A device for reverse resistance high voltage electrostatic classification and extraction of metal from waste circuit boards

Abstract

The present invention is in the field of reverse resistance high-voltage electrostatic classification and extraction of metals from waste circuit boards, including: a reverse resistance high-voltage electrostatic generator, a feeding mechanism, a multi-metal sorting mechanism and a non-metal recovery mechanism, wherein the non-metal recovery mechanism is connected to the zero-level sorting output end of the feeding mechanism, the discharge port of the feeding mechanism is connected to the multi-metal sorting mechanism, and the output end of the multi-metal sorting mechanism is respectively provided with non-metal and various metal recovery boxes; the output end of the reverse resistance high-voltage electrostatic generator and the arc electrode of the multi-metal sorting mechanism form a high-voltage electrostatic field. The present invention can allow the occurrence of instantaneous discharge and sparking of the high-voltage electric field to the ground without affecting the stable power supply and sorting effect of the high-voltage electrostatic generator, and realize that the high-voltage electrostatic technology can be independently applied to the field of waste circuit board sorting, and realize the classification, extraction and purification of non-metal materials and metals such as copper, tin, aluminum, and iron contained in waste circuit boards, and at the same time, non-metal materials can be directly reused as raw materials, which is energy-saving and environmentally friendly.

Description

Technical Field

[0001] The invention relates to a device for extracting metal from waste circuit boards, in particular to a device for extracting metal from waste circuit boards by reverse resistance high-voltage electrostatic classification. Background Art

[0002] With the rapid development of information technology, high-tech industries and electronic products, the demand and standards for raw materials have been greatly improved. However, with the depletion of rich mines, the quality of mineable ores has declined year by year, and the cost of mining and purification has increased. Whether from the perspective of resources, environment or economic development, environmentally friendly metal recycling is an inevitable trend.

[0003] With the rapid development of my country, electronic waste has increased at a rate of 20% and is dispersed, seriously polluting the environment. Since electronic waste contains at least 15%-35% of precious metals, especially waste circuit boards and electronic components with high content of copper, aluminum, tin and other precious metals, it has a high recycling value. About 60% of copper, 50% of tin and 30% of aluminum from electronic waste in the world have not been effectively recycled.

[0004] How to use environmentally friendly physical methods to recycle metals and make limited resources cycle infinitely is an urgent problem to be solved in the context of the increasing strengthening of resource regeneration and environmental protection concepts. In recent years, the use of traditional high-voltage static electricity to sort waste circuit board materials has emerged (refer to the patent number 200820013229.9 utility model patent applied by the applicant on May 30, 2008: waste printed circuit board high-voltage static electricity sorting machine and the patent number 201020512497 utility model patent applied on September 1, 2010: electric classification roller type waste printed board high-voltage static electricity sorting machine). More than ten years of practice have proved that this technical solution cannot be independently applied to this field. Due to the characteristics and complexity of waste circuit board materials, when the materials enter the high-voltage electric field, the output electrode will discharge and spark the grounded classification roller, causing the electrostatic generator to power off and lose the sorting function.

[0005] In order to avoid the discharge and sparking phenomenon in the high-voltage electric field, people often adopt multi-stage screening, first use wind selection, that is, multi-stage airflow specific gravity method to preliminarily select the material to obtain mixed fine material and then use electrostatic sorting. This process leads to serious metal loss. The problem is: when the material is preliminarily selected by airflow specific gravity, when the weight of metal and non-metallic particles is equal, the metal is discharged into the non-metallic tailings by the airflow, resulting in 20% metal loss, and the heavy metals contained in the non-metallic materials cannot be reused. At present, the high-voltage electrostatic technology cannot be independently applied to the technical barriers in the field of waste circuit board material sorting. There is an urgent need for a high-voltage electric field that can discharge and spark arbitrarily, and continuously and stably supply power, and is independently applicable to the high-voltage electrostatic sorting technology of waste circuit boards. Summary of the invention

[0006] In view of the technical barriers that traditional high-voltage electrostatic technology cannot be independently applied to the sorting of mixed materials of waste circuit boards, resulting in low metal recovery rate, the need for secondary purification of raw materials to increase raw material costs, and the problem that a large amount of metal cannot be extracted from non-metals, resulting in the inability to reuse non-metals, the present invention provides a method for reverse resistance high-voltage electrostatic classification and extraction of metals from waste circuit boards, so that high-voltage electrostatic technology can be independently applied to the field of waste circuit board sorting, energy-saving and environmentally friendly, and can extract metals with high quality and efficiency, so that limited resources can be infinitely recycled, and the ecological environment is effectively protected.

