A secondary aluminum dross pretreatment device

Abstract

The utility model belongs to hazardous waste disposal equipment technical field, concretely relates to a secondary aluminium ash pretreatment device, through design scraper mechanism, material falls on the receiving tray after the blanking mechanism, scraper mechanism evenly spreads material on the receiving tray, increases the contact area of material and water, can realize the consumption of less water resource. In addition, through the ceaseless spreading of scraper mechanism, can play the role similar to "stir -frying", thereby improved the reaction efficiency of aluminium nitride in material, through setting up disc -type heating structure, heating surface is bigger, the material after spreading is thinner, can better make material reaction, also greatly reduces the consumption of energy, material flows down from top to bottom arrangement, and every layer is arranged with heat source, can guarantee being in dry state when material tapping, and utilizes the action of gravity and can freely tapping, guarantees the unobstructedness when material flows.

Description

Technical Field

[0001] This utility model belongs to the technical field of hazardous waste disposal equipment, specifically relating to a secondary aluminum ash pretreatment device. Background Technology

[0002] Secondary aluminum ash is a solid waste generated during aluminum production and processing. It mainly consists of aluminum oxide, aluminum nitride, salts, and other impurities. It is toxic and reactive and is classified as hazardous waste. Secondary aluminum ash is primarily generated from the slag and skimmed residue floating on the surface of molten aluminum during the electrolytic aluminum, cast aluminum, and recycled aluminum metallurgical melting processes, including the residue remaining after subsequent processes such as ash frying and ball milling.

[0003] Following the initial listing of aluminum ash as hazardous waste, secondary aluminum ash was further included in the "National Hazardous Waste List" in 2019. The reason for this inclusion is that secondary aluminum ash typically contains aluminum nitride, metallic aluminum, aluminum carbide, and fluorides. The aluminum nitride, metallic aluminum, and aluminum carbide react with water or humid gases to produce aluminum hydroxide and ammonia, respectively. The generation of ammonia pollutes the atmosphere, as well as the water and soil in the storage area, posing a significant safety hazard.

[0004] Therefore, how to quickly, effectively, and safely pretreat secondary aluminum ash has become very important and is one of the key research areas for those skilled in the art. Summary of the Invention

[0005] To address the safety and environmental protection issues in the current aluminum ash disposal process, this utility model provides a secondary aluminum ash treatment device, including a main body and a fixed support on the upper part of the main body. A weighing scale and a ton bag rack are fixedly installed inside the fixed support. The weighing scale is located at the lower end of the ton bag rack, which is connected to a discharge pipe via a star-shaped discharge valve. A spray gun is installed on the side of the discharge pipe. The main body is hollow, with a heat source pipe installed on its hollow side. A rotating shaft and a scraper fixedly installed to the rotating shaft are located at the center. A receiving tray fixedly connected to the heat source pipe is installed at the lower end of the discharge pipe. The lower edge of the scraper blade abuts against the upper surface of the receiving tray. A slag outlet is located at the bottom of the main body, and an exhaust gas outlet is located at the top. A rotating motor connected to the rotating shaft is located outside the main body.

[0006] The main components of the treated aluminum ash are aluminum oxide and impurities, which can be reused through different processes. For example, aluminum sulfate and basic aluminum chloride can be prepared by acid leaching for use as water purification agents, as well as for the preparation of refractory materials and microcrystalline glass. The treated aluminum ash can also be sintered and melted to recover the aluminum, and the remainder can be used to make pre-melted calcium aluminate for steelmaking.

[0007] The specific technical solution of this utility model is as follows: A secondary aluminum ash pretreatment device includes a main body and a fixed support on the upper part of the main body. The main body has a cavity inside, a heat source pipe is provided on its side, and a rotating shaft is provided in the center. The lower end of the feeding pipe is provided with a receiving tray that is connected and fixedly connected to the heat source pipe. The receiving tray includes a small receiving tray and a large receiving tray, which are arranged alternately and staggered in the vertical direction.

[0008] The fixed bracket internally supports and fixes a weighing scale and a ton bag frame. The weighing scale is located at the lower end of the ton bag frame. The lower end of the ton bag frame is connected to the discharge pipe via a star-shaped discharge valve. A spray gun is provided on the side of the discharge pipe. A manhole is provided on the side wall of the main body of the device. A slag outlet is provided at the bottom of the main body of the device, and an exhaust gas outlet is provided at the top. A rotating motor connected to the rotating shaft is provided on the outside of the main body of the device.

