CN112139216B - Harmless and recycling system and method for mercury-containing lamp tube of backlight source of liquid crystal display product - Google Patents
Harmless and recycling system and method for mercury-containing lamp tube of backlight source of liquid crystal display product Download PDFInfo
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- CN112139216B CN112139216B CN202010972133.0A CN202010972133A CN112139216B CN 112139216 B CN112139216 B CN 112139216B CN 202010972133 A CN202010972133 A CN 202010972133A CN 112139216 B CN112139216 B CN 112139216B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
- B09B3/80—Destroying solid waste or transforming solid waste into something useful or harmless involving an extraction step
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE
- B09B5/00—Operations not covered by a single other subclass or by a single other group in this subclass
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/82—Recycling of waste of electrical or electronic equipment [WEEE]
Abstract
The invention discloses a system and a method for harmlessly recycling mercury-containing lamp tubes of a backlight source of a liquid crystal display product; the invention selectively crushes the liquid crystal display backlight lamp tubes by a targeted multistage crushing-multistage sorting combined process, and separates out valuable components in steps. Multistage breakage includes in proper order: horizontal knife crushing, double-roller crushing and shearing crushing. Multistage sorting includes in proper order: multistage vibration screening, magnetic separation and roller cleaning. The invention can realize complete separation and classified recovery of glass, fluorescent powder, rubber lamp caps and ferromagnetic metal by organically combined determined crushing and sorting processes; meanwhile, the invention has the advantages of no chemical reaction, no pollution, no waste water and gas emission, high resource rate, simple process equipment and the like, and is suitable for fluorescent tube recycling enterprises and electronic waste recycling enterprises.
Description
Technical Field
The invention relates to the technical field of solid waste recycling, in particular to a system and a method for harmlessly recycling mercury-containing lamp tubes of a backlight source of a liquid crystal display product.
Background
In the current society, the development of electronic information technology is changing day by day, and image display electronic products are continuously advancing. After the twenty-first century, the cathode ray tube display (CRT) of computers was gradually replaced by Liquid Crystal Display (LCD). The household CRT television is gradually replaced by the liquid crystal television. According to statistics of Digimimes Research, the global liquid crystal display television delivery in 2019 is increased by 1.7 to 2.18 hundred million units in the same ratio, and is continuously and gently increased to 2.36 hundred million units in 2023, and the composite annual growth rate of the next five years is 1.6 percent. The large amount of usage means a large amount of scrap in the future. It is important to safely and properly recycle the waste water.
The technical policy on pollution control of waste household appliances and electronic products (release 2006) 115 in China stipulates that "the cold cathode fluorescent lamp tube detached from the backlight module can be sent to a professional mercury recovery plant to recover mercury, or is disposed of together with other mercury-containing fluorescent lamp tubes according to dangerous waste". Therefore, electronic waste dismantling enterprises usually send the liquid crystal display products backlight mercury-containing lamp tubes (hereinafter referred to as "backlight lamp tubes") to lamp tube recycling enterprises qualified for hazardous waste treatment after dismantling the lamp tubes.
However, at present, the equipment and process of lamp recycling enterprises are developed and designed for straight or special fluorescent lamps for lighting. The following two types of methods are generally employed:
(1) Crushing the whole lighting fluorescent lamp tube, performing vortex sorting, separating a metal lamp holder and glass with fluorescent powder, and screening or cleaning the fluorescent powder on the glass;
(2) And cutting off and recycling the metal lamp caps at two ends of the lighting fluorescent lamp tube, and recycling the fluorescent powder by air flow blowing or water flow scouring to finally obtain clean glass.
