Absorbent for removing and recovering liquid-phase mercury as well as preparation method and using method thereof

An adsorbent and recovery liquid technology, applied in chemical instruments and methods, other chemical processes, silicates, etc., can solve the problems of difficult mercury and sulfur recycling, small adsorption capacity, high operating costs, and achieve fast adsorption rate, The effect of large adsorption capacity and low price

Active Publication Date: 2014-03-12
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the adsorption capacity of the adsorbent is generally small, and if it is used in large quantities, it will cause high operating costs; and the method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0026] Example 1

[0027] Weigh 10g of activated alumina with a particle size of 0.25mm as the adsorbent carrier for standby, and configure 100ml of zinc sulfide nano-adsorbent reaction precursor solution (zinc chloride 0.5mol / L, thiourea 2mol / L, mercaptopropionic acid 1.5mol / L ). 10 g of activated alumina was immersed in the nano-adsorbent reaction precursor solution, and the temperature was 95° C., and the reaction was carried out at a speed of 100 rpm and stirring for 1 hour. The activated alumina loaded with zinc sulfide is separated by filtration, and dried at room temperature of 25 degrees for 5 hours to prepare a zinc sulfide nanometer mercury-removing adsorbent. After testing, the loading of nano-adsorbent on activated alumina was about 32%. The specific surface area of ​​the mercury removal adsorbent is about 367m 2 / g.

Example Embodiment

[0028] Example 2

[0029] Weigh 10g of molecular sieve with a particle size of 0.25mm as the adsorbent carrier for standby use, and configure 100ml of ferrous sulfide nano-adsorbent precursor solution (ferrous chloride 1mol / L, oleic acid 3mol / L, sulfur element 3mol / L, eighteen ene 100ml). 10 g of molecular sieves were immersed in 100 ml of ferrous sulfide nano-adsorbent precursor solution, and when the temperature was 250° C., the reaction was stirred at a speed of 500 rpm for 1 hour. The molecular sieve loaded with iron sulfide was separated by filtration and washing, and dried at room temperature of 25° C. for 5 hours to obtain the ferrous sulfide adsorbent for mercury removal. After testing, the loading of the nano-adsorbent on the molecular sieve was about 45%. The specific surface area of ​​the mercury removal adsorbent is 483m 2 / g.

Example Embodiment

[0030] Example 3

[0031] Take 0.1 g of the zinc sulfide nano-adsorbent prepared in Example 1 and place it in 50 mL of a mercuric chloride solution with a concentration of 200 mg / L, and stir at a speed of 400 rpm. After 5 minutes, the solution was filtered and the filtrate was tested. The results showed that the removal efficiency of mercury in the solution was greater than 99.9%, and the residual mercury ion concentration was less than 1 μg / L.

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PUM

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Abstract

The invention relates to an absorbent for removing and recovering liquid-phase mercury as well as a preparation method and using method thereof. According to the method, a material with high specific surface area and large pore volume is used as a carrier, and a sulfide or selenide nano absorbent is loaded on the carrier, so as to prepare an ion exchange nano mercury-removing absorbent with high adsorption capacity; a filter layer is prepared by adopting the nano mercury-removing absorbent to perform filtering processing on mercury ion contained waste liquid; the mercury ions in the liquid phase are absorbed to the absorbent by exchanging metal ions and mercury ions on the material, so as to achieve the purpose of removing liquid-phase mercury. The absorbent has the characteristics of high adsorption capacity and quick adsorption rate, and is suitable for waste water mercury-removing processing for coal-fired flue gas, non-ferrous metal metallurgical off-gas and other mercury related industry.

Description

technical field [0001] The invention belongs to a waste water mercury removal technology in the field of environmental protection. The mercury ions in the liquid phase are adsorbed on the adsorbent mainly through the exchange of metal ions on the adsorbent with mercury ions, so as to achieve the purpose of removing mercury in the liquid phase. Background technique [0002] Due to its characteristics of persistence, easy migration, bioaccumulation and high toxicity, mercury pollution has attracted widespread attention from the international community. In January 2013, the United Nations Intergovernmental Negotiating Committee adopted a legally binding "International Convention on the Prevention and Control of Mercury Pollution", which will control and reduce mercury emissions on a global scale. Due to the large amount of mercury emissions in my country, it is bound to face severe pressure on compliance. Coal combustion flue gas and non-ferrous metal smelting flue gas are con...

Claims

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Application Information

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IPC IPC(8): B01J20/08B01J20/16B01J20/30C02F1/42C02F1/62
Inventor 瞿赞李良晏乃强
Owner SHANGHAI JIAO TONG UNIV
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