CN108580042B - Copper-tin separation device for waste circuit boards - Google Patents
Copper-tin separation device for waste circuit boards Download PDFInfo
- Publication number
- CN108580042B CN108580042B CN201810745475.1A CN201810745475A CN108580042B CN 108580042 B CN108580042 B CN 108580042B CN 201810745475 A CN201810745475 A CN 201810745475A CN 108580042 B CN108580042 B CN 108580042B
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- separator
- tin
- copper
- crusher
- conveyor
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- 239000002699 waste material Substances 0.000 title claims abstract description 59
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 title claims abstract description 48
- 238000000926 separation method Methods 0.000 title claims abstract description 46
- 239000000428 dust Substances 0.000 claims abstract description 57
- 238000007885 magnetic separation Methods 0.000 claims abstract description 33
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims abstract description 30
- 230000007246 mechanism Effects 0.000 claims abstract description 18
- 238000010438 heat treatment Methods 0.000 claims description 30
- 238000007789 sealing Methods 0.000 claims description 28
- 239000002923 metal particle Substances 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 16
- 230000009471 action Effects 0.000 claims description 13
- 230000008569 process Effects 0.000 claims description 12
- 230000005484 gravity Effects 0.000 claims description 10
- 239000007788 liquid Substances 0.000 claims description 10
- 230000008093 supporting effect Effects 0.000 claims description 8
- 230000005540 biological transmission Effects 0.000 claims description 5
- 238000005192 partition Methods 0.000 claims description 5
- 239000011229 interlayer Substances 0.000 claims description 3
- 238000004321 preservation Methods 0.000 claims description 2
- 230000007613 environmental effect Effects 0.000 abstract description 10
- 238000004519 manufacturing process Methods 0.000 abstract description 6
- 238000013461 design Methods 0.000 abstract description 5
- 239000002341 toxic gas Substances 0.000 abstract description 5
- 239000000463 material Substances 0.000 description 48
- 239000002245 particle Substances 0.000 description 21
- 229910052751 metal Inorganic materials 0.000 description 12
- 239000002184 metal Substances 0.000 description 12
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 10
- 239000000758 substrate Substances 0.000 description 10
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 8
- 229910052802 copper Inorganic materials 0.000 description 8
- 239000010949 copper Substances 0.000 description 8
- 239000011347 resin Substances 0.000 description 6
- 229920005989 resin Polymers 0.000 description 6
- 229910052782 aluminium Inorganic materials 0.000 description 5
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 5
- 229910052742 iron Inorganic materials 0.000 description 5
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000004033 plastic Substances 0.000 description 4
- 229920003023 plastic Polymers 0.000 description 4
- 238000004064 recycling Methods 0.000 description 4
- 238000007599 discharging Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 150000002739 metals Chemical class 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 2
- 229910052737 gold Inorganic materials 0.000 description 2
- 239000010931 gold Substances 0.000 description 2
- 239000006148 magnetic separator Substances 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 229920000573 polyethylene Polymers 0.000 description 2
- 229920001155 polypropylene Polymers 0.000 description 2
- 239000004800 polyvinyl chloride Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 229910052709 silver Inorganic materials 0.000 description 2
- 239000004332 silver Substances 0.000 description 2
- 239000004793 Polystyrene Substances 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 229910001315 Tool steel Inorganic materials 0.000 description 1
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 description 1
- 239000002801 charged material Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000010793 electronic waste Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000011796 hollow space material Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000010814 metallic waste Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000010920 waste tyre Substances 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/02—Magnetic separation acting directly on the substance being separated
- B03C1/30—Combinations with other devices, not otherwise provided for
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C21/00—Disintegrating plant with or without drying of the material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/02—Magnetic separation acting directly on the substance being separated
- B03C1/23—Magnetic separation acting directly on the substance being separated with material carried by oscillating fields; with material carried by travelling fields, e.g. generated by stationary magnetic coils; Eddy-current separators, e.g. sliding ramp
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C7/00—Separating solids from solids by electrostatic effect
- B03C7/003—Pretreatment of the solids prior to electrostatic separation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/18—Drum screens
- B07B1/22—Revolving drums
Landscapes
- Engineering & Computer Science (AREA)
- Food Science & Technology (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The copper-tin separation device of the waste circuit board consists of a crushing and sorting mechanism and a copper-tin separator: a copper-tin separator is arranged at one side of the crushing and sorting mechanism; the crushing and sorting mechanism consists of an electric control cabinet, a secondary crusher, an electrostatic sorter B and an eddy current sorter; one side of the eddy current separator is sequentially provided with a three-stage crusher, an airflow separator, a pulse dust collector and an electrostatic separator B; the other side of the eddy current separator is provided with a first-stage crusher through an assembly frame; a secondary crusher is arranged on the assembly frame below the outlet of the primary crusher; the outlet of the secondary crusher is communicated with the eddy current separator through the magnetic separation conveyor. The copper-tin separation device of the waste circuit board is ingenious in design; solves the problem that a large amount of toxic gas is easy to generate when tin is recovered by the existing baking plate equipment, and reduces the environmental protection pressure; meets the production and use requirements of enterprises.
Description
Technical Field
The invention relates to a copper-tin separation device for waste circuit boards, and belongs to the technical field of waste circuit board recovery equipment.
