CN112495999A - Method for dissociating and recycling metal and nonmetal materials in electronic waste - Google Patents
Method for dissociating and recycling metal and nonmetal materials in electronic waste Download PDFInfo
- Publication number
- CN112495999A CN112495999A CN202011296262.9A CN202011296262A CN112495999A CN 112495999 A CN112495999 A CN 112495999A CN 202011296262 A CN202011296262 A CN 202011296262A CN 112495999 A CN112495999 A CN 112495999A
- Authority
- CN
- China
- Prior art keywords
- product
- magnetic
- products
- metals
- dissociating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 229910052751 metal Inorganic materials 0.000 title claims abstract description 45
- 239000002184 metal Substances 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 33
- 239000000463 material Substances 0.000 title claims abstract description 14
- 229910052755 nonmetal Inorganic materials 0.000 title claims abstract description 13
- 238000004064 recycling Methods 0.000 title claims abstract description 6
- 239000010793 electronic waste Substances 0.000 title claims description 33
- 238000007885 magnetic separation Methods 0.000 claims abstract description 33
- 239000002245 particle Substances 0.000 claims abstract description 24
- 239000002699 waste material Substances 0.000 claims abstract description 18
- 238000011282 treatment Methods 0.000 claims abstract description 17
- 238000000926 separation method Methods 0.000 claims abstract description 9
- 238000012216 screening Methods 0.000 claims abstract description 6
- 235000010290 biphenyl Nutrition 0.000 claims abstract 3
- 150000004074 biphenyls Chemical class 0.000 claims abstract 3
- 239000007769 metal material Substances 0.000 claims description 27
- 150000002739 metals Chemical class 0.000 claims description 25
- 239000006148 magnetic separator Substances 0.000 claims description 19
- 239000002356 single layer Substances 0.000 claims description 19
- 238000001816 cooling Methods 0.000 claims description 18
- 239000010410 layer Substances 0.000 claims description 10
- 239000000843 powder Substances 0.000 claims description 10
- 231100000331 toxic Toxicity 0.000 claims description 9
- 230000002588 toxic effect Effects 0.000 claims description 9
- 238000007710 freezing Methods 0.000 claims description 8
- 230000008014 freezing Effects 0.000 claims description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 239000007789 gas Substances 0.000 claims description 2
- 238000003912 environmental pollution Methods 0.000 abstract description 5
- 238000005516 engineering process Methods 0.000 abstract description 3
- 229910052500 inorganic mineral Inorganic materials 0.000 abstract description 3
- 239000011707 mineral Substances 0.000 abstract description 3
- 239000010970 precious metal Substances 0.000 abstract description 2
- 238000000746 purification Methods 0.000 abstract description 2
- 231100000701 toxic element Toxicity 0.000 abstract 3
- 238000009837 dry grinding Methods 0.000 abstract 1
- 238000001035 drying Methods 0.000 abstract 1
- 239000010802 sludge Substances 0.000 abstract 1
- 238000004065 wastewater treatment Methods 0.000 abstract 1
- 231100000614 poison Toxicity 0.000 description 8
- 230000007096 poisonous effect Effects 0.000 description 8
- 239000011148 porous material Substances 0.000 description 6
- 238000011084 recovery Methods 0.000 description 6
- 239000003990 capacitor Substances 0.000 description 4
- 238000002386 leaching Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 229920000642 polymer Polymers 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000010494 dissociation reaction Methods 0.000 description 2
- 230000005593 dissociations Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 150000002843 nonmetals Chemical class 0.000 description 2
- 230000001698 pyrogenic effect Effects 0.000 description 2
- 238000003915 air pollution Methods 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229920000620 organic polymer Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000002341 toxic gas Substances 0.000 description 1
- 238000003911 water pollution Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B3/00—Destroying solid waste or transforming solid waste into something useful or harmless
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
- B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
- B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
- B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
- B02C23/14—Separating or sorting of material, associated with crushing or disintegrating with more than one separator
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03C1/00—Magnetic separation
- B03C1/02—Magnetic separation acting directly on the substance being separated
- B03C1/30—Combinations with other devices, not otherwise provided for
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
- B09B5/00—Operations not covered by a single other subclass or by a single other group in this subclass
-
- 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]
Landscapes
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Food Science & Technology (AREA)
