Desulfurizing agent for blast furnace gas and preparation method thereof

Abstract

The invention provides a desulfurizing agent for blast furnace gas and a preparation method thereof, belonging to the technical field of air pollution treatment. The desulfurizing agent comprises blast furnace slag, steel slag, red mud from a steel mill, red mud from an aluminum mill, an organic binder, a pore-forming agent, a peptizing agent and water. The method comprises the following steps: mixing the blast furnace slag or the steel slag with the red mud, the organic binder and the pore-forming agent, adding the peptizing agent and the water into the mixed materials, carrying out kneadingand molding, and finally drying and roasting the molded material to obtain the desulfurizing agent with calcium ferrite as an active component. According to the method, the desulfurizing agent which is low in price, high in sulfur capacity and high in desulfurizing precision is produced by utilizing solid wastes of iron and steel enterprises and adopting a simple preparation process, so the cost of dry desulfurization of blast furnace gas at present is reduced, and discharging problems of solid wastes in iron and steel enterprises are solved.

Description

technical field [0001] The invention relates to the technical field of air pollution control, in particular to a desulfurizer for blast furnace gas and a preparation method thereof. Background technique [0002] At present, the iron and steel industry has officially entered the era of "ultra-low emissions". Users such as blast furnace hot blast stoves, steel rolling heating furnaces, and gas power generation require the combustion of tail gas SO 2 Reach ultra-low emission limits, while the existing blast furnace gas purification process cannot meet SO 2 Control requirements. With the country's increasing emphasis on environmental protection, it is imminent to solve the problem of excessive sulfide content in blast furnace gas. [0003] The total sulfur content of blast furnace gas is 50-180mg / m 3 Among them, organic sulfur accounts for 75%, mainly COS. Blast furnace gas desulfurization often adopts carbonyl sulfide hydrolysis series dry desulfurization process. The comm...

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Problems solved by technology

However, the price of raw materials used in this method is relatively expensive, and the production cost of desulfurizer is high; and ferric nitrate will decompose and produce a large amount of nitrogen oxides during roasting, and the pressure of environmental protection is great.