Method for treating non-ferrous metal smelting smoke acid-making tail gas by low-temperature catalytic oxidation cooperated with ultraviolet light

Abstract

The invention discloses a method for treating non-ferrous metal smelting smoke acid-making tail gas by low-temperature catalytic oxidation cooperated with ultraviolet light, and belongs to the technical field of environment. The method for treating the non-ferrous metal smelting smoke acid-making tail gas by the low-temperature catalytic oxidation cooperated with the ultraviolet light comprises the steps that an ultraviolet lamp is used for shining the tail gas, so that oxygen molecules in oxygen in the tail gas generates ionization, recombination is carried out to generate strong oxidant ozone, and the volume percent of O<2> is 2-6% of tail gas total quantity; the tail gas is oxidized through a solid phase catalytic oxidizing agent bed layer after shined by the ultraviolet lamp, and simultaneous desorption of SO<2>, NO<x> and Hg<0> in the acid-making tail gas is realized; the reaction temperature in a catalytic bed is 50-250 DEG C; and a solid catalyst in the solid phase catalytic oxidation process takes aluminum oxide as a carrier, and active components are one or multiple any combination of manganese, molybdenum, cobalt, cerium, iron and copper. According to the method for treating the non-ferrous metal smelting smoke acid-making tail gas by the low-temperature catalytic oxidation cooperated with the ultraviolet light, the removal efficiency of SO<2>, NO<x> and Hg<0> in theacid-making tail gas can reach more than 85%, and cooperative and efficient purification of SO<2>, NO<x> and Hg<0> in a same system in the low-temperature condition is realized.

Description

technical field [0001] The invention relates to a method for treating non-ferrous metal smelting flue gas acid production tail gas by ultraviolet light synergistic low-temperature catalytic oxidation, which belongs to the field of environmental technology. Background technique [0002] Non-ferrous metal smelting mostly uses sulfide concentrates as raw materials, and is a pyrometallurgy process under high temperature and high oxygen conditions, so high concentrations of sulfur dioxide (SO 2 ), and its concentration can be as high as 7%~13%. For most non-ferrous metal smelters, the contact method is usually used to convert high-concentration SO 2 Converted to sulfuric acid, the process is now mature. However, there is still a small amount of SO in the tail gas after acid production 2 , while nitrogen oxides (NO x ) may exist in the flue gas at the outlet of the smelting furnace. During the subsequent acid production process, part of it will enter the finished acid to form n...

AI Technical Summary

Problems solved by technology

However, most of the current methods use independent solutions to combine SO 2 , NO x and Hg 0 It is efficiently removed in their respective treatment systems, but this brings an obvious disadvantage that each system is independent of each other, the whole process is complicated, the floor area is large, and the one-time investment and operation costs are high, which brings great harm to the non-ferrous metal smelting industry. great economic pressure