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Modified carbon-based adsorbent as well as preparation method and application thereof

A carbon-based adsorbent and adsorbent technology, applied in separation methods, chemical instruments and methods, and other chemical processes, can solve the problems of complicated preparation process, low mercury removal efficiency, waste of resources and other problems of modified activated carbon mercury adsorbent. Achieve fast adsorption rate, reduce mercury removal cost, and reduce usage

Active Publication Date: 2021-11-30
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the problems of complex preparation process, high energy consumption, serious waste of resources, high cost and low mercury removal efficiency of existing modified activated carbon mercury adsorbents, reduce the usage of activated carbon, and further reduce the cost of mercury removal, the present invention provides a Modified carbon-based adsorbent and its preparation method and application. The method has simple operation, simple process, short time consumption, low energy consumption, low cost, no waste water and waste residue, less raw material consumption, and can be greatly improved after modification. Improve the mercury removal capacity and mercury removal rate of activated carbon

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The specific surface area of ​​20g is 1220m 2 / g of commercial coconut shell activated carbon and 20g copper chloride dihydrate are evenly mixed for later use, and 0.8mL of dilute hydrochloric acid with a mass concentration of 2% is added dropwise to the mixed sample to moisten; the mixed sample is fully mechanically milled, and the temperature of the mechanical ball mill is 25 ℃, the mechanical ball milling time is 10min, the rotational speed is 200r / min, the ball-to-material ratio is 3:2; the drying temperature after ball milling is 50℃, and the drying time is 1h. After sieving, the modified carbon-based adsorbent with a particle size of less than 74μm is obtained. Weigh 5 mg of modified carbon-based adsorbent and place it in a simulated fixed-bed reactor. Elemental mercury is produced through a mercury permeation tube. The RA915 mercury detector is used to measure the mercury concentration in real time. The mass flow meter accurately controls the gas flow of each comp...

Embodiment 2

[0029] The specific surface area of ​​20g is 855m 2 Mix 0.3mL of commercial coal-based activated carbon with 2g of ferric chloride evenly for later use, add 0.3mL of dilute hydrochloric acid with a mass concentration of 4% to wet the mixed sample; fully mechanically ball mill the mixed sample, and the temperature of the mechanical ball mill is 25°C. The mechanical ball milling time is 60min, the rotational speed is 150r / min, and the ball-to-material ratio is 1:1; the drying temperature after ball milling is 60°C, and the drying time is 1.5h. After sieving, a modified carbon-based adsorbent with a particle size of less than 48μm is obtained. Weigh 100mg of modified carbon-based adsorbent and spray it into a volume of 1m 3 In the pilot test injection tower, elemental mercury is produced by the mercury generator, and the RA915 mercury detector is used to measure the mercury concentration in real time. The flue gas flow valve controls the gas flow, Hg 0 The initial concentration ...

Embodiment 3

[0031] The specific surface area of ​​20g is 560m 2 / g of commercial fruit shell activated carbon and 5g of copper bromide are evenly mixed for later use, and 0.2mL of dilute hydrochloric acid with a mass concentration of 2% is added dropwise to the mixed sample for wetting; the mixed sample is fully mechanically milled, and the temperature of the mechanical ball mill is 25°C. The mechanical ball milling time is 60min, the rotational speed is 250r / min, and the ball-to-material ratio is 3:2; the drying temperature after ball milling is 60°C, and the drying time is 2h. After sieving, the modified carbon-based adsorbent with a particle size of less than 74μm is obtained. Weigh 50mg of modified carbon-based adsorbent and place it in a simulated fixed-bed reactor. Elemental mercury is produced through a mercury permeation tube. The RA915 mercury detector is used to measure the mercury concentration in real time. The mass flow meter accurately controls the gas flow rate of each compo...

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Abstract

The invention discloses a modified carbon-based adsorbent as well as a preparation method and application thereof. According to the method, activated carbon is used as a carrier, cuprous chloride, copper chloride, ferric chloride, calcium chloride, copper bromide, ferrous bromide, calcium bromide, cuprous iodide, ferrous iodide, calcium iodide and the like are loaded as activators, and a modified carbon-based material is successfully prepared through normal-temperature mechanical ball milling activation and used as an adsorbent for fixed removal of mercury in flue gas. The method is simple in process, easy to operate and short in consumed time; operation can be carried out at normal temperature without high-temperature roasting, and energy consumption is low; no wastewater or waste residue is generated in a modification process, the consumption of water and raw materials is small, and cost is remarkably reduced; and the modified carbon-based adsorbent is large in mercury adsorption capacity and high in adsorption rate, and a product obtained after mercury removal is environmentally friendly and free of secondary pollution.

Description

technical field [0001] The invention belongs to the technical field of environmental pollution prevention and purification, and in particular relates to a modified carbon-based adsorbent and its preparation method and application. Background technique [0002] Mercury is a typical heavy metal pollutant in industrial flue gas, which is highly toxic, highly corrosive, highly volatile, and easy to migrate and diffuse. Mercury and its compounds can accumulate in organisms through the food chain, endangering the human nervous system and causing serious harm to human health and the ecological environment. Mercury emission sources can be divided into natural sources and anthropogenic sources. China is the world's largest anthropogenic mercury emitter, and coal combustion is the largest anthropogenic mercury pollution source in my country. The mercury emitted by coal combustion accounts for 40% of the country's total anthropogenic mercury emissions. , other heavy industries such as ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/28B01J20/30B01D53/10
CPCB01J20/20B01J20/28064B01J20/28066B01D53/10B01D2257/602
Inventor 李海龙孟凡悦杨建平屈文麒杨泽群
Owner CENT SOUTH UNIV
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