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Method for leaching copper from single-layer waste circuit board

A waste circuit board and extraction technology, applied in the field of materials, can solve the problems of secondary pollution in the dusty environment, power consumption, etc.

Inactive Publication Date: 2016-04-13
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] All the technologies adopted in the above patents need to crush the waste circuit boards to recover copper, which not only consumes a lot of electric energy during the recycling process, but also causes secondary pollution to the environment due to the dust generated during the crushing process.

Method used

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  • Method for leaching copper from single-layer waste circuit board
  • Method for leaching copper from single-layer waste circuit board
  • Method for leaching copper from single-layer waste circuit board

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1) Select the single-layer waste circuit board of the cathode ray tube display as the test material, cut it into a 5*5cm square shape, put 200ml of NaOH aqueous solution with a mass percentage concentration of 1% in a 500ml small beaker, and place it in a 90°C water bath In the pot, soak the cut circuit board in the NaOH aqueous solution for 75min, then take it out and rinse it with clean water.

[0027] The test result is that the green oil film on the circuit board is completely removed, and the copper foil layer is exposed, such as figure 1 As shown, a is before degreening oil film, b is after degreening oil film.

[0028] 2) The waste circuit board obtained in step 1) after removing the green oil film was soaked in acidic copper chloride waste etching solution at room temperature, the solid-to-liquid ratio was 1g:5ml, and the soaking time was 40min, and then the remaining resin board was taken out.

[0029] The result of the test is that the exposed copper foil lay...

Embodiment 2

[0031] 1) Select the single-layer waste circuit board of the cathode ray tube display as the test material, cut it into a 5*5cm square shape, put 200ml of KOH aqueous solution with a mass percentage concentration of 1% in a 500ml small beaker, and place it in a 90°C water bath In the pot, soak the cut circuit board in the KOH aqueous solution for 75 minutes, then take it out and rinse it with clean water.

[0032] The test result is that the green oil film on the circuit board is completely removed, and the copper foil layer is exposed.

[0033] 2) The waste circuit board obtained in step 1) after removing the green oil film was soaked in alkaline copper chloride waste etching solution at room temperature, the solid-to-liquid ratio was 1g:36ml, and the soaking time was 32min, and then the remaining resin board was taken out.

[0034] The result of the test is that the exposed copper foil layer is completely dissolved by the waste etching solution, leaving only the resin board,...

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PUM

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Abstract

The invention discloses a method for leaching copper from a single-layer waste circuit board. The method comprises the following steps: (1) removing a green oil film on the surface of the waste circuit board with a diluted alkali solution, and then washing the waste circuit board with water; (2) immersing the waste circuit board treated by the step (1) in a waste etching solution for 20-60min, and thus completing the leaching of copper in the waste circuit board. Experiments prove that the method leaches the copper on the single-layer waste circuit board, utilizes the waste etching solution, and reduces the yield of waste liquid. The operation process is simple and feasible, the cost is low, and the method has great significance to environment protection.

Description

technical field [0001] The invention belongs to the field of materials, and in particular relates to a method for leaching copper from single-layer 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 process of recycling waste circuit boards, the method of "crushing-sorting" or "crushing-wet leaching" is generally used for recycling copper. The crushing process not only consumes a lot of electricity, but also produces dust that will cause environmental pollution. Therefore, it is an urgent problem to be solved in the process of recycling waste circuit boards to find a method for directly and efficiently leaching and recovering copper without crushing. [0003] There are as many as 20 processes in the production process of printed circuit boards (PCB), among which copper etching is the process that produces a large amount of waste l...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B15/00
CPCC22B7/007C22B7/008C22B15/0069C22B15/0078Y02P10/20
Inventor 李金惠于淼刘丽丽邓超王琎
Owner TSINGHUA UNIV