Novel calcium-process red mud flue gas double-desulfurization device and filter pressing circulation system

Abstract

The utility model discloses a novel calcium-process red mud flue gas double-desulfurization device and a filter-pressing circulating system, which relate to the technical field of red mud treatment and boiler flue gas desulfurization and comprise a primary desulfurization tower, a secondary desulfurization tower, a process water tank, a flue gas pipeline and a slurry circulating system, the interior of the first-stage desulfurization tower sequentially comprises a first-stage demister and a first-stage spraying pipe from top to bottom, the interior of the second-stage desulfurization tower sequentially comprises a second-stage demister and a second-stage spraying pipe from top to bottom, and the slurry circulating system comprises a slurry box and a pit; a two-stage desulfurization tower structure is adopted, each stage of desulfurization tower is provided with an independent spraying pipe, the flowing resistance of spraying liquid is greatly reduced, the flue gas desulfurization effect is effectively improved, meanwhile, a corresponding water supplementing pipeline and a circulating pipeline are arranged in a slurry tank and a pit, the circulating efficiency of slurry can be improved, and the circulating efficiency of the slurry can be improved. In addition, the PH value of the slurry box and the PH value of the pit can be controlled within the target range more easily, and therefore the flue gas treatment efficiency is further improved.

Description

Technical Field

[0001] The utility model relates to the technical fields of red mud treatment and boiler flue gas desulfurization, and particularly relates to a novel double desulfurization device for red mud and flue gas by calcium method. Background Technique

[0002] Red mud is an industrial solid waste discharged during the extraction of alumina in the aluminum industry. For every ton of alumina produced, 0.8 - 1.5 tons of red mud will be generated. Red mud contains alkaline components such as CaO, MgO, Na₂O, and Al₂O₃. Currently, there is no particularly good resource utilization method, resulting in a low utilization rate. Most of the domestic red mud is treated by stacking, which not only poses a great safety hazard but also causes great damage to the environment. Content of the Utility Model

[0003] The purpose of the utility model is to provide a novel double desulfurization device for red mud and flue gas by calcium method and a pressure filtration circulation system to solve the problems mentioned in the above background technique.

[0004] To solve the above technical problems, the first aspect of the utility model provides a novel double desulfurization device for red mud and flue gas by calcium method, which includes a primary desulfurization tower, a secondary desulfurization tower, a process water tank, a flue gas pipeline, and a slurry circulation system. It is characterized in that: inside the primary desulfurization tower, from top to bottom, there are a primary demister and a primary spray pipe in sequence; inside the secondary desulfurization tower, from top to bottom, there are a secondary demister and a secondary spray pipe in sequence;

[0005] The primary desulfurization tower also includes a primary flue gas inlet respectively arranged on its bottom side wall and a primary flue gas outlet on the top. The secondary desulfurization tower also includes a secondary flue gas inlet respectively arranged on its bottom side wall and a secondary flue gas outlet on the top. The primary flue gas outlet is connected to the secondary flue gas inlet through the flue gas pipeline;

[0006] On the upper side parts above the primary demister and the secondary demister, there are respectively a primary water inlet and a secondary water inlet. The output end of the process water tank is fixedly provided with a first water delivery pipeline and a second water delivery pipeline. The other output end of the first water delivery pipeline is connected to the primary water inlet, and the other output end of the second water delivery pipeline is connected to the secondary water inlet;

[0007] The slurry circulation system includes a slurry tank and a sump. The slurry tank inputs red mud slurry into the primary spray pipe through a slurry input pipeline, and a slurry supply pump is arranged on the slurry input pipeline;

[0008] At the bottom of the primary desulfurization tower, there are a first slurry discharge pipe and a second slurry discharge pipe. The output end of the first slurry discharge pipe is connected to the input end of the sump; there are three second slurry discharge pipes. The integrated output end of the three second slurry discharge pipes is connected to the top input end of the slurry tank, and slurry discharge pumps are arranged on all three second slurry discharge pipes;

[0009] There are two circulation pipes arranged at the top of the pit, which are respectively connected to the slurry replenishment port on the bottom side wall of the first-stage desulfurization tower and the other input end at the top of the slurry tank, and a circulation pump is arranged on the circulation pipe.

