A method and device for recovering iridium from iridium-containing waste

Abstract

The present invention relates to the technical field of precious metal recovery, and particularly relates to a method and device for recovering iridium from iridium-containing waste. The specific technical solution is as follows: A method for recovering iridium from iridium-containing waste. In the device for recovering iridium, high pressure and a mixed solution of hydrochloric acid and hydrogen peroxide are used to impact the iridium-containing waste, and the mixed solution dissolved with iridium after the impact is returned to the above-mentioned part for re-impact; after multiple impacts are completed, the iridium-containing waste is soaked in the mixed solution for 1 to 2 hours; after soaking is completed, the iridium-containing mixed solution is transported to a digestion tank for microwave digestion. After digestion is completed, iridium is precipitated by adding a precipitating agent, and after multiple washings, filtrations and drying, an iridium-containing precipitate is obtained. The present invention recovers iridium on the iridium-containing waste through a combination of physical and chemical methods, greatly saving the treatment time and improving the treatment efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of precious metal recovery, and particularly relates to a method and device for recovering iridium from iridium-containing waste. Background Art

[0002] Iridium electrodes have high electrical conductivity and corrosion resistance and are commonly used in industrial processes such as electrolysis, electroplating, and batteries. Similarly, when the equipment used in these industrial processes is scrapped, the iridium electrodes therein become waste. The recovery of iridium electrode waste is a complex but important process, and chemical, smelting, biological, and physical methods can be used to recover iridium. However, the chemical method is suitable for waste with a low iridium content, and moreover, the reagents used in the recovery pollute the environment to a certain extent. The smelting method is to make the waste interact with a flux at high temperature and separate iridium after cooling. However, this method is suitable for waste with a high iridium purity, and moreover, it has high energy consumption and high requirements for the operating environment. The biological method is to use microorganisms or plants to biosorb or reduce iridium in the waste. However, the recovery efficiency may be affected by various factors, such as the adsorption capacity of the organisms. At the same time, the biological method may face problems such as a long treatment cycle and low efficiency when dealing with a large amount of iridium waste. The physical method is to use high-pressure water flow to impact iridium out of the waste and is suitable for waste containing metal iridium particles. However, this method may not be able to completely separate all iridium particles and requires further purification treatment. Based on the above problems, the present invention uses a combination of physical and chemical methods to preliminarily recover iridium from iridium electrode waste. Summary of the Invention

[0003] In view of the deficiencies of the prior art, the present invention provides a method and device for recovering iridium from iridium-containing waste.

[0004] To achieve the above objectives, the present invention is realized through the following technical solutions:[[]]

[0005] The present invention discloses a method for recovering iridium from iridium-containing waste. In the device for recovering iridium, high pressure and a mixed solution of hydrochloric acid and hydrogen peroxide are used to impact the iridium-containing waste, and the mixed solution dissolved with iridium after the impact is returned to the above part for re-impact; after multiple impacts are completed, the iridium-containing waste is soaked in the mixed solution for 1-2 h; after soaking is completed, the iridium-containing mixed solution is transported to a digestion tank for microwave digestion. After digestion is completed, iridium is precipitated by adding a precipitant, and after multiple washings, filtrations, and drying, an iridium-containing precipitate is obtained.

[0006] Preferably, the concentration of the hydrochloric acid is 5-15%, and the volume ratio of the hydrochloric acid to the hydrogen peroxide is 1:1.

[0007] Preferably, the power of the microwave digestion is 1500 W, the temperature is 220°C - 285°C, the time is ≤1 h, and the pressure is 15-18 MPa.

[0008] Correspondingly, a device for recovering iridium from iridium-containing waste includes a box body. A dissolution tank is horizontally arranged inside the box body. A feed inlet is arranged at the top of the dissolution tank. Guide plates are arranged on both sides of the feed inlet. The guide plates are fixed to the box body and are arranged away from the feed inlet. A hollow shaft is coaxially arranged inside the dissolution tank. Both ends of the hollow shaft sequentially extend out of the dissolution tank and the box body and are fixed to the box body and the dissolution tank through bearings. A plurality of nozzles are arranged at the bottom of the hollow shaft. A drain pipe is arranged at the bottom of the dissolution tank. Both ends of the hollow shaft are respectively connected with a return pipe and a feed pipe. The feed pipe is connected to a reagent tank. The return pipe is connected to the drain pipe. A first pump is arranged on the return pipe. The drain pipe is connected to a digestion tank, and the digestion tank is connected to a precipitation tank.

