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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  • Abstract
  • Description
  • Claims
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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 a

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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Example Embodiment

[0043]Example 1

[0044]Using a hot-dip galvanizing slag from a galvanizing plant, the zinc content of the slag is 20.5%, and the SO2The content is 2000 mg / m3For industrial flue gas, use the following steps:

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

[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 a reduction reaction occurs at the cathode to be loaded on the cathode plate Above, the impurity removal of the zinc-ammonia co...

Example Embodiment

[0051]Example 2

[0052]Using zinc concentrate from a zinc power plant to roast smoke and dust, the smoke and dust contains 62% zinc, and the SO2The content is 3000 mg / m3For industrial flue gas, use the following steps:

[0053](1) Mix the zinc slag with ammonia water and ammonium persulfate evenly. The solid-liquid ratio of the zinc slag and the slurry is 1:5 to obtain the zinc-ammonia complex slurry, and then the solid-liquid separation, and the insoluble metal leaching residue is separated Recycling as raw material for metal smelting, obtaining a mixed solution of zinc-containing ammonia complex and soluble metal ions in liquid phase;

[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 a reduction reaction occurs at the cathode to load the On the cathode plate, the impurity removal of the z...

Example Embodiment

[0058]Example 3

[0059]Using zinc-containing blast furnace fume from a steel plant with a zinc content of 8%, the SO2The content is 2000 mg / m3For industrial flue gas, use the following steps:

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

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

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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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