Apparatus and method for separating spent polishing powder from aluminum alloy

Abstract

The application discloses a device and method suitable for separating polished aluminum powder and failed polishing sand of aluminum alloy, and belongs to the technical field of physical separation. S1, a first circulating pump is used to circulate the upper waste liquid in a waste pool, and the circulating medium is water in the polishing waste liquid; the waste liquid is pumped into an aluminum powder separator, and the aluminum powder is separated by a filter element with a filtering precision of 1-5 microns in the aluminum powder separator; S2, a second circulating pump is used to pump the polishing sand in the lower layer of the waste pool into a large-particle separator, and the polishing sand is subjected to first filtering separation by a stainless steel filter screen with a pore diameter of 80 microns arranged in the large-particle separator; S3, a third circulating pump is used to secondly separate the polishing sand in a small-particle separation pool, and after the separation of the small-particle separator, the large particles return to the large-particle separation pool with circulating water, and the small particles return to the small-particle separation pool to be enriched, so that the polishing sand is separated according to the particle size.

Description

Technical Field

[0001] This invention relates to the field of physical separation technology, and specifically to an apparatus and method for separating aluminum powder and failed polishing sand used in aluminum alloy polishing. Background Technology

[0002] The production of metal exterior components for consumer electronics products requires physical polishing processes. For example, aluminum alloy mobile phone casings need sandblasting and polishing. Considering safety and environmental factors, the ideal choice is a wet polishing process using water as a carrier and zirconium oxide or alumina as the polishing medium. Zirconium oxide and alumina are much harder than aluminum alloys, making them ideal polishing media. The typical operation involves mixing water and polishing abrasive in a specific ratio in a water tank. Continuous mechanical stirring ensures the abrasive is suspended as evenly as possible in the water. A high-pressure pump then sprays the water-polishing abrasive mixture onto the surface of the aluminum alloy workpiece, utilizing the tribochemical ploughing effect to polish the surface. Depending on the required polishing precision and smoothness, the appropriate type of polishing abrasive and its particle size distribution must be selected. Polishing abrasive undergoes breakage during use due to friction and collisions, causing a gradual change in particle size distribution. All particle sizes shift towards smaller sizes, reducing the number of large-sized particles and decreasing polishing efficiency. Simultaneously, the amount of aluminum powder polished off accumulates, necessitating separation. After a certain service life, the polishing abrasive becomes ineffective and needs replacement. However, a considerable number of usable particles remain within the ineffective abrasive. Separating and reusing this usable portion aligns with green manufacturing and sustainable development principles, offering both economic and social benefits—making it a meaningful endeavor. Currently, no equipment or device can accomplish this task; therefore, inventing a separation device is of practical significance.

[0003] Existing methods for separating solid particles include dry and wet methods, with dry methods being the most common. Wet separation methods are mostly chemical separation methods, requiring the introduction of a third component, and in many cases, the byproducts of the separation process require subsequent environmental treatment. Dry separation methods for solid particles have the widest application range and the longest history, with a large number of separation methods and techniques available, and the separation precision and efficiency can meet the needs of different application scenarios. However, dry separation methods also have significant drawbacks, such as dust, noise, energy consumption, and large equipment size, making them clearly unsuitable for some special applications. To address these issues, this invention proposes a device and method suitable for separating aluminum powder and spent polishing sand from aluminum alloy polishing. Summary of the Invention

