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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 of using sulfide to generate HgS is difficult to recycle mercury and sulfur; and if it is not disposed of properly, these methods may cause secondary pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Weigh 10 g of activated alumina with a particle size of 0.25 mm as the adsorbent carrier for standby, and prepare 100 ml of zinc sulfide nano-adsorbent reaction precursor solution (zinc chloride 0.5 mol / L, thiourea 2 mol / L, mercaptopropionic acid 1.5 mol / L ). Immerse 10 g of activated alumina in the nano-adsorbent reaction precursor solution, and react with stirring at a speed of 100 rpm at a temperature of 95° C. 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 the zinc sulfide nano-mercury removal adsorbent. After testing, the loading capacity of the nano-adsorbent on the activated alumina is about 32%. The specific surface area of ​​mercury removal adsorbent is about 367m 2 / g.

Embodiment 2

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

Embodiment 3

[0031] 0.1 g of the zinc sulfide nano-adsorbent prepared in Example 1 was placed in 50 mL of mercuric chloride solution with a concentration of 200 mg / L, and stirred at a speed of 400 rpm. After 5 minutes, the solution was treated by filtration, and the filtrate was detected. 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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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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