Both types of recycling equipment and processes are only suitable for handling relatively large fluorescent lighting tubes. The diameter of the lighting fluorescent lamp tube is generally 3 to 5 cm, and the lamp cap is generally an aluminum cap. The backlight source lamp tube is generally slender in shape, the diameter of the lamp tube is 2 to 3 mm, and the diameter of the lamp cap is 5 to 8 mm, wherein the lamp cap is a rubber cap wrapping a metal head. The following problems arise when handling backlight tubes with an apparatus for handling illuminating fluorescent tubes:
(1) The glass column of the backlight lamp tube is not completely crushed, the crushing process only crushes the lamp tube into a section of glass column, and the glass column of the lamp tube cannot be completely crushed into sheets. The fluorescent powder is still wrapped in the lamp tube, so that the fluorescent powder cannot be effectively separated from the glass in the subsequent operation;
(2) The original production line of the lamp tube recycling enterprise is designed for metal aluminum cap lamp holders, the lamp holders of the backlight lamp tubes are made of elastic rubber, and the backlight lamp tubes are small and elastic and cannot be completely crushed in a crusher, so that the rubber lamp holders wrap the metal heads and enter a sorting link;
(3) The rubber lamp cap of the backlight lamp tube has small particle size and is non-metallic, and cannot be effectively separated from glass by processes such as vortex separation and the like an aluminum cap. Meanwhile, the rubber lamp cap and the metal head part inside the rubber lamp cap cannot be effectively separated.
Because of the above problems, many lamp recycling enterprises are difficult to handle after receiving the backlight lamp, and only can accumulate the backlight lamp in a warehouse to wait for a clean and efficient special technical method and process for the backlight lamp.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a system and a method for harmlessly recycling mercury-containing lamp tubes of a backlight source of a liquid crystal display product; the whole recovery treatment system adopts a physical process, has no chemical reaction, no waste water and waste gas emission, and can realize the purpose of cleaning, efficiently and harmlessly recycling the mercury-containing lamp tube of the backlight source of the liquid crystal display product.
In the invention, through a targeted multistage crushing-multistage sorting combined process, the liquid crystal display backlight lamp tube is selectively crushed, and valuable components are separated in steps. Multistage breakage includes in proper order: horizontal knife crushing, double-roller crushing and shearing crushing. Multistage separation includes in proper order: multistage vibration screening, magnetic separation and roller cleaning. The invention can realize complete separation and classified recovery of glass, fluorescent powder, rubber lamp caps and ferromagnetic metal by organically combined determined crushing and sorting processes. The technical solution of the present invention is as follows.
A liquid crystal display product backlight mercury-containing lamp tube harmless and resource recovery system comprises a transverse knife crusher, a double-roller crusher, a multi-stage vibrating screening machine, a shearing crusher, a first magnetic separator, a second magnetic separator and a roller cleaning machine; the discharge port of the transverse knife crusher is connected with a first bin, the first bin is connected with a double-roller crusher through a first conveyor, the discharge port of the double-roller crusher is connected with a second bin, the second bin is connected with a multistage vibrating screening machine through a second conveyor, the discharge port of the multistage vibrating screening machine is respectively connected with an oversize bin and an undersize bin, the oversize bin is connected with a shearing crusher through a third conveyor, and the undersize bin is connected with a second magnetic separator through a fifth conveyor; wherein: the discharge port of the shearing crusher is connected with a shearing crushing bin, the shearing crushing bin is connected with the first magnetic separator through a fourth conveyor, and the discharge port of the first magnetic separator is respectively connected with a first ferromagnetic metal bin and a rubber particle bin; the discharge gate of second magnet separator is connected second ferromagnetic metal feed bin and glass phosphor powder mixing bunker respectively, and glass phosphor powder mixing bunker links to each other with the cylinder cleaning machine via sixth conveyer, and the discharge gate of cylinder cleaning machine links to each other with clean glass feed bin and phosphor powder feed bin.
Preferably, the cross knife crusher comprises a shell and a cross knife rotor, wherein the shell is of a horizontal cylindrical structure, the cross knife rotor is of a grid type and is arranged in the shell and driven by a motor, a feed port is formed above the shell, a discharge port is formed below the shell, and a large-diameter screen of 5 to 8 cm is arranged on the discharge port; first feed bin sets up in discharge gate below.
Preferably, the working distance between the two rollers of the roller crusher ranges from 1 to 5 mm.
Preferably, the screen hole diameter in the multistage vibrating screen machine is 3-5 mm.
