Method for separating and recycling each component material in waste printed circuit boards by using near-critical water

A waste circuit board, near-critical water technology, applied in recycling technology, electronic waste recycling, solid waste removal, etc., can solve problems such as reducing fuel quality, corroding treatment equipment, polluting the environment, etc. Effect of carbonization rate

Active Publication Date: 2014-07-30
HARBIN INST OF TECH
10 Cites 10 Cited by

AI-Extracted Technical Summary

Problems solved by technology

However, during the pyrolysis process, the circuit board will generate more toxic and harmful substances such as masking smoke, elemental bromine an...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Abstract

The invention discloses a method for separating and recycling each component material in waste printed circuit boards by using near-critical water. According to the method, the near-critical water is taken as a reaction medium, and the waste printed circuit boards are separated and recycled by regulating and controlling the temperature and the reaction time to realize complete separation of a copper foil, glass fiber cloth and a resin substrate under the existence of different catalysts, wherein the recycled copper coil and glass fiber cloth can be further reused directly; the resin substrate exists in the form of decomposed oil; major components of the resin substrate are phenol and phenol derivatives which can be further purified into chemical raw materials for application. Thus, the method plays a role in promoting the recycling of the waste printed circuit boards, is an environmentally-friendly, easy-to-operate and efficient technology, and is very wide in application prospect.

Application Domain

Solid waste disposalElectronic waste recycling

Technology Topic

Copper foilPerylene derivatives +9

Image

  • Method for separating and recycling each component material in waste printed circuit boards by using near-critical water
  • Method for separating and recycling each component material in waste printed circuit boards by using near-critical water
  • Method for separating and recycling each component material in waste printed circuit boards by using near-critical water

Examples

  • Experimental program(3)

Example Embodiment

[0029] Example 1
[0030] Such as figure 1 As shown, a method for separating and recycling various component materials of waste circuit boards with near-critical water mainly includes four processes: pretreatment, near-critical water treatment, extraction of decomposition products of resin matrix, copper foil and fiber woven fabric The specific steps are as follows:
[0031] (1) Pretreatment: Disassemble and separate the main board and components of the waste circuit board, and classify the disassembled components before processing them separately, and then cut the main board into cubes with a size of 1.0cm×1.0cm.
[0032] (2) Near-critical water treatment: According to the feed ratio of 1:5 (g/ml), add 1g of the cut waste circuit board main board and 5ml of water to the reactor, and then add 0.02g of hydrochloric acid (HCl) as a catalyst , Seal the reactor, turn on the power to start heating, the reaction temperature is 300 ℃, after the temperature stabilizes, start timing, the reaction time is maintained for 120 minutes, and the pressure in the kettle is maintained above 4.5 MPa.
[0033] (3) Extraction of decomposition products of the resin matrix: After the near-critical water treatment, turn off the power, take out the reaction kettle and cool it to room temperature with tap water to transfer the reaction products, the aqueous decomposition liquid and solid phase products obtained, and then extract with ethyl acetate The aqueous phase decomposition liquid is mainly phenol and phenol derivatives (such as figure 2 As shown), the fiber fabric in the solid phase product obtained at the same time has obvious delamination, and the copper foil is easy to peel off (such as image 3 Shown)
[0034] (4) Recovery of copper foil and glass fiber cloth: the solid phase product (glass fiber cloth and copper foil) obtained in step (3) is soaked in acetone for 24 hours, then washed with distilled water 5 times, and placed in an oven at 100°C Dry for 3h in the middle to obtain the separation product of copper foil and glass fiber cloth (such as Figure 4-6 Shown).

Example Embodiment

[0035] Example 2
[0036] A method of using near-critical water to separate and recycle the components of waste circuit boards mainly includes the following steps:
[0037] (1) Pretreatment: Disassemble and separate the main board and components of the used circuit board, and classify the disassembled components before processing separately, and then cut the main board into cubes of 2cm×2cm.
[0038] (2) Near-critical water treatment: According to the feed ratio of 1:15 (g/ml), add 1g of the cut waste circuit board main board and 15ml of water to the reactor, and then add 0.02g of sodium hydroxide (NaOH) , The reaction kettle is sealed, the power is turned on to start heating, and the reaction temperature is 320°C. After the temperature stabilizes, start timing, and the reaction time is maintained for 150 minutes. The pressure in the reactor is monitored by a pressure gauge connected to it, and the pressure in the reactor remains above 7.0 MPa during the reaction.
[0039] (3) Extraction of decomposition products of the resin matrix: After the near-critical water treatment, turn off the power, take out the reaction kettle and cool it to room temperature with tap water to transfer the reaction products, the aqueous decomposition liquid and solid phase products obtained, and then extract with ethyl acetate The aqueous phase decomposition liquid is mainly phenol and phenol derivatives (such as figure 2 As shown), the fiber fabric in the solid phase product obtained at the same time has obvious delamination, and the copper foil is easy to peel off (such as image 3 Shown).
[0040] (4) Recovery of copper foil and glass fiber cloth: the solid phase product (glass fiber cloth and copper foil) obtained in step (3) is soaked in acetone for 24 hours, then washed with distilled water 5 times, and placed in a temperature of 100 ℃ Dry in an oven for 3 hours, and finally obtain the separation product of copper foil and glass fiber cloth (such as Figure 4 , 5 with Image 6 Shown).

