A device for recovering valuable metals from a precious metal refining waste liquid

Abstract

This invention relates to the field of precious metal refining waste liquid recycling and treatment technology, and discloses a device for recovering valuable metals from precious metal refining waste liquid. The device includes a main body, a mounting frame, a rotating screen section, a fixed frame, and a solid-liquid fine screening section. The main body is equipped with a primary separation tower and a secondary separation tower for series cyclone separation of the refining waste liquid, initially concentrating solid impurities and unreacted metal particles in the waste liquid. The mounting frame is equipped with multiple outer rotating screen cylinders, with an inner rotating screen cylinder coaxially arranged inside each outer screen cylinder, classifying and screening metal particles of different sizes through filter holes of different sizes. The solid-liquid fine screening section further separates the liquid containing fine metal particles by rotating a screen disc, concentrating and recovering the remaining fine metal particles. The separated liquid phase enters the subsequent metal ion enrichment process. This invention, through its multi-stage graded recovery structure, enables the effective recovery of valuable metals in different forms from refining waste liquid, improving the utilization rate of precious metal resources.

Description

Technical Field

[0001] This invention relates to the field of precious metal refining waste liquid recycling and treatment technology, and in particular to a device for recovering valuable metals from precious metal refining waste liquid. Background Technology

[0002] The refining of precious metals generates waste liquid containing valuable metal components such as gold, silver, and platinum group metals. This type of waste liquid usually contains multiple components such as dissolved metal ions, incompletely reacted metal particles, and solid impurities. Direct discharge will not only waste precious metal resources, but also increase the difficulty of subsequent waste liquid treatment. Therefore, it is necessary to recover the valuable metals in the waste liquid.

[0003] However, existing precious metal refining waste liquid recovery equipment has the following problems: 1. Existing technologies mainly target the recovery of dissolved precious metals, but lack a targeted graded recovery structure for unreacted metal particles in waste liquids, resulting in insufficient utilization of solid valuable metal resources.

[0004] 2. Existing solid-liquid separation methods are difficult to continuously separate and collect particles of different sizes, which can easily lead to the mixing of metal particles of different sizes and affect the efficiency of subsequent classification and processing. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a device for recovering valuable metals from precious metal refining waste liquid, which solves the problems mentioned in the background art regarding the insufficient recovery of solid valuable metals from refining waste liquid, the difficulty in classifying and collecting metal particles of different sizes, and the easy loss of small-sized metal particles with the waste liquid.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A device for recovering valuable metals from precious metal refining waste liquid includes: The machine body is equipped with a primary separation tower and a secondary separation tower. The primary separation tower is provided with a waste liquid connecting pipe. An overflow connecting pipe connects the primary separation tower and the secondary separation tower. An overflow output pipe is provided at the top of the secondary separation tower. The bottoms of the primary separation tower and the secondary separation tower are respectively connected to a primary collection tank and a secondary collection tank. The mounting frame is located on one side of the machine body. The mounting frame is equipped with multiple outer roller screens. The primary collection tank and the secondary collection tank are respectively connected to the multiple outer roller screens through conveying pipes. A fixing frame is provided on one side of the outer roller screens, and a rotating screen plate is installed on the fixing frame. Multiple rotating screening sections are mounted on a mounting frame, and each rotating screening section includes a first auger for bidirectional separation and collection of metal particles of different sizes from a conveying pipe; The solid-liquid fine screening section is mounted on a fixed frame and is used to drive the rotating screen to separate the liquid from small metal particles, which facilitates the subsequent enrichment of metal ions in the separated waste liquid.

[0007] Furthermore, the waste liquid connecting pipe is tangentially arranged with the primary separation tower, and the end of the overflow connecting pipe away from the primary separation tower is tangentially arranged with the secondary separation tower.

[0008] Furthermore, the mounting frame is provided with multiple limiting rollers, the outer roller screen cylinder is provided with multiple limiting grooves, the outer roller screen cylinder is rotatably connected to the mounting frame through the limiting grooves, the inner roller screen cylinder is coaxially provided inside the outer roller screen cylinder, and multiple filter holes are provided on both the outer roller screen cylinder and the inner roller screen cylinder.