[0004] The purpose of this invention is to provide an apparatus and method for separating aluminum powder and spent polishing abrasive particles from aluminum alloy polishing, and to provide a separation apparatus that does not require drying, is energy-saving, and directly separates aluminum powder and spent polishing abrasive particles using a wet process. This separation apparatus and method mainly utilize the differences in the physical properties of the components in the waste liquid, amplifying the influence of density differences on the settling velocity of aluminum powder and polishing abrasive particles through the circulation of fluid water, thereby improving separation efficiency. Furthermore, it utilizes the mechanical vibration generated by ultrasound to reduce filter clogging, achieving effective separation of aluminum powder and spent polishing abrasive particles according to target sizes, thus solving the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A device for separating aluminum powder and spent polishing sand from aluminum alloy polishing includes a first circulation pump, a second circulation pump, a third circulation pump, an aluminum powder separator, a large particle separator, a small particle separator, a throttle valve, a visual flow meter, a large particle separation tank, a small particle separation tank, and a waste tank. The first circulation pump, aluminum powder separator, visual flow meter, waste tank, and matching connecting pipes together form a first circulation loop; the second circulation pump, large particle separator, visual flow meter, large particle separation tank, waste tank, and matching connecting pipes together form a second circulation loop; and the third circulation pump, small particle separator, visual flow meter, small particle separation tank, waste tank, and matching connecting pipes together form a third circulation loop. The system comprises three interconnected circulation loops: the first, second, and third circulation loops. Throttling valves are fixedly installed at the inlet and outlet of the connecting pipes of each circulation loop. The flow rate of fluid in each pipe is distributed by adjusting the opening degree or size of the throttle valve. When the throttle valve closes from a large to a small position, the flow rate downstream of the throttle valve decreases, while the fluid pressure in the upstream pipe increases, correspondingly increasing the flow rate in another parallel pipe. This improves the flexibility and adaptability of the separation process, allowing for free switching and allocation between separation efficiency and accuracy. The waste tank, large particle separation tank, and small particle separation tank are all equipped with level alarm and control systems. An ultrasonic mechanical vibration system is also installed at the large particle separator, with an ultrasonic power of 800 W, an ultrasonic frequency of 28 kHz, and a power supply of AC380V three-phase five-wire. A pressure gauge is fixedly installed on the connecting pipe between the first circulation pump and the aluminum powder separator to monitor the filtration operation in real time. If the pressure exceeds the set rated value, the aluminum powder filter needs to be cleaned.

[0007] Preferably, the media that the device can separate include, but are not limited to, aluminum powder, alumina, and zirconium oxide solid particles.

[0008] Preferably, the device is designed with the surrounding panels divided into upper and lower sections and openable on both sides, and all panels can be opened 180 degrees. Each door is connected to the frame by two symmetrical hinges. Both the panels and the frame are made of 304 stainless steel.

[0009] Preferably, the waste pool, large particle separation pool, and small particle separation pool all adopt a sloping bottom design, which is to facilitate the solid particles to flow into the bottom outlet of the pool to the maximum extent by gravity, thereby improving separation efficiency and separation accuracy.

[0010] A further proposed method for separating aluminum powder and failed polishing abrasive in aluminum alloy polishing includes the following steps:

[0011] S1. Use the first circulation pump to circulate the upper layer of waste liquid in the waste pool. The circulation medium is the water contained in the polishing waste liquid. Pump the waste liquid into the aluminum powder separator and use the filter element with a filtration accuracy of 1-5 μm in the aluminum powder separator to separate aluminum powder. After separation and filtration, pump the clean water back to the waste pool through the connecting pipe for recycling. The aluminum powder is enriched through the filter element. Use the installed pressure gauge to monitor the inlet pressure of the filter element of the aluminum powder separator. When the pressure reaches or exceeds the preset threshold, clean or replace the filter element of the aluminum powder filter and recover the aluminum powder.

[0012] S2. Using the second circulation pump, the polishing sand from the lower layer of the waste pool is pumped to the large particle separator. The polishing sand is first filtered and separated using an 80 μm pore size stainless steel filter screen installed inside the large particle separator. Large particles are enriched and transported to the large particle separation tank via fluid water, while small particles enter the small particle collection tank with the fluid water. At the same time, the ultrasonic mechanical vibration system is activated to prevent large particles from clogging the large particle separator. The stability of the separation process is observed using a visual flow meter installed on the circulation loop pipeline, and the flow rate of each pipeline is adjusted and controlled by a throttle valve. The large polishing sand particles that have been separated and enriched are discharged from the bottom of the large particle collection tank for recycling.

[0013] S3. Use the third circulation pump to perform a second separation of the polishing sand in the small particle separation tank. After separation by the small particle separator, the large particles return to the large particle separation tank with the circulating water, while the small particles return to the small particle separation tank for enrichment. Set the enrichment standard as needed, and discharge the small particle polishing sand from the small particle separation tank when the standard is reached, thereby achieving the purpose of separating the failed polishing sand according to the particle size.

[0014] Preferably, the mixed waste in S1 contains fluid water, aluminum powder, and polishing sand. The aluminum powder particles have an average particle size greater than 5 μm, and the polishing sand is approximately spherical in appearance with an average particle size of 80 μm, exhibiting a normal distribution. The fluid water has a density of 1 g / cm³. 3The density of the aluminum powder is less than 2.7 g / cm³. 3 The density of the polishing abrasive is less than 5.89 g / cm³. 3 .

