raw materials used are limited, which is not conducive to process adjustment and affects the process start-up rate; there are few varieties ...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Take 307kg of urea molten liquid produced by a synthetic ammonia plant, 326kg of powdered diammonium phosphate heated to 90°C with a horizontal heater, with a particle size of less than 1 mm, and potassium chloride heated to 135°C with a horizontal heater, with a particle size of less than 1 mm 167kg, then add 200kg of calcium powder additives, stir and mix with a mixer for 3.8 minutes, the slurry temperature is 120°C, the slurry co-melt with a viscosity of 1800cPa.s, and the melt slurry is sprayed into The effective height is 65 meters and the air is naturally cooled, and solidified into granular high-nitrogen and high-potassium compound fertilizer through air cooling. The product specification is 20-15-10, the moisture content is 1.10%, and the yield is 98.5%.

Embodiment 2

[0012] Take 438kg of urea molten liquid urea heated to 130°C with solid urea, 178kg of powdered monoammonium phosphate heated to 110°C with a horizontal heater, with a particle size of less than 1 mm, and 178 kg of powdered monoammonium phosphate heated to 135°C with a horizontal heater, with a particle size of less than 1 mm 267kg of potassium chloride, and then 117kg of calcium powder additive, stirred and mixed by a mixer for 9 minutes, the temperature of the slurry is 120°C, the viscosity is 2000cPa.s slurry co-melt, the melt slurry is made by rotary spraying The granulator is sprayed into the natural cooling air with an effective height of 65 meters, and solidifies into granular high-nitrogen and high-potassium compound fertilizer through air cooling. The product specification is 22-8-16, the moisture content is 1.2%, and the yield is 98.8%.

Embodiment 3

[0014] Take 271kg of urea molten liquid produced by a synthetic ammonia plant, heat it to 115°C with a horizontal heater, and use a horizontal heater to heat to 135°C sulfur-based nitrogen, phosphorus, and potassium compound fertilizer with a particle size of less than 1mm and specifications of 13.2-17.5-14. ℃, 31 kg of potassium chloride with a particle size of less than 1 mm, and then 126.5 kg of calcium powder additives, stirred and mixed by a mixer for 3 minutes, the temperature of the slurry is 116 ° C, and the viscosity is 2200cPa.s. The slurry is sprayed into the natural cooling air with an effective height of 65 meters through the rotary spray granulator, and solidified into granular high-nitrogen and high-potassium compound fertilizer through air cooling. The product specification is 20-10-10, and the moisture content is 1.0%. The finished product The rate is 98%.

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Abstract

The invention relates to a method for manufacturing high-nitrogen, high-potassium, nitrogen, phosphorus, and potassium compound fertilizers. The molten liquid or solid urea produced in an ammonia plant is heated to 125-135°C, and the powdered potassium-containing raw material with a particle size of less than 1 mm is heated to 110-100°C. 135°C or heated to 90-110°C, phosphorus-containing raw materials with a particle size of less than 1 mm are added to calcium powder, placed in a mixer and stirred for 2-10 minutes, and the formation temperature is 110-135°C, viscosity is 1500-2500cPa.s, The mixed slurry with good fluidity is co-melted, and then the melted slurry is sprayed into an air cooling tower with an effective height greater than 50 meters or 65 meters and a diameter of 6-20 meters by using a rotary spray granulator, and solidified by air cooling It is powdery or granular high-nitrogen and high-potassium compound fertilizer. It can adapt to various phosphorus and potassium-containing raw materials, and can produce various high-nitrogen and high-potassium NPK compound fertilizers with low production costs.

Description

technical field [0001] The invention relates to a method for manufacturing nitrogen, phosphorus and potassium compound fertilizers, which is a method for producing high-nitrogen and high-potassium nitrogen, phosphorus and potassium compound fertilizers through tower-type rotary spraying and granulation. Background technique [0002] The high-concentration nitrogen, phosphorus, and potassium compound fertilizer produced by the tower-type rotary spray granulation method is a new process that has been used in this field in recent years. How to improve the deficiencies in this process is the research of those skilled in the art. topic. From the published documents (patent application numbers: 02103008.1, 99127009.6), their deficiencies obviously exist: the raw materials used are limited, which is not conducive to process adjustment and affects the process start-up rate; there are few varieties of production, which cannot meet market demand; heating energy High consumption and a...

Claims

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Application Information

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IPC IPC(8): C05G1/00C05G5/00B01J2/02
Inventor 郑树林张国林尹俊东王伟阚洪福
Owner 山东新天新肥业有限公司
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