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Carbon-based mercury-removing absorbent and preparation method thereof

An adsorbent and mercury removal technology, applied in separation methods, chemical instruments and methods, other chemical processes, etc., can solve the problems of complex preparation process of adsorbents and high cost of mercury removal, and achieve improved mercury removal capacity and micropore content. Effect

Active Publication Date: 2017-01-11
ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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  • Summary
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  • Application Information

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Problems solved by technology

[0005] Patent 201510548763.4 uses fly ash as the main body, and prepares flue gas mercury removal adsorbent by adding ferric nitrate, manganese acetate, glass fiber, sodium silicate, sodium tartrate, calcium oxide, chitin, and borate coupling agent. fly ash, but many components need to be added, the preparation process of adsorbent is complicated, and the cost of mercury removal is high

Method used

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  • Carbon-based mercury-removing absorbent and preparation method thereof

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preparation example Construction

[0022] The invention provides a preparation method of a carbon-based mercury removal adsorbent, comprising:

[0023] A) mixing and etching fly ash and lye to obtain etched fly ash;

[0024] B) In an inert gas environment, mix the etched fly ash with metal halides and alkalis, and activate to obtain activated fly ash; the activation temperature is 700°C-800°C, and the activation time is 90-90°C. 120min;

[0025] C) Mixing and modifying the activated fly ash and the metal halide solution to obtain a carbon-based mercury-removing adsorbent.

[0026] The invention firstly mixes fly ash and lye and etches to obtain etched fly ash.

[0027] The fly ash in the present invention is the fly ash obtained from the combustion of coal in a power plant, and the inventor does not limit this, as long as those skilled in the art are familiar with it.

[0028] The fly ash is preferably pretreated, and the pretreatment specifically includes drying and sieving.

[0029] The drying is preferab...

Embodiment 1

[0060] The fly ash taken from the power plant was used as raw material, dried at 105°C for 8 hours to remove moisture, and passed through a 200-mesh sieve.

[0061] Take by weighing 10g potassium hydroxide, and add 25ml of ultrapure water and stir to make it dissolve completely; Take by weighing 2g fly ash and place in potassium hydroxide solution, make it mix evenly, wherein the mass ratio of potassium hydroxide and fly ash is 5: 1. The mixed solution was ultrasonically treated for 40 minutes, then poured into a sealed sample bottle, tightened, placed in a shaker, and shaken continuously for 12 hours, and then dried in a blast drying oven at a rate of 10°C / min to 105°C for 7 hours to constant weight to obtain the etched fly ash.

[0062] Put the dried mixed sample into a crucible, put it in a simulated flue, and under the protection of nitrogen in 500ml / min, load 2g potassium hydroxide, 1.5gZnCl 2 The fly ash was activated at 800°C for 120min. After cooling, the activated s...

Embodiment 2

[0066] The fly ash taken from the power plant was used as raw material, dried at 105°C for 9 hours to remove moisture, and passed through a 200-mesh sieve.

[0067] Take by weighing 8g sodium hydroxide, and add 25ml of ultrapure water and stir to make it dissolve completely; Take by weighing 2g fly ash and place in sodium hydroxide solution, make it mix evenly, wherein the mass ratio of sodium hydroxide and fly ash is 4: 1. The mixed solution was ultrasonically treated for 50 minutes, then poured into a sealed sample bottle, tightened, placed in a shaker, and shaken continuously for 12 hours, and then dried in a blast drying oven at a rate of 10°C / min to 105°C for 7 hours to constant weight to obtain the etched fly ash.

[0068] Put the dried mixed sample into a crucible, put it in a simulated flue, and under the protection of nitrogen in 500ml / min, load 2g calcium hydroxide, 1.5gZnCl 2 The fly ash was activated at 800°C for 120min. After cooling, the activated sample was wa...

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Abstract

The invention relates to a preparation method of a carbon-based mercury-removing absorbent. The preparation method includes the steps of A), mixing fly ash with alkaline liquid, and etching to obtain etched fly ash; B), mixing the etched fly ash with metal halide and alkali under an inert gas environment, and activating to obtain activated fly ash, wherein activating temperature is 700-800 DEG C and activating time is 90-120 minutes; C), mixing the activated fly ash with a metal halide solution, and modifying to obtain the carbon-based mercury-removing absorbent. The preparation method has the advantages that the fly ash is subjected to alkaline liquid etching first, the alkali is allowed to react with the carbon of the fly ash, and a large amount of pores exist at etched positions; the specific surface area, micropore contents and functional groups of the fly ash are increased to a large extent by the activating; the surface and inside of the fly ash carry halogen elements through the modification by the metal halide solution, and the mercury-removing ability of the fly ash is further increased.

Description

technical field [0001] The invention relates to the technical field of mercury removal from flue gas, in particular to a carbon-based mercury removal adsorbent and a preparation method thereof. Background technique [0002] Trace element mercury is a toxic, volatile, and difficult-to-control pollutant. Excessive discharge of mercury will cause a series of serious problems such as damage to various organs of the human body and harm the development of fetuses and infants. The concentration of mercury in the atmosphere is 0.25~0.6ppt (2~5ng / m 3 ), while in the industrial production process, the mercury emission concentration is 400-1000 times that in the atmosphere, the mercury emission concentration of coal-fired power plants is between 100-600ppt, and the emission concentration of waste incineration is between 10000-100000ppt. At the same time, due to the large emission base of coal-fired power plants, coal-fired mercury pollution has become another major pollution problem a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/30B01D53/02
CPCB01D53/02B01D2257/602B01J20/20B01J2220/4887
Inventor 殷立宝陈元金范军辉陈天
Owner ELECTRIC POWER RES INST OF GUANGDONG POWER GRID
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