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Zinc sulfide based mercury adsorbent for flue gas zero-valent mercury capturing and preparation method of zinc sulfide based mercury adsorbent

A zinc sulfide and zero-valent mercury technology, applied in chemical instruments and methods, separation methods, gas treatment, etc., can solve the problems of unfavorable fly ash reuse, difficult to overcome poisoning, high operating costs, etc., and achieve good mercury removal performance, The effect of low cost and simple preparation method

Active Publication Date: 2018-12-28
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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  • Zinc sulfide based mercury adsorbent for flue gas zero-valent mercury capturing and preparation method of zinc sulfide based mercury adsorbent
  • Zinc sulfide based mercury adsorbent for flue gas zero-valent mercury capturing and preparation method of zinc sulfide based mercury adsorbent

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 base mercury adsorbent for flue gas zero-valent mercury capturing and a preparation method of the zinc sulfide based mercury adsorbent. The adsorbent is a cobalt-doped zinc sulfide mercury adsorption material CoxZn1-xS, in the formula, x represents the stoichiometric ratio of cobalt in a solution, and the stoichiometric ratio is 0.1-0.3. The preparation method comprises the following steps: (1) dissolving a cobalt salt and a zinc salt of a certain mole ratio into deionized water so as to obtain a mixed solution; (2) mixing and stirring the mixed solutionwith a precipitant; (3) putting a suspension liquid into a reactor, and carrying out heating treatment on the reactor in a baking oven; (4) repeatedly washing the obtained precipitate with deionizedwater, and drying, thereby obtaining the zinc sulfide based mercury adsorbent. Compared with the prior art, the preparation method is wide in raw material source, simple and controllable in preparation process and gentle in reaction condition, and the prepared adsorbent has a mercury adsorption capability which is improved by dozens of times when being compared with pure zinc sulfide, in additionhas a very good anti-SO2 influence property, is capable of maintaining certain high activity within a long time, and is particularly applicable to adsorption and removal of zero-valent mercury in a metallurgical 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 Applications(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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