Flat disc filter and decomposition tank scab circulating recovery system

Abstract

The utility model discloses a kind of flat disc filter and decomposition groove scab recycling system, belong to the technical field of alumina production.The flat disc filter mainly includes installation base body, connecting pipeline and liquid collecting device.Among them, the top of the installation base body is provided with barrel-shaped casing;Discharge passage is opened in the bottom of the barrel-shaped casing;Auxiliary rotating mechanism is provided on the barrel-shaped casing;Filter disc is provided on the auxiliary rotating mechanism;Filter cloth is provided on the filter disc;Blanking mechanism, first flushing piece, screw conveying mechanism are provided on the filter cloth;Liquid collecting device is communicated with discharge passage by connecting pipeline;The liquid collecting device is also communicated with vacuum extraction equipment, to improve the filtering efficiency.Decomposition groove scab recycling system is used for recycling scab generated in decomposition groove inner wall.

Description

Technical Field

[0001] This utility model relates to the field of alumina production technology, and in particular to a flat plate filter and a decomposition tank scale recycling system. Background Technology

[0002] In the Bayer process for alumina production, the inner wall of the decomposition tank often forms scale due to the deposition of aluminum hydroxide crystals. This scale may reduce the heat transfer efficiency of the decomposition tank and increase the energy consumption of stirring. If the scale is removed and discarded directly, it may result in a waste of resources because the scale still contains a certain amount of aluminum.

[0003] The decomposition tank scale recycling system generally employs the following steps: First, the mother liquor and the removed scale from the decomposition tank are fed into a ball mill; then, the mother liquor and scale are ground together in the ball mill to form a mixed slurry; next, the mixed slurry is transported to a plate and frame filter press via a slurry tank; then, the plate and frame filter press performs solid-liquid separation on the received mixed slurry, collecting the solids; finally, the solids are fed into a calcining furnace, ultimately completing the alumina preparation operation. However, the filtration efficiency of the existing plate and frame filter press is relatively low, and continuous filtration cannot be achieved. Utility Model Content

[0004] To address the shortcomings of existing technologies, the flat disc filter provided by this invention mainly includes a mounting base, an auxiliary rotating mechanism, a barrel-shaped shell, a filter disc, a feeding mechanism, a first flushing component, a screw conveying mechanism, connecting pipes, and a liquid collection device. During use, under the action of a vacuum extraction device, a negative pressure is created in the area enclosed by the filter disc and the barrel-shaped shell, accelerating the passage of liquid particles from the mixed slurry through the filter cloth. This design improves the speed of solid-liquid separation, thus increasing filtration efficiency. Simultaneously, this design also enables continuous filtration. Compared to existing technologies, this invention improves filtration efficiency and therefore has high practicality.

[0005] To achieve the above objectives, this utility model provides the following technical solution: Flat disc filter, including: Mounting substrate; A barrel-shaped shell is disposed at the top of the mounting base; a discharge channel is provided at the bottom of the barrel-shaped shell; An auxiliary rotation mechanism is located at the center of the bottom inner side of the barrel-shaped shell; the axial rotation center of the drive end of the auxiliary rotation mechanism coincides with the axial center of the barrel-shaped shell and faces the open top surface of the barrel-shaped shell. A filter disc is disposed at the drive end of the auxiliary rotating mechanism; the diameter of the filter disc is adapted to the inner diameter of the barrel-shaped shell, and its lower surface is flush with or lower than the open top surface of the barrel-shaped shell; a filter cloth is provided on the upper surface of the filter disc to trap solids in the mixed slurry; the upper surface of the filter cloth is flush with or higher than the open top surface of the barrel-shaped shell; along the direction of rotation of the filter disc during its operation, a feeding mechanism, a first rinsing component, and a screw conveying mechanism are sequentially provided on the filter cloth; The liquid collection device is connected to the discharge channel via a connecting pipeline; the liquid collection device is also connected to a vacuum extraction device, thereby creating a negative pressure in the area surrounded by the filter disc and the barrel-shaped shell, accelerating the passage of liquid in the mixed slurry through the filter cloth, and realizing solid-liquid separation.

[0006] Furthermore, the liquid collection device includes: a buffer tank and a liquid collection container; One side of the buffer box is connected to the discharge channel, and the other side of the buffer box is connected to one end of the connecting pipe; The liquid collection container is connected to the other end of the connecting pipeline, and the liquid collection container is also connected to the vacuum extraction device.

[0007] Furthermore, the screw conveyor mechanism includes: A rotary motor is disposed on one side of the mounting base; The second rotating shaft has one end connected to the drive end of the rotary motor, and the second rotating shaft extends towards the center of the filter disc along the radial direction of the filter disc. The spiral fan blades, in a number, are arranged around the outer peripheral wall of the second rotating shaft. Their spiral direction must be sufficient to transport the solid material trapped on the filter cloth to the outside of the barrel-shaped shell along the radial direction of the filter disc.

