CN109852810B - Precious metal recovery method for waste circuit board powder - Google Patents
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- CN109852810B CN109852810B CN201910294118.2A CN201910294118A CN109852810B CN 109852810 B CN109852810 B CN 109852810B CN 201910294118 A CN201910294118 A CN 201910294118A CN 109852810 B CN109852810 B CN 109852810B
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Abstract
The invention discloses a precious metal recovery method for waste circuit board powder. Crushing the waste circuit board to obtain mixed powder of the substrate material and the noble metal with consistent particle diameter; setting displacement between waste circuit board powder particles and substrate material particles according to the belt speed of the conveyor belt and the vibration amplitude of the ultrasonic transducer by adopting the following formula; the mixed powder falls on a conveying belt and moves from an input side to an output side for conveying, an ultrasonic transducer is arranged on the side of the conveying belt and sends out acoustic radiation force to the mixed powder on the conveying belt, the speed of the conveying belt and the vibration amplitude of the ultrasonic transducer which meet conditions are set to control the operation of the conveying belt and the work of the ultrasonic transducer, and the substrate material is separated from the noble metal; and setting and controlling different parameters to repeat the steps to carry out screening treatment for multiple times. The method realizes the screening of the precious metals in the waste circuit board powder, and effectively improves the precious metal recovery rate of the waste circuit board powder.
Description
Technical Field
The invention relates to a metal recovery processing method in the technical field of environmental protection, in particular to a method for recovering precious metals in waste circuit board powder.
Background
In recent years, the yield of electronic products is huge, and meanwhile, a large amount of electronic product waste is generated every year, so that the electronic product waste is free of tin, copper and other precious metal components, and has important value in recycling.
Chinese published patent CN103320618A (published japanese 2013.09.25) proposes a method for recovering precious metals from waste printed circuit boards by a combination of physical separation and bioleaching, wherein after fragments of the waste printed circuit boards are broken and high-voltage electrostatic separation is performed, hydrocyanic acid secreted by pseudomonas is used to leach metal mixed particles step by step, single ion solutions of common metals and precious metals are sequentially obtained, and the precious metals and common metals in the solutions are respectively replaced by replacement reaction. The method is simple to operate, but the requirement on the microbial culture environment is high, and the leaching efficiency of valuable metals is low. Chinese published patent CN200910082443.9 (published japanese 2010.10.20) proposes a selective leaching process for separating tin, lead and copper from waste printed circuit boards. Tin and lead are selectively leached with hydrochloric acid and a copper chloride solution for separating tin and lead from copper. However, the high concentration of chloride ions in this process is very corrosive to the equipment and requires higher quality materials for the equipment. Chinese laid-open patent CN101423898 (published japanese 2009.05.06) proposes that a waste printed circuit board is first placed in an oil bath and heated to melt solder, and then the melted waste printed circuit board is effectively separated from the waste printed circuit board by a centrifugal machine, and organic matter and other metals are separated by vacuum pyrolysis. However, this method decomposes certain organics and produces polluting gases upon pyrolysis of the tin. Publication CN101787547A (published japanese 2010.07.28) proposes a method of recovering valuable metals from waste printed circuit boards. The recovery of copper, nickel and precious metals is of major concern. Lead, tin, antimony and aluminum were separated by a melting agent consisting of NaOH — NaNO3, but the amount of the melting agent added was small and the treatment effect was insignificant.
In conclusion, the existing physical separation and biological methods are low in efficiency and high in environmental requirement, and waste liquid and waste gas are generated by adopting chemical related methods, so that the health of operators is influenced and the environmental pollution is caused.
Disclosure of Invention
In order to solve the problems existing in the background technology and solve the problem that the chemical recovery method of the waste circuit board powder pollutes the environment, the invention provides a novel precious metal recovery method of the waste circuit board powder, which controls the displacement of a substrate material in the waste circuit board powder by controlling the movement speed of the waste circuit board powder and the amplitude of an ultrasonic transducer, realizes the screening of the precious metal in the waste circuit board powder and effectively improves the precious metal recovery rate of the waste circuit board powder.
