CN112827342A - Red mud treatment method based on flue gas desulfurization - Google Patents
Red mud treatment method based on flue gas desulfurization Download PDFInfo
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- CN112827342A CN112827342A CN202011613830.3A CN202011613830A CN112827342A CN 112827342 A CN112827342 A CN 112827342A CN 202011613830 A CN202011613830 A CN 202011613830A CN 112827342 A CN112827342 A CN 112827342A
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 96
- 239000003546 flue gas Substances 0.000 title claims abstract description 96
- 238000006477 desulfuration reaction Methods 0.000 title claims abstract description 74
- 230000023556 desulfurization Effects 0.000 title claims abstract description 74
- 238000000034 method Methods 0.000 title claims abstract description 40
- 230000003009 desulfurizing effect Effects 0.000 claims abstract description 49
- 239000002002 slurry Substances 0.000 claims abstract description 47
- RAHZWNYVWXNFOC-UHFFFAOYSA-N Sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000000126 substance Substances 0.000 claims abstract description 8
- 239000007921 spray Substances 0.000 claims description 12
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 6
- 238000010521 absorption reaction Methods 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- 239000002699 waste material Substances 0.000 abstract description 8
- 230000002745 absorbent Effects 0.000 abstract description 4
- 239000002250 absorbent Substances 0.000 abstract description 4
- 238000006243 chemical reaction Methods 0.000 description 8
- 239000000292 calcium oxide Substances 0.000 description 4
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 4
- KKCBUQHMOMHUOY-UHFFFAOYSA-N sodium oxide Chemical compound [O-2].[Na+].[Na+] KKCBUQHMOMHUOY-UHFFFAOYSA-N 0.000 description 4
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 2
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 230000002378 acidificating effect Effects 0.000 description 2
- 239000003513 alkali Substances 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 239000006028 limestone Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 238000005507 spraying Methods 0.000 description 2
- 230000001502 supplementing effect Effects 0.000 description 2
- 238000005406 washing Methods 0.000 description 2
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- LSNNMFCWUKXFEE-UHFFFAOYSA-N Sulfurous acid Chemical compound OS(O)=O LSNNMFCWUKXFEE-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 239000001110 calcium chloride Substances 0.000 description 1
- 229910001628 calcium chloride Inorganic materials 0.000 description 1
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 1
- 229910001634 calcium fluoride Inorganic materials 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 229910052602 gypsum Inorganic materials 0.000 description 1
- XLYOFNOQVPJJNP-ZSJDYOACSA-N heavy water Substances [2H]O[2H] XLYOFNOQVPJJNP-ZSJDYOACSA-N 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 235000012239 silicon dioxide Nutrition 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 229910001948 sodium oxide Inorganic materials 0.000 description 1
- GEHJYWRUCIMESM-UHFFFAOYSA-L sodium sulfite Chemical compound [Na+].[Na+].[O-]S([O-])=O GEHJYWRUCIMESM-UHFFFAOYSA-L 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 230000002087 whitening effect Effects 0.000 description 1
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/77—Liquid phase processes
- B01D53/78—Liquid phase processes with gas-liquid contact
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/501—Sulfur oxides by treating the gases with a solution or a suspension of an alkali or earth-alkali or ammonium compound
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/68—Halogens or halogen compounds
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention relates to the technical field of red mud treatment and boiler flue gas desulfurization, in particular to a red mud treatment method based on flue gas desulfurization. The method is carried out in a tower body formed by connecting a dealkalizing tower and a desulfurizing tower in series: in the dealkalization tower, boiler flue gas contacts the red mud slurry entering the dealkalization tower from the desulfurization tower, alkaline substances in the red mud slurry are removed, and the obtained dealkalized red mud slurry is discharged out of the dealkalization tower; meanwhile, the temperature of the boiler flue gas is reduced, and the boiler flue gas enters a desulfurizing tower from a dealkalizing tower; in the desulfurizing tower, boiler flue gas entering the desulfurizing tower from the dealkalizing tower contacts with red mud slurry in the desulfurizing tower, sulfur dioxide in the boiler flue gas is removed, and clean flue gas is discharged out of the desulfurizing tower; meanwhile, the pH value of the red mud slurry is reduced and enters the dealkalization tower from the desulfurization tower. The method combines flue gas desulfurization and red mud dealkalization, treats waste by waste, solves the problem of the source of the absorbent for flue gas desulfurization, and solves the problem of red mud dealkalization according to local conditions.