[0015] Preferably, the small particle separator used in S3 is designed with two outlets. One outlet is used to separate and enrich polishing sand with a particle size greater than or less than 80 μm and mixed particles with a diameter greater than 80 μm, which are then returned to the small particle separation tank with the fluid water. The other outlet is used to periodically discharge particles smaller than 80 μm from the small particle separator according to the enrichment quantity.

[0016] Preferably, the filter element of the aluminum powder separator mentioned in S1 adopts an easy-to-disassemble design and follows the principle of saturation replacement during use; the filter element of the large particle separator mentioned in S2 adopts a stainless steel filter screen design with an average filtration diameter of 80 μm. This filter element can be replaced with other sizes or specifications of filter screens according to different filtration requirements to achieve the separation of solid particles of different sizes, and has broad-spectrum separation flexibility; the filter element used in the small particle separator in S3 is the same as the filter element of the large particle separator. During use, small particles are discharged from the bottom of the small particle separator, and mixed particles of different sizes enter the small particle separation tank with the fluid water for secondary circulation filtration and separation.

[0017] Compared with the prior art, the present invention provides an apparatus and method for separating aluminum powder and failed polishing abrasive in aluminum alloy polishing, which has the following beneficial effects:

[0018] (1) The present invention proposes an apparatus and method for separating aluminum powder and failed polishing sand in aluminum alloy polishing. It can realize the recycling and reuse of polishing waste liquid, separate aluminum powder by physical method and perform efficient and high-precision separation of polishing sand particles. By setting the filter mesh pore size of different separation units, it can realize the continuous separation of aluminum powder and polishing sand particles with different particle sizes at the micron level based on particle size, and overcome the disadvantages of conventional separation technology such as high energy consumption, high noise, low efficiency and dust pollution.

[0019] (2) The present invention uses a circulating pump to drive a combined ultrasonic mechanical vibration filtration and separation system. The optimized process design enables aluminum powder and polishing sand to flow stably in the system. According to the separation accuracy requirements, repeated circulation and multiple iterations of separation can be achieved, avoiding the sedimentation and filter unit blockage problems caused by conventional fluid-driven devices. The ultrasonic mechanical vibration filtration device performs continuous separation of aluminum powder and polishing sand particles based on particle size, providing a means for the recycling and reuse of polishing sand and filling the technical gap of wet separation and recycling of polishing sand. By setting fluid pipeline throttle valves to control the flow rates of each inlet and outlet of the system, the separation effect and separation efficiency of aluminum powder and polishing sand particles are ensured. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the external structure of the device for separating aluminum powder and failed polishing sand in aluminum alloy polishing according to the present invention.

[0021] Figure 2 This is a process flow diagram of the apparatus and method for separating aluminum powder and failed polishing sand in aluminum alloy polishing proposed in this invention.

[0022] Explanation of the labels in the diagram:

[0023] 1. First circulating pump; 2. Second circulating pump; 3. Third circulating pump; 4. Aluminum powder separator; 5. Large particle separator; 6. Small particle separator; 7. Throttling valve; 8. Visual flow meter; 9. Large particle separation tank; 10. Small particle separation tank; 11. Ultrasonic mechanical vibration system; 12. Pressure gauge; 13. Waste tank. Detailed Implementation

[0024] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0025] I. Structural Composition

[0026] The separation unit consists of a storage tank, a circulation system, a filtration unit, an ultrasonic system, a polishing abrasive particle enrichment tank, an electrical control system, a frame, and a complete sealing plate. See below for the unit's functions and dimensions. Figure 1-2 .

[0027] II. Functions of Each Component

[0028] 1. Storage tanks are used to hold liquids.

[0029] 2. The three circulating pumps constitute three independent circulating systems in this separation device.

[0030] 3. The three filtration units independently perform the functions of enriching aluminum powder, enriching large-particle polishing sand, and enriching small-particle polishing sand.

[0031] 4. Ultrasonic Mechanical Vibration System 11: The ultrasonic generator generates an ultrasonic electrical signal to supply the transducer. The transducer converts the ultrasonic electrical energy generated by the ultrasonic generator into high-frequency mechanical oscillations, which are then transmitted into the circulating medium. This mechanical vibration during the filter screen production cycle helps to clear the mesh blockage and improve separation efficiency.

[0032] 5. The bottom of the large and small polishing sand enrichment tanks is designed with a cone bottom, and there is a drain outlet at the lowest point.