[0008] Furthermore, the spiral conveying mechanism also includes: an arc-shaped abutment; The arc-shaped support member is disposed near the second rotating shaft along the length direction of the second rotating shaft; the arc-shaped recessed area of ​​the arc-shaped support member is opposite to the rotation direction of the filter disc, and its arc-shaped lower edge contacts the filter cloth; The spiral fan blades are located within the arc-shaped recessed area of ​​the arc-shaped support member; The solids trapped on the filter cloth are separated by the arc-shaped abutment and then conveyed to the outside of the barrel-shaped shell by the spiral fan blades.

[0009] Furthermore, the spiral conveying mechanism further includes: a cover; the cover is disposed on the upper side of the spiral fan blade, and the side of the cover is connected to the arc-shaped support member.

[0010] Furthermore, the screw conveyor mechanism also includes: a solid transfer housing; The solid material transfer housing is disposed between the mounting base and the rotary motor. The inlet at the top of the housing is used to receive solid materials that are spirally conveyed to the outside of the barrel-shaped housing by the spiral fan blades. The outlet at the bottom of the solid material transfer housing is provided.

[0011] Based on the same inventive concept, this utility model also discloses a decomposition tank scale recycling system. The decomposition tank scale recycling system includes: A ball mill is used to receive the scale and mother liquor removed from the inner wall of the decomposition tank, and grind the received scale and mother liquor into a mixed slurry. A slurry tank is used for temporary storage of the mixed slurry produced by the ball mill. The aforementioned flat plate filter; the flat plate filter is used to receive the mixed slurry conveyed from the slurry tank, and to perform solid-liquid separation on the received mixed slurry to remove solids; A calcining furnace is used to receive the solid material intercepted by the flat plate filter and calcine the received solid material to produce alumina.

[0012] Furthermore, the decomposition tank scale recycling system also includes a belt conveyor unit; the belt conveyor unit is located between the flat plate filter and the roasting furnace, and conveys the solid material intercepted by the flat plate filter to the roasting furnace.

[0013] Furthermore, the decomposition tank scale recycling system also includes a spiral conveying unit; the spiral conveying unit is located between the flat plate filter and the roasting furnace, and spirally conveys the solids intercepted by the flat plate filter into the roasting furnace.

[0014] Furthermore, the ball mill is provided with a first pipe at the feed end, and a first pump body is provided on the first pipe; And / or, a second pipe is provided between the ball mill and the slurry tank, and a second pump body is provided on the second pipe; And / or, a third pipe is provided between the slurry tank and the flat plate filter, and a third pump body is provided on the third pipe.

[0015] The beneficial effects of this utility model are: 1. The flat disc filter provided by this utility model is equipped with a barrel-shaped shell and a filter disc. Under the action of the vacuum extraction equipment, the area surrounded by the filter disc and the barrel-shaped shell can form a negative pressure, which accelerates the liquid in the mixed slurry to pass through the filter cloth. This design improves the speed of solid-liquid separation, that is, improves the filtration efficiency; at the same time, this design can also achieve the purpose of continuous filtration.

[0016] 2. The flat plate filter is equipped with connecting pipes and a liquid collection device. Under the negative pressure mentioned above, the liquid can move quickly through the filter cloth, filter plate, barrel-shaped shell, and connecting pipes to the liquid collection device. This design increases the speed at which the liquid on the filter plate moves to the liquid collection device and avoids excessive liquid accumulation inside the barrel-shaped shell for a long time, which would affect the solid-liquid separation effect. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the flat disc filter of this utility model; Figure 2 This utility model Figure 1 The structural diagram excluding the roasting furnace, belt conveyor unit, arc-shaped support, and cover is shown in the image. Figure 1 Another perspective); Figure 3 This utility model Figure 2 Another perspective; Figure 4 This is a schematic diagram showing the disassembly structure of the mounting base and filter disc of this utility model; Figure 5 This is a partial assembly structure diagram of the solid material conveying component, the arc-shaped support component, and the cover of this utility model. Figure 6 This is a schematic diagram of the assembly structure of the belt conveyor unit and the roasting furnace of this utility model in a specific application scenario. Figure 7 This is a schematic diagram of the overall principle of the decomposition tank scale recycling system of this utility model; Figure 8 This is a schematic diagram of the decomposition tank scale recycling system of this utility model in a specific application scenario; Figure 9 This is a schematic diagram of the decomposition tank scale recycling system of this utility model in another specific application scenario.

[0018] Figure label: 1. Decomposition tank; 2. Ball mill; 3. Slurry tank; 4. Calcination furnace; 41. Solid material inlet; 42. Exhaust pipe; 5. Mounting base; 51. Barrel-shaped shell; 52. Heat dissipation channel; 53. Exhaust channel; 6. Auxiliary rotating mechanism; 61. First rotating shaft; 62. Isolation sleeve; 7. Filter tray; 8. Feeding mechanism; 81. Feeding housing; 82. Feeding pipeline; 91. First flushing component; 92. Second flushing component; 10. Screw conveyor mechanism; 101. Column; 102. Solid material conveying component; 1021. Rotary motor; 1022. Second rotating shaft; 1023. Screw blade; 1024. Bearing; 103. Solid material transfer housing; 104. Mounting base; 105. Connecting plate; 106. Arc-shaped support; 107. Cover; 11. Fixing components; 111. L-shaped fasteners; 112. Connecting components; 12. Liquid collection device; 121. Buffer tank; 122. Liquid collection container; 13. Belt conveyor unit; 131. Mounting base; 132. Belt drive motor; 133. First fixing block; 134. Second fixing block; 135. Third fixing block; 136. Belt; 137. Notch; 138. Support plate; 14. Connecting pipes; 15. Screw conveyor unit. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. Here, the illustrative embodiments and descriptions of this utility model are used to explain the present utility model, but are not intended to limit the present utility model.

