Organic matter coated urea and production method thereof

A technology for coating urea and a production method, which is applied to fertilizer mixtures, fertilization devices, applications, etc., can solve the problems of unsatisfactory slow-release performance, high requirements for production process conditions, and low fertilizer nitrogen content, and achieves good slow-release effect. , The effect of low production cost and high production capacity

Active Publication Date: 2012-06-27
INST OF AGRI RESOURCES & REGIONAL PLANNING CHINESE ACADEMY OF AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, there are still some technical defects in these prior art, such as low fertilizer nitrogen content, unsatisfactory slow-release per

Method used

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  • Organic matter coated urea and production method thereof
  • Organic matter coated urea and production method thereof
  • Organic matter coated urea and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0090] Example 1: Preparation of organic coated urea of ​​the present invention.

[0091] The preparation steps are as follows:

[0092] A, preparation of urea-formaldehyde binder

[0093] 1.5 moles of urea and 1 mole of 38% formaldehyde solution by weight are mixed in a reaction kettle sold by Wuxi Xuelang Riveting and Welding Factory Co., Ltd. under the trade name external coil heating stainless steel reactor to obtain a mixture; use 16% NaOH by weight Solution Adjust the pH value of the mixture to 8, then react at a temperature of 94 ° C for 25 min, and then use 14% H by weight after cooling 2 SO 4 The pH value of the aqueous solution was adjusted to 3.5, followed by a constant temperature reaction at a temperature of 68°C for 38 minutes, and then the reactant was dried in an oven produced by Wujiang Dongyuan Electric Heating Equipment Co., Ltd. at a temperature of 80°C, and then crushed to 120 Object, obtain a kind of urea-formaldehyde binding agent;

[0094] B. The ur...

Embodiment 2

[0099] Example 2: Preparation of the organic coated urea of ​​the present invention.

[0100] The preparation steps are as follows:

[0101] A method for producing organic matter coated urea, characterized in that the steps of the method are as follows:

[0102] A, preparation of urea-formaldehyde binder

[0103] 1.6 moles of urea and 1 mole of 38% formaldehyde solution by weight are mixed in a reaction kettle sold by Wuxi Xuelang Riveting and Welding Factory Co., Ltd. under the trade name external coil heating stainless steel reactor; use 16% NaOH by weight Adjust the pH value of the mixture to 8, then react at a temperature of 90°C for 30 minutes, and then use 10% H by weight after cooling 2 SO 4 The pH value of the aqueous solution was adjusted to 4.5, followed by a constant temperature reaction at a temperature of 60°C for 30 minutes, and then the reactant was dried at a temperature of 84°C in an oven produced by Wujiang Dongyuan Electric Heating Equipment Co., Ltd., and ...

Embodiment 3

[0109] Example 3: Preparation of the organic coated urea of ​​the present invention.

[0110] The preparation steps are as follows:

[0111] A method for producing organic matter coated urea, characterized in that the steps of the method are as follows:

[0112] A, preparation of urea-formaldehyde binder

[0113] 1.5 moles of urea and 1 mole of 40% by weight formaldehyde solution are mixed in a reaction kettle sold by Wuxi Xuelang Riveting and Welding Factory Co., Ltd. under the trade name external coil heating stainless steel reactor to obtain a mixture; use 14% by weight of NaOH Solution Adjust the pH value of the mixture to 9, then react at a temperature of 100 ° C for 26 min, and then use 16% H by weight to 2 SO 4 The pH value of the aqueous solution was adjusted to 3.8, followed by a constant temperature reaction at a temperature of 70°C for 34 minutes, and then the reactant was dried in an oven produced by Wujiang Dongyuan Electric Heating Equipment Co., Ltd. at a tem...

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PUM

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Abstract

The invention relates to an organic matter coated slow release urea product and a production method thereof. According to the invention, weathered coal, urea and formaldehyde are used as raw materials for the fertilizer of the urea product provided in the invention; at first, urea reacts with formaldehyde to produce a urea formaldehyde binder, then the urea formaldehyde binder is mixed with weathered coal in proportion, a dilute sulfuric acid solution is used as a spraying agent, and coating and drying are carried out on large granule urea by using an aggregate process so as to prepare the organic matter coated slow release urea product. Slow release of nutrients is realized through organic matter coating, a utilization rate of the fertilizer is improved by 10 to 15%, loss of nutrients is reduced, and secondary pollution is avoided. Raw materials for the product provided in the invention are widely available, and fertilizer particles have high mechanical strength, do not deliquescence and are convenient to transport and apply; therefore, the organic matter coated slow release urea product has a very broad application prospect in production.

Description

【Technical field】 [0001] The invention belongs to the technical field of slow-release fertilizers. More specifically, the present invention relates to an organic-matter-coated slow-release urea product, and also relates to a production method of the organic-matter-coated slow-release urea product. 【Background technique】 [0002] In the coated slow-release fertilizers developed at home and abroad, there are mainly two types of coating materials used, one is organic polymers, such as resin polyolefins, and the other is poorly water-soluble or slightly soluble inorganic fertilizers. Materials, such as sulfur, phosphate rock powder, calcium magnesium phosphate fertilizer, etc. [0003] The production of polymer-coated slow-release fertilizers requires special coating towers and solvents. The coating materials are expensive, the production process costs are high, and the production capacity is low. The coating materials are difficult to decompose in the soil and are easy to rema...

Claims

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Application Information

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IPC IPC(8): C05G3/08C05G3/90
Inventor 袁亮李燕婷温延臣林治安赵秉强
Owner INST OF AGRI RESOURCES & REGIONAL PLANNING CHINESE ACADEMY OF AGRI SCI
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