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High-activity straw biochar and preparation method thereof

A technology of straw biology and high activity, applied in chemical instruments and methods, carbon compounds, inorganic chemistry, etc., can solve the problems of difficult control of pore structure, high equipment corrosion, high activation temperature, etc. The effect of low cost and simple process

Pending Publication Date: 2020-09-11
INST OF PLANT NUTITUION & RESOURCE ENVIRONMENT HENAN ACADEMY OF AGRI SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The activation method is mainly divided into physical activation and chemical activation. The physical activation method is to use CO in a high temperature and oxygen-free environment. 2 Or water vapor treatment of biochar, so as to open and expand biochar; physical activation method has little environmental pollution and simple production process, but the activation temperature is high, equipment investment is large, yield is low, and the pore structure is difficult to control
The chemical activation method is to mix and impregnate chemicals with dehydration and erosion effects with the raw materials for a period of time and then conduct heat treatment. The hydrogen and oxygen in the raw materials are decomposed and separated in the form of water. At the same time, carbonization and activation are carried out. Common chemical activators include ZnCl 2 , KOH, K 4 P 2 o 7 、K 2 CO 3 、H 3 PO 4 etc.; although the activation temperature of the chemical activation method is low, the yield is low, the cost is high, the equipment is highly corrosive, and it is easy to cause secondary pollution and the process is complicated

Method used

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  • High-activity straw biochar and preparation method thereof
  • High-activity straw biochar and preparation method thereof
  • High-activity straw biochar and preparation method thereof

Examples

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Effect test

Embodiment 1

[0031] A method for preparing high-activity straw biochar, the preparation steps are as follows:

[0032] S1, take 2000g of wheat straw, put it in a cool and dark place to dry naturally, control the moisture content to less than 15%, pass it through a 20-mesh sieve after crushing, then add 20g of potassium pyrophosphate aqueous solution with a mass fraction of 60%, and add 100g of carboxymethyl Sodium cellulose to obtain straw mixture;

[0033] S2, putting the straw mixture obtained in S1 in a water bath at 80° C. for 1 hour, stirring it in a small mixer (YB05) for 1 hour, and then molding it in a molding machine with a pressure of 5 kPa to obtain activated wheat straw;

[0034] S3, the activated wheat straw obtained in S2 was placed in a pyrolysis furnace (BC10), the pyrolysis temperature was 350°C, the heating rate was 5°C / min, and the holding time was 2h. Take it out after cooling down to room temperature to obtain straw biochar with high activity.

Embodiment 2

[0036] A method for preparing high-activity straw biochar, the steps of which are basically the same as those in Example 1, the difference being that in S1, crushed wheat straw is passed through a 50-mesh sieve, and 100 g of potassium pyrophosphate aqueous solution with a mass fraction of 50% is added;

[0037] In S2, the water bath temperature is 85°C, the water bath time is 1.5h, the stirring time is 50min, and the molding machine pressure is 8kPa;

[0038] In S3, the pyrolysis temperature is 450°C, the heating rate is 3°C / min, and the holding time is 4h.

Embodiment 3

[0040] A method for preparing high-activity straw biochar, the steps of which are basically the same as in Example 1, the difference being that in S1, crushed wheat straw is passed through a 100-mesh sieve, and 200 g of potassium pyrophosphate aqueous solution with a mass fraction of 30% is added;

[0041] In S2, the water bath temperature is 90°C, the water bath time is 2h, the stirring time is 40min, and the molding machine pressure is 10kPa;

[0042] In S3, the pyrolysis temperature is 550°C, the heating rate is 5°C / min, and the holding time is 6h.

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Abstract

The invention relates to the field of biochar preparation methods, and particularly discloses a preparation method of high-activity straw biochar, which comprises the following steps: S1 to S2, activating straws, and S3, pyrolyzing the activated straws to obtain the high-activity straw biochar. The high-activity straw biochar prepared by the invention can improve the yield, specific surface area and porosity of a biochar product, and is a low-cost, ecological and environment-friendly preparation process.

Description

technical field [0001] The invention relates to the field of biochar preparation methods, in particular to a highly active straw biochar and a preparation method thereof. Background technique [0002] Straw resources are the most important part of agricultural waste resources. China's agricultural production activities will produce a large amount of straw every year, and the output of straw can reach more than 800 million tons, of which the straw of field crops is the main one. Except for a small part used for papermaking, energy and livestock feeding, most of them are directly returned to the field to improve soil organic matter and improve soil. However, a large number of studies have found that the ability of straw returning to the field to improve soil organic carbon is very limited. 2 The organic carbon content stored in the farmland soil is very small, which greatly reduces the carbon sequestration effect of the straw and limits the further improvement of the ecologi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/348C01B32/324
CPCC01B32/348C01B32/324
Inventor 吕金岭秦胜涛寇长林
Owner INST OF PLANT NUTITUION & RESOURCE ENVIRONMENT HENAN ACADEMY OF AGRI SCI
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