The invention adopts the following technical scheme that the method comprises the following steps:
step 1) crushing the waste circuit board to obtain mixed powder of a substrate material and a noble metal with consistent particle diameter;
step 2) solving the following formula according to the belt speed v of the conveyor belt and the vibration amplitude A of the ultrasonic transducer, and setting the displacement S between the waste circuit board powder particles and the substrate material particles;
wherein R is the powder particle radius, rho0Is the static density of air, psIs the particle density of the substrate material, A is the vibration amplitude of the sound source, f is the vibration frequency of the sound source, c0The sound velocity of air, y is the distance between a mass point and a vibration breadth in sound wave, and L is the width of the transducer; a isyThe second derivative of the distance y, i.e. the acceleration, y (t) represents the displacement at time t;
the substrate material particle displacement S can be adjusted by the belt speed v of the conveyor belt and the vibration amplitude a of the ultrasonic transducer.
Step 3) the mixed powder falls on a conveying belt and moves from an input side to an output side for conveying, an ultrasonic transducer is arranged on the side of the conveying belt and sends out sound radiation force to the mixed powder on the conveying belt, the conveying belt speed v and the vibration amplitude A of the ultrasonic transducer which meet the condition of S & ltSL & gt are set to control the operation of the conveying belt and the operation of the ultrasonic transducer, SL represents a displacement threshold value for separating substrate material particles and noble metal particles, and the noble metal particles with higher density generate displacement deviation due to different densities of the substrate material and the noble metal, so that the substrate material is separated from the noble metal;
and 4) setting and controlling the belt speed v and the vibration amplitude A of the ultrasonic transducer of different conveyor belts, and repeating the step 3) to perform screening treatment for multiple times. Therefore, precious metal powder particles in the waste circuit board powder can be effectively separated, and the purity of precious metals is improved.
The step 4) is specifically as follows:
step 4.1): after the first screening, taking a part of powder products close to the ultrasonic transducer, placing the powder products on a conveyor belt again, moving the conveyor belt from an input side to an output side, and carrying out the next screening;
step 4.2): and setting the belt speed v and the vibration amplitude A of the ultrasonic transducer of the conveyor belt in the following modes at the second screening part: setting a displacement between the waste circuit board powder particles and the substrate material particles to SL2＝λSL1The belt speed v is obtained by inverse solution of the following formula2And the vibration amplitude A of the ultrasonic transducer2；
Wherein SL1Indicating the displacement threshold SL, SL at the first sifting2Represents the displacement threshold SL at the time of the second sifting; the lambda is a displacement attenuation coefficient which is a number greater than 0 and less than 1, and the error screening rate in secondary screening can be reduced by reducing the new displacement value S;
then at the belt speed v2And the vibration amplitude A of the ultrasonic transducer2And controlling the operation of the conveyor belt and the work of the ultrasonic transducer, taking a part of powder products close to the ultrasonic transducer after screening, putting the powder products on the conveyor belt again, moving the powder products from the input side to the output side for carrying out next screening, and repeating the steps for multiple times to obtain the high-purity precious metal.
The noble metal is gold, silver, palladium, copper and the like and alloys thereof, and has excellent conductivity and flexibility.
Therefore, the invention can control the displacement of the substrate material in the waste circuit board powder by controlling the movement speed of the waste circuit board powder and the amplitude of the ultrasonic transducer, realize the screening of the noble metal in the waste circuit board powder and effectively improve the noble metal recovery rate of the waste circuit board powder.
The invention has the beneficial effects that:
1. according to the invention, the separation is carried out by using the acoustic radiation force through the physical property difference between the precious metal in the waste circuit board powder and the substrate material, compared with the traditional chemical method, the complex and harmful chemical agent does not need to be prepared, and the precious metal separation purity can be further improved through repeated separation for many times.
2. The invention relates to a method for recovering noble metal powder from a waste circuit board, which is a green and clean method. No toxic gas, no waste chemical agent, low requirement on environment in the separation process, low noise and no harm to personnel and environment.
Drawings
To further illustrate the description of the present invention, the following detailed description of the embodiments of the present invention is provided with reference to the accompanying drawings. It is appreciated that these drawings are merely exemplary and are not to be considered limiting of the scope of the invention.
FIG. 1 is a schematic diagram of the precious metal recovery process of the present invention.
Fig. 2 is a schematic diagram of the distribution of acoustic radiation force in a standing wave sound field.
FIG. 3 is a graph of substrate material particle displacement versus conveyor belt velocity and ultrasonic amplitude.
