Separation settling tank for aluminum ash slurry

Abstract

The utility model relates to the technical field of settling tanks, and provides a separating and settling tank for aluminum ash slurry, which aims at solving the problems that the separation is not thorough and solid slag is mixed in clarified liquid when the existing settling tank is used for separating the aluminum ash slurry, and comprises a tank body, a feeding pipe is arranged at the top of the tank body in a penetrating manner, and a discharging pipe is arranged at the bottom of the tank body in a penetrating manner. A central charging barrel is erected in the middle of the tank body, the top of the central charging barrel is communicated with a feeding pipe, and the bottom of the central charging barrel is arranged close to the discharging pipe; and an anti-spoiler is arranged on the periphery of the central charging barrel in a surrounding mode, and a plurality of partition plates are erected on the anti-spoiler and the side wall face of the groove body. According to the invention, the inside and the outside of the tank body are settled and partitioned, so that the settling effect with higher strength is realized, the clarification quality of clarified liquid is ensured, the overall separation and settling effect is good, hazardous gas can be collected by an aluminum ash wet method, and the risk of explosion or poisoning caused by enrichment of hazardous gas on site is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of sedimentation tanks, and more specifically, to a separation sedimentation tank for aluminum ash slurry. Background Art

[0002] Aluminum ash refers to the ash and slag generated during the production of electrolytic aluminum or cast aluminum. After processing such as ash frying and aluminum extraction for the aluminum ash generated from electrolytic aluminum or cast aluminum, secondary aluminum ash is formed. The main components of aluminum ash include elemental aluminum, aluminum oxide, silicon dioxide, calcium oxide, iron oxide, sodium fluoride, sodium chloride, etc. The composition is complex and the reaction activity is relatively large. It can react with water and release heat, and release dangerous, toxic and harmful gases such as hydrogen and ammonia. Because it contains fluorides and has reactive toxicity, aluminum ash has currently been included in the "National List of Hazardous Wastes". Therefore, how to efficiently and resourcefully treat and utilize aluminum ash has become one of the important issues in the current development of the aluminum industry.

[0003] Currently, the treatment of aluminum ash mainly includes two methods: pyrometallurgy and hydrometallurgy. Among them, a key treatment link in hydrometallurgy is to separate the reaction liquid from the reaction slag in the reaction slurry, and a sedimentation tank is required for this process. A sedimentation tank is a gravity sedimentation device for solid-liquid separation, which can be used to increase the concentration of the suspension and obtain a clarified liquid at the same time. When the existing sedimentation tank is used for the separation and treatment of the hazardous waste residue aluminum ash slurry of electrolytic aluminum, the following problems often occur:

[0004] (1) Due to the uneven particle size distribution of the reaction residue after the hydrometallurgical treatment of aluminum ash, there are problems such as inconsistent sedimentation rate and time, resulting in poor separation effect and low efficiency; and during the use of the sedimentation tank, the addition of sedimentation flocculants is often unstable, causing problems such as waste of raw materials.

[0005] (2) During the separation and sedimentation process, the reaction residue of the aluminum ash slurry will release residual gases, resulting in the floating of the gas volume in the tank and the phenomenon of internal turbulence. Eventually, the liquid layer of the separated liquid fluctuates and becomes turbid, and it may also cause the continuous deterioration of the liquid layer, destroying its originally relatively stable equilibrium state.

[0006] (3) During the hydrometallurgical treatment of aluminum ash in electrolytic aluminum, toxic and harmful gases will be generated and will be slowly and continuously released during the separation and sedimentation process. However, the conventional sedimentation tank cannot collect the released gases, resulting in potential safety hazards such as explosion and personnel poisoning at the operation site.

[0007] Based on the above situation, there is an urgent need for a separation sedimentation tank that can be effectively applied to the aluminum ash slurry of electrolytic aluminum. Summary of the Utility Model

[0008] The purpose of the present utility model is to solve the problems that when the existing sedimentation tank is used for separating aluminum ash slurry, the separation is often incomplete and solid slag is mixed into the clarified liquid. The present application provides a separation sedimentation tank for aluminum ash slurry, which realizes a higher-strength sedimentation effect by carrying out internal and external sedimentation zoning on the inside of the tank body, and ensures the clarification quality of the clarified liquid, and the overall separation and sedimentation effect is good.