[0010] Furthermore, it further includes a makeup water tank. The makeup water tank is connected with a first makeup water pipeline and a second makeup water pipeline. The other end of the first makeup water pipeline is connected to the makeup water port on one side of the bottom of the first-stage desulfurization tower; the other end of the second makeup water pipeline is connected to the makeup water port at the top of the slurry tank.

[0011] Furthermore, a third water delivery pipe is fixedly arranged at the output end of the process water tank, and the other end of the third water delivery pipe is connected to the water input port at the top of the slurry tank.

[0012] Furthermore, a first-stage deflector plate and a first-stage filter plate are arranged below the first-stage spray pipe, and a second-stage deflector plate and a second-stage filter plate are arranged below the second-stage spray pipe.

[0013] Furthermore, there are three first-stage spray pipes and three second-stage spray pipes, and the three spray pipes are arranged at equal intervals.

[0014] Furthermore, agitators are arranged on both the slurry tank and the top of the pit.

[0015] Furthermore, oxidation blowers are arranged on one side of the bottom of both the first-stage desulfurization tower and the second-stage desulfurization tower.

[0016] Furthermore, the bottom of both the first-stage desulfurization tower and the second-stage desulfurization tower further includes side stirring members arranged below the oxidation blowers.

[0017] In the second aspect of the present invention, a pressure filtration circulation system is provided, including a pressure filtration system and the novel calcium method red mud flue gas double desulfurization device as described in any one of the above, and the pressure filtration system is connected to the first-stage desulfurization tower.

[0018] The beneficial effects of the present invention compared with the prior art are as follows:

[0019] The present invention adopts two-stage desulfurization towers, and each desulfurization tower is equipped with a separate spray pipe, which greatly reduces the resistance of the spray liquid flow, effectively improves the flue gas desulfurization effect, ensures the up-to-standard discharge of flue gas, has high desulfurization efficiency, thorough red mud dealkalization, can reduce the generation of toxic and harmful substances, and has low energy consumption; at the same time, makeup water pipelines and circulation pipelines are arranged in the slurry tank and the pit, which can not only improve the circulation efficiency of the slurry, but also make the pH values of the slurry tank and the pit easier to be controlled within the target range, thereby further improving the efficiency of the present invention in treating flue gas.

[0020] After the red mud slurry after desulfurization by the utility model is processed by a pressure filtration circulation system, the generated filtrate can flow back to the desulfurization tower for continuous recycling, reducing water consumption. Brief Description of the Drawings

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0022] Figure 1 It is a schematic structural diagram of an embodiment of the present application;

[0023] Among them: 1 - primary desulfurization tower, 101 - primary demister, 102 - primary spray pipe, 103 - primary flue gas inlet, 104 - primary flue gas outlet, 105 - primary water inlet, 106 - primary deflector, 107 - primary filter plate, 108 - first slurry discharge pipe, 109 - second slurry discharge pipe, 110 - slurry discharge pump, 2 - secondary desulfurization tower, 201 - secondary demister, 202 - secondary spray pipe, 203 secondary flue gas inlet, 204 - secondary flue gas outlet, 205 - secondary water inlet, 206 - secondary deflector, 207 - secondary filter plate, 3 - process water tank, 301 - first water conveyance pipeline, 302 - second water conveyance pipeline, 303 - third water conveyance pipeline, 4 - flue gas pipeline, 5 - slurry circulation system, 501 - slurry tank, 502 - pit, 503 - slurry input pipeline, 504 - slurry supply pump, 505 - circulation pipe, 506 - circulation pump, 507 - agitator, 6 - make-up water tank, 601 - make-up water pipeline, 70 - oxidation blower, 80 - side agitator, 9 - pressure filtration system. Detailed Embodiments

[0024] To make the purpose, technical solutions and advantages of the embodiments of the present utility model clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Therefore, the following detailed description of the embodiments of the present utility model provided in the drawings is not intended to limit the scope of the present utility model to be protected, but merely represents the selected embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present utility model.

[0025] In addition, those skilled in the art can select the specific models of the electrical components involved in this embodiment according to the actual working conditions, which are conventional technical means and will not be elaborated in this embodiment.