[0009] Preferably, a first gear is sleeved on the end of the hollow shaft extending out of the box body. A rack meshing with the first gear is slidably arranged outside the box body, and the rack is driven by a first telescopic member.

[0010] Preferably, a sleeve is sleeved on the other end of the hollow shaft. The sleeve passes through the box body and is fixed to the end face of the dissolution tank. The sleeve is fixed to the box body through a bearing. A second gear is fixedly sleeved outside the sleeve, and the second gear is driven by a first motor.

[0011] Preferably, a stirring frame is arranged at the bottom of the hollow shaft inside the dissolution tank. The stirring frame includes corresponding support rods. The support rods are arranged at the bottom of the hollow shaft near both ends of the dissolution tank. A connecting rod is arranged between the support rods, and a scraping strip contacting the inner wall of the dissolution tank is arranged at the bottom of the connecting rod.

[0012] Preferably, a second pump is arranged on the drain pipe. A multi-way pipe joint is arranged at the outlet of the drain pipe. Each outlet of the multi-channel pipe joint is connected to a digestion chamber on the digestion tank through a pipeline. A one-way valve is arranged at the connection between the digestion chamber and the pipeline. An exhaust pipe is arranged on the digestion chamber, and a valve is arranged on the exhaust pipe. A valve is arranged at the outlet of the digestion chamber. A liquid outlet pipe is connected to the valve, and a third pump is arranged on the liquid outlet pipe. The outlet end of the liquid outlet pipe is connected to the precipitation tank.

[0013] Preferably, a liftable filter screen plate is arranged inside the precipitation tank. A tank door is arranged on the side wall of the precipitation tank. The end of the liquid outlet pipe extending into the precipitation tank is bent downward. A liftable stirrer is arranged inside the precipitation tank. A solvent pipe and a water inlet pipe are connected to the precipitation tank;

[0014] The filter plate is square, and a fixing frame in the shape of "┓" is arranged on three side walls thereof, and the horizontal part of the fixing frame is arranged outward. A limiting frame is arranged outside the fixing frame. One side of the limiting frame is open. An "L"-shaped platform adapted to the fixing frame is arranged on the inner wall of the limiting frame, and the platform and the top surface of the limiting frame are inclined planes facing the inside of the limiting frame.

[0015] Preferably, screw holes are arranged on two opposite sides of the limiting frame, screw rods are fitted in the screw holes, a second motor is arranged at one end of the screw rod extending out of the top of the sedimentation tank, the other end of the screw rod is fixed to the inner bottom of the sedimentation tank through a bearing, guide posts are arranged on the outer wall of the limiting frame, and guide grooves adapted to the guide posts are arranged on the inner wall of the sedimentation tank;

[0016] The stirrer includes a second telescopic member vertically arranged in the sedimentation tank. A mixing plate is horizontally arranged at the output end of the second telescopic member, and a plurality of through holes are arranged on the mixing plate.

[0017] The present invention has the following beneficial effects:

[0018] In the present invention, in the dissolution tank, a mixed solution of hydrochloric acid and hydrogen peroxide is used to dissolve iridium in the iridium-containing waste. At the same time, by arranging a hollow shaft and a nozzle, the mixed solution is sprayed on the waste under a certain pressure to impact the iridium in the waste, and the iridium in the waste is combined with the dissolution of the mixed solution to maximize the separation of iridium and dissolution in the mixed solution. During this process, by driving the rotation of the hollow shaft and returning the sprayed mixed solution to the hollow shaft for circulating spraying, the iridium on the waste is more fully separated and dissolved. The present invention recovers iridium on the iridium-containing waste by combining physical and chemical methods, greatly saving the treatment time and improving the treatment efficiency. Moreover, hydrochloric acid and hydrogen peroxide are used instead of hydrochloric acid-potassium chlorate, eliminating the pollution and safety hazards brought by salts and making the treatment more environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a schematic structural diagram of the present invention;

[0020] Figure 2 is Figure 1 the view in the direction of A-A in

[0021] Figure 3 is one of the implementation diagrams of the cooperation between the first gear and the rack;

[0022] Figure 4 is Figure 1 the view in the direction of B-B in

[0023] Figure 5 is Figure 4 the view in the direction of C-C in

[0024] Figure 6 Schematic diagram of the limit frame;

