Absorbent, i.e. activated carbon mixed with steel slag was prepared by mixing method for desulfurization and denitration of sintering flue gas. The samples of absorbent were characterized by XRF, BET, SEM and FT-IR. Experiments of desulfurization and denitration of simulated sintering flue gas were carried out in a programmable electrically heated fixed-bed reactor. The effects of reaction temperature, SO2 concentration, concentration ratio of [NH3]/[NO] and O2 content were considered. The results showed that the maximum desulfurization and denitration rates were 79% and 34%, respectively, under the conditions of contents of SO2 0.06vol%, NO 0.04vol%, O2 15vol% and at 120℃ of reaction temperature. When NH3 was introduced into the reactor with concentration ratio of [NH3]/[NO]=1, the desulfurization and denitration rates increased. When NH3 existed, activated carbon mixed with steel slag kept high desulfurization efficiency. The steel slag had a certain catalytic reduction effect. The denitration rate decreased with the increase of reaction temperature. The increase of O2 content can promote the absorption of NO and SO2 by activated carbon mixed with steel slag. Combined with characterization analysis, it was found that the specific surface area of the absorbent reduced by the mixing with steel slag. But activated carbon mixed with steel slag contained a certain amount of Fe2O3 which has a certain catalytic reduction effect and can increase the denitration efficiency. At the same time, the addition of steel slag can also utilize rationally solid waste so as to achieve the purpose of "treatment of pollutants with solid waste".
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