[0033] 6. Electrical control section: The electrical components that centrally control the entire machine to ensure the realization of the machine's functions.

[0034] 7. Frame and outer panel: Composed of chassis, feet, components and brackets, door panels, etc. The frame is the foundation for the installation of other parts of the machine. The whole machine is made of 304 stainless steel.

[0035] More specifically, it includes the following characteristics:

[0036] The system includes a first circulation pump 1, a second circulation pump 2, a third circulation pump 3, an aluminum powder separator 4, a large particle separator 5, a small particle separator 6, a throttle valve 7, a visual flow meter 8, a large particle separation tank 9, a small particle separation tank 10, and a waste tank 13. The first circulation pump 1, aluminum powder separator 4, visual flow meter 8, waste tank 13, and their matching connecting pipes together form the first circulation loop; the second circulation pump 2, large particle separator 5, visual flow meter 8, large particle separation tank 9, waste tank 13, and their matching connecting pipes together form the second circulation loop; and the third circulation pump 3, small particle separator 6, visual flow meter 8, small particle separation tank 10, waste tank 13, and their matching connecting pipes together form the third circulation loop. The system consists of three interconnected circulation loops: the first, second, and third circulation loops. A throttle valve 7 is fixedly installed at the inlet and outlet of each circulation loop's connecting pipe. The flow rate of fluid in each pipe is distributed by adjusting the opening degree or size of the throttle valve 7. When the throttle valve 7 closes from a large to a small position, the downstream flow rate decreases, and the fluid pressure in the upstream pipe increases, correspondingly increasing the flow rate in another parallel pipe. This improves the flexibility and adaptability of the separation process, allowing for free switching and allocation between separation efficiency and accuracy. Level alarms and control systems are installed in the waste tank 13, large particle separation tank 9, and small particle separation tank 10. An ultrasonic mechanical vibration system 11 is also installed at the large particle separator 5, with an ultrasonic power of 800 W, an ultrasonic frequency of 28 kHz, and a power supply of AC380V three-phase five-wire. A pressure gauge 12 is fixedly installed on the connecting pipe between the first circulation pump 1 and the aluminum powder separator 4 to monitor the filtration operation in real time. If the pressure exceeds the set rated value, the aluminum powder filter needs to be cleaned.

[0037] The device can separate media including, but not limited to, aluminum powder, alumina, and zirconium oxide solid particles.

[0038] The device is designed with a top-bottom split and two-sided opening design, and all panels can be opened 180 degrees. Each door is connected to the frame by two symmetrical hinges. Both the panels and the frame are made of 304 stainless steel.

[0039] Waste pool 13, large particle separation pool 9, and small particle separation pool 10 all adopt a sloping bottom design. The purpose is to facilitate the flow of solid particles into the bottom outlet of the pool by gravity to the maximum extent, thereby improving separation efficiency and separation accuracy.

[0040] The design and invention of this device for separating aluminum powder and spent polishing abrasive from aluminum alloy polishing powder is based on the differences in the physical properties of the relevant media. Utilizing their density differences, pressure is applied to achieve physical filtration and separation. To address the problem of deposition and clogging in the separation media, the device employs the cavitation principle of ultrasound to generate physical vibrations. Ultrasonic cavitation produces high-speed microjets at the solid-liquid interface. Microbubbles in the liquid maintain vibration under the influence of sound waves, acting as a backwash against the filter screen and clearing blockages. Separation accuracy can be controlled by increasing the number and intensity of internal circulation. After actual operation, the device achieves a single-pass separation efficiency of over 99% for aluminum powder and over 50% for polishing abrasive particles of varying sizes. Multiple separation iterations can be performed to improve separation accuracy as needed. This device meets the design requirements and satisfies the separation needs of the production process.

[0041] In summary, the separation device of this invention overcomes the secondary pollution problem caused by the introduction of a third component in traditional wet separation for the wet separation of aluminum powder from aluminum alloy polishing and spent polishing sand. It also avoids the dust pollution, energy consumption, noise, and low efficiency problems associated with dry separation, making the recycling of polishing sand more operable and economical. The innovation of this invention lies in applying the mechanical vibration generated by ultrasound to the separation of solid particles, reducing the settling velocity of solid particles in fluid water, mitigating the negative impact of solid particle settling on filtration and separation, improving separation efficiency, making wet separation more competitive, and providing a new option for the separation of solid particles.

