Multi-stage resource treatment of red mud and flue gas desulfurization system

Abstract

The utility model discloses a kind of bauxite multi-section resource processing and flue gas desulfurization coordination system, belong to the technical field of alumina production.The bauxite multi-section resource processing and flue gas desulfurization coordination system mainly includes bauxite stirring mechanism, spraying mechanism, PH adjusting mechanism and filtering mechanism.The side of the bauxite stirring mechanism is connected with the spraying mechanism, the spraying mechanism is provided with spraying container, and the inside of the spraying container is provided with spraying chamber;The upper side of the spraying chamber is provided with second cover body, the inside of the second cover body is provided with inner chamber, the bottom of the second cover body is provided with spraying port, and the top of the second cover body is provided with second feed inlet;The side of the spraying container is connected with the PH adjusting mechanism;The side of the PH adjusting mechanism is connected with the filtering mechanism.Compared with prior art, the utility model recovers iron element in bauxite, reduces the degree of resource waste to some extent, thus, it has higher practicality.

Description

Technical Field

[0001] This utility model relates to the field of alumina production technology, and in particular to a multi-stage resource utilization system for red mud and a synergistic system for flue gas desulfurization. Background Technology

[0002] my country's alumina industry ranks among the world's largest, but for every ton of alumina produced, 1.0 to 2.0 tons of highly alkaline red mud are generated; if not properly handled, the red mud may pollute groundwater, oceans and the atmosphere.

[0003] Existing treatment methods typically rely on stockpiling or a single dealkali removal process; however, these methods fail to effectively recover iron from red mud, resulting in significant resource waste. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides a multi-stage resource recovery and flue gas desulfurization synergistic system for red mud, primarily comprising a red mud stirring mechanism, a spraying mechanism, a pH adjustment mechanism, and a filtration mechanism. In operation, under the action of the pH adjustment mechanism, the filtration mechanism receives the slurry delivered by the spraying mechanism; then, the filtration mechanism filters out the ferric hydroxide from the slurry; simultaneously, the spraying mechanism sprays the red mud slurry prepared by the red mud stirring mechanism onto the sulfide-containing flue gas generated during the alumina production process in the external roasting furnace. This design removes sulfides from the flue gas and achieves the purpose of dealkalizing the red mud. Compared to existing technologies, this utility model recovers iron from the red mud, reducing resource waste to a certain extent, thus possessing high practicality.

[0005] To achieve the above objectives, this utility model provides the following technical solution: A multi-stage resource utilization and flue gas desulfurization synergistic system for red mud includes: A red mud stirring mechanism is used to prepare red mud slurry, and the red mud stirring mechanism is equipped with a stirring component; A spraying mechanism, used to spray the red mud slurry onto the flue gas generated during the alumina preparation process in an external roasting furnace, includes: A spray container with a spray chamber inside, the spray chamber being connected to the roasting furnace; The second cover is disposed on the upper side of the spray chamber. The interior of the second cover has an inner cavity, the bottom of the second cover has a spray port, and the top of the second cover has a second feed port. The second feed inlet is connected to the red mud stirring mechanism; The pH adjustment mechanism is connected to the spray container; The filtration mechanism is connected to the pH adjustment mechanism.

[0006] Furthermore, the spraying mechanism also includes: A sulfide concentration sensor is installed in the spray chamber; A second smoke vent is provided on the side of the inner wall of the spray container; The second air valve is located at the second smoke exhaust port; in, During use, staff can adjust the current operating status of the second gas valve based on the information detected by the sulfide concentration sensor.

[0007] Furthermore, the red mud stirring mechanism includes: Stirring container; The stirring container is disposed on one side of the spraying mechanism, and the stirring container is connected to the second feed inlet; The stirring surface of the stirring component is located inside the stirring container; in, The red mud slurry in the mixing container can enter the spray chamber through the second feed inlet, the inner cavity, and the spray nozzle.

[0008] Further, the stirring component includes: A stirring motor is installed at the top of the stirring container; A rotating shaft is vertically installed inside the stirring container, and one end of the rotating shaft is connected to the drive end of the stirring motor; The stirring blades are arranged in a plurality of manners, and the stirring blades are arranged around the periphery of the rotating shaft.

