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A magnetic regenerable adsorbent for adsorbing gaseous zero-valent mercury and its preparation method

An adsorbent and magnetic technology, applied in the field of magnetic renewable adsorbent and preparation, can solve the problems of poor thermal stability and unfavorable recycling of maghemite sulfide, and achieve excellent adsorption performance, good thermal stability and simple separation method. Effect

Active Publication Date: 2020-12-29
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the process of overcoming the secondary pollution of mercury and combining maghemite sulfide with wet electrostatic precipitator to centrally control mercury pollution in coal-fired flue gas, maghemite sulfide has poor thermal stability and is not conducive to circulation. problem of use

Method used

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  • A magnetic regenerable adsorbent for adsorbing gaseous zero-valent mercury and its preparation method
  • A magnetic regenerable adsorbent for adsorbing gaseous zero-valent mercury and its preparation method
  • A magnetic regenerable adsorbent for adsorbing gaseous zero-valent mercury and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Example 1MoS x @γ-Fe 2 o 3 Sorbent preparation

[0041] (1) 20g / L phosphomolybdic acid solution and magnetite are mixed, stirred for 12h, wherein, the mass ratio of the dosage of magnetite and phosphomolybdic acid is 2:3;

[0042] (2) The mixed solution obtained in step (1) is subjected to solid-liquid separation, the solid obtained by solid-liquid separation is washed and dried, and then the solid is roasted at 500°C for 3 hours to obtain MoO 3@γ-Fe 2 o 3 Adsorbent;

[0043] (3) get the MoO that 250mg step (2) prepares 3 @γ-Fe 2 o 3 The adsorbent is placed in a fixed-bed reactor, and hydrogen sulfide is passed through at 350°C for 1 hour (flow rate 500mL / min) to obtain MoS x @γ-Fe 2 o 3 Adsorbent, labeled as Adsorbent A.

Embodiment 2

[0044] Example 2 sulfurized γ-Fe 2 o 3 Sorbent preparation

[0045] Take 250mg of gamma-Fe 2 o 3 Place it in a fixed bed reactor and treat it with hydrogen sulfide gas at 350°C for 1 hour to obtain sulfide γ-Fe 2 o 3 Sorbent, labeled Sorbent B.

Embodiment 3

[0046] Example 3 Adsorption of gaseous zero-valent mercury

[0047] Grind and sieve the adsorbents A and B prepared in Example 1 and Example 2, and take 40-60 mesh particles to evaluate the adsorption performance of gaseous zero-valent mercury on a fixed-bed reactor: the amount of adsorbents A and B Both are 20mg, the simulated flue gas composition is: [Hg 0 ] = 110 μg m -3 , nitrogen flow = 500mL min -1 , airspeed=1.5×10 6 cm 3 g -1 h -1 , reaction temperature = 40 ~ 100 ° C, adsorption time = 3h.

[0048] Determination of reactor outlet Hg 0 concentration, and calculate the Hg 0 The adsorption capacity and penetration rate are shown in Table 1.

[0049] Table 1 Hg of different samples 0 Adsorption amount (μg) and penetration rate

[0050]

[0051] It can be seen from Table 1 that under the same reaction conditions, the adsorption of adsorbent A to Hg 0 The adsorption performance of is significantly better than that of adsorbent B. Hg of adsorbent A at 60°C ...

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Abstract

The invention discloses a magnetic renewable adsorbent for adsorbing gaseous zero-valent mercury and a preparation method of the magnetic renewable adsorbent, and belongs to the technical field of mercury adsorption. The adsorbent is formed by performing phosphomolybdic acid (HPMo) grafting on magnetite (Fe3O4) in a preparation process to form HPMo@Fe3O4, then performing high-temperature calcination to obtain MoO3@gamma-Fe2O3, and finally performing vulcanization modification. The phase change of maghemite is inhibited by a means of phosphomolybdic acid grafting, so as to improve the thermal stability of maghemite, and the magnetic property of maghemite is improved; meanwhile, the zero-valent mercury adsorption capacity of the phosphomolybdic acid grafted maghemite is improved by controlling the vulcanization effect of the surface of the phosphomolybdic acid grafted maghemite, the magnetic adsorbent which has excellent low-temperature zero-valent mercury adsorption capacity and can berecycled is prepared, and the magnetic adsorbent can be suitable for being combined with a wet-type electric precipitator to control mercury pollution of a coal-fired power plant in a centralized mode.

Description

technical field [0001] The invention relates to a magnetic regenerable adsorbent for adsorbing gaseous zero-valent mercury and a preparation method thereof, belonging to the technical field of mercury adsorption. Background technique [0002] The Minamata Convention, an international convention aimed at controlling and reducing mercury emissions on a global scale, has officially entered into force. my country, as a contracting party and the largest mercury emitter, is facing enormous pressure to implement the convention. Coal-fired power plants are the main source of mercury emissions in my country, accounting for about 40% of the total anthropogenic mercury emissions in my country. Mercury is mainly present in the form of zero-valent mercury (Hg 0 ), divalent mercury (Hg 2+ ) and particulate mercury (Hg p ) and other three forms exist. Divalent mercury and particulate mercury can be removed by wet desulfurization equipment and dust removal equipment in coal-fired power ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/06B01J20/28B01J20/30B01D53/02
CPCB01D53/02B01D2253/1124B01D2253/1128B01D2257/602B01J20/0266B01J20/06B01J20/28009B01J2220/4806
Inventor 杨士建梅剑王昶孙鹏翔胡启星
Owner JIANGNAN UNIV
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