[0025] Figure 7 Schematic diagram of the filter screen plate;

[0026] In the figure: box body 1, dissolution tank 2, feed inlet 3, guide plate 4, hollow shaft 5, nozzle 6, drain pipe 7, return pipe 8, liquid inlet pipe 9, first pump 10, digestion tank 11, precipitation tank 12, first gear 13, rack 14, first telescopic member 15, sleeve 16, second gear 17, support rod 18, connecting rod 19, scraping bar 20, second pump 21, multi-way pipe joint 22, pipeline 23, exhaust pipe 24, liquid outlet pipe 25, third pump 26, filter screen plate 27, tank door 28, solvent pipe 29, water inlet pipe 30, fixing frame 31, limit frame 32, platform 33, screw hole 34, screw 35, second motor 36, guide post 37, guide groove 38, second telescopic member 39, mixing plate 40, spray hole 41, retaining bar 42. Specific embodiments

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0028] If not specifically specified, the technical means used in the implementation examples are conventional means well known to those skilled in the art.

[0029] The present invention discloses a method for recovering iridium from iridium-containing waste. The whole process is carried out in a device for recovering iridium. A high pressure and a mixed solution of hydrochloric acid and hydrogen peroxide are used to impact the iridium-containing waste. During the impact process, the iridium-containing waste can be selectively stirred, and the mixed solution containing dissolved iridium after the impact is returned to the above part for re-impact. Specifically: as the liquid in the device gradually increases during the impact process and submerges the iridium-containing waste, at this time, the liquid will cause a certain resistance and affect the impact effect. Therefore, during the impact process, the liquid is simultaneously returned to the previous step for impact operation to lower the liquid level in the device; after multiple impacts are completed, the iridium-containing waste is soaked in the mixed solution for 1-2 h; after soaking, the iridium-containing mixed solution is transported to a digestion tank for microwave digestion. After digestion is completed, iridium is precipitated by adding a precipitant, and after multiple washings, filtrations, and drying, iridium-containing precipitates are obtained. It should be noted that: the iridium-containing waste is an iridium-containing electrode material. Before recovering the iridium above, the iridium-containing electrode material is crushed to a length of 1-10 cm to avoid blockage during the stirring process of the iridium-containing waste.

[0030] Furthermore, the concentration of the hydrochloric acid is 5-15%, and the volume ratio of the hydrochloric acid to the hydrogen peroxide is 1:1. The dosage of the mixed solution of hydrochloric acid and hydrogen peroxide is based on submerging the iridium-containing waste in the device.

[0031] Furthermore, the power of the microwave digestion is 1500 W, the temperature is 220°C - 285°C, the time is ≤1 h, and the pressure is 15 - 18 MPa.

[0032] Reference Figures 1 - 7 , the present invention discloses a device for recovering iridium from iridium-containing waste, including a box body 1 with an open top. A dissolution tank 2 is horizontally arranged inside the box body 1. A feed inlet 3 is arranged at the top of the dissolution tank 2. Guide plates 4 are arranged on both sides of the feed inlet 3. The guide plates are inclined. The guide plates 4 are fixed to the box body 1 through reinforcing plates. One end of the guide plate is arranged away from the feed inlet 3. The guide plates are located on both sides of the feed inlet. When feeding, it can prevent the waste from falling outside the box body. A hollow shaft 5 is coaxially arranged inside the dissolution tank 2. Both ends of the hollow shaft 5 sequentially extend out of the dissolution tank 2 and the box body 1 and are fixed to the box body 1 and the dissolution tank 2 through bearings. A plurality of nozzles 6 are arranged at the bottom of the hollow shaft 5. In order to increase the area of the solvent sprayed from the nozzles, the entire cavity of the spray hole 41 of the nozzle is in the shape of a triangular prism, and the side edges are arranged downward and along the axial direction of the hollow shaft, so that all the solvents sprayed from the spray holes form a water curtain, which not only increases the impact area on the iridium-containing waste but also saves the treatment time.