Background
The circuit board is used as a basic component of various electric appliances and equipment, and is composed of a substrate and an electronic element; the electronic element is welded on the substrate through metal tin; the substrate is made by wrapping a copper sheet with a resin material; wherein the electronic component contains gold, silver and other metals with high added value. At present, waste circuit boards are recovered by adopting plate baking equipment to recover tin; the characteristic that the melting point of tin is lower than that of other metals is utilized, the waste circuit board is baked at high temperature, the tin is baked to be liquid and then recovered, meanwhile, as the electronic element is welded on the substrate through the tin, the electronic element is separated from the substrate after the tin is recovered to be liquid. In the process of recycling tin by adopting the method, high temperature can force a substrate made of resin material to generate a large amount of toxic gas, so that serious environmental protection problem exists; can not meet the production and use requirements of enterprises. Therefore, it is necessary to develop a copper-tin separation device for waste circuit boards to solve the above problems existing in the existing board baking equipment for recycling tin.
Disclosure of Invention
The invention aims at: the copper-tin separation device for the waste circuit board is ingenious in design and solves the problem that the existing board baking equipment is environment-friendly due to the fact that toxic gas is easy to produce when tin of the waste circuit board is recovered.
The technical scheme of the invention is as follows:
A copper-tin separation device of waste circuit boards consists of a crushing and sorting mechanism and a copper-tin separator; the method is characterized in that: a copper-tin separator is arranged at one side of the crushing and sorting mechanism; the crushing and sorting mechanism consists of an electric control cabinet, a feeding conveyor, a primary crusher, a secondary crusher, a magnetic separation conveyor, a belt conveyor, an electrostatic sorter A, an electrostatic sorter B and an eddy current sorter; one side of the eddy current separator is sequentially provided with a three-stage crusher, an airflow separator, a pulse dust collector and an electrostatic separator B; the other side of the eddy current separator is provided with a first-stage crusher through an assembly frame; a secondary crusher is arranged on the assembly frame below the outlet of the primary crusher; the inlet of the first-stage crusher is communicated with the outlet of the feeding conveyor at one side; the outlet of the secondary crusher is communicated with an eddy current separator through a magnetic separation conveyor; one outlet of the eddy current separator is connected with the three-stage crusher through a belt conveyor; the outlet of the three-stage crusher is communicated with the pulse dust collector; the pulse dust collector is communicated with the electrostatic separator B through a lifter; one side of the three-stage crusher is provided with an electrostatic separator A; the airflow separator is connected with the electrostatic separator A through the auger conveyor A; the electrostatic separator A is connected with the three-stage crusher through an auger conveyor B; each component part of the crushing and sorting mechanism is electrically connected with the electric control cabinet respectively.
The pulse dust collector is connected with a dust collection main pipe; the dust removing main pipe is connected with a plurality of dust removing branch pipes; the first-stage crusher, the magnetic separation conveyor, the eddy current separator and the belt conveyor are respectively communicated with the main dust removal pipe through dust removal branch pipes.
The magnetic separation conveyor consists of a conveying box body, a conveying belt, driving rollers, driven rollers and a separation plate; the lower end of the conveying box body which is arranged in an inclined way is provided with a driving roller; the upper end of the conveying box body is provided with a driven roller through a fixedly-mounted supporting shaft; a magnetic separation magnet is fixedly arranged on a supporting shaft in the driven roller; a partition plate is fixedly arranged in the conveying box body below the driven roller; the driving roller and the driven roller are provided with a conveyor belt; the upper end of the conveying box body is provided with a dust removing port; the lower end of the conveying box body is provided with a sorting outlet.
The magnetic separation magnet is in an arc shape, and the magnetic separation magnet is positioned at the right side of the supporting shaft.
The copper-tin separator consists of a frame, a control cabinet, a screen drum and a receiving hopper; the machine frame is provided with a screen cylinder through symmetrically arranged bearing seats; the middle part of the screen cylinder is provided with a plurality of heating pipes; two ends of the heating pipe respectively penetrate through the screen cylinder and are fixedly connected with an assembly plate fixedly arranged on the frame; two ends of the heating pipe are respectively connected with two ends of the screen cylinder in a rotating way through sealing sleeves; a receiving hopper is movably arranged on the frame below the screen cylinder; a driving motor is arranged at one side of the receiving hopper; the driving motor is connected with one end of the screen cylinder through a transmission chain; the left side assembly plate is provided with a thermocouple; one end of the thermocouple passes through the bearing seat and then extends into the screen cylinder; the thermocouple, the heating pipe and the driving motor are respectively and electrically connected with the control cabinet.
The end head of the thermocouple is spaced from the heating pipe.
The frame is fixedly provided with a feed hopper; the circumference surface of the screen cylinder below the feed hopper is provided with an adapter; the screen drum at one side of the connector is obliquely arranged.
The circumference of the screen cylinder is provided with a plurality of screens through the circulation holes, and the mesh number of the screens is 60-100 meshes.
The connector consists of an assembly cylinder, a sealing plate and a telescopic connecting sleeve; the circumference surface of the screen cylinder is fixedly provided with an assembly cylinder; the assembly cylinder is communicated with the inside of the screen cylinder; the upper end of the assembly cylinder is inserted with a sealing plate; a telescopic joint sleeve is arranged in the assembly barrel below the sealing plate through an inner flange.
One end of the sealing plate is provided with a locking support lug; the locking lugs are provided with locking openings; the assembly cylinder at the inner side of the locking support lug is fixedly provided with a locking bolt; the locking bolt locks and fixes the sealing plate on the assembly cylinder through the locking opening and the locking lug.
The telescopic connecting sleeve consists of a connecting sleeve body and a spiral spring; the connecting sleeve body is of a sandwich structure; the interlayer of the connecting sleeve is internally provided with a spiral spring.