[0009] Furthermore, the radius of the small receiving tray is smaller than the corresponding internal dimension of the device body, and there is a gap between it and the outer wall of the device body. Its center is in close contact with the rotating shaft. The center of the large receiving tray is provided with a through hole. At the same time, a baffle is provided on the outer edge of the large receiving tray corresponding to the small receiving tray. The distance between the baffle and the central rotating shaft is greater than the outer radius of the small receiving tray.

[0010] The upper part of the receiving tray is equipped with a scraper, which is fixedly connected to a crossbar fixed on the rotating shaft. The lower edge of the scraper blade abuts against the upper surface of the receiving tray. When the rotating motor is turned on, it can drive the rotating shaft and the scraper to rotate, stir-fry and transfer the material.

[0011] Furthermore, the scraper includes a front scraper and a back scraper. The scraper is designed as a single piece, consisting of an upper part and a lower part. The lower part is tilted at a certain angle relative to the upper part. The side with the tilt of the lower part is the front scraper, and the other side is the back scraper. The scraper is connected to the crossbar through a connecting part.

[0012] Preferably, when the scraper rotates clockwise, the scrapers on the upper part of the small receiving tray are arranged at an obtuse angle, and the scrapers on the upper part of the large receiving tray are arranged at an acute angle.

[0013] With this design, the scraper on the upper part of the small receiving tray scrapes the aluminum ash in a circumferential direction, causing the aluminum ash to fall from the outside of the small receiving tray into the edge of the lower large receiving tray. At this time, the scraper on the upper part of the large receiving tray scrapes the aluminum ash towards the center and falls from the through hole in the center of the large receiving tray into the next layer of small receiving trays, thus realizing the sequential movement of aluminum ash between each layer of receiving trays; the scraper and the crossbar fixed on the rotating shaft are connected by snap-fit ​​or thread.

[0014] The receiving tray is hollow inside, and the heat source pipes are connected to each layer of the receiving tray through horizontal pipes. The hollow passage inside the receiving tray allows each heat source pipe to be connected to itself.

[0015] Preferably, a valve is provided at the connection between the heat source pipe and the receiving tray. A heating medium can be introduced into the heat source pipe, and the heating medium can be one of steam, hot water, heat transfer oil, and high-temperature molten salt. The heating medium enters the heat source pipe at one end, enters the receiving tray at one end of the heat source pipe, and exits the heat source pipe at the other end of the receiving tray.

[0016] The bottom wall inside the main body of the device is inclined to a certain extent with respect to the slag outlet; preferably, the inclination angle is 30-40 degrees, which facilitates the discharge of aluminum ash from the slag outlet.

[0017] The material moves along an Archimedean spiral trajectory on the disc surface. The distance the material travels on each disc layer is much greater than the disc diameter, and it falls layer by layer. Heat is transferred through each disc layer, ensuring thorough and uniform heat exchange from top to bottom, while minimizing material breakage. Furthermore, the layered arrangement and vertical installation provide a large reaction area while occupying a small footprint.

[0018] In summary, the secondary aluminum ash pretreatment device provided in this application, through the design of the scraper mechanism, ensures that after the material falls onto the receiving tray from the feeding mechanism, the scraper mechanism evenly spreads the material on the receiving tray, increasing the contact area between the material and water, thus achieving less water consumption. Furthermore, the continuous spreading by the scraper mechanism acts similarly to "stir-frying," thereby improving the reaction efficiency of aluminum nitride in the material. In this invention, by setting a disc heating structure, the heating surface is larger and the spread material is thinner, which can better enable the material to react and greatly reduce energy consumption. In this invention, the material flow is arranged from top to bottom, and each layer is equipped with a heat source. The material is kept dry when it is discharged, and it can be discharged freely by gravity, ensuring the smooth flow of the material. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the secondary aluminum ash pretreatment device of this utility model; Figure 2 This is a side view of the interior of the main body of the device; Figure 3 This is a three-dimensional view of the interior of the main body of the device (only one set of large and small receiving trays is shown for illustration). Figure 4 This is a top view of the scraper on the small receiving tray when it is rotated clockwise; Figure 5 This is a top view of the scraper on the large receiving tray when it is rotated clockwise. Figure 6 This is a schematic diagram of the slag outlet structure; Figure 7 This is a side view of the scraper.

