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Preparation method and product of bio-carbon composite material

A composite material and biochar technology, which is applied in the direction of carbon preparation/purification, etc., can solve the problems that it is difficult to prepare highly water-absorbent biochar materials, and needs to be improved, so as to facilitate repair, low cost, and easy industrialization and commercialization The effect of production

Inactive Publication Date: 2017-06-20
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

However, the technology of using agricultural biomass to prepare biochar materials still has the following problems: 1. The highly water-absorbing biochar material can effectively retain the moisture in the soil, which is one of the important factors determining the effect of soil improvement; The physical and chemical properties of different types of agricultural biomass are different. For some types of agricultural biomass such as cotton stalks, it is difficult to prepare highly water-absorbing biochar materials, and the water absorption of biochar prepared from other types of agricultural biomass also needs to be improved; 2. Specific surface area and porosity It determines the adsorption capacity of biochar and its effect on soil restoration. Due to the different physical and chemical characteristics of each agricultural biomass straw, it is difficult to prepare high Biochar materials with specific surface area and porosity, the specific surface area and porosity of biochar prepared from other types of agricultural biomass also need to be improved

Method used

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  • Preparation method and product of bio-carbon composite material
  • Preparation method and product of bio-carbon composite material

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preparation example Construction

[0025] The invention provides a kind of preparation method of biochar composite material, comprises the steps:

[0026] (1) Wheat straw is used as the main ingredient, and at least two kinds of corn stalks, rice stalks and cotton stalks are used as auxiliary materials, and the mass percentages of each component are: 50-60% of wheat stalks, and no more than 36% of corn stalks %, rice stalk is not higher than 28%, cotton stalk is not higher than 16%;

[0027] (2) Drying the selected main and auxiliary materials, then pulverizing, mixing the main and auxiliary materials, and sealing and storing for a period of time;

[0028] (3) Carrying out anaerobic pyrolysis of the mixture obtained in the step (2) under the protection of an inert gas, and then cooling to room temperature in an inert gas atmosphere;

[0029] Based on the above method, a variety of agricultural biomass is selected as a raw material and subjected to anaerobic pyrolysis treatment after crushing to obtain a biocha...

Embodiment 1

[0033] The biochar composite material was prepared according to the above preparation method, and the specific parameters were as follows: Four agricultural biomasses of wheat straw, corn stalk, rice stalk and cotton stalk were selected as raw materials, and the mixed mass percentages were 50% of wheat straw, 24% of corn stalk, Rice stalk 18% and cotton stalk 8%; the four agricultural biomasses of wheat stalk, corn stalk, rice stalk and cotton stalk are dried to a water content of 6%-10%, and the particle size of the raw material after crushing and screening is below 0.25mm , sealed and stored at 25°C for 30 days, the pyrolysis temperature was 550°C, the pyrolysis reaction time was 30min, and the oxygen-free protective gas N 2 The air velocity is 0.32m / s. In this way, biochar composite materials were prepared.

[0034] For the obtained above-mentioned biochar composite material, figure 1 and figure 2 A comparison of three performance parameters of the biochar composite mat...

Embodiment 2

[0036] The biochar composite material was prepared according to the above preparation method, and the specific parameters were as follows: Three kinds of agricultural biomass of wheat straw, corn stalk and cotton stalk were selected as raw materials, and the mixed mass percentages were 55% of wheat straw, 36% of corn stalk and 9% of rice stalk. %; wheat straw, corn stalk and rice straw are three kinds of agricultural biomass dried to a moisture content of 6%-10%. The temperature is 500°C, the pyrolysis reaction time is 40min, and the oxygen-free protective gas N 2 The air velocity is 0.25m / s. In this way, biochar composite materials were prepared.

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Abstract

The invention relates to the technical field of bio-carbon materials, and specifically relates to a preparation method and a product of a bio-carbon composite material. The preparation method comprises the following steps: (1) using 50 to 60% by mass of wheat straw as a main material, and at least two of less than 36% by mass of corn stalks, less than 28% by mass of rice straw and less than 16% by mass of cotton stalks as auxiliary materials; (2) drying the selected main material and auxiliary materials and then crushing, mixing the main and auxiliary materials, and sealing and storing for a period of time; (3) subjecting a mixture obtained in step (2) to anaerobic pyrolysis under the protection of an inert gas and then cooling to room temperature in an inert gas atmosphere. The bio-carbon composite material having improved properties such as water absorption, specific surface area and porosity is obtained by the mode. In addition, the preparation method of the bio-carbon composite material has the advantages of simple process, low cost and easy industrialized production.

Description

technical field [0001] The invention belongs to the technical field of biochar materials, and in particular relates to a preparation method of a biochar composite material and a product thereof. Background technique [0002] Biochar (biochar) is a solid product of biomass after pyrolysis in an oxygen-free or low-oxygen environment, which has a well-developed pore structure, a high specific surface area and an aromatic structure. Biochar (biochar) is mainly used as a soil improver and absorbent for agricultural and forestry soils. It can improve soil physical and chemical properties, absorb polluting elements in soil, realize soil carbon fixation and repair polluted soil, solve soil ecological problems, and improve crop quality. quality and reduce greenhouse gas emissions. [0003] my country produces a large amount of agricultural biomass every year, among which wheat straw, corn stalk, rice stalk and cotton stalk have the largest output. However, the utilization rate of ag...

Claims

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Application Information

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IPC IPC(8): C01B32/05
CPCC01P2006/12C01P2006/82
Inventor 陈汉平林贵英张雄梅艳阳刘英鹏杨海平邵敬爱王贤华张世红
Owner HUAZHONG UNIV OF SCI & TECH
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