Method for preparing acid from high-concentration SO2 smelting flue gas

Abstract

The invention discloses a method for preparing acid from high-concentration SO2 smelting flue gas. The acid preparing method comprises the purification process, the dry suction process, the conversionprocess and the finished product obtaining process. In the metallurgical industry, most smelting raw materials are metal sulfide such as zinc sulfide and copper sulfide, a large amount of sulfur dioxide smoke is generated in the smelting process, and pollution to the environment is severe; when the concentration of SO2 in the flue gas reaches a certain degree, the method for preparing the acid from the smelting flue gas can be used, waste is changed into wealth, sulfuric acid is produced, and the purposes of pollutant emission reduction and comprehensive utilization of waste gas are also achieved. According to the method, the reversibility of a sulfur dioxide conversion reaction is utilized, before the high-concentration SO2 smelting flue gas enters a reactor, part of the flue gas is usedfor reacting with diluent air and pure oxygen to generate a small amount of sulfur trioxide, and the one-layer reaction temperature of a converter is inhibited. The pure oxygen is supplemented, so that the amount of the diluent air is reduced, the size of equipment is reduced, and the operating cost of an acid preparing device is reduced.

Description

technical field [0001] The present invention relates to the method for making acid, in particular to a kind of high-concentration SO 2 A method for producing acid from smelting flue gas. Background technique [0002] Smelting flue gas is the waste gas produced in the smelting process, and SO 2 There are a lot of sulfur resources in the form of sulfur. my country is a country deficient in sulfur resources and needs to import a large amount of sulfur every year to meet the needs of domestic sulfur industry production. Recovery of SO in smelting flue gas 2 The production of industrial sulfuric acid is currently the main way of recycling smelting flue gas. [0003] With the development of industrial oxygen production technology, oxygen-enriched smelting technology has been widely used, and has gradually become the main form of new smelting capacity, resulting in smelting flue gas SO 2 The concentration has been greatly increased, reaching 30%, or even higher. Smelting flue...

AI Technical Summary

Problems solved by technology

Smelting flue gas SO 2 The sharp increase in concentration brings great difficulties to the recovery of sulfur resources in smelting flue gas

If the traditional smelting flue gas acid production technology is used, a large amount of diluted air needs to be proportioned to meet the conversion reaction concentration (≤14%) requirements, which will increase the size of the acid production equipment, increase investment costs, and increase operating costs, resulting in economic benefits significant decline in