[0020] In the figure, 1 is a weighing scale, 2 is a star-shaped unloading valve, 3 is a spray gun, 4 is a discharge pipe, 5 is a receiving tray, 5-1 is a small receiving tray, 5-2 is a large receiving tray, 6 is a scraper, 6-1 is the front of the scraper, 6-2 is the back of the scraper, 6-3 is a connecting part, 7 is a manhole, 8 is a slag outlet, 9 is a waste gas outlet, 10 is a heat source pipe, 11 is a rotating motor, 12 is a ton bag frame, 13 is the main body of the device, and 14 is a fixed support. Detailed Implementation

[0021] The technical solution of this utility model will be described in detail below with reference to the accompanying drawings. The following embodiments are merely exemplary and can only be used to explain and illustrate the technical solution of this utility model, and should not be construed as limiting the technical solution of this utility model.

[0022] This utility model provides a secondary aluminum ash pretreatment device, such as... Figure 1 As shown, the device includes a main body 13 and a fixed support 14 on the upper part of the main body. A weighing scale 1 and a ton bag rack 12 are fixedly mounted inside the fixed support 14. The weighing scale 1 is located at the lower end of the ton bag rack 12. The lower end of the ton bag rack 12 is connected to a discharge pipe 4 via a star-shaped discharge valve 2. A spray gun 3 is installed on the side of the discharge pipe 4. The main body 13 has a hollow interior, with a heat source pipe 10 installed on its side and a rotating shaft at its center. A receiving tray 5, which is connected and fixedly connected to the heat source pipe 10, is installed at the lower end of the discharge pipe 4. Figure 2 and Figure 3 As shown, the receiving tray 5 includes a small receiving tray 5-1 and a large receiving tray 5-2, which are arranged alternately and in staggered layers in the vertical direction.

[0023] Furthermore, the radius of the small receiving tray 5-1 is smaller than the corresponding internal dimension of the main body of the device, and there is a gap between it and the outer wall of the main body of the device. Its center is in close contact with the rotating shaft. The center of the large receiving tray 5-2 is provided with a through hole. At the same time, the large receiving tray 5-2 is provided with a baffle corresponding to the outer edge of the small receiving tray 5-1. The distance between the baffle and the central rotating shaft is greater than the outer radius of the small receiving tray 5-1.

[0024] The upper part of the receiving tray 5 is provided with a scraper 6. The scraper 6 is fixedly connected to a crossbar fixed on the rotating shaft, and the lower edge of the scraper blade 6 abuts against the upper surface of the receiving tray 5. When the rotating motor 11 is turned on, it can drive the rotating shaft and the scraper 6 to rotate, stir-fry and transfer the material.

[0025] Furthermore, such as Figure 4 , Figure 5 as well as Figure 7As shown, the scraper 6 includes a front scraper 6-1 and a back scraper 6-2. The scraper 6 is a one-piece design divided into an upper part and a lower part. The lower part is tilted at a certain angle relative to the upper part. The side of the lower part in the tilt direction is the front scraper 6-1, and the other side is the back scraper 6-2. The scraper 6 is connected to the crossbar through the connecting part 6-3.

[0026] The same function can be achieved by using a scraper that does not distinguish between the front and back sides. By dividing the scraper into an upper and lower part to form a front and back side, the scraping efficiency is relatively better compared to a scraper that does not distinguish between the front and back sides.

[0027] Preferably, when the scraper 6 rotates clockwise, the scrapers on the upper part of the small receiving tray are arranged at an obtuse angle, and the scrapers on the upper part of the large receiving tray are arranged at an acute angle; specifically, the scraper back surface 6-2 of the scraper 6 forms a certain angle with its connecting part 6-3, such as... Figure 4 and Figure 5 As shown, specifically: when the scraper rotates clockwise, the scraper 6 on the upper part of the small receiving tray 5-1 is fixed, and the angle between its reverse side 6-2 and the connecting part 6-3 (the angle on the clockwise side) is... Figure 4 Angle a) in the middle is an obtuse angle; the scraper 6 on the upper part of the large receiving tray 5-2 is fixed, and the angle between the reverse side of the scraper 6-2 and the connecting part 6-3 (the angle on the clockwise side) is... Figure 5 Angle b) is an acute angle. More preferably, angle a is 135 degrees and angle b is 45 degrees.