Fig. 4 is a schematic three-dimensional structure of the present invention.
Fig. 5 is a sectional view of the structure of the separating apparatus frame.
Fig. 6 is a schematic view of an adjusting bracket structure.
Fig. 7 is a schematic view of a driving motor support structure.
Fig. 8 is a sectional view of the driving wheel structure.
Fig. 9 is a schematic structural view of the driving wheel support.
Figure 10 is a schematic view of a driven axle.
Figure 11 is a cross-sectional view of a tensioner configuration.
Fig. 12 is a schematic view of a tension bracket structure.
Figure 13 is a schematic view of a tensioner axle.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be readily apparent to those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention.
As shown in fig. 4, the present invention is embodied in an apparatus comprising a separating apparatus frame 1, an ultrasonic assembly, a hopper 7 and a conveyor belt 10; two ultrasonic wave assemblies are symmetrically arranged on two sides of the separating device frame 1, a conveying belt 10 is arranged between the two ultrasonic wave assemblies, a hopper 7 is arranged above the conveying belt 10, and waste circuit board crushed materials are placed in the hopper 7; each ultrasonic assembly comprises an adjusting bracket 2 and an ultrasonic generating device 3, the adjusting bracket 2 is fixed on the separating device rack 1, and the ultrasonic generating devices 3 are arranged on the adjusting bracket 2; a driving motor 4, a driving wheel 8, a tension wheel 12, a driving wheel support 9 and a tension support 11 are installed on a separating device rack 1, the driving motor 4 is fixed on the separating device rack 1 through the driving motor support 5, the driving motor 4 is connected with the driving wheel 8 through a coupler 6, the driving wheel 8 is installed on the separating device rack 1 through the driving wheel support 9, the tension wheel 12 is installed on the separating device rack 1 through the tension support 11, and a conveying belt 10 is sleeved on the driving wheel 8 and the tension wheel 12.
Two ultrasonic wave generating device 3 are installed in the conveyer belt 10 both sides through respective regulation support 2 opposition, and two ultrasonic wave generating device 3 probe opposition are located conveyer belt 10 upper surface under, and the transportation is gone up to conveyer belt 10 to the crushing material of waste circuit board in the hopper 7 drop, and the separation is realized to the crushing material loading acoustic radiation force of waste circuit board on conveyer belt 10 through two ultrasonic wave generating device 3.
As shown in fig. 5, which is a structural cross-sectional view of the separator frame 1 of the present invention, the separator frame 1 has two strip-shaped grooves for adjusting the position of the adjusting bracket 2, and a rib plate is provided inside the separator frame for reinforcing the rigidity of the separator frame.
As shown in fig. 6, the adjusting bracket 2 comprises an adjusting bracket upper clamping block 2-2, an adjusting bracket lower clamping block 2-3 and an adjusting bracket fixing plate 2-5; the bottom surface of the upper clamping block 2-2 of the adjusting bracket is provided with a semicircular groove, the top surface of the lower clamping block 2-3 of the adjusting bracket is provided with a semicircular groove, the upper clamping block 2-2 of the adjusting bracket and the semicircular groove of the lower clamping block 2-3 of the adjusting bracket are butted to form a circular groove for installing and fixing a seat part of the ultrasonic wave generating device 3, and the upper clamping block 2-2 of the adjusting bracket and the lower clamping block 2-3 of the adjusting bracket are fixedly connected through an inner hexagon screw 2-1, so that the ultrasonic wave generating device 3 is arranged on the circular groove; the separation device comprises a separation device rack 1, an adjusting bracket fixing plate 2-5, an adjusting bracket lower clamping block 2-3, a bolt 2-4, a nut 2-6 and a bolt 2-3, wherein the adjusting bracket fixing plate 2-5 is arranged below the separation device rack 1, the adjusting bracket lower clamping block 2-3 is arranged above the separation device rack 1, two parallel strip-shaped grooves are formed in the separation device rack 1, each strip-shaped groove is internally provided with the bolt 2-4, the bolts 2-4 penetrate through the strip-shaped grooves, two ends of each bolt are respectively connected with the adjusting bracket fixing plate 2-5 and the adjusting bracket lower clamping block 2-3 and are screwed and fixed through the nuts 2-6, and the adjusting bracket lower clamping block; the mounting positions of the lower clamping blocks 2-3 of the adjusting bracket on the two strip-shaped grooves are adjusted by loosening the nuts 2-6, so that the distance between the ultrasonic generating device 3 and the conveyor belt 10 is adjusted, and the screening effect of the multi-component crushed material is adjusted. The strip-shaped groove on the separating device rack 1 is marked with scales, and the specific implementation is adjusted by observing the scales.