[0009] Furthermore, the inner roller screen is fixedly mounted on the mounting frame, and a rotating shaft is coaxially provided inside the inner roller screen. The rotating shaft is rotatably connected to the conveying pipe. A communicating cavity is provided at one end of the rotating shaft near the conveying pipe. Multiple liquid outlet holes are opened at the other end of the rotating shaft near the conveying pipe, and all of the multiple liquid outlet holes are connected to the communicating cavity. A first spiral auger is coaxially fixedly connected to the inner roller screen, and a second spiral auger is coaxially fixedly connected to the rotating shaft.

[0010] Furthermore, the rolling screening unit also includes: A drive motor is fixedly mounted on the mounting frame. The output end of the drive motor is coaxially fixedly connected to a drive bevel gear. The inner roller screen cylinder is coaxially fixedly connected to a bevel gear one. The rotating shaft is coaxially fixedly connected to a bevel gear two. The two ends of the drive bevel gear mesh with bevel gear one and bevel gear two respectively for transmission. A U-shaped fixing frame is provided between the driving bevel gear and bevel gear one and bevel gear two, and a sealing ring plate is provided at the end of the outer roller screen cylinder near the driving motor.

[0011] Furthermore, the mounting frame is provided with a collection trough, which is located below the outer roller screen cylinder. The bottom of the collection trough is connected to an infusion pipe, and the end of the infusion pipe away from the collection trough is located above the rotating screen plate.

[0012] Furthermore, a small particle metal collection pool is provided below the end of the outer roller screen cylinder near the conveying pipe, and a large particle metal collection pool is provided below the end of the outer roller screen cylinder near the drive motor.

[0013] Furthermore, a rotating motor is fixedly installed on the fixed frame, and multiple spiral grooves are formed on the rotating screen in a circumferential array. A connecting hole is formed in the center of the rotating screen. One end of the spiral groove is connected to the connecting hole, and the other end is in contact with the outer diameter edge of the rotating screen. A discharge pipe is coaxially provided in the connecting hole, and a collection trough is provided below the discharge pipe. The rotating screen is inclinedly arranged on the fixed frame, and a liquid collection trough is provided below the rotating screen.

[0014] Furthermore, the solid-liquid fine screening section includes: A fixed mounting component is fixedly installed on the fixed frame. The output end of the rotating motor is rotatably connected to the fixed mounting component. A driving spur gear is coaxially fixedly connected to the output end of the rotating motor. The driving spur gear meshes with a driven spur gear. The rotating screen is coaxially fixedly connected to the driven spur gear. The driven spur gear is rotatably connected to the fixed mounting component.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention forms a series cyclone separation structure by setting up a primary separation tower and a secondary separation tower, so that the precious metal refining waste liquid entering the device undergoes continuous cyclone treatment, realizing the initial separation of solid impurities, unreacted metal particles and liquid components, reducing the impact of impurities on the subsequent recovery process, and solving the problem that solid valuable metals are easily lost with the waste liquid in the prior art.

[0016] 2. This invention, by setting up an inner roller screen, an outer roller screen, and a rolling screening section, uses filter holes of different sizes to classify and screen metal particles of different sizes, and then transports them to the corresponding collection areas by a first spiral auger and a second spiral auger, respectively, to achieve the classified recycling of coarse and fine metal particles, thus solving the problem in the prior art that it is difficult to collect metal particles of different sizes separately.

[0017] 3. This invention, by setting up a solid-liquid fine screening section, further separates the metal-containing waste liquid from the collection tank, allowing for the centralized recovery of residual fine metal particles; the mainstream waste liquid led out by the overflow outlet pipe can be sent to the rolling screening section through branch pipes to participate in screening, reducing the loss of fine metal particles in the mainstream waste liquid; the separated liquid phase can enter the subsequent metal ion enrichment treatment process, improving the overall resource utilization rate of precious metal refining waste liquid and solving the problems of single treatment path and insufficient recovery in existing recycling equipment. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of a valuable metal recovery device for precious metal refining waste liquid proposed in this invention. Figure 2 This is a schematic diagram of the overall structure of a valuable metal recovery device from precious metal refining waste liquid proposed in this invention from another perspective. Figure 3 This is a top view of the installation structure of the body and separation tower of a precious metal recovery device for precious metal refining waste liquid proposed in this invention; Figure 4 for Figure 3 A cross-sectional view along the AA direction; Figure 5 This is a schematic diagram of the rolling screen section structure of a precious metal recovery device for precious metal refining waste liquid proposed in this invention; Figure 6 for Figure 5 Top view; Figure 7 for Figure 6 A cross-sectional view along the BB direction; Figure 8 for Figure 7 Enlarged diagram of section A in the middle; Figure 9 This is a schematic diagram of the rotating screen structure of a precious metal recovery device for precious metal refining waste liquid proposed in this invention; Figure 10 This is a schematic diagram of the solid-liquid fine screening section of a precious metal recovery device for precious metal refining waste liquid proposed in this invention.