- Processing Of Solid Wastes (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a sorting and recycling process of metal resources and nonmetal resources in a waste circuit board, and belongs to the technical field of comprehensive recycling of secondary resources. Firstly, disassembling toxic elements containing polybrominated biphenyls on a waste circuit board, coarsely crushing the toxic elements by using a crusher after disassembly, screening the toxic elements by using a vibrating screen, performing strong magnetic separation on products under the coarsely crushed screen, performing precooling and fine crushing on nonmagnetic products, performing weak magnetic separation on the finely crushed qualified products, performing dry grinding and classification on nonmagnetic minerals obtained by the weak magnetic separation, performing air separation operation on products with different particle sizes, and recovering metal components and nonmetal material components. The method and the equipment used by the invention are simple, the metal components and the nonmetal components are separated by adopting various sorting technologies, the problems of wastewater treatment, sludge treatment and the like are avoided by adopting a dry process for sorting, the environmental pollution is less, the resource utilization of the effective components of the waste circuit board is realized, and the subsequent purification treatment of precious metals is facilitated.
Description
Technical Field
The invention belongs to the technical field of comprehensive recovery of secondary resources, and particularly relates to a sorting and recovering process of metal resources and nonmetal resources in electronic wastes.
Background
In recent years, the electronic industry in China is developed rapidly, the period of updating and upgrading electronic products is shortened continuously with the gradual change of technological progress, many electronic products are eliminated, a part of electronic products are discarded due to the service life, and the electronic wastes become one of the wastes with the fastest growth rate in our living cities and are about 3-4 times of the wastes in common cities. However, the electronic waste has high-grade metals such as iron, copper, aluminum and the like, precious metal materials and useful non-metallic substances, and if the resources are reasonably recycled, the environmental pollution is reduced, certain economic benefit is created, and the method has great significance for solving the contradiction between supply and demand of mineral resources in China.
At present, resource utilization of electronic wastes mainly comprises mechanical treatment, pyrogenic treatment, wet treatment and the like, a large amount of plastic fiber substances of the electronic wastes have high toughness and are difficult to reach a target fine particle level through common mechanical crushing, subsequent metal purification is difficult due to incomplete dissociation, a large amount of dust pollution is generated by the pyrogenic treatment, air pollution and water pollution of different degrees are caused by the wet method, a large amount of chemical agents are consumed, and secondary pollution is caused by the use of strong acid and strong alkaline agents. Chinese patent with patent publication No. CN102172597B discloses a method for recovering the full value of a waste circuit board, which comprises the steps of crushing the waste circuit board to 5mm, adopting a shaking table to carry out vibration separation, separating waste circuit board particles with the particle size range of-5 to +2mm, wherein the waste circuit board particles are not completely crushed, and the range of the fed particles is wider, so that the effect of vibration separation by the shaking table is not ideal for separating narrow-particle-size materials. Chinese patent publication No. CN201710845467X discloses a method for efficiently leaching copper in waste circuit boards, toxic components are not disassembled, crushing treatment is performed, a large amount of heat and toxic gas are generated to pollute the atmosphere, wet-method strong acid and alkaline substance leaching is adopted, leaching cost is high, effect is poor, environmental pollution is serious, in order to recover metal, organic polymers are completely destroyed, no high polymer containing no metal is enriched, not only the environment is polluted, but also the problems of resource waste and the like are caused.
In conclusion, in the recovery process of metal resources in electronic wastes, the existing method has defects and problems of different degrees in the aspects of crushing efficiency, crushing mode, pollution degree to the environment, cost and the like, the simple wet leaching and the complex recovery process can not avoid the waste of the environment and resources, the target dissociation degree can be obtained through the processing procedures of grinding, freezing, pretreatment and regrinding, the procedures are simple, the environmental pollution and the resource waste are reduced, the metal substances and the metal-free high polymer are effectively pre-enriched, the obtained metal-free high polymer can be recycled, the metal-containing substances can be reprocessed, the cost and the environmental pollution are reduced, and the resources are recycled.
