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Method for treating unsteady sulfur dioxide flue gas

A sulfur dioxide and treatment method technology, applied in chemical instruments and methods, separation methods, separation of dispersed particles, etc., can solve the problems of large energy, high processing cost, and consumption

Inactive Publication Date: 2012-06-20
LAIBIN CHINA TIN SMELTING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This method effectively solves the pollution problem of sulfur dioxide, does not produce secondary pollutants, and realizes turning waste into wealth. However, this method consumes a large amount of energy, making the treatment cost very high, and is not economically reasonable. Therefore, there is no Promoted and applied in industry

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  • Method for treating unsteady sulfur dioxide flue gas

Examples

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no. 1 example

[0014] The present embodiment is the first example of the treatment method of unsteady state sulfur dioxide flue gas described in the present invention, comprises the following steps:

[0015] Zinc oxide containing 45% zinc is slurried at a liquid-solid ratio of 5:1, and pumped into a three-stage turbulent ball absorption tower with a delivery rate of 30 cubic meters per hour to absorb unsteady sulfur dioxide fumes flowing through the tower The flow rate of flue gas into the tower is 15,000-30,000 cubic meters per hour, the concentration of sulfur dioxide in the flue gas is 0.35-2.35%, and the absorption temperature is normal temperature. The sulfur dioxide content of the flue gas after absorption is 360 mg / standard cubic meter. The zinc sulfite slurry generated after absorption is separated from solid and liquid by a filter press, and the filter press solution is returned to zinc oxide slurry. Leach 20 cubic meters of electrolytic waste liquid with 150 g / L of acid, the leachi...

no. 2 example

[0017] This embodiment is the second example of the method for treating unsteady sulfur dioxide flue gas of the present invention, comprising the steps of:

[0018] Zinc oxide containing 60% zinc is slurried according to the liquid-solid ratio of 8:1, and then pumped into the three-stage turbulent ball absorption tower with a delivery flow rate of 40 cubic meters per hour to absorb the unsteady state of the flow through the tower. Sulfur dioxide flue gas, the flow rate of the flue gas into the tower is 25,000-35,000 cubic meters per hour, the concentration of sulfur dioxide in the flue gas is 1.58-3.82%, the absorption is carried out at room temperature, and the sulfur dioxide content of the absorbed flue gas is 450 mg / standard cubic meter, which is directly discharged , the zinc sulfite slurry generated after absorption is separated from solid and liquid with a filter press, and the filter press solution is returned to zinc oxide slurry, and the filter press residue is 12 tons...

no. 3 example

[0020] The present embodiment is the third example of the treatment method of unsteady state sulfur dioxide flue gas described in the present invention, comprises the following steps:

[0021] Zinc oxide containing 80% zinc is slurried according to the liquid-solid ratio of 10:1, and then pumped into the three-stage turbulent ball absorption tower with a delivery flow rate of 50 cubic meters per hour to absorb the unsteady state of the flow through the tower. Sulfur dioxide flue gas, the flow rate of the flue gas into the tower is 20,000-50,000 cubic meters per hour, the concentration of sulfur dioxide in the flue gas is 1.08-5.82%, and the sulfur dioxide content of the absorbed flue gas is less than 652 mg / standard cubic meter, which is directly discharged and generated after absorption The zinc sulfite slurry is separated by a filter press, and the filter solution is returned to the zinc oxide slurry, and the filter residue is 15 tons, and it is leached with 16 cubic meters o...

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Abstract

The utility model relates to a method for treating unsteady sulfur dioxide flue gas, wherein zinc oxide is adopted for absorbing unsteady sulfur dioxide flue gas so as to produce zinc sulfite, the content of the sulfur dioxide in flue gas after absorption is lower than 850 mg per normal cubic metre, zinc sulfite is leached by dilute sulphuric acid so as to produce zinc sulfate and sulfur dioxide gas, the concentration of the leached sulfur dioxide gas is higher than 10 percent, and the sulfur dioxide gas with the concentration higher than 10 percent is used for preparing sulphuric acid. After the adoption of the method provided by the invention, sulfur dioxide pollutants in unsteady flue gas can be converted into sulfuric acid products, secondary pollutants can not be caused, and the enviroment can be effectively protected; and meanwhile, the method has the advantages as follows: the sources of zinc oxide absorbents are wide, power and energy consumed during the absorbing and leaching processes are less, and the production cost is low.

Description

technical field [0001] The invention relates to the field of non-ferrous metal smelting, in particular to a method for treating flue gas of unsteady sulfur dioxide. Background technique [0002] At present, lime absorption or sodium salt absorption are two main methods for unsteady sulfur dioxide flue gas treatment. [0003] The lime absorption method is to digest and slurry the lime to obtain a lime slurry, and then use the lime slurry to absorb the flue gas of unsteady sulfur dioxide, and generate calcium sulfite after absorption. Since the generated calcium sulfite and its oxidation product calcium sulfate have no industrial application value, they cannot be recovered in the form of products and can only be piled up, forming secondary pollution. The pollution source is transferred from the flue gas of unsteady sulfur dioxide to the calcium sulfite product, and the pollution has no be cured effectively. [0004] Sodium salt absorption method is to prepare alkaline sodium...

Claims

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Application Information

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IPC IPC(8): B01D53/78B01D53/50
Inventor 梁敏炎文丕忠廖春图陶政修蒋光佑廖柏俊
Owner LAIBIN CHINA TIN SMELTING
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