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Activation and regeneration method for metal sulfide mercury removal adsorbent

A metal sulfide and adsorbent technology, applied in chemical instruments and methods, separation methods, filter regeneration, etc., can solve the problems of inability to restore mercury adsorption activity, low adsorption capacity and adsorption rate, loss of surface active sites, etc. Achieve the effect of reducing adsorbent consumption, easy configuration, and improving mercury adsorption capacity and adsorption rate

Active Publication Date: 2021-07-16
SHANGHAI JIAOTONG UNIV
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Problems solved by technology

However, it has been found that the adsorption capacity and adsorption rate of metal sulfides to zero-valent mercury are still low, which is not enough to remove mercury from extremely high concentrations of Hg. 0 Completely remove zero-valent mercury from smelting flue gas
At the same time, after the metal sulfide absorbs zero-valent mercury, its surface active sites are lost, and its original mercury adsorption activity cannot be restored after one use, resulting in the need to consume a large amount of metal sulfide adsorbents to control the mercury in the flue gas. Zero-valent mercury emissions

Method used

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  • Activation and regeneration method for metal sulfide mercury removal adsorbent

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The chemically synthesized ZnS is used as the main body of the metal sulfide, and the ZnS is activated by divalent copper salt activation solution.

[0036] ZnS is synthesized by hydrothermal method. Dissolve zinc acetate and sodium sulfide with a molar ratio of 1:1 in deionized water respectively, then drop the sodium sulfide solution into the zinc acetate solution and stir for 1 hour; then place the mixed solution in a hydrothermal reaction kettle of appropriate volume , reacted at 180°C for 24 hours; centrifugally cleaned the precipitate after the hydrothermal reaction, first washed 3 times with deionized water, and then washed 2 times with absolute ethanol; the cleaned ZnS was dried in a vacuum oven at 60°C 6 hours; after drying, grind and sieve the ZnS into 60-80 mesh particles.

[0037] Cu in divalent copper salt activation solution 2+ The concentration is 0.005mol / L, and the weight ratio of ZnS to activation solution is 1:100. The activation times of ZnS in th...

Embodiment 2

[0040] The ZnS synthesized by the method in Example 1 is used as the main metal sulfide, and the ZnS is soaked in different metal salt solutions.

[0041] The salt solution used was Zn(NO 3 ) 2 , FeSO 4 、Co 2 (NO 3 ) 3 、NiCl 3 、CuSO 4 , Cu(NO 3 ) 2 of aqueous solution. The concentration of metal ions in each salt solution was 0.005mol / L, the immersion time of ZnS in the salt solution was 5min, and the mass ratio of ZnS to the activation solution was 1:100. The ZnS treated according to the above salt solution sequence are marked as adsorbents A, B, C, D, E, and F in turn. The activated adsorbent was washed and dried in a vacuum oven at 60°C for 6 hours.

[0042] 20mg of adsorbents A-F at a temperature of 60°C and a space velocity of 3.0×10 5 h -1 , the concentration of zero-valent mercury is 1.3mg / m 3 In the nitrogen gas flow, the zero-valent mercury adsorption within 3 hours were 0.32mg / g, 0.54mg / g, 0.61mg / g, 0.57mg / g, 3.64mg / g, 3.62mg / g. The results showed that...

Embodiment 3

[0044] The natural sulfide mineral sphalerite is used as the main body of metal sulfide, and the sphalerite is activated by divalent copper salt activation solution. The sphalerite is mined from the mining area without any chemical treatment. After being sieved and ground to 60-80 mesh particles, it is dried in a drying oven at 60°C for 9 hours.

[0045] The activation time of sphalerite in the activation solution is 5 minutes, and the weight ratio of sphalerite to the activation solution is 1:100. The activated sphalerite was washed and dried in a vacuum oven at 60°C for 6 hours. After 0.001mol / L, 0.002mol / L, 0.005mol / L, 0.01mol / L Cu 2+ The adsorbents obtained after activation by the activation solution are marked as No. A, B, C, and D adsorbents.

[0046] At a temperature of 60°C and a space velocity of 3.0×10 5 h -1 , the concentration of zero-valent mercury is 1.3mg / m 3 In a nitrogen gas stream, the adsorption capacities of zero-valent mercury of 20 mg adsorbents A-D ...

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Abstract

The invention relates to a method for activating and regenerating a mercury-removing adsorbent for metal sulfides. The main body of metal sulfides is moderately soaked in an activation solution composed of a divalent copper salt solution, followed by separation, cleaning and drying to complete the process. Activation of the sorbent, which is then used to adsorb mercury from the gas stream. When the adsorbent is deactivated due to adsorption saturation of mercury, the adsorbed mercury is released through heat treatment, and mercury is recovered as a resource. The heat-treated adsorbent is immersed in the activation solution again to complete the regeneration of metal sulfides. Compared with the prior art, in addition to the synthesized metal sulfide, the present invention can also directly use cheap natural metal sulfide ore as the main body of the adsorbent. The mercury adsorption performance of metal sulfides can be greatly enhanced by activation, and at the same time, the regeneration of metal sulfides after mercury adsorption can be realized. While achieving high-efficiency capture of flue gas mercury, the amount of adsorbent is greatly reduced, thereby reducing the consumption cost of adsorbent and the implementation difficulty of adsorption and mercury removal technology.

Description

technical field [0001] The invention relates to an adsorbent preparation method in the field of environmental protection, in particular to an adsorbent activation method capable of enhancing the mercury adsorption performance of metal sulfides. Background technique [0002] The Minamata Convention on Mercury, an international convention aimed at controlling global mercury pollution, came into force in 2017. As the world's largest mercury emitter, my country is facing severe pressure to implement the contract. Non-ferrous metal smelting is the most important source of atmospheric mercury emissions in my country, and it is also an industry that clearly requires mercury emission reduction in the Convention. Therefore, exploring efficient and economical mercury emission reduction technologies will provide strong technical support for my country to implement the mercury convention. [0003] Mercury in smelting flue gas mainly exists in three forms, namely gaseous zero-valent me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/34B01D53/02
CPCB01D53/02B01D2257/602B01J20/3433B01J20/3475
Inventor 瞿赞晏乃强徐浩淼廖勇全宗文
Owner SHANGHAI JIAOTONG UNIV
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