Preferably, a discharge port of the shearing crusher is provided with a screen with the aperture of 8-12 mm.
Preferably, the screen hole diameter in the roller cleaning machine is 0.1 to 0.3 mm.
Preferably, the whole set of equipment is in a completely sealed and negative pressure state, the pipeline and the equipment are provided with air suction ports, and the air suction pipeline leads to the bag-type dust remover to prevent dust from escaping.
The invention also provides a harmless and recycling method based on the harmless and recycling system, which comprises the following steps:
(1) Sending the backlight source lamp tubes into a cross-knife crusher, performing breaking type crushing on the backlight source lamp tubes to obtain primary crushed lamp tubes, and feeding the primary crushed lamp tubes into a first bin;
(2) Conveying the primary crushing lamp tube in the first storage bin in the step (1) to a double-roller crusher at a certain feeding rate through a first conveyor to obtain a secondary crushing lamp tube, and feeding the secondary crushing lamp tube into a second storage bin;
(3) Feeding the second-stage crushing lamp tube in the second bin in the step (2) to a multi-stage vibration screening machine through a second conveyor to obtain oversize materials and undersize materials, and respectively feeding the oversize materials and the undersize materials into an oversize bin and an undersize bin;
(4) Feeding the oversize material obtained in the step (3) to a shearing crusher through a third conveyor to obtain a shearing crushed material, and feeding the shearing crushed material into a shearing crushed material bin;
(5) Feeding the sheared and crushed materials in the step (4) to a first magnetic separator through a fourth conveyor, separating to obtain ferromagnetic metal materials and rubber particle materials, and storing the ferromagnetic metal materials and the rubber particle materials into a first ferromagnetic metal bin and a rubber particle bin;
(6) Feeding the screened material in the step (3) to a second magnetic separator through a fifth conveyor to obtain a mixture of ferromagnetic metal materials and glass fluorescent powder, and storing the mixture into a second ferromagnetic metal bin and a glass fluorescent powder mixing bin;
(7) Feeding the glass fluorescent powder mixture obtained in the step (6) to a roller cleaning machine through a sixth conveyor to obtain clean glass materials and fluorescent powder, and storing the clean glass materials and the fluorescent powder in a clean glass bin and a fluorescent powder bin.
Preferably, in the step (1), the length of the backlight lamp tube is 300 to 1400 mm, and the diameter is 2 to 3 mm.
Preferably, in the step (1), the rotation speed of the cross-knife crusher is 60 to 300 r/min, and at this time, the backlight lamp tube can be broken into glass columns with the length of 1 to 8 cm.
In the invention, the working principle of the harmless and resource recovery system of the mercury-containing lamp tube of the backlight source of the liquid crystal display product is as follows:
(1) The horizontal knife crusher is used for cutting a long and thin backlight lamp tube with the length ranging from 300 mm to 1400 mm into a material with a smaller length, and feeding the roll crusher. If the backlight source lamp tube is not crushed by the cross knife, the backlight source lamp tube is supported at the feed inlet of the double-roller crusher because of too long length and cannot enter the double-roller crusher;
(2) The double-roll crusher is used for crushing a backlight lamp tube glass column with the diameter of 2-3 mm into glass sheets, and simultaneously ensuring that a rubber lamp holder is not crushed and integrity is reserved;
(3) Sorting by a multistage vibrating screen machine through a 3-5 mm screen, wherein the obtained screen material is a rubber lamp cap, and the screen material is a glass fluorescent powder mixture and a small amount of ferromagnetic metal;
(4) The shearing crusher is used for crushing the rubber lamp cap and dissociating the rubber cap and the metal head wrapped inside;
(5) The first magnetic separator is used for separating ferromagnetic metal materials and rubber particle materials;
(6) The second magnetic separator is used for separating a small amount of ferromagnetic metal from the glass fluorescent powder mixture;
(7) The roller cleaning machine utilizes the self-friction principle to grind and remove the fluorescent powder adhered on the sheet lamp tube glass, thereby realizing the separation of the glass and the fluorescent powder.