[0009] Furthermore, the stirring component also includes: Bearings; The bearing is rotatably connected to the rotating shaft, and the outer wall of the bearing is connected to the inner wall of the stirring container.

[0010] Furthermore, there is a certain distance between the other end of the rotating shaft and the bottom of the inner wall of the stirring container.

[0011] Furthermore, a feed chute is provided on one side of the mixing container.

[0012] Furthermore, the pH adjustment mechanism includes: pH adjustment container; A delivery pipeline, one end of which is located on the upper side of the pH adjustment container, extends toward the interior of the pH adjustment container.

[0013] Furthermore, the pH adjustment mechanism also includes: A cover plate is installed on one end of the conveying pipeline.

[0014] Furthermore, the filtration mechanism includes: The filter tank is connected to the pH adjustment container; The filter screen has its side connected to the inner wall of the filter tank, and there is a certain distance between the filter screen and the bottom of the inner wall of the filter tank.

[0015] The beneficial effects of this utility model are: 1. The multi-stage resource utilization and flue gas desulfurization synergistic system for red mud provided by this utility model is equipped with a spraying mechanism, which can receive the red mud slurry transported by the red mud stirring mechanism and the flue gas containing sulfides generated during the preparation of alumina in the calcining furnace, and spray the red mud slurry onto the flue gas containing sulfides. This design not only removes sulfides from the flue gas, but also achieves the purpose of dealkalizing the red mud, and to a certain extent plays a role in protecting the ecological environment.

[0016] 2. The multi-stage resource utilization and flue gas desulfurization synergistic system for red mud is equipped with a pH adjustment mechanism, which can receive the slurry delivered by the spraying mechanism; then, adjust the pH value of the slurry. This design provides the prerequisite for the subsequent recovery of iron from the slurry.

[0017] 3. The multi-stage resource recovery and flue gas desulfurization system for red mud is equipped with a filtration mechanism that can receive the slurry delivered by the pH adjustment mechanism. Then, the filtration mechanism can filter out the ferric hydroxide in the slurry. This design recovers the iron element in the red mud, thereby reducing the degree of resource waste. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This utility model Figure 1 Another perspective; Figure 3 This is a simplified internal structural diagram of the stirring container of this utility model; Figure 4 This is a simplified internal structural diagram of the spray container of this utility model.

[0019] Figure label: 1. Red mud mixing mechanism; 11. Mixing container; 111. Mixing chamber; 112. First feed inlet; 113. Feed trough; 114. First cover; 115. First discharge outlet; 12. Mixing component; 121. Mixing motor; 122. Rotating shaft; 123. Mixing blade; 2. Firing oven; 3. Spraying mechanism; 31. Spraying container; 311. Spraying chamber; 312. Second cover; 3121. Second feed inlet; 3122. Inner cavity; 3123. Spray nozzle; 313. Smoke inlet; 314. First smoke outlet; 315. Second smoke outlet; 316. Second discharge outlet; 317. First support; 32. Water valve; 33. First air valve; 34. Second air valve; 35. Additional spraying container; 4. pH adjustment mechanism; 41. pH adjustment container; 42. Delivery pipeline; 43. Cover plate; 44. Second support; 5. Filtration mechanism; 51. Filtration tank; 52. Filter screen; 6. Guiding airway; 61. First trachea; 62. Second trachea; 63. Third trachea; 64. Fourth trachea; 7. Water delivery pipe; 71. First water pipe; 72. Second water pipe; 73. Third water pipe; 74. Fourth water pipe; 75. Fifth water pipe; 76. Sixth water pipe; 771. First water pump; 772. Second water pump; 773. Third water pump; 774. Fourth water pump. Detailed Implementation