As shown in fig. 7, in order to drive the motor bracket 9 of the present invention, the right side is fixed on the separation device frame 1 by bolts and nuts, and the left side is a screw hole on which the drive motor 4 is mounted by socket head cap screws.
As shown in fig. 8, the present invention drives the wheel 8. The hub is provided with a key slot which is connected with the driving wheel shaft 9-3 through a key and is used for transmitting movement.
As shown in fig. 9 and 10, the driving wheel support 9 comprises a driving wheel shaft 9-3 and two driving wheel support plates 9-4; the driving wheel support plates 9-4 are L-shaped, the horizontal bottoms of the L-shaped driving wheel support plates 9-4 are assembled on the separating device rack 1 through nuts 9-1 and bolts 9-2, the driving wheel shafts 9-3 are supported and sleeved between the vertical side parts of the L-shaped driving wheel support plates 9-4, the driving wheel shafts 9-3 are stepped shafts, as shown in figure 10, circular holes are formed in the vertical side parts of the L-shaped driving wheel support plates 9-4, the driving wheel shafts 9-3 are supported and sleeved between the circular holes of the two driving wheel support plates 9-4, and the driving wheels 8 are coaxially sleeved on the driving wheel shafts 9-3 through keys;
as shown in fig. 11, the tension pulley 12 comprises a tension pulley body 12-1, a bearing 12-2 and a hole circlip 12-3, wherein the tension pulley body 12-1 is provided with a central through hole, the bearing 12-2 is arranged in the center of the central through hole, two annular grooves are arranged on the inner walls of the central through holes at two ends of the bearing 12-2, and the hole circlip 12-3 is embedded in the annular grooves to axially fix the bearing 12-2.
As shown in fig. 12 and 13, the tension bracket 11 includes a tension pulley shaft 11-1 and two tension pulley bracket plates 11-3; the tension wheel support plates 11-3 are L-shaped, the horizontal bottoms of the L-shaped tension wheel support plates 11-3 are assembled on the separating device rack 1 through bolts 11-4 and nuts 11-5, the vertical side parts of the L-shaped tension wheel support plates 11-3 are respectively provided with a waist-shaped hole, the length direction of each waist-shaped hole is parallel to the conveying direction of the conveying belt 10, the tension wheel shaft 11-1 is supported and sleeved between the waist-shaped holes of the two tension wheel support plates 11-3, and the tension wheel 12 is coaxially sleeved on the tension wheel shaft 11-1 through keys; a lug is fixed on the L-shaped vertical side part of one tensioning wheel support plate 11-3, one end of an inner hexagon screw 11-2 is screwed on the lug, the other end of the inner hexagon screw abuts against a tensioning wheel shaft 11-1, the position of the tensioning wheel shaft 11-1 in the kidney-shaped hole groove is adjusted by adjusting screwing-in and screwing-out through the inner hexagon screw 11-2, the shaft distance between the tensioning wheel shaft 11-1 and the driving wheel 8 is adjusted, namely the distance between the driving wheel 8 and the tensioning wheel 12 is adjusted, and the tensioning of the conveying belt 10 is realized.
As shown in fig. 1, the pulverized material includes mixed granules with the same diameter but different masses, the mixed granules are distributed on the conveyor belt 10 in a strip shape parallel to the conveying direction, and move from the input side to the output side under the driving of the conveyor belt 10, and when passing through the ultrasonic wave generating device 3, the mixed granules are subjected to the acoustic radiation force, and the granules with different masses are displaced and deviated, and are deviated to the direction far away from the acoustic radiation force source, and are distributed on the strip shapes at different positions, so that the separation of the granules with different masses in the mixed granules is realized.
The specific steps of the embodiment implemented according to the complete method of the invention are as follows:
step 1, crushing the waste circuit board to obtain a substrate material and precious metal powder with basically consistent particle diameters, wherein the particle diameter of the powder is controlled to be about 100 micrometers.
