| 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. |