[0019] Explanation of the labels in the diagram: 1. Main body; 11. Primary separation tower; 12. Secondary separation tower; 13. Waste liquid connecting pipe; 14. Overflow connecting pipe; 15. Overflow output pipe; 16. Primary collection tank; 17. Secondary collection tank; 18. Conveying pipe; 2. Mounting frame; 21. Outer roller screen cylinder; 22. Filter holes; 23. Limiting roller groove; 24. Limiting roller; 25. Collection tank; 251. Infusion tube; 26. Large particle metal collection tank; 27. Small particle metal collection tank; 28. Inner roller screen cylinder; 281. First spiral auger; 3. Rolling screen section; 31. Drive motor; 32. Drive bevel gear; 33. Bevel gear one; 34. Bevel gear two; 4. Fixed frame; 41. Rotating motor; 42. Rotating screen plate; 421. Spiral groove; 43. Connecting hole; 44. Discharge pipe; 45. Collection trough; 46. Liquid collection trough; 5. Solid-liquid fine screening section; 51. Fixed mounting component; 52. Driving spur gear; 53. Driven spur gear; 6. Rotating shaft; 61. Connecting cavity; 611. Liquid outlet; 62. Second spiral auger. Detailed Implementation

[0020] 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. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0021] Example 1, please refer to Figures 1 to 10 This is the first embodiment of the present invention. This embodiment provides a valuable metal recovery device for precious metal refining waste liquid, which is used to treat the valuable metal-containing waste liquid generated during the precious metal refining process. This device improves the recovery efficiency of precious metal resources by diverting the valuable metal components in different states in the waste liquid, so that solid metal particles and liquid metal components enter the corresponding treatment paths respectively.

[0022] The device in this embodiment includes a body 1, a mounting frame 2, a rotating screening section 3, a fixing frame 4, and a solid-liquid fine screening section 5. The body 1 serves as the primary treatment unit for the waste liquid, and its interior is equipped with a primary separation tower 11 and a secondary separation tower 12. The primary separation tower 11 and the secondary separation tower 12 are arranged sequentially along the flow direction of the waste liquid, and are used to continuously separate the precious metal refining waste liquid entering the device through cyclone separation.

[0023] During operation, the refining waste liquid containing valuable metals first enters the primary separation tower 11 through the waste liquid connecting pipe 13. The waste liquid connecting pipe 13 is tangentially connected to the side wall of the primary separation tower 11, so that the waste liquid entering the primary separation tower 11 forms a rotating flow state.

[0024] Because the waste liquid contains solid impurities, incompletely reacted metal particles, and liquid components, components with different densities and particle sizes are subjected to centrifugal force and fluid resistance during the rotating flow process, resulting in different motion states.

[0025] Among them, solid impurities with larger particle size and higher density, as well as some coarse solid materials, gradually move towards the inner wall of the primary separation tower 11 and move downward with the outer swirling flow, eventually entering the primary collection pool 16 for temporary storage.

[0026] Meanwhile, the liquid phase in the central region and the fine metal particles that are not fully separated move upward with the internal swirling flow and enter the secondary separation tower 12 through the overflow connecting pipe 14 located between the primary separation tower 11 and the secondary separation tower 12.

[0027] The overflow connecting pipe 14 is also connected to the secondary separation tower 12 in a tangential manner, so that the treatment liquid entering the secondary separation tower 12 will once again form a rotating flow state.

