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Production method of biological carbon coated controlled-release fertilizer

A technology of coating controlled-release fertilizer and production method, which is applied in the directions of layered/coated fertilizer, fertilization device, fertilizer mixture, etc.

Inactive Publication Date: 2015-03-25
CHINA NAT RICE RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The preparation of biochar slow-release fertilizer has not been reported at home and abroad

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Crush the dried rice stalks into particles with a diameter of 5mm, and pyrolyze them for 5 hours under the condition of anoxic and 650°C to form granular biochar. After cooling and grinding, a 180um biochar powder is obtained; sieve 80kg of granular urea with a particle size of 3 mm Then transfer to the blast fluidized bed, preheat to 60°C and spray 10kg of urea-formaldehyde resin, so that the urea-formaldehyde resin is coated on the surface of the continuously rolling fertilizer particles, and gradually wraps to form a uniform liquid layer; Spray 5kg of biochar powder on the continuous On the rolling fertilizer granules, and continue to heat to keep the material temperature at 65 ℃, after 10 minutes of treatment, biochar is wrapped on the moving fertilizer granules and solidified to form a coating layer, the fertilizer is wrapped 5 times, mixed and then air-dried or treated The biochar controlled-release fertilizer can be obtained by granulating with a granulator or mol...

Embodiment 2

[0025] Grind the dried corn stalks into particles with a diameter of 10mm, pyrolyze them for 10 hours under the condition of anoxic and 450°C to form granular biochar, and cool and grind to obtain 74um biochar powder; Put it into the blast fluidized bed, preheat to 55°C and spray 12kg of phenolic resin, so that the phenolic resin is coated on the surface of the continuously rolling fertilizer particles, and gradually wraps to form a uniform liquid layer; spray 6kg of biochar powder onto the continuously rolling fertilizer granules. Fertilizer granules, and continue to heat to keep the temperature of the material at 60 ° C. After 15 minutes of treatment, the biochar is wrapped on the moving fertilizer granules and solidified to form a coating layer. The fertilizer is wrapped 4 times, mixed and then air-dried or granulated. Machine granulation or mold compression molding to obtain biochar controlled-release fertilizer.

[0026]

Embodiment 3

[0028] Grind the dried wheat straw into particles with a diameter of 5 mm, and pyrolyze it under the condition of anoxic and 800°C for 0.5 h to form granular biochar. After cooling and grinding, 120um biochar powder is obtained; After separation, transfer to the blast fluidized bed, preheat to 65°C and spray 20kg of melamine formaldehyde resin, so that the melamine formaldehyde resin is coated on the surface of the continuously rolling fertilizer particles, and gradually wraps to form a uniform liquid layer; 15kg of biochar powder Spray on the continuous rolling fertilizer granules, and continue to heat to keep the material temperature at 70°C. Treat for 12 minutes. The biochar is wrapped on the moving fertilizer granules and solidified to form a coating layer. Wrap the fertilizer 4 times and mix it evenly. Air-dried or granulated by a granulator or molded into a mould, the biochar controlled-release fertilizer is obtained.

[0029]

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PUM

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Abstract

The invention discloses a production method of a biological carbon coated controlled-release fertilizer and belongs to the technical field of recycling of agricultural waste and soil fertilizer. The production method comprises the following steps: crushing dry biomass material, performing pyrolysis for 0.5-12 hours under an anaerobic condition at 250-800 DEG C to form biological carbon granules, and cooling and grinding to obtain biological carbon powder with the particle size of 74-180 microns; screening granular fertilizer, transferring the screened granular fertilizer into a blast fluidized bed, preheating, and then spraying a binding agent to ensure that the surface of the continuously rolling granular fertilizer is coated with the binding agent and a uniform liquid layer is formed gradually; and spraying the biological carbon powder to the continuously rolling granular fertilizer, continuously heating to keep the material temperature at 60-70 DEG C, treating for 10-15 minutes so that the moving granular fertilizer is coated with the biological carbon powder and a coating layer is formed after curing, coating the fertilizer for 2-5 times, uniformly mixing, and then performing air drying or pelleting by virtue of a pelleting machine or performing compression mold forming. The controlled-release fertilizer obtained by the method disclosed by the invention is degradable and has a good controlled release effect.

Description

technical field [0001] The invention belongs to the field of agricultural waste recycling technology and soil fertilizer technology, and in particular relates to a production method of biochar-coated controlled-release fertilizer. Background technique [0002] my country currently has 2 billion mu of arable land and needs 150 million tons of chemical fertilizers annually. It is the world's largest importer of chemical fertilizers and producer of nitrogen fertilizers. Even so, the amount of chemical fertilizers still cannot meet the needs of agricultural development. The reason is that the key problem is that the utilization rate of chemical fertilizers is too low. According to surveys, the utilization rate of chemical fertilizers in my country is only 35%-40%, and the rest is fixed by the soil, and some of them are caused by runoff, leaching, etc., causing environmental problems such as water pollution and lake eutrophication. Fertilizer is a high-energy-consuming product....

Claims

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Application Information

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IPC IPC(8): C05G3/00C05G3/08C05G3/90
CPCC05G3/90C05G5/30Y02A40/22Y02P60/21
Inventor 张均华金千瑜赵夫涛朱练峰禹盛苗
Owner CHINA NAT RICE RES INST
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