The invention has the advantages that:
The copper-tin separation device of the waste circuit board is ingenious in design; after crushing the waste circuit boards for a plurality of times, sequentially carrying out magnetic separation and iron removal, eddy current separation and airflow separation, and separating resin particles from metal particles containing copper and tin; then heating and liquefying tin in the mixed metal particles through a copper-tin separator, and recycling the tin; the problem that a large amount of toxic gas is easily generated when tin is recovered by the existing baking plate equipment is avoided, and the environmental protection pressure is reduced; meets the production and use requirements of enterprises.
Drawings
FIG. 1 is a schematic diagram of a front view structure of the present invention;
FIG. 2 is a schematic top view of the present invention;
FIG. 3 is a schematic diagram of the magnetic separation conveyor of the present invention;
FIG. 4 is an enlarged schematic view of the structure of FIG. 3A according to the present invention;
FIG. 5 is a schematic structural diagram of a copper-tin separator according to the present invention;
FIG. 6 is an enlarged schematic view of the structure shown at B in FIG. 5;
FIG. 7 is a schematic view of the structure of the fitting cartridge and locking lugs of the present invention;
Fig. 8 is a process flow diagram of the present invention.
In the figure: 1. the feeding conveyor, 2, primary crusher, 3, secondary crusher, 4, magnetic separator, 5, belt conveyor, 6, electrostatic separator a,7, electrostatic separator B,8, eddy current separator, 9, tertiary crusher, 10, air separator, 11, pulse dust collector, 12, assembly frame, 13, elevator, 14, auger conveyor a,15, auger conveyor B,16, dust removing main pipe, 17, dust removing branch pipe, 18, conveying box, 19, conveyor belt, 20, driving roller, 21, driven roller, 22, partition plate, 23, support shaft, 24, magnetic separator magnet, 25, dust removing port, 26, sorting outlet, 27, copper-tin separator, 28, frame, 29, screen drum, 30, receiving hopper, 31, bearing seat, 32, heating pipe, 33, assembly plate, 34, sealing sleeve, 35, driving motor, 36, driving chain, 37, thermocouple, 38, feeding hopper, 39, assembly drum, 40, sealing plate, 41, telescopic joint, 42, locking lug, 43, locking bolt.
Detailed Description
The copper-tin separation device of the waste circuit board consists of a crushing and sorting mechanism and a copper-tin separator; a copper-tin separator 27 is arranged on one side of the crushing and sorting mechanism.
The crushing and sorting mechanism consists of an electric control cabinet, a feeding conveyor 1, a primary crusher 2, a secondary crusher 3, a magnetic separation conveyor 4, a belt conveyor 5, an electrostatic separator A6, an electrostatic separator B7 and an eddy current separator 8.
The three-stage crusher 9, the airflow separator 10, the pulse dust collector 11 and the electrostatic separator B7 are sequentially arranged on one side of the eddy current separator 8.
The three-stage crusher 9 is an impact crusher produced by former name of a region in eastern zhejiang Weibo environmental protection equipment technologies, inc.; when the crushing device works, the blade rotates at a high speed in the crushing chamber, and impact and shearing acting force is generated on the material to be crushed, so that the material to be crushed is crushed.
The air flow separator 10 is a product of Sichuan giant powder equipment limited company, is equipment for realizing separation according to different specific gravities of particles, is widely applied to the separation process of electronic wastes, and is actually a mixture of a fluidized bed, a shaking table and pneumatic classification equipment. The separation mechanism is that the mixed material of particles with different specific gravity is fed to one end of the bed surface and mixed with air blown from the gap of the bed surface, the particle group is loosened, fluidized and layered according to the density difference under the comprehensive actions of gravity, electromagnetic exciting force, wind force and the like, the heavy particles move to the upper end of the bed surface under the friction and vibration action of the plate, and the light particles float on the upper part of the bed surface and drift to the lower end of the bed surface, so that the separation of metal and plastic is realized.
The electrostatic separator B7 and the electrostatic separator A6 are JZ dry type electrostatic separators manufactured by former name of a region in eastern zhejiang Weibo environmental protection equipment and technology Co., ltd, and are used for separation by using different electrostatic properties of various plastics; electrostatic sorting is particularly suitable for poled polyvinyl chloride.
The materials enter the electrostatic separation inside through the feeding system and are respectively charged after passing through the charging motor. And then the material falls on the smooth surface of the grounded rotary sorting roller, the charged material is exchanged with the electrode of the grounded sorting roller, and the two materials with different electrostatic properties are different. The metal has strong conductivity, and after the metal contacts with the sorting roller, the electric charge flows out through the ground wire to be neutral, and the electric charge passes through the partition plate to enter the metal area under the action of centrifugal force. The plastic is tightly adsorbed on the surface of the sorting roller after contacting with the sorting roller due to poor conductivity, and falls into a nonmetallic area after being brushed down by a discharging brush.
The other side of the eddy current separator 8 is provided with a first-stage crusher 2 through an assembly frame 12; the primary crusher 2 is manufactured by former name of a region in eastern zhejiang Weibo environmental protection equipment technologies, inc. and adopts a four-shaft pair roller design. The device has the advantages of small noise, large torque, large crushing chamber and the like, and has larger grasping force for large lump materials, hollow materials and the like. The cutter material is made of special tool steel through special treatment. The crushing device has the effects of cracking, tearing, extruding and the like in the running process, and has strong crushing capacity; the crushing machine can crush waste wires, cables, polyvinyl chloride (PVC), polyethylene (PE), polypropylene (PP), polystyrene (PS), ABS plastics, glass, copper-clad plates and leftover materials, waste rubber (such as waste tires), waste plastic wood pipes and massive materials, and is particularly suitable for crushing waste circuit boards.
