(昆明理工大學(xué) 環(huán)境科學(xué)與工程學(xué)院，昆明 650500)
摘 要: 以管式氣氛爐作發(fā)生器，通過加熱重金屬氧化物，模擬冶煉廠重金屬煙氣。采用硫化銨沉淀化處理含鉛、鎘、汞的冶煉煙氣，考察了硫化銨溶液的濃度、pH及SO2等條件對鋁、鎘、汞去除效果的影響。結(jié)果表明：硫化銨法吸收凈化含鉛、鎘、汞煙氣的最佳濃度分別為0.2、0.2和0.8 mol/L，最佳反應(yīng)pH均為10。在最佳反應(yīng)條件下，鉛、鎘、汞的凈化效率可分別達到95.5%、93.2%、99.9%，煙氣出口鉛、鎘、汞濃度均達到《大氣污染物綜合排放標(biāo)準(zhǔn)》(GB16297—1996)。此外，SO2對硫化銨吸收凈化重金屬有抑制作用。
關(guān)鍵字: 硫化銨；重金屬；凈化效率
（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