Step 2, calculating the relative average potential U of the powder particles of the waste circuit board according to the belt speed v of the conveyor belt and the vibration amplitude A of the ultrasonic transduceryAcoustic radiation force FyAnd substrate material particle displacement S.
2.1) calculating the relative mean potential Uy
As shown in FIG. 1, the process of precious metal recovery according to the present invention is schematically illustrated, wherein the conveyor belt is vertically arranged with a connection line of two ultrasonic transducers, and a standing wave sound field is arranged between the two ultrasonic transducers. And establishing a xoy rectangular coordinate system by taking the mixed particles as the origin of coordinates o when the mixed particles just enter the transducer region with the length of L, wherein the transmission belt moves along the direction of the x axis at the speed v. After the mixed particles leave the transducer area, the noble metal and the substrate material form different displacements in the y direction, and the separation of the mixed particles is realized.
Component of relative average potential in y direction:
wherein R is the radius of the sphere in the sound field, u0Is the amplitude of the vibration velocity of the medium mass point, u0＝2Aω，ρ0Is a medium static density, k0Is wave number, k0＝ω/c0。
2.2) calculating the acoustic radiation force Fy
By calculating the first derivative of the equation in the y direction, the distribution of the acoustic radiation force of the spherical particles in the y direction can be obtained:
in the formula, FyIs the acoustic radiation force.
As shown in fig. 2, the distribution of acoustic radiation force in a standing wave acoustic field. λ is the ultrasonic wavelength, and the graph shows the acoustic radiation force distribution when the incident end is 1.5 λ away from the reflection end. According to the standing wave sound field theory, sound pressure nodes exist in the sound field, namely the position of a time-average potential well of the sound field. Objects in the sound field tend to be captured by the sound field to the sound pressure node. When the target is disturbed and deviates from the potential well position, the target is subjected to the acoustic radiation force opposite to the movement direction and returns to the potential well position again.
2.3) calculating the substrate Material particle Displacement S
Because the noble metal particles have high density, the acceleration of the acoustic radiation force obtained by the above formula is small, and the acceleration of the substrate material particles is large and is greatly influenced by the acoustic radiation force. Here, the acoustic radiation force on the noble metal particles is neglected, and the frictional force on the substrate material particles is neglected. The substrate material particles are subjected to radiation force to separate the noble metal particles from the waste circuit board powder, thereby screening and separating the noble metal particles from the waste circuit board powder.
The calculation formula of the substrate material particle displacement S is as follows:
S＝y(t0)
in this embodiment, the parameters are evaluated, the transducer frequency f is 20000Hz, and the sound velocity c in the air medium is0340m/s, air medium density ρ0＝1.29kg/m3Substrate material particle density ρs＝2100kg/m3Initial position y02mm and the transducer width L16 mm.
Solving the particle displacement expression is to solve the transcendental equation, and the expression cannot be written. The vibration frequency f of the ultrasonic transducer is given, and the corresponding relation between the particle displacement and the speed v of the conveyor belt and the vibration amplitude A of the ultrasonic transducer is obtained through a numerical solution method, as shown in figure 3.
And 3, setting a displacement threshold SL for separating the substrate material particles and the noble metal particles. The conveyor belt speed v and the ultrasonic transducer vibration amplitude a are selected as appropriate for satisfying the conditions.
The substrate material displacement S in fig. 3 has a maximum limit corresponding to the maximum displacement of the particles that cannot exceed the distance between the sound pressure nodes in the sound field. In the present embodiment, the shift threshold is taken as SL1＝4.4mm。
Given the ultrasonic transducer vibration frequency f, the particle displacement S is tabulated below in relation to the conveyor belt velocity v and the ultrasonic transducer vibration amplitude a:
TABLE 1 table of correspondence of particle displacement to conveyor belt speed and ultrasonic amplitude
Note: in the table, the unit of particle displacement is mm
Finding satisfying the condition that the shift S is approximately equal to SL1The required parameters are: speed v of the conveyor belt10.0658m/s, vibration amplitude A of ultrasonic transducer18.6842 μm. At this time, the substrate material was displaced by s 4.3980mm, and the remaining noble metal particles were charged into the corresponding collection container,
and 4, screening for multiple times.