[0009] The present utility model is realized through the following technical solutions:

[0010] A separation sedimentation tank for aluminum ash slurry, comprising a tank body, an inlet pipe is penetrated through the top of the tank body, an outlet pipe is penetrated through the bottom of the tank body, a central material cylinder is erected in the middle of the tank body, the top of the central material cylinder is communicated with the inlet pipe, and the bottom of the central material cylinder is arranged close to the outlet pipe; a flow disturbance prevention plate is wound around the outer periphery of the central material cylinder, and a plurality of partition plates are erected between the flow disturbance prevention plate and the side wall surface of the tank body.

[0011] Preferably, one side of the partition plate is detachably connected to the flow disturbance prevention plate, and the other side of the partition plate is detachably connected to the inner side wall of the tank body, so that a plurality of separation areas are formed between the flow disturbance prevention plate and the side wall surface of the tank body; in each separation area, a liquid outlet pipe is penetrated through the top of the side wall surface of the tank body.

[0012] Preferably, an exhaust pipe is penetrated through the top of the tank body, and the exhaust pipe can be communicated with the separation area, between the central material cylinder and the flow disturbance prevention plate, and the inner cavity of the central material cylinder.

[0013] Preferably, a conical mud cylinder is arranged at the bottom of the tank body, and the outlet pipe is penetrated through the bottom of the conical mud cylinder.

[0014] Preferably, a stirring rake is arranged at the bottom of the conical mud cylinder, the stirring rake is provided with a central shaft, and one end of the central shaft far away from the stirring rake is detachably connected to the top of the tank body.

[0015] Preferably, the flow disturbance prevention plate comprises a plurality of plate bodies wound into a circle, a baffle is arranged on the side wall surface of the plate body, and the baffle is slidably connected to the side wall surface of the plate body.

[0016] Preferably, a rack plate is arranged on the surface of the plate body near the baffle, and the side wall surface of the baffle can be slidably clamped with the rack plate.

[0017] Preferably, a traction rod is arranged at the top of the baffle, and the traction rod is penetrated through the top of the tank body.

[0018] The technical solution of the present utility model has the following beneficial effects:

[0019] The separation and sedimentation tank for aluminum ash slurry in the present utility model is mainly applicable to occasions such as the treatment, recycling, and utilization of hazardous waste aluminum ash in electrolytic aluminum. It can quickly separate the reaction slag in the slurry, improve the problem of turbid reaction liquid existing in the existing separation and sedimentation, effectively achieve the anti-turbulent flow effect of the separation and sedimentation tank, and has high treatment efficiency. It can realize the slow wet collection of hazardous gases from aluminum ash, reducing the risks of explosion or poisoning caused by the enrichment of hazardous gases at the site. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for use in the embodiments. It should be understood that the following drawings only show some embodiments of the present utility model, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0021] Figure 1 It is the front view sectional structure schematic diagram of the separation and sedimentation tank in Embodiment 1;

[0022] Figure 2 It is the top view sectional structure schematic diagram of the separation and sedimentation tank in Embodiment 1;

[0023] Figure 3 For Figure 2 It is the partial enlarged structure schematic diagram of part A in

[0024] Figure 4 It is the partial structure schematic diagram of the anti-turbulent flow plate in Embodiment 1;

[0025] Figure 5 For Figure 4 It is the partial enlarged structure schematic diagram of part B in

[0026] Reference numerals: 1 - tank body, 11 - feed pipe, 12 - discharge pipe, 13 - exhaust pipe, 2 - central cylinder, 3 - anti-turbulent flow plate, 31 - plate body, 32 - baffle, 33 - rack plate, 34 - traction rod, 4 - partition area, 41 - partition plate, 42 - liquid outlet pipe, 5 - conical mud cylinder, 61 - stirring rake, 62 - central shaft. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] To make the objectives, 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 with reference to the accompanying 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. Usually, the components of the embodiments of the present utility model described and shown in the accompanying drawings here can be arranged and designed in various different configurations.