Compared with the prior art, the invention has the beneficial effects that:
the invention can realize complete separation and classified recovery of all components of the mercury-containing lamp tube of the backlight source of the liquid crystal display product. The method is a function which cannot be realized by the existing processing method of the lighting fluorescent tube. Meanwhile, the whole recovery process has no pollution, no chemical reaction, no wastewater and waste gas discharge, high resource rate and simple process equipment, and is suitable for fluorescent tube recovery processing enterprises and electronic waste recovery processing enterprises.
Drawings
Fig. 1 is a schematic structural diagram of a harmless and recycling system for mercury-containing fluorescent tubes of a backlight source of a liquid crystal display product.
Fig. 2 is a structure diagram (left) of the whole horizontal-blade crusher and a schematic diagram (right) of a horizontal-blade rotor.
FIG. 3 is a flow chart of the harmless and recycling method of mercury-containing lamp tube of backlight source of liquid crystal display products of the present invention.
The reference numbers in the figures:
1-feeding device, 2-cross-blade crusher, 3-first bin, 4-first conveyor, 5-pair-roller crusher, 6-second bin, 7-second conveyor, 8-multistage vibrating screening machine, 9-oversize bin, 10-third conveyor, 11-shearing crusher, 12-shearing crushing bin, 13-fourth conveyor, 14-first magnetic separator, 15-undersize bin, 16-fifth conveyor, 17-second magnetic separator, 18-glass fluorescent powder mixing bin, 19-sixth conveyor, 20-roller cleaning machine, 21-air suction pipeline, 22-bag dust collector, 23-cross-blade crusher feeding port, 24-cross-blade rotor, 25-shell, 26-motor and 27-cross-blade crusher discharging port.
Detailed Description
The invention is further described below with reference to examples and figures, but the scope of the invention should not be limited thereby.
Example 1
FIG. 1 is a schematic structural diagram of a mercury-containing lamp tube harmless and recycling system of a liquid crystal display product backlight source. Fig. 2 is a structural diagram of the whole horizontal-blade crusher and a rotor schematic diagram.
As shown in fig. 1 to 2, the magnetic separator comprises a horizontal knife crusher 2, a double-roll crusher 5, a multistage vibrating screening machine 8, a shearing crusher 11, a first magnetic separator 14, a second magnetic separator 17 and a roller cleaning machine 20; the cross-knife crusher comprises a shell 25 and a cross-knife rotor 24, wherein the shell 25 is of a horizontal cylindrical structure, the cross-knife rotor 24 is of a grid type and is arranged in the shell and driven by a motor 26, a cross-knife crusher feed inlet 23 is formed above the shell 25, a cross-knife crusher discharge outlet 27 is formed below the shell, and a large-caliber screen of 5 to 8 cm is arranged on the cross-knife crusher discharge outlet 27; the first silo 3 is arranged below the discharge port 27 of the cross-knife crusher. The first bunker 3 is connected with a double-roller crusher 5 through a first conveyor 4, and the working distance between two rollers of the double-roller crusher 5 ranges from 1 mm to 5 mm. The manufacturer and brand of the double-roll crusher 5 are not limited, and the model and working parameters are selected according to the design throughput. The discharge port of the double-roller pulverizer 5 is connected with a second material bin 6, the second material bin 6 is connected with a multistage vibrating screen classifier 8 through a second conveyor 7, and the screen aperture in the multistage vibrating screen classifier 8 is 3-5 mm. The manufacturer and the brand of the vibration screening machine are not limited, and the model and the working parameters are selected according to the design treatment amount. The discharge port of the multistage vibrating screen machine 8 is respectively connected with an oversize bin 9 and an undersize bin 15, the oversize bin 9 is connected with a shearing crusher 11 through a third conveyor 10, the discharge port of the shearing crusher 11 is connected with a shearing crushing bin 12, and a screen with the aperture of 8-12 mm is arranged at the discharge port of the shearing crusher 11. The shearing and crushing bin 12 is connected with a first magnetic separator 14 through a fourth conveyor 13, and a discharge port of the first magnetic separator 14 is respectively connected with a first ferromagnetic metal bin and a rubber particle bin; the undersize bin 15 is connected with a second magnetic separator 17 through a fifth conveyor 16; the discharge port of the second magnetic separator 17 is respectively connected with a second ferromagnetic metal bin and a glass fluorescent powder mixing bin 18, the glass fluorescent powder mixing bin 18 is connected with a roller cleaning machine 20 through a sixth conveyor 19, and the aperture of a screen mesh in the roller cleaning machine 20 is 0.1-0.3 mm. The manufacturer and brand of the drum washing machine 20 are not limited, and the model and the operating parameters are selected according to the design throughput. The discharge port of the roller cleaning machine 20 is connected with the clean glass bin and the fluorescent powder bin.