Example Embodiment

[0041] Example 3
[0042] A method of using near-critical water to separate and recycle the components of waste circuit boards mainly includes the following steps:
[0043] (1) Pretreatment: Disassemble and separate the main board and components of the used circuit board, and classify the disassembled components before processing separately, and then cut the main board into cubes with a size of 0.5cm×0.5cm.
[0044] (2) Near-critical water treatment: According to the feed ratio of 1:10 (g/ml), add 1g of the cut waste circuit board main board and 10ml of water into the reactor, and then add 0.02 g of sodium carbonate (Na 2 CO 3 ) As a catalyst, the reactor is sealed, the power is turned on, and the heating is started. The reaction temperature is 280°C. After the temperature stabilizes, start timing and the reaction time is maintained for 150 minutes. The pressure in the reactor is monitored by a pressure gauge connected to it, and the pressure in the reactor remains above 5.0 MPa during the reaction.
[0045] (3) Extraction of decomposition products of the resin matrix: After the near-critical water treatment, turn off the power, take out the reaction kettle and cool it to room temperature with tap water to transfer the reaction products, the aqueous decomposition liquid and solid phase products obtained, and then extract with ethyl acetate The aqueous phase decomposition liquid is mainly phenol and phenol derivatives (such as figure 2 As shown), the fiber fabric in the solid phase product obtained at the same time has obvious delamination, and the copper foil is easy to peel off (such as image 3 Shown).
[0046] (4) Recovery of copper foil and glass fiber cloth: the solid phase product (glass fiber cloth and copper foil) obtained in step (3) is soaked in acetone for 24 hours, then washed with distilled water 5 times, and placed in a temperature of 100 ℃ Dry in an oven for 3 hours, and finally obtain the separation product of copper foil and glass fiber cloth (such as Figure 4-6 Shown).
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

no PUM

Description & Claims & Application Information

We can also present the details of the Description, Claims and Application information to help users get a comprehensive understanding of the technical details of the patent, such as background art, summary of invention, brief description of drawings, description of embodiments, and other original content. On the other hand, users can also determine the specific scope of protection of the technology through the list of claims; as well as understand the changes in the life cycle of the technology with the presentation of the patent timeline. Login to view more.
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Similar technology patents

Extensible regenerative brake control system

InactiveCN107499143AAvoid vehicle instabilityImprove recycling efficiencyElectrodynamic brake systemsFour-wheel driveEngineering
Owner:EASTONE AUTOMOTIVE TECH

System and method for resource recycling of vanadium-titanium-tungsten series denitration catalysts and water recycling use

PendingCN110117722AImprove recycling efficiencyReduce waste water generationElectrolysis componentsMultistage water/sewage treatmentAmmonium sulfateChemistry
Owner:HUANENG CLEAN ENERGY RES INST

Method for recycling ammonia nitrogen, phosphorus and volatile fatty acid in livestock-poultry excrement hydrolysate by two-stage bipolar membrane electrodialysis

ActiveCN107055712AAvoid pollution lossImprove recycling efficiencyWater contaminantsDispersed particle separationIonChemistry
Owner:HUANGSHAN TIANZHIDU ENVIRONMENTAL SCI & TECH DEV CO LTD

Cut tobacco recycling device for waste cigarettes

ActiveCN109330019AImprove recycling efficiencyCollege cut effectCigarette manufactureVortex flow apparatusScrapFine paper
Owner:郑州格兰高环境工程有限公司

Method and system for solving changes of exhaust gas recirculation (EGR) characteristic curves

ActiveCN102606320AReduce adverse effectsImprove recycling efficiencyEngine controllersMachines/enginesEngineeringExhaust gas recirculation
Owner:WEICHAI POWER CO LTD

Classification and recommendation of technical efficacy words

  • Improve recycling efficiency
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2023 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap