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Method for preparing zeolite coated urea

A technology for coating urea and zeolite, which is applied in fertilizer mixtures, fertilization devices, applications, etc., to achieve the effects of improving the quality of agricultural products, increasing crop yield, and reducing pollution

Active Publication Date: 2013-01-09
INST OF SOIL & FERTILIZER ANHUI ACAD OF AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The utilization rate of nitrogen fertilizer in my country is only 28-41%. Nitrogen fertilizer is lost through volatilization, leaching and denitrification, which brings many negative impacts on the environment.

Method used

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  • Method for preparing zeolite coated urea
  • Method for preparing zeolite coated urea
  • Method for preparing zeolite coated urea

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Experimental program
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Embodiment Construction

[0018] The preparation method of zeolite coated urea comprises the following steps:

[0019] (1), acrylic resin is added in the reaction container that is filled with chloroform, the volume ratio of acrylic resin and chloroform is 1-2: 4, then add polyvinyl alcohol and boric acid and stir to obtain binder solution, polyvinyl alcohol and boric acid account for The weight ratio of acrylic resin is 1-5%, and the mass ratio of polyvinyl alcohol and boric acid is 2:1;

[0020] (2), the urea is sieved to get the urea granules whose particle size is 3-5mm;

[0021] (3), zeolite powder is sieved, get particle diameter 280-320 purpose zeolite powder;

[0022] (4) Adjust the corner of the coating machine to 35°, put 100g of urea into the coating machine, use a hair dryer to send hot air to preheat the urea for 5-10 minutes, and then spray the binder solution on the surface of the urea in an amount of Until the urea particles are not bonded to each other, then dry with hot air for 3-5 ...

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Abstract

The invention discloses a method for preparing zeolite coated urea. The method comprises the following steps of: coating zeolite and a bonding agent on the surface of urea; adsorbing ammonium ions converted by the urea by utilizing a three-dimensional polyanion structure formed by linking SiO4 and AlO4 tetrahedrons of the zeolite through oxygen atoms; and fixing and releasing the ammonium ions. The method has the advantage of low cost, and the prepared zeolite coated urea can obviously improve the utilization rate of nitrogenous fertilizers and the output of crops and has no pollution.

Description

technical field [0001] The invention relates to the field of agricultural environmental protection, in particular to a preparation method of zeolite-coated urea. Background technique [0002] Fertilizer is the guarantee of high grain yield. In recent decades, a similar phenomenon has appeared almost simultaneously in the production and application of chemical fertilizers, mainly nitrogen fertilizers, in countries all over the world, that is, the efficiency of increasing the production of chemical fertilizers has declined. The reason is that the utilization rate of nitrogen fertilizer decreased. The utilization rate of nitrogen fertilizer in my country is only 28-41%. Nitrogen fertilizer is lost through volatilization, leaching and denitrification, which brings many negative impacts on the environment. A high-yield, high-quality, high-efficiency, and low-consumption fertilization system will be an inevitable requirement for the "three high agriculture" and sustainable agric...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05G3/08C05G3/90
CPCY02P20/129
Inventor 李敏叶舒娅郭熙盛刘枫
Owner INST OF SOIL & FERTILIZER ANHUI ACAD OF AGRI SCI