Waste circuit board acid leaching device and method based on precious metal recovery

Abstract

The invention discloses a waste circuit board acid leaching device and method based on precious metal recycling, and particularly relates to the technical field of precious metal recycling. The waste circuit board acid leaching device comprises a supporting frame, a smashing mechanism is fixedly installed in the middle of the supporting frame, an acid leaching mechanism is arranged at the bottom end of the smashing mechanism, and a liquid guiding mechanism is arranged at the top of the acid leaching mechanism; a feeding frame is arranged at the top end of the crushing mechanism; the acid leaching mechanism comprises a mechanism outer barrel, the mechanism outer barrel is fixedly mounted at the bottom of the supporting frame, a feeding frame is fixedly mounted at the top end of the mechanism outer barrel, an acid leaching inner barrel is movably clamped in the mechanism outer barrel, and a plurality of hollow grooves which are uniformly distributed are formed in the acid leaching inner barrel. And the crushing mechanism is used in cooperation, the waste circuit board is automatically crushed, and the crushed waste circuit board is subjected to dynamic acid leaching chemical treatment, so that the gold precipitation operation of the waste circuit board is accelerated, and the gold precipitation efficiency of the waste circuit board is further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of precious metal recovery, and specifically to an acid leaching device and method for waste circuit boards based on precious metal recovery. Background Technique

[0002] During the precious metal recovery process, acid leaching of waste circuit boards is a common method for extracting precious metals (such as gold, silver, palladium, etc.). When carrying out the acid leaching process of waste circuit boards, first disassemble the waste circuit boards and remove unnecessary parts, such as plastics and components. Subsequently, crush the disassembled circuit boards into small particles to increase the surface area, then carry out acid leaching, followed by filtration and separation after acid leaching, and finally carry out purification treatment;

[0003] In the acid leaching of waste circuit boards in traditional precious metal recovery processes, mostly manually place the waste circuit boards in an acid leaching cylinder filled with acid solution for static acid leaching. Since the waste circuit boards are static in the acid leaching cylinder, the metal precipitation efficiency is relatively slow. And after the metal is precipitated, it is necessary to manually filter the undissolved solid substances and metal precipitates. This process is prone to metal loss and the operation is rather troublesome, thus affecting the overall precious metal recovery efficiency. For this reason, we propose an acid leaching device and method for waste circuit boards based on precious metal recovery to solve the above problems. Summary of the Invention

[0004] The purpose of the present invention is to provide an acid leaching device and method for waste circuit boards based on precious metal recovery to solve the problems raised in the above background technique.

[0005] To achieve the above purpose, the present invention provides the following technical solution: An acid leaching device for waste circuit boards based on precious metal recovery, including a support frame, a crushing mechanism is fixedly installed in the middle of the support frame, an acid leaching mechanism is provided at the bottom of the crushing mechanism, a liquid guiding mechanism is provided at the top of the acid leaching mechanism, and a feeding frame is provided at the top of the crushing mechanism;

[0006] The acid leaching mechanism includes an outer cylinder of the mechanism, the outer cylinder of the mechanism is fixedly installed at the bottom of the support frame, a feeding frame is fixedly installed at the top of the outer cylinder of the mechanism, an acid leaching inner cylinder is movably clamped in the outer cylinder of the mechanism, a plurality of uniformly distributed hollow grooves are opened on the acid leaching inner cylinder, a material guiding port is provided at the top of the acid leaching inner cylinder, the top of the acid leaching inner cylinder can contact the inner wall of the outer cylinder of the mechanism, a turning horizontal axis is fixedly installed in the middle of the side end of the acid leaching inner cylinder, the turning horizontal axis is rotatably installed in the middle of the outer cylinder of the mechanism, a discharge port is opened at the bottom of the outer cylinder of the mechanism, a control sieve member is slidably provided at the bottom of the outer cylinder of the mechanism, a material distributing member is slidably clamped at the bottom of the outer cylinder of the mechanism, and a liquid discharge pipe is vertically installed at the bottom of the outer cylinder of the mechanism.

[0007] As a preferred technical solution of the present invention, the screening control member includes a bottom sealing plate, the bottom sealing plate is slidably clamped at the bottom of the outer cylinder of the mechanism, one side of the bottom sealing plate is fixedly installed with a screening plate, a plurality of evenly distributed screening through grooves are formed on the screening plate, a discharge plate is fixedly installed on the side of the screening plate away from the bottom sealing plate, a discharge port is formed in the middle of the discharge plate, the bottom sealing plate, the screening plate and the discharge plate are all arranged in an arc structure, the upper surfaces of the bottom sealing plate, the screening plate and the discharge plate are all flush with the inner wall of the outer cylinder of the mechanism, and a first rack is fixedly installed at the side ends of the bottom sealing plate, the screening plate and the discharge plate, the first rack is slidably clamped at the bottom of the outer cylinder of the mechanism, and the side ends of the first rack are all meshed with a first gear, a driving shaft is fixedly installed in the middle of the first gear, the driving shaft is rotatably installed at the bottom of the outer cylinder of the mechanism, and the bottom of the driving shaft extends out of the bottom end of the outer cylinder of the mechanism.

[0008] As a preferred technical solution of the present invention, the material distribution member includes a material distribution bottom frame, a clamping slide bar is integrally formed at the top of the material distribution bottom frame, the clamping slide bar is slidably clamped at the bottom end of the outer cylinder of the mechanism, the upper surface of the material distribution bottom frame is in contact with the lower surface of the outer cylinder of the mechanism, a first material distribution groove is formed on the side of the material distribution bottom frame close to the screening plate, a second material distribution groove is formed on the side of the material distribution bottom frame close to the discharge plate, a second rack is fixedly clamped at the side end of the material distribution bottom frame, and the side ends of the second rack are all meshed with a second gear, and the second gear is fixedly installed at the bottom of the driving shaft.