The secondary crusher 3 is arranged on the assembly frame 12 below the outlet of the primary crusher 2; the waste blocks after the waste circuit boards are crushed by the primary crusher 2 can directly enter the secondary crusher 3 for secondary crushing.
The secondary crusher 3 is an impact crusher, and in operation, blades rotate at high speed in a crushing chamber to generate impact and shearing forces on the material to be crushed, so that the material to be crushed is crushed.
The inlet of the primary crusher 2 is communicated with the outlet of the one-side feeding conveyor 1; when the feeding conveyor 1 works, the waste circuit boards can be directly conveyed into the first-stage crusher 2 for crushing.
The feeding conveyor 1 is manufactured by former name of a region in eastern zhejiang Weibo environmental protection equipment technology Co., ltd, the model is JZ-S700, a closed annular conveying belt is used as a traction and bearing member, the traction and bearing member is wound around and tensioned on front and rear rollers, and the continuous movement of the conveying belt is used for completing the conveying task. The material conveying device can convey a large amount of materials in a horizontal or slightly inclined direction, so that the task of conveying the materials among various working procedures of each mechanism is completed, the production efficiency is remarkably improved, the production cost is reduced, and the labor intensity of workers is reduced. The device has the advantages of large conveying capacity, long conveying distance, convenient operation and maintenance, stable and reliable work, no damage to materials, small friction resistance of each part, no noise, low power consumption and the like.
The outlet of the secondary crusher 3 is communicated with an eddy current separator 8 through a magnetic separation conveyor 4; the waste material blocks crushed by the secondary crusher 3 can be conveyed to an eddy current separator 8 for eddy current separation through a magnetic separation conveyor 4.
The magnetic separation conveyor 4 consists of a conveying box 18, a conveying belt 19, a driving roller 20, a driven roller 21 and a separation plate 22 (see fig. 4 and 5 in the specification); the lower end of the conveying box body 18 which is arranged in an inclined way is provided with a driving roller 20; the upper end of the conveying box body 18 is provided with a driven roller 21 through a fixedly-mounted supporting shaft 23; the driving roller 20 and the driven roller 21 are provided with a conveyor belt 19; the driving roller 20 can drive the conveyer belt 19 to rotate under the cooperation of the driven roller 21 when working; the purpose of transporting materials can be achieved during the rotation of the conveyor belt 19.
A partition plate 22 is fixedly arranged in the conveying box 18 below the driven roller 21; the upper end of the conveying box body 18 is provided with a dust removing opening 25; the lower end of the transport box 18 is provided with a sorting outlet 26.
Dust generated during the operation of the magnetic separation conveyor 4 is conveyed to the pulse dust collector 11 for treatment through the dust removing opening 25.
A support shaft 23 inside the driven roller 21 is fixedly provided with a magnetic separation magnet 24; the magnetic separation magnet 24 is curved, and the magnetic separation magnet 24 is positioned on the right side of the support shaft 23. The purpose of the magnetic separation magnet 24 is to: so that the iron-containing material can rotate to the lower part of the driven roller 21 along with the conveyor belt 19 under the magnetic force of the magnetic separation magnet 24 in the process of driving the conveyor belt 19 by the driven roller 21 to output the material, and then falls into the conveying box 18 under the action of self gravity after the magnetic force disappears in the continuous movement process, and finally is discharged through the separation outlet 26; while the iron-free material is conveyed by conveyor 19 into the eddy current classifier 8.
The eddy current separator 8 is manufactured by former name of a region in eastern zhejiang Weibo environmental protection equipment technologies Co., ltd. And has a power of 5.5KW. The vortex separator 8 has excellent separation effect on various nonferrous metals, strong adaptability and reliable mechanical structure; has the characteristics of strong (adjustable) repulsive force, high separation efficiency and the like.
The vortex separator 8 is designed by utilizing the principle that a conductor can generate induced current in a high-frequency alternating magnetic field. When the non-ferrous metal separation device works, a high-frequency alternating strong magnetic field is generated on the surface of the separation magnetic roller, when the non-ferrous metal with conductivity passes through the magnetic field, eddy current is induced in the non-ferrous metal, the eddy current generates a magnetic field with the opposite direction to the original magnetic field force, and the non-ferrous metal (such as aluminum) can fly forward along the conveying direction due to the repulsive force of the magnetic field, so that the separation from other non-metallic substances is realized. The main distinguishing criterion is the ratio value of the conductivity and the density of the materials, and the materials with high ratio value are easier to separate than the materials with low ratio value.
The waste material blocks entering the vortex separator 8 mainly comprise aluminum-containing waste material blocks and substrate blocks coated with copper sheets; because the substrate blocks wrapped with the copper sheets have the characteristic of nonmetal, when the substrate blocks are sorted by the vortex sorter 8, the vortex sorter 8 can separate the aluminum-containing waste blocks from the substrate (nonmetal-type waste blocks) wrapped with the copper sheets, so that the purpose of sorting the aluminum-containing waste blocks is achieved.
The nonmetallic outlet of the eddy current separator 8 is connected with a three-stage crusher 9 through a belt conveyor 5; the waste material blocks separated during the operation of the eddy current separator 8 are sent into the three-stage crusher 9 to be crushed through the belt conveyor.