[0033] Furthermore, a drain pipe 7 is arranged at the bottom of the dissolution tank 2. Both ends of the hollow shaft 5 are respectively connected with a return pipe 8 and a feed pipe 9. The feed pipe 9 is connected to a reagent tank, and a pump is used to transport the solvent to the feed pipe. The return pipe 8 is connected to the drain pipe 7. A first pump 10 is arranged on the return pipe 8. The drain pipe 7 is connected to a digestion tank 11, and the digestion tank 11 is connected to a precipitation tank 12. It should be noted that at the connection of the return pipe and the drain pipe, the return pipe is arranged obliquely downward, so that when the feed pipe is opened, the mixed solution can more easily flow into the return pipe. There are two circulation methods for the mixed solution in the digestion tank. One is: as Figure 1In the manner shown, when the mixed liquid in the dissolution tank is excessive and affects the flushing effect, open the valve on the drain pipe, and combine with the first pump to pump the mixed soil into the hollow shaft and then spray it out through the nozzle. The pressure of the sprayed mixed liquid is provided by the first pump, such as a pressure pump. At the same time, when the first pump is started, the feeding pipe for transporting the original solvent needs to be stopped. Another way is to directly pump the mixed liquid discharged from the drain pipe into the reagent tank through the first pump, and then pump it into the feeding pipe and the hollow shaft by the pump and spray it out through the nozzle. Specifically, select the mixed liquid circulation method according to needs. Further, when choosing any one of these two methods, after the original mixed liquid is sprayed out, the mixed liquid in the dissolution tank can be pumped into the hollow shaft or the reagent tank for reuse.

[0034] Further, in order to stir the iridium-containing waste in the dissolution tank, a first gear 13 is sleeved on one end of the hollow shaft 5 extending out of the box body 1. A rack 14 meshing with the first gear 13 is slidably arranged outside the box body 1. Specifically, a slide rail and a slider cooperating with the slide rail are embedded on the outer wall of the box body. Multiple sliders can be provided according to the length of the rack and are fixed to the side wall of the rack. The rack 14 is driven by a first telescopic member 15, that is, the output end of the first telescopic member is fixed to one end of the rack to drive the rack to reciprocate along the slide rail. It should be noted that the first telescopic member can be an electric push rod. By driving the rack to reciprocate, the first gear is driven to rotate clockwise and counterclockwise, and then the hollow shaft rotates around its axis. The rotation range is determined by the laying surface of the iridium-containing waste in the dissolution tank, and the solvent sprayed out by the nozzle should act on the iridium-containing waste as much as possible to increase the impact range. Compared with only impacting at one position, when the hollow shaft rotates, the impact range is wider. The clockwise and counterclockwise rotation angles of the hollow shaft are both ≤ 90°. The position of the rack is set according to needs as long as it can drive the first gear to rotate forward and backward. As another implementation method, a motor can be used to drive the first gear to rotate, but frequent forward and reverse rotations cause greater loss to the motor. Specifically, select which method according to needs.

[0035] Further, a stop bar 42 can be arranged on the outer side of the rack to limit the first gear.

[0036] Further, in order to discharge the iridium-containing waste after processing out of the dissolution tank, a sleeve 16 is sleeved on the other end of the hollow shaft 5. The sleeve is coaxial with the hollow shaft. The sleeve 16 passes through the box body 1 and is fixed to the end face of the dissolution tank 2. The sleeve 16 is fixed to the box body 1 through a bearing. A second gear 17 is fixedly sleeved on the outer sleeve of the sleeve 16. The second gear 17 is driven by a first motor. The dissolution tank is rotated by the first motor so that the feed port faces downward, thereby discharging the processed waste. When rotating the dissolution tank, the liquid discharge pipe needs to be removed from the dissolution tank. A collection tank (not shown in the figure) can be arranged in the box body and below the dissolution tank so that the waste directly falls into the collection tank.

[0037] Further, in order to stir the iridium-containing waste and stir the unimpacted waste to the surface, a stirring frame is arranged at the bottom of the hollow shaft 5 in the dissolution tank 2. The stirring frame rotates with the hollow shaft. The stirring frame includes corresponding support rods 18. Multiple support rods can be arranged and are arranged along the radial direction of the hollow shaft. The support rods 18 are arranged at the bottom of the hollow shaft 5 near both ends of the dissolution tank 2. One end of the support rod facing the dissolution tank and adjacent support rods are connected by an arc-shaped strip. The center of the arc-shaped strip coincides with the axis of the hollow shaft. A connecting rod 19 is arranged between the corresponding support rods 18. A scraping strip 20 in contact with the inner wall of the dissolution tank 2 is arranged at the bottom of the connecting rod 19. The scraping strip is made of rubber to prevent the waste from getting stuck in the gap between the connecting rod and the dissolution tank. When the hollow shaft rotates forward and backward under the action of the first telescopic member, the stirring frame also rotates accordingly, playing a role in stirring the waste and stirring the unimpacted waste to the surface. It should be noted that: the connecting rod is arranged on the side wall of the end of the support rod close to the inner wall of the dissolution tank, and the scraping strip is arranged at the bottom of the connecting rod. At the same time, according to actual needs, a connecting rod can be arranged above the connecting rod and between the two support rods to enhance the stirring effect.

