Biomass charcoal based urea and preparation method for biomass charcoal based urea

A technology based on urea and biochar, applied in fertilizer mixtures, fertilization devices, applications, etc., can solve problems such as lake eutrophication and water pollution, and achieve the effects of improving soil, saving energy in the production process, and reducing fertilizer leaching and waste.

Inactive Publication Date: 2012-10-03
SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to surveys, the utilization rate of chemical fertilizers in my country is only 35%-40%, and the rest is fixed by the soil, or leached to cause environmental problems such as water pollution and eutrophication of lakes.
In addition, chemical fertilizer is a high-energy-consuming product. Due to the impact of rising raw material prices and environmental pollution, many small chemical fertilizer plants are on the verge of closing down. However, due to economic and energy constraints, the country is currently unable to transform these chemical fertilizer plants. The increase in the total amount of fertilizer in my country

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1. Using local agricultural waste, such as salix stubble, corn, rice, wheat, soybean, straw and other biomass energy as raw materials, the raw materials are crushed, dried and then carbonized at low temperature to form 40kg of porous biomass carbon black;

[0026] 2. With biomass carbon black as the core, 50kg of urea is mixed in. The total nitrogen (N) in the urea (on a dry basis) is 47%, and the moisture (H 2 O)≤1%;

[0027] 3. Add 10kg of attapulgite binder, and granulate in the organic and inorganic fertilizer granulator, wrap the granulated material into the dryer for drying, and obtain 95kg of granular biochar-based urea after cooling and screening, of which the N content is 23%, biochar is 29%, and organic matter content is 21%.

Embodiment 2

[0029] 1. Using local agricultural waste, such as salix stubble, corn, rice, wheat, soybean straw and other biomass energy as raw materials, the raw materials are crushed, dried, and then carbonized at low temperature to form 50kg of porous biomass carbon black;

[0030] 2. With biomass carbon black as the core, 65kg of urea is mixed in. The total nitrogen (N) in the urea (calculated on a dry basis) is 46%, and the moisture (H 2 O)≤1%;

[0031] 3. Add 12kg of oxidized starch binder and granulate in an organic and inorganic fertilizer granulator. The wrapped and granulated material is dried in a dryer, cooled and sieved to obtain 123kg of granular biochar-based urea, of which the N content is 25%, biochar is 28%, and organic matter content is 22%.

Embodiment 3

[0033] 1. Using local agricultural waste, such as salix stubble, corn, rice, wheat, soybean straw and other biomass energy as raw materials, the raw materials are crushed, dried, and then carbonized at low temperature to form 38kg of porous biomass carbon black;

[0034] 2. With biomass carbon black as the core, 48kg of urea is mixed in. The total nitrogen (N) (on a dry basis) in the urea is 46%, and the moisture (H 2 O)≤1%;

[0035] 3. Add 8kg of oxidized starch binder, and granulate in the organic and inorganic fertilizer granulator, and the wrapped and granulated material enters the dryer for drying, and 123kg of granular biochar-based urea is obtained after cooling and screening, of which the N content is 25%, biochar is 28%, and organic matter content is 22%.

[0036] Beneficial effects of the present invention are further elaborated below by test example:

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Abstract

The invention discloses a biomass charcoal based urea which mainly comprises of biomass carbon black and urea. The biomass carbon black is prepared by using agricultural wastes as a biomass material for low-temperature carbonization to form porous biomass carbon black. By using microporous biomass carbon, the biomass carbon based urea has strong adsorption capacity and pretty good light absorbance and warming effects. The biomass carbon based urea has very good slow release ability to effectively reduce leaching loss and waste of the fertilizer, can be preserved for a long time at the normal temperature, and can also be mixed with other organic or inorganic fertilizers for granulating and drying without being affected but with remarkably increased fertilizer effect.

Description

technical field [0001] The invention relates to a nitrogen fertilizer, in particular to a biochar-based urea; in addition, the invention also relates to a preparation method of the biochar-based urea. Background technique [0002] my country is a country with a large population and a large agriculture. It uses 7% of the world's land to feed 22% of the world's population. The food issue is always a major issue related to the national economy and people's livelihood. my country has 2 billion mu of arable land and needs 150 million tons of fertilizers annually. It is the world's largest importer of 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, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00C05G3/04C05G3/80
Inventor 潘文灏孔芳芳王奕然吴瑞斌
Owner SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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