[0020] As attached Figure 1-9As shown, this embodiment discloses a flat-plate filter for improving filtration efficiency, mainly including a mounting base 5, an auxiliary rotating mechanism 6, a barrel-shaped shell 51, a filter disc 7, a feeding mechanism 8, a first flushing component 91, a screw conveying mechanism 10, a connecting pipe 14, and a liquid collection device 12. The mounting base 5 has a barrel-shaped shell 51 at its top, and a discharge channel 53 at its bottom. An auxiliary rotating mechanism 6 is located at the center of the bottom inner side of the barrel-shaped shell 51. A filter disc 7 is located at the drive end of the auxiliary rotating mechanism 6, and the diameter of the filter disc 7 is adapted to the inner diameter of the barrel-shaped shell 51. A filter cloth (not shown) is provided on the upper surface of the filter disc 7 to trap solids in the mixed slurry. Furthermore, along the direction of rotation of the filter disc 7 during operation, the filter cloth is sequentially provided with the feeding mechanism 8, the first flushing component 91, and the screw conveying mechanism 10. The liquid collection device 12 is connected to the discharge channel 53 via the connecting pipe 14. The filter plate 12 is also connected to a vacuum extraction device (not shown in the figure), which creates a negative pressure in the area surrounded by the filter plate 7 and the barrel-shaped shell 51, accelerating the passage of liquid in the mixed slurry through the filter cloth. This design improves the speed of solid-liquid separation, i.e., improves the filtration efficiency. At the same time, this design can also achieve the purpose of continuous filtration. Under the action of the negative pressure, the liquid can move quickly through the filter cloth, filter plate 7, barrel-shaped shell 51, and connecting pipe 14 to the liquid collection device 12. This design increases the speed at which the liquid on the filter plate 7 moves to the liquid collection device 12, and avoids excessive accumulation of liquid inside the barrel-shaped shell 51 for a long time, which would affect the solid-liquid separation effect.

[0021] In use, the operator first connects this embodiment to an external power source (not shown in the figure), connects the first flushing component 91 to an external water source (not shown in the figure), and connects the liquid collection device 12 to a vacuum extraction device; then, by operating a control panel (not shown in the figure), the mixed slurry in the slurry tank 3 is introduced into the feeding mechanism 8; next, the feeding mechanism 8 guides the received mixed slurry onto the filter cloth; simultaneously, the auxiliary rotating mechanism 6 drives the filter disc 7 to rotate, and the filter cloth on the filter disc 7 moves synchronously with the filter disc 7. The outer peripheral wall of the filter disc 7 slides in contact with the inner peripheral wall of the barrel-shaped shell 51. This design allows outside air to enter the lower side of the filter disc 7 only through the pores of the filter cloth and the pores of the filter disc 7, which to a certain extent increases the speed at which the liquid on the filter disc 7 moves to the liquid collection device 12; then, The filter disc 7 can carry the mixed slurry to the working end of the first rinsing member 91, where the first rinsing member 91 will perform the corresponding washing operation. Normally, the holes on the filter disc 7 correspond one-to-one with the holes on the filter cloth. During this process, the vacuum extraction device can create a negative pressure in the area surrounded by the filter disc 7 and the barrel-shaped shell 51, accelerating the passage of liquid in the mixed slurry through the filter cloth. This design improves the speed of solid-liquid separation, thus increasing the filtration efficiency. At the same time, this design can also achieve continuous filtration. Then, the filter cloth will carry the trapped solids to the working end of the screw conveyor mechanism 10, which can transport the solids to the solid feed inlet 41 of the calcining furnace 4. Next, the solids enter the interior of the calcining furnace 4, where the calcining furnace 4 can calcine the solids to produce alumina. Furthermore, under the aforementioned negative pressure, the liquid can move rapidly through the filter cloth, filter plate 7, barrel-shaped shell 51, and connecting pipe 14 to the liquid collection device 12. This design increases the speed at which the liquid on the filter plate 7 moves to the liquid collection device 12, and avoids excessive liquid accumulation inside the barrel-shaped shell 51 for a long time, which would affect the solid-liquid separation effect of this embodiment.

[0022] Existing technologies using plate and frame filters typically require frequent loading and unloading of the plates and frames, making continuous filtration impossible and resulting in generally low filtration efficiency. This embodiment, however, employs a flat-plate filter. Under the influence of a vacuum extraction device, a negative pressure is created in the area enclosed by the filter disc 7 and the cylindrical shell 51, accelerating the passage of liquid from the mixed slurry through the filter cloth. This design improves the speed of solid-liquid separation, thus increasing filtration efficiency. Furthermore, this design also enables continuous filtration.