[0028] After the second cyclone separation, the remaining solid particles are further affected by centrifugal force. The larger particles sink downward and enter the secondary collection tank 17, while the liquid phase after further separation is output through the overflow outlet pipe 15 at the top of the secondary separation tower 12.

[0029] By connecting the primary separation tower 11 and the secondary separation tower 12 in series, the waste liquid undergoes two cyclone separation processes, achieving the initial concentration of solid impurities and solid metal particles, while reducing the impurity content entering the subsequent screening process.

[0030] Example 2, as Figures 5 to 8 As shown, this is the second embodiment of the present invention. Unlike the previous embodiment, based on embodiment 1, this embodiment further describes the treatment process of the sediments in the primary collection tank 16 and the secondary collection tank 17 and the treatment liquid after entering the rolling screen section 3.

[0031] The primary collection tank 16 and the secondary collection tank 17 are respectively connected to multiple rolling screen sections 3 on the mounting frame 2 through the conveying pipe 18, so that the solid-liquid mixture formed after cyclone separation can enter the subsequent screening area.

[0032] The rotating screening unit 3 includes an outer rotating screen cylinder 21, an inner rotating screen cylinder 28, and a drive structure. The mounting frame 2 is provided with a limiting roller 24, and the outer rotating screen cylinder 21 is provided with a limiting groove 23 on its outer side. The outer rotating screen cylinder 21 cooperates with the limiting roller 24 through the limiting groove 23, so that the outer rotating screen cylinder 21 can rotate relative to the mounting frame 2.

[0033] An inner roller screen cylinder 28 is coaxially arranged inside the outer roller screen cylinder 21, and the inner roller screen cylinder 28 is fixedly installed on the mounting frame 2. Both the inner roller screen cylinder 28 and the outer roller screen cylinder 21 are provided with filter holes 22, wherein the diameter of the filter holes 22 on the inner roller screen cylinder 28 is larger than the diameter of the filter holes 22 on the outer roller screen cylinder 21.

[0034] When the solid-liquid mixture enters the inner roller screen cylinder 28, the liquid can first flow out through the filter holes 22 on the inner roller screen cylinder 28, while the larger unreacted metal particles are confined inside the inner roller screen cylinder 28 because their size is larger than the filter holes 22.

[0035] The liquid and smaller metal particles after being screened by the inner roller screen 28 continue to enter the outer roller screen 21 area. The smaller metal particles are intercepted by the filter holes 22 on the outer roller screen 21, while the liquid continues to flow into the collection tank 25 below through the filter holes 22.

[0036] The rolling screening unit 3 is powered by a drive motor 31. The output end of the drive motor 31 is connected to a drive bevel gear 32, which meshes with bevel gear 33 and bevel gear 34 respectively.

[0037] The first bevel gear 33 is connected to the inner roller screen cylinder 28, and the second bevel gear 34 is connected to the rotating shaft 6. By driving the bevel gear 32, the corresponding structures of the inner roller screen cylinder 28 and the rotating shaft 6 move in different directions. The rotating shaft 6 is located inside the inner roller screen cylinder 28. The rotating shaft 6 has a connecting cavity 61 inside and the liquid is discharged through the liquid outlet hole 611.

[0038] A second spiral auger 62 is fixedly connected to the rotating shaft 6; when the rotating shaft 6 rotates, the second spiral auger 62 pushes the large metal particles trapped inside the inner roller screen cylinder 28 to move axially, so that they enter the large metal collection pool 26.

[0039] Meanwhile, since the inner roller screen cylinder 28 is fixedly installed on the mounting frame 2, and the first spiral auger 281 set on the inner roller screen cylinder 28 remains fixed, during the rotation of the outer roller screen cylinder 21, the small metal particles trapped inside the outer roller screen cylinder 21 are affected by the rotational motion and gradually move to the small metal particle collection pool 27 under the guidance of the first spiral auger 281.

[0040] The above structure allows solid metal particles of different sizes to be collected separately, avoiding the mixing and output of metals of different sizes in traditional screening methods.

[0041] Example 3, as Figure 9 and Figure 10 As shown, this is the third embodiment of the present invention. Based on the above embodiments, this embodiment further illustrates the working process of the solid-liquid fine screening section 5.