The outlet of the three-stage crusher 9 is communicated with a pulse dust collector 11; the pulse dust collector 11 is connected with a dust collection main pipe 16; the dust removing main pipe 16 is connected with a plurality of dust removing branch pipes 17; the first-stage crusher 2, the magnetic separation conveyor 4, the eddy current separator 8 and the belt conveyor 5 are respectively communicated with the dust removal main pipe 16 through dust removal branch pipes 17.
Dust generated during the operation of the primary crusher 2, the magnetic separation conveyor 4, the eddy current separator 8 and the belt conveyor 5 enters the pulse dust collector 11 through the dust collection branch pipe 17 and the dust collection main pipe 16 for dust collection treatment.
The pulse dust collector 11 is produced by former name of a region in eastern zhejiang Weibo environmental protection equipment technology Co., ltd, and the power is 3.3KW; the pulse dust collector 11 is a dust collector for filtering with a fiber cloth. After the dust-containing gas enters the dust remover, the dust-containing gas is filtered, subjected to inertial collision, detention, diffusion and gravity sedimentation, and finally the filtered dust falls into a dust collecting hopper at the lower part under the vibration of an air pump, and the filtered gas flows away from the top of the dust remover.
The pulse dust collector 11 is communicated with the electrostatic separator B7 through a lifter 13; during operation, the material processed by the pulse dust collector 11 is conveyed to the electrostatic separator B7 through the lifter 13 for electrostatic separation.
One side of the three-stage crusher 9 is provided with an electrostatic separator A6 (see figure 3 of the specification); the airflow separator 10 is connected with the electrostatic separator A6 through an auger conveyor A14; the electrostatic classifier A6 is connected with the three-stage crusher 9 through an auger conveyor B15.
All the components of the crushing and sorting mechanism are respectively and electrically connected with the electric control cabinet. The electric control cabinet is a market purchase product, and all the components can be controlled to act under the action of the electric control cabinet.
The copper-tin separator 27 required by the copper-tin separation device of the waste circuit board consists of a rack 28, a control cabinet, a screen drum 29 and a receiving hopper 30 (see fig. 6 in the specification).
The frame 28 is provided with a screen drum 29 through symmetrically arranged bearing seats 31; the circumference of the screen drum 29 is provided with a plurality of screens through the flow holes, and the mesh number of the screens is 60-100 mesh. The screen cylinder 29 can rotate freely under the supporting action of the bearing seat 31 when being stressed.
The middle part of the screen drum 29 is provided with a plurality of heating pipes 32; the two ends of the heating pipe 32 respectively penetrate out of the screen cylinder 29 and are fixedly connected with an assembly plate 33 fixedly arranged on the frame 28.
The two ends of the heating pipe 32 are respectively connected with the two ends of the screen drum 29 in a rotating way through the sealing sleeve 34; the sealing sleeve 34 can seal the space between the heating tube 32 and the screen drum 29, thereby avoiding the problem of "leakage" of material in the screen drum 29 from between the heating tube 32 and the screen drum 29.
A receiving hopper 30 is movably arranged on the frame 28 below the screen drum 29; the section of the receiving hopper 30 is "T", and the purpose of the receiving hopper 30 is to: in order to facilitate the transportation of the receiving hopper 30 by the fork truck through the gaps at the two sides of the receiving hopper 30 during the operation.
A driving motor 35 is arranged at one side of the receiving hopper 30; the driving motor 35 is connected with one end of the screen cylinder 29 through a transmission chain 36; the driving motor 35 can drive the screen drum 29 to rotate together through the transmission chain 36 when working.
The thermocouple 37 is arranged on the left side assembly plate 33; one end of the thermocouple 37 passes through the bearing seat 31 and then extends into the screen drum 29; the material temperature detected by the thermocouple 37 can be displayed on the control cabinet; the end of the thermocouple 37 is spaced from the heating tube 32; the purpose of the thermocouple 37 is to: so that the thermocouple 37 can accurately measure the temperature of the material inside the screen drum 29 to avoid the heating tube 32 affecting the accuracy of its measurement.
The thermocouple 37, the heating tube 32 and the driving motor 35 are electrically connected with the control cabinet, respectively. The control cabinet is a PLC control cabinet, and a programmable Siemens controller is assembled in the control cabinet, and the model of the control cabinet is S7-200. Under the control action of the control cabinet, the driving motor 35 of the copper-tin separator 27 and the heating pipe 32 can act in a program under the action of the controller.
As an improvement of the copper-tin separator 27; a feed hopper 38 is fixedly arranged on the frame 28; the circumference of the screen drum 29 below the feed hopper 38 is provided with an adapter; the adapter consists of a fitting cylinder 39, a sealing plate 40 and a telescopic adapter sleeve 41 (see fig. 7 of the specification).
The circumference of the screen cylinder 29 is fixedly provided with an assembly cylinder 39; the fitting cylinder 39 communicates with the inside of the screen cylinder 29. The upper end of the assembly cylinder 39 is inserted with a sealing plate 40; the sealing plate 40 can seal the assembly cylinder 39 when inserted into the assembly cylinder 39, so that the problem that the materials in the screen cylinder 29 leak out of the assembly cylinder 39 during operation can be avoided.
One end of the sealing plate 40 is provided with a locking lug 42; the locking lugs 42 are provided with locking openings; the assembly cylinder 39 on the inner side of the locking support lug 42 is fixedly provided with a locking bolt 43; the locking bolt 43 locks the sealing plate 40 to the mounting cylinder 39 through the locking opening and the locking lugs 42 when the locking bolt 43 is tightened (see fig. 8 of the specification). When the nuts of the locking bolts 43 are loosened, the sealing plate 40 can be pulled out of the assembly drum 39, so that the assembly drum 39 is in a communicated state, and materials can enter and exit from the assembly drum 39 conveniently.
