Preparation method of magnetic activated carbon and application of magnetic activated carbon in flue gas demercuration

A magnetic activated carbon and activated carbon technology, applied in separation methods, chemical instruments and methods, and other chemical processes, can solve the problems of cumbersome and complicated steps, difficult control, and long reaction time, and achieve good dispersion, easy control, and adsorption performance. long-lasting effect

Pending Publication Date: 2022-04-15
YANGZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage is that the reaction time is long, the steps are cumbersome and complicated, and it is not easy to control

Method used

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  • Preparation method of magnetic activated carbon and application of magnetic activated carbon in flue gas demercuration
  • Preparation method of magnetic activated carbon and application of magnetic activated carbon in flue gas demercuration
  • Preparation method of magnetic activated carbon and application of magnetic activated carbon in flue gas demercuration

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preparation example Construction

[0027] The preparation method of magnetic activated carbon comprises the steps:

[0028] (1) Weigh activated carbon, soluble iron salt, nickel soluble salt and zinc soluble salt in proportion, dissolve them in absolute ethanol or deionized water, stir well to obtain a mixed solution,

[0029] (2) Calcining the mixed solution obtained in step (1) at 300-500° C. for 1-4 hours in a nitrogen atmosphere, stopping heating, cooling to room temperature in a nitrogen atmosphere, and obtaining magnetic activated carbon.

[0030] Further, in step (1), the molar ratio of nickel, zinc and iron is 1:1:4. Under this molar ratio, NiFe 2 o 4 Ni in 2+ Ions are Zn 2+ Partial substitution of ions can generate magnetic nanoparticles Ni 0.5 Zn 0.5 Fe 2 o 4 , Ni 0.5 Zn 0.5 Fe 2 o 4 The saturation magnetization is the largest, compared to NiFe 2 o 4 With better performance and lower cost.

[0031] The mass ratio of iron to activated carbon is 1:5~1:8. Preferably, the mass ratio of iron...

Embodiment 1

[0040] 1. Preparation of Magnetic Activated Carbon Materials

[0041] Take the raw material according to the following weight: iron nitrate nonahydrate (Fe(NO 3 ) 3 9H 2 O) 6.90g, nickel nitrate hexahydrate (Ni(NO 3 ) 2 ·6H 2 O) 1.24g, zinc nitrate hexahydrate (Zn(NO 3 ) 2 ·6H 2 O) 1.26g, activated carbon 4.78g, (Fe:AC=1:5).

[0042] Mix the weighed ferric nitrate nonahydrate, nickel nitrate hexahydrate, and zinc nitrate hexahydrate into absolute ethanol, stir evenly, add activated carbon, and then stir on a magnetic stirrer for a certain period of time to mix uniformly to obtain a mixed solution. In the present invention, the stirring speed is 200 r / min, and the stirring time is 6 h.

[0043] Put the uniformly stirred mixed solution in a tube furnace under a nitrogen atmosphere, raise the temperature to a certain temperature at a certain heating rate and calcinate for a period of time to obtain magnetic activated carbon, which is recorded as Ni 0.5 Zn 0.5 Fe 2 o ...

Embodiment 2

[0050] 1. Preparation of Magnetic Activated Carbon Materials

[0051] Take the raw material according to the following weight: iron nitrate nonahydrate (Fe(NO 3 ) 3 9H 2 O) 6.90g, nickel nitrate hexahydrate (Ni(NO 3 ) 2 ·6H 2 O) 1.24g, zinc nitrate hexahydrate (Zn(NO 3 ) 2 ·6H 2 O) 1.26g, activated carbon 5.74g, (Fe:AC=1:6).

[0052] Mix the weighed ferric nitrate nonahydrate, nickel nitrate hexahydrate, and zinc nitrate hexahydrate into absolute ethanol, stir evenly, add activated carbon, and then stir on a magnetic stirrer for a certain period of time to mix uniformly to obtain a mixed solution. In the present invention, the stirring speed is 200 r / min, and the stirring time is 6 h.

[0053] The uniformly stirred mixed solution was placed in a tube furnace under a nitrogen atmosphere, and the calcination heating rate was 5°C / min, the calcination temperature was 400°C, and the calcination time was 2 h. After the reaction, the magnetic activated carbon was recorded as...

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Abstract

The invention discloses a preparation method of magnetic activated carbon and application of the magnetic activated carbon in flue gas demercuration, and relates to the technical field of composite material preparation, and the preparation method comprises the following steps: (1) proportionally weighing activated carbon, soluble salt of iron, soluble salt of nickel and soluble salt of zinc, dissolving in absolute ethyl alcohol or deionized water, and uniformly stirring to obtain a mixed solution, and (2) roasting the mixed solution obtained in the step (1) in a nitrogen atmosphere at 300-500 DEG C for 1-4 hours, stopping heating, and cooling to room temperature in the nitrogen atmosphere to obtain the magnetic activated carbon. The magnetic medium in the magnetic activated carbon material is the Ni0. 5Zn0. 5Fe2O4 nano material, the magnetic property is higher, the dispersity is good, the adsorption performance is more durable and stable, and due to the existence of Ni, Zn and Fe elements, the mercury removal performance of the magnetic activated carbon is enhanced, and magnetic separation and recycling are easier.

Description

technical field [0001] The invention relates to the technical field of composite material preparation, in particular to a preparation method of a magnetic activated carbon material and its application in flue gas mercury removal. Background technique [0002] Mercury is a toxic heavy metal element and a neurotoxin that poses a great threat to human health. As the largest coal consumer in the world, my country has become increasingly serious about mercury pollution caused by coal combustion. Activated carbon injection for mercury removal from coal-fired flue gas is the most effective and convenient mercury removal technology in recent years. However, the technical bottleneck of the activated carbon injection mercury removal treatment technology is that the activated carbon after adsorbing mercury cannot be recycled, and the cost is high, which has a certain impact on the operation of environmental protection facilities such as dust removal, and the residual carbon index will...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/20B01J20/28B01J20/30B01D53/64B01D53/81B01D53/02
Inventor 曾勇平郭孔鲁许月阳
Owner YANGZHOU UNIV
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