[0007] In order to achieve the above object, the main technical solutions adopted by the present invention include:

[0008] A device for classifying and extracting metal from waste circuit boards by reverse resistance high-voltage electrostatic classification, characterized in that it comprises: a reverse resistance high-voltage electrostatic generator, a feeding mechanism, a multi-metal sorting mechanism and a non-metal recovery mechanism, wherein the non-metal recovery mechanism is connected to the zero-level sorting output end of the feeding mechanism, the discharge port of the feeding mechanism is connected to the multi-metal sorting mechanism, and the output end of the multi-metal sorting mechanism is respectively provided with non-metal and various metal recovery boxes; the output end of the reverse resistance high-voltage electrostatic generator and the arc electrode of the multi-metal sorting mechanism form a high-voltage electrostatic field.

[0009] The reverse resistance high-voltage electrostatic generator includes an electric control system, an oil tank, an RLC circuit, a transformer and a rectifier bridge. The output end of the electric control system is connected to the primary coil of the transformer, the output end of the secondary coil of the transformer is connected to the negative input end of the rectifier bridge, and the negative output end of the rectifier bridge is connected to the RLC circuit to form a reverse resistance high-voltage electrostatic generating circuit. The output end of the reverse resistance high-voltage electrostatic generating circuit forms a high-voltage electrostatic field with the arc electrode of the multi-metal sorting mechanism.

[0010] The RLC circuit includes multiple resistors, multiple capacitors and an inductor, wherein the multiple resistors are connected in parallel to form a parallel resistor, the positive electrodes of the multiple capacitors are connected in parallel, the inductor is connected between the negative electrodes of two capacitors to form a first node and a second node, the output end of the parallel resistor is connected to the first node, and the negative electrodes of the other capacitors are connected in parallel and then connected to the high voltage output end.

[0011] The multi-metal sorting mechanism includes first to third sorting rollers and first to second permanent magnet rollers. The first sorting roller cooperates with the first arc electrode to form a high-voltage electrostatic field as the first sorting stage. The second sorting roller and the third sorting roller cooperate with the second and third arc electrodes respectively to form a high-voltage electrostatic field as the second sorting stage; the second sorting roller and the third sorting roller are respectively arranged at the two material output ends of the first sorting roller, the first permanent magnet roller is arranged at the first material output end below the second sorting roller, and the second permanent magnet roller is arranged at the second material output end below the third sorting roller; the first to second permanent magnet rollers are respectively provided with two output ends as the third sorting stage.

[0012] It also includes an electric heating tin bath, the input end of which is arranged at the second output end of the second permanent magnetic roller, and the output end of the electric heating tin bath serves as the fourth sorting stage.

[0013] The electric heating tin bath comprises a bracket and an electric heating bath, wherein the electric heating bath is rotatably connected to the bracket and an electric heating tube is arranged at the bottom of the electric heating bath, and the output end of the electric heating tin bath corresponds to a tin-aluminum recovery box.

[0014] The second sorting stage also includes the first to third partition channels, wherein the input ends of the first to second partition channels are arranged at the second to third material output ends of the second classification roller, the input end of the third partition channel is arranged at the first material output end of the third classification roller, the third material output end of the second classification roller and the first material output end of the third classification roller converge at the spiral discharger and discharge to the non-metal recycling box; the second output end of the second classification mixing drum corresponds to the intermediate recycling box.

[0015] The output end of the third sorting stage is provided with the first to third recovery boxes, which are respectively a copper recovery box corresponding to the first output end of the first permanent magnet roller, a first iron recovery box corresponding to the second output end of the first permanent magnet roller, and a second iron recovery box corresponding to the first output end of the second permanent magnet roller.

[0016] A metal scraper is arranged on the side surface of each permanent magnetic roller; and a static eliminator is also included, which is arranged at the second material sliding plate of the first classification roller.

[0017] The non-metallic recycling mechanism includes a discharge fan, a cyclone receiver, a dust collector, a hopper and a negative pressure exhaust fan, wherein the discharge fan, the cyclone receiver, the dust collector and the negative pressure exhaust fan are connected in sequence through an overflow pipe, the air inlet of the discharge fan is connected to the zeroth sorting stage output end of the feeding mechanism, and the output end of the negative pressure exhaust fan is connected to the outside air.

