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High-strength urea formaldehyde slow release fertilizer and preparation method thereof

A urea-formaldehyde slow-release and urea-formaldehyde technology, applied in fertilization methods, fertilization devices, fertilizer mixtures, etc., can solve the problems of increasing obstacles to popularization and application, increased environmental pollution, and high drying costs, so as to save energy and drying costs and expand applications range, energy-saving effect

Inactive Publication Date: 2014-05-28
GUILIN JIQI BIOCHEM +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 2. The drying cost of wet granulation is very high, resulting in the waste of fuel, the increase of environmental pollution, and the waste of space; at the same time, for future green fertilizers such as "slow-release fertilizers", it will cause more obstacles to the promotion and application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0050] Example 1: Production of Medium Strength Extended Release Granules

[0051] Add in the premixer: 5.5 parts of urea formaldehyde, urea formaldehyde total nitrogen is calculated as 42%; 15 parts of ammonium sulfate, 30 parts of urea; 12 parts of ammonium phosphate; 20 parts of potassium chloride; 29.5 parts of filler bentonite. The composition of the fertilizer is: Nitrogen - 20, Phosphorus - 5, Potassium - 12.

[0052] Adjust the pressure of the extruder to medium pressure to extrude.

[0053] The compressive strength of the particles produced by this method is converted to 2.5-3.0 kg / cm 2 , the proportion of slow-release nitrogen in total nitrogen is 11.6%, and the release period is about 2 months.

[0054] It can be used as base fertilizer and topdressing fertilizer for short-term crops such as rice and vegetables. If applied properly, it can be combined with one-time fertilization of base fertilizer and topdressing fertilizer.

example 2

[0055] Example 2: Production of Medium and High Strength Sustained Release Granules

[0056] Add in the premixer: 20 parts of urea formaldehyde, the total nitrogen of urea formaldehyde is calculated as 42%; 10 parts of ammonium sulfate, 20 parts of urea; 15 parts of ammonium phosphate; 20 parts of potassium chloride; 15 parts of filler bentonite. The composition of the fertilizer is: Nitrogen - 21, Phosphorus - 6, Potassium - 12.

[0057] Adjust the pressure of the extruder to medium pressure to extrude.

[0058] The compressive strength of the particles produced by this method is converted to 2.5-4.0 kg / cm 2 , the proportion of slow-release nitrogen in total nitrogen is 40%, and the release period is about 6 months.

[0059] It can be used as base fertilizer and topdressing fertilizer for short-term crops such as sugarcane and fruit. If it is applied properly, it can be combined with one-time fertilization of base fertilizer and topdressing fertilizer.

example 3

[0060] Example 3: Production of Ultra High Strength Sustained Release Tablets:

[0061] Add in the premixer: 25 parts of urea formaldehyde, the total nitrogen of urea formaldehyde is calculated as 42%; 15 parts of ammonium sulfate, 10 parts of urea; 15 parts of ammonium phosphate; 30 parts of potassium chloride; 5 parts of filler bentonite. The composition of the fertilizer is: Nitrogen-19, Phosphorus-6, Potassium-18.

[0062] Put the mixed material powder or granules into the barrel of the tablet machine for tablet compression.

[0063] The compressive strength of the particles produced by this method is converted to 10-30 kg / cm 2 , the proportion of slow-release nitrogen in total nitrogen is 55%, and the release period is about 6-9 months, up to 2 years, and the release is gentle.

[0064] (1) The change of the tablet is not obvious after being placed in water for 24 hours. It can be used as base fertilizer and topdressing for flowers. It releases slowly and can be used ...

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Abstract

The invention provides particles and tablets of a high-strength urea formaldehyde slow release fertilizer produced through dry-process granulation. The urea formaldehyde slow release fertilizer is prepared from urea formaldehyde, nitrogenous fertilizer, phosphatic fertilizer, potassic fertilizer and packing through pressing. In addition, the invention also provides a preparation method, an application and the like of the urea formaldehyde slow release fertilizer.

Description

technical field [0001] The invention relates to the field of fertilizers, in particular to a specific preparation method of a novel high-strength urea-formaldehyde slow-release fertilizer. Background technique [0002] There are two main production methods of urea-formaldehyde slow-release fertilizer: the first one is conventional compound fertilizer granulation, that is, slow-release nitrogen fertilizer, ordinary nitrogen fertilizer, phosphorus fertilizer, potassium fertilizer and medium and trace elements are mixed together, sprayed with water or steam to produce granulation, drying; or high content high tower granulation of molten state granulation. The second is the coating method, that is, the compound fertilizer granules such as nitrogen, phosphorus, and potassium are produced first, and then sprayed with a slow-release coating such as urea-formaldehyde slurry to form a slow-release coating. But these are all "wet" granulation techniques, the disadvantages of wet gran...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00A01C21/00
Inventor 郭正陈铖李剑
Owner GUILIN JIQI BIOCHEM
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