[0038] Further, after the waste material is soaked, it is pumped into the digestion tank through the second pump 21 provided on the drain pipe 7 for digestion. Specifically: a multi-way pipe joint 22 is provided at the outlet of the drain pipe 7, such as a four-channel pipe joint, and valves are provided on each channel. Each outlet of the multi-channel pipe joint 22 is connected to the digestion chamber on the digestion tank 11 through a pipe 23. A check valve is provided at the connection between the digestion chamber and the pipe 23 to ensure the sealed environment of the digestion chamber. An exhaust pipe 24 is provided on the digestion chamber, and a valve is provided on the exhaust pipe 24. Specifically: the exhaust pipes on the digestion chamber are interconnected, or are connected by another pipe, and then the digestion chamber is exhausted through a valve. When the mixed solution (the mixed solution containing iridium) in the digestion chamber is injected, it is exhausted through the exhaust pipe, and the valve is closed after the injection is completed. When injecting the mixed solution into the digestion chamber, a flow meter can be set to detect the injected volume as needed. A valve is provided at the outlet of the digestion chamber, and a liquid outlet pipe 25 is connected to the valve. When the digestion is completed, the valves at the outlet of the digestion chamber and on the exhaust pipe are opened, and through the third pump 26 provided on the liquid outlet pipe 25, the outlet end of the liquid outlet pipe 25 is connected to the precipitation tank 12, and the mixed solution is pumped into the precipitation tank. It should be noted that the heating element, magnetron, digestion chamber and other components provided in the digestion tank are all prior arts. For the digestion tank, the present invention only improves the inlet and outlet positions of the digestion chamber according to actual needs.

[0039] Further, a liftable filter mesh plate 27 is provided in the precipitation tank 12, a tank door 28 is provided on the side wall of the precipitation tank 12, the end of the liquid outlet pipe 25 extending into the precipitation tank 12 is bent downward, a liftable stirrer is provided in the precipitation tank 12, and a solvent pipe 29 and a water inlet pipe 30 are connected to the precipitation tank 12. It should be noted that in the precipitation tank, alkali (such as ammonia water) is added through the solvent pipe to adjust the pH of the solution after digestion, and then a precipitant (such as ammonium chloride) is added to precipitate iridium ions. The solvent pipe can be provided with multiple ones according to needs, or one can be used to add different reagents respectively. After precipitation is completed, filtration is carried out using the filter mesh plate, and after washing with deionized water multiple times and drying, the calcined product can be reduced in a hydrogen or carbon monoxide atmosphere by calcination to reduce iridium ions to metallic iridium.

[0040] Further, in order to avoid directly impacting the precipitate when deionized water is added through the water inlet pipe during the washing process of the precipitate, the end of the water inlet pipe extending into the precipitation tank fits the inner wall of the precipitation tank.

[0041] Further, the filter screen plate 27 is square, and a fixing frame 31 in the shape of "┓" is arranged on three side walls thereof. The horizontal part of the fixing frame 31 faces outward. A limiting frame 32 is arranged outside the fixing frame 31. One side of the limiting frame 32 is open. An "L"-shaped platform 33 adapted to the fixing frame 31 is arranged on the inner wall of the limiting frame 32. The platform 33 and the top surface of the limiting frame 32 are inclined surfaces that incline towards the inside of the limiting frame 32. It should be noted that: the limiting frame and the fixing frame are adapted. By placing the fixing frame on the platform and fixing it with bolts or pins. The height of the filter screen plate is less than the height of the fixing frame, so that a groove for accommodating sediment is formed between the fixing frame and the filter screen plate. Combined with the limiting frame, the sediment can be contained in the groove as much as possible. The limiting frame is adapted to the inside of the sedimentation tank, so that the gap between the limiting frame and the sedimentation tank is as small as possible.

