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

A technology for smelting flue gas and high concentration, which is applied in the field of acid production, can solve the problems of increased operating costs, increased size of acid production equipment, increased investment costs, etc., and can reduce operating costs, reduce dilution air volume, reduce The effect of device size

Inactive Publication Date: 2018-04-10
广西金川有色金属有限公司
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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

Method used

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Embodiment Construction

[0029] A high concentration of SO 2 A method of producing acid from smelting flue gas, high concentration SO 2 The method for making acid from smelting flue gas includes: purification process, dry absorption process, conversion process, and finished product process.

[0030] Preferably, the purification process includes:

[0031] high concentration SO 2 The flue gas enters the Venturi tube, contacts with the sprayed dilute sulfuric acid of about 15% for mass transfer, heat transfer and cooling to remove most of the mineral dust and other impurities, and then enters the foam tower to be sprayed with 2-3% dilute sulfuric acid for further removal. Mineral dust and other impurities are cooled to about 40°C by the intercooler, and the acid mist is removed by the electric demister to reduce the acid mist to 0.03g / Nm 3 Then enter the drying tower of the dry suction process;

[0032] The 15% dilute sulfuric acid discharged from the venturi tube is settled and separated from the mi...

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/74
CPCC01B17/74
Inventor 苟彦军杨德鑫张俊杰张涛
Owner 广西金川有色金属有限公司
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