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Flue gas desulfurization process of zinc smelting system

A desulfurization process and zinc smelting technology, applied in the field of desulfurization process, 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 low chemical cost.

Inactive Publication Date: 2019-04-05
ZHUZHOU SMELTER GRP
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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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  • Flue gas desulfurization process of zinc smelting system

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Effect test

Embodiment 1

[0025] The invention relates to a flue gas desulfurization process of a zinc smelting system, which comprises a ZnO slurry manufacturing part, a primary desulfurization part, a secondary desulfurization part and a tertiary desulfurization part.

[0026] (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. 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 15 μm.

[0027] (2) Primary desulfurization part: The prepared ZnO slurry is sprayed into the primary absorption tower to react with sulfur dioxide in the washed flue gas of the zinc smelting system. The amount of flue gas introduced into the ...

Embodiment 2

[0030] The invention relates to a flue gas desulfurization process of a zinc smelting system, which comprises a ZnO slurry manufacturing part, a primary desulfurization part, a secondary desulfurization part and a tertiary desulfurization part.

[0031] (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. Or after multi-stage alkaline cleaning treatment, the fluorine content in the zinc scum 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 particle size of D90 10μm.

[0032] (2) Primary desulfuriza...

Embodiment 3

[0036] The invention relates to a flue gas desulfurization process of a zinc smelting system, which comprises a ZnO slurry manufacturing part, a primary desulfurization part, a secondary desulfurization part and a tertiary desulfurization part.

[0037] (1) ZnO slurry manufacturing part: the zinc scum after casting in the zinc smelting system is sorted into metal zinc blocks, sieved metal zinc particles, and then enters the ball milling process. The particle size D90 of the scum powder is 70 μm, and the zinc oxide content is 90.5%. , After the finely ground 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 pul...

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Abstract

The invention relates to a flue gas desulfurization process of a zinc smelting system. The flue gas desulfurization process includes separating metal zinc from zinc dross after ball-milling of the zinc dross, and subjecting dross powder to defluorination and dechlorination until the fluorine content and the chlorine content in the zinc dross are not more than 0.1% and 0.3% respectively; performingpulping by a pulping tank, and further grinding zinc oxide after a vertical milling process to form ZnO ore pulp; spraying the prepared ZnO ore pulp into an absorption tower for primary desulfurization, secondary desulfurization and tertiary desulfurization. The flue gas desulfurization process has the advantages of high desulfurization efficiency, less proneness to clogging of nozzles and pipelines, low medicament cost and high resistance to sulfur dioxide impact load.

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): B01D53/80B01D53/50B01D53/75C01B17/74
CPCB01D53/507B01D53/75B01D53/80C01B17/74B01D2258/025B01D2258/0283
Inventor 张天芳陈雪云夏海燕伏东才林文军罗羽裳杨凌云
Owner ZHUZHOU SMELTER GRP
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