[0009] As a preferred technical solution of the present invention, a crown gear is fixedly installed in the middle of the driving shaft, a second motor is fixedly installed on the side of the bottom end of the outer cylinder of the mechanism close to the crown gear, a driving gear is fixedly installed at the driving end of the second motor, and the driving gear is meshed with the crown gear.

[0010] As a preferred technical solution of the present invention, the end of the flipping horizontal shaft away from the acid leaching inner cylinder extends out of the outside of the outer cylinder of the mechanism and is fixedly installed with a worm gear, the outside of the worm gear is meshed with a worm, the worm is rotatably installed on the outer wall of the outer cylinder of the mechanism, and a first motor is fixedly installed on the side of the outer wall of the outer cylinder of the mechanism close to the worm, and the driving end of the first motor is fixedly installed with the shaft end of the worm.

[0011] As a preferred technical solution of the present invention, two symmetrically distributed guide plates are fixedly installed on the inner side of the feeding frame, and the top end of the acid leaching inner cylinder is in contact with the bottom end of the guide plate.

[0012] As a preferred technical solution of the present invention, the liquid guiding mechanism includes two symmetrically distributed liquid guiding outer frames. An installation groove corresponding to the liquid guiding outer frame is opened at the top of the outer cylinder of the mechanism. The liquid guiding outer frame is fixedly clamped on the installation groove. A plurality of liquid guiding branch pipes are fixedly installed on the outer side of the liquid guiding outer frame. A plurality of evenly distributed liquid discharging frames are fixedly installed at the inner end of the liquid guiding outer frame. A plurality of evenly distributed liquid discharging grooves are opened on the outer side of the liquid discharging frame. The tops of the plurality of liquid guiding branch pipes are fixedly installed with a liquid guiding main pipe. A connecting head is fixedly installed on the liquid guiding main pipe.

[0013] As a preferred technical solution of the present invention, a circulation pipe is fixedly installed at the outer end of the liquid discharging pipe. A filtering member is arranged on the side of the liquid discharging pipe away from the circulation pipe. One end of the circulation pipe away from the liquid discharging pipe is fixedly installed with a three-way pipe. The three-way pipe is fixedly installed at the end of the connecting head. A first valve and a circulation pump are fixedly installed on the circulation pipe. A second valve is fixedly installed at the end of the three-way pipe. One end of the second valve away from the three-way pipe is fixedly installed with a liquid inlet pipe.

[0014] As a preferred technical solution of the present invention, the crushing mechanism includes a crushing outer frame. The crushing outer frame is fixedly installed in the middle of the support frame. The bottom end of the feeding frame is fixedly installed at the top of the crushing outer frame. The bottom end of the crushing outer frame is fixedly installed at the top of the feeding frame. Two crushing rollers are rotatably installed at the top of the crushing outer frame. A driving gear is fixedly installed at one shaft end of each crushing roller. The two driving gears are meshed and connected. A third motor is fixedly installed at the side end of the crushing outer frame. The driving end of the third motor is fixedly installed with the shaft end of one of the crushing rollers.

[0015] The using method of the waste printed circuit board acid leaching device based on precious metal recovery includes the following steps:

[0016] Step 1: In the initial state, close the first valve and the circulation pump, open the second valve. The acid solution is introduced into the liquid guiding outer frame through the liquid inlet pipe, the three-way pipe, the connecting head, the liquid guiding main pipe and a plurality of liquid guiding branch pipes. Subsequently, it is evenly discharged into the outer cylinder of the mechanism through a plurality of liquid discharging grooves on the plurality of liquid discharging frames;

[0017] In the initial state, the bottom sealing plate is located at the discharge port. The bottom sealing plate closes the discharge port to prevent subsequent waste printed circuit boards and acid solution from leaking out through the discharge port;

[0018] Step 2: Introduce the waste printed circuit board to be acid leached into the crushing outer frame through the feeding frame. Pass between the two crushing rollers. At the same time, control the opening of the third motor to drive the crushing rollers to rotate. With the meshing connection of the two driving gears, drive the two crushing rollers to rotate synchronously and reversely to automatically crush the waste printed circuit board into small particles to increase the surface area;

[0019] Step 3: Under the guiding action of the bottom end of the crushing outer frame, the top end of the feeding frame, and the two side guiding plates, the automatically crushed waste circuit boards are introduced into the acid leaching inner cylinder through the guiding port and placed at the bottom of the acid leaching inner cylinder to contact the acid solution. The waste circuit boards are acid leached in the acid solution for chemical reactions;

[0020] During acid leaching, control the first motor to drive the worm to drive the worm wheel to rotate, thereby controlling the flipping cross shaft to rotate, and further driving the acid leaching inner cylinder to flip in the mechanism outer cylinder, so that the waste circuit boards in the acid leaching inner cylinder tumble in the mechanism outer cylinder, realizing dynamic acid leaching chemical treatment of the waste circuit boards and accelerating the gold precipitation operation of the waste circuit boards;

[0021] Among them, since the top end of the acid leaching inner cylinder can contact the inner wall of the mechanism outer cylinder and the bottom sealing plate while the acid leaching inner cylinder is flipping in the mechanism outer cylinder, it can prevent the waste circuit boards in the acid leaching inner cylinder from detaching;

[0022] Step 4: When the waste circuit boards and the acid solution have fully undergone acid leaching chemical reactions, control the acid leaching inner cylinder to tumble again in the mechanism outer cylinder to make the guiding port correspond to the bottom and the discharging port;

[0023] Subsequently, control the second motor to drive the driving gear to drive the crown gear and the driving shaft to rotate, thereby synchronously controlling the first gear and the second gear to rotate. Since the first rack is meshed with the first gear and the second rack is meshed with the second gear, the first gear drives the first rack to translate and slide, and the second gear drives the second rack to translate and slide, thereby controlling the bottom sealing plate, the screening plate, the discharging plate, and the material dividing bottom frame to perform synchronous translational sliding, moving the screening plate and the first material dividing groove below the discharging port. The acid solution and the precipitated metal slowly discharge through multiple screening through grooves and flow out separately through the first material dividing groove, and the remaining undissolved solid substances are left on the upper surface of the screening plate;