Disclosure of Invention
The invention aims to provide a method for dissociating and recovering metals and non-metal materials in electronic waste, which has the advantages of simple operation, no pollution, low cost and high separation degree of metals and non-metals in the electronic waste.
The invention relates to a method for dissociating and recovering metals and non-metallic materials in electronic waste, which comprises the following steps: (1) and disassembling toxic and damaged capacitors and other components on the waste circuit board.
(2) Get rid of the circuit board of the poisonous damaged poisonous original paper and give into the breaker and carry out coarse crushing, coarse crushing product sieves with square sieve mesh shale shaker, and the oversize product of square sieve mesh shale shaker returns the breaker and breaks again.
(3) Undersize products of the square sieve mesh vibrating screen are fed into a drum-type strong magnetic separator for strong magnetic separation, and magnetic products of the strong magnetic separation are metal materials 1.
(4) And feeding the strongly-magnetic non-magnetic product into a pre-cooling chamber for liquid ammonia freezing treatment, feeding the cold-treated non-magnetic product into a roller crusher for fine crushing, controlling the particle size of the fine crushed product by using a single-layer negative pressure sieve, and returning the product on the single-layer negative pressure sieve to the roller crusher for crushing.
(5) And feeding the undersize product of the single-layer negative pressure sieve into a drum magnetic separator for low-intensity magnetic separation, wherein the magnetic product subjected to low-intensity magnetic separation is a metal material 2.
(6) Carrying out dry-type ore grinding on the non-magnetic product subjected to low-intensity magnetic separation, feeding the product subjected to ore grinding into a three-layer negative-pressure fine powder sieve for screening, wherein the product subjected to ore grinding is divided into four grain fractions by the three-layer negative-pressure fine powder sieve, and the grain sizes of the four grain fraction products are sequentially from coarse to fine: +0.5mm, -0.5+0.25mm, -0.25+0.1mm, -0.1mm, and returning the product with the particle size fraction of +0.5mm to the mill for regrinding.
(7) And (3) feeding products with three size fractions of-0.5 +0.25mm, -0.25+0.1mm and-0.1 mm into a winnowing operation, and winnowing the products with the three size fractions to respectively obtain heavy materials containing metals and light materials without metals.
The invention relates to a method for dissociating and recovering metals and non-metallic materials in electronic waste, wherein the electronic waste is selected from printed circuit boards containing metal elements of electric appliances and electronic products.
The invention relates to a method for dissociating and recovering metals and non-metallic materials in electronic waste, which is characterized in that a crusher is a jaw crusher, the size of a sieve pore of a square sieve pore vibrating screen is 30-50 mm, and an oversize product of the square sieve pore vibrating screen is repeatedly crushed to ensure the size fraction of the material entering a drum-type magnetic separator.
The invention relates to a method for dissociating and recovering metals and non-metallic materials in electronic waste, wherein the magnetic field intensity of a drum-type strong magnetic separator is controlled to be 12500 Oe-15000 Oe.
The invention relates to a method for dissociating and recovering metals and non-metallic materials in electronic waste, wherein a strongly magnetic non-magnetic product is fed into a pre-cooling chamber for liquid ammonia freezing treatment, and an intelligent temperature control system is arranged in the pre-cooling chamber, so that the electromagnetic valve is controlled to control the amount of liquid nitrogen entering the pre-cooling chamber, the cooling temperature is-60 ℃ to-120 ℃, and the cooling time is 4min to 8min, so that the non-magnetic product can obtain better brittleness.
The invention relates to a method for dissociating and recovering metals and non-metallic materials in electronic waste, wherein a non-magnetic separation product subjected to cold treatment is fed into a roller crusher for fine crushing, the particle size of the fine crushing product is controlled by using a single-layer negative pressure sieve, and the sieve mesh size of the single-layer negative pressure sieve is 5-10 mm.
