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Nitrogen-doped activated carbon-based desulfurizing agent as well as preparation method and application thereof

A technology of activated carbon and nitrogen doping, applied in chemical instruments and methods, removal of gas pollutants, inorganic chemistry, etc., to achieve enhanced chemical activity, simplified desulfurization process, and efficient removal effects

Pending Publication Date: 2022-02-18
BAOSHAN IRON & STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the defects existing in the prior art, the object of the present invention is to provide a nitrogen-doped activated carbon-based desulfurizer and its preparation method and application. As the carrier, the metal salt is used as the active component, and it is calcined in an inert gas atmosphere; the nitrogen-doped activated carbon-based desulfurizer can not only efficiently remove sulfur-containing pollutants from blast furnace gas under normal and low temperature conditions, but also N- The AC-based desulfurizer is green and environmentally friendly. It does not need any treatment after deactivation. It can be directly mixed with sintered material for iron and steel smelting, which not only eliminates the pollution caused by the deactivation and regeneration of the desulfurizer, but also realizes resource utilization.

Method used

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preparation example Construction

[0048] The preparation method of the above-mentioned nitrogen-doped activated carbon-based desulfurizer is obtained by calcining under an inert gas atmosphere with modified nitrogen-doped activated carbon as the carrier and metal salt as the active component; the preparation method of the nitrogen-doped activated carbon-based desulfurizer Include the following steps:

[0049] S1, preparing modified nitrogen-doped activated carbon, specifically including the following steps:

[0050] S11, activated carbon pretreatment, the activated carbon is ground to powder, washed with distilled water, washed several times until the turbidity of the supernatant is suspended, and the washed activated carbon powder is dried in an oven, and then dilute mineral acid is used at room temperature Pickling under conditions, remove the ash on the surface to get clean activated carbon, clean activated carbon after suction filtration, water washing to neutral, dry in an oven to get pretreated activated...

Embodiment 1

[0065] S1, preparing modified nitrogen-doped activated carbon, specifically including the following steps:

[0066] S11, activated carbon pretreatment, the activated carbon is ground, washed with water, dried, and pickled to obtain clean activated carbon, and the clean activated carbon is then subjected to suction filtration, washed with water to neutrality, and then dried in an oven to obtain pretreated activated carbon;

[0067] S12, preparing nitrogen-doped activated carbon, fully mixing pretreated activated carbon and nitrogen source at a mass ratio of 1:1, and calcining in an inert gas atmosphere to obtain nitrogen-doped activated carbon;

[0068] The nitrogen source is melamine; the inert gas is nitrogen or argon; the heating rate during the calcination process is 10°C / min, the calcination temperature is 700°C, and the calcination time is 3h.

[0069] S13, prepare modified nitrogen-doped activated carbon, put nitrogen-doped activated carbon in a beaker, slowly add mixed ...

Embodiment 2

[0077] S1, preparing modified nitrogen-doped activated carbon, specifically including the following steps:

[0078] S11, activated carbon pretreatment, the activated carbon is ground, washed with water, dried, and pickled to obtain clean activated carbon, and the clean activated carbon is then subjected to suction filtration, washed with water to neutrality, and then dried in an oven to obtain pretreated activated carbon;

[0079] S12, preparing nitrogen-doped activated carbon, fully mixing pretreated activated carbon and nitrogen source at a mass ratio of 1:1, and calcining in an inert gas atmosphere to obtain nitrogen-doped activated carbon;

[0080] The nitrogen source is melamine; the inert gas is nitrogen or argon; the heating rate during the calcination process is 10°C / min, the calcination temperature is 700°C, and the calcination time is 3h.

[0081] S13, prepare modified nitrogen-doped activated carbon, put nitrogen-doped activated carbon in a beaker, slowly add mixed ...

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Abstract

The invention discloses a nitrogen-doped activated carbon-based desulfurizing agent and a preparation method and application thereof. The nitrogen-doped activated carbon-based desulfurizing agent is prepared by calcining modified nitrogen-doped activated carbon serving as a carrier and metal salt serving as an active component in an inert gas atmosphere. The nitrogen-doped activated carbon-based desulfurizing agent comprises the following components in percentage by mass: 80%-99% of modified nitrogen-doped activated carbon and 1%-20% of a metal oxide. The nitrogen-doped activated carbon-based desulfurizing agent can be applied to removal of a mixed gas of carbonyl sulfide and hydrogen sulfide. The nitrogen-doped activated carbon-based desulfurizing agent can efficiently remove sulfur-containing pollutants in blast furnace gas under normal and low temperature conditions, is green and environment-friendly, does not need any treatment after being inactivated, and can be directly mixed with a sintered material for steel smelting, so the problem of pollution caused by inactivation and regeneration of the desulfurizing agent is eliminated, and resource utilization is realized.

Description

technical field [0001] The invention relates to the field of air pollution control, in particular to a nitrogen-doped activated carbon-based desulfurizer and its preparation method and application, which are mainly used for removing sulfur-containing pollutants in blast furnace waste. Background technique [0002] Blast furnace gas is a secondary energy source produced in the process of ironmaking. However, due to the high concentration of sulfur pollutants (mainly carbonyl sulfide and hydrogen sulfide) in blast furnace gas, the concentration of sulfur dioxide in flue gas after combustion exceeds the emission standard of the iron and steel industry, which seriously affects the Its secondary utilization; in addition, due to the characteristics of low temperature, large gas volume, low calorific value, and special composition of blast furnace gas, the blast furnace gas desulfurization technology and corresponding industrial equipment in the iron and steel industry have not yet ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B32/354C10K1/32C10K1/20
CPCC01B32/354C10K1/004C10K1/32C10K1/20
Inventor 李咸伟刘道清张永忠俞勇梅胡子国孙同华陈健梁键星
Owner BAOSHAN IRON & STEEL CO LTD
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