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Absorbent, and preparation method and mercury removal method thereof

An absorbent and removal technology, which is applied in the field of boilers, can solve the problems of difficult recovery, poor apparent magnetic properties of catalysts, and large dosage, so as to achieve the effect of cost saving

Active Publication Date: 2016-12-07
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Moreover, the catalyst in the current absorbent has poor apparent magnetic properties, is not easy to recycle, has a large amount of use, and is expensive.

Method used

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  • Absorbent, and preparation method and mercury removal method thereof
  • Absorbent, and preparation method and mercury removal method thereof
  • Absorbent, and preparation method and mercury removal method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] Weigh 30.7g of potassium hydrogen persulfate, dissolve it in 100L water, stir, mix well, and use 0.1mol / L Na 2 CO 3 -NaHCO 3 Adjust the pH value of the buffer solution to 8, and then add 8.297 g of cobalt ferrite as a catalyst. At this time, the weight ratio of potassium monopersulfate to the catalyst is 3.7:1, and the absorbent can be obtained by stirring. When the concentration of elemental mercury in flue gas is 100 μg / m 3 When the reaction temperature is 55 ° C; the reaction pH is 8, in the bubble reactor, the gas-liquid contact time is 0.5 seconds, and the elements in the flue gas are measured by the QM201H coal-fired flue gas mercury detector (Suzhou Qingan Instrument Co., Ltd.) The removal rate of mercury can reach 85%.

Embodiment 2

[0059] 1) Weigh 0.188g of graphite oxide and add it into 70mL of water, and ultrasonicate for 2.5 hours to form a uniformly dispersed suspension; 0.3493g of Co(NO 3 ) 2 ·6H 2 O and 0.9696gFe(NO 3 ) 3 9H 2 Dissolve O in 10mL deionized water to form a yellow solution and mix it with the suspension containing graphite oxide. Stir magnetically for 30 minutes to mix the two substances evenly. Use NaOH (6mol / L) to adjust the pH of the solution to greater than 12 and continue magnetic stirring. After 30 minutes, it was transferred to a 100mL hydrothermal reaction kettle and placed in an oven at 200°C for 12 hours. Cool to room temperature after the end, centrifuge and wash several times, and repeatedly wash with absolute ethanol to remove impurities therein, and finally dry in a vacuum oven at 60°C to obtain a 40% graphite-loaded cobalt ferrite catalyst (referred to as CoFe 2 o 4 -GO (0.4)), the graphite-supported ene cobalt ferrite catalyst obtained by measuring carries out X ...

Embodiment 3

[0062] 1) Prepare a graphite-supported cobaltene ferrite catalyst with a loading of 10% in the same manner as in Example 2, and adjust the proportion of the used substances according to the finally obtained loading.

[0063] 2) Weigh 60g of potassium hydrogen persulfate, dissolve it in 100L of water, stir, mix well, and use 0.1mol / L Na 2 CO 3 -NaHCO 3 The buffer solution adjusts the pH value to 5.5, and then adds 60 g of the graphene-loaded cobalt ferrite catalyst prepared in step 1) (the load is 10%). At this time, the weight ratio of potassium monopersulfate to the catalyst is 1:1, and stirring can obtain absorbent. When the concentration of elemental mercury in flue gas is 10 μg / m 3 When the reaction temperature is 25°C; the reaction pH is 5.5, in the bubble reactor, the gas-liquid contact time is 0.5 seconds, and the removal rate of elemental mercury in the flue gas measured by the QM201H coal-fired flue gas fluorescence mercury detector reaches 80 %.

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Abstract

The invention discloses an absorbent, and a preparation method and a mercury removal method thereof. The absorbent comprises a mixture of an oxidation additive and a magnetic catalyst, wherein the weight ratio of the oxidation additive to the magnetic catalyst is (1 to 19):1; the mixture exists in a water solution; the concentration of the oxidation additive is 0.248 to 6.49g / L; the concentration of the magnetic catalyst is 0.048 to 0.6g / L. The preparation method comprises the following steps of weighing a proper quantity of oxidation additive and magnetic catalyst; then, adding the weighed oxidation additive into water, regulating the pH value, and obtaining an oxidation additive solution; finally, adding the magnetic catalyst into the oxidation additive solution to obtain the absorbent. The absorbent has the advantages that elemental state mercury in smoke gas can be effectively removed; the mercury removal efficiency is high; the cost is low; the obtaining is easy; the apparent magnetism of the catalyst is high; the recovery is easy; the dissolved ions are few; the secondary pollution is avoided; the consumption is little; the cost is reduced.

Description

technical field [0001] The invention relates to the technical field of boilers, in particular to an absorbent, a preparation method thereof and a mercury removal method. Background technique [0002] Mercury is a toxic trace element that accumulates in the human body and poses a huge threat to human health. Therefore, mercury pollution has attracted widespread attention, and coal burning is an important source of atmospheric mercury emissions in my country. The "Emission Standards of Air Pollutants for Thermal Power Plants" (GB 13223-2011), released in July 2011, added the emission standards for heavy metal mercury for the first time, stipulating that the emission standards for mercury and mercury compounds in coal-fired power plants shall not exceed 0.03mg / m 3 . It is generally believed that there are three main forms of mercury in coal-fired flue gas: elemental mercury (Hg 0 ), oxidized mercury (Hg 2+ ) and particulate mercury (Hg p ). Among them, oxidized mercury (Hg...

Claims

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Application Information

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IPC IPC(8): B01D53/86B01D53/64B01J23/75B01J23/745
CPCB01D53/8665B01J23/745B01J23/75B01D2258/0283B01J35/33
Inventor 马宵颖赵毅许佩瑶刘永春
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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