The whole set of equipment is in a completely sealed and negative pressure state, and air suction ports are arranged on pipelines and equipment and are communicated with a bag-type dust collector 22 through an air suction pipeline 21 so as to prevent dust from escaping.
As shown in fig. 3, when the system of the present invention is used for harmless and recycling of mercury-containing lamps in a backlight source of a liquid crystal display product, the lamps in the backlight source of the liquid crystal display product are selectively crushed by a targeted multistage crushing-multistage sorting combination method, and then valuable components are separated step by step. Taking an example of processing 240 kg of backlight lamp tubes per hour, the implementation process comprises the following specific steps:
(1) And (4) conveying the backlight source lamp tube to a feeding hole 23 of the cross knife crusher, and feeding the backlight source lamp tube into the cross knife crusher 2 in batches at a feeding frequency of 4 kg/min. A transverse knife rotor 24 of the transverse knife crusher 2 rotates at a preferred speed of 200 r/min to crush backlight lamps;
(2) The backlight lamp tube crushed by the cross knife crusher 2 is broken into glass columns with the length of 1-8 cm. And a discharge port below the crushing cavity is provided with a preferred 6 cm large-caliber screen used for passing through the crushed first-stage crushing lamp tube. The crushed material enters a first bin. At the moment, the rubber lamp holder is still connected with the glass column;
(3) The primary crushing lamps in the first silo 3 are conveyed to the double-roll crusher 5 by a first conveyor 4 at a material conveying capacity of 4 kg/min. The roller crusher 5 is 2PG0425 type produced by Luoyang Zhongde heavy industry Co., ltd, and the backlight lamp tube glass column can be crushed into sheet glass completely by crushing under the condition of the preferable 2 mm distance between the rollers, and the rubber lamp holder is kept intact and is completely separated from the glass. The crushed secondary crushing lamp tube enters a second stock bin 6;
(4) Feeding the two-stage crushing lamp tube in the second bin 6 to a multi-stage vibration screening machine 8 through a second conveyor 7, wherein the multi-stage vibration screening machine 8 selects ZK1022 type produced by Shanghai American environmental protection equipment GmbH, and an oversize material (yield 1 kg/min) and an undersize material (yield 3 kg/min) can be obtained through a preferred screen mesh aperture of 4 mm and respectively enter an oversize bin 9 and an undersize bin 15. The material on the screen is a complete rubber lamp holder, and the material on the screen is a sheet-shaped glass fluorescent powder mixture and a small amount of ferromagnetic metal. The weight ratio of the material on the screen to the material under the screen is 1:3;
(5) Feeding the oversize materials into a shearing crusher 11 by a third conveyor 10 at a material conveying amount of 1 kg/min, wherein the shearing crusher 11 is a 1000X 400 type manufactured by Suzhou Richent electro-mechanical Co., ltd, crushing the materials, and then passing the materials through a preferable discharging screen with the size of 8 mm to obtain mixed and completely dissociated rubber materials and ferromagnetic metal materials which serve as shearing crushed materials and enter a shearing crushing bin 12;
(6) Feeding the sheared and crushed materials to a first magnetic separator 14 through a fourth conveyor 13 at a material conveying amount of 1 kg/min, wherein the magnetic separator is a CT406 type manufactured by Shanghai Ming dynasty's heavy equipment Co., ltd, and can separate clean ferromagnetic metal materials and rubber particle materials which are respectively stored in a first ferromagnetic metal bin and a rubber particle bin;
(7) Feeding the sieved materials to a second magnetic separator 17 through a fifth conveyor 16 at the material conveying capacity of 3 kg/min, separating a small amount of ferromagnetic metals (the yield is 0.04 kg/min) in a glass fluorescent powder mixture (the yield is 2.96 kg/min), and storing the mixture in a second ferromagnetic metal bin and a glass fluorescent powder mixture bin 18;
(8) Feeding the glass fluorescent powder mixture into a roller cleaning machine by a sixth conveyor at the material conveying capacity of 3 kg/min, selecting a GFM-RTW model produced by Shanghai Guofeng mechanical equipment Limited, separating the fluorescent powder from the glass by rolling friction, separating by a preferred 0.2 mm sieve mesh to obtain clean glass materials and fluorescent powder, and storing in a clean glass bin and a fluorescent powder bin.
