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Carbon-based slow-release fertilizer coated with bio-oil film

A bio-oil and bio-char technology, applied in layered/coated fertilizers, nitrogen fertilizers, potash fertilizers, etc., can solve the problem of not fully exerting the slow-release ability of biochar, limited slow-release ability of carbon-based slow-release fertilizers, and increasing crop absorption, etc. problems, to achieve the effect of improving nutrient utilization, reducing nutrient loss, and prolonging fertilizer efficiency period

Inactive Publication Date: 2019-08-09
谭中欣 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Biochar is a solid material formed by thermochemical conversion of biomass under oxygen-limited conditions, which has high aromaticity and strong stability. Among them, biochar is due to its rich pore structure and huge specific surface area. It has great potential as a fertilizer carrier, and can better solve the above-mentioned problems of large loss of N, P, and K fertilizers, and increase the absorption of crops. However, the common practice of carbon-based slow-release fertilizers on the market is to Simple mixing of biochar and fertilizer, the slow-release ability of this simple carbon-based slow-release fertilizer is very limited, and the slow-release ability of biochar as a carbon substrate has not been fully utilized

Method used

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  • Carbon-based slow-release fertilizer coated with bio-oil film
  • Carbon-based slow-release fertilizer coated with bio-oil film

Examples

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Embodiment 1

[0027] Embodiment 1: A kind of oil-coated carbon-based slow-release fertilizer

[0028] It comprises 80-120 parts by mass of biochar, 15-22 parts by mass of potassium nitrate, 4-9 parts by mass of potassium dihydrogen phosphate, 1-3 parts by mass of potassium chloride, and 60-90 parts by mass of bio-oil.

[0029] Both the biochar and bio-oil come from the pyrolysis process of wheat straw, which has an yield of about 600kg per mu, and contains rich N, P, K nutrients and good fiber structure.

[0030] In the pyrolysis process, the initial pyrolysis temperature is set to 20°C, the heating rate is 20°C / min, the target temperature is 400°C, the residence time at the target temperature is 2h, and the pyrolysis inert gas is CO 2 , N 2 Or water vapor, the gas flow rate is 20ml / min, so that the straw is pyrolyzed to prepare initial biochar and ground through a 1mm sieve to make the particle size uniform.

Embodiment 2

[0031] Embodiment 2: A combination of oil-coated carbon-based slow-release fertilizers. The composition of the new carbon-based slow-release fertilizer fertilizer body is composed of the above-mentioned components, and is wrapped with bio-oil film after absorbing nutrients with biochar form combination.

Embodiment 3

[0032] Embodiment 3: a kind of preparation process of oil-coated carbon-based slow-release fertilizer, the final product of this process is the slow-release fertilizer body described in Example 2, which includes:

[0033] (1) Collect wheat straw and dry it at 60°C for pretreatment;

[0034] (2) Add the dried straw into the pyrolysis tube 7 from the feeding port 5, set the initial pyrolysis temperature to 20°C, the heating rate to 20°C / min, and the target temperature to 400°C through the three-stage temperature control system 4. The temperature residence time is 2h, open the gas valve 1, pass the N 2 or CO 2 Gas cylinder 2 feeds inert gas CO into pyrolysis tube 6 2 or N 2 , the gas flow rate is controlled to 20ml / min by the flow meter 3, so that the straw is pyrolyzed to prepare initial biochar and ground through a 1mm sieve to make the particle size uniform;

[0035] (3) Combine the initial biochar and KH 2 PO 4 and KNO 3 The solution is mixed in a certain ratio, and th...

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Abstract

The invention discloses a carbon-based slow-release fertilizer coated with bio-oil film and compositions, combination mode and preparation process of a carbon-based slow-release fertilizer body coatedwith the bio-oil film. The slow-release capacity of the carbon-based slow-release fertilizer coated with the bio-oil film is further improved relative to common carbon-based fertilizers, the nutrientloss rate is reduced to a greater degree, and the yield of crops is increased. In the preparation process of the carbon-based slow-release fertilizer coated with the bio-oil film, wheat straw resources are fully and reasonably utilized, and the carbon-based slow-release fertilizer coated with the bio-oil film meets the green and sustainable development concept. The novel carbon-based slow-releasefertilizer is prepared from, by mass, 80-120 parts of biochar, 15-22 parts of potassium nitrate, 4-9 parts of monopotassium phosphate, 1-3 parts of potassium chloride and 60-90 parts of bio-oil. Thestructure of the novel carbon-based slow-release fertilizer is in a cylindrical particle shape.

Description

technical field [0001] The invention relates to the technical field of slow-release fertilizers, in particular to a bio-oil-coated carbon-based slow-release fertilizer, the components of the bio-oil-coated carbon-based slow-release fertilizer, a combination method, and a preparation process. Background technique [0002] N, P, and K in fertilizers are the three main nutrient elements necessary for the growth and development of crops. However, due to the soluble properties of today's commercial fertilizers, the release rate of N, P, and K nutrients per unit time is much greater than the absorption rate of crops. It has caused problems such as low crop nutrient utilization rate, crop quality and yield decline, waste of resources, and environmental pollution. For example, proper supply of N nutrients can promote plant growth and increase yield, but excessive and inappropriate N supply can cause nitrate accumulation in crops, which is harmful to human health. Generally, cereals...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00
CPCC05B7/00C05G5/30C05C5/02C05D1/02C05D9/00
Inventor 谭中欣叶志雄
Owner 谭中欣
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