Step 4.1), after primary screening, taking a part of powder products close to the ultrasonic transducer after screening, placing the powder products on a conveyor belt again, moving the powder products from an input side to an output side, and carrying out next screening;
step 4.2), taking gamma as 0.8, and setting the displacement for the second screening as SL2＝γSL10.8 x 4.4 x 3.52mm, the second belt speed v is selected2＝0.0684m/s，A26.8421 μm. At this time, the substrate material was displaced by s 3.5084mm, and the remaining noble metal particles were charged into the corresponding collection container.
Step 4.3) third screening to set the shift as SL3＝γSL20.8 x 3.52mm 2.816mm, the second belt speed v is selected2＝0.0605s，A25 m. At this time, the substrate material is displaced by s 2.7056, and the noble metal particles are loaded into the corresponding collection container.
And 4.4) obtaining the precious metal particles in the high-purity waste circuit board powder through the three-time screening. Compared with the traditional chemical method, the method does not need to prepare complex and harmful chemical agents, and is a green and clean method.
The foregoing embodiments are merely illustrative of the principles and effects of the present invention, and are not to be construed as limiting the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or variations be covered by the claims without departing from the spirit and technical spirit of the present invention.
Claims (3)
1. A precious metal recovery method for waste circuit board powder is characterized by comprising the following steps:
step 1) crushing the waste circuit board to obtain mixed powder of a substrate material and a noble metal with consistent particle diameter;
step 2) solving the following formula according to the belt speed v of the conveyor belt and the vibration amplitude A of the ultrasonic transducer, and setting the displacement S between the waste circuit board powder particles and the substrate material particles;
wherein R is the powder particle radius, rho0Is the static density of air, psIs the particle density of the substrate material, A is the vibration amplitude of the sound source, and f isVibration frequency of sound source, c0The sound velocity of air, y is the distance between a mass point and a vibration breadth in sound wave, and l is the width of the transducer; a isyThe second derivative of the distance y, i.e. the acceleration, y (t) represents the displacement at time t;
step 3) the mixed powder falls on a conveying belt and moves from an input side to an output side for conveying, an ultrasonic transducer is arranged on the side of the conveying belt and sends out sound radiation force to the mixed powder on the conveying belt, the conveying belt speed v and the vibration amplitude A of the ultrasonic transducer which meet the condition of S & ltSL & gt are set to control the operation of the conveying belt and the operation of the ultrasonic transducer, SL represents a displacement threshold value for separating substrate material particles and noble metal particles, the noble metal particles with higher density generate displacement deviation, and the substrate material and the noble metal are separated;
and 4) setting and controlling the belt speed v and the vibration amplitude A of the ultrasonic transducer of different conveyor belts, and repeating the step 3) to perform screening treatment for multiple times.
2. A precious metal recovery method for waste circuit board powder according to claim 1, wherein: the step 4) is specifically as follows:
step 4.1): after the first screening, taking a part of powder products close to the ultrasonic transducer, placing the powder products on a conveyor belt again, moving the conveyor belt from an input side to an output side, and carrying out the next screening;
step 4.2): and setting the belt speed v and the vibration amplitude A of the ultrasonic transducer of the conveyor belt in the following modes at the second screening part: setting a displacement between the waste circuit board powder particles and the substrate material particles to SL2＝λSL1The belt speed v is obtained by inverse solution of the following formula2And the vibration amplitude A of the ultrasonic transducer2；
Wherein SL1Indicating the displacement threshold SL, SL at the first sifting2Represents the displacement threshold SL at the time of the second sifting; λ is the displacement attenuation coefficient;
then at the belt speed v2And the vibration amplitude A of the ultrasonic transducer2And controlling the operation of the conveyor belt and the work of the ultrasonic transducer, taking a part of powder products close to the ultrasonic transducer after screening, putting the powder products on the conveyor belt again, moving the powder products from the input side to the output side for carrying out next screening, and repeating the steps for multiple times to obtain the precious metal.
3. A precious metal recovery method for waste circuit board powder according to claim 1, wherein: the noble metal is gold, silver, palladium and alloy thereof.
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| CN101612628A (en) * | 2009-07-10 | 2009-12-30 | 广东工业大学 | The separation of each component material and recovery method in a kind of waste and old printed circuit board |
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