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

A technology for coating urea and diatomaceous earth, applied in fertilization devices, fertilizer mixtures, applications, etc., can solve problems such as low utilization rate of urea, pollution, etc., and achieve the effects of low decomposition rate, improved soil fertility, and long fertilizer effect period.

Active Publication Date: 2014-02-19
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

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

The invention discloses a method for preparing a slow/controlled release fertilizer by using urea coated with diatomite. The method comprises the steps as follows: 1), firstly, the diatomite is placed into a drying oven for drying, screened by a standard sampling sieve with the size of 200-500 meshes and sealed for standby use; 2), PVA (polyvinyl alcohol) with different mass is weighed and heated, so that the PVA is dissolved in water, then a certain amount of PVAc (polymer vinyl acetate) is added, and the mixture is cooled and prepared into a mixed binding agent according to a constant volume; and 3), screened urea particles are poured into a sugarcoating machine, a certain amount of diatomite powder is added until the a uniform layer of a binding liquid is formed on the surfaces of the urea particles, and rolling pelleting is performed for about 4-8 hours until a compact packaging layer is formed on the surfaces of fertilizer particles; and the processes are repeated for 3-6 times, so that the urea coated with the diatomite is obtained. According to the method, the processes and the steps are simple and feasible, expense equipment and tough production conditions are not required, the utilization rate of the urea is greatly improved, the cost is reduced, and the fertilizer is applicable to 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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IPC IPC(8): C05G3/00C05G3/04C05G3/80
Inventor 秦高梧胡建设李松贾迎钢
Owner NORTHEASTERN UNIV
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