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A kind of organic matter-coated slow-release fertilizer and preparation method thereof

A slow-release and organic matter coating technology, applied in fertilization devices, fertilizer mixtures, applications, etc., can solve the problems of soil residual environmental risks, difficulty in biodegradation, etc., achieve excellent physical controlled release performance, abundant and cheap sources, no drying required Effect

Inactive Publication Date: 2011-12-14
SOUTH CHINA AGRI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, since the polymer organic compound coating layer material is not organic matter in the traditional sense (substances containing vital functions), it is difficult to biodegrade and may remain in the soil, which may bring certain environmental risks.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Using lignite as the main coating material, the process of producing organic coated slow-release urea with a nitrogen content of 31% by using a disc granulator is as follows:

[0034]Start the disc, add 100kg of round granule urea with a particle size of 2 to 4mm in the rotating disc, sprinkle 1.5kg of solidified binder liquefied MDI (produced by Dow Chemical in the United States), and make the urea and solidified binder in the disc Rotate to the surface of urea to form a layer of bonding liquid layer, spread 15kg of lignite (organic carbon mass content is 25%) through a 100 mesh sieve, turn to lignite and coat the surface of the coated fertilizer to form a layer of coating layer; Then sprinkle 2.0kg of cured binder liquefied MDI to infiltrate the coating layer, sprinkle 15kg of the above-mentioned lignite that has passed through a 100 mesh sieve, and turn until the lignite is coated on the surface of the coated fertilizer; then sprinkle 1.5kg of cured binder liquefied M...

Embodiment 2

[0036] Using lignite as the main coating material, the process of producing organic coated slow-release urea with a nitrogen content of 35% by using a disc granulator is as follows:

[0037] Start the disc, add 100 kg of round granule urea with a particle size of 2 to 4 mm in the rotating disc, and sprinkle 2.5 kg of solidified binder liquefied MDI (produced by Dow Chemical in the United States), so that the urea and solidified binder are mixed on the disc. Rotate to the surface of urea to form a layer of cohesive liquid layer, spread 15kg of lignite (organic carbon mass content is 41%) through 200 mesh sieves, turn to lignite coated on the surface of the coated fertilizer to form a layer of coating layer; Sprinkle 1.5kg of cured binder liquefied MDI again to infiltrate the coating layer, sprinkle 13kg of the above-mentioned lignite, and rotate until the lignite is coated on the surface of the coated fertilizer. Take it out and pack it, and then the organic matter-coated slow-...

Embodiment 3

[0039] Using lignite as the main coating material, the process of producing organic coated slow-release urea with a nitrogen content of 40% by using a disc granulator is as follows:

[0040] Start the disc, add 100 kg of round granule urea with a particle size of 2 to 4 mm in the rotating disc, and sprinkle 2.5 kg of solidified binder liquefied MDI (produced by Dow Chemical in the United States), so that the urea and solidified binder are mixed on the disc. Rotate until the surface of the urea forms a layer of bonding liquid, spread 12.5kg of lignite (organic carbon mass content is 44%) through a 200 mesh sieve, and rotate until the lignite is coated on the surface of the coated fertilizer. Take it out and pack it, and then the organic matter-coated slow-release urea product is obtained. The nutrient dissolution rate of the product in water for one hour is less than 70%, and the fertilizer effect period in soil can reach 40-50 days; the organic matter content of the product is...

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Abstract

The invention discloses an organic matter-coated slow-release fertilizer and a preparation method thereof. The slow-release fertilizer is prepared from the following raw materials in terms of mass percentage: 10%-70% organic matter solid powder, 2%-20% solidified binder and 10% to 88% granular fertilizer. The invention uses the organic solid powder coating material to make the organic coated slow-release fertilizer have the advantages of no solvent recovery, no drying, fast film formation, abundant and cheap sources of coating materials in the production process, and can be produced by open conventional equipment. The organic matter-coated slow-release fertilizer of the invention has excellent physical controlled-release performance, and the fertilizer effect can exceed 100 days, and the controlled-release time can be adjusted as required. At the same time, the coating material used can not only degrade in the soil but also supplement high-quality organic matter to the soil, avoiding the possible soil acidification caused by sulfur coating and the residue problems caused by resin coating, which is more friendly to the environment. It is suitable for planting fields such as agriculture and forestry.

Description

technical field [0001] The invention belongs to the field of coated fertilizers, in particular to an organic coated slow-release fertilizer and a preparation method thereof, in particular to a coated slow-release fertilizer prepared with organic matter as the main coating material and a preparation method thereof. Background technique [0002] Slow-release fertilizer is a new value-added fertilizer in the era of low-carbon economy and an important development direction of the fertilizer industry in the 21st century. The research and development of slow-release fertilizers with high utilization rate, low loss and environmental friendliness is of great significance in terms of saving resources, realizing the coordinated development of agricultural production and ecology, saving costs and increasing efficiency, saving energy and reducing emissions. [0003] Coated slow-release fertilizer is a kind of slow-release fertilizer that delays the dissolution of fast-dissolving chemica...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00
Inventor 毛小云陈娴廖宗文黄雷
Owner SOUTH CHINA AGRI UNIV
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