The invention relates to a method for dissociating and recovering metals and non-metallic materials in electronic waste, wherein a product under a single-layer negative pressure sieve is fed into a drum magnetic separator for low-intensity magnetic separation, and the magnetic field intensity of the drum magnetic separator is 1500 Oe-3000 Oe.
The invention relates to a method for dissociating and recovering metals and non-metallic materials in electronic waste, wherein the optimal air flow speed of a-0.5 +0.25mm size fraction product in the selecting operation is 1.25 m/s; -0.25+0.1mm size fraction product selected for optimum airflow rate of 0.55 m/s; the optimum gas flow rate for a 0.1mm particle size product is 0.26 m/s.
Drawings
Fig. 1 is a flow chart of a mineral sorting and recycling process of metal resources in electronic waste according to the present invention.
Detailed Description
For the convenience of understanding, the invention will be explained and illustrated in detail with reference to the accompanying drawings and examples, but the scope of the invention is not limited by the following examples.
Example 1
The electronic waste is taken from a discarded circuit board in a scrapped computer of an electronic technology company in Guangzhou, the steps of the method for dissociating and recovering the metal and the nonmetal materials in the electronic waste are shown in figure 1, and the operation steps are as follows:
(1) and disassembling toxic and damaged capacitors and other components on the waste circuit board.
(2) Get rid of the circuit board of the poisonous damaged poisonous original paper and give into the breaker and carry out coarse crushing, coarse crushing product is sieved at 30mm ~50mm with square sieve mesh shale shaker sieve mesh size control, and the product on the sieve of square sieve mesh shale shaker returns the breaker and breaks again.
(3) Undersize products of the square screen hole vibrating screen are fed into a drum type strong magnetic separator for strong magnetic separation, and the magnetic field intensity is adjusted to 13500 Oe.
(4) And feeding the non-magnetic separation product subjected to the strong magnetic separation into a pre-cooling chamber for liquid ammonia freezing treatment, wherein the cooling temperature is-60 ℃, the cooling time is 4min, feeding the non-magnetic separation product subjected to the cold treatment into a roller type crusher for fine crushing, using a single-layer negative pressure sieve for the fine crushing product, enabling the size of a sieve pore to be 5-10 mm, and returning the product on the single-layer negative pressure sieve to the roller type crusher for crushing.
(5) And feeding the product under the screen of the single-layer negative pressure screen into a drum magnetic separator for low-intensity magnetic separation, and adjusting the magnetic field intensity of the drum magnetic separator to be 1500 Oe.
(6) Carrying out dry-type ore grinding on the non-magnetic product subjected to low-intensity magnetic separation, feeding the product subjected to ore grinding into a three-layer negative-pressure fine powder sieve for screening, wherein the product subjected to ore grinding is divided into four grain fractions by the three-layer negative-pressure fine powder sieve, and the grain sizes of the four grain fraction products are sequentially from coarse to fine: +0.5mm, -0.5+0.25mm, -0.25+0.1mm, -0.1mm, and returning the product with the particle size fraction of +0.5mm to the mill for regrinding.
(7) And (3) feeding three size fractions of-0.5 +0.25mm, -0.25+0.1mm and-0.1 mm into winnowing operation, selecting products with-0.5 +0.05mm particle size according to the air flow velocity of 1.25m/s, selecting products with-0.25 +0.05mm particle size according to the air flow velocity of 0.55m/s, selecting products with-0.1 +0.05mm particle size according to the air flow velocity of 0.26m/s, and obtaining the recovery rate of metal by sorting to 92.23%.
Example 2
The electronic waste is the same as the embodiment 1, the steps of the method for efficiently dissociating and recovering metals and non-metals in the electronic waste are shown in fig. 1, and the operation steps are as follows:
(1) and disassembling toxic and damaged capacitors and other components on the waste circuit board.
(2) Get rid of the circuit board of the poisonous damaged poisonous original paper and give into the breaker and carry out coarse crushing, coarse crushing product is sieved at 30mm ~50mm with square sieve mesh shale shaker sieve mesh size control, and the product on the sieve of square sieve mesh shale shaker returns the breaker and breaks again.
