Preparation method of novel biochar

Abstract

The invention relates to a preparation method of novel biochar, which comprises following steps: (1) crushing plant straws into powder, soaking the plant straws and soaking the plant straws in an ammonium acetate water solution at normal temperature, and cooking the plant straws in a mixed liquid prepared from oxalic acid, sodium nitrate, tannin acid and water; (2) washing filter residue in clear water to remove acid on surface of the plant straw powder; (3) cooking the filtrate; (4) mixing a solid substance obtained in the step (3) with carbon powder according to the weight ratio of 100:2.5 uniformly and performing high-temperature treatment; (5) mixing the treated raw materials with activated charcoal according to the weight ratio of 60:2 uniformly, and performing carbonization treatment with nitrogen gas filled into a quartz tube continuously so that the nitrogen gas is circulated in the quartz tube to prepare the biochar. The method for producing the biochar can reach more than 64.5% in carbonization rate of the plant straws, and is reduced by about 10% in energy consumption during the process.

Description

technical field [0001] The invention belongs to the field of material processing, and in particular relates to a preparation method of novel biochar. Background technique [0002] Recently, scientists have turned their attention to biochar, and have germinated the idea of ​​creating "technological soil", hoping to solve the current climate change, energy, food and water resource crises by increasing the inherent organic carbon storage of the soil. [0003] In recent years, with global climate change, greenhouse gas emissions, and soil degradation of cultivated land, the living environment and space for human beings have become increasingly severe. Stuck". [0004] Biochar can not only greatly improve soil fertility, but also cultivate fertile high-carbon pool soil on barren soil. The most direct effect is to significantly improve crop yield and quality, and it can also indirectly reduce the application of chemical fertilizers, pesticides and other chemicals. The most impor...

AI Technical Summary

Problems solved by technology

However, because the current land policy in our country divides the production unit too small, it is not conducive to the use of straw returning machinery

The very different climatic conditions also limit the scope of application of straw returning to the field, resulting in less than 1 / 3 of the straw returning to the field in my country, but more than 50% of the straw is burned or discarded.

A large amount of greenhouse gases and soot emitted by straw burning lead to a series of environmental problems such as the decline of air quality, the induction of urban haze, and the impact of flight take-off and landing.

[0007] However, when biochar is processed now, the carbonization rate is not high, often below 40%. At the same time, the carbonization temperature of the existing technology is relatively high, and the energy loss is relatively large.

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