[0026] As Figure 1 shown, the embodiment of the present application discloses a new type of double desulfurization device for red mud flue gas by calcium method, which includes a primary desulfurization tower 1, a secondary desulfurization tower 2, a process water tank 3, a flue gas pipeline 4 and a slurry circulation system 5. Inside the primary desulfurization tower 1, from top to bottom, there are a primary demister 101 and a primary spray pipe 102 in sequence. Inside the secondary desulfurization tower 2, from top to bottom, there are a secondary demister 201 and a secondary spray pipe 202 in sequence;

[0027] The primary desulfurization tower 1 further includes a primary flue gas inlet 103 and a primary flue gas outlet 104 respectively arranged on its bottom side wall and top. The secondary desulfurization tower 2 further includes a secondary flue gas inlet 203 and a secondary flue gas outlet 204 respectively arranged on its bottom side wall and top. The primary flue gas outlet 104 is connected to the secondary flue gas inlet 203 through the flue gas pipeline 4;

[0028] On the upper side parts above the primary demister 101 and the secondary demister 201, a primary water inlet 105 and a secondary water inlet 205 are respectively opened. The output end of the process water tank 3 is fixedly provided with a first water delivery pipeline 301 and a second water delivery pipeline 302. The other output end of the first water delivery pipeline 301 is connected to the primary water inlet 105, and the other output end of the second water delivery pipeline 302 is connected to the secondary water inlet 205;

[0029] The slurry circulation system 5 includes a slurry tank 501 and a sump 502. The slurry tank 501 inputs red mud slurry into the primary spray pipe 102 through a slurry input pipeline 503, and a slurry supply pump 504 is arranged on the slurry input pipeline 503;

[0030] At the bottom of the primary desulfurization tower 1, a first slurry discharge pipe 108 and a second slurry discharge pipe 109 are arranged. The output end of the first slurry discharge pipe 108 is connected to the input end of the sump 502; There are three second slurry discharge pipes 109, and the integrated output end of the three second slurry discharge pipes 109 is connected to the top input end of the slurry tank 501, and slurry discharge pumps 110 are arranged on all three second slurry discharge pipes 109;

[0031] On the top of the sump 502, there are two circulation pipes 505, which are respectively connected to the slurry replenishment port on the bottom side wall of the primary desulfurization tower 1 and the other top input end of the slurry tank 501, and a circulation pump 506 is arranged on the circulation pipe 505.

[0032] The utility model adopts a two-stage desulfurization tower structure, and each stage of the desulfurization tower is equipped with a separate spray pipe, which greatly reduces the resistance of the spray liquid flow, effectively improves the flue gas desulfurization effect, ensures the up-to-standard discharge of flue gas, has high desulfurization efficiency, thorough red mud de-alkalization, can reduce the generation of toxic and harmful substances, and has low energy consumption. At the same time, the setting of the circulation pipe 505 and the second water supply pipe 602 can not only improve the circulation efficiency of the slurry, but also make the pH values of the slurry tank 501 and the sump 502 easier to be controlled within the target range, thereby further improving the efficiency of the utility model in treating flue gas.

[0033] The embodiment of the present application adopts a first-stage and second-stage desulfurization tower structure. The first-stage desulfurization tower 1 and the second-stage desulfurization tower 2 do not mix with each other, which can reduce the usage amount of raw materials such as calcium hydroxide and ensure the operation safety and stability of the desulfurization system.

[0034] The two-stage desulfurization tower can adopt a combination of a first-stage red mud desulfurization tower and a second-stage conventional calcium method wet desulfurization tower, or can also adopt a combination of a first-stage conventional calcium method wet desulfurization tower or a second-stage red mud desulfurization tower, and the comparison is not limited.

[0035] Specifically, the embodiment of the present application further includes a water supply tank 6. The water supply tank 6 is connected with a first water supply pipe 601 and a second water supply pipe 602. The other end of the first water supply pipe 601 is connected to the water supply port on one side of the bottom of the first-stage desulfurization tower 1; the other end of the second water supply pipe 602 is connected to the top water supply port of the slurry tank 501.

[0036] Specifically, a third water delivery pipe 303 is fixedly arranged at the output end of the process water tank 3 in the embodiment of the present application, and the other end of the third water delivery pipe 303 is connected to the top water inlet of the slurry tank 501.

