Zinc oxide desulfuration technology

A desulfurization process and zinc oxide technology, applied in the direction of zinc sulfate, chemical instruments and methods, and separation of dispersed particles, can solve the problems of poor operating environment, large floor area, and low moisture content of filter residue, and achieve easy operation and maintenance. The effect of saving raw material cost and simple process
CN102423622AInactive Publication Date: 2012-04-25CHINA ENFI ENGINEERING CORPORATION
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Patent Information

Authority / Receiving Office
CN ยท China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA ENFI ENGINEERING CORPORATION
Publication Date
2012-04-25
Estimated Expiration
Not applicable ยท inactive patent

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Abstract

The invention discloses a zinc oxide desulfuration technology, which comprises the following steps of: reversely contacting sulfurous flue gas with a zinc-oxide-contained absorption solution in an absorption tower so as to remove sulfur from the sulfurous flue gas; conveying the desulfurated absorption solution into a settling tank and carrying out settling so as to obtain solid impurities and a supernatant; stirring and pulpifying the supernatant and a zinc-oxide-contained absorbent in a pulpifying tank, and then, conveying the mixture back the absorption tower; subjecting the solid impurities and a waste acidic solution to reacting in an acidifying tank so as to produce SO2 and acidified serous fluid; reversely contacting the acidified serous fluid with air in a sulfur dioxide desorption tower so as to desorb the SO2 from the acidified serous fluid and obtain SO2-desorbed serous fluid; and carrying out acid making by using the produced SO2. According to the zinc oxide desulfuration technology disclosed by the embodiment of the invention, the cost for raw materials in each system is saved, and no waste gas, waste liquid and waste solid are discharged in the whole system, so that the totally-closed operation is realized, and the requirements on environmental protection are met. In addition, the technology is simple, the process is short, further, the operation is convenient, and the continuous operation can be realized.
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Description

technical field

[0001] The invention relates to a zinc oxide desulfurization process. Background technique

[0002] The traditional zinc oxide desulfurization process is as follows: a slurry containing zinc oxide (ZnO) or pure ZnO mixed with water and sulfur dioxide (SO 2 ) flue gas contacts, reacts, and generates zinc sulfite (ZnSO 3 ), ZnSO 3 After the precipitate is filtered by the filter press, the formed filter residue is sent to the roasting workshop; there are also ZnSO 3 In the case of oxidizing air blowing, the oxidation reaction occurs, and ZnSO is finally generated 4 , containing ZnSO 4 , ZnSO 3 , ZnO and the mixed solution of impurities, after being filtered by a filter press, the filtrate contains a large amount of ZnSO 4 , is sent to the leaching section of the wet system. After the filter residue is dried, it is sent to the slag treatment system or roasting section of the zinc smelter.

[0003] The overall chemical reaction equation is as follows: [...

Claims

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