(3) Undersize products of the vibrating screen with the square screen holes are fed into a drum-type strong magnetic separator for strong magnetic separation, and the intensity of the magnetic field is adjusted to 12500 Oe.
(4) And feeding the non-magnetic separation product subjected to the strong magnetic separation into a pre-cooling chamber for liquid ammonia freezing treatment, wherein the cooling temperature is-100 ℃, the cooling time is 6min, feeding the non-magnetic separation product subjected to the cold treatment into a roller type crusher for fine crushing, using a single-layer negative pressure sieve for the fine crushing product, enabling the size of a sieve pore to be 5-10 mm, and returning the product on the single-layer negative pressure sieve to the roller type crusher for crushing.
(5) And feeding the product under the screen of the single-layer negative pressure screen into a drum magnetic separator for low-intensity magnetic separation, and adjusting the magnetic field intensity of the drum magnetic separator to 2000 Oe.
(6) Carrying out dry-type ore grinding on the non-magnetic product subjected to low-intensity magnetic separation, feeding the product subjected to ore grinding into a three-layer negative-pressure fine powder sieve for screening, wherein the product subjected to ore grinding is divided into four grain fractions by the three-layer negative-pressure fine powder sieve, and the grain sizes of the four grain fraction products are sequentially from coarse to fine: +0.5mm, -0.5+0.05mm, -0.25+0.1mm, -0.1mm, and returning the product with the particle size fraction of +0.5mm to the mill for regrinding.
(7) The air separation operation is carried out on three-size-fraction products of-0.5 +0.05mm, -0.25+0.1mm and-0.1 mm according to the air flow velocity of 1.25m/s for the products with-0.5 +0.05mm particle size, the air flow velocity of 0.55m/s for the products with-0.25 +0.05mm particle size and the air flow velocity of 0.26m/s for the products with-0.1 +0.05mm particle size, and the recovery rate of the separated metal reaches 93.26%.
Example 3
The electronic waste is obtained from Shenzhen electronic technology company, the steps of the method for dissociating and recovering the metal and nonmetal materials in the electronic waste are shown in figure 1, and the operation steps are as follows:
(1) and disassembling toxic and damaged capacitors and other components on the waste circuit board.
(2) Get rid of the circuit board of the poisonous damaged poisonous original paper and give into the breaker and carry out coarse crushing, coarse crushing product is sieved at 30mm ~50mm with square sieve mesh shale shaker sieve mesh size control, and the product on the sieve of square sieve mesh shale shaker returns the breaker and breaks again.
(3) Undersize products of the vibrating screen with the square screen holes are fed into a drum type strong magnetic separator for strong magnetic separation, and the magnetic field intensity is adjusted to 14000 Oe.
(4) And feeding the strongly magnetic non-magnetic separation product into a pre-cooling chamber for liquid nitrogen freezing treatment, wherein the cooling temperature is-110 ℃, the cooling time is 4min, feeding the cold-treated non-magnetic separation product into a roller crusher for fine crushing, using a single-layer negative pressure sieve for the fine crushing product, wherein the size of a sieve pore is 5-10 mm, and returning the product on the single-layer negative pressure sieve to the roller crusher for crushing.
(5) And feeding the product under the single-layer negative pressure sieve into a drum magnetic separator for low-intensity magnetic separation, and adjusting the magnetic field intensity of the drum magnetic separator to 2500 Oe.
(6) Carrying out dry-type ore grinding on the non-magnetic product subjected to low-intensity magnetic separation, feeding the product subjected to ore grinding into a three-layer negative-pressure fine powder sieve for screening, wherein the product subjected to ore grinding is divided into four grain fractions by the three-layer negative-pressure fine powder sieve, and the grain sizes of the four grain fraction products are sequentially from coarse to fine: +0.5mm, -0.5+0.25mm, -0.25+0.1mm, -0.1mm, and returning the product with the particle size fraction of +0.5mm to the mill for regrinding.