In the whole recovery process, all equipment and pipelines are in a closed negative pressure state, and the pipelines and the equipment are all provided with air suction openings and air suction pipelines 21 which are communicated with a bag-type dust remover 22 so as to prevent dust from escaping.
Through the steps, the recovery system and the recovery method have the following characteristics:
(1) The method can completely dissociate each component in the backlight lamp tube and realize classified recovery, which is a function that the existing method for processing the illumination fluorescent lamp tube can not realize;
(2) The whole recovery process has no pollution, no chemical reaction, no wastewater and waste gas discharge, high resource rate and simple process equipment, and is suitable for fluorescent tube recovery processing enterprises and electronic waste recovery processing enterprises.
Claims (4)
1. A liquid crystal display product backlight mercury-containing lamp tube harmless and resource recovery system is characterized by comprising a transverse tube
The device comprises a knife crusher, a double-roller crusher, a multi-stage vibrating screening machine, a shearing crusher, a first magnetic separator, a second magnetic separator and a roller cleaning machine; the discharge port of the cross-knife crusher is connected with a first bin, the first bin is connected with a double-roller crusher through a first conveyor, the discharge port of the double-roller crusher is connected with a second bin, the second bin is connected with a multistage vibrating screening machine through a second conveyor, the discharge port of the multistage vibrating screening machine is respectively connected with an oversize bin and an undersize bin, the oversize bin is connected with a shearing crusher through a third conveyor, and the undersize bin is connected with a second magnetic separator through a fifth conveyor; wherein: the discharge port of the shearing crusher is connected with a shearing crushing bin, the shearing crushing bin is connected with the first magnetic separator through a fourth conveyor, and the discharge port of the first magnetic separator is respectively connected with a first ferromagnetic metal bin and a rubber particle bin; a discharge port of the second magnetic separator is respectively connected with a second ferromagnetic metal bin and a glass fluorescent powder mixing bin, the glass fluorescent powder mixing bin is connected with the roller cleaning machine through a sixth conveyor, and a discharge port of the roller cleaning machine is connected with a clean glass bin and a fluorescent powder bin; wherein:
the horizontal knife crusher is used for performing breaking type crushing on the backlight source lamp tube so as to realize feeding of the roller crusher; the double-roller crusher is used for crushing the backlight lamp tube glass column crushed by the cross-cutter crusher into glass sheets and simultaneously ensuring that the rubber lamp holder is not crushed; the screen material of the multistage vibrating screen classifier is a rubber lamp cap, and the screen material is glass fluorescent powder mixture and ferromagnetic metal; the shearing crusher is used for crushing the rubber lamp cap and dissociating the rubber cap and the metal head wrapped inside; the first magnetic separator is used for separating ferromagnetic metal materials and rubber particle materials; the second magnetic separator is used for separating ferromagnetic metal from the glass fluorescent powder mixture; the roller cleaning machine utilizes the self-friction principle to grind and remove the fluorescent powder adhered on the sheet lamp tube glass, thereby realizing the separation of the glass and the fluorescent powder; wherein:
the cross knife crusher comprises a shell and a cross knife rotor, wherein the shell is of a horizontal cylindrical structure, the cross knife rotor is of a grid type and is arranged in the shell and driven by a motor, a feed port is formed above the shell, a discharge port is formed below the shell, and a large-diameter screen with the diameter of 5 to 8 cm is arranged on the discharge port; the first storage bin is arranged below the discharge port; the range of the working distance between two rollers of the double-roller crusher is 1 to 5 mm; the aperture of a screen in the multistage vibrating screening machine is 3 to 5 mm; a discharge port of the shearing crusher is provided with a screen with the aperture of 8-12 mm; the aperture of the screen mesh in the roller cleaning machine is 0.1 to 0.3 mm.