[0024] While the acid solution is slowly discharging, open the first valve and the circulating pump, close the second valve. The acid solution in the mechanism outer cylinder is filtered by the filter element in the drain pipe and then introduced into the liquid guiding outer frame through the circulating pipe, the three-way pipe, the connector, the liquid guiding main pipe, and multiple liquid guiding branch pipes. Subsequently, it is evenly discharged into the mechanism outer cylinder through multiple drain grooves on multiple drain frames, makes flowing contact with the undissolved solid substances, washes the metal on the surface of the undissolved solid substances, enables the metal to completely detach from the surface of the undissolved solid substances, and discharges it;

[0025] Step 5: After the acid solution and the precipitated metal are completely discharged, control the second motor to drive the driving gear to drive the crown gear and the driving shaft to rotate again, and synchronously control the first gear and the second gear to rotate again. The first gear drives the first rack to slide horizontally again, and the second gear drives the second rack to slide horizontally again, so as to control the bottom sealing plate, the screening plate, the discharge plate and the material distribution bottom frame to slide horizontally synchronously again, move the discharge plate and the second material distribution groove below the discharge port, and slowly discharge the undissolved solids through the discharge port, and separate and flow out through the second material distribution groove alone, so as to realize the automatic separate separation and discharge of the undissolved solids, the acid solution and the metal, and prevent the loss of metal.

[0026] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0027] 1. By setting the acid leaching mechanism and cooperating with the use of the crushing mechanism, the waste circuit board is automatically crushed, and the crushed waste circuit board is dynamically acid leached and chemically treated to accelerate the gold extraction operation of the waste circuit board and further improve the gold extraction efficiency of the waste circuit board.

[0028] 2. By setting the control screening part and the material distribution part, the acid solution and the precipitated metal can be slowly discharged through multiple screening through grooves, and separated and flowed out through the first material distribution groove alone, and the undissolved solids can be slowly discharged through the discharge port and separated and flowed out through the second material distribution groove alone, so as to realize the automatic separate separation and discharge of the undissolved solids, the acid solution and the metal, and prevent the loss of metal, which is convenient for the subsequent chemical reaction extraction of the acid solution and the metal, and further improves the overall efficiency of precious metal recovery.

[0029] 3. By setting the circulation pipe, while the acid solution is slowly discharged, control the acid solution to circulate and flow into the outer cylinder of the discharge mechanism, make it flow in contact with the undissolved solid substances, wash the metal on the surface of the undissolved solid substances, make the metal completely separate from the surface of the undissolved solid substances, and discharge it. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0031] Figure 1 It is a schematic structural diagram of the present invention.

[0032] Figure 2 It is a schematic structural diagram of the present invention from another angle.

[0033] Figure 3 It is a schematic structural connection diagram of the acid leaching mechanism in the present invention.

[0034] Figure 4 It is a schematic diagram of the structural connection of another angle of the acid leaching mechanism in the present invention.

[0035] Figure 5 It is a schematic diagram of the structure of the acid leaching inner cylinder in the present invention.

[0036] Figure 6 It is a schematic diagram of the structural connection of the mechanism outer cylinder, the control sieve part and the material distribution part in the present invention.

[0037] Figure 7 For the present invention Figure 6 An enlarged view of part A.

[0038] Figure 8 For the present invention Figure 6 An enlarged view of part B.

[0039] Figure 9 It is a schematic diagram of the structural connection of the control sieve part and the material distribution part in the present invention.

[0040] Figure 10 It is a schematic diagram of the structural connection of the crushing mechanism and the feeding frame in the present invention.

[0041] Figure 11 It is a schematic diagram of the structure of the liquid guiding mechanism in the present invention.

[0042] Figure 12 It is a schematic diagram of the structure of the circulation pipe in the present invention.

[0043] In the figure: 1, support frame; 2, crushing mechanism; 3, acid leaching mechanism; 4, liquid guiding mechanism; 5, feeding frame; 31, mechanism outer cylinder; 311, installation groove; 32, feeding frame; 321, guiding plate; 322, discharge port; 33, acid leaching inner cylinder; 331, hollow groove; 332, guiding port; 34, turning horizontal axis; 341, worm gear; 342, worm; 343, first motor; 35, control sieve part; 36, material distribution part; 37, drain pipe; 38, crown gear; 381, second motor; 382, driving gear; 351, bottom sealing plate; 352, screening plate; 3521, screening through groove; 353, discharge plate; 3531, discharge port; 354, first rack; 355, first gear; 356, driving shaft; 361, material distribution bottom frame; 3611, clamping slide; 362, first material distribution groove; 363, second material distribution groove; 364, second rack; 365, second gear; 21, crushing outer frame; 22, crushing roller; 23, transmission gear; 24, third motor; 41, liquid guiding outer frame; 42, liquid guiding branch pipe; 43, drain frame; 431, drain groove; 44, liquid guiding main pipe; 441, connecting head; 6, circulation pipe; 61, three-way pipe; 62, first valve; 621, circulation pump; 63, second valve; 64, liquid inlet pipe. Detailed implementation mode

[0044] 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.