(7) The air separation operation is carried out on three-size-fraction products of-0.5 +0.25mm, -0.25+0.1mm and-0.1 mm according to the air flow velocity of 1.25m/s selected for the products with-0.5 +0.25mm particle size, the air flow velocity of 0.55m/s selected for the products with-0.25 +0.1mm particle size, and the recovery rate of the separated metal reaches 92.73 percent according to the air flow velocity of 0.26m/s selected for the products with-0.1 mm particle size.
The above embodiments are merely illustrative of the present invention and are not intended to limit the present invention. It will be understood by those skilled in the art that various simple modifications and equivalents may be made thereto without departing from the scope of the invention defined in the claims.
Claims (7)
1. A method for dissociating and recovering metals and non-metallic materials in electronic waste is characterized by comprising the following steps:
(1) disassembling some toxic damaged components on the waste circuit board;
(2) feeding the circuit board without the toxic damaged components into a crusher for coarse crushing, screening the coarse crushed product by using a square sieve mesh vibrating screen, and returning the oversize product of the square sieve mesh vibrating screen to the crusher for crushing again;
(3) feeding undersize products of the square screen mesh vibrating screen into a drum-type strong magnetic separator for strong magnetic separation, wherein the magnetic products subjected to strong magnetic separation are first metal materials;
(4) feeding the strongly-magnetic non-magnetic product into a pre-cooling chamber for liquid nitrogen freezing treatment, feeding the frozen non-magnetic product into a roller crusher for fine crushing, controlling the particle size of the fine crushed product by using a single-layer negative pressure sieve, and returning the product on the single-layer negative pressure sieve to the roller crusher for crushing;
(5) feeding the undersize product of the single-layer negative pressure sieve into a drum type magnetic separator for low-intensity magnetic separation, wherein the magnetic product subjected to low-intensity magnetic separation is a second metal material;
(6) the non-magnetic product subjected to low-intensity magnetic separation is fed into a grinding machine to be ground in a dry mode, the product subjected to grinding is fed into a three-layer negative-pressure fine powder sieve to be sieved, the product subjected to grinding is divided into four grain grades by the three-layer negative-pressure fine powder sieve, and the grain sizes of the four grain grade products are sequentially from coarse to fine: +0.5mm, -0.5+0.25mm, -0.25+0.1mm, -0.1mm, and returning the product with the particle size fraction of +0.5mm to the mill for regrinding;
(7) and (3) feeding products with three size fractions of-0.5 +0.25mm, -0.25+0.1mm and-0.1 mm into a winnowing operation, and winnowing the products with the three size fractions to respectively obtain heavy materials containing metals and light materials without metals.
2. The method for dissociating and recycling metals and non-metallic materials from electronic waste according to claim 1, wherein the toxic damaged components in the step (1) comprise toxic and damaged components such as polybrominated biphenyls and polybrominated biphenyls.
3. The method for dissociating and recovering metals and non-metallic materials in electronic waste according to claim 1, wherein the crusher in the step (2) is a jaw crusher, and the size of the square mesh vibrating screen is 30mm to 50 mm.
4. The method for dissociating and recovering metals and non-metallic materials in electronic waste according to claim 1, wherein the magnetic field intensity of the drum-type strong magnetic separator in the step (3) is controlled to be 12500 Oe-15000 Oe.
5. The method for dissociating and recovering metals and non-metallic materials in electronic waste according to claim 1, wherein the nonmagnetic product subjected to the strong magnetic separation in the step (4) is subjected to liquid ammonia freezing treatment in a precooling chamber, the cooling temperature is-60 ℃ to-120 ℃, the cooling time is 4min to 8min, and the size of a screen hole of the single-layer negative pressure screen is 5mm to 10 mm.
6. The method for dissociating and recovering metals and non-metallic materials in electronic waste according to claim 1, wherein the magnetic field strength of the drum magnetic separator in the step (5) is 1500 Oe-3000 Oe.