The inner diameter of the telescopic joint sleeve 41 is larger than the lower end outlet of the feed hopper 38; a telescopic adapter sleeve 41 is mounted by an inner flange in the mounting cylinder 39 below the sealing plate 40. The inner flange is fixedly connected with the bottom of the telescopic joint sleeve 41; this prevents the telescopic adapter sleeve 41 from being disengaged from the fitting cylinder 39.
The telescopic joint sleeve 41 is composed of a joint sleeve body and a spiral spring; the connecting sleeve body is made of flexible materials (such as cloth and the like) and is in a sandwich structure; the interlayer of the connecting sleeve is internally provided with a spiral spring. The purpose of this arrangement is that: so that when the sealing plate 40 is pulled out of the assembly barrel 39 to be in a communicating state, the telescopic connecting sleeve 41 can be ejected out under the action of the spiral spring, so that the telescopic connecting sleeve is in plug connection with the lower port of the feed hopper 38, and when feeding is facilitated, materials enter the inside of the screen barrel 29 through the feed hopper 38 and the telescopic connecting sleeve 41, thereby avoiding the occurrence of the problem of material leakage.
The screen drum 29 on one side of the adapter is arranged in an inclined manner; when the copper-tin separator 2 is operated and the materials in the screen cylinder 29 need to be discharged, the screen cylinder 29 needs to be manually rotated first, when the adapter corresponds to the receiving hopper 30, the sealing plate 40 is pulled out to enable the materials in the screen cylinder 29 to fall into the receiving hopper 30 through the assembling cylinder 39, and in the process, the screen cylinder 29 on one side of the adapter is obliquely arranged, so that the assembling cylinder 39 is at the lowest position, and the materials in the screen cylinder 29 fall into the assembling cylinder 39 along an inclined plane under the action of self gravity during discharging and finally are discharged through the assembling cylinder 39.
When the copper-tin separator 27 works, firstly, the screen drum 29 needs to be manually rotated to enable the connector to correspond to the feed hopper 38, then the sealing plate 40 is pulled out when the nut of the locking bolt 43 is loosened, and the telescopic connecting sleeve 41 is ejected under the action of the spiral spring and is connected with the lower port of the feed hopper 38 in a plugging manner; then by pouring the material into the feed hopper 38, the material can fall into the screen drum 29 through the telescopic connecting sleeve 41, and thus the feeding work of the screen drum 29 can be completed. During this process, the screen cylinder 29 is manually stabilized against sloshing during loading, and the problem of "leakage" of material caused by the telescopic adapter sleeve 41 being out of contact with the feed hopper 38 occurs.
After the material is fed, the telescopic connecting sleeve 41 is plugged into the assembly cylinder 39; and the sealing plate 40 is inserted and fixed again, so that the assembly tube 39 can be resealed; subsequently, the driving motor 35 is started, and the driving motor 35 drives the screen drum 29 to rotate through the transmission chain 36; at the same time, the heating pipe 32 heats the material in the screen drum 29; tin in the material flows out of the screen mesh in a liquid state after being heated and falls into a collecting hopper 30; during the fall of the liquid tin, it will cool and eventually take on a pellet form in the receiving hopper 30.
After the screen drum 29 rotates for a period of time, when no liquid tin flows out of the screen drum 29, the heating pipe 32 stops heating; the screen drum 29 continues to rotate for a period of time, and the control cabinet turns off the driving motor 35 when the internal temperature of the screen drum is displayed as normal temperature; taking out tin in the receiving hopper 30; subsequently, when the screen cylinder 29 is manually rotated to correspond the adaptor to the receiving hopper 30, the sealing plate 40 is pulled out to enable the material in the screen cylinder 29 to fall into the receiving hopper 30 through the assembling cylinder 39, and in the process, the screen cylinder 29 on one side of the adaptor is obliquely arranged, so that the assembling cylinder 39 is at the lowest position, and therefore the material in the screen cylinder 29 falls into the assembling cylinder 39 along an inclined plane under the action of self gravity during discharging and finally is discharged through the assembling cylinder 39.
The capacity of the screen drum 29 of the copper-tin separator 27 is fixed, so that the amount of the material processed by the copper-tin separator 27 is constant each time, and when a lot of materials need to be processed, a batch processing method can be adopted to finish the copper-tin separation of the materials.