[0018] The present invention has the following beneficial effects and advantages:

[0019] 1. The reverse resistance high-voltage electrostatic generating circuit of the present invention can allow the high-voltage electric field to discharge and spark to the ground instantly without affecting the stable power supply and sorting effect of the high-voltage electrostatic generator, so that the high-voltage electrostatic technology can be independently applied to the field of waste circuit board sorting, which is energy-saving and environmentally friendly, and can extract metals with high quality and high efficiency;

[0020] 2. The present invention uses a method of combining reverse resistance high-voltage electrostatic technology with mechanical functions to achieve the classification, extraction and purification of non-metallic materials and metals such as copper, tin, aluminum, and iron contained in waste circuit boards. At the same time, non-metallic materials can be directly reused as raw materials;

[0021] 3. The static eliminator provided in the present invention applies voltage to the discharge electrode through a 220V high-voltage power supply to perform corona discharge, so that positive and negative ions are alternately generated, and static electricity is eliminated for aggregated materials carrying positive and negative charges, so that the materials are loosened, the discharge is smooth, and the problem of material port blockage is solved;

[0022] 4. The electric tin bath of the present invention is a container for powdered tin and aluminum metals. The tin metal powder is melted into liquid by heating, while the aluminum metal remains in its original state. The tin bath is controlled to flip 90 degrees by an automatic control system, and the tin and aluminum metals are poured into a mold box together. After the liquid tin metal is cooled, it forms a block and is automatically separated from the aluminum metal, thereby realizing the classified extraction and purification of tin and aluminum metals from waste circuit boards, and solving the problems of low recovery rate, waste of resources and environmental pollution of traditional methods for extracting tin metal. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the reverse resistance high voltage electrostatic field of the present invention;

[0024] Figure 2 The schematic diagram of the RLC circuit of the present invention;

[0025] Figure 3 A schematic diagram of the reverse resistance high voltage electrostatic field and mechanical combination method for extracting metal from waste circuit boards;

[0026] Figure 4 This is a schematic diagram of the structure of the electric tin bath of the present invention;

[0027] Figure 5 It is a schematic diagram of the structure of the static eliminator of the present invention;

[0028] Figure 6 It is a schematic diagram of the non-metal recycling system of the present invention.

[0029] Among them, F1 is a feeding fan, F2 is a cyclone distributor, F3 is a mixing box, F4 is a rolling discharger, G1 is an electronic control system, G2 is an oil tank, G3 is a transformer, G4 is a rectifier bridge, G5 is an RLC circuit, G6 is a high-voltage line, R is a resistor, C is a capacitor, L is an inductor, P1 is a first node, P2 is a second node, M7 is a first brush, M9 is a discharge electrode, M10 is a second sliding plate channel, M11 is a first sliding plate channel, M12 is a first metal scraper, M14 is a first partition channel, M15 is a second partition channel, M17 is a third partition channel, M18 is a second metal scraper, M19 is a first permanent magnet roller, M20 is a second permanent magnet roller, M21 is a fifth partition channel, M22 is a seventh partition channel, and M23 is a fourth partition channel. channel, M24 is the sixth partition channel, M25 is a spiral discharger, M26 is an electric tin bath, M261 is a bracket, M262 is an electric heating pipe, M263 is an electric heating bath, M264 is an electric control device, M27 is a tin and aluminum recovery box, M28 is the second iron recovery box, M29 is a copper recovery box, M30 is an intermediate recovery box, M31 is a non-metal recovery box, M32 is a high-voltage power supply, M34 is the first classification roller, M35 is the third classification roller, M36 is the second classification roller, M37 is a sliding plate, M38 is the first iron recovery box, M39 is the second brush, M40 is the third brush, N1 is a discharge fan, N2 is a cyclone receiver, N3 is a dust collector, N4 is a hopper, N5 is a filter, N6 is a back-blowing valve, N7 is a negative pressure exhaust fan, and N8 is an overflow pipe.

