Method for recovering tin and lead from waste printed circuit board and device for same

A technology for waste circuit boards and tin bars, applied in a method and the field of devices used therein, can solve the problems of low economic benefit, environmental pollution, large oil reagent consumption, etc., and achieve good economic benefit, avoid environmental pollution, and high purity Effect

Inactive Publication Date: 2012-01-25
HUAXING GROUP ENVIRONMENTAL PROTECTION IND DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the substrate material is mostly glass fiber-reinforced epoxy resin copper-clad laminate, which contains halogenated flame retardants. When heated, dangerous diphenylfuran and lead volatilization will cause immeasurable environmental pollution.
And the electronic components cannot be reused after processing
Another method is to heat the PCB board directly in heating oil. Alth...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A device for recovering tin and lead from waste circuit boards, including a deplating tank, a diaphragm pump and an electrolytic tank, in which a titanium mesh is used as an anode and a tin bar is used as a cathode, and the deplating tank passes through the A diaphragm pump communicates with the electrolytic cell.

[0036] A method for reclaiming tin and lead from waste circuit boards using the above-mentioned device, the specific steps are:

[0037] Step (1), get the methanesulfonic acid solution 100ml of mass fraction 65%, DI water 120ml, the nitric acid solution 10ml of mass fraction 60%, and the tensio-active agent of 14g dispersant, 7g corrosion inhibitor, 8g, then mix Evenly, make nitric acid-sulfonic acid type solution, add in described deplating tank as deplating solution;

[0038] In step (2), the waste circuit board is washed with water, then placed in the stripping solution, and stripped at 20°C for 10 minutes. In the plating solution, tin exists in the for...

Embodiment 2

[0042] It differs from Example 1 in that: a method for reclaiming tin and lead from waste circuit boards using the above-mentioned device, in step (1), take 100ml of methanesulfonic acid solution with a mass fraction of 65%, 120ml of DI water, and Fraction 60% nitric acid solution 70ml, and 16g dispersant, 8g corrosion inhibitor, 9g surfactant, then mix uniformly to make nitric acid-sulfonic acid type solution;

[0043] In step (2), deplating was carried out at 60° C. for 20 minutes, and the deplating solution was stirred by bubbling compressed air during the deplating process;

[0044] In step (4), the clear liquid entering the electroplating tank is electrolyzed at a temperature of 35° C., the current density during electrolysis is 20 A / dm 2 , the deposition rate is 5 μm / min, and the voltage U is 11 V.

Embodiment 3

[0046] It differs from Example 1 in that: a method for reclaiming tin and lead from waste circuit boards using the above-mentioned device, in step (1), take 100ml of methanesulfonic acid solution with a mass fraction of 65%, 120ml of DI water, and Fraction 60% nitric acid solution 40ml, and 15g dispersant, 7.5g corrosion inhibitor, 8.5g surfactant, then mix uniformly to make nitric acid-sulfonic acid type solution;

[0047] In step (2), deplating was carried out at 40° C. for 15 minutes, and the deplating solution was stirred by bubbling compressed air during the deplating process;

[0048] In step (4), the clear liquid entering the electroplating tank is electrolyzed at 22°C, the current density during electrolysis is 15A / dm2, the deposition rate is 4μm / min, and the voltage U is 6V.

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PUM

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Abstract

The invention discloses a device for recovering tin and lead from a waste printed circuit board. A deplating tank is connected with an electrolysis tank through a diaphragm pump; and in the electrolysis tank, a titanium mesh is used as an anode and a tin bar is used as a cathode. A method for recovering tin and lead from the waste printed circuit board by using the device comprises the following steps of: preparing 65 percent methylsulfonic acid solution; adding a corrosion inhibitor, a stabilizing agent, a surfactant and an oxidizer and uniformly mixing to form a deplating liquid; cleaning the waste printed circuit board with water, feeding the cleaned waste printed circuit board in the deplating liquid and deplating at the temperature of 20-60DEG C for 10-20 minutes; filtering lead existing in an elemental form from the deplating liquid; enabling residual clear solution to enter the interior of the electrolysis tank; and obtaining the metallic tin by electrolyzing at the temperature of 10-35DEG C. In the implementation, dangerous dibenzofuran, volatilization of lead and a large amount of washing wastewater can be avoided, thus environment friendliness is realized; the obtained lead and tin products have high purity and favorable economic benefit; and the electrolyzed solution can be recycled into the deplating tank to be used as the deplating liquid, thus the economy is realized and the pollution to the environment is avoided.

Description

technical field [0001] The invention relates to the technical field of processing and recycling waste electronic products, in particular to a method for recycling tin and lead from waste circuit boards and a device used therein. Background technique [0002] With the rapid development of printed circuit boards, printed circuit boards (PCBs) are an important part of electronic products. With the acceleration of information equipment replacement, the number of waste printed circuit boards is also increasing year by year. Due to the complex material composition and combination method, the dissociation particle size of the monomer is small, and it is not easy to achieve separation. The non-metallic components are mainly thermosetting plastics with special additives, which are difficult to dispose of. In the past, scrap circuit board recycling technology mainly focused on the recovery of precious metals. However, with the late 1970s, the technology of collecting precious metal...

Claims

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Application Information

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IPC IPC(8): C25C1/14C25C1/18C23G1/04
Inventor 张海青白庆田王建明
Owner HUAXING GROUP ENVIRONMENTAL PROTECTION IND DEV
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