The copper-tin separation device of the waste circuit board comprises the following steps:
1) Starting a crushing and sorting mechanism on an electric control cabinet, and under the control of the electric control cabinet, driving a waste circuit board by a feeding conveyor 1 to enter a first-stage crusher 2 for crushing, and conveying the waste circuit board to a second-stage crusher 3 for crushing after the first-stage crusher 2 crushes the waste circuit board into waste blocks with the size of 40-60 mm;
2) The secondary crusher 3 crushes the waste blocks entering the secondary crusher into waste blocks with the size of 8-12mm, and then sends the waste blocks into the magnetic separation conveyor 4;
3) The magnetic separation conveyor 4 sorts out the iron-containing waste blocks through a magnetic separation principle and stores the iron-containing waste blocks for further treatment; delivering the remaining scrap pieces to an eddy current classifier 8;
4) The eddy current separator 8 separates the waste blocks entering the separator by utilizing the principle that the conductor can generate induced current in the high-frequency alternating magnetic field, and the waste blocks containing aluminum are stored for further treatment after being separated; feeding other scrap pieces into the belt conveyor 5; the belt conveyor 5 sends other waste material blocks into the three-stage crusher 9;
5) The third-stage crusher 9 breaks the waste blocks entering the three-stage crusher into waste particles with the diameter smaller than 2.8mm and then conveys the waste particles to the airflow separator 10;
6) The air classifier 10 classifies the waste particles by utilizing the characteristic that the specific gravities of the particles are different; sorting out the metal waste particles with heavier density for storage for later use; delivering the mixed particles with lighter density to the pulse dust collector 11; feeding the remaining waste particles into an electrostatic classifier A6 through an auger conveyor A14;
7) The electrostatic separator A6 utilizes the electrostatic separation principle to separate the waste particles entering the electrostatic separator A6; storing and further processing the separated resin particles; storing the separated metal particles for standby; the other separated waste particles are sent into a three-stage crusher 9 through an auger conveyor B15 to participate in circulation again;
8) The pulse dust collector 11 processes the mixed particles entering the pulse dust collector, collects dust therein, and conveys the rest mixed particles to the electrostatic separator B7 through the elevator 13;
9) The electrostatic separator B7 utilizes the electrostatic separation principle to separate the mixed particles entering the electrostatic separator B7; storing and further processing the separated resin particles; storing the separated metal particles for standby;
10 Mixing the metal particles selected in the steps 5), 6) and 8), dividing the metal particles into different batches, and putting the batches into a screen drum 29 of a copper-tin separator 27 for copper-tin separation treatment;
11 The copper-tin separator 27 drives the screen drum 29 to rotate at a speed of 6-10 revolutions per minute through the driving motor 35; during rotation of the screen drum 29; the heating pipe 32 heats the metal particles; and the temperature of the metal particles is kept at 250-280 ℃ for 60-80 minutes by controlling the heating pipe 32; then the heat preservation is continued, and the driving motor 35 drives the screen drum to rotate at the rotation speed of 12-18 revolutions per minute; after being heated to be in a liquid state in the process, the tin in the metal particles flows out of the sieve holes on the sieve drum 29 and enters the collecting hopper 30 under the action of self gravity; the rotation speed of the screen drum 29 is low in the process, and the problem that the screen drum 29 throws out liquid tin through centrifugal force so that the liquid tin cannot fall into the receiving hopper 30 does not occur;
12 When no liquid tin leaks out of the screen drum 29, the heating pipe 32 is closed, and the driving motor 35 is adjusted to drive the screen drum 29 to rotate at 20-30 rpm; after the metal particles in the screen drum 29 are cooled to normal temperature, the copper-tin separator 27 is closed; taking out tin in the receiving hopper 30; taking out metal particles in the screen drum 29, wherein the metal particles are metal particles containing gold, silver, copper and other elements after tin separation; then putting the next batch of metal particles with a certain weight into a screen drum 29 of a copper-tin separator 27, and enabling the copper-tin separator 27 to enter the next working cycle; thus, the recovery of the waste circuit board and the separation of copper and tin are completed.
The copper-tin separation device of the waste circuit board is ingenious in design; after crushing the waste circuit boards for a plurality of times, sequentially carrying out magnetic separation and iron removal, eddy current separation and airflow separation, and separating resin particles from metal particles containing copper and tin; then heating and liquefying tin in the mixed metal particles through a copper-tin separator, and recycling the tin; the problem that a large amount of toxic gas is easily generated when tin is recovered by the existing baking plate equipment is avoided, and the environmental protection pressure is reduced; meets the production and use requirements of enterprises.
Claims (6)
1. A copper-tin separation device of waste circuit boards consists of a crushing and sorting mechanism and a copper-tin separator; the method is characterized in that: a copper-tin separator (27) is arranged at one side of the crushing and sorting mechanism; the crushing and sorting mechanism consists of an electric control cabinet, a feeding conveyor (1), a first-stage crusher (2), a second-stage crusher (3), a magnetic separation conveyor (4), a belt conveyor (5), an electrostatic sorting machine A (6), an electrostatic sorting machine B (7) and an eddy current sorting machine (8); one side of the eddy current separator (8) is sequentially provided with a three-stage crusher (9), an airflow separator (10), a pulse dust collector (11) and an electrostatic separator B (7); the other side of the eddy current separator (8) is provided with a first-stage crusher (2) through an assembly frame (12); a secondary crusher (3) is arranged on an assembly frame (12) below the outlet of the primary crusher (2); the inlet of the primary crusher (2) is communicated with the outlet of the feeding conveyor (1) at one side; the outlet of the secondary crusher (3) is communicated with an eddy current separator (8) through a magnetic separation conveyor (4); one outlet of the eddy current separator (8) is connected with a three-stage crusher (9) through a belt conveyor (5); the outlet of the three-stage crusher (9) is communicated with a pulse dust collector (11); the pulse dust collector (11) is communicated with the electrostatic separator B (7) through a lifting machine (13); one side of the three-stage crusher (9) is provided with an electrostatic separator A (6); the airflow separator (10) is connected with the electrostatic separator A (6) through the auger conveyor A (14); the electrostatic separator A (6) is connected with the three-stage crusher (9) through the auger conveyor B (15); each component part of the crushing and sorting mechanism is electrically connected with the electric control cabinet respectively;
the copper-tin separator (27) consists of a frame (28), a control cabinet, a screen drum (29) and a receiving hopper (30); the frame (28) is provided with a screen drum (29) through symmetrically arranged bearing seats (31); the middle part of the screen cylinder (29) is provided with a plurality of heating pipes (32); two ends of the heating pipe (32) respectively penetrate through the screen cylinder (29) and are fixedly connected with an assembly plate (33) fixedly arranged on the frame (28); two ends of the heating pipe (32) are respectively connected with two ends of the screen drum (29) in a rotating way through sealing sleeves (34); a receiving hopper (30) is movably arranged on the frame (28) below the screen drum (29); a driving motor (35) is arranged at one side of the receiving hopper (30); the driving motor (35) is connected with one end of the screen cylinder (29) through a transmission chain (36); the thermocouple (37) is arranged on the left side assembly plate (33); one end of the thermocouple (37) passes through the bearing seat (31) and then extends into the screen drum (29); the thermocouple (37), the heating pipe (32) and the driving motor (35) are respectively and electrically connected with the control cabinet;
The end head of the thermocouple (37) is spaced from the heating pipe (32) at a certain distance; a feed hopper (38) is fixedly arranged on the frame (28); the circumference of the screen cylinder (29) below the feed hopper (38) is provided with an adapter; the screen cylinder at one side of the connector is obliquely arranged;
When the copper-tin separator (27) works, the screen cylinder (29) is driven to rotate at the rotating speed of 6-10 revolutions per minute by the driving motor (35); during the rotation of the screen drum (29); the heating pipe (32) heats the metal particles; and the temperature of the metal particles is kept at 250-280 ℃ for 60-80 minutes by controlling the heating pipe (32); then, the heat preservation is continued, and the driving motor (35) drives the screen drum (29) to rotate at the rotation speed of 12-18 revolutions per minute; after being heated to be in a liquid state in the process, the tin in the metal particles flows out of the sieve holes on the sieve cylinder (29) and enters the collecting hopper (30) under the action of self gravity.