[0030] The present invention will be further described below in conjunction with the accompanying drawings. Figures 1 to 5 As shown, the present invention is a device for classifying and extracting metal from waste circuit boards by reverse resistance high-voltage electrostatic classification, characterized in that it includes: a reverse resistance high-voltage electrostatic generator, a feeding mechanism, a multi-metal sorting mechanism and a non-metal recovery mechanism, the non-metal recovery mechanism is connected to the zero-level sorting output end of the feeding mechanism (i.e., the cyclone classifier F2), the discharge port of the feeding mechanism is connected to the multi-metal sorting mechanism, and the output end of the multi-metal sorting mechanism is respectively provided with non-metal and various metal recovery boxes; the output end of the reverse resistance high-voltage electrostatic generator and the arc electrode of the multi-metal sorting mechanism form a high-voltage electrostatic field.

[0031] like Figure 1 As shown, the reverse resistance high-voltage electrostatic generator includes an electric control system G1, an oil tank G2, an RLC circuit G5, a transformer G3 and a rectifier bridge G4. The output end of the electric control system G1 is connected to the primary coil of the transformer G3, the output end of the secondary coil of the transformer G3 is connected to the negative input end of the rectifier bridge G4, and the negative output end of the rectifier bridge G4 is connected to the RLC circuit G5 to form a reverse resistance high-voltage electrostatic generating circuit. The high-voltage line G6 at the output end of the reverse resistance high-voltage electrostatic generating circuit forms a high-voltage electrostatic field with the arc electrode of the multi-metal sorting mechanism.

[0032] like Figure 2 As shown, the RLC circuit includes multiple resistors, multiple capacitors and an inductor, wherein multiple resistors R are connected in parallel to form parallel resistors, multiple capacitors C positive electrodes are connected in parallel, wherein an inductor L is connected between the negative electrodes of two capacitors C to form a first node P1 and a second node P2, the output end of the parallel resistor is connected to the first node P1, and the negative electrodes of other capacitors C are connected in parallel and then connected to the output end of the high voltage G6; this RLC circuit has the functions of current limiting, shunt protection circuit components and storage and release of electricity. For the instantaneous load, current increase, and voltage drop of high-voltage discharge to ground ignition, the circuit limits the current and shunts the current through parallel resistors, and connects the inductor L and capacitor C in parallel circuits to instantly release the stored energy to supplement the voltage, maintain the voltage and current balance unchanged, and continuously charge and output, ensure the stable power supply of the reverse resistance high-voltage electrostatic generator, break the traditional technical barriers, and realize the creative transformation of high-voltage electrostatic technology independently applicable to the field of waste circuit board sorting.

[0033] like Figure 3 As shown, the multi-metal sorting mechanism includes the first to third sorting rollers, the first to second permanent magnet rollers, the first sorting roller M34 cooperates with the first arc electrode to form a high-voltage electrostatic field as the first sorting stage; the three groups of sorting rollers are all positive electrodes, and when the granular waste circuit board mixture material enters the electric field, it will obtain sufficient negative ion charge, and the material carrying negative charge will be attracted by the positive electrode sorting roller to adsorb the material on the outer wall of the roller, based on the principle of like repels like and opposites attract; when the granular waste circuit board mixture material falls on the outer wall of the sorting roller, the materials of different properties have different discharge speeds, among which the metal material has the fastest discharge speed, followed by the intermediate material, the intermediate material is the metal and non-metal conjoined particles, and the non-metal material has the slowest discharge speed, and the positions where the above three materials of different properties leave the roller are also different, and the sorting effect is achieved by setting the partition channel.

[0034] The material is sent into the cyclone distributor F2 through the feeding fan F1. The material rotates in the conical cylinder under the action of the airflow to generate centrifugal force, which separates the light and fine dust and discharges it into the non-metal recycling system through the negative pressure channel of the overflow pipe N8; other materials enter the mixed material box F3, and the discharge port of the mixed material box F3 is connected to the rolling discharger F4. The material is discharged through the rolling discharger F4 and evenly distributed on the outer wall of the first classification roller M34 through the sliding plate M37. The fixed electric field force and the centrifugal force generated by the rotation of the first classification roller M34 are used to divide the material into three paths: the first path is copper, iron metal, and large particles. The non-metallic mixed material is thrown into the first material sliding plate channel M11 by the centrifugal force being greater than the electric field force, and then falls on the outer wall of the second classification roller M36; the second path is tin, aluminum metal, and medium-sized non-metallic mixed material, which is attached to the outer wall of the first classification roller M34, and is thrown into the second material sliding plate channel M10 by the centrifugal force when rotating between 150° and 180°, and falls on the outer wall of the third classification roller M35; the third path is small-sized non-metallic particles, which are adsorbed on the outer wall of the first classification roller M34 by the electric field force being greater than the centrifugal force, and rotate with the roller to the 270° position, and the materials are forcibly removed by the first rolling brush M7 arranged there;

