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Production method of biological charcoal based slow-release compound fertilizer

A slow-release compound fertilizer and biochar technology, applied in chemical instruments and methods, nitrogen fertilizers, potash fertilizers, etc., can solve the problems of poor application effect and single nutrient elements, and achieve the effects of low cost, abundant resources, and improved fertilizer efficiency.

Inactive Publication Date: 2019-02-12
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The object of the present invention is to provide a kind of biochar-based slow-release compound fertilizer and its production method, which can have the effects of soil improvement such as conventional biochar fertilizer slow-release and carbon fixation, and solve the problem of single nutrient elements in existing biochar-based fertilizers. The application effect is poor, and it needs to be rinsed to remove the activator and adjust the pH value, which will cause problems such as rinsing sewage

Method used

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  • Production method of biological charcoal based slow-release compound fertilizer
  • Production method of biological charcoal based slow-release compound fertilizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A biochar-based slow-release compound fertilizer and a production method thereof, the specific steps are as follows:

[0028] (1) Dry the crop stalks as the biomass raw material at 70° C., and crush them to a particle size of 1 mm.

[0029] (2) Mix the above-mentioned biomass raw material with a mixed activator, and soak for 2 hours. The mixed activator is a combination of three agents including ammonium chloride, phosphoric acid, and potassium sulfate. The mass ratio of the three agents to the biomass raw material is It is 2:0.8:0.6:1.

[0030] (3) After the impregnated biomass was heated and dried, it was carbonized in a protective atmosphere at 200°C for 1 hour, and then activated in a protective atmosphere at 500°C for 4 hours, with a heating rate of 10°C / min.

[0031] (4) Cool the activated biomass to room temperature under a protective atmosphere (water vapor) to obtain the product.

Embodiment 2

[0033] A biochar-based slow-release compound fertilizer and a production method thereof, the specific steps are as follows:

[0034] (1) Dry the biomass raw materials (wood chips and bagasse) at 80°C and crush them to a particle size of 2mm.

[0035] (2) Mix the above-mentioned biomass raw material with a mixed activator, and soak for 5 hours; the mixed activator is a combination of three agents including ammonium chloride, phosphoric acid, and potassium sulfate, and the mass ratio of the three agents to the biomass raw material is It is 1:0.4:0.3:1.

[0036] (3) After the impregnated biomass was heated and dried, it was carbonized in a protective atmosphere at 300°C for 2 hours, and then activated in a protective atmosphere at 600°C for 3 hours, with a heating rate of 12°C / min.

[0037] (4) Cool the activated biomass to room temperature under a protective atmosphere (water vapor and carbon dioxide) to obtain the product.

Embodiment 3

[0039] A biochar-based slow-release compound fertilizer and a production method thereof, the specific steps are as follows:

[0040] (1) Dry the biomass raw material (straw) at 120°C and crush it to a particle size of 5mm.

[0041] (2) Mix the above-mentioned biomass raw materials with a mixed activator, and soak for 12 hours. The mixed activator is a combination of ammonium chloride and phosphoric acid, and the mass ratio of the two kinds of medicaments to the charcoal is 4:2:1 .

[0042] (3) After the impregnated biomass was heated and dried, it was carbonized in a protective atmosphere at 400°C for 3 hours, and then activated in a protective atmosphere at 700°C for 2 hours, with a heating rate of 15°C / min.

[0043] (4) Cool the activated biomass to room temperature under a protective atmosphere (nitrogen) to obtain the product.

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Abstract

The invention discloses a preparation method of biological charcoal based slow-release compound fertilizer and belongs to the technical field of fertilizer preparation. The method disclosed by the invention comprises the following steps: after drying a biomass raw material and crushing to certain granularity, immersing the biomass raw material in a mixed activating agent which has an activating effect and also contains chemical fertilizer effective elements including nitrogen, phosphorus and potassium and the like for 1 to 12h; then heating and drying the immersed biomass; carbonizing and activating in sequence under a protection atmosphere; finally, cooling to room temperature under the protection atmosphere, so as to obtain the biological charcoal based slow-release compound fertilizer.The biological charcoal based slow-release compound fertilizer provided by the invention contains various nutrient elements, and also can supply the needed nutrient elements to crops for long time ina relatively balanced manner, so that the application effect is increased; the biological charcoal based slow-release compound fertilizer also has soil improvement functions including conventional biological charcoal slow release, carbon fixation and the like; processes of bleaching to remove the activating agent, regulating the pH (Potential of Hydrogen) value and the like are not needed and bleaching sewage is not generated; a production technology is extremely simplified and the production cost is reduced.

Description

technical field [0001] The invention relates to a preparation method of biochar-based slow-release compound fertilizer, which belongs to the technical field of fertilizer preparation. Background technique [0002] Chemical fertilizer is an important means of agricultural production. The amount of chemical fertilizer used per unit area in my country is relatively high, but the utilization rate of chemical fertilizer has always been low. Nitrogen is 30% to 35%, phosphorus is 10% to 20%, and potassium is 30% to 35%. Cause direct economic losses, and the problem of environmental pollution caused by improper fertilization is also more serious. The role of slow and controlled release fertilizers in improving nitrogen use efficiency, reducing soil nitrate nitrogen accumulation, and reducing nitrate pollution in groundwater has received widespread attention. However, traditional slow and controlled release fertilizers are mainly composed of sulfur coating, polyolefin, water emulsion ...

Claims

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Application Information

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IPC IPC(8): C05G3/04C01B32/324C01B32/342C01B32/348C05G3/80
CPCC01B32/324C01B32/342C01B32/348C05B17/00C05G3/80C05C3/00C05D1/02C05D9/00
Inventor 田森林徐琳桢李英杰黄建洪胡学伟宁平
Owner KUNMING UNIV OF SCI & TECH
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