Oxidization-state mercury selective adsorbent and preparation method

A technology of oxidized mercury and adsorbents, applied in chemical instruments and methods, separation methods, alkali metal oxides/hydroxides, etc., to achieve small artificial introduction errors, good sulfur and water resistance, and simple post-processing and analysis. Effect

Active Publication Date: 2018-07-06
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the adsorbents in the existing adsorption tubes are easily affected by flue gas components, especially SO 2 Therefore, the adsorption tube off-line sampling method is mostly used in the clean flue gas sampling after desulfurization

Method used

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  • Oxidization-state mercury selective adsorbent and preparation method
  • Oxidization-state mercury selective adsorbent and preparation method
  • Oxidization-state mercury selective adsorbent and preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Weigh 16.4g Ca(NO 3 ) 2 and 6g of mesoporous SiO 2 The powder was added to 100ml of deionized water, and stirred with a magnetic stirrer at room temperature for 6 hours, and then the mixed solution was placed in an oven at 105°C for 12 hours, and completely dried; the dried sample was placed in a nitrogen atmosphere at Calcined at 750°C for 4 hours to obtain massive solids; grind the solids on a mortar and pass through a 18-24 mesh sieve to obtain the corresponding solid particles, which are adsorbent 1, and store the adsorbent 1 in silica gel spare.

[0035] Weigh 16.4g Ca(NO 3 ) 2 , 7.45g KCl and 6g mesoporous SiO 2 The powder was added to 100ml of deionized water, and stirred with a magnetic stirrer at room temperature for 6 hours, and then the mixed solution was placed in an oven at 105°C for 12 hours, and completely dried; the dried sample was placed in a nitrogen atmosphere at Calcined at 750°C for 4 hours to obtain blocky solids; grind the solids on a morta...

Embodiment 2

[0040] Adsorbents 3, 4, and 5 in Example 1 were selected to verify their mercury adsorption performance on a fixed-bed adsorption test bench. The fixed bed adsorption device consists of five parts: simulated flue gas generation system, mercury vapor generation system, quartz tube reactor, mercury measurement system and tail gas treatment device. Hg of the adsorbent 0 The adsorption performance is evaluated, the elemental mercury source produces constant mercury vapor, which is brought into the reactor by high-purity nitrogen, and the inlet mercury concentration is 34±2μg / m 3 . The inner diameter of the quartz tube reactor is 8 mm, the amount of adsorbent used is 300 mg, and the bed height is about 8 mm. The adsorption temperature is 120°C, the total gas volume is 2L / min, the gas component is pure nitrogen, and the adsorption time is 80min. The adsorption performance of elemental mercury is determined by Hg 0 The penetration rate is defined as the ratio of the mercury conce...

Embodiment 3

[0043] Adsorbents 1, 2, and 4 in Example 1 were treated with a certain amount of water vapor under ambient conditions, and the crystal structures of the three adsorbents were analyzed using an ARL X'TRA type X-ray diffractometer (Thermo, U.S.). Determination, experimental condition parameters: Cu target (Kα ray, ), Ni filter, the tube voltage is 40kV, the current through the tube is 30mA, scan at a speed of 0.1° / S in the range of 10-80° and use Jade 6.0 software to fit the spectrum to obtain an accurate crystal structure .

[0044] exist figure 1 It can be clearly observed in the XRD characterization results of the three adsorbents that CaO and Ca(OH) 2 Diffraction peaks, under the same treatment conditions, the oxidized mercury selective adsorbent of the present invention retains more CaO, while there are more Ca(OH) in the other two adsorbents 2 , indicating that water vapor interacted with CaO in the two adsorbents. At the same time, it also shows that the adsorbent is...

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Abstract

The invention discloses an oxidization-state mercury selective adsorbent and a preparation method. The adsorbent takes CaO, KCl and NaOH as main components and SiO2 as a supporting framework; mesoporous SiO2 powder, Ca(NO3)2, KCl and NaOH are added into de-ionized water, and are stirred and dried; then a mixture is calcined under a nitrogen gas atmosphere and an obtained block-shaped sold is ground on a mortar to obtain the oxidization-state mercury selective adsorbent. The oxidization-state mercury selective adsorbent is prepared by utilizing a chemical impregnation method; the adsorbent cannot completely adsorb element-state mercury and has a very high directional adsorption capability on oxidization-state mercury; the adsorbent has relatively good sulfur resistance and moisture resistance and can be applied to an industrial process for separating mercury with different forms.

Description

technical field [0001] The invention belongs to the field of separation of mercury forms in industrial boiler waste gas and measurement of valence mercury, and relates to an oxidized mercury selective adsorbent and a preparation method thereof. Background technique [0002] Mercury is a highly volatile and highly toxic heavy metal trace element. It mainly includes natural sources and man-made sources. Man-made sources include metal smelting, cement production, waste incineration, chlor-alkali industry, coal-fired boilers and other industrial processes. With the acceleration of industrial development, the pollution problem caused by mercury emissions has become increasingly serious. In order to limit the excessive emissions of mercury, many countries and regions around the world have successively formulated relevant laws, regulations and industry standards. [0003] Mercury produced in industrial processes mainly includes gaseous elemental mercury (Hg 0 ), vapor phase mercur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/10B01J20/04B01J20/28B01J20/30B01D53/02
CPCB01D53/02B01D2257/602B01D2258/0283B01J20/041B01J20/103B01J20/28016
Inventor 段钰锋李春峰汤红健朱纯郑逸武姚婷
Owner SOUTHEAST UNIV
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