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Magnesium ammonium phosphate-urea slow-release fertilizer and preparing method thereof

A technology of magnesium ammonium phosphate and slow-release fertilizer is applied in the field of comprehensive utilization of resources, which can solve the problems of low nitrogen content and excessive nitrogen release.

Inactive Publication Date: 2018-08-31
JINGDEZHEN CERAMIC INSTITUTE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Aiming at the problem that the nitrogen content of ammonium magnesium phosphate slow-release fertilizer is not high and the nitrogen element of the current commercial quick-acting urea is released too quickly, the invention provides a magnesium ammonium phosphate-urea slow-release fertilizer and its preparation method

Method used

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  • Magnesium ammonium phosphate-urea slow-release fertilizer and preparing method thereof
  • Magnesium ammonium phosphate-urea slow-release fertilizer and preparing method thereof
  • Magnesium ammonium phosphate-urea slow-release fertilizer and preparing method thereof

Examples

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Effect test

Embodiment 1

[0051] Raw materials: 1000g of magnesium ammonium phosphate, 50g of modified starch, and 1000g of urea.

[0052] A preparation method of magnesium ammonium phosphate-urea slow-release fertilizer, comprising the following steps:

[0053] 1) Grind 1000g of magnesium ammonium phosphate and 50g of modified starch into small particles of about 1 μm, and mix well;

[0054] 2) Take 5% of the mixture in step 1), and place it in a disc granulator;

[0055] 3) Spray water on the rotating magnesium ammonium phosphate and modified starch granules by means of atomization;

[0056] 4) Slowly add 100 g of urea (i.e. 10% of the total amount of urea) ground into small particles of 1 μm into the magnesium ammonium phosphate and modified starch materials described in step 3);

[0057] 5) water spray granulation;

[0058] 6) After the material is converted into particles of about 1mm, repeat step 2) to step 5) in a slow adding manner, wherein the amount of magnesium ammonium phosphate and modi...

Embodiment 2

[0067] Raw materials: 2000g of magnesium ammonium phosphate, 200g of modified starch, and 1000g of urea.

[0068] A preparation method of magnesium ammonium phosphate-urea slow-release fertilizer, comprising the following steps:

[0069] 1) Grind 2000g of magnesium ammonium phosphate and 200g of modified starch into small particles of 100 μm and 20 μm respectively, and mix well;

[0070] 2) Take 10% of the mixture in step 1), and place it in a disc granulator;

[0071] 3) Spray water on the rotating magnesium ammonium phosphate and modified starch granules by means of atomization;

[0072] 4) Slowly add 150 g (i.e. 15% of the total amount of urea) urea ground into small particles of 100 μm into the magnesium ammonium phosphate and modified starch materials described in step 3);

[0073] 5) water spray granulation;

[0074] 6) After the material is converted into particles of about 1mm, repeat step 2) to step 5) in a slow adding manner, wherein the amount of magnesium ammoni...

Embodiment 3

[0079] Raw materials: 3000g of magnesium ammonium phosphate, 240g of modified starch, and 1000g of urea.

[0080] A preparation method of magnesium ammonium phosphate-urea slow-release fertilizer, comprising the following steps:

[0081] 1) Grind 3000g of magnesium ammonium phosphate and 240g of modified starch into small particles of 200 μm and 50 μm respectively, and mix well;

[0082] 2) Take 8% of the mixture in step 1), and place it in a disc granulator;

[0083] 3) Spray water on the rotating magnesium ammonium phosphate and modified starch granules by means of atomization;

[0084] 4) Slowly add 140g (i.e. 14% of the total amount of urea) urea ground into small particles of 200 μm into the magnesium ammonium phosphate and modified starch materials described in step 3);

[0085] 5) water spray granulation;

[0086] 6) After the material is converted into particles of about 1 mm, repeat step 2) to step 5) in a slow adding manner, wherein the amount of magnesium ammoniu...

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Abstract

The invention discloses a magnesium ammonium phosphate-urea slow-release fertilizer and a preparing method thereof, and belongs to the technical field of resource comprehensive utilization. The methodincludes the following steps of firstly, grinding magnesium ammonium phosphate and modified starch into small particles, and conducting evenly mixing to form a magnesium ammonium phosphate and modified starch mixture; secondly, placing the mixture obtained in the first step into a disc granulator; thirdly, spraying water on the rotating magnesium ammonium phosphate and modified starch particles through an atomizing method; fourthly, slowing adding the urea ground into small particles to the magnesium ammonium phosphate and modified starch particles in the third step; fifthly, spraying water for granulating; sixthly, repeatedly executing the second step, the third step, the fourth step and the fifth step through the slow adding mode after the material is converted into the particles with the granularity of about 1 mm; seventhly, conducting stable granulating to obtain the magnesium ammonium phosphate-urea slow-release fertilizer. The magnesium ammonium phosphate-urea slow-release fertilizer particles are formed with the magnesium ammonium phosphate particles and the urea particles through the layer-by-layer wrapping mode, and the releasing speed of the urea is effectively controlled.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of resources, and more specifically relates to a preparation method of magnesium ammonium phosphate-urea slow-release fertilizer and its nutrient element release rule. Background technique [0002] In the magnesium ammonium phosphate slow-release fertilizer, the nitrogen content is only 5.5%. Using the magnesium ammonium phosphate slow-release fertilizer as a single slow-release fertilizer, the nitrogen content cannot meet the growth needs of some crops. Nitrogen is one of the essential elements for crop growth. Nitrogen deficiency will cause slow growth of crops, aging leaves, hindered organ differentiation, and decreased protein, vitamin and amino acid content in crop products. However, excessive nitrogen will cause excessive growth of crops and affect the results. Most of the commercially available nitrogen fertilizers are quick-acting fertilizers. During the application proc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00
CPCC05B7/00C05G5/12C05G5/30C05C9/00
Inventor 余荣台马湘谢志鹏汪长安赵戈吴新运陈苗苗
Owner JINGDEZHEN CERAMIC INSTITUTE
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