[0037] The embodiment of the present application does not limit the process water in the process water tank 3. Optionally, the waste water from chemical water production sewage and cleaning discharge can be used, or the return water of the pressure filtration system 9 can also be used. Reasonable use of waste water or return water can reduce the negative impact on the environment. By effectively treating and discharging the waste water or return water, the demand for water resources can be reduced, and at the same time, the pollutant load discharged into the environment can be reduced.

[0038] By stably delivering the process water to the slurry tank 501 through the third water delivery pipe 303, it can ensure that there is always enough water source in the slurry tank 501, thereby ensuring the uniformity of the slurry and the stability of the pH value.

[0039] Specifically, a first-stage guide plate 106 and a first-stage filter plate 107 are further arranged below the first-stage spray pipe 102 in the embodiment of the present application, and a second-stage guide plate 206 and a second-stage filter plate 207 are further arranged below the second-stage spray pipe 202.

[0040] The flue gas after demisting passes through the subsequent deflector plates and filter plates, which can greatly improve the filtering effect on the flue gas.

[0041] Specifically, three primary spray pipes 102 and three secondary spray pipes 202 are provided in the embodiments of the present application, and the three spray pipes are arranged at equal intervals.

[0042] Using a multi-layer spray structure can evenly refine the liquid into tiny droplets. These droplets are evenly distributed in the air flow, with a wide coverage area, and can effectively cover all areas inside the equipment, effectively improving the uniformity of the air flow distribution inside the equipment, thereby reducing the influence of aerosols carried out due to uneven air flow.

[0043] Specifically, agitators 507 are provided on the tops of the slurry tank 501 and the sump 502 in the embodiments of the present application, which can be agitated to prevent pipeline blockage and ensure the desulfurization effect.

[0044] Specifically, an oxidation blower 70 is provided on one side of the bottom of the primary desulfurization tower 1 and the secondary desulfurization tower 2 in the embodiments of the present application.

[0045] The oxidation blower 70 arranged at the bottom of the tower can effectively generate a strong air flow. This air flow forms continuous agitation and flow in the bottom area of the tower. Through this air flow agitation, the red mud will not settle at the bottom to form sediment, but is continuously disturbed and suspended, preventing the accumulation and stacking of red mud.

[0046] Specifically, the bottoms of the primary desulfurization tower 1 and the secondary desulfurization tower 2 in the embodiments of the present application further include side agitators 80 arranged below the oxidation blower 70.

[0047] The oxidation blower 70 arranged at the bottom of the tower and the side agitator 80 work together, which can effectively prevent the red mud from accumulating at the bottom; the oxidation blower provides sufficient oxygen, and at the same time, with the continuous agitation of the side agitator 80, the red mud is kept in a flowing state, preventing the red mud from accumulating and forming lumps at the bottom of the reaction tower. This combined effect not only improves the reaction efficiency, but also extends the service life of the equipment, reduces the maintenance cost and downtime of the equipment.

[0048] The embodiments of the present application do not specifically limit the number of the side agitators 80. Four side agitators 80 or multiple side agitators 80 can be arranged around the bottom of the tower, or only one side agitator 80 can be selected according to the actual situation.

[0049] The embodiments of the present application also disclose a pressure filtration circulation system, including a pressure filtration system 9. The pressure filtration system 9 is connected to the primary desulfurization tower 1. Specifically, the input end of the pressure filtration system 9 is connected to the other end of the integrated output end of the three second slurry discharge pipes 109, and the filtrate output from the output end of the pressure filtration system 9 can be selectively refluxed to the make-up water tank 6 or the alumina sedimentation system (not shown in the figure).

[0050] Specifically, the filter press system 100 includes a lime milk tank, a filter press water tank, and a filter press water tank water supply pump (not shown in the figure) that are connected in sequence. A stirrer 507 is also installed on the top of the filter press water tank. During operation, lime powder and slurry are first added to the lime milk tank for mixing, and then mixed with the slurry discharged by the slurry discharge pump 110 in the filter press water tank and subjected to filter press treatment. The filtered water after treatment is pumped back to the slurry tank 10 or the make-up water tank 6 through the filter press water tank water supply pump for further utilization.