[0042] Based on the above design, the present invention further proposes a method for separating aluminum powder and failed polishing sand from aluminum alloy polishing, which is compatible with the separation device. Specific examples are as follows.

[0043] Example 1:

[0044] This invention relates to a method for separating aluminum powder used in aluminum alloy polishing and spent polishing abrasive (zirconia), comprising the following steps:

[0045] S1. Use the first circulation pump 1 to circulate the upper layer of waste liquid in the waste tank 13. The circulation medium is the water contained in the polishing waste liquid. Pump the waste liquid into the aluminum powder separator 4 and use the filter element in the aluminum powder separator 4 with a filtration accuracy of 1 to 5 μm to separate aluminum powder. After separation and filtration, pump the clean water back to the waste tank 13 through the connecting pipe for recycling. The aluminum powder is enriched by the filter element. Use the installed pressure gauge 12 to monitor the inlet pressure of the filter element of the aluminum powder separator 4. When the pressure reaches or exceeds the preset threshold, clean or replace the filter element of the aluminum powder filter and recover the aluminum powder.

[0046] S2. Using the second circulation pump 2, the polishing sand in the lower layer of the waste pool 13 is pumped to the large particle separator 5. The polishing sand is first filtered and separated using the stainless steel filter screen with an 80 μm pore size installed inside the large particle separator 5. The large particles are enriched and transported to the large particle separation tank 9 through fluid water, while the small particles enter the small particle collection tank with the fluid water. At the same time, the ultrasonic mechanical vibration system 11 is started to prevent the large particles from clogging the large particle separator 5. The stability of the separation process is observed by the visual flow meter 8 installed on the circulation loop pipeline, and the flow rate of each pipeline is adjusted and controlled by the throttle valve 7. The large polishing sand particles that have been separated and enriched are discharged through the bottom of the large particle collection tank for recycling.

[0047] S3. The polishing sand in the small particle separation tank 10 is separated for the second time using the third circulation pump 3. After separation by the small particle separator 6, the large particles return to the large particle separation tank 9 with the circulating water, and the small particles return to the small particle separation tank 10 for enrichment after passing through the small particle separator 6. The enrichment standard is set as needed, and the small particle polishing sand is discharged from the small particle separation tank 10 when the standard is reached, thereby achieving the purpose of separating the failed polishing sand according to the particle size.

[0048] The specific separation results are shown in Table 1.

[0049] Table 1. Separation results of zirconium oxide particles

[0050]

[0051] As shown in Table 1, the particle size and distribution of the large particles in the separated waste zirconia polishing sand are close to those of the original sand, indicating that the separation device is effective and can be used for solid particle separation. Due to the high flow resistance of solid particles, a large number of small particles will be entrained in the large particles during a single separation process. The particle size after separation can be adjusted according to actual needs by increasing the number of circulating filtration cycles.

[0052] Example 2:

[0053] Based on Example 1, but with a difference, the method for separating aluminum powder and failed polishing abrasive proposed in this invention is applicable not only to zirconium oxide, but also to polishing abrasives such as alumina, but not limited to them. The specific operating steps are the same as in Example 1, and the separation results are shown in Table 2.

[0054] Table 2. Alumina particle separation results

[0055]

[0056] As shown in Table 2, the particle size and distribution of large particles in the separated waste alumina polishing sand are similar to those of the separated zirconia polishing sand. Although alumina polishing sand and zirconia polishing sand differ significantly in appearance, with alumina polishing sand exhibiting an irregular, sharpened shape and zirconia polishing sand mainly showing an approximately spherical distribution, the separation results show the same trend. This indicates that the separation equipment can be applied to the size-based separation of different solid particle media.