7. The method for separating and recovering metals and non-metallic materials from electronic waste as claimed in claim 1, wherein the optimum air velocity for the-0.5 +0.25mm fraction product in the air separation operation in step (7) is 1.25m/s, the heavy product after air separation is the third metallic material, and the light material is the first non-metallic material without metals; -0.25+0.1mm size fraction product selected for optimum air velocity of 0.55m/s, the heavy product after winnowing being a fourth metal material and the light material being a second non-metal material free of metals; the optimum gas flow rate for the product with a particle size of-0.1 mm is 0.26m/s, the heavy product after air separation is the fifth metal material, and the light product is the third non-metal material without metal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011296262.9A CN112495999B (en) | 2020-11-18 | 2020-11-18 | Method for dissociating and recovering metal and nonmetal materials in electronic waste |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011296262.9A CN112495999B (en) | 2020-11-18 | 2020-11-18 | Method for dissociating and recovering metal and nonmetal materials in electronic waste |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112495999A true CN112495999A (en) | 2021-03-16 |
| CN112495999B CN112495999B (en) | 2023-04-18 |
Family
ID=74956970
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011296262.9A Expired - Fee Related CN112495999B (en) | 2020-11-18 | 2020-11-18 | Method for dissociating and recovering metal and nonmetal materials in electronic waste |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112495999B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI844926B (en) * | 2022-08-26 | 2024-06-11 | 李連資源科技股份有限公司 | Regeneration treatment method of waste shell-mold and system thereof |
Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1238244A (en) * | 1999-03-10 | 1999-12-15 | 沈志刚 | Process for breaking, separating and recovering waste printed circuit board and apparatus thereof |
| KR20010070721A (en) * | 2001-06-01 | 2001-07-27 | 정인 | Manufacturing method of crashed matter for construction materials using waste PCB |
| CN1611309A (en) * | 2003-10-31 | 2005-05-04 | 中国矿业大学北京校区 | Method for recovering valuable resource from waste printed circuit board |
| CN101642765A (en) * | 2009-09-04 | 2010-02-10 | 北京航空航天大学 | Recycling method of discarded circuit board |
| CN102671916A (en) * | 2012-05-21 | 2012-09-19 | 宁波天地回珑再生资源科技有限公司 | Recycling processing technology for waste circuit board |
| CN102962244A (en) * | 2012-12-07 | 2013-03-13 | 桑德环境资源股份有限公司 | Waste PCB (printed circuit board) crushing and sorting system |
| CN104096704A (en) * | 2013-04-03 | 2014-10-15 | 中国科学院生态环境研究中心 | Enrichment method for palladium in waste circuit board |
| JP2018167208A (en) * | 2017-03-30 | 2018-11-01 | Ｊｘ金属株式会社 | Treatment method for treatment object material |
| CN109013046A (en) * | 2018-08-02 | 2018-12-18 | 广东省资源综合利用研究所 | A method of recycling spodumene from the solid waste of magnetism containing spodumene |
| CN109865588A (en) * | 2019-04-12 | 2019-06-11 | 中冶北方（大连）工程技术有限公司 | A kind of transition zone mixing iron ore beneficiation technique |
| WO2019114199A1 (en) * | 2017-12-14 | 2019-06-20 | 北京工业大学 | Caloric synergistic environment-friendly reclamation method for waste integrated circuit board |
| CN110898957A (en) * | 2019-11-13 | 2020-03-24 | 鞍钢集团矿业有限公司 | Particle size grading pre-selection tailing discarding process for extremely lean hematite |
| JP2020138141A (en) * | 2019-02-28 | 2020-09-03 | 三菱マテリアル株式会社 | Processing method of waste electronic substrate |
-
2020
- 2020-11-18 CN CN202011296262.9A patent/CN112495999B/en not_active Expired - Fee Related
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1238244A (en) * | 1999-03-10 | 1999-12-15 | 沈志刚 | Process for breaking, separating and recovering waste printed circuit board and apparatus thereof |
| KR20010070721A (en) * | 2001-06-01 | 2001-07-27 | 정인 | Manufacturing method of crashed matter for construction materials using waste PCB |
| CN1611309A (en) * | 2003-10-31 | 2005-05-04 | 中国矿业大学北京校区 | Method for recovering valuable resource from waste printed circuit board |