[0051] The red mud after desulfurization of the present utility model is treated by a filter press circulation system, and the generated filtrate can flow back to the desulfurization system for continuous recycling, reducing water consumption.

[0052] The specific working process of the embodiment of the present application is as follows:

[0053] First, the red mud slurry after iron extraction in the Bayer process alumina system is pumped to the slurry tank 501 through an external discharge pump, and then the red mud slurry is pumped to the first-stage spray pipe 102 in the first-stage desulfurization tower 1 by a slurry supply pump 504. Sodium hydroxide in the red mud is mixed with the flue gas entering through the first-stage flue gas inlet 103, and fully reacts and neutralizes with components such as sulfur dioxide and carbon dioxide in the flue gas for atomization desulfurization. Then the flue gas enters the second-stage desulfurization tower 2 through the flue gas pipeline 4 for desulfurization again. The second-stage desulfurization tower 2 is a conventional wet spray desulfurization system to achieve ultra-low emissions. If the spray volume of the red mud slurry in the first-stage tower can meet the requirements of ultra-low emissions of desulfurization, the second-stage spray pipe 202 of the second-stage desulfurization tower 2 can operate with a small amount or stop running.

[0054] The first-stage desulfurization tower 1 simultaneously uses waste gases such as carbon dioxide and sulfur dioxide in the flue gas for red mud de-alkalization. The de-alkalized slurry falls to the bottom for further reaction and de-alkalization, and then the red mud slurry is pumped back to the slurry tank 501 for recycling through the slurry discharge pump 110 at the bottom, or directly discharged into the sump 502 through the first discharge pipe 108. After further mixing in the sump 502, it flows back to the bottom of the tower through the circulation pipe 505 and the circulation pump 506 for use.

[0055] The slurry de-alkalized by the first-stage desulfurization tower 1 is further mixed and de-alkalized at the bottom of the tower. Then, the red mud slurry can also be pumped to the alumina system through the bottom slurry discharge pump 110, and then subjected to filter press treatment through the filter press system 90. The filtered liquid from the filter press can also be filtered in the filter press water tank after adding calcium hydroxide or sodium removal treatment. The treated filtered liquid can then flow back to the alumina system or the desulfurization tower for continuous recycling, reducing water consumption.

[0056] The red mud after filter press can be used for resource utilization such as soil fertilizer and building materials due to the residual small amount of ammonium sulfate.

[0057] It can be seen that the utility model is a new type of calcium-based red mud flue gas dual desulfurization device. The two-stage desulfurization tower can adopt a combination of a first-stage red mud desulfurization tower and a second-stage conventional desulfurization tower. It can also adopt a combination of a first-stage conventional desulfurization tower or a second-stage red mud desulfurization tower. Each stage of the desulfurization tower is equipped with a separate spray pipe, which greatly reduces the resistance to the flow of the spray liquid, effectively improves the flue gas desulfurization effect, ensures that the flue gas meets the emission standards, has high desulfurization efficiency, and completely removes the alkali of the red mud, and can reduce the generation of toxic and harmful substances, and has low energy consumption. At the same time, water supply pipes and circulation pipes are set in the slurry tank 501 and the pit 502, which can not only improve the circulation efficiency of the slurry, but also make the pH value of the slurry tank 501 and the pit 502 easier to be controlled within the target range, thereby further improving the efficiency of the utility model in treating flue gas.

[0058] The utility model discloses a filter pressing circulation system, which enables the red mud after desulfurization to be processed by filter pressing, and the generated filtrate can be returned to the desulfurization system for continuous circulation, thereby reducing water consumption.

[0059] It should be noted that, for those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is limited by the attached claims rather than the above description, so it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the present invention, and any figure mark in the claims should not be regarded as limiting the claims involved.

[0060] The utility model uses specific examples to illustrate the principle and implementation of the utility model. The above is only the preferred implementation of the utility model and is not used to limit the utility model. For those skilled in the art, the utility model can have various changes and variations. Any modification, equivalent replacement, improvement, etc. made to it without departing from the principle and spirit of the utility model shall be included in the protection scope of the utility model.

