Method for eliminating carbon dioxide in gas through steel slag adsorption

Abstract

The invention relates to a method for eliminating carbon dioxide in smoke gas through steel slag adsorption. The method has the advantages of low raw material cost, discharge source approaching, no need of pretreatment, high reaction speed, mild reaction conditions and the like. The steel slag has great surface area and a great number of micro-mesopore structures; the steel slag shows the porous honeycomb-shaped structures in a microscope; a good adsorption effect is realized. The steel slag and the active carbon are proportioned, so that the adsorption effect of carbon dioxide can be improved; the adsorption cost can also be reduced. The method comprises the steps of cleaning the steel slag adsorption agent in a reactor by inert gas; after the heating, removing impurities; performing vacuum pumping; introducing mixed gas containing carbon dioxide into the reactor into the steel slag materials; adsorbing the carbon dioxide; exhausting the smoke gas subjected to carbon dioxide removal;then, lowering the pressure to the normal pressure; then, performing desorption on nitrogen gas through the steel slag material at the room temperature to obtain the removed gas subjected to carbon dioxide.

Description

technical field [0001] The invention relates to the fields of solid waste recycling and greenhouse gas emission reduction, in particular to a method for removing carbon dioxide in gas by adsorption of steel slag. Background technique [0002] Converter slag is a solid waste produced in the steelmaking process, and its content accounts for about 10% of steel production. With the increasing demand for steel, the output of converter slag also increases rapidly. The stacking of a large amount of steel slag not only occupies the few land resources around the steel plant, but also poses a certain threat to the surrounding ecological environment. Converter steel slag contains a lot of useful resources, so how to use steel slag as a potential resource to make full and reasonable use has become a topic of increasing concern. [0003] At the same time, with the acceleration of the global modernization process, CO2 gas emissions are showing an astonishing growth rate, and the ensuing...

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Problems solved by technology

[0004] Steel slag has a large surface area and a large number of micro- and mesopore structures. Under the microscope, steel slag presents a porous honeycomb structure and a multi-void structure, which has a certain adsorption effect, and it is an alkaline material, but the adsorption effect is not as good as that of activated carbon materials.

Activated carbon also has rich void structure and high specific surface area, and is a commonly used carbon dioxide adsorbent, but activated carbon has problems such as high cost, so the present invention combines the advantages and disadvantages of these two materials to produce a Steel slag material mixed with activated carbon

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