Method for removing sulfur dioxide from flue gas

A technology of sulfur dioxide and manganese dioxide, which is applied in the direction of chemical instruments and methods, separation methods, and dispersed particle separation, can solve the problems of secondary pollution of the environment and a large amount of waste residue, and achieve no secondary pollution, good effect and fast speed Effect

Inactive Publication Date: 2006-12-27
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the common lime-limestone method and the limestone-g

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] Add 5 tons of water to 1 ton of chemical manganese dioxide and mix it into a slurry. At a temperature of 90°C, the slurry is fully contacted with flue gas containing sulfur dioxide, and the tetravalent manganese in the manganese dioxide is reduced to divalent manganese, and the flue gas Sulfur dioxide is oxidized to sulfur trioxide to produce manganese sulfate. The concentration of sulfur dioxide in the flue gas is reduced to 10mg / m 3 the following. The generated manganese sulfate solution is used to produce crystalline manganese sulfate, manganese carbonate, electrolytic manganese metal, etc.

Embodiment 2

[0011] Add 10 tons of water to 1 ton of electrolytic manganese dioxide and mix it into a slurry. At a temperature of 60°C, the slurry is in full contact with the flue gas containing sulfur dioxide, and the tetravalent manganese in the manganese dioxide is reduced to divalent manganese, and the flue gas Sulfur dioxide is oxidized to sulfur trioxide to produce manganese sulfate. The concentration of sulfur dioxide in the flue gas is reduced to 10mg / m 3 the following. The generated manganese sulfate solution is used to produce crystalline manganese sulfate, manganese carbonate, electrolytic manganese metal, etc.

Embodiment 3

[0013] Add 35 tons of water to 1 ton of chemical manganese dioxide and mix it into a slurry. At a temperature of 40°C, the slurry is in full contact with the flue gas containing sulfur dioxide, and the tetravalent manganese in the manganese dioxide is reduced to divalent manganese, and the flue gas Sulfur dioxide is oxidized to sulfur trioxide to produce manganese sulfate. The concentration of sulfur dioxide in the flue gas is reduced to 10mg / m 3 the following. The generated manganese sulfate solution is used to produce crystalline manganese sulfate, manganese carbonate, electrolytic manganese metal, etc.

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Abstract

The invention relates to a process for removing sulfur dioxide in flue gas, which belongs to the field of environmental protection, characterized by mixing manganese dioxide and sulfur dioxide-containing flue gas to give sulfur trioxide and manganese sulfate at the temperature of 1 to 1300 DEG C in a solid-liquid ratio of 1:(0-40), wherein manganese dioxide is used as oxidant, and further processing the manganese sulfate solution to produce crystalline manganese sulfate, manganese carbide, or electrolytic manganese metal. In the present invention, the product is provided with quick absorption rate and of sulfur dioxide and low cost.

Description

technical field [0001] The invention belongs to the field of environmental protection, in particular to a method for removing sulfur dioxide from flue gas. Background technique [0002] Our country is a country that consumes a lot of resources, while consuming, it produces serious environmental problems. According to the statistics of the national environmental protection department, the sulfur dioxide emitted by coal and oil combustion, metallurgical ore sintering, and non-ferrous metal smelting is as high as 20 million tons every year, so the annual economic loss is 15 billion. [0003] Flue gas desulfurization methods include double alkali method, lime-limestone method, limestone-gypsum method, ammonia method, lemon absorption method, spray drying method, activated carbon absorption method, etc. Among them, the lime-limestone method and the limestone-gypsum method are the most widely used because of the easy availability of raw materials and low cost. However, this metho...

Claims

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Application Information

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IPC IPC(8): B01D53/50
Inventor 邹兴
Owner UNIV OF SCI & TECH BEIJING
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