典型钢铁企业汞排放水平及排放特征研究

以某典型钢铁企业为研究对象,测定企业废气、废水、固废汞排放水平,并分析汞排放特征。研究表明,球团、烧结、高炉工艺废气排口烟尘中汞排放浓度和排放速率明显低于烟气;汞主要以气态形式排放,烧结工艺排口废气汞最高浓度分别是其他2个排口的7倍和3倍。球团、烧结、高炉、电炉四工艺环节中,烧结汞排放速率占四工艺汞排放速率总和的87%。半干法脱硫、氨法脱硫、石灰石石膏脱硫对废气中汞的去除效率分别为90.0%、78.7%和29.9%。企业废水排放未检出汞,脱硫产生固废汞含量明显高于除尘产生固废汞含量,脱硫灰汞含量是脱硫石膏的15倍。

Mercury Emission Level and Characteristics of Typical Iron and Steel Enterprise

Taking typical iron and steel enterprise as the research object, this work has determined the mercury emission level of waste gas, wastewater and solid waste, mercury emission characteristics has been analyzed as well. The result showed that in the process of pelletizing, sinter and blast furnace, mercury emission concentration and mercury emission rate were lower in the exhaust gas than that in the soot. Mercury emits mainly in the form of gas. The highest concentration of mercury in the exhaust gas of sinter was 7 times and 3 times higher than that of the other 2 emission ports. In the 4 process of pellets, sintering, blast furnace and electric furnace, the proportion of the total mercury emission rate in sinter was the largest, accounting for 87% of the total mercury emission rate of the 4 process. The removal efficiency of mercury in flue gas by semi dry desulfurization, ammonia desulphurization, limestone gypsum desulfurization was 90%, 78.7% and 29.9%, respectively. No mercury was detected in waste water discharged by the enterprise. The mercury content of solid waste produced by desulfurization was significantly higher than that produced by dust precipitation. The mercury content in desulfurization soot was 15 times of that in desulfurization limestone gypsum.