[0028] Accordingly, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed present invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0029] It should be noted that like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0030] Embodiment 1

[0031] As Figures 1 to 5 shown, this embodiment provides a separation and sedimentation tank for aluminum ash slurry. The separation and sedimentation tank includes a tank body 1. A feed pipe 11 penetrates through the top of the tank body 1, and a discharge pipe 12 penetrates through the bottom of the tank body 1. A central cylinder 2 is erected in the middle of the tank body 1. The top of the central cylinder 2 is communicated with the feed pipe 11, and the bottom of the central cylinder 2 is arranged close to the discharge pipe 12. A flow disturbance prevention plate 3 is wound around the outer periphery of the central cylinder 2, and a plurality of partition plates 41 are erected between the flow disturbance prevention plate 3 and the side wall surface of the tank body 1. One side of the partition plate 41 is detachably connected to the flow disturbance prevention plate 3, and the other side of the partition plate 41 is detachably connected to the inner side wall of the tank body 1, so that a plurality of separation areas 4 are formed between the flow disturbance prevention plate 3 and the side wall surface of the tank body 1. In each separation area 4, a liquid outlet pipe 42 penetrates through the top of the side wall surface of the tank body 1.

[0032] In this embodiment, an exhaust pipe 13 penetrates through the top of the tank body 1, and the exhaust pipe 13 can be communicated with the separation area 4, the space between the central cylinder 2 and the flow disturbance prevention plate 3, and the inner cavity of the central cylinder 2.

[0033] In this embodiment, a conical mud cylinder 5 is arranged at the bottom of the tank body 1, and the discharge pipe 12 penetrates through the bottom of the conical mud cylinder 5. A stirring rake 61 is arranged at the bottom of the conical mud cylinder 5. The stirring rake 61 is provided with a central shaft 62. One end of the central shaft 62 far from the stirring rake 61 penetrates through the top of the tank body 1, and a driving motor is erected on the top of the tank body 1. The central shaft 62 is fixedly connected to the output shaft of the driving motor for driving the central shaft 62 and the stirring rake to rotate.

[0034] In this embodiment, the flow disturbance prevention plate 3 includes a plurality of plate bodies 31 wound in a circle. A baffle 32 is arranged on the side wall surface of the plate body 31, and the baffle 32 is slidably connected to the side wall surface of the plate body 31. A rack plate 33 is arranged on the surface of the plate body 31 near the baffle 32, and the side wall surface of the baffle 32 can be slidably clamped with the rack plate 33. A traction rod 34 is arranged on the top of the baffle 32. The traction rod 34 penetrates through the top of the tank body 1, and a telescopic cylinder is arranged on the top of the tank body 1. The top of the traction rod 34 is fixedly connected to the propulsion shaft of the telescopic cylinder for controlling the up and down sliding of the baffle 32.

[0035] Among them, the separation and sedimentation tank of this embodiment is also equipped with a controller and a power supply, which are electrically connected to components such as a driving motor and a telescopic cylinder respectively, so as to regulate the orderly operation of each mechanism unit. The controller can be a single-chip microcomputer (such as 8051 series single-chip microcomputers, STM32 series single-chip microcomputers), an FPGA programmable controller, etc.

[0036] In this embodiment, the aluminum ash slurry is introduced into the central cylinder 2 through the feed pipe 11. Sedimentation reagents such as flocculants are mixed in the feed pipe 11. The slurry undergoes sedimentation in the central cylinder 2. Large particle substances such as aluminum ash quickly settle to the conical mud cylinder 5 at the bottom and can be discharged from the discharge pipe 12; while the clarified liquid after separation and sedimentation slowly flows from the bottom of the central cylinder 2 to the outside of the anti-turbulence plate 3 and then flows upward to the overflow port. Among them, the residual solid slag particles in the clarified liquid also continue to settle to the bottom of the tank body 1; among them, the partition plate 41 erected between the anti-turbulence plate 3 and the tank body 1 can partition the clarified liquid by area, and each area is provided with a liquid outlet pipe 42 communicating with the overflow port. If it is found that there is solid slag in the clarified liquid of a certain area, the partition plate of this partition can be controlled to move down, that is, stop the sedimentation work of this partition, and at the same time avoid the slag-containing liquid in this partition from affecting the separation effect of the clarified liquid in other partitions.

