中文摘要：

采用（NH4）2S溶液吸收净化高浓度SO2烟气，得到（NH4）2S2O3和NH4HSO3的混合溶液并转移至高压反应釜中,控制反应条件，两种物质发生自氧化还原反应，生成硫磺和（NH4）2SO4。实验考察了吸收SO2过程和自氧化还原过程的影响条件，结果表明：在pH=3～7，SO2气体流速300 ml·min^-1，（NH4）2S浓度为0.2～1.2 mol·L^-1，常温条件下，烟气中二氧化硫的吸收率达到99.8%以上，且无H2S生成；在pH=2.5～3.0，温度为130℃条件下，反应进行1 h，硫磺收率达到95%以上，溶液经过蒸发结晶得到（NH4）2SO4。用X射线衍射（XRD）和X射线荧光光谱（XRF）对硫磺和硫酸铵进行表征分析，结果表明：硫磺的纯度为99.14%，硫酸铵中氮元素含量为23.6%。

英文摘要：

SO2 in simulated smelting gas was absorbed by （NH4）2S solution, to obtain a mixed solution of （NH4）2S2O3 and NH4HSO3. After that the mixed solution was transferred into a special high pressure reaction kettle, and sulfur and ammonium sulfate were generated through the REDOX reaction under controlled conditions. The influence of SO2 absorption process condition and REDOX process condition were investigated. Under the condition of pH=3-7, SO2flow velocity of 300 ml·min^-1, normal temperature, （NH4）2S solution concentration of 0.2-1.2 mol·L^-1, absorption efficiency of SO2 reached more than 99.8% and H2S was not produced. Under the condition of pH=2.5-3.0, reaction temperature 130℃, sulfur recovery rate could reach more than 95% after one hour of reaction. Ammonium sulfate could be obtained through evaporation crystallization. Sulfur and ammonium sulfate generated during reaction were characterized by X-ray diffraction （XRD） and X-ray fluorescence （XRF）. Purity of sulfur was 99.14% and percentage of nitrogen in ammoniumsulfate was 23.6%.