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Method for producing granulated compound fertilizer by granulating through urea tower

A technology of granular compound and compound fertilizer, applied in urea compound fertilizer, fertilizer form, fertilizer mixture and other directions, can solve the problems of narrow adjustment range and large investment cost, and achieve the effects of product safety, energy saving and low investment.

Inactive Publication Date: 2011-04-06
SHENZHEN BATIAN ECOTYPIC ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But it also has the following defects: the adjustment range of product particle size is narrow, and the investment cost of high-tower granulation compound fertilizer project is large
However, there is no report on the direct application of urea tower granulation to produce granular compound fertilizers.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Get 8.9kg of urea melt, 1.0kg of monoammonium phosphate (nitrogen 10%, phosphorus 50%), 0.09kg of magnesium sulfate monohydrate, and 0.01kg of zinc sulfate and join in the mixer. The mixed slurry is made under the condition of heat preservation and heating to 130°C. The mixed slurry passes through the nozzle on the top of the tower, and the mixed slurry is sprayed into the prilling tower under the condition of the nozzle aperture Ф1.2mm for granulation. The granulated material is screened to obtain 1 Qualified particles of -4mm, the sieved fine powder and large particles are crushed and returned to the mixer together as return materials. This product is white granular nitrogen and phosphorus compound fertilizer product, it contains N 41.94%, P 2 o 5 5.0%, containing magnesium, sulfur and zinc trace elements.

Embodiment 2

[0032] Take 9.2kg of urea melt, 0.7kg of potassium chloride, 0.04kg of synergist (polyaspartic acid), 0.055kg of borax, and 0.005kg of acid blue and add them to the mixer. , heat preservation and heating to 125°C to make a mixed slurry. The mixed slurry passes through the nozzle on the top of the tower, and the mixed slurry is sprayed into the prilling tower under the condition of the nozzle aperture Ф1.3mm for granulation. The granulated material is sieved to obtain 1 Qualified particles of -4mm, the sieved fine powder and large particles are crushed and returned to the mixer together as return materials. This product is a blue granular nitrogen and potassium compound fertilizer product, which contains N 42.32%, K 2 O 4.20%, also contains synergists and boron trace elements.

Embodiment 3

[0034] Take 8.77kg of urea melt, 0.4kg of heavy superphosphate, 0.8kg of potassium sulfate, and 0.03kg of slow-release agent, and add them to the mixer, and prepare them under the conditions of 300m / min of stirring paddle line speed of the mixer, heat preservation and heating to 132°C. To form a mixed slurry, the mixed slurry passes through the nozzle on the top of the tower, and the mixed slurry is sprayed into the prilling tower under the condition of the nozzle aperture Ф1.4mm for granulation, and the granulated material is sieved to obtain qualified particles of 1-4mm, after sieving The fine powder and large particles are crushed and returned to the mixer together as the return material. This product is a white granular NPK compound fertilizer product, which contains 40.34% of N, P 2 o 5 1.84%, K 2 O 4.0%, while containing moderate elements of sulfur, calcium and slow-release agents.

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Abstract

The invention discloses a method for producing granulated compound fertilizer by granulating through a urea tower, comprising the following steps of: heating and mixing a urea melted ammonium nitrate solution and fertilizer for producing the compound fertilizer according to the proportion in a mixer to prepare compound fertilizer mixed slurry; and spraying and granulating the mixed material by a spray head of a granulator, cooling, screening, metering and packaging the granules. The invention belongs to a novel production process of the compound fertilizer. Compared with the prior art, the invention can be directly used for producing the granulated compound fertilizer in the urea tower so as to simplify the production process of the compound fertilizer.

Description

technical field [0001] The invention relates to agricultural compound fertilizers, in particular to a method for granulating urea towers to produce granular compound fertilizers. Background technique [0002] Various fertilizers are widely used in agricultural production, mainly elemental chemical fertilizers and multi-component compound fertilizers containing nitrogen, phosphorus, potassium and other nutrients. The traditional production methods of compound fertilizers mainly include aggregate method and slurry method , extrusion method and blending method, etc. They are compound fertilizers containing nitrogen, phosphorus, potassium and other nutrients by secondary processing of urea, ammonium nitrate, ammonium phosphate, heavy calcium, potassium chloride, and potassium sulfate. [0003] At present, the high-tower compound fertilizer production technology widely used in China is innovatively invented by Shenzhen Batian Ecological Engineering Co., Ltd. Its invention patent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G1/00C05G5/00C05C9/00
Inventor 张运森
Owner SHENZHEN BATIAN ECOTYPIC ENG
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