[0023] The specific structure of the flat disc filter is as follows: it includes a mounting base 5; a barrel-shaped shell 51 is provided at the top of the mounting base 5; a discharge channel 53 is provided at the bottom of the barrel-shaped shell 51; an auxiliary rotating mechanism 6 is provided at the center of the bottom inner side of the barrel-shaped shell 51; the axial rotation center of the drive end of the auxiliary rotating mechanism 6 coincides with the axial center of the barrel-shaped shell 51 and faces the open top surface of the barrel-shaped shell 51; a filter disc 7 is provided at the drive end of the auxiliary rotating mechanism 6; the diameter of the filter disc 7 is adapted to the inner diameter of the barrel-shaped shell 51, and its lower surface is flush with or lower than the open top surface of the barrel-shaped shell 51. The filter disc 7 has an open top surface; the upper surface of the filter disc 7 is provided with filter cloth to trap solids in the mixed slurry; the upper surface of the filter cloth is flush with or higher than the open top surface of the barrel-shaped shell 51; along the direction of rotation of the filter disc 7 during operation, the filter cloth is sequentially provided with a feeding mechanism 8, a first flushing component 91, and a screw conveying mechanism 10; the liquid collection device 12 is connected to the discharge channel 53 through a connecting pipe 14; the liquid collection device 12 is also connected to a vacuum extraction device, thereby creating a negative pressure in the area surrounded by the filter disc 7 and the barrel-shaped shell 51, accelerating the passage of liquids in the mixed slurry through the filter cloth, and achieving solid-liquid separation. Compared with the prior art, this utility model improves the filtration efficiency and therefore has high practicality.

[0024] In a specific application scenario, as shown in the appendix Figure 1 As shown, the liquid collection device 12 mainly includes a buffer tank 121 and a liquid collection container 122. One side of the buffer tank 121 is connected to the discharge channel 53, and the other side of the buffer tank 121 is connected to one end of the connecting pipe 14. The other end of the connecting pipe 14 is connected to the liquid collection container 122, and the upper side of the liquid collection container 122 is connected to a vacuum extraction device. This design allows the liquid to move stably into the interior of the liquid collection container 122, reducing the impact force of the liquid on the inner wall of the liquid collection container 122 to a certain extent.

[0025] Furthermore, as shown in the appendix Figure 2As shown, the screw conveying mechanism 10 is provided with a solid material conveying component 102, which includes a rotary motor 1021, a second rotating shaft 1022, and a spiral fan blade 1023. Specifically, the rotary motor 1021 is located on one side of the mounting base 5. The drive end of the rotary motor 1021 is provided with a second rotating shaft 1022, which extends towards the center of the filter disc 7 along the radial direction. The outer peripheral wall of the second rotating shaft 1022 is surrounded by a plurality of spiral fan blades 1023, the spiral direction of which must be sufficient to convey the solid material trapped on the filter cloth to the outside of the barrel-shaped shell 51 along the radial direction of the filter disc 7. In use, the rotary motor 1021 drives the second rotating shaft 1022 to rotate, and the second rotating shaft 1022 moves synchronously with the spiral fan blade 1023. During this process, the solid material that moves to the bottom of the second rotating shaft 1022 can be spirally transported to the outside of the filter plate 7 by the spiral fan blade 1023. This design provides the prerequisite for the roasting furnace 4 to receive the solid material.

[0026] Furthermore, as shown in the appendix Figure 2 and appendix Figure 5 As shown, the screw conveyor mechanism 10 also includes a mounting base 104, a connecting plate 105, and an arc-shaped abutment 106. Specifically, the mounting base 104 is located on the side of the rotary motor 1021 away from the first flushing member 91. A connecting plate 105 is provided on one side of the mounting base 104, extending towards the center of the filter disc 7 along the radial direction of the filter disc 7. An arc-shaped abutment 106 is provided on the side of the connecting plate 105 along its length, and the arc-shaped abutment 106 extends along the length of the second rotating shaft 1022. The direction is set near the second rotating shaft 1022; the arc-shaped recessed area of ​​the arc-shaped support 106 is opposite to the rotation direction of the filter disc 7, and the lower arc edge of the arc-shaped support 106 contacts the filter cloth; the aforementioned spiral fan blade 1023 is located within the arc-shaped recessed area of ​​the arc-shaped support 106; the solids trapped on the filter cloth are separated by the arc-shaped support 106 and then spirally conveyed to the outside of the barrel-shaped shell 51 by the spiral fan blade 1023. This design improves the interception effect of solids in this embodiment. Normally, a column 101 is vertically arranged on one side of the mounting base 5. The top of the column 101 is spaced apart from the rotating motor 1021 and the mounting base 104. The height of the top of the column 101 is equal to the height of the top of the barrel-shaped shell 51. This design facilitates the installation of the solid conveying component 102.

