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Method and system for removing sulfur dioxide in flue gas by coupling zinc-ammonia complexing with persulfate advanced oxidation technology

An advanced oxidation technology and persulfate technology are applied in the field of industrial solid waste resource utilization and flue gas desulfurization, which can solve problems such as low zinc leaching rate, limitation of desulfurization efficiency, and influence on the purity of zinc-containing products, and achieve a large metal recovery rate. , Improve the effect of leaching rate

Pending Publication Date: 2021-02-05
KUNMING UNIV OF SCI & TECH
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this process, because the zinc sulfide in the zinc-containing waste cannot be leached by ammonia water, the leaching rate of zinc is low, and some soluble metal ions still exist in the zinc-ammonia complex solution after ammonia leaching, which is difficult to obtain impact on the purity of zinc-containing products
In addition, due to the limited oxygen content in the flue gas during the desulfurization process, the desulfurization efficiency is limited

Method used

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  • Method and system for removing sulfur dioxide in flue gas by coupling zinc-ammonia complexing with persulfate advanced oxidation technology
  • Method and system for removing sulfur dioxide in flue gas by coupling zinc-ammonia complexing with persulfate advanced oxidation technology

Examples

Experimental program
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Effect test

Embodiment 1

[0044]Use hot-dip galvanizing slag from a galvanizing plant, the zinc content of which is 20.5%, to treat SO 2 The content is 2000 mg / m 3 industrial flue gas, the following steps are adopted:

[0045] (1) Mix the zinc dross with ammonia water and ammonium persulfate evenly, the solid-to-liquid ratio of the zinc dross and the slurry is 1:4, and obtain the zinc-ammonia complex slurry, and then separate the solid and liquid, and the insoluble metal leaching residue is separated Recycled as metal smelting raw materials, liquid phase to obtain a mixed solution containing zinc ammonia complex and soluble metal ions;

[0046] (2) The solution obtained in step (1) is passed into the anode chamber of the electrolytic cell, and iron, copper, and cobalt ions enter the cathode chamber through the cation exchange membrane under the action of an electric field, and the reduction reaction occurs at the cathode and is loaded on the cathode plate Above, the impurity removal of the zinc-ammon...

Embodiment 2

[0052] Use zinc concentrate roasting fume from a zinc power plant, the dust content of which is 62% zinc, to treat SO 2 The content is 3000 mg / m 3 industrial flue gas, the following steps are adopted:

[0053] (1) Mix the zinc dross with ammonia water and ammonium persulfate evenly, the solid-to-liquid ratio of the zinc dross and the slurry is 1:5, and obtain the zinc-ammonia complex slurry, and then separate the solid and liquid, and the insoluble metal leaching residue is separated Recycled as metal smelting raw materials, liquid phase to obtain a mixed solution containing zinc ammonia complex and soluble metal ions;

[0054] (2) The solution obtained in step (1) is passed into the anode chamber of the electrolytic cell, and iron, copper, manganese, and lead ions enter the cathode chamber through the cation exchange membrane under the action of an electric field, and the reduction reaction occurs at the cathode. On the cathode plate, the impurity removal of the zinc-ammoni...

Embodiment 3

[0059] Using zinc-containing blast furnace dust from a steel plant, the dust content of which is 8% zinc, to treat SO 2 The content is 2000 mg / m 3 industrial flue gas, the following steps are adopted:

[0060] (1) Mix the zinc dross with ammonia water and ammonium persulfate evenly, the solid-to-liquid ratio of the zinc dross and the slurry is 1:5, and obtain the zinc-ammonia complex slurry, and then separate the solid and liquid, and the insoluble metal leaching residue is separated Recycled as metal smelting raw materials, liquid phase to obtain a mixed solution containing zinc ammonia complex and soluble metal ions;

[0061] (2) The solution obtained in step (1) is passed into the anode chamber of the electrolytic cell, and the lead, copper, and iron ions enter the cathode chamber through the cation exchange membrane under the action of an electric field, and the reduction reaction occurs at the cathode and is loaded on the cathode plate Above, the impurity removal of the...

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Abstract

The invention discloses a method and system for removing sulfur dioxide in flue gas by coupling zinc-ammonia complexing with persulfate advanced oxidation technology. The method comprises the following steps of firstly, uniformly mixing zinc-containing waste with ammonia water and an ammonium persulfate solution, carrying out solid-liquid separation to obtain a zinc-ammonia complexing solution, then introducing the zinc-ammonia complexing solution into an electrolysis device to remove impurities and prepare a mixed solution containing ammonium persulfate, spraying the mixed solution into a flue gas desulfurization tower, activating the ammonium persulfate in waste heat provided by flue gas to generate SO4.-with a strong oxidizing property, and absorbing SO2 in the flue gas by the zinc-ammonia complexing solution under oxidation strengthening to achieve the purpose of efficient desulfurization of the flue gas; and introducing desulfurization slurry into an electrolytic cell again, carrying out cyclic electrolysis for multiple times to obtain pure nano-zinc, recycling an ammonium sulfate and ammonium persulfate mixed solution generated by electrolysis, and participating in the zinc-ammonia complexing reaction again. The method has the advantages of coupling of flue gas desulfurization and secondary zinc resource recovery processes, high flue gas desulfurization efficiency, high recovery rate of metal in waste, multi-path cyclic utilization of ammonium sulfate and the like.

Description

technical field [0001] The invention belongs to the technical field of resource utilization of industrial solid waste and flue gas desulfurization, and specifically relates to a method for removing sulfur dioxide in flue gas by zinc-ammonia complexation coupling persulfate advanced oxidation technology. Background technique [0002] Zinc is currently one of the metals with the highest recycling rate in the world. Secondary zinc resources, including soot, galvanizing residue, die-casting waste, and scrap zinc flakes, have become important raw materials for recycling zinc and other high-value elements, accounting for 30% of the world’s Zinc comes from secondary zinc resources, and the annual output value of secondary zinc is as high as 2.9 million tons. my country is a big country in zinc smelting, and its zinc output ranks first in the world. A large amount of zinc-containing waste residue is produced during the zinc smelting process. For example, traditional zinc smelting en...

Claims

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Application Information

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IPC IPC(8): C25C1/16C22B19/20C22B19/30C25B1/28B01D53/50B01D53/80
CPCC25C1/16C22B19/26C22B19/30B01D53/80B01D53/502B01D2258/0283Y02P10/20Y02P20/129
Inventor 宁平李晨赵群林琳田森林杨珊珊李波李英杰黄建洪胡学伟
Owner KUNMING UNIV OF SCI & TECH
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