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Silver-loaded floating beads, and preparation and application of silver-loaded floating beads in adsorption of reduced elemental mercury in desulfurization slurry

A floating bead and silver-carrying technology, which is used in adsorption water/sewage treatment, other chemical processes, gaseous discharge wastewater treatment, etc., to achieve good wear resistance, improved mercury removal efficiency, and high efficiency.

Inactive Publication Date: 2019-11-22
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The invention solves the technical problem of the re-release of reduced elemental mercury in the desulfurization wastewater in the prior art

Method used

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  • Silver-loaded floating beads, and preparation and application of silver-loaded floating beads in adsorption of reduced elemental mercury in desulfurization slurry
  • Silver-loaded floating beads, and preparation and application of silver-loaded floating beads in adsorption of reduced elemental mercury in desulfurization slurry
  • Silver-loaded floating beads, and preparation and application of silver-loaded floating beads in adsorption of reduced elemental mercury in desulfurization slurry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] (1) the silver nitrate of 17g is dissolved in 18.46ml concentration and is the ammoniacal liquor of 20wt%, is settled to 100ml, forms silver ammonia solution;

[0044] (2) add 40g floating pearls in the silver ammonia solution of described step (1), and stir with the speed of 70r / min;

[0045] (3) ultrasonically treating the stirred mixed solution in the step (2) for 3 hours, and drying at 100° C. for 1 hour;

[0046](4) Activate the dried silver-ammonia solution-loaded floating beads in the step (3) at 250° C. for 5 hours under an Ar atmosphere to obtain a silver-loaded floating beads A that inhibits the re-release of mercury in the wet flue gas desulfurization process .

[0047] (5) The mercury adsorption performance test experiment was performed on the floating beads loaded with elemental silver after high temperature activation in the step (4), the initial mercury concentration was 50 μg / m 3 , the amount of adsorbent is 30mg, the adsorption temperature is 140°C, a...

Embodiment 2

[0049] (1) the silver carbonate of 16.56g is dissolved in 43.68ml concentration and is the ammoniacal liquor of 20wt%, is settled to 100ml, forms silver-ammonia solution;

[0050] (2) add 40g floating beads in the silver ammonia solution of described step (1), and stir with the speed of 300r / min;

[0051] (3) ultrasonically treating the stirred mixed solution in the step (2) for 2 hours, and drying at 100° C. for 1 hour;

[0052] (4) the floating beads of the loaded silver ammonia solution dried in the step (3) in N 2 Activated at 350°C for 5 hours in the atmosphere to obtain a silver-loaded floating bead B that inhibits the re-release of mercury in the wet flue gas desulfurization process.

[0053] (5) The mercury adsorption performance test experiment was performed on the floating beads loaded with elemental silver after high temperature activation in the step (4), the initial mercury concentration was 50 μg / m 3 , the amount of adsorbent is 30mg, the adsorption temperature...

Embodiment 3

[0055] (1) the silver nitrate of 8.5g is dissolved in 9.23ml concentration and is the ammoniacal liquor of 20wt%, is settled to 100ml, forms silver-ammonia solution;

[0056] (2) add 40g floating beads in the silver ammonia solution of described step (1), and stir with the speed of 100r / min;

[0057] (3) ultrasonically treat the stirred mixed solution in the step (2) for 5 hours, and dry at 110° C. for 1 hour;

[0058] (4) the floating beads of the loaded silver ammonia solution dried in the step (3) in N 2 Activated at 200°C for 5 hours in the atmosphere to obtain a silver-loaded floating bead C that inhibits the re-release of mercury during the wet flue gas desulfurization process.

[0059] (5) The floating beads loaded with elemental silver after high-temperature activation in the step (4) were subjected to a mercury adsorption performance test experiment, and the initial mercury concentration was 40 μg / m 3 , the amount of adsorbent is 30mg, the adsorption temperature is ...

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Abstract

The invention relates to silver-loaded floating beads, and preparation and application of the silver-loaded floating beads to adsorption of reduced elemental mercury in desulfurization slurry, and belongs to the field of coal-fired flue gas mercury removal. The preparation method of the silver-loaded floating bead comprises the following steps: dissolving ammonia-soluble salt of silver in ammoniawater to obtain a silver-ammonia solution; dipping the floating beads into the obtained silver-ammonia solution, so that the silver-ammonia solution is loaded on the surfaces of the floating beads; and drying the obtained floating beads with the surfaces loaded with the silver-ammonia solution, and then carrying out heating activation in an inert atmosphere, the heating activation being carried out under a dark condition, so that elemental silver is uniformly loaded on the surfaces of the floating beads, and the silver-loaded floating beads are obtained. According to the preparation method, elemental silver is uniformly loaded on the surfaces of the floating beads, reduced elemental mercury in the desulfurization wastewater can be adsorbed, the silver-loaded floating beads are large in buoyancy and good in wear resistance and can exist in the desulfurization wastewater for a long time, and the subsequent recovery method is simple. The silver-loaded floating beads adsorbing elemental mercury can be recycled, so that the cost is relatively low.

Description

technical field [0001] The invention belongs to the field of mercury removal from coal-burning flue gas, and in particular relates to a silver-loaded floating bead and the application of the reduced elemental mercury in the preparation and adsorption desulfurization slurry. Background technique [0002] Mercury is a toxic heavy metal, which has been widely concerned by more and more scholars due to its strong volatility, persistence and bioaccumulation. US Environmental Protection Agency survey data show that coal-fired power plants are one of the largest sources of anthropogenic mercury emissions in the world. China is the world's largest coal-consuming country, so China's mercury emissions are significantly higher than the world's average level, so the problem of mercury pollution caused by coal combustion in my country is not optimistic, and it is extremely important to take measures to control mercury emissions from coal-fired power plants. [0003] At present, there ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/32B01J20/02B01J20/28C02F1/28C02F101/20C02F103/18
CPCB01J20/02B01J20/28011B01J20/28021B01J20/3214C02F1/281C02F2101/20C02F2103/18
Inventor 罗光前史梦婷邹仁杰孙瑞泽刘梦圆胡靖远李显姚洪
Owner HUAZHONG UNIV OF SCI & TECH
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