[0042] Further, in order to enable the filter screen plate to filter the sediment, screw holes 34 are arranged on two opposite sides of the limiting frame 32. The screw holes are arranged in the middle of both sides of the limiting frame. A screw rod 35 is adapted in the screw hole 34. A second motor 36 is arranged at one end of the screw rod 35 extending out of the top of the sedimentation tank 12. The other end of the screw rod 35 is fixed to the inner bottom of the sedimentation tank 12 through a bearing. By driving the screw rod to rotate by the second motor, the limiting frame is driven to lift and lower. Furthermore, in order to ensure the smoothness of the filter screen plate during lifting and lowering, a bearing is fixedly penetrated at the position of the screw hole, and a screw sleeve adapted to the screw rod is fixed in the inner ring of the bearing. To a certain extent, when the limiting frame is inclined, it is prevented from getting stuck with the screw rod. At the same time, the screw rod and the screw sleeve can be replaced with a lead screw and a nut. In order to ensure the stability of the limiting frame during lifting and lowering, guide posts 37 are arranged on the outer wall of the limiting frame 32, and guide grooves 38 adapted to the guide posts 37 are arranged on the inner wall of the sedimentation tank 12. The number of guide posts can be set according to the length and width of the limiting frame.

[0043] Further, the stirrer includes a second telescopic member 39 vertically arranged in the sedimentation tank 12. A mixing plate 40 is horizontally arranged at the output end of the second telescopic member 39. A plurality of through holes are arranged on the mixing plate 40. It should be noted that: the second telescopic member can be an electric telescopic rod. Its rod part extends into the sedimentation tank and is provided with a mixing plate. By driving the mixing plate to move up and down by the second telescopic member and combining with the through holes, the mixing or stirring of the solution in the sedimentation tank can be realized, so as to avoid inaccurate pH value and uneven mixing of the precipitant.

[0044] Further, the sedimentation tank is equipped with a heating system and an exhaust port, and a water outlet pipe is arranged at the bottom. When the solution sedimentation is completed, the liquid is discharged through the water outlet pipe, and then the sediment is washed through the water inlet pipe. During the washing process, the lifting and lowering of the filter screen plate can be coordinated to achieve the filtering effect. After washing, the sediment is dried, and then it is lifted to a position corresponding to the tank door, the filter screen plate is taken out, and then subsequent operations are carried out.

[0045] When using the device of the present invention, the operation and adjustment of each component can be opened and closed according to actual needs, such as the opening and closing timing of motors, valves, telescopic members, pumps, etc.

[0046] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0047] The embodiments described above are only for describing the preferred mode of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solution of the present invention should fall within the protection scope determined by the claims of the present invention.

Claims

1. An apparatus for recovering iridium from iridium-containing waste, characterized in that: It includes a box body (1), a dissolution tank (2) is horizontally arranged inside the box body (1), a feed inlet (3) is arranged at the top of the dissolution tank (2), a hollow shaft (5) is coaxially arranged inside the dissolution tank (2), both ends of the hollow shaft (5) sequentially extend out of the dissolution tank (2) and the box body (1) and are fixed to the box body (1) and the dissolution tank (2) through bearings. A plurality of nozzles (6) are arranged at the bottom of the hollow shaft (5). A drain pipe (7) is arranged at the bottom of the dissolution tank (2). Both ends of the hollow shaft (5) are respectively connected with a return pipe (8) and a feed pipe (9). The feed pipe (9) is connected to a reagent tank, the return pipe (8) is connected to the drain pipe (7), a first pump (10) is arranged on the return pipe (8), the drain pipe (7) is connected to a digestion tank (11), and the digestion tank (11) is connected to a precipitation tank (12).

2. The device for recovering iridium from iridium-containing waste according to claim 1, wherein: A first gear (13) is sleeved on the end of the hollow shaft (5) extending out of the box body (1). A rack (14) meshing with the first gear (13) is slidably arranged outside the box body (1), and the rack (14) is driven by a first telescopic member (15).

3. The device for recovering iridium from iridium-containing waste according to claim 2, characterized in that: A sleeve (16) is sleeved on the other end of the hollow shaft (5). The sleeve (16) passes through the box body (1) and is fixed to the end face of the dissolution tank (2). The sleeve (16) is fixed to the box body (1) through a bearing. A second gear (17) is fixedly sleeved outside the sleeve (16), and the second gear (17) is driven by a first motor.

