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Flue gas desulfurization system for zinc smelting process

A desulfurization system and zinc smelting technology, applied in the field of desulfurization technology, can solve the problems of inability to ensure the discharge of high-concentration sulfur dioxide-containing flue gas up to the standard, pipeline blockage, etc., and achieve good environmental protection benefits, not easy to block, and high efficiency.

Inactive Publication Date: 2019-07-02
ZHUZHOU SMELTER GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its main purpose is to solve the problem of pipe blockage in the current technology and the inability to ensure the discharge of high-concentration sulfur dioxide-containing flue gas up to the standard

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0020] Example 1, the present invention relates to a flue gas desulfurization process for a zinc smelting system, including a ZnO slurry manufacturing part, a primary desulfurization part, a secondary desulfurization part, and a tertiary desulfurization part.

[0021] (1) The manufacturing part of ZnO pulp includes: after casting the zinc scum after sorting the metal zinc block, sieving the metal zinc particles, and then entering the ball milling process, the particle size of the scum powder is D90 75μ, and the finely ground scum powder After hearth furnace treatment, the fluorine content in the zinc dross is 0.07%, the chlorine content is 0.2%, and the zinc oxide content is 95.5%. The scum powder after the above-mentioned treatment enters the pulping tank, adds water for pulping, and the ZnO concentration after pulping reaches 12%. D90 15μ.

[0022] (2) Primary desulfurization part: The prepared ZnO slurry is sprayed into the primary absorption tower to react with sulfur dio...

example 2

[0024] Example 2. The invention relates to a flue gas desulfurization process for a zinc smelting system, which includes a ZnO slurry manufacturing part, a primary desulfurization part, a secondary desulfurization part and a tertiary desulfurization part.

[0025] (1) The manufacturing part of ZnO pulp includes: after casting the zinc scum after sorting the metal zinc block and sieving the metal zinc particles, it enters the ball milling process, and the scum powder particle size is D90 70μ. After the multi-stage alkaline cleaning treatment, the fluorine content in the zinc dross is 0.1%, the chlorine content is 0.3%, and the zinc oxide content is 90.5%. After the above treatment, the scum powder enters the pulping tank, adds water and the slurry returned from the aeration tank for pulping, and the concentration of ZnO after pulping reaches 10%, and then enters the vertical mill process for further grinding after pulping in the pulping tank Zinc oxide forms ZnO slurry with a ...

example 3

[0029] Example 3, the present invention relates to a flue gas desulfurization process for a zinc smelting system, including a ZnO slurry manufacturing part, a primary desulfurization part, a secondary desulfurization part, and a tertiary desulfurization part.

[0030] (1) The manufacturing part of ZnO pulp includes: the zinc scum after casting is sorted into metal zinc blocks, sieved metal zinc particles, and then enters the ball milling process. After the fine scum powder is treated with one or more stages of alkali washing, the fluorine content in the zinc scum is 0.05%, and the chlorine content is 0.25%. After the above treatment, the scum powder enters the pulping tank, adds water and the slurry returned from the aeration tank for pulping, and the ZnO concentration after pulping reaches 15%, and then enters the vertical mill process for further grinding after pulping in the pulping tank Zinc oxide forms ZnO slurry with a particle size of D90 10μ.

[0031] (2) Primary desu...

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Abstract

The invention relates to a flue gas desulfurization system for a zinc smelting process. The system comprises a zinc oxide ore pulp manufacturing part, a primary desulfurization part, a secondary desulfurization part and a tertiary desulfurization part. The zinc oxide ore pulp manufacturing part: zinc scum after casting is subjected to ball milling, the metal zinc in the zinc scum is separated, thezinc scum is subjected to a fluorine and chlorine removal process until the fluorine content is not more than 0.1% and the chlorine content is not more than 0.3% in the zinc scum, slurrying is performed in a slurry tank, and then zinc oxide is further refined through a vertical grinding process to form a zinc oxide ore pulp. The primary desulfurization part: the prepared zinc oxide ore pulp is sprayed into a primary absorption tower and reacts with sulfur dioxide in the washed flue gas of the zinc smelting system, the formed zinc sulfite pulp liquid after reaction is concentrated, the supernatant is discharged into an aerated oxidation tank, the bottom flow is subjected to filtration and the filtrate is discharged into the aerated oxidation tank, the solution after oxidation by the aerated oxidation tank is returned to the slurry tank of the zinc oxide ore pulp manufacturing part for cyclic utilization, when the concentration of zinc ion in the solution reaches to be 150 g / L, the solution is fed to a zinc purification system for further treatment, and the filter residue is sent to a zinc sulfite material bin and is subjected to the comprehensive recovery of zinc after the collocation treatment with other zinc-containing materials. The process does not produce harmful waste gas, waste residue and waste water.

Description

technical field [0001] The invention relates to a desulfurization process for flue gas containing sulfur dioxide in a zinc smelting system, and belongs to the technical field of flue gas desulfurization in a zinc smelting system. Background technique [0002] At present, the commonly used desulfurization methods mainly include: lime method, sodium calcium double alkali method, soda ash method, ammonia soda method, magnesium oxide method, zinc oxide method, hydrogen peroxide method, etc., each method has corresponding advantages and disadvantages. [0003] Lime method and sodium-calcium double-alkali method generate waste during the desulfurization process, causing secondary pollution and low desulfurization efficiency; soda ash method, ammonia-soda method, magnesium oxide method, and hydrogen peroxide method all have problems such as high cost. [0004] The advantages of the zinc oxide method are low operating costs, no waste, and no secondary pollution. It has been widely u...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/50B01D53/78
CPCB01D53/502B01D53/78
Inventor 王文军刘敏张天芳
Owner ZHUZHOU SMELTER GRP
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