2. The copper-tin separation device of a waste circuit board according to claim 1, wherein: the pulse dust collector (11) is connected with a dust collection main pipe (16); a plurality of dust removing branch pipes (17) are connected to the dust removing main pipe (16); the first-stage crusher (2), the magnetic separation conveyor (4), the eddy current separator (8) and the belt conveyor (5) are respectively communicated with the dust removal main pipe (16) through dust removal branch pipes (17).
3. The copper-tin separation device of a waste circuit board according to claim 2, wherein: the magnetic separation conveyor (4) consists of a conveying box body (18), a conveying belt (19), driving rollers (20), driven rollers (21) and a separation plate (22); the lower end of the conveying box body (18) which is arranged in an inclined way is provided with a driving roller (20); the upper end of the conveying box body (18) is provided with a driven roller (21) through a fixedly-mounted supporting shaft (23); a magnetic separation magnet (24) is fixedly arranged on a supporting shaft (23) in the driven roller (21); a partition plate (22) is fixedly arranged in the conveying box body (18) below the driven roller (21); the driving roller (20) and the driven roller (21) are provided with a conveyor belt (19); the upper end of the conveying box body (18) is provided with a dust removing opening (25); a sorting outlet (26) is arranged at the lower end of the conveying box body (18); the magnetic separation magnet (24) is in an arc shape, and the magnetic separation magnet (24) is positioned at the right side of the supporting shaft (23).
4. The copper-tin separation device of a waste circuit board according to claim 1, wherein: the circumference of the screen cylinder (29) is provided with a plurality of screens through the circulation holes, and the mesh number of the screens is 60-100 meshes.
5. The copper-tin separation device of a waste circuit board according to claim 1, wherein: the connector consists of an assembly barrel (39), a sealing plate (40) and a telescopic connecting sleeve (41); an assembly cylinder (39) is fixedly arranged on the circumferential surface of the screen cylinder (29); the assembly cylinder (39) is communicated with the inside of the screen cylinder (29); a sealing plate (40) is inserted into the upper end of the assembly cylinder (39); a telescopic connecting sleeve (41) is arranged in an assembly cylinder (39) below the sealing plate (40) through an inner flange; one end of the sealing plate (40) is provided with a locking lug (42); the locking support lugs (42) are provided with locking openings; a locking bolt (43) is fixedly arranged on the assembly cylinder (39) at the inner side of the locking support lug (42); the sealing plate (40) is locked and fixed on the assembly cylinder (39) through the locking opening and the locking lug (42) by the locking bolt (43).
6. The copper-tin separation device for waste circuit boards according to claim 5, wherein: the telescopic connecting sleeve (41) consists of a connecting sleeve body and a spiral spring; the connecting sleeve body is of a sandwich structure; the interlayer of the connecting sleeve is internally provided with a spiral spring.
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| CN201810745475.1A CN108580042B (en) | 2018-07-09 | 2018-07-09 | Copper-tin separation device for waste circuit boards |
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| CN201810745475.1A CN108580042B (en) | 2018-07-09 | 2018-07-09 | Copper-tin separation device for waste circuit boards |
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| CN109806935B (en) * | 2019-01-30 | 2021-06-15 | 上海卫星工程研究所 | Space debris processing method based on in-situ utilization |
| JP7101635B2 (en) * | 2019-03-29 | 2022-07-15 | Ｊｘ金属株式会社 | How to dispose of scraps of electronic and electrical equipment parts |
| CN110171076B (en) * | 2019-05-27 | 2021-04-09 | 江苏绿能塑木科技有限公司 | Secondary screening device for preparing plastic-wood particle powder |
| CN110225662B (en) * | 2019-06-11 | 2022-04-01 | 宁波市镇海锂安电子有限公司 | Production process and device for lithium battery protection board |
| CN116550473B (en) * | 2023-06-26 | 2023-09-08 | 广东明方科技有限公司 | Waste circuit board fine separation recovery device based on high-voltage electrostatic separation |
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