Metallurgical solid waste based pressed active carbon for desulfurization and denitrification of flue gas and preparation method of pressed active carbon

Abstract

The invention discloses a metallurgical solid waste based pressed active carbon for desulfurization and denitrification of flue gas, the pressed active carbon comprises the following various components by mass percent: 65-80% of powdered activated carbon and 20-35% of forming agent, wherein the forming agent is compounded from a steel slag, a mineral waste residue and desulfurized fly ash. A gelatinizer prepared on the basis of the metallurgical waste residues like the steel slag is used to form and adsorb saturated granular active carbon or powdered activated carbon, the steel slag, the mineral waste residue and the desulfurized fly ash are compounded, the combining property of the forming agent and the powdered activated carbon is good, the mechanical property, the desulfurization and denitrification performances and the like of the obtained activated carbon are effectively improved, the problems like low specific surface of the inorganic forming activated carbon is effectively solved, meanwhile, the additional value of the comprehensive utilization of the metallurgical waste residue is improved, and the activated carbon has important economic and environmental benefits.

Description

technical field [0001] The invention belongs to the technical field of flue gas pollutant emission control, and in particular relates to a shaped activated carbon for flue gas desulfurization and denitrification based on metallurgical solid waste and a preparation method thereof. Background technique [0002] The sintering process is a major pollutant emitter in steel production, and it emits SO, which accounts for 70% of the waste gas emissions in steel production. 2 , 50% NOx. Control SO 2 Emission technologies mainly include limestone-gypsum method, ammonia method, rotary spray method, circulating fluidized bed method, double alkali method, etc.; technologies for controlling NOx emissions mainly include selective catalytic reduction method, selective non-catalytic reduction method, oxidation absorption law etc. Using the above control technology to control SO in flue gas 2 , NOx removal, desulfurization equipment and denitrification equipment need to be connected in s...

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Problems solved by technology

At present, for small particle activated carbon, it is generally used for boiler combustion, blast furnace combustion, etc., but the added value of activated carbon after combustion is low, and it will release a variety of pollutants

[0005] The activated carbon used for sintering flue gas desulfurization and denitrification is formed activated carbon. The forming agent includes organic and inorganic forming agents. The organic forming agent has a good affinity with activated carbon and can prepare activated carbon with a high specific surface area, but its mechanical strength is poor; Inorganic forming agent is easier to produce high-strength activated carbon, but the prepared activated carbon has a low specific surface area, and there are problems such as low desulfurization and denitrification efficiency when used in desulfurization and denitrification systems

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