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Magnetic adsorbent for removing Hg0 from flue gas and preparation and application of magnetic adsorbent

A magnetic adsorbent and flue gas technology, applied in the direction of gas treatment, other chemical processes, chemical instruments and methods, etc., can solve the problems of high application cost, difficult regeneration, rare adsorbents, etc., to reduce production costs, desorb Effects of high mercury efficiency and reduced usage costs

Active Publication Date: 2015-04-22
DONGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The adsorbent in this patent is a mixture, but it is not easy to regenerate
[0009] To sum up: In recent years, domestic and foreign research on the removal of Hg 0 There are many invention patents for new catalyst preparation methods, but there are few adsorbents that can regenerate the adsorbent
Although there are invention patents on the preparation of efficient or cheap adsorbents, their application costs are too high and do not involve the regeneration and recycling of adsorbents

Method used

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  • Magnetic adsorbent for removing Hg0 from flue gas and preparation and application of magnetic adsorbent
  • Magnetic adsorbent for removing Hg0 from flue gas and preparation and application of magnetic adsorbent

Examples

Experimental program
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Embodiment 1

[0037] (1) Dissolve 2.51g (9mmol) FeCl in 20ml water 3 ·6H 2 O, 1.25g (4.5mmol) FeSO 4 ·7H 2 O, stir, then add 1.5 mol L -1 NH 3 ·H 2 O (10mL), the color of the solution turned black and the black solid product was precipitated to the bottom, the precipitate was washed alternately with 20ml distilled water and 20ml ethanol to remove unreacted chemical substances in the precipitate, and finally Fe was obtained 3 O 4 Nanoparticles.

[0038] (2) The above Fe 3 O 4 Nanoparticles were placed in deionized water, added with Na 2 SiO 3 , to obtain the Si layer Fe 3 O 4 Nanoparticles, added to ethanol followed by NH 3 ·H 2 After the sol-gel reaction of O, steam treatment, and drying to obtain silica-coated magnetic particles; wherein Fe 3 O 4 Nanoparticles, Na 2 SiO 3 , ethanol, NH 3 ·H 2 The proportional relationship of O is: 1gFe 3 O 4 Nanoparticles, 10g Na 2 SiO 3 , 15mLNH 3 ·H 2 O, 10ml ethanol.

[0039] (3) uniformly stirring the copper nanoparticles and...

Embodiment 2

[0043] The specific production and application methods are as shown in the accompanying drawings. figure 2 As shown in the figure, the coal-fired flue gas passes through the filter material, and the mercury in the flue gas is captured by the magnetic adsorbent in the filter material, and the used adsorbent and fly ash are separated by magnetic separation, and the clean fly ash can be sold to The concrete industry, while the separated magnetic adsorbent MagFeSi-Cu 0 It will continue to be used after the regeneration cycle, so the cost of using the adsorbent will be reduced.

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Abstract

The invention relates to a magnetic adsorbent for removing Hg0 from flue gas and preparation and application of the magnetic adsorbent. The magnetic adsorbent is MagFeSi-Cu0. The preparation method includes the first step of putting Fe3O4 nano particles in deionized water, adding Na2SiO3, adding a mixture into ethyl alcohol, adding NH3*H2O for a sol-gel reaction, conducting steam treatment and conducting drying to obtain magnetic particles of a silicon dioxide coating; the second step of introducing copper nano particles into the surface of silicon iron and sintering the magnetic particles of the silicon dioxide coating and the silicon iron to obtain the magnetic adsorbent. The magnetic adsorbent is applied to removing Hg0 from the flue gas. An adsorbent of mercury is the magnetic adsorbent, the coal-fired flue gas passes through a filter material, the mercury in the flue gas is caught by the magnetic adsorbent in the filter material, a dry drum magnetic separator is used for adsorbent spending and flying ash extraction, the used magnetic adsorbent MagFeSi-Cu0 will be regenerated and cycled, and therefore use cost of the adsorbent will be lowered.

Description

technical field [0001] The invention belongs to the field of flue gas remover and its preparation and application, in particular to a method for removing Hg from flue gas 0 Magnetic adsorbents and their preparation and application. Background technique [0002] There are three main forms of mercury in coal-fired flue gas: gaseous elemental mercury Hg 0 (g), gaseous divalent mercury Hg 2+ (g), solid particulate mercury Hg (p). For gaseous mercury only, gaseous elemental mercury Hg 0 (g) Predominant form of existence. Relevant studies have shown that most of the gaseous mercury at the boiler flue gas outlet is Hg 0 (g). These pollutants are harmful to human health and the environment. In order to reduce the impact of these pollutants, they must be removed from the environment before entering the environment with the flue gas. Powdered activated carbons exhibit excellent mercury removal efficiency commercially, however a major problem with activated carbon adsorbents is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/06B01J20/28B01J20/30B01D53/81B01D53/64
CPCB01D53/02B01D2253/1122B01D2253/1124B01D2257/602B01J20/02B01J20/06B01J20/28009
Inventor 刁永发王静泓刘静
Owner DONGHUA UNIV
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