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Method for preparing slow/controlled release fertilizer by using urea coated with diatomite

A technology of coating urea and diatomaceous earth, applied in fertilization equipment, fertilizer mixture, agriculture, etc., can solve the problems of pollution, low utilization rate of urea, etc., achieve the effect of improving soil fertility, low decomposition rate, and improving soil structure

Active Publication Date: 2015-06-17
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the problems of low utilization rate of urea and its pollution to the environment, the present invention provides slow / controlled release diatomite-coated urea and a preparation method thereof, the purpose of which is to improve the utilization rate of urea and soil fertility, reduce cost and environment Pollution, to achieve the coordinated development of resource utilization and environmental optimization

Method used

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  • Method for preparing slow/controlled release fertilizer by using urea coated with diatomite
  • Method for preparing slow/controlled release fertilizer by using urea coated with diatomite

Examples

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Effect test

Embodiment 1

[0031] First put diatomaceous earth into drying box and dry 15h at 100 DEG C, after sieving through 200~500 mesh standard sample sieves, seal for subsequent use;

[0032] Weigh different amounts of PVA, heat it to dissolve in water, then add a certain amount of PVAc, and after cooling, set the volume to form a mixed binder. The mass percentage of PVA in the mixed binder solution is 1%, and the mass percentage of PVAc 0.04%, sealed for standby;

[0033] Put 90g of urea with uniform particle size into the sugar coating machine. After preheating for 5 minutes, start rolling granulation, and spray 3mL of atomized 1% PVA / 0.4PVAc binder in it, until the surface of urea granules forms a uniform layer. After adding 3.3g of diatomite powder, roll and granulate for about 4 minutes until the surface of the fertilizer granules forms a coating layer. Repeat the above process 3 times to finish adding 10g of diatomaceous earth, roll and granulate until the granules are completely dry, and ...

Embodiment 2

[0036]First put diatomaceous earth into drying oven and dry 10h at 200°C, after sieving through a 200-500 mesh standard sampling sieve, seal it for subsequent use;

[0037] Weigh different amounts of PVA, heat it to dissolve in water, then add a certain amount of PVAc, and after cooling, constant volume is configured to form a mixed binder. The mass percentage of PVA in the mixed binder solution is 3%, and the mass percentage of PVAc 0.8%, sealed for standby;

[0038] Put 90g of urea with uniform particle size into the sugar coating machine. After preheating for 5 minutes, start rolling granulation, spray 2mL of atomized 3% PVA / 0.8PVAc binder into it, and wait until the surface of urea granules forms a uniform layer. After adding 3.3g of diatomite powder, roll and granulate for about 5 minutes until the surface of the fertilizer granules forms a coating layer. Repeat the above process 3 times to finish adding 10g of diatomaceous earth, roll and granulate until the granules ar...

Embodiment 3

[0041] First put diatomaceous earth into drying oven and dry 12h at 150°C, after sieving through a 200-500 mesh standard sampling sieve, seal it for subsequent use;

[0042] Weigh different amounts of PVA, heat it to dissolve in water, then add a certain amount of PVAc, and after cooling, constant volume is configured to form a mixed binder. The mass percentage of PVA in the mixed binder solution is 4%, and the mass percentage of PVAc 1%, sealed for later use;

[0043] Put 90g of urea with uniform particle size into the sugar coating machine. After preheating for 5 minutes, start rolling granulation, spray 1.5mL of atomized 4%PVA / 1.0%PVAc binder into it, and wait until the surface of the urea granules forms a After layering a uniform binder, add 2.5g of diatomaceous earth powder, roll and granulate for about 6 minutes until the surface of the fertilizer granules forms a coating layer. Repeat the above process 4 times to finish adding 10g of diatomaceous earth, roll and granul...

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Abstract

A method for preparing slow / controlled release fertilizer by coating urea with diatomite relates to the technical field of slow / controlled release fertilizer. Follow the steps below: (1) First put diatomaceous earth into a drying oven for drying, pass through a 200-500-mesh standard sampling sieve and seal it for later use; (2) Weigh PVA of different qualities and heat to dissolve Add a certain amount of PVAc to the water, and after cooling, set the volume to make a mixed binder. (3) Pour the sieved granular urea into the sugar coating machine, roll and granulate after preheating, and spray mist into the sugar coating machine Add a certain amount of diatomaceous earth powder after the surface of urea granules forms a layer of uniform bonding liquid, and roll and granulate for about 4 to 8 minutes until a layer of dense package is formed on the surface of fertilizer granules. layer; repeat the above process 3 to 6 times to obtain diatomaceous earth-coated urea. The process step of the present invention is simple and easy, does not need expensive equipment and harsh production conditions, will greatly improve the utilization rate of urea and reduce costs, and is suitable for the application of field crops.

Description

technical field [0001] The invention relates to the technical field of slow / controlled release chemical fertilizers, in particular to a method for preparing slow / controlled release chemical fertilizers by coating urea with diatomite. Background technique [0002] Agriculture is the foundation of our country's national economy, and chemical fertilizers, especially urea, play a very important role in agricultural production. China is both a major producer and user of urea, but the utilization rate of urea after it is applied to the soil is usually only 30-40%. The main reason for the low utilization rate is the volatilization, leaching and runoff of nitrogen. According to surveys, the total amount of nitrogen fertilizer invested in China is about 20 million tons of nitrogen every year, of which about 50% will be lost with rainwater or enter the air. In addition, traditional fertilization methods can easily lead to water quality, soil and food pollution. The nitrate content in...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05G3/00C05G3/04C05G3/80
Inventor 秦高梧胡建设李松贾迎钢
Owner NORTHEASTERN UNIV LIAONING
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