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Humic acid releasing-controlled fertilizer and preparation method thereof

A technology of controlled-release fertilizer and humic acid, applied in fertilization equipment, fertilizer mixture, application, etc., can solve the problems of impact resistance, low wear resistance, low effective nutrient content of controlled-release fertilizer, high production cost, etc., to increase microbial community, improving crop quality, and reducing production costs

Active Publication Date: 2009-11-04
KINGENTA ECOLOGICAL ENG GRP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the research on thermoplastic resin and thermosetting resin-coated controlled-release fertilizers at home and abroad has developed to a relatively high level. There is a large room for improvement; it has been reported that clay minerals and industrial waste solid powder are used to wrap fertilizers with liquid binders to make controlled-release fertilizers. Although this method achieves the purpose of reducing production costs, it does not use curing agents. , leading to low impact resistance and wear resistance of the product. On the other hand, due to the use of a large amount of clay minerals and industrial waste, the effective nutrient content of the controlled-release fertilizer produced is low

Method used

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  • Humic acid releasing-controlled fertilizer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1, preparing humic acid controlled-release fertilizer with a controlled-release period of 7 months.

[0028] Weigh 500kg of diammonium phosphate (18-46-0) granular fertilizer, preheat to 60°C in a disc granulator, and mix 1.38kg of epoxy resin and 0.12kg of epoxy resin curing agent T-31 (Tianjin Yanhai Chemical Co., Ltd.) mixed evenly and added to the moving fertilizer particles, with the continuous movement of the fertilizer particles, a cohesive liquid layer is formed on the surface, and the weighed 10kg air-dried and pulverized weathered coal is sprinkled on the disc for granulation On the fertilizer in the machine, continue to heat and keep the temperature at 60°C. With the continuous rotation of the granulator, the weathered coal powder is evenly wrapped on the surface of the fertilizer, and it can be solidified into a film after about 6 minutes; the coating material weighed according to the above 500kg of diammonium phosphate fertilizer and then repeatedly...

Embodiment 2

[0029] Example 2, preparing humic acid controlled-release fertilizer with a controlled-release period of 9 months.

[0030] Weigh 500kg of Shima brand compound fertilizer (15-15-15) granular fertilizer from BASF, Germany, preheat to 65°C in a disc granulator, mix 2.25kg epoxy resin and 0.25kg triethylenetetramine evenly and add On the moving fertilizer granules, with the continuous movement of the fertilizer granules, a cohesive liquid layer is formed on the surface, and the weighed 15kg air-dried and pulverized weathered coal is sprinkled on the fertilizer in the disc granulator, and continues to heat and keep The temperature is 70°C. With the continuous rotation of the granulator, the weathered coal powder is evenly wrapped on the surface of the fertilizer, and it can be solidified into a film after about 5 minutes; -15-15 fertilizers are repeatedly wrapped three times to obtain a humic acid controlled-release fertilizer with a total coating rate of about 12%wt and a control...

Embodiment 3

[0031] Example 3, preparing humic acid controlled-release fertilizer with a controlled-release period of 9 months.

[0032] Weigh 1000kg of 46-0-0 large granule urea, preheat it to 70°C in the drum, mix 4.5kg epoxy resin and 0.5kg T-31 evenly and add it to the moving fertilizer granules, and keep moving with the fertilizer granules , form a cohesive liquid layer on its surface, sprinkle 100kg of air-dried and pulverized lignite on the fertilizer in the disc granulator, continue to heat and keep the temperature at 65°C, and with the continuous rotation of the granulator, the weathering The coal powder is evenly wrapped on the surface of the fertilizer, and it can solidify into a film after about 5 minutes. A humic acid controlled-release fertilizer with a total coating rate of about 11%wt and a controlled release period of 9 months can be obtained, which is packaged and put into storage after cooling.

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Abstract

The invention discloses a humic acid controlled-release fertilizer, the total coating rate of which is 3-20%wt, which is prepared by the following process: the first step: preheating the granular fertilizer, adding epoxy resin and its curing agent; the second step Step 2: Sprinkle the humic acid solid film material on the moving fertilizer particles, continue heating to maintain the temperature, and under the action of epoxy resin and its curing agent, after 3-6 minutes, the humic acid solid film material is wrapped in the On the moving granular fertilizer, an impact-resistant and wear-resistant coating layer is formed to complete the coating once; the third step: repeat the first and second steps several times in order until the humic acid solid film material is completely wrapped on the fertilizer particles , the coating layer is solidified, and a humic acid controlled-release fertilizer with a controlled-release period ranging from 1 to 12 months is obtained. The invention can improve fertilizer utilization rate, reduce agricultural non-point source pollution, enhance stress resistance of plants and improve crop quality.

Description

technical field [0001] The invention belongs to the technical field of controlled-release fertilizer production, and in particular relates to a humic acid-coated controlled-release fertilizer and a preparation method thereof. Background technique [0002] Humic acid is a mixture of natural macromolecular aromatic and hydroxycarboxylic acids, the main elements of which are carbon, hydrogen, oxygen, nitrogen and sulfur. Humic acid has a variety of active groups (carboxyl, phenolic hydroxyl, alcoholic hydroxyl, methoxy, etc.) endowed it with a variety of functions, such as acidity, hydrophilicity, cationic exchange, complexing ability and high Adsorption capacity, etc., are based on the characteristics of humic acid. The research on it has always been concerned by people, and a lot of research has been done on its use effect. [0003] Humic acid widely exists in weathered coal and lignite. In the late 19th century, some people abroad began to use humic acid. Since the 1960s, C...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05G3/00
Inventor 万连步解玉洪陈剑秋
Owner KINGENTA ECOLOGICAL ENG GRP
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