[0020] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0021] As attached Figure 1-4 As shown in the figure, this embodiment discloses a multi-stage resource utilization and flue gas desulfurization synergistic system for red mud, which is used to recover iron from red mud. It mainly includes a red mud stirring mechanism 1, a spraying mechanism 3, a pH adjustment mechanism 4, and a filtration mechanism 5. The red mud stirring mechanism 1 can fully mix tap water and red mud to produce red mud slurry. The external roasting furnace 2 is used to calcine aluminum hydroxide solids to prepare alumina. During the preparation of alumina, flue gas containing sulfides is generally generated. The spraying mechanism 3 is connected to the red mud stirring mechanism 1 and the roasting furnace 2. The spraying mechanism 3 is used to spray the red mud slurry onto the flue gas containing sulfides to achieve the effect of dealkalization. The spraying mechanism 3 is connected to the pH adjustment mechanism 4 to adjust the pH value of the slurry delivered by the spraying mechanism 3. The pH adjustment mechanism 4 is connected to the filtration mechanism 5 to receive the slurry delivered by the pH adjustment mechanism 4. Furthermore, the filtration mechanism 5 can filter out ferric hydroxide in the slurry. This design recovers the iron element in the red mud, thereby reducing the degree of resource waste.

[0022] In use, the operator first pours red mud into the red mud stirring mechanism 1, and then adds tap water in the appropriate proportion according to the amount of red mud added; then, a control unit (not shown in the figure) is operated to start the stirring component 12; after a period of time, the tap water and red mud are fully mixed, thus completing the preparation of red mud slurry of the corresponding concentration; then, the red mud slurry is transported to the spraying mechanism 3; in addition, the preceding aluminum hydroxide solid preparation process transports aluminum hydroxide solid from the feed port (not shown in the figure) of the external calcining furnace 2 into the calcining furnace 2; then, the calcining furnace 2 calcines the received aluminum hydroxide solid to produce alumina; of course, the calcining furnace 2 is equipped with a discharge port (not shown in the figure), this design This design facilitates the removal of the prepared alumina by staff using appropriate equipment. During the alumina preparation process, flue gas containing sulfides is typically generated. The roasting furnace 2 then guides the flue gas to the spraying mechanism 3. Simultaneously, the spraying mechanism 3 sprays red mud slurry onto the flue gas containing sulfides. This design removes sulfides from the flue gas and achieves the purpose of dealkalizing the red mud. Since the flue gas containing sulfides is acidic and the red mud slurry is alkaline, a neutralization reaction occurs when the flue gas and red mud slurry come into contact. This design achieves both desulfurization of the flue gas and dealkalization of the red mud, thus contributing to the protection of the ecological environment to a certain extent.

[0023] Then, the spraying mechanism 3 transports the slurry produced after dealkalization to the pH adjustment mechanism 4. The pH adjustment mechanism 4 then adjusts the pH of the slurry to alkaline, which is existing technology and will not be elaborated further. This design also provides a prerequisite for the subsequent recovery of iron from the slurry. The pH adjustment mechanism 4 then transports the alkaline slurry to the filtration mechanism 5. The filtration mechanism 5 then filters out ferric hydroxide from the alkaline slurry. Normally, the filtered ferric hydroxide reacts with air to produce ferric oxide, which can be used as a pigment. This design recovers iron from the red mud, thereby reducing resource waste. Furthermore, the liquid produced by the filtration mechanism 5 can be transported to other processing steps, thus reducing the environmental pollution caused by this embodiment, which is existing technology and will not be elaborated further.

[0024] The specific structure of the multi-stage resource utilization and flue gas desulfurization synergistic system for red mud is as follows: It includes a red mud stirring mechanism 1, in which a stirring component 12 is provided; a spraying mechanism 3 is connected to one side of the red mud stirring mechanism 1, and an external roasting furnace 2 is connected to the side of the spraying mechanism 3; a spraying container 31 is provided in the spraying mechanism 3, and a spraying chamber 311 is opened inside the spraying container 31, which is connected to the red mud stirring mechanism 1; a second cover 312 is provided on the upper side of the spraying chamber 311. The cover 312 has an inner cavity 3122. The bottom of the second cover 312 has several spray nozzles 3123, and the top of the second cover 312 has a second feed inlet 3121. The second feed inlet 3121 is connected to the red mud stirring mechanism 1, meaning that the red mud slurry in the red mud stirring mechanism 1 can enter the spray chamber 311 through the second feed inlet 3121, the inner cavity 3122, and the spray nozzles 3123. A pH adjustment mechanism 4 is connected to one side of the spray container 31, and a filter mechanism 5 is connected to one side of the pH adjustment mechanism 4. Compared with the prior art, this invention recovers iron from the red mud, reducing resource waste to a certain extent, and therefore has high practicality.