4. The device for recovering iridium from iridium-containing waste according to claim 2, wherein: A stirring frame is arranged at the bottom of the hollow shaft (5) inside the dissolution tank (2). The stirring frame includes corresponding support rods (18). The support rods (18) are arranged at the bottom of the hollow shaft (5) near both ends of the dissolution tank (2). A connecting rod (19) is arranged between the support rods (18), and a scraping strip (20) contacting the inner wall of the dissolution tank (2) is arranged at the bottom of the connecting rod (19).

5. The device for recovering iridium from iridium-containing waste according to claim 1, wherein: A second pump (21) is arranged on the drain pipe (7). A multi-channel pipe joint (22) is arranged at the outlet of the drain pipe (7). Each outlet of the multi-channel pipe joint (22) is connected to a digestion chamber on the digestion tank (11) through a pipeline (23). A one-way valve is arranged at the connection between the digestion chamber and the pipeline (23). An exhaust pipe (24) is arranged on the digestion chamber, a valve is arranged on the exhaust pipe (24), a valve is arranged at the outlet of the digestion chamber, the valve at the outlet of the digestion chamber is connected to a liquid outlet pipe (25), a third pump (26) is arranged on the liquid outlet pipe (25), and the outlet end of the liquid outlet pipe (25) is connected to the precipitation tank (12).

6. The device for recovering iridium from iridium-containing waste according to claim 5, characterized in that: A liftable filter screen plate (27) is arranged inside the precipitation tank (12). A tank door (28) is arranged on the side wall of the precipitation tank (12). The end of the liquid outlet pipe (25) extending into the precipitation tank (12) is bent downward. A liftable stirrer is arranged inside the precipitation tank (12). A solvent pipe (29) and a water inlet pipe (30) are connected to the precipitation tank (12); The filter screen plate (27) is square, and a fixing frame (31) in the shape of "┓" is arranged on three side walls thereof, and the horizontal part of the fixing frame (31) faces outward. A limiting frame (32) is arranged outside the fixing frame (31). One side of the limiting frame (32) is open. A platform (33) in the shape of "L" and adapted to the fixing frame (31) is arranged on the inner wall of the limiting frame (32). The platform (33) and the top surface of the limiting frame (32) are inclined planes inclined towards the inside of the limiting frame (32).

7. An apparatus for recovering iridium from iridium-containing waste according to claim 6, characterized in that: Screw holes (34) are arranged on two opposite sides of the limiting frame (32). Screws (35) are fitted in the screw holes (34). A second motor (36) is arranged at one end of the screw (35) extending out of the top of the precipitation tank (12). The other end of the screw (35) is fixed to the inner bottom of the precipitation tank (12) through a bearing. Guide posts (37) are arranged on the outer wall of the limiting frame (32), and guide grooves (38) adapted to the guide posts (37) are arranged on the inner wall of the precipitation tank (12); The stirrer includes a second telescopic member (39) vertically arranged in the precipitation tank (12). A mixing plate (40) is horizontally arranged at the output end of the second telescopic member (39). A plurality of through holes are arranged on the mixing plate (40).

8. A device for recovering iridium from iridium-containing waste according to any one of claims 1-7, characterized in that: In the device for recovering iridium, a high pressure and a mixed solution of hydrochloric acid and hydrogen peroxide are used to impact the iridium-containing waste, and the mixed solution dissolved with iridium after the impact is returned to the above part for re-impact; after multiple impacts are completed, the iridium-containing waste is soaked in the mixed solution for 1-2 h; after soaking is completed, the iridium-containing mixed solution is transported to a digestion tank for microwave digestion. After digestion is completed, iridium is precipitated by adding a precipitant, and after multiple washings, filtrations and drying, an iridium-containing precipitate is obtained.

9. The device for recovering iridium from iridium-containing waste according to claim 8, characterized in that: The concentration of the hydrochloric acid is 5-15%, and the volume ratio of the hydrochloric acid to the hydrogen peroxide is 1:

1.

10. An apparatus for recovering iridium from iridium-containing waste according to claim 8, characterized in that: The power of the microwave digestion is 1500 W, the temperature is 220 °C - 285 °C, the time is ≤1 h, and the pressure is 15-18 MPa.

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