[0027] Furthermore, as shown in the appendix Figure 5As shown, the spiral conveying mechanism 10 is also provided with a cover 107; specifically, the cover 107 is provided on the upper side of the spiral fan blade 1023, and the side of the cover 107 is connected to the arc-shaped support member 106. This design can avoid the following situation: when the spiral fan blade 1023 carries solid objects, some solid objects may splash onto the connecting plate 105, which reduces the effect of recycling and collecting scale to a certain extent.

[0028] Furthermore, as shown in the appendix Figure 1 As shown, the screw conveyor mechanism 10 also includes a solid material transfer housing 103. Specifically, the solid material transfer housing 103 is disposed between the mounting base 5 and the rotary motor 1021. The feed inlet at the top of the solid material transfer housing 103 is used to receive solid materials that are spirally conveyed to the outside of the barrel-shaped housing 51 by the screw fan blades 1023. The lower part of the solid material transfer housing 103 has a discharge port. Normally, the top of the roasting furnace 4 has a solid material feed inlet 41, which is connected to the discharge port of the solid material transfer housing 103. This design facilitates the guidance of the solid materials intercepted in this embodiment into the interior of the roasting furnace 4.

[0029] Furthermore, as shown in the appendix Figure 3 As shown, the screw conveyor mechanism 10 is also provided with a bearing 1024; specifically, the bearing 1024 is rotatably connected to the second rotating shaft 1022. The bearing 1024 is located on the side of the solid transfer housing 103 near the rotary motor 1021. This design enhances the overall structural stability of the screw conveyor mechanism 10 during operation.

[0030] This embodiment takes into account some situations, and the specific solution is as follows: A second rinsing member 92 is provided between the first rinsing member 91 and the screw conveying mechanism 10. This design improves the washing effect of this embodiment. Normally, both the first rinsing member 91 and the second rinsing member 92 are provided with a water inlet on one side (not marked in the figure). This design facilitates the introduction of external water sources into the first rinsing member 91 and the second rinsing member 92. A fixing member 11 is provided on the side of the mounting base 5. This fixing member 11 has three L-shaped fixing parts 111: the first is located between the feeding mechanism 8 and the first flushing member 91; the second is located between the first flushing member 91 and the second flushing member 92; and the third is located between the second flushing member 92 and the screw conveyor mechanism 10. Furthermore, a connecting part 112 passes through these three L-shaped fixing parts 111. One end of the connecting part 112 is connected to the side of the connecting plate 105 away from the screw fan blade 1023. The connecting part 112 passes sequentially through the feeding mechanism 8, the first L-shaped fixing part 111, the first flushing member 91, the second L-shaped fixing part 111, and the second flushing member 92. The other end of the connecting part 112 is connected to the inner wall of the third L-shaped fixing part 111, as shown in the attached diagram. Figure 1 and appendix Figure 2As shown, this design improves the overall structural stability of this embodiment. (See attached diagram) Figure 1 and appendix Figure 4 As shown, the aforementioned auxiliary rotating mechanism 6 includes a drive motor (not shown in the figure). The drive end of the drive motor has a first rotating shaft 61, the top of which is connected to the middle of the bottom of the filter disc 7. An isolation sleeve 62 is fitted over the outer side of the drive motor, and a portion of the outer side of the first rotating shaft 61 is also fitted with an isolation sleeve 62. This design prevents liquid from moving to the drive motor and thus affecting the normal operation of this embodiment. (See attached...) Figure 2 and appendix Figure 3 As shown, the feeding mechanism 8 is provided with a feeding housing 81. The top of the feeding housing 81 is open, and the bottom of the inner side of the feeding housing 81 is provided with a discharge port (not marked in the figure). The lower side of the discharge port is connected to two feeding pipes 82. In use, after the mixed slurry in the slurry tank 3 is transported to the feeding housing 81, the mixed slurry is guided to the filter cloth by the two feeding pipes 82. A belt conveyor unit 13 is provided on one side of the discharge port of the solid transfer housing 103, as shown in the attached diagram. Figure 1 and appendix Figure 6As shown; specifically, the belt conveyor unit 13 is provided with a mounting base 131, and a belt drive motor 132 is provided at the top of the mounting base 131 and on the side near the solid transfer housing 103; the drive end of the belt drive motor 132 is provided with a drive roller (not shown in the figure), and a first fixing block 133 is rotatably provided at one end of the drive roller; a second fixing block 134 and a third fixing block 135 are provided at the top of the mounting base 131 and on the side away from the belt drive motor 132, the second fixing block 134 and the third fixing block 135 are arranged opposite each other, and a transmission roller (not shown in the figure) is rotatably provided between the second fixing block 134 and the third fixing block 135; a belt 136 is sleeved on the transmission roller and the drive roller; the mounting base 1 A calcining furnace 4 is located at one end away from the solid transfer housing 103. The solid feed inlet 41 of the calcining furnace 4 is located below the end of the mounting base 131. In use, the solid material falls from the discharge port of the solid transfer housing 103 onto the belt 136. Then, the belt drive motor 132 drives the drive roller to rotate, and the belt 136 begins to move the solid material toward the calcining furnace 4. During this process, the transmission roller moves synchronously with the drive roller. When the solid material moves to the transmission roller, it will be affected by gravity and gradually move away from the belt 136, eventually falling into the interior of the calcining furnace 4 from the solid feed inlet 41. The calcining furnace 4 is equipped with a flue gas pipe 42, which facilitates the discharge of the flue gas generated during the alumina preparation process in the calcining furnace 4. Of course, in the specific implementation, the staff can set a guide sloping block (not shown in the figure) at the discharge port of the solid material transfer housing 103. The guide sloping block extends toward the belt 136, and the thickness of the guide sloping block on the side near the solid material transfer housing 103 is greater than the thickness of the guide sloping block on the side near the belt conveyor unit 13. This design allows the solid material in the solid material transfer housing 103 to fall onto the belt 136 more smoothly. As attached Figure 6 As shown, a notch 137 is made at one end of the mounting base 131 near the roasting furnace 4. This notch 137 is located directly above the solid material inlet 41 and directly below the drive roller. A support plate 138 is provided on the lower side of the belt 136. The bottom end of the support plate 138 is connected to the top end of the mounting base 131, and the supporting end of the support plate 138 contacts the conveying surface of the belt 136. The support plate 138 is positioned close to the notch 137, and its length is equal to the width of the belt 136. This design prevents some solid material from adhering to the belt 136 for extended periods. (See attached diagram) Figure 1 As shown, a heat dissipation channel 52 is opened on the right side of the mounting base 5, and the heat dissipation channel 52 extends to the bottom of the aforementioned drive motor. This design facilitates the dissipation of heat generated when the drive motor is working. Of course, in specific implementation, the aforementioned belt conveyor unit 13 can be replaced with a screw conveyor unit 15. The inlet of the screw conveyor unit 15 is connected to the outlet of the solid transfer housing 103, and the outlet of the screw conveyor unit 15 is connected to the solid feed inlet 41 of the roasting furnace 4. The specific structure of the screw conveyor unit 15 can be generally referred to the existing patent with publication number CN117049083A, and the relevant content will not be elaborated here.

