Nitric acid modified activated carbon adsorbent for demercuration of flue gas, and preparation method and application thereof

A technology of activated carbon adsorption and activated carbon, which is applied in chemical instruments and methods, other chemical processes, etc., can solve the problem of high cost of activated carbon, and achieve the effects of low cost, simple preparation method and easy preparation.

Inactive Publication Date: 2014-09-03
INST OF PROCESS ENG CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the cost of activated carbon is slightly higher, which will inevitably limit its wide application. Therefore, it is necessary to find a suitable modification method to prepare activated carbon with high adsorption activity to reduce the cost of activated carbon.

Method used

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  • Nitric acid modified activated carbon adsorbent for demercuration of flue gas, and preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] A preparation method for a nitric acid modified activated carbon adsorbent for flue gas demercuration, specifically comprising the following steps:

[0046] 1) Prepare a nitric acid solution with a molar concentration of 1mol / L, fully mix and let stand to clarify;

[0047] 2) According to the volume ratio of activated carbon and nitric acid solution of 1:1, impregnate bamboo granular activated carbon with a mesh number ranging from 20 to 100 meshes into the above nitric acid solution, and use ultrasonic waves at a temperature of 25°C, a frequency of 40KHz, and a power of 120W. Shake in the washer for 4 hours; then use distilled water to wash the modified activated carbon repeatedly until the pH value of the filtrate is 7, then place it in a drying oven and dry it at 60°C for 8 hours to obtain the nitric acid modification for mercury removal in coal-fired flue gas. activated carbon adsorbent.

Embodiment 2

[0049] A preparation method for a nitric acid modified activated carbon adsorbent for flue gas demercuration, specifically comprising the following steps:

[0050] 1) Prepare a nitric acid solution with a molar concentration of 3mol / L, fully mix and let stand to clarify;

[0051] 2) According to the volume ratio of activated carbon and nitric acid solution of 1:5, impregnate powdered activated carbon with a mesh size ranging from 30 to 90 meshes into the above nitric acid solution, and use an ultrasonic cleaner with a temperature of 100°C, a frequency of 40KHz, and a power of 300W Shake in medium for 0.5h; then use distilled water to wash the modified activated carbon repeatedly until the pH value of the filtrate is 7, then place it in a drying oven and dry it at 80°C for 15h to obtain the modified nitric acid for mercury removal in coal-fired flue gas. Activated carbon adsorbent.

Embodiment 3

[0053] A preparation method for a nitric acid modified activated carbon adsorbent for flue gas demercuration, specifically comprising the following steps:

[0054] 1) Prepare a nitric acid solution with a molar concentration of 5mol / L, fully mix and let stand to clarify;

[0055] 2) According to the volume ratio of activated carbon and nitric acid solution of 1:1~5, impregnate coal-based activated carbon with a mesh number ranging from 20 to 100 meshes into the above nitric acid solution. Shake in an ultrasonic cleaner for 2 hours; then use distilled water to wash the modified activated carbon repeatedly until the pH value of the filtrate is 7, then place it in a drying oven and dry it at 90°C for 12 hours to obtain nitric acid for mercury removal in coal-fired flue gas Modified activated carbon adsorbent.

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Abstract

The invention relates to a nitric acid modified activated carbon adsorbent for demercuration of a flue gas, and a preparation method and application thereof. The preparation method comprises the steps of washing activated carbon in a certain size range clean with distilled water, drying for use; preparing a certain concentration of a nitric acid modified solution; then impregnating the activated carbon by using the solution; and finally washing a filtrate and drying to obtain the nitric acid modified activated carbon adsorbent used for the demercuration. The nitric acid modified activated carbon adsorbent takes use of the characteristic that nitric acid can increase surface functional groups of the activated carbon, so that mercury is captured when a mercury-containing flue gas component enters a porous structure of the activated carbon. The nitric acid modified activated carbon is an efficient demercuration adsorbent specialized forflue gas injection demercuration of power plants, industrial boilers and industrial furnaces; operation and the preparation processes have the advantages of low energy consumption, simple operations and low cost; and mercury adsorption capacity of the modified activated carbon is greatly improved, thereby effectively controlling mercury in the coal-fired flue gas.

Description

technical field [0001] The invention belongs to the field of flue gas pollutant control, and mainly relates to a method for adsorbing and removing mercury in flue gas by applying carbon materials, in particular to a nitric acid-modified activated carbon adsorbent for flue gas demercuration, its preparation method and application . Background technique [0002] my country is a big coal-producing country and a big coal-burning country. Coal accounts for 75% of the energy structure. my country's annual coal consumption is about 2 billion tons, of which more than 70% are used for coal-fired power generation. A large amount of pollutants are produced, and trace amounts of heavy metal mercury are characterized by persistence, easy migration, and high bioaccumulation, causing great harm to humans and the ecological environment. [0003] Mercury diffused into the air from coal combustion flue gas exists in three forms: elemental mercury (Hg 0 ), oxidized mercury (Hg 2+ ), particul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30B01D53/02
Inventor 朱廷钰徐文青佟莉
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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