[0025] In a specific application scenario, as shown in the appendix Figure 4 As shown, the spraying mechanism 3 also includes a sulfide concentration sensor (not shown) and a second air valve 34. The sulfide concentration sensor is located inside the spraying chamber 311. A second exhaust port 315 is provided on the side of the inner wall of the spraying container 31, and the second air valve 34 is located at the second exhaust port 315. In use, the sulfide concentration sensor can identify the flue gas guided to the second exhaust port 315 and obtain the sulfide content in the flue gas. If the content meets the corresponding needs of the staff, the control unit can be operated to switch the working state of the second air valve 34 to closed, that is, the flue gas at the second exhaust port 315 can be discharged to the outside. Of course, in order to better protect the ecological environment, the staff can also guide the flue gas leaving the second exhaust port 315 to other flue gas treatment equipment (not shown) to remove other harmful substances in the flue gas. This is existing technology, and the relevant content will not be elaborated.

[0026] In a specific application scenario, as shown in the appendix Figure 1 and appendix Figure 3 As shown, the red mud mixing mechanism 1 is provided with a mixing container 11, which is located in front of the spraying mechanism 3. The mixing container 11 is connected to the second feed inlet 3121. The mixing container 11 has a mixing chamber 111 inside, and a first cover 114 is provided on the upper side of the mixing chamber 111. The mixing container 11 has a mixing surface of the mixing component 12 inside. This design makes it easy to install the mixing component 12 on the mixing container 11.

[0027] Furthermore, as shown in the appendix Figure 3 As shown, the stirring component 12 includes a stirring motor 121, a rotating shaft 122, and stirring blades 123. Specifically, the stirring motor 121 is located on the top of the first cover 114; the driving end of the stirring motor 121 is provided with a rotating shaft 122, which extends toward the interior of the stirring container 11 and is vertically arranged inside the stirring container 11; a plurality of stirring blades 123 are arranged around the periphery of the rotating shaft 122. Of course, the stirring blades 123 can be designed to be inclined, which can enhance the stirring effect of the stirring component 12. The relevant content can be generally referred to in the existing patent with publication number CN116212748A.

[0028] Furthermore, a bearing (not shown in the figure) is also provided in the stirring component 12; specifically, the bearing is rotatably connected to the rotating shaft 122, and the outer wall of the bearing is connected to the inner wall of the stirring container 11. This design can prevent the rotating shaft 122 from causing wear on the inner wall of the stirring container 11, and to a certain extent extend the service life of the red mud stirring mechanism 1.

[0029] Furthermore, as shown in the appendix Figure 3 As shown, there is a certain distance between the bottom end of the rotating shaft 122 and the bottom of the inner wall of the mixing container 11. This design can prevent the bottom end of the rotating shaft 122 from wearing down the bottom of the mixing container 11. Normally, the mixing container 11 has a first feed inlet 112 on the left side and a first discharge outlet 115 on the right side. In addition, the operator can set a feed trough 113 at the first feed inlet 112, which facilitates the addition of red mud and tap water into the mixing container 11. In addition, the operator can set a red mud slurry valve (not shown in the figure) at the first discharge outlet 115. After the mixing component 12 has been working for a certain period of time, the operator can operate the control unit to switch the working state of the red mud slurry valve to closed. At this time, the red mud slurry in the mixing chamber 111 can be transported to the spraying mechanism 3 through the red mud slurry valve and the first discharge outlet 115.

