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Preparation method of biochar

A biochar and biomass technology, applied in the field of biomass resource utilization, can solve the problems of high land occupation rate, long processing cycle, land occupation, etc., and achieve the effect of high carbon content rate, simple preparation process and wide sources

Inactive Publication Date: 2012-07-25
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional treatment methods such as incineration and landfill not only easily cause environmental pollution, but also occupy land
The treatment method that has emerged this year - composting, although it can be recycled, it has a long treatment cycle and a high land occupation rate

Method used

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  • Preparation method of biochar
  • Preparation method of biochar

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1. See the process flow chart figure 1 . Remove the roots of Spartina alterniflora, wash the two biomasses of Spartina alterniflora and green waste with distilled water, and air-dry. After air-drying, put it in an oven to dry at 105° C. for 15 hours, and then pulverize it with a pulverizer to obtain a 50-mesh powder.

[0027] 2. Mix Spartina alterniflora and green waste powder at a mass ratio of 1:1, place it in a tube furnace, and heat it up to 300°C at a rate of 5°C / min in an atmosphere of nitrogen gas of 100mL / min. 2h. Continue to pass through 50mL / min of nitrogen to cool to room temperature, grind, and pass through a 50-mesh sieve.

[0028] 3. The carbonized powder was washed three times with 1mol / L HCl and 1mol / LHF mixed according to the volume ratio of 1:1, and then washed with water until the pH was neutral, and dried at 110°C to obtain biochar. The yield was 43%, and biochar BC-1 was obtained.

Embodiment 2

[0029] Example 2: Other steps are the same as in Example 1, the pyrolysis nitrogen rate is 120mL / min, the pyrolysis temperature is 400°C, and the pyrolysis is 1.5 hours. The yield was 40%, and biochar BC-2 was obtained.

Embodiment 3

[0030] Example 3: Other steps are the same as in Example 2, and the pyrolysis temperature is 500°C. The yield was 39%, and biochar BC-3 was obtained.

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Abstract

The invention belongs to resource utilization of biomass, and in particular relates to a method for producing biochar from invasive plants and greening garbage. The utilized raw materials are biological waste organic matters including Spartina alterniflora, fallen leaves, branches and trunks. The method comprises the steps of removing roots of Spartina alterniflora, pulverizing after cleaning and drying Spartina alterniflora with the greening garbage; mixing the obtained biomass powder by a certain mass ratio to obtain mixed powder, performing pyrolysis under nitrogen protection at 300-600 DEG C for 1-4h, cooling to room temperature, grinding and sieving; washing the carbonized product with HCl / HF at a volume ratio of 1:1, then washing to a neutral pH with distilled water, and drying to obtain the noval biochar product. By using Spartina alterniflora and the greening garbage with a high carbon content as the raw materials, the preparation method overcomes the disadvantages of seasonality and periodicity of the raw materials and is simple and easy in implementation and low in cost, and the prepared product has good adsorbability and wide applications, realizes the resource utilization of the invasive plants and the greening garbage and achieves favorable ecological, social and economic benefits.

Description

technical field [0001] The invention belongs to the resource utilization of biomass, in particular to a method for producing biochar by using invasive plants and greening garbage. Background technique [0002] Biochar is the carbon-rich solid by-product remaining after the pyrolysis of biomass in anaerobic or low-oxygen conditions. In recent years, due to the significant environmental and social benefits of biochar, it has aroused widespread interest and great attention worldwide. Because of its high carbon content, well-developed pore structure, good corrosion resistance, it can retain water, nutrients, and adsorb pollutants such as organic matter and heavy metals. It is an ideal soil conditioner and adsorbent. The application of biochar can bring four environmental benefits: slow down the greenhouse effect, improve the soil, increase the yield of crops, and reduce environmental pollution. After biochar is pyrolyzed, most of its components are carbon, which is stable in n...

Claims

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Application Information

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IPC IPC(8): C01B31/02B09B3/00C01B32/05
Inventor 刘强郭丽晶张亚萍李密易鹏
Owner SHANGHAI UNIV
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