| CN101642765A (en) * | 2009-09-04 | 2010-02-10 | 北京航空航天大学 | Recycling method of discarded circuit board |
| CN102671916A (en) * | 2012-05-21 | 2012-09-19 | 宁波天地回珑再生资源科技有限公司 | Recycling processing technology for waste circuit board |
| CN102962244A (en) * | 2012-12-07 | 2013-03-13 | 桑德环境资源股份有限公司 | Waste PCB (printed circuit board) crushing and sorting system |
| CN104096704A (en) * | 2013-04-03 | 2014-10-15 | 中国科学院生态环境研究中心 | Enrichment method for palladium in waste circuit board |
| JP2018167208A (en) * | 2017-03-30 | 2018-11-01 | Ｊｘ金属株式会社 | Treatment method for treatment object material |
| WO2019114199A1 (en) * | 2017-12-14 | 2019-06-20 | 北京工业大学 | Caloric synergistic environment-friendly reclamation method for waste integrated circuit board |
| CN109013046A (en) * | 2018-08-02 | 2018-12-18 | 广东省资源综合利用研究所 | A method of recycling spodumene from the solid waste of magnetism containing spodumene |
| JP2020138141A (en) * | 2019-02-28 | 2020-09-03 | 三菱マテリアル株式会社 | Processing method of waste electronic substrate |
| CN109865588A (en) * | 2019-04-12 | 2019-06-11 | 中冶北方（大连）工程技术有限公司 | A kind of transition zone mixing iron ore beneficiation technique |
| CN110898957A (en) * | 2019-11-13 | 2020-03-24 | 鞍钢集团矿业有限公司 | Particle size grading pre-selection tailing discarding process for extremely lean hematite |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI844926B (en) * | 2022-08-26 | 2024-06-11 | 李連資源科技股份有限公司 | Regeneration treatment method of waste shell-mold and system thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112495999B (en) | 2023-04-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Dauce et al. | Characterisation and magnetic concentration of an iron ore tailings | |
| Burat et al. | Physical separation route for printed circuit boards | |
| Wilson et al. | The application of mineral processing techniques for the recovery of metal from post-consumer wastes | |
| Zhang et al. | Intelligent liberation and classification of electronic scrap | |
| Yang et al. | Recycling organics from non-metallic fraction of waste printed circuit boards by a novel conical surface triboelectric separator | |
| CN102671916B (en) | Recycling processing technology for waste circuit board | |
| Wang et al. | Morphology, mineralogy and separation characteristics of nonmetallic fractions from waste printed circuit boards | |
| US11130141B2 (en) | System and method for recovering glass and metal from a mixed waste stream | |
| Zhang et al. | New technology for recovering residual metals from nonmetallic fractions of waste printed circuit boards | |
| CN104399578B (en) | Pre-selection method for low-grade hematite-containing waste rock | |
| CN108325738B (en) | Step recovery method for metal aluminum in aluminum ash | |
| CN1247326C (en) | Dry physical recovery process for recovering valuable components from waste electronic board card | |
| Habib et al. | Recovering metallic fractions from waste electrical and electronic equipment by a novel vibration system | |
| Bachér et al. | Mechanical pre-treatment of mobile phones and its effect on the Printed Circuit Assemblies (PCAs) | |
| CN102699008A (en) | Mechanically physical treatment method used for various electronic wastes | |
| CN101455991A (en) | New technique for recovering non-ferrous metal from waste and old printing circuit board | |
| CN101704012A (en) | Method for recovering and separating PCB by dry method | |
| Zhu et al. | Effect of dissociation size on flotation behavior of waste printed circuit boards | |
| CN112495999B (en) | Method for dissociating and recovering metal and nonmetal materials in electronic waste | |
| JP2001046975A (en) | Treatment of composite waste and treating device | |
| CN101585042B (en) | Aqueous medium physical recovering art for valuable components in waste circuit board and device thereof | |
| CN103464450A (en) | Recovery processing method for waste refrigerator | |
| KR101380806B1 (en) | Method for processing sludge | |
| CN115156243A (en) | Recovery process of anode and cathode materials of waste battery | |
| CN113941441A (en) | Wet-type strong magnetic preselection method for low-grade chromite |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20230418 |