[0045] Embodiment: As Figure 1-12 shown, the present invention provides an acid leaching device for waste circuit boards based on precious metal recovery, including a support frame 1. A crushing mechanism 2 is fixedly installed in the middle of the support frame 1. An acid leaching mechanism 3 is arranged at the bottom end of the crushing mechanism 2. A liquid guiding mechanism 4 is arranged at the top of the acid leaching mechanism 3. A feeding frame 5 is arranged at the top end of the crushing mechanism 2;

[0046] The crushing mechanism 2 includes a crushing outer frame 21. The crushing outer frame 21 is fixedly installed in the middle of the support frame 1. The bottom end of the feeding frame 5 is fixedly installed at the top end of the crushing outer frame 21. Two crushing rollers 22 are rotatably installed at the top of the crushing outer frame 21. Transmission gears 23 are fixedly installed at one shaft end of each crushing roller 22. The two transmission gears 23 are meshed and connected. A third motor 24 is fixedly installed at the side end of the crushing outer frame 21. The driving end of the third motor 24 is fixedly installed with the shaft end of one of the crushing rollers 22. The waste circuit boards to be acid leached are introduced into the crushing outer frame 21 through the feeding frame 5, pass between the two crushing rollers 22. At the same time, control the third motor 24 to drive the crushing rollers 22 to rotate, and cooperate with the meshing connection of the two transmission gears 23 to drive the two crushing rollers 22 to rotate synchronously and reversely, automatically crush the waste circuit boards, and crush the waste circuit boards into small particles to increase the surface area and improve the acid leaching efficiency of the waste circuit boards.

[0047] The acid leaching mechanism 3 includes a mechanism outer cylinder 31. The mechanism outer cylinder 31 is fixedly installed at the bottom of the support frame 1. A feeding frame 32 is fixedly installed at the top end of the mechanism outer cylinder 31. The bottom end of the crushing outer frame 21 is fixedly installed at the top end of the feeding frame 32. An acid leaching inner cylinder 33 is movably clamped in the mechanism outer cylinder 31. Two symmetrically distributed guide plates 321 are fixedly installed on the inner side of the feeding frame 32. The top end of the acid leaching inner cylinder 33 contacts the bottom end of the guide plates 321; A plurality of uniformly distributed hollow grooves 331 are formed on the acid leaching inner cylinder 33. A material guiding port 332 is arranged at the top end of the acid leaching inner cylinder 33. The automatically crushed waste circuit boards are guided through the bottom end of the crushing outer frame 21, the top end of the feeding frame 32 and the two side guide plates 321, and are introduced into the acid leaching inner cylinder 33 through the material guiding port 332 and placed at the bottom of the acid leaching inner cylinder 33; A drain pipe 37 is vertically installed at the bottom of the mechanism outer cylinder 31;

[0048] The liquid guiding mechanism 4 includes two symmetrically distributed liquid guiding outer frames 41. An installation groove 311 corresponding to the liquid guiding outer frame 41 is opened at the top of the mechanism outer cylinder 31. The liquid guiding outer frame 41 is fixedly clamped in the installation groove 311. A plurality of liquid guiding branch pipes 42 are fixedly installed on the outer side of the liquid guiding outer frame 41. A plurality of evenly distributed liquid discharging frames 43 are fixedly installed at the inner end of the liquid guiding outer frame 41. A plurality of evenly distributed liquid discharging grooves 431 are opened on the outer side of the liquid discharging frame 43. The top ends of the plurality of liquid guiding branch pipes 42 are fixedly installed with a liquid guiding main pipe 44. A connecting head 441 is fixedly installed on the liquid guiding main pipe 44. The outer end of the liquid discharging pipe 37 is fixedly installed with a circulating pipe 6. A filtering member is arranged on one side of the liquid discharging pipe 37 away from the circulating pipe 6. One end of the circulating pipe 6 away from the liquid discharging pipe 37 is fixedly installed with a three-way pipe 61. The three-way pipe 61 is fixedly installed at the end of the connecting head 441. A first valve 62 and a circulating pump 621 are fixedly installed on the circulating pipe 6. A second valve 63 is fixedly installed at the end of the three-way pipe 61. One end of the second valve 63 away from the three-way pipe 61 is fixedly installed with a liquid inlet pipe 64. In the initial state, the first valve 62 and the circulating pump 621 are closed, and the second valve 63 is opened. The acid solution is introduced into the liquid guiding outer frame 41 through the liquid inlet pipe 64, the three-way pipe 61, the connecting head 441, the liquid guiding main pipe 44 and the plurality of liquid guiding branch pipes 42. Subsequently, it is evenly discharged into the mechanism outer cylinder 31 through the plurality of liquid discharging grooves 431 on the plurality of liquid discharging frames 43, and contacts with the automatically crushed waste circuit boards until the waste circuit boards are acid-leached in the acid solution for chemical reactions.

[0049] The top end of the acid-leaching inner cylinder 33 can contact the inner wall of the mechanism outer cylinder 31. A turning horizontal shaft 34 is fixedly installed in the middle of the side end of the acid-leaching inner cylinder 33. The turning horizontal shaft 34 is rotatably installed in the middle of the mechanism outer cylinder 31. One end of the turning horizontal shaft 34 away from the acid-leaching inner cylinder 33 extends out of the outer side of the mechanism outer cylinder 31 and is fixedly installed with a worm gear 341. A worm 342 is meshed and connected to the outer side of the worm gear 341. The worm 342 is rotatably installed on the outer wall of the mechanism outer cylinder 31. A first motor 343 is fixedly installed on one side of the outer wall of the mechanism outer cylinder 31 close to the worm 342. The driving end of the first motor 343 is fixedly installed with the shaft end of the worm 342. During acid-leaching, the first motor 343 is controlled to be started to drive the worm 342 to drive the worm gear 341 to rotate, so as to control the turning horizontal shaft 34 to rotate, and further drive the acid-leaching inner cylinder 33 to turn in the mechanism outer cylinder 31, so that the waste circuit boards in the acid-leaching inner cylinder 33 tumble in the mechanism outer cylinder 31, realizing dynamic acid-leaching chemical treatment of the waste circuit boards, accelerating the gold extraction operation of the waste circuit boards, further improving the gold extraction efficiency, and because the top end of the acid-leaching inner cylinder 33 can contact the inner wall of the mechanism outer cylinder 31 and the bottom sealing plate 351 while the acid-leaching inner cylinder 33 turns in the mechanism outer cylinder 31, the waste circuit boards in the acid-leaching inner cylinder 33 can be prevented from detaching;

[0050] The bottom of the outer cylinder 31 of the mechanism is provided with a discharge port 322. A sieve control member 35 is slidably arranged at the bottom of the outer cylinder 31 of the mechanism, and a material distribution member 36 is slidably clamped at the bottom end of the outer cylinder 31 of the mechanism.