[0035] The second sorting roller M36 and the third sorting roller M35 cooperate with the second and third arc electrodes respectively to form a high-voltage electrostatic field as the second sorting stage; the second sorting roller M36 and the third sorting roller M35 are respectively arranged at the two material output ends of the first sorting roller M7, and the second sorting stage also includes the first to third partition channels, wherein the input ends of the first partition channel M14 and the second partition channel M15 are respectively arranged at the second to third material output ends of the second sorting roller M36, and the input end of the third partition channel M17 is arranged at the first material output end of the third sorting roller M35, and the third material output end of the second sorting roller M36 and the first material output end of the third sorting roller M35 converge at the spiral discharger M25 and are discharged to the non-metal recycling box M31; the second output end of the second sorting roller M36 corresponds to the intermediate recycling box M30.

[0036] The second classification roller M36, by setting a fixed electric field force and cooperating with the centrifugal force, separates the materials from different positions of the second classification roller M36 according to the discharge speed of materials of different properties, and divides the materials into three paths, among which: copper and iron mixed metal is the first path, when the metal touches the surface of the second classification roller M36, the charge carried by the metal is instantly released, and it separates from the roller and falls onto the first permanent magnetic roller M19; the intermediate material is the second path: the discharge speed of this material is slower than that of pure metal and is adsorbed on the surface of the second classification roller M36, and rotates with the roller to 150 °~180°, it is thrown out by centrifugal force from the second classification roller M36, enters the first partition channel M14, and falls into the intermediate recovery box M30; the third path is large-size non-metallic materials, which have the slowest discharge speed and are adsorbed on the outer wall of the second classification roller M36. As the roller rotates to the 270° position, the large-size non-metallic materials are forcibly removed by the second rolling brush M39 arranged there, enter the second partition channel M15, and fall into the spiral discharge machine M25, and the materials are discharged and enter the non-metallic recovery box M31;

[0037] The third classification roller M35 is set to cooperate with the fixed electric field force and the centrifugal force, and the materials are separated from the different positions of the third classification roller M35 according to the discharge speed of different material properties, so as to classify the materials into two paths, wherein: tin, aluminum, and iron metals are the first path. When tin, aluminum, and iron metals touch the surface of the third classification roller M35, the electric charge carried by them is instantly released and separated from the roller and falls onto the surface of the second permanent magnet roller M20; medium-sized non-metallic materials are the second path. The discharge speed of this material is the slowest, and they are adsorbed on the outer wall of the third classification roller M35. As the roller rotates to a position of 270°, the medium-sized non-metallic materials are forcibly removed by the third rolling brush M40 arranged therein through the third partition channel M17, and enter the spiral discharge machine M25 to discharge the materials and enter the non-metal recycling box M31.

[0038] The first permanent magnet roller M19 is arranged at the first material output end below the second classification roller M36, and the second permanent magnet roller M20 is arranged at the second material output end below the third classification roller M35, and the two output ends serve as the third sorting stage; the second classification roller M35 and the third classification roller M35 are driven by a transmission mechanism, and the transmission mechanism drive includes a driving wheel and a first to third driven wheel, wherein the driving wheel is installed on the output shaft of the driving motor, the driving wheel is meshed and connected with the first driven wheel, the second driven wheel is fixedly connected with the axis of the first permanent magnet roller M19, the third driven wheel is fixedly connected with the axis of the second permanent magnet roller M20, the driving wheel is connected to the first permanent magnet roller M19 through a first belt and a second driven wheel, and the first driven wheel is connected to the second permanent magnet roller M20 through a second belt and a third driven wheel.

