Circuit board precious metal extraction reaction kettle

Abstract

The utility model discloses a circuit board precious metal extraction reaction kettle which comprises a reaction kettle body, a protection box is installed at the upper end of the reaction kettle body, the protection box and the reaction kettle body are rotationally sleeved with a main stirring shaft, the main stirring shaft is sleeved with an auxiliary stirring shaft, the main stirring shaft and the auxiliary stirring shaft are both connected with rotating mechanisms, and the rotating mechanisms are connected with the protection box. Three mixed acid solution spraying pipes and three thiourea catalyst spraying pipes are mounted on the peripheral side wall of the reaction kettle body at equal intervals, and three ultrasonic generators are arranged on each of the two sides of the reaction kettle body. According to the utility model, not only can the mixing sufficiency be greatly improved and the existence of an ineffective mixing area be reduced through the combination of double-shaft cooperation and ultrasonic cavitation, but also the distribution uniformity of reaction liquid can be greatly improved through the arrangement of the three layers of spraying structures, and meanwhile, the internal cavitation intensity is greatly optimized through the arrangement of the ultrasonic array, so that the production efficiency is greatly improved. The efficiency of catalytic reaction is improved, and the sufficiency and effectiveness of catalysis are ensured.

Description

Technical Field

[0001] This utility model relates to the field of precious metal extraction technology for circuit boards, and in particular to a reaction vessel for precious metal extraction from circuit boards. Background Technology

[0002] With the widespread use of electronic products, the demand for circuit boards is increasing. The precious metals such as gold contained in circuit boards are not only crucial for improving the performance of electronic products, but also bring considerable economic value. Currently, the extraction of precious metals from waste circuit boards requires catalysis through a reaction vessel. However, the traditional reaction vessel catalytic reaction is insufficient. The traditional single-shaft stirring system has an ineffective mixing zone of 30-40% in the central area and edge of the reaction vessel, which leads to a sharp drop in reaction efficiency when the particle size is >2mm, resulting in low catalyst-reactant contact efficiency. To address these issues, we have proposed a circuit board precious metal extraction reaction vessel. Utility Model Content

[0003] The purpose of this invention is to address the shortcomings of existing technologies by proposing a circuit board precious metal extraction reactor.

[0004] To achieve the above objectives, the present invention adopts the following technical solution:

[0005] A circuit board precious metal extraction reactor includes a reactor body, a protective box installed at the upper end of the reactor body, a main stirring shaft rotatably connected to the protective box and the reactor body, a secondary stirring shaft sleeved on the main stirring shaft, and a rotating mechanism connected to both the main stirring shaft and the secondary stirring shaft. Three mixed acid solution spray pipes and three thiourea catalyst spray pipes are installed at equal intervals on the circumference side wall of the reactor body. Three ultrasonic generators are provided on both sides of the reactor body, with the three ultrasonic generators on the same side forming a group, and the two groups of ultrasonic generators are staggered.

[0006] Preferably, one end of the mixed acid solution spray pipe is connected to a mixed acid solution delivery pipe, and one end of the thiourea catalyst spray pipe is connected to a thiourea catalyst delivery pipe. The mixed acid solution spray pipe and the thiourea catalyst spray pipe on the same side are interconnected. Multiple nozzles are connected at equal intervals on the circumferential sidewalls of the mixed acid solution spray pipe and the thiourea catalyst spray pipe.

[0007] Preferably, the rotating mechanism includes mounting brackets fixed on both sides inside the protective box, a drive motor is mounted on the mounting brackets, the output shaft of the drive motor is connected to a first gear through a coupling, and a second gear is fixedly fitted on the upper ends of both the main stirring shaft and the auxiliary stirring shaft, with one first gear on the same side meshing with one end of a second gear on the same side.

[0008] Preferably, turbine blades and inclined blades are installed at equal intervals at the lower end of the main stirring shaft.

[0009] Preferably, the lower end of the auxiliary stirring shaft is connected to an anchor-type wall scraper.

[0010] Preferably, a feeding port is connected to one side of the upper end of the reaction vessel body, and a cap is hinged to one side of the upper end of the feeding port.

