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A method for recycling waste circuit printed boards

A technology of recycling and circuit printing, which is applied in the field of waste recycling, can solve the problems of pollution and inability to solve the problems of debromination and detoxification of brominated flame retardants

Inactive Publication Date: 2015-12-09
FUJIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing waste PCBs treatment methods such as fire method, wet method, mechanical method and biological method cannot solve the problem of debromination and detoxification of brominated flame retardants
On the other hand, at present, a large amount of polyvinyl chloride (PVC) waste is mainly used for incineration for heat recovery, and there is a common serious pollution problem of chlorinated toxic organic substances such as dioxins emitted during the incineration process.

Method used

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  • A method for recycling waste circuit printed boards
  • A method for recycling waste circuit printed boards
  • A method for recycling waste circuit printed boards

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Such as figure 1 As shown, the main board and components of the waste printed circuit board are separated, the components are sorted and processed separately, and the main board is processed into pieces smaller than 1cm by a shearing machine. At the same time, cut the PVC waste into pieces of about 1cm. The cut waste circuit board fragments and PVC fragments were mixed at a mass ratio of 1:1 and then added to the hydrothermal oxidation reaction kettle with a solid-to-liquid ratio of 1:9 g / mL. Then, add 50ml of deionized water and 40ml of 30% hydrogen peroxide, seal the reactor immediately (you can also pass in oxygen for 1-5 minutes before sealing to replace hydrogen peroxide), heat, and the temperature rises to 350 degrees Start timing, and now the pressure in the container is controlled at 18MPa by a manual pressurization device, and the heating is stopped after 60 minutes of reaction. After the temperature dropped to room temperature, the reactor was opened, the re...

Embodiment 2

[0028] Such as figure 1 As shown, the main board and components of the waste printed circuit board are separated, the components are sorted and processed separately, and the main board is processed into pieces smaller than 1cm by a shearing machine. At the same time, cut the PVC waste into pieces of about 1cm. The cut waste circuit board fragments and PVC fragments were mixed at a mass ratio of 1:2 and then added to the hydrothermal oxidation reaction kettle with a solid-to-liquid ratio of 1:5g / mL. Then, add 30 ml of deionized water and 20 ml of 30% hydrogen peroxide, immediately seal the reactor (you can also pass in oxygen for 1-5 minutes before sealing to replace hydrogen peroxide), heat, and the temperature rises to 250 degrees Start timing, and now the pressure in the container is controlled at 12MPa by a manual pressurization device, and the heating is stopped after 60 minutes of reaction. After the temperature dropped to room temperature, the reactor was opened, the r...

Embodiment 3

[0030] Such as figure 1As shown, the main board and components of the waste printed circuit board are separated, the components are sorted and processed separately, and the main board is processed into pieces smaller than 1cm by a shearing machine. At the same time, cut the PVC waste into pieces of about 1cm. The cut waste circuit board fragments and PVC fragments were mixed at a mass ratio of 4:1 and then added to the hydrothermal oxidation reaction kettle with a solid-to-liquid ratio of 1:15g / mL. Then, add 90 ml of deionized water and 60 ml of 30% hydrogen peroxide, immediately seal the reactor (you can also pass in oxygen for 1-5 minutes before sealing to replace hydrogen peroxide), heat, and the temperature rises to 380 degrees Start timing, and now the pressure in the container is controlled at 22MPa by a manual pressurization device, and the heating is stopped after 180 minutes of reaction. After the temperature dropped to room temperature, the reactor was opened, the ...

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Abstract

The invention discloses a method for recycling a waste printed circuit board, which comprises the following steps: 1) separating a mainboard and components of the waste printed circuit board, classifying the components for additional treatment, and treating the mainboard by a shearing pulverizer into fragments of less than 1cm; 2) shearing PVC (polyvinyl chloride) waste into fragments of 1cm or so, mixing the waste circuit board fragments and PVC fragments in a mass ratio of 1:2-4:1, and putting into a hydrothermal oxidation reaction kettle; 3) adding deionized water and 30% hydrogen peroxide, sealing the reaction kettle, and controlling the reactant solid-to-liquid ratio at 1:5-1:15g / ml; 4) heating the reaction kettle, starting timekeeping when the temperature rises to 250-380 DEG C, reacting for 30-180 minutes while controlling the pressure in the reaction kettle at 12-22 MPa by a manual pressure device, and stopping heating; and 5) cooling to room temperature, opening the reaction kettle, carrying out solid-liquid separation, evaporating the liquid phase for concentration and crystallization, and recycling the CuCl2.2H2O crystal product.

Description

technical field [0001] The invention relates to the technical field of waste recycling and application, in particular, the invention relates to a method for recycling waste circuit printed boards. Background technique [0002] Printed circuit boards (PCBs) are widely used in computers, communication equipment, instruments, household appliances and other fields, and are the most critical basic components in electronic appliances. PCBs account for about 3% of electronic waste. With the acceleration of the upgrading of electronic and electrical products, the number of discarded PCBs is increasing year by year, and the number is very large. Scrap PCBs contain about 70% non-metal and 30% metal. The non-metal parts are mainly resins and brominated flame retardants (BFRs), some of which have been included in the new list of persistent organic pollutants (POPs). The metal component not only includes a large amount of copper with recycling value (about 20%), but also contains a ce...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B15/00
CPCY02P10/20
Inventor 修福荣齐莹莹
Owner FUJIAN UNIV OF TECH