[0042] The liquid, after being screened by the outer roller screen 21 and the inner roller screen 28, enters the collection tank 25. A liquid delivery pipe 251 is installed at the bottom of the collection tank 25, which is used to transport the liquid containing fine metal particles to the rotating screen plate 42. A rotating motor 41 is installed on the fixed frame 4, and the rotating motor 41 drives the rotating screen plate 42 to rotate through the solid-liquid fine screening section 5.

[0043] The solid-liquid fine screening section 5 includes a fixed mounting part 51, a driving spur gear 52 and a driven spur gear 53. The output end of the rotating motor 41 is connected to the fixed mounting part 51 and drives the driving spur gear 52 to rotate. The driving spur gear 52 meshes with the driven spur gear 53, causing the rotating screen disk 42 to rotate. The rotating screen disk 42 is inclinedly arranged on the fixed frame 4, and its surface is provided with a plurality of spiral grooves 421 distributed along the circumferential direction.

[0044] After the waste liquid containing fine metal particles enters the rotating screen 42, under the influence of rotation and the inclined structure, the liquid flows outward along the surface of the screen and enters the collection tank 46 below. Meanwhile, the fine metal particles with higher density are affected by the centrifugal force of rotation and gradually move towards the central area along the spiral groove 421.

[0045] When the metal particles move to the position of the connecting hole 43, they enter the collection tank 45 through the discharge pipe 44, realizing the centralized collection of fine metal particles. The liquid after being processed by the solid-liquid fine screening section 5 enters the subsequent metal ion enrichment process, thereby realizing the separation of solid metal particle recovery and liquid metal ion treatment.

[0046] Under actual operating conditions, the mainstream waste liquid flowing out from the overflow outlet pipe 15 may still carry some fine solid metal particles that have not been intercepted by the cyclone separation. If it is directly sent into the subsequent metal ion enrichment process, it will cause the loss of these valuable solid metal particles.

[0047] As a further preferred embodiment of this device, a branch pipe can be added to the overflow output pipe 15. The branch pipe is connected to the conveying pipe 18 and connected to the inside of the inner roller screen cylinder 28, so that the mainstream waste liquid discharged from the overflow output pipe 15 is also transported into the inner roller screen cylinder 28 to participate in the grading and screening operation of the rolling screening section.

[0048] Therefore, the sedimented solid-liquid mixture discharged from the primary collection tank 16 and the secondary collection tank 17, as well as the mainstream waste liquid led out from the overflow outlet pipe 15, can all enter the double-layer rotary screen screening process, further reducing the risk of direct loss of fine solid metal particles. This branch pipeline can be equipped with a switching valve group. During the production process, the feeding passage from the overflow outlet pipe 15 to the rotary screen section can be opened or closed according to the on-site solid content detection results of the waste liquid. When the solid particle content in the overflow liquid is low, the branch pipeline can be closed, and the waste liquid from the overflow outlet pipe 15 can be directly transported to the subsequent metal ion enrichment process, reducing the processing load of the screening unit.

[0049] The precious metal refining waste liquid contains a large number of solid metal particles of different sizes. Under long-term continuous industrial processing conditions, the filter holes 22 of the outer roller screen cylinder 21 and the inner roller screen cylinder 28 are prone to particle blockage. The assembly gap between the inner and outer roller screen cylinders is also prone to trapping metal debris. At the same time, the spiral groove 421 of the rotating screen plate 42 will continuously deposit and enrich fine metal particles during continuous operation. Long-term operation will reduce the processing efficiency of screening and centrifugal separation.

[0050] As a preferred embodiment, this device can be equipped with a matching flushing and anti-clogging maintenance component: multiple sets of high-pressure flushing spray components are arranged inside and outside the outer roller screen cylinder 21 and the inner roller screen cylinder 28, respectively. The high-pressure flushing spray components are connected to the cleaning medium pipeline. Under the condition of intermittent equipment shutdown or low load online state, the filter holes 22 of the inner roller screen cylinder 28 and the outer roller screen cylinder 21 are flushed with high pressure to remove metal particles stuck in the filter holes and the gaps between the inner and outer screen cylinders. The flushed material flows downward into the collection tank 25 and is sent to the solid-liquid fine screening section 5 through the liquid delivery pipe 251 to complete the recovery.

