(昆明理工大学 环境科学与工程学院，昆明 650500)
摘 要: 以管式气氛炉作发生器，通过加热重金属氧化物，模拟冶炼厂重金属烟气。采用硫化铵沉淀化处理含铅、镉、汞的冶炼烟气，考察了硫化铵溶液的浓度、pH及SO2等条件对铝、镉、汞去除效果的影响。结果表明：硫化铵法吸收净化含铅、镉、汞烟气的最佳浓度分别为0.2、0.2和0.8 mol/L，最佳反应pH均为10。在最佳反应条件下，铅、镉、汞的净化效率可分别达到95.5%、93.2%、99.9%，烟气出口铅、镉、汞浓度均达到《大气污染物综合排放标准》(GB16297—1996)。此外，SO2对硫化铵吸收净化重金属有抑制作用。
关键字: 硫化铵；重金属；净化效率
（Faculty of Environmental Science and Engineering,
Kunming University of Science and Technology, Kunming 650500, China）
Abstract:Tubular resistance furnace was used as a reactor to simulate smelter flue gas of heavy metals by heating heavy metal oxides. And the flue gas containing Pb, Cd and Hg was treated with ammonium sulfide solution. The experiment was conducted to investigate the effects of (NH4)2S concentration, pH value of solution and the existence of SO2 on removal efficiency. The results show that the optimal concentration of Pb, Cd and Hg absorbed by ammonium sulfide solutions are 0.2, 0.2 and 0.8 mol/L, respectively. And the optimal pH value is 10. Under the optimum conditions, the removal efficiency of Pb, Cd and Hg reach 95.5%, 93.2% and 99.9%, respectively. The emission concentration of Pb, Cd and Hg reach the requirements of Air Pollutant Emission Standard (GB16297-1996). In addition, SO2 can reduce the removal efficiency of heavy metals of smelter flue gas.
Key words: ammonium sulfide; heavy metal; removal efficiency
