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Biochar and preparation method

A technology of biochar and plant straw, which is applied in the field of biochar and its preparation, can solve the problems of large specific surface area, single source of bio-black carbon, different effect of increasing soil fertility and passivation of heavy metals, etc.

Inactive Publication Date: 2015-07-15
HUNAN TAIGU BIOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the sources of these bio-black carbons are mostly single, and there are large differences in the temperature of burning bio-black charcoal from various sources (ranging from 300 degrees Celsius to 750 degrees Celsius).
Moreover, there are significant differences in the effects of biochar from different sources after being applied to soil. For example, biochar from plants has a larger specific surface area than biochar from animals, and it has a better effect on soil structure improvement and heavy metal adsorption, while animal-derived biochar has a better effect on soil structure improvement and heavy metal adsorption. The ash content of the source biochar is significantly higher than that of the plant source biochar, and the effect on soil fertilization and crop yield increase is more obvious
As a result, the effects of these different sources of black carbon on soil fertility improvement, yield increase and heavy metal passivation are also significantly different.

Method used

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  • Biochar and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1. Collect plant-sourced biochar (rice straw), chop it and air-dry it to ensure that its moisture content is less than 20%. Collect animal-derived biochar (pig manure), air-dry and mix to ensure that its moisture content should be lower than 40%.

[0019] 2. Mix the rice straw and pig manure according to the weight ratio of 2:1, and put it in the furnace (half the volume).

[0020] 3. Carry out high-temperature anaerobic firing at 500 degrees Celsius for 10 hours.

Embodiment 2

[0022] 1. Collect plant-sourced biochar (rice straw), chop it and air-dry it to ensure that its moisture content is less than 20%. Collect animal-derived biochar (pig manure), air-dry and mix to ensure that its moisture content should be lower than 40%.

[0023] 2. Mix rice straw and pig manure according to the weight ratio of 2:1, and load the furnace (full). 3. Carry out high-temperature anaerobic firing at 550 degrees Celsius for 20 hours.

experiment example 1

[0024] Experimental Example 1 Optimization of Proportion

[0025] In this experimental example, by adjusting the ratio of plant straw and animal manure, the specific surface area, pore volume and ash content of biochar fired at different ratios were compared (see Table 1).

[0026] It was found that the specific surface area of ​​the biochar product obtained was 60-100m2 when plant straw and animal manure were anaerobically fired at 500-550 degrees Celsius for 10-20 hours at a weight ratio of 2:1. 2 / g, the pore volume is 0.04-0.08cm 3 / g, the ash content is 55-60%, obviously better than the ratio of 1:1 and 1:2. At the same time, compared with the black carbon derived from straw in the prior art, although its specific surface area and pore volume have decreased by 25% and 20%, its ash content has increased by 66.7%; compared with black carbon derived from pig manure, although its ash content has decreased 15.4%, but its specific surface area and pore volume increased by 50%...

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Abstract

The invention relates to the field of biomass processing, and specifically provides biochar and a preparation method thereof. According to the invention, plant straw and animal feces with a weight ratio of 2:1 are subjected to anaerobic firing for 10-20h under a temperature of 500-550 DEG C, such that the biochar is obtained. Compared with straw-sourced black charcoal in prior arts, although the specific surface area and pore volume are respectively reduced by 25% and 20%, the ash content is increased by 66.7%. Compared with pig-feces-sourced black charcoal, although the ash content is reduced by 15.4%, the specific surface area and the pore volume are respectively increased by 50% and 122%.

Description

technical field [0001] The invention relates to the field of biomass processing, in particular to a biochar and a preparation method thereof. Background technique [0002] Biochar currently on the market is mainly divided into plant-derived biochar and animal-derived biochar. Although both types of biochar can achieve the purpose of improving soil structure, improving soil fertility and increasing crop yield, some studies have shown that in At the same temperature, due to the influence of structural composition and nutrient content, the specific surface area of ​​plant-derived biochar is larger than that of animal-derived biochar, while the ash content of animal-derived biochar is significantly higher than that of plant-derived biochar. [0003] The specific surface area is the most important index to indicate the structure of black carbon. The larger the specific surface area, the better the improvement effect on the physical structure of the soil, and it can better absorb ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02
Inventor 谭武贵柳开楼丰来李亚贞胡惠文叶会财徐小林周利军余跑兰
Owner HUNAN TAIGU BIOTECH
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