2. A harmless and resource recovery method, which adopts the harmless and resource recovery system of the mercury-containing lamp tube of the liquid crystal display product backlight source in claim 1, is characterized by comprising the following steps:
(1) Sending the backlight lamp tube into a horizontal knife crusher, performing breaking type crushing on the backlight lamp tube to obtain a primary crushed lamp tube, and entering a first storage bin;
(2) Conveying the primary crushing lamp tube in the first storage bin in the step (1) to a double-roller crusher at a certain feeding rate through a first conveyor to obtain a secondary crushing lamp tube, and feeding the secondary crushing lamp tube into a second storage bin;
(3) Feeding the second-stage crushing lamp tubes in the second storage bin in the step (2) to a multi-stage vibration screening machine through a second conveyor to obtain oversize materials and undersize materials, and respectively entering the oversize material bins and the undersize material bins;
(4) Feeding the oversize material in the step (3) to a shearing crusher through a third conveyor to obtain a shearing crushed material, and feeding the shearing crushed material into a shearing crushing bin;
(5) Feeding the sheared and crushed materials in the step (4) to a first magnetic separator through a fourth conveyor, separating to obtain ferromagnetic metal materials and rubber particle materials, and storing the ferromagnetic metal materials and the rubber particle materials into a first ferromagnetic metal bin and a rubber particle bin;
(6) Feeding the screened material in the step (3) to a second magnetic separator through a fifth conveyor to obtain a mixture of ferromagnetic metal materials and glass fluorescent powder, and storing the mixture into a second ferromagnetic metal bin and a glass fluorescent powder mixing bin;
(7) Feeding the glass fluorescent powder mixture obtained in the step (6) to a roller cleaning machine through a sixth conveyor to obtain clean glass materials and fluorescent powder, and storing the clean glass materials and the fluorescent powder in a clean glass bin and a fluorescent powder bin.
3. The method for recycling and making harmless resources according to claim 2, wherein in the step (1), the length of the backlight lamp tube is 300 to 1400 mm, and the diameter is 2 to 3 mm.
4. The harmless and resource recovery method according to claim 2, wherein in the step (1), the rotation speed of the cross-cutter crusher is 60 to 300 r/min.
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| CN202010972133.0A CN112139216B (en) | 2020-09-16 | 2020-09-16 | Harmless and recycling system and method for mercury-containing lamp tube of backlight source of liquid crystal display product |
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| CN202010972133.0A CN112139216B (en) | 2020-09-16 | 2020-09-16 | Harmless and recycling system and method for mercury-containing lamp tube of backlight source of liquid crystal display product |
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| CN100400168C (en) * | 2004-07-26 | 2008-07-09 | 大连力达环境工程有限公司 | Method for processing worn-out fluorescent tube |
| EP2512699B1 (en) * | 2009-12-16 | 2016-08-03 | University of Limerick | Removal of hazardous substances from lcd displays |
| NL1037665C2 (en) * | 2010-01-29 | 2011-08-03 | Gansewinkel Groep B V Van | PROCESSING OF FLAT SCREENS. |
| GB2507817A (en) * | 2012-11-13 | 2014-05-14 | Electrical Waste Recycling Group Ltd | Mercury vapour removal from a recycling plant |
| CN105344696B (en) * | 2015-08-11 | 2018-01-09 | 上海绿环机械有限公司 | A kind of useless fluorescent tube processing recovery system and technique |
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