[0030] In a specific application scenario, as shown in the appendix Figure 1As shown, the pH adjustment mechanism 4 mainly includes a pH adjustment container 41 and a delivery pipeline 42. The pH adjustment container 41 has a pH adjustment chamber (not shown in the figure) inside. The delivery pipeline 42 is located on the upper side of the pH adjustment container 41, extending towards the interior of the pH adjustment container 41, with its bottom end located in the pH adjustment chamber. In use, operators can add the appropriate pH adjuster through the delivery pipeline 42 based on the real-time pH value displayed in the pH adjustment mechanism 4, thereby adjusting the received slurry to an alkaline state. This is existing technology, and the relevant details will not be elaborated upon. When the pH value of the alkaline slurry meets the required level, the alkaline slurry is delivered to the filtration mechanism 5. In addition, staff can install an alkaline slurry valve (not shown in the figure) at the outlet of the pH adjustment container 41. When the pH value of the alkaline slurry meets their needs, they can operate the control unit to switch the working state of the alkaline slurry valve to closed. At this time, the alkaline slurry in the pH adjustment chamber can be transported to the filter mechanism 5 through the alkaline slurry valve and the outlet of the pH adjustment container 41.

[0031] Furthermore, as shown in the appendix Figure 1 and appendix Figure 2 As shown, the pH adjustment mechanism 4 also includes a cover plate 43, which covers the top of the delivery pipeline 42. Normally, the bottom of the cover plate 43 has an annular protrusion (not shown in the figure) that fits the top of the delivery pipeline 42, allowing the cover plate 43 to be inserted into the pipeline 42. When the operator needs to add pH adjuster to the pH adjustment chamber, the cover plate 43 is removed; after adding the pH adjuster, the cover plate 43 is reinserted into the delivery pipeline 42. This design reduces the probability of foreign objects entering the pH adjustment chamber. Normally, the bottom of the spray container 31 has a second discharge port 316, which is connected to the pH adjustment container 41. In order to accurately adjust the pH value of the slurry, the operator can install a shut-off valve (not shown in the figure) at the second discharge port 316. When the operator is adjusting the pH value of the slurry, he can operate the control unit to switch the working state of the shut-off valve to open. At this time, the slurry in the spray container 31 cannot be transported to the pH adjustment container 41 through the shut-off valve and the second discharge port 316. When the slurry in the current pH adjustment container 41 meets its own needs and the slurry has been transported to the filter mechanism 5, the working state of the shut-off valve is switched to closed, so that the pH adjustment container 41 can receive the slurry transported from the spray container 31 again.

[0032] In a specific application scenario, as shown in the appendix Figure 1As shown, the filtration mechanism 5 mainly includes a filter tank 51 and a filter screen 52; wherein, the filter tank 51 is connected to the pH adjustment container 41; the filter screen 52 is provided on the inner wall of the filter tank 51, and there is a certain distance between the filter screen 52 and the bottom of the inner wall of the filter tank 51. This design facilitates the opening of a corresponding discharge port on the filter tank 51, thereby preventing the ferric hydroxide in the slurry from flowing out from the discharge port of the filter tank 51, and further reducing the degree of resource waste.

[0033] Typically, this embodiment also includes a water delivery pipe 7 and a gas guide pipe 6, as shown in the attached diagram. Figure 1 Appendix Figure 3 and appendix Figure 4 As shown; specifically, the top of the spray container 31 is provided with a second inlet 3121, and a first water pipe 71 is provided between the second inlet 3121 and the first outlet 115. The first water pipe 71 can connect the red mud stirring mechanism 1 and the spray container 31, and a first water pump 771 is provided on the first water pipe 71; a third water pipe 73 is provided between the second outlet 316 of the spray container 31 and the pH adjustment container 41, and the third water pipe 73 can connect the spray container 31 and the pH adjustment container 4. 1. A second water pump 772 is installed on the third water pipe 73; a fifth water pipe 75 is installed between the pH adjustment container 41 and the filter tank 51, and the fifth water pipe 75 can connect the pH adjustment container 41 and the filter tank 51. A fourth water pump 774 is installed on the fifth water pipe 75; a sixth water pipe 76 is installed at the outlet of the filter tank 51. This design facilitates the transportation of liquid in the filter tank 51 to other processing steps, which reduces the degree of environmental pollution of this embodiment to a certain extent.

[0034] Furthermore, as shown in the appendix Figure 1 and appendix Figure 4 As shown, a smoke inlet 313 is provided on the left side of the spray container 31. A first air pipe 61 is provided between the smoke inlet 313 and the exhaust port of the roasting furnace 2. The first air pipe 61 can connect the roasting furnace 2 and the spray container 31. A second exhaust port 315 is provided on the rear side of the spray container 31. A third air pipe 63 is provided at the second exhaust port 315. The aforementioned second air valve 34 is provided on the third air pipe 63.