Description
Technical Field
The invention relates to the technical field of red mud treatment and boiler flue gas desulfurization, in particular to a red mud treatment method based on flue gas desulfurization.
Background
The red mud is a byproduct in the production process of alumina, and 0.8-1.5 tons of red mud can be produced when one ton of alumina is produced. The red mud is alkaline, no particularly good resource method exists at present, most of domestic red mud is treated in a stockpiling mode, a large amount of land is occupied, and secondary pollution risk exists. Alumina plants are energy consuming households, generally have self-contained power stations, and need to purchase a large amount of limestone for flue gas desulfurization. With the increase of national requirements for mining, the price of limestone shows a rising trend.
Since red mud is used as alkaline solid waste and the main components thereof include calcium oxide, iron oxide, aluminum oxide, silicon dioxide, sodium oxide, etc., some researchers have proposed the use of red mud as a roadbed material. Because the red mud contains part of sodium alkali, the whitening phenomenon caused by sodium alkali dissolution can occur after the red mud is used for a roadbed, so the dealkalization of the red mud becomes an important step for resource utilization of the red mud.
Disclosure of Invention
The invention aims to provide a red mud treatment method based on flue gas desulfurization, which combines flue gas desulfurization and red mud dealkalization to treat wastes with processes of wastes against one another, thereby not only solving the problem of the source of an absorbent for flue gas desulfurization, but also solving the problem of red mud dealkalization according to local conditions.
In order to solve the technical problems, the invention provides a red mud treatment method based on flue gas desulfurization, which is carried out in a tower body comprising a dealkalization tower and a desulfurization tower which are connected in series, boiler flue gas sequentially enters the dealkalization tower and the desulfurization tower, and red mud slurry sequentially enters the desulfurization tower and the dealkalization tower.
In the dealkalizing tower: the boiler flue gas contacts the red mud slurry entering the dealkalizing tower from the desulfurizing tower, alkaline substances in the red mud slurry are removed, and the dealkalized red mud slurry is discharged out of the dealkalizing tower; meanwhile, the temperature of the boiler flue gas is reduced and enters the desulfurizing tower from the dealkalizing tower.
In the desulfurizing tower: boiler flue gas entering the desulfurizing tower from the dealkalizing tower contacts with the red mud slurry in the desulfurizing tower, sulfur dioxide in the boiler flue gas is removed, and clean flue gas is discharged out of the desulfurizing tower; meanwhile, the pH value of the red mud slurry is reduced and enters the dealkalization tower from the desulfurization tower.
Wherein the pH value of the red mud slurry in the desulfurizing tower is more than or equal to 5.6; the pH value of the red mud slurry in the dealkalizing tower is less than or equal to 4.5.
Wherein the temperature of the boiler flue gas in the dealkalizing tower is 90-100 ℃; the temperature of the boiler flue gas in the desulfurizing tower is 55-60 ℃.
Further, when the concentration of chloride ions in the dealkalizing tower reaches 4000-1200000 mg/L, discharging the absorption liquid in the dealkalizing tower, and supplementing process water into the dealkalizing tower. Preferably, when the concentration of chloride ions in the dealkalization tower reaches 10000mg/L, discharging the absorption liquid in the dealkalization tower and supplementing process water to the dealkalization tower.
In the red mud treatment method based on flue gas desulfurization provided by the invention, the dealkalization tower and the desulfurization tower are sequentially arranged along the direction of the flue gas of the boiler. Boiler flue gas enters the series-connected tower body from the dealkalizing tower, subsequently enters the desulfurizing tower from the dealkalizing tower, desulfurization is completed in the desulfurizing tower, and the obtained clean flue gas is discharged from the desulfurizing tower.