[0031] Typically, the top of the liquid collection container 122 is equipped with an air tube (not marked in the figure), as shown in the attached diagram. Figure 3 As shown; and the other end of the duct is connected to a vacuum extraction device, which can be a vacuum pump or other equipment, as long as it can extract the air inside the liquid collection container 122.

[0032] In addition, to embody the concept of recycling, the staff can disassemble the aforementioned liquid collection container 122 from the external vacuum extraction equipment and then introduce the collected liquid into a falling film evaporator (not shown in the figure). The staff can perform the corresponding evaporation treatment on the liquid according to the corresponding button prompts on the falling film evaporator. When the caustic alkali concentration in the liquid is 140g / L-150g / L, the corresponding evaporation operation is stopped. The substance obtained is a mother liquor. This mother liquor can improve the alumina dissolution rate in gibbsite to a certain extent. This is existing technology, and the relevant details will not be elaborated further.

[0033] This embodiment also discloses a decomposition tank scale recycling system for recycling scale generated on the inner wall of the decomposition tank 1, as shown in the attached figure. Figure 7-9 As shown, the system mainly includes a ball mill 2, a slurry tank 3, the aforementioned flat plate filter, and a calcining furnace 4. The ball mill 2 is connected to the decomposition tank 1 and is used to receive the scale and mother liquor scraped from the inner wall of the decomposition tank 1, grinding the received scale and mother liquor into a mixed slurry. The ball mill 2 is connected to the slurry tank 3, which is used to temporarily store the mixed slurry produced by the ball mill 2. The slurry tank 3 is connected to the flat plate filter, which is used to receive the mixed slurry transported from the slurry tank 3 and perform solid-liquid separation on the received mixed slurry to extract solids. The flat plate filter is connected to the calcining furnace 4, which is used to receive the solids extracted by the flat plate filter and calcinate the received solids to produce alumina.

[0034] The following technical solutions can typically be used by the operator: A first pipe (not shown in the figure) is installed at the feed end of the ball mill 2. This first pipe connects the decomposition tank 1 and the ball mill 2, and a first pump body (not shown in the figure) is installed on this first pipe. This design facilitates the operator to transport the mother liquor from the decomposition tank 1 to the ball mill 2. A second pipe (not shown in the figure) is installed between the ball mill 2 and the slurry tank 3. A second pump body (not shown in the figure) is installed on this second pipe. This design facilitates the operator to transport the mixed slurry formed by grinding in the ball mill 2 to the slurry tank 3. A third pipe is installed between the slurry tank 3 and the flat plate filter. (Not shown in the figure) One end of the third pipe is located directly above the feed housing 81. A third pump body (not shown in the figure) is installed on the third pipe. This design facilitates the delivery of the mixed slurry in the slurry tank 3 to the flat plate filter, reducing the workload of the workers to some extent. Of course, the workers can also place the feed end of the third pipe close to the bottom of the slurry tank 3. This design can quickly deliver the solids in the mixed slurry to the flat plate filter, reducing the workload of the flat plate filter to some extent. The remaining liquid in the slurry tank 3 can be delivered to the falling film evaporator for the preparation of seed mother liquor.

