A kind of zinc sulfide-based mercury adsorbent for capturing zero-valent mercury in flue gas and preparation method thereof

A zinc sulfide and adsorbent technology, applied in chemical instruments and methods, separation methods, gas treatment and other directions, can solve the problems of unfavorable fly ash reuse, low mercury adsorption capacity, difficult to popularize and apply, etc., and achieve good mercury removal performance. , simple process, low cost effect

Active Publication Date: 2022-02-22
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This type of method has good mercury removal efficiency, but it has strict requirements on the air intake, the operation cost is relatively expensive, and the absorption liquid used has certain safety risks, so it is difficult to popularize and apply
The other is the adsorption method. For coal-fired flue gas, the activated carbon adsorption method is the most mature mercury removal technology. However, its many shortcomings prevent it from being applied in other fields.
For example, the adsorption capacity of mercury is low, and the operation cost is expensive, which is not conducive to the reuse of fly ash and the reduction of SO 2 and H 2 O sensitive etc.
Transition metal oxides such as manganese oxides have the characteristics of low price and good mercury adsorption performance, which are sought after by scholars, but it is still difficult to overcome the easy SO 2 poisoning problem
Noble metal sorbents have excellent mercury removal capabilities, but are poorly economical

Method used

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  • A kind of zinc sulfide-based mercury adsorbent for capturing zero-valent mercury in flue gas and preparation method thereof
  • A kind of zinc sulfide-based mercury adsorbent for capturing zero-valent mercury in flue gas and preparation method thereof

Examples

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Effect test

Embodiment 1

[0029] A kind of cobalt doped zinc mercury sulfide adsorbent, its chemical formula is Co 0.1 Zn 0.9 S, its preparation method comprises the following steps:

[0030] 1) Weigh a certain amount of zinc nitrate, cobalt nitrate and sodium sulfide according to the molar ratio, and dissolve them in deionized water respectively

[0031] 2) Mix and stir the zinc nitrate and cobalt nitrate solutions, then slowly add the sodium sulfide solution dropwise into the mixed solution, and stir rapidly for 20 minutes

[0032] 3) Put the suspension into a stainless steel reaction kettle with a polytetrafluoroethylene liner, put it in an oven, heat it to 140°C, and keep it for 12 hours

[0033] 4) After the reaction kettle is naturally cooled, use deionized water to repeatedly perform centrifugal washing in a high-speed centrifuge

[0034] 5) Vacuum-dry the washed sample at 60° C. for 12 hours, grind and sieve to 100-200 mesh, and put it into a drying dish for use.

Embodiment 2

[0036] A kind of cobalt doped zinc mercury sulfide adsorbent, its chemical formula is Co 0.2 Zn 0.8 S, its preparation method comprises the following steps:

[0037] 1) Weigh a certain amount of zinc nitrate, cobalt nitrate and sodium sulfide according to the molar ratio, and dissolve them in deionized water respectively

[0038] 2) Mix and stir the zinc nitrate and cobalt nitrate solutions, then slowly add the sodium sulfide solution dropwise into the mixed solution, and stir rapidly for 20 minutes

[0039] 3) Put the suspension into a stainless steel reaction kettle with a polytetrafluoroethylene liner, put it in an oven, heat it to 140°C, and keep it for 12 hours

[0040] 4) After the reaction kettle is naturally cooled, use deionized water to repeatedly perform centrifugal washing in a high-speed centrifuge

[0041] 5) Vacuum-dry the washed sample at 60° C. for 12 hours, grind and sieve to 100-200 mesh, and put it into a drying dish for use.

Embodiment 3

[0043] A kind of cobalt doped zinc mercury sulfide adsorbent, its chemical formula is Co 0.3 Zn 0.7 S, its preparation method comprises the following steps:

[0044] 1) Weigh a certain amount of zinc nitrate, cobalt nitrate and sodium sulfide according to the molar ratio, and dissolve them in deionized water respectively

[0045] 2) Mix and stir the zinc nitrate and cobalt nitrate solutions, then slowly add the sodium sulfide solution dropwise into the mixed solution, and stir rapidly for 20 minutes

[0046] 3) Put the suspension into a stainless steel reaction kettle with a polytetrafluoroethylene liner, put it in an oven, heat it to 140°C, and keep it for 12 hours

[0047] 4) After the reaction kettle is naturally cooled, use deionized water to repeatedly perform centrifugal washing in a high-speed centrifuge

[0048] 5) Vacuum-dry the washed sample at 60° C. for 12 hours, grind and sieve to 100-200 mesh, and put it into a drying dish for use.

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Abstract

The invention relates to a zinc sulfide-based mercury adsorbent for trapping zero-valent mercury in flue gas and a preparation method thereof. The adsorbent is a cobalt-doped zinc mercury sulfide adsorption material Co x Zn 1‑x S, x represents the stoichiometric ratio of cobalt in the solution, and its ratio is 0.1‑0.3. Its preparation method is as follows: (1) dissolving a certain molar ratio of cobalt salt and zinc salt in deionized water to form a mixed solution; (2) adding a precipitant to the mixed solution for mixing and stirring; (3) putting the suspension into a reactor , and placing the reactor in an oven for heat treatment; (4) repeatedly washing the obtained precipitate with deionized water, and drying to form a zinc sulfide-based mercury-removing adsorption material. Compared with the prior art, the method has wide sources of raw materials, simple and controllable preparation process, mild reaction conditions, and the prepared adsorbent improves mercury absorption performance by dozens of times compared with pure zinc sulfide, and has good anti-SO 2 Affect performance, can maintain a certain high activity stably for a long time, especially suitable for adsorption and removal of zero-valent mercury in smelting flue gas.

Description

technical field [0001] The invention belongs to the fields of material science and mercury removal from industrial waste gas, and relates to a special mercury removal material, in particular to a cobalt-doped zinc sulfide adsorbent and a preparation method thereof. Background technique [0002] Mercury and its compounds are a class of toxic and harmful substances, and the harm caused by mercury pollution has become a hot issue of global concern. Coal combustion and smelting industries are the most important sources of mercury emissions. Mercury generally has three forms: gaseous zero-valent mercury (Hg 0 ), gaseous divalent mercury (Hg 2+ ) and particulate mercury (Hg p ). Divalent mercury has good water solubility and is easily washed in the wet flue gas purification process. Particle mercury can be mostly removed in the dust removal process, while Hg 0 It is highly inert, insoluble in water, and difficult to remove. Therefore, zero-valent mercury has become the focus ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/02B01J20/30B01D53/02
CPCB01D53/02B01J20/0225B01J20/0244B01J20/0285B01D2257/602B01D2258/0283
Inventor 晏乃强瞿赞刘伟李思超柯昱
Owner SHANGHAI JIAO TONG UNIV
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