Claims

1. A novel calcium-based red mud flue gas dual desulfurization device, comprising a primary desulfurization tower (1), a secondary desulfurization tower (2), a process water tank (3), a flue gas pipeline (4) and a slurry circulation system (5), characterized in that: The first-stage desulfurization tower (1) includes a first-stage demister (101) and a first-stage spray pipe (102) from top to bottom, and the second-stage desulfurization tower (2) includes a second-stage demister (201) and a second-stage spray pipe (202) from top to bottom. The primary desulfurization tower (1) further comprises a primary smoke inlet (103) and a primary smoke outlet (104) respectively arranged on the bottom side wall thereof, and the secondary desulfurization tower (2) further comprises a secondary smoke inlet (203) and a secondary smoke outlet (204) respectively arranged on the bottom side wall thereof, and the primary smoke outlet (104) is connected to the secondary smoke inlet (203) via the smoke duct (4); A primary water inlet (105) and a secondary water inlet (205) are respectively provided on the upper side of the primary demister (101) and the secondary demister (201); a first water pipeline (301) and a second water pipeline (302) are fixedly provided at the output end of the process water tank (3); the other output end of the first water pipeline (301) is connected to the primary water inlet (105), and the other output end of the second water pipeline (302) is connected to the secondary water inlet (205); The slurry circulation system (5) comprises a slurry tank (501) and a pit (502), wherein the slurry tank (501) inputs red mud slurry into the primary spray pipe (102) via a slurry input pipeline (503), and a slurry supply pump (504) is provided on the slurry input pipeline (503); A first row of slurry pipes (108) and a second row of slurry pipes (109) are provided at the bottom of the primary desulfurization tower (1), the output end of the first row of slurry pipes (108) being connected to the input end of the pit (502); there are three second row of slurry pipes (109), the integrated output ends of the three second row of slurry pipes (109) being connected to the top input end of the slurry tank (501), and slurry pumps (110) are provided on the three second row of slurry pipes (109); Two circulation pipes (505) are arranged at the top of the pit (502), which are respectively connected to the slurry feeding port on the bottom side wall of the primary desulfurization tower (1) and the other input end at the top of the slurry tank (501), and a circulation pump (506) is arranged on the circulation pipe (505).

2. The novel calcium-based red mud flue gas dual desulfurization device according to claim 1 is characterized in that: It also includes a water replenishment tank (6), which is connected to a first water replenishment pipe (601) and a second water replenishment pipe (602), the other end of the first water replenishment pipe (601) is connected to the water replenishment port on the bottom side of the primary desulfurization tower (1); the other end of the second water replenishment pipe (602) is connected to the top water replenishment port of the slurry tank (501).

3. The novel calcium-based red mud flue gas dual desulfurization device according to claim 1 is characterized in that: A third water delivery pipe (303) is also fixedly provided at the output end of the process water tank (3), and the other end of the third water delivery pipe (303) is connected to the top water delivery port of the slurry tank (501).

4. The novel calcium-based red mud flue gas dual desulfurization device according to claim 1 is characterized in that: A primary guide plate (106) and a primary filter plate (107) are also provided at the lower portion of the primary spray pipe (102), and a secondary guide plate (206) and a secondary filter plate (207) are also provided at the lower portion of the secondary spray pipe (202).

5. The novel calcium-based red mud flue gas dual desulfurization device according to claim 4 is characterized in that: There are three first-level spray pipes (102) and three second-level spray pipes (202), and the three spray pipes are arranged at equal intervals.

6. The novel calcium-based red mud flue gas dual desulfurization device according to claim 1 is characterized in that: The slurry tank (501) and the top of the pit (502) are both provided with a stirrer (507).

7. The novel calcium-based red mud flue gas dual desulfurization device according to claim 1 is characterized in that: An oxidation fan (80) is provided on one side of the bottom of each of the primary desulfurization tower (1) and the secondary desulfurization tower (2).

8. The novel calcium-based red mud flue gas dual desulfurization device according to claim 7 is characterized in that: The bottom of the primary desulfurization tower (1) and the secondary desulfurization tower (2) further include a side stirring member (90) arranged at the lower part of the oxidation blower (80).

9. A filter press circulation system, characterized in that: It comprises a filter press system (9), a novel calcium-based red mud flue gas dual desulfurization device as claimed in any one of claims 1 to 8, wherein the filter press system (9) is connected to the primary desulfurization tower (1).

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