[0035] Of course, staff can symmetrically install the first support 317 on both sides of the bottom of the spray container 31 and the second support 44 on both sides of the bottom of the pH adjustment container 41, as shown in the attached figure. Figure 1 As shown, this design enhances the overall structural stability of this embodiment and also facilitates the conveying of corresponding materials.

[0036] Additionally, as attached Figure 1 and appendix Figure 4As shown, during implementation, an additional spray container 35 can be installed. Specifically, a second air pipe 62 is installed between the additional spray container 35 and the spray container 31, and a first air valve 33 is installed on the second air pipe 62. Normally, a first exhaust port 314 is opened on the side of the spray container 31 near the additional spray container 35, and the second air pipe 62 is installed at the first exhaust port 314. A second water pipe 72 is installed between the top of the additional spray container 35 and the first water pipe 71, and a water valve is installed on the second water pipe 72. 32; Furthermore, the additional spray container 35 also has a spray chamber 311, a second cover 312, a second inlet 3121, an inner cavity 3122, a spray port 3123, a smoke inlet 313, a second exhaust port 315, a second outlet 316, a first support 317, a second air valve 34, and a sulfide concentration detector, etc. A fourth air pipe 64 is provided on one side of the additional spray container 35, and a fourth water pipe 74 is provided between the bottom of the additional spray container 35 and the pH adjustment mechanism 4. A third pump body is provided on the fourth water pipe 74. If the staff determines, based on the sulfide concentration sensor, that the flue gas in the spray container 31 has not met their needs for an extended period, they can operate the control unit to switch the first air valve 33 to closed. At this time, the second air pipe 62 guides the flue gas in the spray container 31 to the auxiliary spray container 35. Then, the water valve 32 is switched to closed, and the aforementioned red mud slurry can be transported to the interior of the auxiliary spray container 35 via the first water pipe 71 and the second water pipe 72. Next, the auxiliary spray container 35 sprays the received red mud slurry onto the flue gas transported by the spray container 31. After a period of time, if the flue gas meets the staff's needs, the control unit can be operated to adjust the working state of the second air valve 34 in the auxiliary spray container 35, thereby allowing the fourth air pipe 64 to guide the flue gas in the auxiliary spray container 35 to the external environment.

[0037] If the operator takes temperature into consideration, a flue gas cooling unit (not shown in the figure) can be set between the roasting furnace 2 and the spraying mechanism 3. This design can prevent high-temperature flue gas from affecting the corresponding structure of the spraying container 31. The operator can use high-temperature resistant materials to make the first gas pipe 61. This design can ensure the normal operation of this embodiment. In order to facilitate the maintenance of this embodiment, the operator can make the connection structure of adjacent components detachable. For example, the first cover 114 and the stirring chamber 111 can be made detachable. If the feed end of the first water pipe 71 is blocked, the operator can remove the first cover 114 from the top of the stirring chamber 111 to quickly clean the red mud solids accumulated at the feed end of the first water pipe 71. This design improves the efficiency of the operator in maintaining this embodiment.

[0038] Typically, the aforementioned control unit is electrically connected to components such as the stirring component 12, water valve 32, first air valve 33, second air valve 34, sulfide concentration sensor, pH adjustment mechanism 4, first water pump 771, second water pump 772, third water pump 773, fourth water pump 774, shut-off water valve, and flue gas cooling unit. This design facilitates the adjustment of the working status of the corresponding components in this embodiment at any time, thereby improving the efficiency of iron recovery from red mud to a certain extent.

[0039] Those skilled in the art will understand that, unless specifically stated otherwise, the singular forms “a,” “an,” and “the” used in this invention may also include the plural forms. It should be further understood that the term “comprising” as used in this invention means the presence of the stated features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. It should be understood that when we say an element is “connected” or “coupled” to another element, it can be directly connected or coupled to the other element, or there may be intermediate elements. Furthermore, “connected” or “coupled” as used herein can include wireless connections or wireless coupling. The term “and / or” as used herein includes all or any units and all combinations of one or more associated listed items.

