Device and method for recovering tin of circuit board

A circuit board and tin stripping technology, applied in the improvement of process efficiency, photography process, instruments, etc., can solve problems such as secondary pollution, achieve the effect of realizing recycling, compact and reasonable equipment layout, and preventing copper layer from being corroded

Pending Publication Date: 2018-07-20
昆山雅鑫化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the above-mentioned defects, the present invention provides a device for recovering tin from circuit boards. The device is applied in the process of removing tin from circuit boards and recovering tin, and can realize the recycling of tin-removing liquid without generating waste liquid and pollution. mud, thereby avoiding the occurrence of secondary pollution to the environment

Method used

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  • Device and method for recovering tin of circuit board

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Step 1: Configure the original tin stripping solution: the components and their parts by weight are: 100 parts of methanesulfonic acid, 100 parts of tin methanesulfonate, 5 parts of comprehensive agent, 5 parts of copper protecting agent, and 200 parts of deionized water , mix the above components evenly to get the original tin stripping solution;

[0037] Step 2: Add the original tin stripping solution into the tin stripping tank 11, immerse the cleaned circuit board in the tin stripping solution in the tin stripping tank, and control the temperature of the tin stripping solution at 20°C by using a cooling or heating system Strip tin for 1 hour, and circulate the tin stripping liquid in the tin stripping tank through the circulation pump to ensure the uniformity of the tin stripping liquid in the tin stripping tank;

[0038] Step 3: measure the concentration of tin in the tin stripping liquid in the tin stripping tank, and when the concentration of tin reaches 120g / L, ...

Embodiment 2

[0042] Embodiment 2: the difference with embodiment 1 is as follows:

[0043] Step 1: Configure the original tin stripping solution: each component and its parts by weight are: 135 parts of methanesulfonic acid, 130 parts of tin methanesulfonate, 20 parts of comprehensive agent, 10 parts of copper protecting agent, 300 parts of deionized water , mix the above components evenly to get the original tin stripping solution;

[0044] Step 2: Add the original tin stripping solution into the tin stripping tank 11, immerse the cleaned circuit board in the tin stripping solution in the tin stripping tank, and use a cooling or heating system to control the temperature of the tin stripping solution at 30°C Strip the tin for 2 hours, and circulate the tin stripping liquid in the tin stripping tank through the circulation pump to ensure the uniformity of the tin stripping liquid in the tin stripping tank.

Embodiment 3

[0045] Embodiment 3: the difference with embodiment 1 is as follows:

[0046] Step 1: Configure the original tin stripping solution: the components and their parts by weight are: 170 parts of methanesulfonic acid, 170 parts of tin methanesulfonate, 50 parts of comprehensive agent, 8 parts of copper protecting agent, and 350 parts of deionized water , mix the above components evenly to get the original tin stripping solution;

[0047] Step 2: Add the original tin stripping solution into the tin stripping tank 11, immerse the cleaned circuit board in the tin stripping solution in the tin stripping tank, and use a cooling or heating system to control the temperature of the tin stripping solution at 30°C Strip the tin for 4.5 hours, and circulate the tin stripping liquid in the tin stripping tank through the circulating pump to ensure the uniformity of the tin stripping liquid in the tin stripping tank.

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PUM

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Abstract

The invention relates to a device and method for recovering tin of a circuit board. The device comprises a first working groove and a second working groove. The first working groove comprises a tin removing groove and a liquid storage groove. The second working groove comprises a supplementing groove and an electrolysis groove. A negative electrode plate and a positive electrode plate are arrangedin the electrolysis groove. The tin removing groove pumps liquid into the liquid storage groove through a first liquid pump. The liquid storage groove pumps the liquid into the electrolysis groove through a second liquid pump. The electrolysis groove pumps the liquid into the supplementing groove through a third liquid pump. The supplementing groove pumps the liquid into the tin removing groove through a fourth liquid pump. The device is compact and reasonable in layout, continuous production is realized, operation is safer and more controllable, and the device has better use performance.

Description

technical field [0001] The invention relates to tin recovery, in particular to a device and method for recovering tin from circuit boards. Background technique [0002] The printed circuit board (PCB) industry is the foundation of modern electronics and information industries. With the development of high-tech industries, the demand for circuit boards is increasing year by year. There are as many as 20 processes in the PCB manufacturing process, in which a large amount of waste liquid including waste stripping liquid will be generated. At present, the tin stripping solution is mainly divided into three types: fluoride type, which is composed of hydrofluoric acid, fluoride salt (ammonium bifluoride), peroxide, etc.; nitric acid type tin stripping water, which is composed of nitric acid, ferric nitrate, corrosion inhibitor, surface Active agent, nitrogen oxide inhibitor, complexing agent, etc.; nitric acid-alkyl sulfonic acid type, the composition of this dosage form is simil...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B25/06C25C1/14
CPCC22B25/04C22B25/06C25C1/14Y02P10/20
Inventor 孙仕明
Owner 昆山雅鑫化工有限公司
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