A set of simulation equipment is set up after the conditions of removing SO 2 and heavy metal Hg (Hg 0 and Hg 2+ ) has been investigated, the results of the removal technology method of absorption Hg 0 , Hg 2+ in smelting gases containing SO 2 with (NH 4 ) 2 S is tested, and their composition of reaction products and sediment are analyzed with XRD and XPS. Obtained that: when absorption concentration of (NH 4 ) 2 S are 0.8 mol/L, in pH 7.0-3.0 removal efficiency of Hg 0 and SO 2 is higher,

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... O 2 is higher, temperature will affect the absorption of Hg 0 , when reaction temperature is 30˚C the absorption of Hg 0 can be achieved the best. Under these optimum conditions, the removal efficiency of Hg 0, Hg 2+ and SO 2 could reach 89.45%, 99.42% and over 99.99%, the participation of SO 2 has a promote consequence on removal of Hg 0 . The main reaction product is HgS, HgSO 4 , (NH 4 ) 2 S 2 O 3 .