Abstract:This paper mainly introduces the treatment of flue gas from the production of gold, silver, selenium, tellurium, lead and bismuth in Kaldo converter and top-blown rotary converter by ozonization and liquid alkali denitration technology in the face of the increasing requirements of environmental protection and the decrease of exhaust gas emission index. Thus, the sulfur dioxide index is less than 50mg/m3, nitrogen oxides is less than 60mg/m3, dust index is less than 10mg/m3, meeting the environmental protection requirements of Class A enterprises, and other heavy metal indexes meet the national control index requirements, which achieves ultra-low emission requirements.