[0037] During the above separation and sedimentation period, large particles and other substances will also slowly discharge dangerous gases, and the gases will float upward and expand. During the process, it may cause the already clarified liquid to become turbid again. However, through the setting of multiple partition areas 4, the problem of turbulence and turbidity can be greatly reduced. Since large particles are the source of gas release, there is basically no turbidity situation on the outermost side. This part of the clarified liquid is separated and flows out from the overflow port of the liquid outlet pipe 42 in the shortest time; the dangerous gases are centrally collected at the top of the tank body 1, and all flammable, explosive and toxic gases can be collected and sent to the subsequent process sections to reduce the risk of on-site safety hazards.

[0038] In summary, the separation and sedimentation tank for aluminum ash slurry in this embodiment is mainly applicable to occasions such as the treatment, recovery and utilization of hazardous waste aluminum ash in electrolytic aluminum. It can quickly separate the reaction slag in the slurry, improve the problem of turbid reaction liquid existing in the existing separation and sedimentation, effectively achieve the anti-turbulence effect of the separation and sedimentation tank, and has high treatment efficiency. It can realize the slow wet collection of dangerous gases from aluminum ash, and reduce the risks of on-site enrichment and explosion or poisoning of dangerous gases.

[0039] The above is only the preferred embodiment of the present invention and is not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A separation sedimentation tank for aluminum ash slurry, characterized in that: The invention comprises a tank body (1), wherein a feed pipe (11) is passed through the top of the tank body (1), a discharge pipe (12) is passed through the bottom of the tank body (1), a central barrel (2) is arranged in the middle of the tank body (1), the top of the central barrel (2) is connected to the feed pipe (11), and the bottom of the central barrel (2) is arranged close to the discharge pipe (12); An anti-spoiler plate (3) is arranged around the outer periphery of the central barrel (2), and a plurality of partition plates (41) are arranged between the anti-spoiler plate (3) and the side wall of the tank body (1).

2. The separation sedimentation tank for aluminum ash slurry according to claim 1, characterized in that: One side of the partition plate (41) is detachably connected to the spoiler plate (3), and the other side of the partition plate (41) is detachably connected to the inner wall of the tank body (1), so that a plurality of partition areas (4) are formed between the spoiler plate (3) and the side wall of the tank body (1); In each of the partition areas (4), a liquid outlet pipe (42) is provided through the top of the side wall of the tank body (1).

3. The separation sedimentation tank for aluminum ash slurry according to claim 2, characterized in that: An exhaust pipe (13) is provided on the top of the tank body (1), and the exhaust pipe (13) can be communicated with the partition area (4), between the central barrel (2) and the spoiler plate (3), and the inner cavity of the central barrel (2).

4. The separation sedimentation tank for aluminum ash slurry according to claim 1, characterized in that: A conical mud cylinder (5) is provided at the bottom of the tank body (1), and the discharge pipe (12) is passed through the bottom of the conical mud cylinder (5).

5. The separation sedimentation tank for aluminum ash slurry according to claim 4, characterized in that: The bottom of the conical mud barrel (5) is provided with a stirring rake (61), and the stirring rake (61) is provided with a central axis (62). One end of the central axis (62) away from the stirring rake (61) is detachably connected to the top of the tank body (1).

6. The separation sedimentation tank for aluminum ash slurry according to any one of claims 1 to 5, characterized in that: The spoiler plate (3) comprises a plurality of plate bodies (31) arranged around a circumference, the side wall surface of the plate body (31) being provided with a baffle plate (32), and the baffle plate (32) being slidably connected to the side wall surface of the plate body (31).

7. The separation sedimentation tank for aluminum ash slurry according to claim 6, characterized in that: A rack plate (33) is provided on the surface of the plate body (31) at a position close to the baffle plate (32), and the side wall surface of the baffle plate (32) can be slidably engaged with the rack plate (33).

8. The separation sedimentation tank for aluminum ash slurry according to claim 6, characterized in that: A traction rod (34) is arranged on the top of the baffle (32), and the traction rod (34) is passed through the top of the trough body (1).

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