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A mixed desulfurizer prepared by using red mud and seawater and its flue gas desulfurization method

A desulfurization agent and seawater technology, applied in chemical instruments and methods, separation methods, gas treatment, etc., can solve pollution and other problems

Active Publication Date: 2020-12-11
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to address the shortcomings of the above-mentioned prior art, to provide a method that can effectively save desulfurization costs, reduce the environmental hazards caused by red mud, and solve the problem of SO in coal-fired enterprises in coastal areas. 2 Pollution problem, simple process, low cost, no secondary pollution, high desulfurization efficiency using mixed desulfurizer prepared from red mud and seawater and its flue gas desulfurization method

Method used

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  • A mixed desulfurizer prepared by using red mud and seawater and its flue gas desulfurization method
  • A mixed desulfurizer prepared by using red mud and seawater and its flue gas desulfurization method
  • A mixed desulfurizer prepared by using red mud and seawater and its flue gas desulfurization method

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Experimental program
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Effect test

Embodiment 1

[0026] Red mud and seawater are added to the pulping tank at a mass fraction of red mud (dry basis) of 1.0% to prepare seawater red mud slurry; then transported to the circulation tank, pumped to the desulfurization tower through the desulfurization cycle, and countercurrent contact reaction with the flue gas entering the tower , into the tower flue gas SO 2 The concentration is 500mg / Nm 3 , keep the desulfurization liquid-gas ratio at 6.5L / m 3 , the tower flue gas SO 2 The concentration is 3mg / Nm 3 About; the pH of the seawater red mud slurry in the circulation tank drops to 6.0, discharge 50% of the volume of seawater red mud slurry from the circulation tank, and then replenish the same volume of seawater red mud slurry, the pH of the seawater red mud slurry in the circulation tank rises to 8.10, and continue to desulfurize; The seawater red mud slurry is oxidized in the oxidation tank; after oxidation, it is concentrated in a concentrated sedimentation tank, and the conc...

Embodiment 2

[0029] Red mud and seawater are added to the pulping tank at a mass fraction of red mud (dry basis) of 8% to prepare seawater red mud slurry; then transported to the circulation tank, pumped to the desulfurization tower through the desulfurization cycle, and countercurrent contact reaction with the flue gas entering the tower , into the tower flue gas SO 2 The concentration is 10000mg / Nm 3 , keep the desulfurization liquid-gas ratio at 10.0L / m 3 , the tower flue gas SO 2 The concentration is 22mg / Nm 3 About; the pH of the seawater red mud slurry in the circulation tank drops to 6.0, and 30% of the volume of seawater red mud slurry is discharged from the circulation tank, and then an equal volume of seawater red mud slurry is added, and the pH of the seawater red mud slurry in the circulation tank rises to 8.85, and desulfurization continues; the discharged seawater The red mud slurry is oxidized in the oxidation tank; after oxidation, it is concentrated in a concentrated se...

Embodiment 3

[0032]Red mud and seawater are added to the pulping tank at a mass fraction of red mud (dry basis) of 15% to prepare seawater red mud slurry; then transported to the circulation tank, pumped to the desulfurization tower through the desulfurization cycle, and countercurrent contact reaction with the flue gas entering the tower , into the tower flue gas SO 2 The concentration is 5800mg / Nm 3 , keep the desulfurization liquid-gas ratio at 18.0L / m 3 , the tower flue gas SO 2 The concentration is 5mg / Nm 3 About; the pH of the seawater red mud slurry in the circulation tank drops to 6.0, and 20% of the volume of seawater red mud slurry is discharged from the circulation tank, and then an equal volume of seawater red mud slurry is added, and the pH of the seawater red mud slurry in the circulation tank rises to 8.62, and desulfurization continues; the discharged seawater The red mud slurry enters the oxidation tank for oxidation; after oxidation, it is concentrated in a concentrati...

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Abstract

The invention relates to a mixed desulfurizing agent prepared from red mud and seawater and a flue gas desulfurization method with the mixed desulfurizing agent. The invention is characterized in thatthe mixed desulfurizing agent is seawater red mud slurry formed by mixing red mud generated in an alumina production process with seawater; and the mass percentage of a red mud dry base in the seawater red mud slurry is 1-20%. In a flue gas desulfurization process, the seawater red mud slurry is contacted with the flue gas entering the tower in a countercurrent manner for circulating desulfurization, the desulfurized flue gas can meet a requirement of ultra-low emission, and the discharged invalid slurry is oxidized in an oxidation tank; liquid-solid separation is carried on the oxidized slurry, the separated desulfurized seawater and fresh seawater are mixed in a buffer tank, and a standard requirement of discharged seawater is met after mixing; and the dehydrated desulfurized red mud issent to a red mud storage yard or used for preparing building materials. The method provided by the invention has the advantages of simple process, low cost, no secondary pollution, and high desulfurization efficiency, not only solves the problem of SO2 pollution of coal-fired enterprises in coastal areas, but also can save the desulfurization cost for the coal-fired enterprises, and simultaneously reduces environmental hazards caused by red mud.

Description

technical field [0001] The invention relates to a mixed desulfurizing agent prepared by using red mud and seawater and a method for desulfurizing flue gas thereof. Background technique [0002] SO 2 It is the main pollutant in the atmosphere. With the strict control of air pollution in the country, SO 2 The emission concentration requirements are becoming more and more stringent. Currently governing SO in the world 2 The main technical means of pollution is flue gas desulfurization. There are more than 200 kinds of flue gas desulfurization technologies researched, developed and used in various countries, of which about 20 kinds have been industrialized, and wet desulfurization is the main method. Absorbent absorbs sulfur dioxide in flue gas, such as lime / limestone / gypsum method, ammonia method, etc. [0003] Red mud is the industrial solid waste produced by refining alumina from bauxite. For every ton of alumina produced, 1.0-1.8 tons of red mud will be produced. Red mu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/50B01D53/80
CPCB01D53/502B01D53/80B01D2258/0283
Inventor 刘中凯刘万超闫琨李学鹏练以诚李帅苏钟杨和新忠曹瑞雪张朝普雷树喜孙凤娟胡秋云
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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