In the red mud treatment method based on flue gas desulfurization, a conveying pump is arranged between the desulfurizing tower and the dealkalizing tower, and the red mud slurry is conveyed from the desulfurizing tower to the dealkalizing tower under the action of the conveying pump. The red mud slurry enters a series-connected tower body from a desulfurizing tower, subsequently enters a dealkalizing tower from the desulfurizing tower, dealkalization is completed in the dealkalizing tower, and the obtained dealkalized red mud is discharged from the dealkalizing tower.
In the red mud treatment method based on flue gas desulfurization, provided by the invention, the spray component is arranged in the dealkalization tower, and the red mud slurry entering the dealkalization tower from the desulfurization tower is sprayed down by the spray component and is in reverse contact with the boiler flue gas in the dealkalization tower, so that the sufficient contact and reaction of the red mud slurry in the dealkalization tower and the boiler flue gas are ensured.
According to the red mud treatment method based on flue gas desulfurization, provided by the invention, the spray part is arranged in the desulfurization tower, and the red mud slurry in the desulfurization tower is sprayed by the spray part and then reversely contacts with the boiler flue gas entering the desulfurization tower from the dealkalization tower, so that the sufficient contact and reaction of the red mud slurry in the desulfurization tower and the boiler flue gas are ensured.
In the red mud treatment method based on flue gas desulfurization provided by the invention, the boiler flue gas and the red mud are boiler flue gas and red mud of an alumina plant self-prepared power station.
Compared with the prior art, the red mud treatment method based on flue gas desulfurization provided by the invention is carried out based on two serially connected tower bodies of a dealkalization tower and a desulfurization tower, and the functions of red mud dealkalization and flue gas desulfurization are respectively realized. Wherein, the pH value of the dealkalizing tower is relatively low, and the dealkalizing tower has the main functions of washing alkaline substances in the red mud and exchanging heat; the desulfurizing tower has a high pH value and has the main functions of absorbing acidic substances in the boiler flue gas and removing sulfur dioxide in the flue gas.
The red mud treatment method based on flue gas desulfurization provided by the invention is based on the idea of treating waste by waste, not only can solve the problem of the source of the absorbent for flue gas desulfurization, but also can solve the problem of dealkalization of the red mud, and lays a foundation for the subsequent resource utilization of the red mud.
Drawings
Fig. 1 is a schematic process flow diagram of red mud treatment based on flue gas desulfurization according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to examples, but the scope of the present invention as claimed is not limited to the scope shown in the examples.
The embodiment of the invention provides a red mud treatment method based on flue gas desulfurization, which is carried out in a tower body which comprises a dealkalizing tower and a desulfurizing tower and is connected in series. As shown in fig. 1, the dealkalizing tower T1 and the desulfurizing tower T2 are arranged in sequence along the direction of the boiler flue gas 11: the boiler flue gas 11 sequentially enters a dealkalizing tower T1 and a desulfurizing tower T2, and the red mud slurry 21 sequentially enters a desulfurizing tower T2 and a dealkalizing tower T1.
The boiler flue gas 11 is firstly introduced into a dealkalizing tower T1, in a dealkalizing tower T1, the boiler flue gas 11 is in reverse contact with the red mud slurry 22 which enters the dealkalizing tower T1 from a desulfurizing tower T2 and is sprayed under the action of a dealkalizing tower spraying part P1, alkaline substances in the red mud slurry 22 are removed, and the dealkalized red mud slurry 23 is discharged out of a dealkalizing tower T1; meanwhile, the boiler flue gas 11 exchanges heat with the red mud slurry 22, and the cooled boiler flue gas 12 enters the desulfurizing tower T2 from the dealkalizing tower T1.
