Method for directly preparing functional biochar through straw pyrolysis

A functional and biological carbon technology, applied in the field of straw treatment, can solve the problems of single performance, need to improve economic value, poor stability, etc., and achieve the effects of increasing porosity, good immobilization effect, and improving structural strength.

Inactive Publication Date: 2017-12-22
FUNAN NATURE ARTS & CRAFTS
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  • Summary
  • Abstract
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AI Technical Summary

Problems solved by technology

At present, the biocarbon materials prepared by straw pyrolysis have single properties

Method used

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Experimental program
Comparison scheme
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Embodiment Construction

[0015] A method for directly preparing functional bio-char by pyrolysis of straw adopts the following steps:

[0016] (1) First, clean and dry the harvested crop straws, then crush them into powders of ≤5mm with a crusher, then add 5% of the binder and 1.5% of the functional additives, stir evenly, and then send them to the compression device for processing. Compression treatment, prepare compressed straw materials of various shapes and sizes according to actual needs;

[0017] (2) The obtained compressed straw material is put into a retort, and the functional bio-char is obtained after pyrolysis reaction for 8 hours under the condition of inert gas atmosphere and 750 ℃.

[0018] The adhesive in step (1) is an alkaline silica sol with a pH value of 8.2 and a solid content of 25%.

[0019] The functional additive in step (1) is graphene oxide.

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Abstract

The invention discloses a method for directly preparing functional biochar through straw pyrolysis. According to the method, straw pyrolysis based preparation of biochar and functional modification treatment of the biochar are integrated, straw is firstly smashed into powder in the pyrolysis process, a binding agent and a functional aid are added, all materials are mixed, and then a mixture is subjected to compressive granulation by a compression device and pyrolytic carbonization treatment is performed, wherein the binding agent not only has the auxiliary molding effect, but also increases porosity of the biochar and improves structural strength of the biochar; the functional aid is subjected to multiple chemical reactions with raw materials such as a biomass matrix, the binding agent and the like in the carbonization process, organic combination of functional components and the biochar is realized, a good immobilization effect is achieved, and a finally prepared functional biochar material has broad application prospect in the fields of wastewater treatment, soil remediation, anti-bacteria, catalysis and the like; the preparation method is simple and efficient, and high-value utilization of the straw is realized.

Description

technical field [0001] The invention relates to the technical field of straw treatment, in particular to a method for directly preparing functional biochar by pyrolysis of straw. Background technique [0002] my country is a big country producing straw, and there are nearly 30 kinds of straw. However, a large amount of straw is discarded and incinerated, and has not been well reused, which not only wastes resources but also causes environmental pollution. In recent years, with the depletion of fossil energy and the deterioration of environmental conditions, the comprehensive utilization of straw resources has become a topic of increasing concern. [0003] The straw pyrolysis and carbonization technology is a type of straw utilization technology developed in recent years. The biochar produced by straw carbonization can not only greatly improve soil fertility, but also cultivate fertile high-carbon storage soil on barren soil. The effect is to significantly improve the yield...

Claims

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Application Information

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IPC IPC(8): C01B32/05
Inventor 杨毅
Owner FUNAN NATURE ARTS & CRAFTS
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