[0051] A corresponding spray rinsing component is also configured for the spiral groove 421 on the rotating screen plate 42. The spray component is arranged facing the spiral groove 421 channel. During the equipment shutdown and material discharge stage, the spray is turned on to flush and push the metal particles deposited in the spiral groove 421 channel, so that they flow along the spiral groove 421 to the central connecting hole 43, and enter the collection tank 45 through the discharge pipe 44 to complete the collection. The liquid phase generated by rinsing falls into the liquid collection tank 46.

[0052] By adding the aforementioned flushing and maintenance support structure, the problems of material jamming in the screen holes and material accumulation in the spiral groove are alleviated, adapting to the needs of long-term continuous operation in industrial sites and reducing the probability of clogging failures. It should be noted that this flushing and anti-clogging component is a preferred additional structure of the present invention and is not a necessary technical feature for realizing the core graded recycling function of this device. In laboratory-scale intermittent operation, manual cleaning can also be used to complete the unclogging operation of the screen cylinder and screen plate.

[0053] When this device is in operation, the precious metal refining waste liquid first enters the primary separation tower 11, where the first solid-liquid separation is completed through swirling action.

[0054] The liquid phase after primary separation enters the secondary separation tower 12 for further separation, which further concentrates the solid impurities and unreacted metal particles in the waste liquid. Subsequently, the sediments in the primary collection tank 16 and the secondary collection tank 17, as well as the corresponding treated liquid, enter the rolling screen section 3 through the conveying pipe 18.

[0055] The rolling screening section 3 utilizes the different filter hole sizes 22 of the inner rolling screen cylinder 28 and the outer rolling screen cylinder 21 to achieve the classification and screening of metal particles of different sizes. Among them, large metal particles are transported to the large metal collection tank 26 through the second spiral auger 62, and small metal particles are transported to the small metal collection tank 27 through the first spiral auger 281. The remaining liquid containing fine metal particles enters the solid-liquid fine screening section 5, where the solid metal particles and liquid are further separated by rotating the screen plate 42.

[0056] Ultimately, this device forms a continuous processing procedure consisting of waste liquid cyclone separation, solid particle classification and screening, metal particle classification and collection, residual particle fine screening, and subsequent enrichment of liquid metal ions.

[0057] This invention sets up corresponding treatment structures for different forms of valuable metals in precious metal refining waste liquid, so that both solid metal particles and liquid metal components can be effectively utilized, thereby improving the recovery efficiency of precious metal resources and having good industrial application value.

[0058] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A device for recovering valuable metals from precious metal refining waste liquid, characterized in that, include: The machine body (1) is equipped with a primary separation tower (11) and a secondary separation tower (12). The primary separation tower (11) is provided with a waste liquid connecting pipe (13). An overflow connecting pipe (14) is connected between the primary separation tower (11) and the secondary separation tower (12). An overflow output pipe (15) is provided at the top of the secondary separation tower (12). The primary collection tank (16) and the secondary collection tank (17) are respectively connected to the bottom of the primary separation tower (11) and the secondary separation tower (12). Mounting frame (2), the mounting frame (2) is set on one side of the machine body (1), the mounting frame (2) is provided with multiple outer roller screen cylinders (21), the primary collection tank (16) and the secondary collection tank (17) are respectively connected to the multiple outer roller screen cylinders (21) by conveying pipes (18), the outer roller screen cylinders (21) are provided with a fixing frame (4) on one side, and a rotating screen plate (42) is installed on the fixing frame (4). Multiple rotating screening sections (3) are mounted on a mounting frame (2). The rotating screening section (3) includes a first spiral auger (281) for bidirectional separation and collection of metal particles of different sizes from the conveying pipe (18). Solid-liquid fine screening section (5) is set on the fixed frame (4). The solid-liquid fine screening section (5) is used to drive the rotating screen plate (42) to rotate to separate the liquid from the small metal particles, which facilitates the subsequent enrichment of metal ions in the separated waste liquid.