Claims

1. A multi-stage resource utilization and flue gas desulfurization synergistic system for red mud, characterized in that, include: A red mud stirring mechanism (1) is used to prepare red mud slurry, and a stirring component (12) is provided in the red mud stirring mechanism (1). The spraying mechanism (3) is used to spray the red mud slurry onto the flue gas generated during the preparation of alumina in the external roasting furnace (2), and includes: The spray container (31) has a spray chamber (311) inside, and the spray chamber (311) is connected to the roasting furnace (2); The second cover (312) is disposed on the upper side of the spray chamber (311). The interior of the second cover (312) is provided with an inner cavity (3122), the bottom of the second cover (312) is provided with a spray port (3123), and the top of the second cover (312) is provided with a second feed port (3121). The second feed inlet (3121) is connected to the red mud stirring mechanism (1); The pH adjustment mechanism (4) is connected to the spray container (31); The filtration mechanism (5) is connected to the pH adjustment mechanism (4).

2. The multi-stage resource utilization and flue gas desulfurization synergistic system for red mud according to claim 1, characterized in that, The spraying mechanism (3) also includes: A sulfide concentration sensor is installed inside the spray chamber (311); The spray container (31) has a second exhaust port (315) on the side of its inner wall. The second air valve (34) is located at the second smoke exhaust port (315); in, When in use, staff can adjust the current working status of the second gas valve (34) based on the information detected by the sulfide concentration sensor.

3. The multi-stage resource utilization and flue gas desulfurization synergistic system for red mud according to claim 1, characterized in that, The red mud stirring mechanism (1) includes: Stirring container (11); The stirring container (11) is disposed on one side of the spraying mechanism (3), and the stirring container (11) is connected to the second feed inlet (3121); The stirring surface of the stirring component (12) is located inside the stirring container (11); in, The red mud slurry in the mixing container (11) can enter the spray chamber (311) through the second feed port (3121), the inner cavity (3122), and the spray port (3123).

4. The multi-stage resource utilization and flue gas desulfurization synergistic system for red mud according to claim 3, characterized in that, The stirring component (12) includes: A stirring motor (121) is disposed on the top of the stirring container (11); A rotating shaft (122) is vertically arranged inside the stirring container (11), and one end of the rotating shaft (122) is connected to the drive end of the stirring motor (121); A number of stirring blades (123) are arranged around the periphery of the rotating shaft (122).

5. The multi-stage resource utilization and flue gas desulfurization synergistic system for red mud according to claim 4, characterized in that, The stirring component (12) further includes: Bearings; The bearing is rotatably connected to the rotating shaft (122), and the outer wall of the bearing is connected to the inner wall of the stirring container (11).

6. The multi-stage resource utilization and flue gas desulfurization synergistic system for red mud according to claim 4 or claim 5, characterized in that, There is a certain distance between the other end of the rotating shaft (122) and the bottom of the inner wall of the stirring container (11).

7. The multi-stage resource utilization and flue gas desulfurization synergistic system for red mud according to claim 6, characterized in that, A feed chute (113) is provided on one side of the mixing container (11).

8. The multi-stage resource utilization and flue gas desulfurization synergistic system for red mud according to any one of claims 1-5 or 7, characterized in that, The pH adjustment mechanism (4) includes: pH adjustment container (41); The delivery pipe (42) has one end located on the upper side of the pH adjustment container (41) and extends toward the interior of the pH adjustment container (41).

9. The multi-stage resource utilization and flue gas desulfurization synergistic system for red mud according to claim 8, characterized in that, The pH adjustment mechanism (4) also includes: A cover plate (43) is provided on one end of the conveying pipeline (42).

10. The multi-stage resource utilization and flue gas desulfurization synergistic system for red mud according to claim 8, characterized in that, The filtration mechanism (5) includes: The filter tank (51) is connected to the pH adjustment container (41); The filter screen (52) is connected to the inner wall of the filter tank (51) on its side, and there is a certain distance between the filter screen (52) and the bottom of the inner wall of the filter tank (51).

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