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A method for removing green oil film in waste circuit boards

A waste circuit board and green oil film technology, which is applied in the field of removing green oil film in waste circuit boards, achieves the effect of low cost and simple and feasible operation process

Active Publication Date: 2018-06-22
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] All the technologies adopted in the above patents need to crush waste circuit boards to recover copper. At present, there are few studies on the direct recycling of waste circuit boards.

Method used

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  • A method for removing green oil film in waste circuit boards

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Select 0.5m 2 The single-layer waste circuit board of the cathode ray tube display is used as the test material, and 1L of NaOH aqueous solution with a mass percentage concentration of 4% is placed in a 2L beaker, heated to 100°C, and the selected waste circuit board is cut into small pieces and soaked in the In the prepared NaOH solution, the soaking time is 14min, then take it out and rinse it with clean water.

[0019] The test result is that the green oil film on all circuit boards is completely removed, and the copper foil layer is exposed, such as figure 1 As shown, a is before removal, and b is after removal.

Embodiment 2

[0021] Select 0.5m 2 The single-layer waste circuit board of cathode ray tube display is used as the test material, and 1L of KOH aqueous solution with a mass percent concentration of 4% is placed in a 2L beaker, heated to 100°C, and the selected waste circuit board is cut into small pieces and soaked in the In the prepared KOH solution, soak for 14 minutes, then take it out and rinse with clean water.

[0022] The test result is that the green oil film on all circuit boards is completely removed, and the copper foil layer is exposed.

Embodiment 3

[0024] Select 0.5m 2 The single-layer waste circuit board of the cathode ray tube display is used as the test material, and 1L of LiOH aqueous solution with a mass percent concentration of 4% is placed in a 2L beaker, heated to 100°C, and the selected waste circuit board is cut into small pieces and soaked in the In the prepared LiOH solution, the soaking time is 14min, then take it out and rinse it with clean water.

[0025] The test result is that the green oil film on all circuit boards is completely removed, and the copper foil layer is exposed.

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Abstract

The invention discloses a method for removing green oil films in waste circuit boards. The method comprises the following steps: removing a green oil film on the surface of a waste circuit board by using a diluted alkali solution, and washing with water. A film removing agent 1 m(3) can be used for removing green oil films of circuit boards 300-700 m(2). The method solves the problem that green oil films are difficultly removed from single-layer waste circuit boards in a whole board recycling process, is simple, convenient and feasible in operation process and low in cost, and has important significance on environmental protection.

Description

technical field [0001] The invention belongs to the technical field of electronic waste recycling, in particular to a method for removing green oil film in waste circuit boards. Background technique [0002] With the production and scrapping of electronic and electrical products, the amount of discarded circuit boards is increasing day by day. In the recycling process of single-layer waste circuit boards, due to its simple structure, the recycling value is relatively small. If the conventional method "crushing-sorting" or "crushing-wet leaching" is used for recycling, the crushing process will not only consume a lot of electricity and increase cost, and the dust generated will also pollute the environment. Therefore, direct whole board recycling can be considered, but because the copper surface of the circuit board is covered with a layer of green oil film, which hinders the leaching of copper during the whole board recycling process, so a method of efficiently removing the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23G1/20
CPCC23G1/20
Inventor 李金惠于淼刘丽丽董庆银王琎邓超
Owner TSINGHUA UNIV
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