[0035] In operation, firstly, remove the scale from the decomposition tank 1 and pour the corresponding scale into the ball mill 2; then, operate the control panel to start the first pump, which transports the mother liquor from the decomposition tank 1 to the ball mill 2 through the first pipe; next, the ball mill 2 grinds the mother liquor and scale into a mixed slurry; then, start the second pump, and the second pipe transports the mixed slurry to the slurry tank 3 for temporary storage; then, start the third pump, and the third pipe transports the slurry from the slurry tank 3 to the feeding mechanism 8 in the flat plate filter; of course, the operator can let the mixed slurry stand in the slurry tank 3 for a period of time before transporting the lower layer of mixed slurry to the feeding mechanism 8; because the solids in the mixed slurry will accumulate at the bottom of the slurry tank 3 under the action of gravity, at this time, placing the feed end of the third pipe near the bottom of the slurry tank 3 can quickly transport the solids in the mixed slurry to the feeding mechanism 8; in this process, other liquids will also be transported to the feeding mechanism. 8. However, this design avoids all the mixed slurry in the slurry tank 3 being transported to the feeding mechanism 8. This shortens the solid material interception time in this embodiment and reduces the workload of the flat plate filter to a certain extent. Normally, the operator can set the solid material inlet 41 below the outlet of the solid material transfer shell 103, that is, the solid material intercepted by the flat plate filter will fall directly into the interior of the calcining furnace 4 from the solid material inlet 41. At this time, the calcining furnace 4 can perform alumina preparation operations. Of course, the operator can also use a storage container (not shown in the figure). Specifically, first place the storage container below the outlet of the solid material transfer shell 103, so that the intercepted solid material falls into the interior of the storage container. After a period of time, replace the current storage container with another storage container. Then, pour the solid material in the replaced storage container into the calcining furnace 4. The corresponding principle block diagram can be roughly referred to in the attached figure. Figure 7 The content.

[0036] In a specific application scenario, a belt conveyor unit 13 can be installed between the calcining furnace 4 and the flat plate filter. This belt conveyor unit 13 can transport the solid material intercepted by the aforementioned flat plate filter into the calcining furnace 4, as shown in the attached diagram. Figure 8 As shown.

[0037] In another specific application scenario, the worker can replace the belt conveyor unit 13 with the screw conveyor unit 15, as shown in the attached figure. Figure 9 As shown, the spiral conveying unit 15 is located between the aforementioned flat plate filter and the calcining furnace 4. This spiral conveying unit 15 can convey the solid material collected by the aforementioned flat plate filter into the calcining furnace 4. In actual use, operators can choose the appropriate technical solution according to their needs; the corresponding details will not be elaborated upon.

[0038] Of course, a camera (not shown in the figure) can be installed at the top of the decomposition tank 1. This camera can periodically capture images of the scale buildup inside the decomposition tank 1 and send the data to an external server (not shown in the figure). The server can then send the received data to a control panel, where the screen displays the corresponding images for the operator to view. During the operation of the decomposition tank 1, the scale buildup on its inner wall gradually increases in size. If the particle size of most scale buildup is equal to 200mm, a portion of the scale structure will be exposed in the mother liquor. The camera can capture images of the current scale buildup inside the decomposition tank 1 and send the data to the control panel via the server. After seeing the information, the operator can remove the scale buildup. This design ensures that the scale particle size received by the ball mill 2 is less than or equal to 200mm, thus reducing the workload of the ball mill 2. Of course, if the operator feels that the scale buildup... Since the alumina particles are relatively large, they can be first crushed in an external jaw crusher (not shown in the figure). After the particle size of the alumina is reduced, it can be fed into the ball mill 2. The ball mill 2 can grind the received alumina and mother liquor. In addition, after the ball mill 2 grinds the received alumina and mother liquor, the particle size of the solid material conveyed to the slurry tank 3 is less than or equal to 0.18 mm. That is, the solid material discharged from the outlet of the ball mill 2 can pass through the 80-mesh screen, which improves the production quality of alumina to a certain extent.

[0039] Typically, the aforementioned control panel is electrically connected to components such as the ball mill 2, calcining furnace 4, first pump body, second pump body, third pump body, falling film evaporator, drive motor, rotary motor 1021, belt drive motor 132, vacuum pump, and server. This design facilitates the adjustment of the working status of the corresponding components by the staff at any time. In specific implementation, the staff can adopt, but is not limited to, the following technical solutions by assessing external environmental factors: setting an acid and alkali resistant layer on the outer wall of the camera, using high-temperature resistant materials to prepare the part of the belt conveyor unit 13 near the calcining furnace 4, and using high-temperature resistant materials to prepare the part of the spiral conveyor unit 15 near the calcining furnace 4.