[0051] The sieve control member 35 includes a bottom sealing plate 351 which is slidably clamped at the bottom of the outer cylinder 31 of the mechanism. One side of the bottom sealing plate 351 is fixedly installed with a screening plate 352. A plurality of evenly distributed screening through grooves 3521 are formed in the screening plate 352. A discharge plate 353 is fixedly installed on the side of the screening plate 352 away from the bottom sealing plate 351. A discharge port 3531 is formed in the middle of the discharge plate 353. The bottom sealing plate 351, the screening plate 352 and the discharge plate 353 are all arranged in an arc structure. The upper surfaces of the bottom sealing plate 351, the screening plate 352 and the discharge plate 353 are all flush with the inner wall of the outer cylinder 31 of the mechanism. In the initial state, the bottom sealing plate 351 is located at the discharge port 322, and the bottom sealing plate 351 closes the discharge port 322 to prevent waste circuit boards and acid solution from leaking out through the discharge port 322.

[0052] The material distribution member 36 includes a material distribution bottom frame 361. A clamping and sliding strip 3611 is integrally formed at the top of the material distribution bottom frame 361. The clamping and sliding strip 3611 is slidably clamped at the bottom end of the outer cylinder 31 of the mechanism. The upper surface of the material distribution bottom frame 361 is in contact with the lower surface of the outer cylinder 31 of the mechanism. A first material distribution groove 362 is formed in the side of the material distribution bottom frame 361 close to the screening plate 352, and a second material distribution groove 363 is formed in the side of the material distribution bottom frame 361 close to the discharge plate 353.

[0053] First racks 354 are fixedly installed at the side ends of the bottom sealing plate 351, the screening plate 352 and the discharge plate 353. The first racks 354 are slidably clamped at the bottom of the outer cylinder 31 of the mechanism. The side ends of the first racks 354 are all meshed with first gears 355. A driving shaft 356 is fixedly installed in the middle of the first gears 355. The driving shaft 356 is rotatably installed at the bottom of the outer cylinder 31 of the mechanism. The bottom of the driving shaft 356 extends out of the bottom end of the outer cylinder 31 of the mechanism.

[0054] Second racks 364 are fixedly clamped at the side ends of the material distribution bottom frame 361. The side ends of the second racks 364 are all meshed with second gears 365. The second gears 365 are fixedly installed at the bottom of the driving shaft 356.

[0055] A crown gear 38 is fixedly installed in the middle of the drive shaft 356. On one side of the bottom end of the mechanism outer cylinder 31 close to the crown gear 38, a second motor 381 is fixedly installed. The drive end of the second motor 381 is fixedly installed with a drive gear 382. The drive gear 382 is meshed and connected with the crown gear 38. After the waste circuit board and the acid solution are fully subjected to acid leaching chemical reaction, the second motor 381 is controlled to start, driving the drive gear 382 to drive the crown gear 38 and the drive shaft 356 to rotate, so as to synchronously control the first gear 355 and the second gear 365 to rotate. Since the first rack 354 is meshed and connected with the first gear 355, and the second rack 364 is meshed and connected with the second gear 365, the first gear 355 drives the first rack 354 to translate and slide, and the second gear 365 drives the second rack 364 to translate and slide, thereby controlling the bottom sealing plate 351, the screening plate 352, the discharge plate 353 and the material distribution bottom frame 361 to perform synchronous translation and sliding, so that the screening plate 352 and the first material distribution groove 362 are moved below the discharge port 322. The acid solution and the precipitated metal slowly drain through a plurality of screening through grooves 3521, and are separately separated and discharged through the first material distribution groove 362. The remaining undissolved solid substances are left on the upper surface of the screening plate 352;

[0056] While the acid solution is slowly discharged, the first valve 62 and the circulation pump 621 are opened, and the second valve 63 is closed. The acid solution in the mechanism outer cylinder 31 is filtered by the filter element in the drain pipe 37, and then introduced into the liquid guide outer frame 41 through the circulation pipe 6, the three-way pipe 61, the connector 441, the liquid guide main pipe 44 and a plurality of liquid guide branch pipes 42. Subsequently, it is uniformly discharged into the mechanism outer cylinder 31 through a plurality of drain grooves 431 on a plurality of drain frames 43, makes flowing contact with the undissolved solid substances, washes the metal on the surface of the undissolved solid substances, enables the metal to completely separate from the surface of the undissolved solid substances, and is discharged;

[0057] After the acid solution and the precipitated metal are completely discharged, the second motor 381 is controlled to start again, driving the drive gear 382 to drive the crown gear 38 and the drive shaft 356 to rotate, synchronously controlling the first gear 355 and the second gear 365 to rotate again. The first gear 355 drives the first rack 354 to translate and slide again, and the second gear 365 drives the second rack 364 to translate and slide again, thereby controlling the bottom sealing plate 351, the screening plate 352, the discharge plate 353 and the material distribution bottom frame 361 to perform synchronous translation and sliding again, so that the discharge plate 353 and the second material distribution groove 363 are moved below the discharge port 322. The undissolved solids are slowly discharged through the discharge port 3531, and are separately separated and discharged through the second material distribution groove 363, thereby realizing the automatic separate separation and discharge of the undissolved solids, the acid solution and the metal, preventing the loss of metal, facilitating the subsequent chemical reaction extraction of the acid solution and the metal, and thus improving the overall efficiency of precious metal recovery.

