Multifunctional bio-charcoal and preparation method thereof

A multifunctional, biochar technology, applied in the field of biochar, can solve the problems of difficult control of reaction conditions, many production process links, complicated operation process, etc. Effect

Inactive Publication Date: 2014-11-05
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the existing technology, the method of obtaining multifunctional activated carbon must use multiple modification means, so the production process has many links, complicated operation and high production cost
[0007] To sum up, although the current multifunctional activated carbon preparation process has its advantages, it has the problems of high production cost, low output, difficult control of reaction conditions, complicated operation process, and easy to cause environmental pollution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A multifunctional biochar and a preparation method thereof. Immerse the biomass in a KOH solution with a mass fraction of 1-5% for 20-30 hours, wash with water until neutral, and dry to obtain the treated biomass; then place the treated biomass in a tube furnace for mixing Carry out carbonization under atmospheric conditions, the carbonization temperature is 650~750°C, and the carbonization time is 1~5h to prepare multifunctional biochar.

[0024] The biomass described in this embodiment is rice straw. Among them: the volatile organic carbon of charcoal is 30~40wt%, the fixed carbon is 10~20wt%, the ash is 20~30wt%, and the moisture is 10~30wt%.

[0025] The mixed atmosphere described in this embodiment is: the ammonia gas integral rate is 10-30%, the sulfur dioxide gas integral rate is 1-5%, and the nitrogen gas integral rate is 50-70%; the pressure of the mixed atmosphere is 0.15-0.3 MPa.

[0026] The multifunctional biochar prepared in this example: the mass fracti...

Embodiment 2

[0028] A multifunctional biochar and a preparation method thereof. Immerse the biomass in a NaOH solution with a mass fraction of 5-10% for 40-50 hours, wash with water until neutral, and dry to obtain the treated biomass; then put the treated biomass in a tube furnace for mixing Carry out carbonization under atmospheric conditions, the carbonization temperature is 750-850°C, and the carbonization time is 5-10 hours, so as to prepare multifunctional biochar.

[0029] The biomass described in this embodiment is wheat straw. Among them: the volatile organic carbon of charcoal is 40~60wt%, the fixed carbon is 10~30wt%, the ash is 10~20wt%, and the moisture is 20~30wt%.

[0030] The mixed atmosphere described in this embodiment is: the ammonia gas integral rate is 30-50%, the oxygen volume fraction is 1-5%, the sulfur dioxide volume fraction is 1-5%, and the nitrogen gas integral rate is 40-60%; The pressure of the atmosphere is 0.15~0.3MPa.

[0031] The multifunctional biochar...

Embodiment 3

[0033] A multifunctional biochar and a preparation method thereof. Immerse the biomass in a KOH solution with a mass fraction of 10-15% for 30-40 hours, wash with water until neutral, and dry to obtain the treated biomass; then put the treated biomass in a tube furnace for mixing Carbonization is carried out under atmospheric conditions, the carbonization temperature is 300-500°C, and the carbonization time is 10-20 hours, so as to prepare multi-functional biochar.

[0034] The biomass described in this embodiment is grass. Among them: the volatile organic carbon of charcoal is 30~50wt%, the fixed carbon is 10~30wt%, the ash is 1~20wt%, and the moisture is 30~50wt%.

[0035] The mixed atmosphere described in this embodiment is: the ammonia gas integral rate is 20-40%, the oxygen volume fraction is 1-5%, the sulfur dioxide volume fraction is 5-10%, and the nitrogen gas integral rate is 40-60%; The pressure of the atmosphere is 0.15~0.3MPa.

[0036] The multifunctional biocha...

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Abstract

The invention relates to a multifunctional bio-charcoal and a preparation method thereof. According to the technical scheme, the preparation method comprises the steps of dipping biomass into 1-15wt% caustic alkali solution for 1-50h, washing with water to be neutral, and drying to obtain treated biomass; then charring the treated biomass in a tube furnace in mixed gas at 300-900 DEG for 1-130h to obtain the multifunctional bio-charcoal. The biomass is one of rice straw, wheat straw, sawdust, wood, green grass, fruit peel and animal tissue waste; the biomass contains 30-60wt% of volatile organic carbon of charcoal, 10-40wt% of fixed carbon, 1-30wt% of ash and 10-60wt% of water. The preparation method disclosed by the invention has the characteristics of low production cost, high yield, simple process, controllable production process and environment friendliness, and the prepared multifunctional bio-charcoal has a good adsorption effect on heavy metals and high stability and can be used for repairing water bodies, solid matrixes and soil which are polluted by heavy metals.

Description

technical field [0001] The invention belongs to the technical field of biochar. In particular, it relates to a multifunctional biochar and a preparation method thereof. technical background [0002] Biochar is a carbon-rich solid product obtained by thermally decomposing biomass in the absence of air or under the condition of insufficient oxygen supply. Compared with ordinary carbon, biochar has the following advantages: ①Naturally endowed with N, O, S, P and other heteroatom functional groups, it is a high-quality adsorbent for immobilizing heavy metal ions. ?The naturally developed capillary structure is conducive to the formation of mesopores or macropores in order to improve the kinetic characteristics of the adsorption process. ?As a soil improver, biochar can not only be used as an organic fertilizer to improve soil fertilizer efficiency, but also can improve the health of soil micro-cluster structure due to the addition of a large amount of organic carbon, and can a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/02
Inventor 童仕唐林珈羽张越毛磊
Owner WUHAN UNIV OF SCI & TECH
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