[0028] With this design, the scraper 6 on the upper part of the small receiving tray 5-1 scrapes the aluminum ash in a circumferential direction, so that the aluminum ash falls from the outside of the small receiving tray 5-1 into the edge of the lower large receiving tray 5-2. At this time, the scraper 6 on the upper part of the large receiving tray 5-2 scrapes the aluminum ash towards the center and falls from the through hole in the center of the large receiving tray 5-2 into the next layer of small receiving trays, thus realizing the sequential movement of aluminum ash between each layer of receiving trays.

[0029] The device body has a manhole 7 on its side wall, a slag outlet 8 at the bottom and a waste gas outlet 9 at the top, and a rotating motor 11 connected to the rotating shaft on the outside of the device body.

[0030] Among the above components, the weighing scale 1 is used for weighing secondary aluminum ash, and adopts subtraction measurement to ensure the proportion of secondary aluminum ash; the star-shaped unloading valve 2 is a closed feeding mechanism, which is frequency-controlled and interlocked with the weighing scale to ensure the uniformity of feeding; preferably, the star-shaped unloading valve and the weighing scale are interlocked by the PID control system.

[0031] The spray gun 3 is an atomizing spray gun or a single-fluid spray gun; the feeding pipe 4 is a secondary aluminum ash feeding port, which can be a flexible hose or a rigid pipe; the receiving tray 5 is a material drying device with a hollow internal structure and is connected to a heat source; the scraper 6 is a material spreading device; the scraper 6 is connected to the crossbar fixed on the rotating shaft by a snap-fit ​​or threaded connection.

[0032] The receiving tray 5 is hollow inside. The heat source pipe 10 is connected to each layer of the receiving tray 5 through a horizontal pipe. The hollow passage inside the receiving tray 5 allows each heat source pipe to be connected. Preferably, a valve is provided at the connection between the heat source pipe 10 and the receiving tray 5. A heating medium can be introduced into the heat source pipe 10. The heating medium can be one of steam, hot water, heat transfer oil, or high-temperature molten salt. The heating medium enters one end of the heat source pipe 10, enters one end of the receiving tray 5 from the heat source pipe 10, and exits from the other end of the receiving tray 5 into the other end of the heat source pipe 10.

[0033] The manhole 7 is the inspection port of the pretreatment device and is fastened with a snap-fit ​​fastener; the slag outlet 8 is the discharge port for secondary aluminum ash after pretreatment; the rotating motor 11 is the energy supply mechanism of the pretreatment device; the heat source pipe 10 is the heat source for the pretreatment device and is arranged in multiple layers; the exhaust gas outlet 9 is the exhaust gas outlet generated during the pretreatment process and is connected to the downstream treatment process.

[0034] Figure 6 The diagram shows the slag outlet 8. The bottom wall inside the main body 13 of the device is inclined to a certain extent with respect to the slag outlet. Preferably, the inclination angle is 30-40 degrees to facilitate the discharge of aluminum ash from the slag outlet.

[0035] The specific processing procedure of the device is as follows: First, the secondary aluminum ash contained in the ton bag is lifted to the ton bag rack 12 by a crane to start weighing. After being weighed by the weighing scale 1, the material is discharged by the star-shaped discharge valve 2. The weighing scale 1 and the star-shaped discharge valve 2 are equipped with a PID interlock of the electronic control system. When the weighing scale 1 shows that the discharge is too fast, the rotation speed of the star-shaped discharge valve 2 can be automatically adjusted through the PID interlock of the electronic control system. Next, the material is discharged into the lower receiving tray 5 through the discharge pipe 4. During the discharge process, industrial water is sprayed onto the material through the spray gun 3 to wet the material. This can ensure that the material starts to react and also ensure that the material does not generate "secondary dust" during the falling process. The wet material falls continuously from the discharge pipe into the receiving tray 5. The scraper 6 rotates under the drive of the rotating motor to start continuously stirring the material. The material flows along an exponential spiral path over the surface of the receiving tray 5, which consists of two types of trays, large and small, arranged in a staggered manner. Material on the small trays is moved to the outer edge and falls onto the outer edge of the large tray below. On the large drying tray, the material moves inward and falls through the central discharge port into the next layer of small trays. The large and small drying trays are arranged alternately, allowing the material to flow continuously throughout the system. A heating medium is introduced into the hollow receiving tray 5 via a heat source pipe 10, entering from one end and exiting from the other. The dried material is moved from the last layer of receiving trays 5 by a scraper 6 to the slag discharge port 8 for discharge. Moisture and ammonia produced during the reaction escape from the material and are discharged through the exhaust port 9 located on the top cover.