[0011] Preferably, the lower end of the reactor body is connected to a discharge pipe, and the discharge pipe is equipped with a valve.

[0012] In this invention, after the material is initially crushed to 3mm, it enters the reactor body through the inlet. A mixed acid solution (HNO3:HCl = 1:3, flow rate 2L / min) and a thiourea catalyst (concentration 0.5mol / L) are injected. The mixed acid solution (HNO3:HCl = 1:3) is preheated to 60°C and then enters the side wall spray system at a flow rate of 8L / min. The thiourea catalyst (initial concentration 1.5mol / L) is injected in layers through independent pipelines and mixed with the mixed acid at the nozzle. The main stirring shaft rotates clockwise at 120rpm and the auxiliary stirring shaft rotates counterclockwise at 140rpm, forming turbulence with a Reynolds number > 5000. The side wall ultrasonic array is activated alternately by region (Group A works → Group B works → All stops). A 30-second ultrasonic pulse is activated every 15 minutes with a pulse power of 800W. After 4 hours of reaction, the gold ion concentration in the leachate reaches 325ppm.

[0013] In this invention, the upper 45° inclined blade (300mm in diameter) rotates at 200-600 rpm to achieve axial mixing, the middle turbine blade (200mm in diameter) rotates at 800-1200 rpm to enhance radial shear force, and the bottom anchor-type scraper blade (with a gap ≤1mm) rotates at 30-50 rpm to eliminate deposits on the reactor wall.

[0014] This utility model has the following advantages:

[0015] 1. By combining the effects of dual-axis synergy with ultrasonic cavitation, the area of ​​the mixing dead zone is reduced to ≤2%, which greatly improves the sufficiency of mixing and reduces the existence of ineffective mixing zones.

[0016] 2. By setting up a three-layer spray structure, the uniformity of reaction liquid distribution can be increased to 92%, which greatly improves the efficiency of spraying and the fullness of contact.

[0017] 3. By setting up the sidewall ultrasound array, a 1m 3 The difference in cavitation field intensity within the reactor is less than 15%, resulting in significantly optimized cavitation intensity.

[0018] In summary, this invention not only significantly improves the sufficiency of mixing and reduces the existence of ineffective mixing zones through the combined effect of biaxial synergy and ultrasonic cavitation, but also greatly improves the uniformity of reaction liquid distribution through the three-layer spray structure. At the same time, the ultrasonic array greatly optimizes the internal cavitation intensity, improves the efficiency of the catalytic reaction, and ensures the sufficiency and effectiveness of catalysis. Attached Figure Description

[0019] Figure 1 This is a structural diagram showing the connection between the main stirring shaft and the auxiliary stirring shaft of this utility model;

[0020] Figure 2 This is a diagram showing the external structure of the present invention.

[0021] Figure 3 This is a structural diagram of the main stirring shaft of this utility model;

[0022] Figure 4 This is a structural diagram of the auxiliary stirring shaft of this utility model;

[0023] Figure 5 This is a structural diagram of the rotating mechanism of this utility model;

[0024] Figure 6 This is a structural diagram of the ultrasonic generator of this utility model.

[0025] In the diagram: 1. Cover, 2. Inlet, 3. Protective box, 4. Reactor body, 5. Mixed acid solution spray pipe, 6. Thiourea catalyst delivery pipe, 7. Ultrasonic generator, 8. Discharge pipe, 9. Mixed acid solution delivery pipe, 10. Thiourea catalyst spray pipe, 11. Secondary stirring shaft, 12. Anchor-type scraper, 13. Main stirring shaft, 14. Inclined blade, 15. Turbine blade, 16. First gear, 17. Mounting bracket, 18. Drive motor, 19. Second gear. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0027] Reference Figure 1-6The circuit board precious metal extraction reactor includes a reactor body 4, a protective box 3 installed at the upper end of the reactor body 4, a main stirring shaft 13 rotatably connected to the protective box 3 and the reactor body 4, a secondary stirring shaft 11 sleeved on the main stirring shaft 13, and a rotating mechanism connected to both the main stirring shaft 13 and the secondary stirring shaft 11. The main stirring shaft 13 rotatably connected to the protective box 3 and the reactor body 4, and the secondary stirring shaft 11 sleeved on the main stirring shaft 13, and both are connected to a rotating mechanism, which allows the main stirring shaft 13 and the secondary stirring shaft 11 to rotate independently and stably, providing power for stirring the materials in the reactor.