[0058] Usage method of an acid leaching device for waste circuit boards based on precious metal recovery, including the following steps:

[0059] Step 1: In the initial state, close the first valve 62 and the circulating pump 621, open the second valve 63, the acid solution is introduced into the liquid guide outer frame 41 through the liquid inlet pipe 64, the three-way pipe 61, the connector 441, the liquid guide main pipe 44 and multiple liquid guide branch pipes 42, and then evenly discharged into the mechanism outer cylinder 31 through multiple drain grooves 431 on multiple drain frames 43;

[0060] In the initial state, the bottom sealing plate 351 is located at the discharge port 322, and the bottom sealing plate 351 closes the discharge port 322 to prevent subsequent waste circuit boards and acid solution from leaking out through the discharge port 322;

[0061] Step 2: Feed the waste circuit board to be acid leached into the crushing outer frame 21 through the feed frame 5, pass between the two crushing rollers 22, and at the same time control the third motor 24 to drive the crushing rollers 22 to rotate. With the meshing connection of the two transmission gears 23, drive the two crushing rollers 22 to rotate synchronously in opposite directions to automatically crush the waste circuit board into small particles to increase the surface area;

[0062] Step 3: After automatic crushing, the waste circuit board is guided through the bottom of the crushing outer frame 21, the top of the feeding frame 32 and the two side guide plates 321, and is introduced into the acid leaching inner cylinder 33 through the guide port 332 and placed at the bottom of the acid leaching inner cylinder 33 to contact the acid solution. The waste circuit board is acid leached in the acid solution for a chemical reaction;

[0063] During acid leaching, control the first motor 343 to drive the worm 342 to drive the worm wheel 341 to rotate, thereby controlling the rotation of the flipping horizontal shaft 34, and further driving the acid leaching inner cylinder 33 to flip in the mechanism outer cylinder 31, so that the waste circuit board in the acid leaching inner cylinder 33 tumbles in the mechanism outer cylinder 31, realizing dynamic acid leaching chemical treatment of the waste circuit board and accelerating the gold precipitation operation of the waste circuit board;

[0064] Among them, since the top of the acid leaching inner cylinder 33 can contact the inner wall of the mechanism outer cylinder 31 and the bottom sealing plate 351 while the acid leaching inner cylinder 33 flips in the mechanism outer cylinder 31, it can prevent the waste circuit board in the acid leaching inner cylinder 33 from detaching;

[0065] Step 4: When the waste circuit board and the acid solution have fully undergone acid leaching chemical reaction, control the acid leaching inner cylinder 33 to tumble again in the mechanism outer cylinder 31 so that the guide port 332 is placed at the bottom corresponding to the discharge port 322;

[0066] Subsequently, control is used to turn on the second motor 381 to drive the drive gear 382 to drive the crown gear 38 and the drive shaft 356 to rotate, thereby synchronously controlling the rotation of the first gear 355 and the second gear 365. Since the first rack 354 is meshed and connected with the first gear 355, and the second rack 364 is meshed and connected with the second gear 365, the first gear 355 drives the first rack 354 to translate and slide, and the second gear 365 drives the second rack 364 to translate and slide, thereby controlling the synchronous translation and sliding of the bottom sealing plate 351, the screening plate 352, the discharge plate 353 and the material distribution bottom frame 361, so that the screening plate 352 and the first material distribution groove 362 are moved below the discharge port 322. The acid solution and the precipitated metal slowly drain through the multiple screening through grooves 3521, and are separately separated and discharged through the first material distribution groove 362. The remaining undissolved solid substances are left on the upper surface of the screening plate 352;

[0067] While the acid solution is slowly discharged, the first valve 62 and the circulation pump 621 are turned on, and the second valve 63 is closed. The acid solution in the mechanism outer cylinder 31 is filtered by the filter element in the drain pipe 37, and then introduced into the liquid guide outer frame 41 through the circulation pipe 6, the three-way pipe 61, the connector 441, the liquid guide main pipe 44 and the multiple liquid guide branch pipes 42. Subsequently, it is evenly discharged into the mechanism outer cylinder 31 through the multiple drain grooves 431 on the multiple drain frames 43, makes flowing contact with the undissolved solid substances, washes the metal on the surface of the undissolved solid substances, enables the metal to completely separate from the surface of the undissolved solid substances, and is discharged;

[0068] In step five, after the acid solution and the precipitated metal are completely discharged, control is used again to turn on the second motor 381 to drive the drive gear 382 to drive the crown gear 38 and the drive shaft 356 to rotate, and synchronously control the first gear 355 and the second gear 365 to rotate again. The first gear 355 drives the first rack 354 to translate and slide again, and the second gear 365 drives the second rack 364 to translate and slide again, thereby controlling the synchronous and repeated translation and sliding of the bottom sealing plate 351, the screening plate 352, the discharge plate 353 and the material distribution bottom frame 361, so that the discharge plate 353 and the second material distribution groove 363 are moved below the discharge port 322. The undissolved solids are slowly discharged through the discharge port 3531, and are separately separated and discharged through the second material distribution groove 363, thereby realizing the automatic and separate separation and discharge of the undissolved solids, the acid solution and the metal, and preventing the loss of metal.

[0069] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirits of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An acid leaching device for waste circuit boards based on precious metal recovery, comprising a support frame (1), characterized in that: A crushing mechanism (2) is fixedly installed in the middle of the support frame (1). An acid leaching mechanism (3) is provided at the bottom of the crushing mechanism (2). A liquid guiding mechanism (4) is provided at the top of the acid leaching mechanism (3). A feeding frame (5) is provided at the top of the crushing mechanism (2). The acid leaching mechanism (3) includes an outer mechanism cylinder (31). The outer mechanism cylinder (31) is fixedly installed at the bottom of the support frame (1). A feeding frame (32) is fixedly installed at the top of the outer mechanism cylinder (31). An acid leaching inner cylinder (33) is movably clamped in the outer mechanism cylinder (31). A plurality of uniformly distributed hollow slots (331) are formed in the acid leaching inner cylinder (33). A material guiding port (332) is provided at the top of the acid leaching inner cylinder (33). The top of the acid leaching inner cylinder (33) can contact the inner wall of the outer mechanism cylinder (31). A turning horizontal axis (34) is fixedly installed in the middle of the side end of the acid leaching inner cylinder (33). The turning horizontal axis (34) is rotatably installed in the middle of the outer mechanism cylinder (31). A discharge port (322) is formed at the bottom of the outer mechanism cylinder (31). A control sieve member (35) is slidably arranged at the bottom of the outer mechanism cylinder (31). A material distributing member (36) is slidably clamped at the bottom of the outer mechanism cylinder (31). A drain pipe (37) is vertically installed at the bottom of the outer mechanism cylinder (31).

