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Formula and film-coating preparation method for biological carbon coated urea

A technology of coated urea and biochar, which is applied in the fields of fertilizer mixture, agricultural gas emission reduction, climate change adaptation, etc., can solve the problems that have not been reported in agriculture, and achieve reduced fertilizer leaching, good slow-release effect, strong ion The effect of adsorption capacity

Inactive Publication Date: 2016-02-03
UNIVERSITY OF CHINESE ACADEMY OF SCIENCES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the application of biochar prepared by low-temperature pyrolysis of crop straw biomass as coating material to produce carbon-based slow-release fertilizer products and its agricultural application has not been reported.

Method used

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  • Formula and film-coating preparation method for biological carbon coated urea
  • Formula and film-coating preparation method for biological carbon coated urea

Examples

Experimental program
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Effect test

Embodiment 1

[0041] 1. Using local agricultural waste, such as vegetables, flowers, and corn stalks as raw materials for biochar production, the raw materials are crushed, dried, and then carbonized at low temperature into 40kg of porous biochar;

[0042] 2. Mix the coating material made of 30kg biochar powder, 12kg sulfur powder, and 2kg dicyandiamide; make 3kg cornstarch into a bonding liquid, and 3kg bentonite as a bonding powder; use 50kg of large-grain urea as fertilizer The core is wrapped and granulated.

[0043] 3. The material wrapped and granulated by the disc granulator enters the dryer for drying, and after cooling and screening, the granular biochar-coated slow-release urea is 95kg, of which the total nutrient (N+P 2 o 5 +K 2 O) is 29.5kg, the total nitrogen content is 25kg, biochar is 28kg, and organic matter is 16.8kg.

[0044] Beneficial effects of the present invention are further elaborated below by test example:

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Abstract

The invention relates to a formula and a film-coating preparation method for biological carbon coated urea. The biological carbon coated urea is characterized in that the outside of a fertilizer core is coated with solid-powder-shaped biological carbon, sulfur, dicyandiamide and bentonite by using granular urea with a size of 3 to 4 mm as the fertilizer core and oxidized corn starch as bonding liquid, wherein the above-mentioned components have weight proportions as follows: 50 to 80 parts of the urea, 10 to 30 parts of the biological carbon, 2 to 10 parts of the sulfur, 2 to 3 parts of the dicyandiamide, 2 to 3 parts of the bentonite and 3 to 5 parts of the corn starch. The film-coating preparation method for the biological carbon coated urea comprises the following steps: placing the urea into a disc granulator, carrying out preheating with hot air for 5 min, spraying the bonding liquid on the surface of the urea with a high-pressure spray gun, blowing the hot air for 3 to 5 min, adding a mixed film-coating material into the disc granulator in batches and carrying out rotating for 10 min, then spraying the bonding liquid again, and carrying out drying in the air so as to obtain the biological carbon coated urea. According to the invention, the biological carbon can improve physical and chemical properties of soil and adsorb ammonium-nitrogen and nitrate-nitrogen ions; the dicyandiamide reduces nitrification; and S4O62- generated by decomposition of the sulfur can delay decomposition of the dicyandiamide, and H+ and S2O32- generated by decomposition of the sulfur can inhibit nitrification. The biological carbon coated urea provided by the invention has the advantages of low ammonia volatilization, slow generation of nitrate nitrogen, low nitrogen loss and high nitrogen effectiveness.

Description

Technical field [0001] The invention involves a formula for a biological carbon envelope urea and its envelope preparation method.Using the chemical characteristics of biological carbon electrical electrochemical, nitrifying inhibitors to inhibit the conversion of nitrogen conversion to microorganisms, and distribute it into a most -release envelope material; and under room temperature and normal pressure conditions, form a layer of envelope on the outside of the ureaPolyal nitrogen fertilizer with fertilizer rate. Background technique [0002] China is the largest country consumed nitrogen fertilizer, and the use of nitrogen fertilizer in the unit area is also significantly higher than that of developed countries.Excessive applied nitrogen fertilizer not only leads to low fertilizer utilization, but also relocate agricultural nitrogen fertilizer to water body. It has become one of the important factors of China's water quality deterioration; excessive application of chemical nit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/08C05G3/90
CPCY02A40/22Y02P20/129Y02P60/21
Inventor 胡正义王惠惠朱晓琦朱春游刘小宁周国慧
Owner UNIVERSITY OF CHINESE ACADEMY OF SCIENCES
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