The red mud slurry 21 is first introduced into a desulfurization tower T2, and at the same time, oxidizing air 20 is introduced into the desulfurization tower T2 to provide oxygen required for the chemical reaction in the desulfurization tower T2. In a desulfurizing tower T2, the cooled boiler flue gas 12 entering a desulfurizing tower T2 from a dealkalizing tower T1 is in reverse contact with the red mud slurry 21 sprayed by a desulfurizing tower spraying part P2 in a desulfurizing tower T2, so that sulfur dioxide in the boiler flue gas 12 is removed, and the obtained clean flue gas 13 is discharged out of the desulfurizing tower T2; meanwhile, the pH value of the red mud slurry 21 is lowered, and the red mud slurry 22 with lowered pH value enters the dealkalizing tower T1 from the desulfurizing tower T2.
In the embodiment of the invention, the dealkalization tower and the desulfurization tower are connected in series to realize the functions of dealkalization of the red mud and desulfurization of the flue gas respectively. Wherein, the pH value of the dealkalizing tower is relatively low, and the dealkalizing tower has the main functions of washing alkaline substances in the red mud and exchanging heat; the desulfurizing tower has a high pH value and has the main functions of absorbing acidic substances in the boiler flue gas and removing sulfur dioxide in the flue gas.
In some embodiments of the invention, the pH of the red mud slurry in the desulfurization tower is greater than or equal to 5.6; the pH value of the red mud slurry in the dealkalizing tower is less than or equal to 4.5. The temperature of the boiler flue gas in the dealkalizing tower is 90-100 ℃; the temperature of the boiler flue gas in the desulfurizing tower is 55-60 ℃.
Specifically, the chemical reaction process occurring in the dealkalizing tower mainly comprises:
2HCl+Na2O＝2NaCl+H2O；
2HF+Na2O＝2NaF+H2O；
2HCl+CaO＝CaCl2+H2O；
2HF+CaO＝CaF2+H2O；
SO2+Na2O＝Na2SO3；
SO2+H2O＝H2SO3。
the chemical reaction process in the desulfurization tower mainly comprises the following steps:
SO2+CaO+1/2O2+2H2O＝CaSO4·2H2O。
through the process, the method provided by the invention is based on the idea of treating waste by waste, not only can solve the problem of the source of the absorbent for flue gas desulfurization, but also can solve the problem of dealkalization of the red mud, and lays a foundation for the subsequent resource utilization of the red mud.
Further, in some embodiments of the present invention, when the concentration of chloride ions in the dealkalization tower reaches 4000 to 1200000mg/L, the absorption liquid in the dealkalization tower is discharged, and the process water is supplemented to the dealkalization tower. In other embodiments of the present invention, when the concentration of chloride ions in the dealkalization tower reaches 10000mg/L, the absorption liquid in the dealkalization tower is discharged and the dealkalization tower is supplemented with process water. The process water has the functions of absorbing heat (in an evaporation mode), reducing the smoke temperature and creating better conditions for subsequent desulfurization reaction.
Further, in some embodiments of the present invention, a transfer pump is disposed between the desulfurization tower and the dealkalization tower, and the red mud slurry is transferred from the desulfurization tower to the dealkalization tower by the transfer pump. The red mud slurry enters a series-connected tower body from a desulfurizing tower, subsequently enters a dealkalizing tower from the desulfurizing tower, dealkalization is completed in the dealkalizing tower, and the obtained dealkalized red mud is discharged from the dealkalizing tower.
Further, in some embodiments of the present invention, a spray part is disposed in the dealkalization tower, and the red mud slurry entering the dealkalization tower from the desulfurization tower is sprayed by the spray part and then reversely contacts with the boiler flue gas in the dealkalization tower, so as to ensure sufficient contact and reaction between the red mud slurry in the dealkalization tower and the boiler flue gas.
Further, in some embodiments of the present invention, a spray part is disposed in the desulfurization tower, and the red mud slurry in the desulfurization tower is sprayed downward by the spray part and contacts with the boiler flue gas entering the desulfurization tower from the dealkalization tower in a reverse direction, so as to ensure sufficient contact and reaction between the red mud slurry in the desulfurization tower and the boiler flue gas.