2. The waste printed circuit board acid leaching device based on precious metal recovery according to claim 1, wherein: The control sieve member (35) includes a bottom sealing plate (351). The bottom sealing plate (351) is slidably clamped at the bottom of the outer mechanism cylinder (31). A screening plate (352) is fixedly installed on one side of the bottom sealing plate (351). A plurality of uniformly distributed screening through slots (3521) are formed in the screening plate (352). A discharge plate (353) is fixedly installed on the side of the screening plate (352) away from the bottom sealing plate (351). A discharge port (3531) is formed in the middle of the discharge plate (353). The bottom sealing plate (351), the screening plate (352) and the discharge plate (353) are all arranged in an arc structure. The upper surfaces of the bottom sealing plate (351), the screening plate (352) and the discharge plate (353) are all flush with the inner wall of the outer mechanism cylinder (31). First racks (354) are fixedly installed at the side ends of the bottom sealing plate (351), the screening plate (352) and the discharge plate (353). The first racks (354) are slidably clamped at the bottom of the outer mechanism cylinder (31). First gears (355) are meshed and connected to the side ends of the first racks (354). A driving shaft (356) is fixedly installed in the middle of the first gears (355). The driving shaft (356) is rotatably installed at the bottom of the outer mechanism cylinder (31). The bottom of the driving shaft (356) extends out of the bottom end of the outer mechanism cylinder (31).

3. The acid leaching device for waste circuit boards based on precious metal recovery according to claim 2, characterized in that: The material distributing member (36) includes a material distributing bottom frame (361). A clamping and sliding strip (3611) is integrally formed at the top of the material distributing bottom frame (361). The clamping and sliding strip (3611) is slidably clamped at the bottom end of the mechanism outer cylinder (31). The upper surface of the material distributing bottom frame (361) is in contact with the lower surface of the mechanism outer cylinder (31). A first material distributing groove (362) is formed on one side of the material distributing bottom frame (361) close to the screening plate (352). A second material distributing groove (363) is formed on one side of the material distributing bottom frame (361) close to the discharging plate (353). A second rack (364) is fixedly clamped at the side end of the material distributing bottom frame (361). Second gears (365) are meshed and connected to the side ends of the second rack (364). The second gears (365) are fixedly installed at the bottom of the driving shaft (356).

4. The waste printed circuit board acid leaching device based on precious metal recovery according to claim 3, characterized in that: A crown gear (38) is fixedly installed in the middle of the driving shaft (356). A second motor (381) is fixedly installed on one side of the bottom end of the mechanism outer cylinder (31) close to the crown gear (38). A driving gear (382) is fixedly installed at the driving end of the second motor (381). The driving gear (382) is meshed and connected to the crown gear (38).

5. The waste printed circuit board acid leaching device based on precious metal recovery according to claim 4, characterized in that: One end of the turning horizontal shaft (34) far from the acid dipping inner cylinder (33) extends out of the outside of the mechanism outer cylinder (31) and is fixedly installed with a worm gear (341). A worm (342) is meshed and connected to the outside of the worm gear (341). The worm (342) is rotatably installed on the outer wall of the mechanism outer cylinder (31). A first motor (343) is fixedly installed on one side of the outer wall of the mechanism outer cylinder (31) close to the worm (342). The driving end of the first motor (343) and the shaft end of the worm (342) are fixedly installed.

6. The waste printed circuit board acid leaching device based on precious metal recovery according to claim 5, wherein: Two symmetrically distributed guide plates (321) are fixedly installed inside the feeding frame (32). The top end of the acid dipping inner cylinder (33) is in contact with the bottom ends of the guide plates (321).

7. The waste printed circuit board acid leaching device based on precious metal recovery according to claim 6, characterized in that: The liquid guiding mechanism (4) includes two symmetrically distributed liquid guiding outer frames (41). Installation grooves (311) corresponding to the liquid guiding outer frames (41) are formed at the top of the mechanism outer cylinder (31). The liquid guiding outer frames (41) are fixedly clamped on the installation grooves (311). A plurality of liquid guiding branch pipes (42) are fixedly installed on the outside of the liquid guiding outer frames (41). A plurality of uniformly distributed liquid discharging frames (43) are fixedly installed at the inner ends of the liquid guiding outer frames (41). A plurality of uniformly distributed liquid discharging grooves (431) are formed on the outside of the liquid discharging frames (43). The top ends of the plurality of liquid guiding branch pipes (42) are fixedly installed with a liquid guiding main pipe (44). A connector (441) is fixedly installed on the liquid guiding main pipe (44).

8. The waste printed circuit board acid leaching device based on precious metal recovery according to claim 7, characterized in that: The outer end of the drain pipe (37) is fixedly installed with a circulation pipe (6). A filter element is arranged on the side of the drain pipe (37) away from the circulation pipe (6). One end of the circulation pipe (6) away from the drain pipe (37) is fixedly installed with a three-way pipe (61). The three-way pipe (61) is fixedly installed at the end of the connector (441). A first valve (62) and a circulation pump (621) are fixedly installed on the circulation pipe (6). A second valve (63) is fixedly installed at the end of the three-way pipe (61). One end of the second valve (63) away from the three-way pipe (61) is fixedly installed with a liquid inlet pipe (64).

