Biocharcoal-based slow release fertilizer and preparation method thereof

A biochar, slow-release fertilizer technology, applied in nitrogen fertilizers, fertilization devices, fertilizer mixtures, etc., can solve the problems of slow release, refractory polymer degradation, polluted soil, etc., to delay release and diffusion, enrich surface functional groups, improve Effects of Soil Quality

Active Publication Date: 2018-07-24
HUNAN AGRICULTURAL UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the current slow / controlled release fertilizers still have problems such as high production costs, high market prices, and high technical requirements, which are not conducive to marketing and promotion. Some high polymers are difficult to degrade and will pollute the soil. Damaged, relatively high requirements for storage and transportation conditions
For example, most of the current slow / controlled release fertilizers use coating or coating technology to block the release of fertilizers into the soil by coating the surface of the fertilizer with hydrophobic materials, but the coating and coating are easily damaged, and the coating is easy to wear during transportation. Moreover, the release of the coating is very slow before decomposition or dissolution, and a large amount of concentrated release after decomposition does not help the efficient use of fertilizers, but increases the cost

Method used

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  • Biocharcoal-based slow release fertilizer and preparation method thereof
  • Biocharcoal-based slow release fertilizer and preparation method thereof

Examples

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Effect test

Embodiment 1

[0031] A biochar-based slow-release fertilizer of the present invention, the raw materials of which include the following components: rapeseed stalks, urea and water. Its preparation method comprises the following steps:

[0032] (1) Dry the rapeseed stalks, crush them to a particle size of 100 mesh by crushing equipment, and place them in a carbonization furnace under nitrogen protection for pyrolysis and carbonization. The pyrolysis and carbonization temperature is 400°C, and the pyrolysis and carbonization time is 3 hours. , after the carbonization is completed, take it out and dry it to obtain biochar;

[0033] (2) Mix the biochar powder and urea obtained after the step (1) with 20g and 5g respectively and add into 100ml of distilled water, stir and mix evenly, place in a 300ml closed reaction kettle, heat to 135°C, and keep warm for 3h, Carry out hydrothermal reaction, cool naturally to room temperature after the reaction is completed, take out the black product in the r...

Embodiment 2

[0035] A biochar-based slow-release fertilizer of the present invention, the raw materials of which include the following components: rapeseed stalks, urea and water. Its preparation method comprises the following steps:

[0036] (1) Dry the rapeseed stalks, crush them to a particle size of 100 mesh by crushing equipment, and place them in a carbonization furnace under nitrogen protection conditions for pyrolytic carbonization. The pyrolytic carbonization temperature is 700°C, and the pyrolysis carbonization time is 3 hours. , after the carbonization is completed, take it out and dry it to obtain biochar;

[0037] (2) Mix the biochar powder and urea obtained after the step (1) with 20g and 10g respectively and add into 100ml of distilled water, stir and mix evenly, place in a 300ml airtight reaction kettle, heat to 165°C, keep warm for 3h, Carry out hydrothermal reaction, cool naturally to room temperature after the reaction is completed, take out the black product in the rea...

Embodiment 3

[0039] A biochar-based slow-release fertilizer of the present invention, the raw material includes the following components: rape straw, potassium hydroxide, urea and water. Its preparation method comprises the following steps:

[0040] (1) Dry the rapeseed stalks, crush them to a particle size of 100 mesh by crushing equipment, and place them in a carbonization furnace under nitrogen protection for pyrolysis and carbonization. The pyrolysis and carbonization temperature is 400°C, and the pyrolysis and carbonization time is 3 hours. , after the carbonization is completed, take it out and dry it to obtain biochar;

[0041] (2) Fully grind and mix 5 g of the biochar obtained after the step (1) with 10 g of potassium hydroxide, place it under nitrogen protection conditions for pyrolysis activation, the activation temperature is 700 ° C, and the activation time is 3 hours. Rinse with distilled water until neutral to obtain a black product, and dry to obtain activated biochar with...

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Abstract

The invention discloses biocharcoal-based slow release fertilizer. The biocharcoal-based slow release fertilizer is prepared from biocharcoal and chemical fertilizer with the mass ratio being 20:(5 to10). The biocharcoal-based slow release fertilizer disclosed by the invention has the beneficial effects that agricultural and forest wastes such as straws with wide distribution, large yield and lowcost are adopted as biomass, has rich pore channels, is easily decomposed, is not deteriorated after being absorbed, is wear-resistant, and also has excellent adsorbing and ion-exchange properties, the fertility, the structure and microorganisms and the like of soil can be effectively improved, and the soil quality can be improved; shown from the cumulative released amount of nitrogen of the biocharcoal-based slow release fertilizer in water, the cumulative released amount of the nitrogen in 480 hours is about 80%, i.e., the cumulative released amount of nitrogen nutrients in 20 days is 80%.The invention also discloses a preparation method of the biocharcoal-based slow release fertilizer. The preparation method adopts a hydrothermal method to prepare the biocharcoal-based slow release fertilizer, the technology is manure, the operation is convenient, simple and easy, low cost, less investment and low energy consumption are achieved, and an economic and feasible technical means is provided for large-scale application of the biocharcoal-based slow release fertilizer.

Description

technical field [0001] The invention belongs to the technical field of fertilizers, in particular to a biochar-based slow-release fertilizer and a preparation method thereof. Background technique [0002] Food is a necessity for human life and is related to social stability and development. In agricultural production, farmers usually increase the application of chemical fertilizers in order to increase the yield of crops. However, excessive use of chemical fertilizers not only fails to increase crop yields, but also increases costs, resulting in a large waste of resources and serious environmental pollution, such as soil acidification, water eutrophication, greenhouse gas and other air pollution, resulting in a series of ecological, social and economic question. In order to improve the utilization efficiency of chemical fertilizers and increase crop yields, research and design fertilizers that can release nutrients according to the law of crop fertilizer requirements, and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/04C05G3/80
CPCC05C9/00C05G3/80C05D9/00
Inventor 张振华刘向荣肖和友邓建功廖佳元宋海星于庆涛
Owner HUNAN AGRICULTURAL UNIV
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