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
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[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 re...
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[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) Extra...
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 du...
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