9. The waste printed circuit board acid leaching device based on precious metal recovery according to claim 8, characterized in that: The crushing mechanism (2) includes a crushing outer frame (21). The crushing outer frame (21) is fixedly installed in the middle of the support frame (1). The bottom end of the feed frame (5) is fixedly installed at the top end of the crushing outer frame (21). The bottom end of the crushing outer frame (21) is fixedly installed at the top end of the feeding frame (32). Two crushing rollers (22) are rotatably installed at the top of the crushing outer frame (21). A transmission gear (23) is fixedly installed at one shaft end of each crushing roller (22). The two transmission gears (23) are meshed and connected. A third motor (24) is fixedly installed at the side end of the crushing outer frame (21). The driving end of the third motor (24) is fixedly installed with the shaft end of one of the crushing rollers (22).

10. The usage method of the waste printed circuit board acid leaching device based on precious metal recovery according to claim 9, characterized in that, It includes the following steps: Step 1: In the initial state, close the first valve (62) and the circulation pump (621), and open the second valve (63). The acid solution is introduced into the liquid guide outer frame (41) through the liquid inlet pipe (64), the three-way pipe (61), the connector (441), the liquid guide main pipe (44) and a plurality of liquid guide branch pipes (42). Subsequently, it is evenly discharged into the mechanism outer cylinder (31) through a plurality of liquid discharge grooves (431) on a plurality of liquid discharge frames (43). In the initial state, the bottom sealing plate (351) is located at the discharge port (322). The bottom sealing plate (351) closes the discharge port (322) to prevent subsequent waste circuit boards and acid solution from leaking out through the discharge port (322). Step 2: Introduce the waste circuit board to be acid-leached into the crushing outer frame (21) through the feed frame (5). Pass between the two crushing rollers (22). At the same time, control the third motor (24) to start and drive the crushing rollers (22) to rotate. With the meshing connection of the two transmission gears (23), drive the two crushing rollers (22) to rotate synchronously and in opposite directions to automatically crush the waste circuit board and crush the waste circuit board into small particles to increase the surface area. Step 3: After automatic crushing, the waste circuit board is introduced into the acid-leaching inner cylinder (33) through the bottom end of the crushing outer frame (21), the top end of the feeding frame (32) and the guiding action of the two guiding plates (321) on both sides, and is placed at the bottom of the acid-leaching inner cylinder (33) to contact the acid solution. The waste circuit board undergoes a chemical reaction when acid-leached in the acid solution. While performing acid leaching, control the first motor (343) to start driving the worm (342) to drive the worm wheel (341) to rotate, thereby controlling the rotation of the flipping cross shaft (34), and further driving the acid leaching inner cylinder (33) to flip in the mechanism outer cylinder (31), so that the waste circuit boards in the acid leaching inner cylinder (33) tumble in the mechanism outer cylinder (31), realizing dynamic acid leaching chemical treatment of the waste circuit boards and accelerating the gold extraction operation of the waste circuit boards; Among them, while the acid leaching inner cylinder (33) flips in the mechanism outer cylinder (31), the top end of the acid leaching inner cylinder (33) can contact the inner wall of the mechanism outer cylinder (31) and the bottom sealing plate (351), preventing the waste circuit boards in the acid leaching inner cylinder (33) from detaching; Step Four: After the waste circuit boards and the acid solution have undergone sufficient acid leaching chemical reaction, control the acid leaching inner cylinder (33) to tumble again in the mechanism outer cylinder (31) to align the material guiding port (332) with the bottom and the discharging port (322); Subsequently, control the second motor (381) to start driving the driving gear (382) to drive the crown gear (38) and the driving shaft (356) to rotate, thereby synchronously controlling the rotation of the first gear (355) and the second gear (365). Since the first rack (354) is meshed with the first gear (355) and the second rack (364) is meshed with the second gear (365), the first gear (355) drives the first rack (354) to translate and slide, and the second gear (365) drives the second rack (364) to translate and slide, thereby controlling the synchronous translation and sliding of the bottom sealing plate (351), the screening plate (352), the discharging plate (353), and the material distributing bottom frame (361), moving the screening plate (352) and the first material distributing groove (362) below the discharging port (322). The acid solution and the precipitated metal slowly drain through multiple screening through slots (3521) and flow out separately through the first material distributing groove (362), and the remaining undissolved solid substances are left on the upper surface of the screening plate (352); While the acid solution slowly drains, open the first valve (62) and the circulating pump (621), close the second valve (63). The acid solution in the mechanism outer cylinder (31) is filtered by the filter element in the drain pipe (37), then introduced into the liquid guiding outer frame (41) through the circulating pipe (6), the tee pipe (61), the connecting head (441), the main liquid guiding pipe (44), and multiple liquid guiding branch pipes (42). Subsequently, it is evenly discharged into the mechanism outer cylinder (31) through multiple drain slots (431) on multiple drain frames (43), making flowing contact with the undissolved solid substances, washing the metal on the surface of the undissolved solid substances, enabling the metal to completely detach from the surface of the undissolved solid substances, and discharging it; Step Five: After the acid solution and the precipitated metal are completely discharged, control the second motor (381) to start again to drive the drive gear (382) to drive the crown gear (38) and the drive shaft (356) to rotate. Synchronously control the first gear (355) and the second gear (365) to rotate again. The first gear (355) drives the first rack (354) to translate and slide again, and the second gear (365) drives the second rack (364) to translate and slide again, so as to control the bottom sealing plate (351), the screening plate (352), the discharge plate (353) and the material distribution bottom frame (361) to translate and slide synchronously again, move the discharge plate (353) and the second material distribution groove (363) below the discharge port (322), and the undissolved solids are slowly discharged through the discharge port (3531) and flow out separately through the second material distribution groove (363), so as to realize the automatic separate separation and discharge of the undissolved solids, the acid solution and the metal, and prevent the loss of metal.

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