[0057] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A method for separating aluminum powder and spent polishing abrasive in aluminum alloy polishing, characterized in that, Includes the following steps: S1. Use the first circulation pump (1) to circulate the upper layer of waste liquid in the waste pool (13). The circulation medium is the polishing waste liquid with its own water. Pump the waste liquid into the aluminum powder separator (4) and use the filter element in the aluminum powder separator (4) with a filtration accuracy of 1 to 5 μm to separate the aluminum powder. After the separation and filtration are completed, pump the clean water back to the waste pool (13) through the connecting pipe for recycling. The aluminum powder is enriched through the filter element. Use the installed pressure gauge (12) to monitor the inlet pressure of the filter element of the aluminum powder separator (4). When the pressure reaches or exceeds the preset threshold, clean or replace the filter element of the aluminum powder filter and recover the aluminum powder. S2. Using the second circulation pump (2), the polishing sand in the lower layer of the waste pool (13) is pumped to the large particle separator (5). The polishing sand is filtered and separated for the first time using the stainless steel filter screen with an 80 μm pore size installed inside the large particle separator (5). The large particles are enriched and transported to the large particle separation pool (9) through fluid water, while the small particles enter the small particle collection pool with the fluid water. At the same time, the ultrasonic mechanical vibration system (11) is started to prevent the large particles from clogging the large particle separator (5). The stability of the separation process is observed according to the visual flow meter (8) installed on the circulation loop pipeline, and the flow rate of each pipeline is adjusted and controlled by the throttle valve (7). The large particle polishing sand that has been separated and enriched is discharged through the bottom of the large particle collection pool for recycling. S3. Use the third circulation pump (3) to perform a second separation of the polishing sand in the small particle separation tank. After separation by the small particle separator (6), the large particles return to the large particle separation tank (9) with the circulating water, and the small particles return to the small particle separation tank for enrichment after passing through the small particle separator (6). Set the enrichment standard as needed. When the standard is reached, the small particle polishing sand is discharged from the small particle separation tank, thereby achieving the purpose of separating the failed polishing sand according to the particle size. The filter element of the aluminum powder separator (4) mentioned in S1 is designed for easy disassembly and replacement, and the principle of saturation replacement is followed during use; the filter element of the large particle separator (5) mentioned in S2 is designed with a stainless steel filter screen with an average filtration diameter of 80 μm; the filter element used in the small particle separator (6) in S3 is the same as that of the large particle separator (5). During use, small particles are discharged from the bottom of the small particle separator (6), and the mixed particles of different sizes enter the small particle separation tank with the fluid water for secondary circulation filtration and separation. An apparatus for separating aluminum powder and spent polishing sand from aluminum alloy polishing includes a first circulating pump (1), a second circulating pump (2), a third circulating pump (3), an aluminum powder separator (4), a large particle separator (5), a small particle separator (6), a throttle valve (7), a visual flow meter (8), a large particle separation tank (9), a small particle separation tank (10), an ultrasonic mechanical vibration system (11), a pressure gauge (12), and a waste tank (13); wherein, the first circulating pump (1), the aluminum powder separator (4), the visual flow meter (8), the waste tank (13), and the matching connecting pipes together form the first circulating loop; the second circulating pump (2), the large particle separator (5), the visual flow meter (8), the large particle separation tank (9), and the waste tank (13) and the matching connecting pipe together form the second circulation loop; the third circulation pump (3), small particle separator (6), visual flow meter (8), small particle separation tank, waste tank (13) and the matching connecting pipe together form the third circulation loop; the first circulation loop, the second circulation loop and the third circulation loop are interconnected, and the throttle valve (7) is fixedly installed at the inlet and outlet of the connecting pipe of each circulation loop; the waste tank (13), the large particle separation tank (9) and the small particle separation tank are all equipped with liquid level alarm and control system; the large particle separator (5) is also equipped with an ultrasonic mechanical vibration system (11); a pressure gauge (12) is fixedly installed on the connecting pipe between the first circulation pump (1) and the aluminum powder separator (4).

2. The method for separating aluminum powder and failed polishing abrasive in aluminum alloy polishing according to claim 1, characterized in that, The device can separate media including, but not limited to, aluminum powder, alumina, and zirconium oxide solid particles.

3. The method for separating aluminum powder and failed polishing abrasive for polishing aluminum alloys according to claim 1, characterized in that, The mixed waste in S1 contains fluid water, aluminum powder, and polishing abrasive. The aluminum powder particles have an average particle size greater than 5 μm, and the polishing abrasive is approximately spherical with an average particle size of 80 μm, exhibiting a normal distribution. The fluid water has a density of 1 g / cm³. 3 The density of the aluminum powder is less than 2.7 g / cm³. 3 The density of the polishing abrasive is less than 5.89 g / cm³. 3 .

4. The method for separating aluminum powder and failed polishing abrasive in aluminum alloy polishing according to claim 1, characterized in that, The small particle separator (6) used in S3 is designed with two outlets. One outlet is used to separate and enrich polishing sand with a particle size greater than or less than 80 μm and mixed particles with a diameter greater than 80 μm are returned to the large particle separation tank with the fluid water. The other outlet is used to periodically discharge particles smaller than 80 μm from the small particle separator (6) according to the enrichment quantity.

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