2. The device for recovering valuable metals from precious metal refining waste liquid according to claim 1, characterized in that, The waste liquid connecting pipe (13) is tangentially arranged with the primary separation tower (11), and the end of the overflow connecting pipe (14) away from the primary separation tower (11) is tangentially arranged with the secondary separation tower (12).

3. The device for recovering valuable metals from precious metal refining waste liquid according to claim 1, characterized in that, The mounting frame (2) is provided with multiple limiting rollers (24), and the outer roller screen cylinder (21) is provided with multiple limiting grooves (23). The outer roller screen cylinder (21) is rotatably connected to the mounting frame (2) through the limiting grooves (23). The inner roller screen cylinder (28) is coaxially provided inside the outer roller screen cylinder (21). Both the outer roller screen cylinder (21) and the inner roller screen cylinder (28) are provided with multiple filter holes (22).

4. The device for recovering valuable metals from precious metal refining waste liquid according to claim 3, characterized in that, The inner roller screen (28) is fixedly installed on the mounting frame (2). The inner roller screen (28) is coaxially provided with a rotating shaft (6). The rotating shaft (6) is rotatably connected to the conveying pipe (18). The end of the rotating shaft (6) near the conveying pipe (18) is provided with a connecting cavity (61). The end of the rotating shaft (6) near the conveying pipe (18) is provided with multiple liquid outlet holes (611). The multiple liquid outlet holes (611) are all connected to the connecting cavity (61). The inner roller screen (28) is coaxially fixedly connected with a first spiral auger (281). The rotating shaft (6) is coaxially fixedly connected with a second spiral auger (62).

5. A device for recovering valuable metals from precious metal refining waste liquid according to claim 4, characterized in that, The rolling screening section (3) further includes: A drive motor (31) is fixedly installed on the mounting bracket (2). The output end of the drive motor (31) is coaxially fixedly connected to a drive bevel gear (32). The inner roller screen cylinder (28) is coaxially fixedly connected to a bevel gear one (33). The rotating shaft (6) is coaxially fixedly connected to a bevel gear two (34). The two ends of the drive bevel gear (32) mesh with bevel gear one (33) and bevel gear two (34) respectively for transmission. A U-shaped fixing frame is provided between the driving bevel gear (32) and bevel gear one (33) and bevel gear two (34), and a sealing ring plate is provided at the end of the outer roller screen cylinder (21) near the driving motor (31).

6. The device for recovering valuable metals from precious metal refining waste liquid according to claim 1, characterized in that, The mounting bracket (2) is provided with a collection trough (25), which is located below the outer roller screen cylinder (21). The bottom of the collection trough (25) is connected to an infusion pipe (251), and the end of the infusion pipe (251) away from the collection trough (25) is located above the rotating screen plate (42).

7. A device for recovering valuable metals from precious metal refining waste liquid according to claim 5, characterized in that, The outer roller screen (21) has a small particle metal collection pool (27) located below the end near the conveying pipe (18), and a large particle metal collection pool (26) located below the end near the drive motor (31).

8. A device for recovering valuable metals from precious metal refining waste liquid according to claim 1, characterized in that, A rotating motor (41) is fixedly installed on the fixed frame (4). Multiple spiral grooves (421) are arranged in a circular array on the rotating screen (42). A connecting hole (43) is provided in the center of the rotating screen (42). One end of the spiral groove (421) is connected to the connecting hole (43), and the other end is in contact with the outer diameter edge of the rotating screen (42). A discharge pipe (44) is coaxially provided in the connecting hole (43). A collection trough (45) is provided below the discharge pipe (44). The rotating screen (42) is inclinedly arranged on the fixed frame (4). A liquid collection trough (46) is provided below the rotating screen (42).

9. A device for recovering valuable metals from precious metal refining waste liquid according to claim 8, characterized in that, The solid-liquid fine screening section (5) includes: A fixed mounting component (51) is fixedly installed on the fixed frame (4). The output end of the rotating motor (41) is rotatably connected to the fixed mounting component (51). The output end of the rotating motor (41) is coaxially fixedly connected to a driving spur gear (52). The driving spur gear (52) meshes with a driven spur gear (53). The rotating screen (42) is coaxially fixedly connected to the driven spur gear (53). The driven spur gear (53) is rotatably connected to the fixed mounting component (51).

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