Preparation method and application of magnetic adsorbent for efficiently removing elemental mercury and hydrogen sulfide

A magnetic adsorbent and elemental mercury technology, applied in the field of flue gas purification, can solve the problems of no mercury removal technology, restricted application, high price, etc., achieve good collection and recycling conditions, fast mercury adsorption rate, high adsorption rate Effect

Pending Publication Date: 2021-12-17
QINGDAO TECHNOLOGICAL UNIVERSITY
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, in coal-fired power plants, it is generally possible to remove part of the mercury in the flue gas by mixing coal or doping the coal with other oxidants and ESP, SCR and other equipment. In the prior art, some activated carbons and calcium-based substances have been used in research. Catalysts such as metals or metal oxides can remove mercury, but there is no mature mercury removal technology that can be widely applied
The activated carbon adsorbents that have been put into commercial use are expensive, which restricts their application in the field of mercury removal; although noble metal catalysts can promote the oxidation of mercury at low temperatures, their high cost is difficult to be adopted by the industry, so looking for a A more reasonable adsorbent is an urgent task

Method used

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  • Preparation method and application of magnetic adsorbent for efficiently removing elemental mercury and hydrogen sulfide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The present invention, the preparation method of magnetic adsorbent, specifically comprises the following steps:

[0035] The first step is to wash and air-dry the salvaged Enteromorpha, grind it into 100-mesh particles, weigh 10g of Enteromorpha and add it to a sodium alginate solution with an optimal concentration of 0.03mol / L, and stir it magnetically;

[0036] In the second step, after magnetic stirring for 4 hours, drop into 1 L of ferric nitrate solution with a concentration of 0.1 wt%, and then freeze-dry the obtained sample in a vacuum freeze dryer for 24 hours;

[0037] The third step is to put the sample taken out into a fixed bed and set the pyrolysis temperature to 600°C for 0.5h, during which a nitrogen protective gas with a flow rate of 1L / min is introduced;

[0038] In the fourth step, 100ppm of H 2 S gas is passed through the fixed bed for 1 hour, and then 1 L / min nitrogen flow is used for flushing for 0.5 hour to obtain the magnetic adsorbent.

[0039...

Embodiment 2

[0045] The difference from Example 1 is:

[0046] The pyrolysis temperature in the third step is 650°C.

[0047] The magnetic adsorbent prepared in this example was subjected to a mercury removal experiment. The specific steps were the same as in Example 1. After 1 hour of reaction, the removal efficiency of elemental mercury reached 95%, and the obtained sample was magnetic both before and after the reaction.

Embodiment 3

[0049] The difference from Example 1 is:

[0050] The pyrolysis temperature in the third step is 750°C.

[0051] The magnetic adsorbent prepared in this example was subjected to a mercury removal experiment. The specific steps were the same as in Example 1. After 1 hour of reaction, the removal efficiency of elemental mercury reached 93%, and the obtained sample was magnetic both before and after the reaction.

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Abstract

The invention discloses a preparation method and application of a magnetic adsorbent for efficiently removing elemental mercury and hydrogen sulfide, and belongs to the technical field of flue gas purification. The preparation method comprises the following steps: firstly, pretreating enteromorpha, conducting grinding to form particles, adding the particles into a sodium alginate solution, and fully conducting stirring; adding a ferric nitrate solution into the solution obtained after stirring, and conducting freeze-drying in a vacuum freeze-drying machine; and putting the sample into a fixed bed for pyrolysis, conducting cooling after the pyrolysis is finished, introducing hydrogen sulfide gas into the fixed bed after the sample is cooled to a certain temperature, and conducting flushing with nitrogen flow to obtain the magnetic adsorbent. According to the method, the marine pollutant enteromorpha is used as a raw material, so that the reutilization of the marine pollutant is realized. Harmful gas hydrogen sulfide is consumed and converted in the preparation process of the magnetic adsorbent, that is, the prepared magnetic adsorbent can achieve efficient mercury adsorption rate while the hydrogen sulfide gas is removed, and the real-time mercury removal efficiency can reach 93% or above.

Description

technical field [0001] The invention belongs to the technical field of flue gas purification, and in particular relates to a preparation method and application of a magnetic adsorbent for removing hydrogen sulfide and elemental mercury. Background technique [0002] In recent years, various global problems caused by mercury pollution have attracted worldwide attention. Although the concentration of trace element mercury emitted in coal-fired flue gas is very low (on the order of ppm), due to the high consumption of coal in my country and the enrichment characteristics of trace elements, the mercury released into the atmosphere is harmful to the environment and human beings. It has caused serious harm to health and has become one of the heavy metal pollutants of global concern. Therefore, the control of mercury is imperative. [0003] Mercury is a chemical element and cannot be destroyed. The main form of mercury is elemental mercury. Elemental mercury has the characteristic...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/28B01J20/30B01D53/02
CPCB01J20/24B01J20/06B01J20/28009B01J20/28054B01D53/02B01D2258/0283B01D2257/602B01D2257/304
Inventor 刘亭张华伟李利峰
Owner QINGDAO TECHNOLOGICAL UNIVERSITY
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