[0028] Three mixed acid solution spray pipes 5 and three thiourea catalyst spray pipes 10 are installed at equal intervals on the side wall of the reactor body 4. Three ultrasonic generators 7 are provided on both sides of the reactor body 4. The three ultrasonic generators 7 on the same side form a group, and the two groups of ultrasonic generators 7 are staggered. The ultrasonic generators 7 can generate ultrasonic waves. The cavitation effect of ultrasonic waves can accelerate the reaction, make the mixing between materials and reagents more complete, and further improve the reaction efficiency. Its cavitation effect can generate a local high temperature and high pressure environment, accelerate the rate of chemical reaction. The alternating activation method of the regions can ensure that different regions in the reactor are affected by ultrasonic waves, ensuring the uniformity of the reaction and avoiding the occurrence of reaction dead zones.

[0029] One end of the mixed acid solution spray pipe 5 is connected to the mixed acid solution conveying pipe 9, and one end of the thiourea catalyst spray pipe 10 is connected to the thiourea catalyst conveying pipe 6. The mixed acid solution spray pipe 5 and the thiourea catalyst spray pipe 10 on the same side are interconnected. Multiple nozzles are connected at equal intervals on the circumferential sidewalls of the mixed acid solution spray pipe 5 and the thiourea catalyst spray pipe 10. The mixed acid solution spray pipe 5 and the thiourea catalyst spray pipe 10 on the same side are interconnected, and multiple nozzles are connected at equal intervals on the circumferential sidewalls of the mixed acid solution spray pipe 5 and the thiourea catalyst spray pipe 10. This allows the mixed acid solution and thiourea catalyst to be sprayed evenly into the reactor body 4, increasing the contact area between the material and the reaction reagent and improving the reaction efficiency.

[0030] The rotating mechanism includes mounting brackets 17 fixed on both sides inside the protective box 3. A drive motor 18 is mounted on the mounting brackets 17. The output shaft of the drive motor 18 is connected to a first gear 16 via a coupling. The upper ends of the main stirring shaft 13 and the auxiliary stirring shaft 11 are both fixedly fitted with second gears 19. One first gear 16 on the same side meshes with one end of a second gear 19 on the same side. The power of the drive motor 18 can be transmitted to the main stirring shaft 13 and the auxiliary stirring shaft 11 to realize their rotation. Different drive motors 18 can control the speed and direction of the main stirring shaft 13 and the auxiliary stirring shaft 11 respectively to meet different reaction requirements.

[0031] Turbine blades 15 and inclined blades 14 are installed at equal intervals at the lower end of the main stirring shaft 13. The turbine blades 15 have strong radial mixing ability, which can make the materials in the reactor fully mixed in the horizontal direction. The inclined blades 14 can generate axial flow, which can also make the materials well mixed in the vertical direction. The two are used together to make the materials in the reactor more uniformly mixed and improve the reaction effect.

[0032] The lower end of the auxiliary stirring shaft 11 is connected to an anchor-type wall scraper 12. The anchor-type wall scraper 12 can rotate close to the inner wall of the reactor body 4 to scrape off the material adhering to the inner wall, avoid the accumulation of material on the wall surface, ensure the full reaction, and also facilitate the cleaning and maintenance of the reactor.

[0033] The upper end of the reactor body 4 is connected to a feeding port 2, and a cover 1 is hinged to the upper end of the feeding port 2. The lower end of the reactor body 4 is connected to a discharge pipe 8, which is equipped with a valve. The cover 1 can be closed after the material is fed to prevent gas leakage during the reaction process and also prevent external impurities from entering the reactor and affecting the reaction results. After the reaction is completed, the valve is opened and the leachate can be discharged from the reactor through the discharge pipe 8 for convenient subsequent processing and analysis.

