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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
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI 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 and hydrogen bromide gas. These substances pollute the environment, corrode the processing equipment, and reduce the quality of the obtained fuel oil.

Method used

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  • 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
Comparison scheme
Effect test

Embodiment 1

[0030] Such as figure 1 As shown, a method for separating and recycling components of waste circuit boards with near-critical water mainly includes four processes: pretreatment, near-critical water treatment, extraction of resin matrix decomposition products, and extraction of copper foil and fiber woven cloth. Separation, 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 for further processing, and then cut the main board into cubes with a size of 1.0cm×1.0cm.

[0032](2) Near-critical water treatment: Add 1g of the cut waste circuit board main board and 5ml of water into the reactor according to the feed ratio of 1:5 (g / ml), and then add 0.02 g of hydrochloric acid (HCl) as a catalyst , seal the reaction kettle, turn on the power and start heating, the reaction temperature is 300°C, start timing after the temperature stabilizes, keep the re...

Embodiment 2

[0036] A method of using near-critical water to separate and recycle components of waste circuit boards, mainly comprising the following steps:

[0037] (1) Pretreatment: Disassemble and separate the main board and components of the waste circuit board, and classify the disassembled components for further processing, and then cut the main board into cubes with a size of 2cm×2cm.

[0038] (2) Near-critical water treatment: Add 1g of the cut waste circuit board main board and 15ml of water into the reactor according to the feed ratio of 1:15 (g / ml), and then add 0.02 g of sodium hydroxide (NaOH) , seal the reaction kettle, turn on the power and start heating, the reaction temperature is 320°C, start timing after the temperature stabilizes, and keep the reaction time for 150min. The pressure in the reactor is monitored by a pressure gauge connected to it, and the pressure in the reactor remains above 7.0MPa during the reaction.

[0039] (3) Extraction of resin matrix decompositi...

Embodiment 3

[0042] A method of using near-critical water to separate and recycle components of waste circuit boards, mainly comprising the following steps:

[0043] (1) Pretreatment: Disassemble and separate the main board and components of the waste circuit board, and classify the disassembled components for further processing, and then cut the main board into cubes with a size of 0.5cm×0.5cm.

[0044] (2) Near-critical water treatment: Add 1g of the cut waste circuit board main board and 10ml of water into the reactor according to the feed ratio of 1:10 (g / ml), and then add 0.02 g of sodium carbonate (Na 2 CO 3 ) as a catalyst, seal the reactor, turn on the power and start heating, the reaction temperature is 280°C, start timing after the temperature stabilizes, and keep the reaction time for 150min. 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 resin m...

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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.

Description

technical field [0001] The invention belongs to the field of recycling of electronic waste resources, and relates to a method for separating and recycling component materials of waste circuit boards. Background technique [0002] In recent years, with the rapid development of the electronic information industry, electronic products have been constantly updated, resulting in a large amount of electronic waste. At present, my country's electronic waste recycling is in a very urgent situation. Not only does it produce a large amount of electronic waste every year, but it also encounters the invasion of foreign electronic waste. my country has become the veritable world's largest "e-waste recycling station", which accommodates more than 70% of the world's e-waste every year. In order to reduce the cost of disposal of waste electrical appliances, some developed countries illegally transfer a large number of waste electrical appliances across the border to some southeastern coast...

Claims

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Application Information

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IPC IPC(8): B09B3/00B09B5/00
CPCY02W30/82
Inventor 刘宇艳康红军宫显云吴松全
Owner HARBIN INST OF TECH
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