Zinc oxide method treatment process for sulfur dioxide waste gas

Abstract

The invention discloses a zinc oxide method treatment process for sulfur dioxide waste gas, and belongs to the field of treatment of sulfur dioxide waste gas. The proposed scheme comprises the following steps: collecting crude zinc oxide, and collecting crude zinc oxide produced in a fuming furnace for lead smelting, performing alkali elution on the collected crude zinc oxide so as to remove fluorine and chlorine, arranging a pre-washing tower at the front end of an absorption tower so as to eliminate influences of organic matter and impurities in flue gas on production of a subsequent wet-method zinc-smelting system, performing high pressure air oxidation on a zinc sulfite mixed solution, inserting an aeration tube into the zinc sulfite mixed solution, blowing compressed air into the aeration tube with the blown air pressure of 0.03-0.08 Mpa, and oxidizing zinc sulfite so as to produce a zinc sulfate solution under a forced oxidation atmosphere. The desulfurization efficiency can reach 95% or above, the emission concentration of SO2 is kept stable at 100 mg / Nm<3> or below, and the operating cost of the system is low; and only the operating cost of devices is required, and no costof desulfurization agents is generated.

Description

Technical field [0001] The invention relates to the technical field of sulfur dioxide waste gas treatment, in particular to a zinc oxide method sulfur dioxide waste gas treatment process. Background technique [0002] The smelting of heavy metals such as lead, zinc and copper mainly uses sulfide ore as the main raw material, so the exhaust gas emitted during the smelting process is mainly sulfur dioxide flue gas. Steady progress has been made in the treatment of high-concentration sulfur dioxide flue gas, and the contact method is basically used to make acid. However, the environmental pollution problem of low-concentration sulfur dioxide flue gas produced in the smelting process is still very prominent. Low-concentration sulfur dioxide flue gas refers to flue gas whose concentration is below 3% (mostly 0.2-0.5%). Most of the low concentration SO 2 SO in flue gas 2 The concentration is mostly 0.1 to 0.5%. The low-concentration SO2 waste gas has the characteristics of wide dispe...

AI Technical Summary

Problems solved by technology

The disadvantages of this process are: the system is complex and occupies a large area; the cost is high and the one-time investment is large; the system is easy to cause fouling, blockage and wear during operation; the operation cost is high, and the electricity and water cycle caused by the high liquid / gas ratio And consumption is very large; not suitable for small and medium-scale flue gas desulfurization