[0039] The copper and iron metals fall onto the surface of the first permanent magnetic roller M19, wherein: the copper metal is thrown out by the centrifugal force, enters the fourth partition channel M23, and falls into the copper recovery box M29; the iron metal is adsorbed on the surface of the first permanent magnetic roller M19 by the magnetic effect, and rotates with the roller to a position of 270 degrees, and is forcibly removed by the first metal scraper M12, enters the fifth partition channel M21, and falls into the first iron metal recovery box M38, thereby achieving separation of copper and iron metals;

[0040] The tin, aluminum and iron mixed metal falls onto the second permanent magnet roller M20 and is divided into two paths: the first path is the tin and aluminum mixed metal, which is thrown into the seventh partition channel M22 under the action of centrifugal force and falls into the electric tin bath M26; the iron metal rotates to 270° with the second permanent magnet roller M20, and is forcibly removed by the second metal scraper M18 arranged therein to enter the sixth partition channel M24 and fall into the second iron recovery box M28.

[0041] The third sorting stage also includes an electric tin bath M26, whose input end is arranged at the second output end of the second permanent magnetic roller M20, and the output end of the electric tin bath M26 serves as the fourth sorting stage; Figure 4 As shown, the electric heating tin bath includes a bracket M261 and an electric heating bath M263, wherein the electric heating bath M263 is rotatably connected to the bracket M261 and an electric heating tube M262 is provided at the bottom of the electric heating bath, the output end of the electric heating tin bath corresponds to the tin-aluminum recovery box, the electric control device M264 controls the electric heating tube M262 to heat, controls the temperature within the melting point range of the tin metal, and melts the powdered tin metal into liquid, the motor is automatically started by the electric control device M264, and the electric heating bath M263 is driven to flip 90° through the motor output shaft and the transmission gear, and the liquid tin metal and the powdered aluminum metal are poured into the tin-aluminum recovery box M27 together. Due to the large difference in melting point and specific gravity between tin metal and aluminum metal, when entering the same container, the liquid tin metal precipitates rapidly, while the powdered aluminum metal completely floats on the surface of the tin metal, and the tin metal is cooled to form a block, which is naturally separated from the aluminum metal, thereby realizing the classified extraction of tin and aluminum metal from waste circuit boards.

[0042] The static eliminator is arranged at the second material stripping plate M10 of the first classification roller M34. Figure 5 As shown, the static eliminator comprises: a high-voltage power supply M32 and a discharge electrode M9; the high-voltage power supply M32 applies high voltage to the discharge electrode M9 for corona discharge, so that the discharge electrode M9 generates positive and negative ions alternately, and comprehensively eliminates the positive and negative charges carried by the material separated by the electrostatic field of the first classification roller M34, so that the material is loose and discharged smoothly, and the problem of material port blockage is solved.

[0043] like Figure 5As shown, the non-metallic recycling mechanism includes a discharge fan N1, a cyclone receiver N2, a dust collector N3, a hopper N4 and a negative pressure exhaust fan N7, wherein the discharge fan N1, the cyclone receiver N2, the dust collector N3 and the negative pressure exhaust fan N7 are connected in sequence through an overflow pipe N8, the air inlet of the discharge fan N1 is connected to the output end of the zeroth sorting stage (i.e., the cyclone distributor F2) of the feeding mechanism, and the output end of the negative pressure exhaust fan N7 is connected to the outside air; the dust collector N3 is provided with a plurality of filters N5 and a back-blowing valve N6, the back-blowing valve N6 is arranged above the filter N5 and corresponding to the air outlet of the dust collector N3, and a hopper N4 is arranged below the dust collector N3;

[0044] The light and fine dust is sucked out and sent to the cyclone receiver N2 through the negative pressure pipe of the discharge fan 46, and the air and the trace dust contained in it enter the dust collector N3 through the overflow pipe N8, and are filtered out by the filter screen N5. The dust is automatically back-blown and cleaned through the back-blowing valve N6, and the dust falls into the hopper N4. The air is purified through the filter screen and discharged into the clean air that meets the standards through the negative pressure exhaust fan N7, realizing the recycling of waste circuit board materials, physical methods, and environmental protection, so that limited resources can be infinitely circulated.

