for 48 h resulting in the activated catalyst which can be used again 1 the activated carbon is impregnated with a 0 2 mass copper acetate solution for 21 h then aged for 24 h calcinated at 650 u00b0 c for 12 h and finally dried at 110 u00b0 c for 7 h to obtain the catalyst of high efficiency 2 the tail gases from an ore smelting electrical furnace are washed with aqueous alkali solution and then the washed tail gases are preheated to 110 u00b0 c 3 after the volume content of the oxygen in the tail gases from step 2 is adjusted to 1 2 the tail gases pass through a catalytic oxidization fixed bed from the bottom to the top with a flow rate of 600 m 3 volume of gas m 3 volume of catalyst u00b7 for the purification reaction and the fixed bed is loaded with the catalyst of high efficiency obtained from step 1 the reaction temperature is 100 u00b0 c then the purified tail gases are cooled to obtain the feed gases for c1 chemistry the content of the typical impurity such as phosphorus sulfur and fluorine in the purified tail gases are less than 1 mg m.