[0034] In this invention, after the material is initially crushed to 3mm, it enters the reactor body 4 through the inlet 2. A mixed acid solution (HNO3:HCl = 1:3, flow rate 2L / min) and a thiourea catalyst (concentration 0.5mol / L) are injected. The mixed acid solution (HNO3:HCl = 1:3) is preheated to 60°C and then enters the side wall spray system at a flow rate of 8L / min. The thiourea catalyst (initial concentration 1.5mol / L) is injected in layers through independent pipelines and mixed with the mixed acid at the nozzle. The main stirring shaft 13 rotates clockwise at 120rpm and the auxiliary stirring shaft 11 rotates counterclockwise at 140rpm, forming turbulence with a Reynolds number > 5000. The side wall ultrasonic array is activated alternately by region (Group A works → Group B works → All stops). A 30-second ultrasonic pulse is activated every 15 minutes with a pulse power of 800W. After 4 hours of reaction, the gold ion concentration in the leachate reaches 325ppm.

[0035] In this invention, the upper 45° inclined blade 14 (diameter Φ300mm) rotates at 200-600 rpm to achieve axial mixing, the middle turbine blade 15 (Φ200mm) rotates at 800-1200 rpm to enhance radial shear force, and the bottom anchor-type scraper blade 12 (gap ≤1mm) rotates at 30-50 rpm to eliminate deposits on the reactor wall.

[0036] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A circuit board precious metal extraction reactor, comprising a reactor body (4), characterized in that, A protective box (3) is installed on the upper end of the reactor body (4). A main stirring shaft (13) is rotatably connected to the protective box (3) and the reactor body (4). A secondary stirring shaft (11) is fitted on the main stirring shaft (13). A rotating mechanism is connected to both the main stirring shaft (13) and the secondary stirring shaft (11). Three mixed acid solution spray pipes (5) and three thiourea catalyst spray pipes (10) are installed at equal intervals on one side wall of the reactor body (4). Three ultrasonic generators (7) are provided on both sides of the reactor body (4). The three ultrasonic generators (7) on the same side form a group, and the two groups of ultrasonic generators (7) are staggered.

2. The circuit board precious metal extraction reactor according to claim 1, characterized in that: One end of the mixed acid solution spray pipe (5) is connected to the mixed acid solution delivery pipe (9), and one end of the thiourea catalyst spray pipe (10) is connected to the thiourea catalyst delivery pipe (6). The mixed acid solution spray pipe (5) and the thiourea catalyst spray pipe (10) on the same side are interconnected. Multiple nozzles are connected at equal intervals on the circumferential sidewalls of the mixed acid solution spray pipe (5) and the thiourea catalyst spray pipe (10).

3. The circuit board precious metal extraction reactor according to claim 1, characterized in that: The rotating mechanism includes mounting brackets (17) fixed on both sides inside the protective box (3). A drive motor (18) is mounted on the mounting brackets (17). The output shaft of the drive motor (18) is connected to a first gear (16) via a coupling. The upper ends of the main stirring shaft (13) and the auxiliary stirring shaft (11) are both fixedly fitted with second gears (19). One first gear (16) on the same side meshes with one end of one second gear (19) on the same side.

4. The circuit board precious metal extraction reactor according to claim 1, characterized in that: The lower end of the main stirring shaft (13) is equipped with turbine blades (15) and inclined blades (14) at equal intervals.

5. The circuit board precious metal extraction reactor according to claim 1, characterized in that: The lower end of the auxiliary stirring shaft (11) is connected to an anchor-type scraper (12).

6. The circuit board precious metal extraction reactor according to claim 1, characterized in that: The upper end of the reactor body (4) is connected to a feeding port (2), and a cap (1) is hinged to the upper end of the feeding port (2).

7. The circuit board precious metal extraction reactor according to claim 1, characterized in that: The lower end of the reactor body (4) is connected to a discharge pipe (8), and a valve is provided on the discharge pipe (8).

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