The red mud treatment method based on flue gas desulfurization provided by the embodiment of the invention is particularly suitable for flue gas desulfurization of self-contained boilers of alumina plants and comprehensive treatment of red mud, wherein the boiler flue gas and the red mud are the boiler flue gas and the red mud of self-contained power stations of the alumina plants.
Variations and modifications to the above-described embodiments may occur to those skilled in the art based upon the disclosure and teachings of the above specification. Therefore, the present application is not limited to the specific embodiments disclosed and described above, and some modifications and variations of the present application should fall within the scope of the claims of the present application. In addition, although specific terms are used herein, they are used in a descriptive sense only and not for purposes of limitation.
Claims (10)
1. A red mud treatment method based on flue gas desulfurization, which is characterized in that,
the treatment method is carried out in a series-connected tower body comprising a dealkalizing tower and a desulfurizing tower, boiler flue gas sequentially enters the dealkalizing tower and the desulfurizing tower, and red mud slurry sequentially enters the desulfurizing tower and the dealkalizing tower;
in the dealkalizing tower: the boiler flue gas contacts the red mud slurry entering the dealkalizing tower from the desulfurizing tower, alkaline substances in the red mud slurry are removed, and the dealkalized red mud slurry is discharged out of the dealkalizing tower; meanwhile, the temperature of the boiler flue gas is reduced, and the boiler flue gas enters a desulfurizing tower from a dealkalizing tower;
in the desulfurizing tower: boiler flue gas entering the desulfurizing tower from the dealkalizing tower contacts with the red mud slurry in the desulfurizing tower, sulfur dioxide in the boiler flue gas is removed, and clean flue gas is discharged out of the desulfurizing tower; meanwhile, the pH value of the red mud slurry is reduced and enters the dealkalization tower from the desulfurization tower.
2. The red mud treatment method based on flue gas desulfurization according to claim 1, wherein the pH value of the red mud slurry in the desulfurization tower is greater than or equal to 5.6; the pH value of the red mud slurry in the dealkalizing tower is less than or equal to 4.5.
3. The red mud treatment method based on flue gas desulfurization according to claim 1, wherein the temperature of the boiler flue gas in the dealkalizing tower is 90-100 ℃; the temperature of the boiler flue gas in the desulfurizing tower is 55-60 ℃.
4. The red mud treatment method based on flue gas desulfurization according to claim 1, wherein when the concentration of chloride ions in the dealkalization tower reaches 4000-1200000 mg/L, the absorption liquid in the dealkalization tower is discharged, and process water is supplemented to the dealkalization tower.
5. The red mud treatment method based on flue gas desulfurization according to claim 4, wherein when the chloride ion concentration in the dealkalization tower reaches 10000mg/L, the absorption liquid in the dealkalization tower is discharged, and process water is supplemented to the dealkalization tower.
6. The red mud treatment method based on flue gas desulfurization according to claim 1, wherein the dealkalizing tower and the desulfurizing tower are arranged in sequence along the direction of the flue gas of the boiler.
7. The red mud treatment method based on flue gas desulfurization according to claim 1, wherein a transfer pump is arranged between the desulfurization tower and the dealkalization tower, and the red mud slurry is transferred from the desulfurization tower to the dealkalization tower under the action of the transfer pump.
8. The red mud treatment method based on flue gas desulfurization according to claim 1, wherein a spray part is provided in the dealkalization tower, and the red mud slurry entering the dealkalization tower from the desulfurization tower is sprayed by the spray part and then reversely contacts with the boiler flue gas in the dealkalization tower.
9. The red mud treatment method based on flue gas desulfurization according to claim 1, wherein a spray part is provided in the desulfurization tower, and the red mud slurry in the desulfurization tower is sprayed downward by the spray part and is in counter-current contact with the boiler flue gas entering the desulfurization tower from the dealkalization tower.
10. The red mud treatment method based on flue gas desulfurization of claim 1, wherein the boiler flue gas and the red mud are boiler flue gas and red mud of an alumina plant self-contained power station.
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