[0040] The above description is merely an optional embodiment of this utility model and is not intended to limit the utility model. For those skilled in the art, various modifications and variations can be made to the embodiments of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A flat disc filter, characterized in that, include: Mounting base (5); A barrel-shaped shell (51) is disposed at the top of the mounting base (5); a discharge channel (53) is provided at the bottom of the barrel-shaped shell (51). An auxiliary rotating mechanism (6) is located at the center of the bottom inner side of the barrel-shaped housing (51); the axial rotation center of the driving end of the auxiliary rotating mechanism (6) coincides with the axial center of the barrel-shaped housing (51) and faces the open top surface of the barrel-shaped housing (51). A filter disc (7) is disposed at the drive end of the auxiliary rotating mechanism (6); the diameter of the filter disc (7) is adapted to the inner diameter of the barrel-shaped shell (51), and its lower surface is flush with or lower than the open top surface of the barrel-shaped shell (51); a filter cloth is provided on the upper surface of the filter disc (7) to intercept solids in the mixed slurry; the upper surface of the filter cloth is flush with or higher than the open top surface of the barrel-shaped shell (51); along the direction of rotation of the filter disc (7) during its operation, a feeding mechanism (8), a first flushing component (91), and a screw conveying mechanism (10) are sequentially provided on the filter cloth. The liquid collection device (12) is connected to the discharge channel (53) via the connecting pipe (14); the liquid collection device (12) is also connected to the vacuum extraction device, thereby creating a negative pressure in the area surrounded by the filter disc (7) and the barrel-shaped shell (51), accelerating the liquid in the mixed slurry to pass through the filter cloth and achieving solid-liquid separation.

2. The flat disc filter according to claim 1, characterized in that, The liquid collection device (12) includes: a buffer tank (121) and a liquid collection container (122); One side of the buffer box (121) is connected to the discharge channel (53), and the other side of the buffer box (121) is connected to one end of the connecting pipe (14). The liquid collection container (122) is connected to the other end of the connecting pipe (14), and the liquid collection container (122) is connected to the vacuum extraction device.

3. The flat disc filter according to claim 1, characterized in that, The screw conveyor mechanism (10) includes: A rotary motor (1021) is disposed on one side of the mounting base (5); The second rotating shaft (1022) has one end connected to the drive end of the rotary motor (1021), and the second rotating shaft (1022) extends toward the center of the filter disc (7) in the radial direction. The spiral fan blades (1023) are arranged around the outer peripheral wall of the second rotating shaft (1022). The spiral direction of the blades must be such that the solid material trapped on the filter cloth is transported to the outside of the barrel-shaped shell (51) along the radial direction of the filter disc (7).

4. The flat disc filter according to claim 3, characterized in that, The spiral conveying mechanism (10) further includes: an arc-shaped abutment (106); The arc-shaped support member (106) is disposed near the second rotating shaft (1022) along the length direction of the second rotating shaft (1022); the arc-shaped recessed area of ​​the arc-shaped support member (106) is opposite to the rotation direction of the filter disc (7), and its arc-shaped lower edge contacts the filter cloth; The spiral fan blade (1023) is located in the arc-shaped recessed area of ​​the arc-shaped support (106); The solid matter trapped on the filter cloth is separated by the arc-shaped abutment (106) and then conveyed to the outside of the barrel-shaped shell (51) by the spiral fan blade (1023).

5. The flat disc filter according to claim 4, characterized in that, The spiral conveying mechanism (10) further includes a cover (107); the cover (107) covers the upper side of the spiral fan blade (1023), and the side of the cover (107) is connected to the arc-shaped support member (106).

6. The flat disc filter according to claim 3, characterized in that, The spiral conveying mechanism (10) further includes: a solid transfer housing (103); The solid transfer housing (103) is disposed between the mounting base (5) and the rotary motor (1021). The feed port at the top of the housing is used to receive solids that are spirally conveyed to the outside of the barrel-shaped housing (51) by the spiral fan blades (1023). The lower part of the solid transfer housing (103) is provided with a discharge port.

7. A decomposition tank scale recycling system, characterized in that, include: A ball mill (2) is used to receive the sludge and mother liquor removed from the inner wall of the decomposition tank (1) and grind the received sludge and mother liquor into a mixed slurry. Slurry tank (3) is used for temporary storage of the mixed slurry produced by the ball mill (2); The flat plate filter according to any one of claims 1-6; the flat plate filter is used to receive the mixed slurry conveyed from the slurry tank (3), and to perform solid-liquid separation on the received mixed slurry to extract solid matter; The calcining furnace (4) is used to receive the solid material intercepted by the flat plate filter and calcine the received solid material to generate alumina.

8. The decomposition tank scale recycling system according to claim 7, characterized in that, Also includes: Belt conveyor unit (13); The belt conveyor unit (13) is located between the flat plate filter and the roasting furnace (4) to convey the solid material intercepted by the flat plate filter to the roasting furnace (4).

9. The decomposition tank scale recycling system according to claim 7, characterized in that, Also includes: Spiral conveying unit (15); The spiral conveying unit (15) is located between the flat plate filter and the roasting furnace (4) to spirally convey the solid material intercepted by the flat plate filter into the roasting furnace (4).

10. The decomposition tank scale recycling system according to claim 7, characterized in that: The ball mill (2) is provided with a first pipe at the feed end, and a first pump body is provided on the first pipe; And / or, a second pipe is provided between the ball mill (2) and the slurry tank (3), and a second pump body is provided on the second pipe; And / or, a third pipe is provided between the slurry tank (3) and the flat plate filter, and a third pump body is provided on the third pipe.

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