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Biomass activated carbon, preparation method thereof and application thereof in flue gas mercury removal

A technology of activated carbon and biomass, applied in the fields of biomass utilization and pollutant removal, can solve the problems of low yield, complicated steps, strict preparation conditions, etc., and achieve the effects of low production cost, simple production equipment and easy production conditions

Inactive Publication Date: 2012-06-27
SHANGHAI UNIVERSITY OF ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The object of the present invention is to solve the above-mentioned technical problems such as complex steps of the preparation process, low yield and strict preparation conditions, and to provide a kind of raw material of common crop straws such as peanut shells, walnut shells, corn straw, soybean straw or wheat straw. Biomass activated carbon and its preparation method and application in flue gas mercury removal

Method used

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  • Biomass activated carbon, preparation method thereof and application thereof in flue gas mercury removal
  • Biomass activated carbon, preparation method thereof and application thereof in flue gas mercury removal
  • Biomass activated carbon, preparation method thereof and application thereof in flue gas mercury removal

Examples

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Embodiment 1

[0050] With the peanut shell of Tanghe County, Henan Province as raw material, a kind of biomass activated carbon of the present invention is prepared, comprising the following steps:

[0051] (1) Pretreatment of biomass raw materials

[0052] Wash the peanut shells with clean water and dry them in an oven; after drying, transfer the raw materials to a mortar for grinding and pass through a 60-mesh sieve;

[0053] (2) Activation of biomass raw materials

[0054] Immersing the pretreated biomass raw material peanut shells in the step (1) with an activator zinc chloride solution for 20h-30h;

[0055] The concentration of the zinc chloride aqueous solution used is 20%; 30%; 40%; 50%;

[0056] (3) Carbonization of biomass raw materials

[0057] The impregnated biomass raw material obtained in step (2) is placed in a nitrogen-protected environment, and the temperature is controlled to be 400°C; 500°C; 600°C; 700°C; the time is 1.5h; 2h; 2.5h; 3h, Carry out carbonization, ta...

Embodiment 2

[0059] Taking the walnut shell of Tanghe County, Henan Province as raw material, a kind of biomass activated carbon of the present invention is prepared, comprising the steps:

[0060] (1) Pretreatment of biomass raw materials

[0061] Wash the walnut shells with clean water and dry them in an oven; after drying, transfer the raw materials to a mortar for grinding and pass through a 60-mesh sieve;

[0062] (2) Activation of biomass raw materials

[0063] Immersing the pretreated biomass walnut shells in step (1) with an activator zinc chloride solution for 20 to 30 hours;

[0064] The concentration of the zinc chloride aqueous solution used is 20%; 30%; 40%; 50%;

[0065] (3) Carbonization of biomass raw materials

[0066] Carbonize the impregnated biomass raw material obtained in step (2) under a nitrogen-protected environment at controlled temperatures of 600°C; 700°C; 400°C; 500°C for 2h; 1.5h; 3h; 2.5h , take out the carbonized biomass raw material, after natural c...

Embodiment 3

[0068] Using corn stalks in Nanqiao Town, Fengxian District, Shanghai as a raw material, preparing a kind of biomass activated carbon of the present invention comprises the following steps:

[0069] (1) Pretreatment of biomass raw materials

[0070] Wash the corn stalks with clean water and dry them in an oven; after drying, transfer the raw materials to a mortar for grinding and pass through a 60-mesh sieve;

[0071] (2) Activation of biomass raw materials

[0072] Immersing the pretreated biomass raw material corn stalks in step (1) with an activator zinc chloride solution for 20 to 30 hours;

[0073] The concentration of the zinc chloride aqueous solution used is 20%; 30%; 40%; 50%;

[0074] (3) Carbonization of biomass raw materials

[0075] The impregnated biomass raw material obtained in step (2) is placed in a nitrogen-protected environment, and the temperature is controlled to be 700°C; 600°C; 500°C; 400°C; and the time is 2.5h; 3h; 1.5h; 2h, Carry out carboniz...

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Abstract

The invention discloses biomass activated carbon, a preparation method thereof and the application thereof in flue gas mercury removal. Ordinary crop straws serve as raw materials, the biomass raw materials are impregnated by activator, i.e. zinc chloride aqueous solution with the concentration being 20 percent to 50 percent for 20 hours to 30 hours; after the impregnated biomass raw materials are carbonized for 1.5 hours to 3 hours at 400DEG C to 700DEG C under the protection of nitrogen and are taken out and naturally cooled, the carbonized biomass raw materials are washed by 5 percent to 15 percent of hydrochloric acid, rinsed by distilled water to neutral and filtered by neutral filter paper, dried and ground in an oven, and finally the biomass activated carbon is finally obtained. According to the biomass activated carbon, the ordinary crop straws serve as the raw materials, not only waste can be changed into valuable, but also the production cost is low. Simultaneously, because the biomass activated carbon can absorb methylene blue and mercury, the biomass activated carbon can be used in the demercuration of coal-fired flue gas, and can mitigate the environmental pollution.

Description

technical field [0001] The invention relates to the fields of biomass utilization and pollutant removal, in particular to a biomass activated carbon, a preparation method thereof and an application in flue gas mercury removal. Background technique [0002] Activated carbon has a rich pore structure and a huge specific surface area. In addition, the surface of activated carbon has a variety of functional groups. It has great value in food treatment, anti-virus and deodorization, and pollutant treatment. Mercury is a globally circulating substance that is extremely harmful to the human body. It can be passed in the food chain and enriched in the body to cause damage to human tissues. The global annual mercury emission is about 5000t, of which 4000t is anthropogenic. In recent years, my country is considered to be one of the countries with the largest mercury emissions in the world, so the problem of mercury control in flue gas has become increasingly urgent. [0003] The use...

Claims

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Application Information

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IPC IPC(8): C01B31/12B01D53/02C01B32/324C01B32/348
Inventor 吴江刘倩雁何平潘卫国任建兴李琦芬陈洁鹤赵丽丽王灵芝许丽娜郭腾
Owner SHANGHAI UNIVERSITY OF ELECTRIC POWER
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