Claims

1. A device for extracting metal from waste circuit boards by reverse resistance high voltage electrostatic classification, characterized in that: include: A reverse resistance high-voltage electrostatic generator, a feeding mechanism, a multi-metal sorting mechanism and a non-metal recycling mechanism, wherein the non-metal recycling mechanism is connected to the zero-level sorting output end of the feeding mechanism, the discharge port of the feeding mechanism is connected to the multi-metal sorting mechanism, and the output end of the multi-metal sorting mechanism is respectively provided with non-metal and various metal recycling boxes; the output end of the reverse resistance high-voltage electrostatic generator and the arc-shaped electrode of the multi-metal sorting mechanism form a high-voltage electrostatic field; The reverse resistance high-voltage electrostatic generator comprises an electric control system, an oil tank, an RLC circuit, a transformer and a rectifier bridge, the output end of the electric control system is connected to the primary coil of the transformer, the output end of the secondary coil of the transformer is connected to the negative input end of the rectifier bridge, the negative output end of the rectifier bridge is connected to the RLC circuit, forming a reverse resistance high-voltage electrostatic generating circuit, and the output end of the reverse resistance high-voltage electrostatic generating circuit forms a high-voltage electrostatic field with the arc electrode of the multi-metal sorting mechanism; The RLC circuit includes multiple resistors, multiple capacitors and an inductor, wherein the multiple resistors are connected in parallel to form a parallel resistor, the positive electrodes of the multiple capacitors are connected in parallel, the inductor is connected between the negative electrodes of two capacitors to form a first node and a second node, the output end of the parallel resistor is connected to the first node, and the negative electrodes of the other capacitors are connected in parallel and then connected to the high voltage output end.

2. The device for extracting metal from waste circuit boards by reverse resistance high voltage electrostatic classification according to claim 1 is characterized in that: The multi-metal sorting mechanism includes first to third sorting rollers and first to second permanent magnet rollers. The first sorting roller cooperates with the first arc electrode to form a high-voltage electrostatic field as the first sorting stage. The second sorting roller and the third sorting roller cooperate with the second and third arc electrodes respectively to form a high-voltage electrostatic field as the second sorting stage; the second sorting roller and the third sorting roller are respectively arranged at the two material output ends of the first sorting roller, the first permanent magnet roller is arranged at the first material output end below the second sorting roller, and the second permanent magnet roller is arranged at the second material output end below the third sorting roller; the first to second permanent magnet rollers are respectively provided with two output ends as the third sorting stage.

3. The device for extracting metal from waste circuit boards by reverse resistance high voltage electrostatic classification according to claim 2 is characterized in that: It also includes an electric heating tin bath, the input end of which is arranged at the second output end of the second permanent magnetic roller, and the output end of the electric heating tin bath serves as the fourth sorting stage.

4. The device for extracting metal from waste circuit boards by reverse resistance high voltage electrostatic classification according to claim 3 is characterized by: The electric heating tin bath comprises a bracket and an electric heating bath, wherein the electric heating bath is rotatably connected to the bracket and an electric heating tube is arranged at the bottom of the electric heating bath, and the output end of the electric heating tin bath corresponds to a tin-aluminum recovery box.

5. The device for extracting metal from waste circuit boards by reverse resistance high voltage electrostatic classification according to claim 2 is characterized in that: The second sorting stage also includes the first to third partition channels, wherein the input ends of the first to second partition channels are arranged at the second to third material output ends of the second sorting roller, the input end of the third partition channel is arranged at the first material output end of the third sorting roller, the third material output end of the second sorting roller and the first material output end of the third sorting roller converge at the spiral discharger and discharge to the non-metal recycling box; the second output end of the second sorting roller corresponds to the intermediate recycling box.

6. The device for extracting metal from waste circuit boards by reverse resistance high voltage electrostatic classification according to claim 2 is characterized by: The output end of the third sorting stage is provided with the first to third recovery boxes, which are respectively a copper recovery box corresponding to the first output end of the first permanent magnet roller, a first iron recovery box corresponding to the second output end of the first permanent magnet roller, and a second iron recovery box corresponding to the first output end of the second permanent magnet roller.

7. The device for extracting metal from waste circuit boards by reverse resistance high voltage electrostatic classification according to claim 2 is characterized by: A metal scraper is arranged on the side surface of each permanent magnetic roller; and a static eliminator is also included, which is arranged at the second material sliding plate of the first classification roller.

8. The device for extracting metal from waste circuit boards by reverse resistance high voltage electrostatic classification according to claim 1 is characterized by: The non-metallic recycling mechanism includes a discharge fan, a cyclone receiver, a dust collector, a hopper and a negative pressure exhaust fan, wherein the discharge fan, the cyclone receiver, the dust collector and the negative pressure exhaust fan are connected in sequence through an overflow pipe, the air inlet of the discharge fan is connected to the zeroth sorting stage output end of the feeding mechanism, and the output end of the negative pressure exhaust fan is connected to the outside air.

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