[0036] The main components of the treated aluminum ash are aluminum oxide and impurities, which can be reused through different processes. For example, aluminum sulfate and basic aluminum chloride can be prepared by acid leaching for use as water purification agents, and for the preparation of refractory materials and microcrystalline glass. The treated aluminum ash can also be sintered and melted to recover the aluminum, and the remainder can be used to make pre-melted calcium aluminate for steelmaking.

[0037] Preferably, the PID interlock of the electronic control system can be based on the discharge valve model, such as RC-10SNS, RC-50SNS, RC-300SNS, RC-10DHS, RC-50DHS, RC-300DHS, etc. The PID interlock of the electronic control system is a well-known technical means in the field and will not be described in detail here.

[0038] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A secondary aluminum ash pretreatment device, comprising a main body (13) and a fixed support (14) on the upper part of the main body, characterized in that, The fixed bracket (14) internally supports and fixes a weighing scale (1) and a ton bag rack (12). The weighing scale (1) is located at the lower end of the ton bag rack (12). The lower end of the ton bag rack (12) is connected to the discharge pipe (4) via a star-shaped unloading valve (2). A spray gun (3) is provided on the side of the discharge pipe (4). The main body (13) of the device is hollow inside. A heat source pipe (10) is provided on its side, and a rotating shaft is provided in the center. The lower end of the discharge pipe (4) is provided with a heat source pipe (10). The source pipe (10) is connected to and fixedly connected to the receiving tray (5). The receiving tray (5) includes a small receiving tray (5-1) and a large receiving tray (5-2). The small receiving tray (5-1) and the large receiving tray (5-2) are arranged alternately in the vertical direction. The upper part of the receiving tray (5) is provided with a scraper (6). The scraper (6) is fixedly connected to a crossbar fixed on the rotating shaft, and the lower edge of the scraper blade (6) abuts against the upper surface of the receiving tray (5).

2. The secondary aluminum ash pretreatment device according to claim 1, characterized in that, The radius of the small receiving tray (5-1) is smaller than the internal dimension of the main body (13) of the device, and there is a gap between it and the outer wall of the main body (13). Its center is sealed to the rotating shaft. The center of the large receiving tray (5-2) is provided with a through hole. The outer edge of the large receiving tray (5-2) is provided with a baffle corresponding to the small receiving tray (5-1). The distance between the baffle and the central rotating shaft is greater than the outer radius of the small receiving tray (5-1).

3. The secondary aluminum ash pretreatment device according to claim 1, characterized in that, The scraper (6) includes a front scraper (6-1) and a back scraper (6-2). The scraper (6) is designed as a single piece, consisting of an upper part and a lower part. The lower part is tilted at a certain angle relative to the upper part. The side of the lower part that is tilted is the front scraper (6-1), and the other side is the back scraper (6-2). The scraper (6) is connected to the crossbar through a connecting part (6-3).

4. The secondary aluminum ash pretreatment device according to claim 3, characterized in that, When the scraper (6) rotates clockwise, the scrapers on the upper part of the small receiving tray (5-1) are arranged at an obtuse angle, and the scrapers on the upper part of the large receiving tray (5-2) are arranged at an acute angle.

5. The secondary aluminum ash pretreatment device according to claim 1, characterized in that, The device body (13) has a manhole (7) on its side wall, a slag outlet (8) at the bottom of the device body (13), a waste gas outlet (9) at the top of the device body (13), and a rotating motor (11) connected to the rotating shaft on the outside of the device body (13).

6. The secondary aluminum ash pretreatment device according to claim 1, characterized in that, The star-shaped unloading valve (2) and the metering scale (1) are interlocked by an electronic control system PID.

7. The secondary aluminum ash pretreatment device according to claim 1, characterized in that, The inside of the receiving tray (5) is hollow, and the heat source pipe (10) is connected to the receiving tray (5) of each layer through a horizontal pipe.

8. The secondary aluminum ash pretreatment device according to claim 1, characterized in that, There is a certain inclination between the bottom wall inside the main body (13) and the slag outlet (8), with an inclination angle of 30-40 degrees.

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