Method for wet separation of electronic components in discarded printed circuit board and tin stripping agent

A technology for discarding circuit boards and electronic components, applied in the direction of improving process efficiency, etc., can solve the problems of weak oxidation of tin stripper, slow tin stripping speed, damage to components, etc., to achieve improved dissolution rate, low corrosion, Dissolution-promoting effect

Active Publication Date: 2016-06-01
HUNAN JIANG YE MECHANICAL & ELECTRICAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of tin stripping solution of nitric acid system to separate electronic components of discarded circuit boards is easy to cause damage to components, and the composition is compl

Method used

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  • Method for wet separation of electronic components in discarded printed circuit board and tin stripping agent
  • Method for wet separation of electronic components in discarded printed circuit board and tin stripping agent

Examples

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Effect test

Embodiment 1

[0035] A method for wet separation of electronic components in waste circuit boards of the present invention and an embodiment of the tin stripper, comprising the following steps:

[0036] 1) Prepare reagents: Dissolve sodium hydroxide and sodium citrate in water to form a solution I with a concentration of sodium hydroxide of 200 g / L and a concentration of sodium citrate of 20 g / L. The volume of this solution I is 500 ml.

[0037] 2) Separation of tin stripping: Clean and dry the 6cm×6cm discarded desktop computer circuit boards with electronic components, put them into 500ml solution I, and put the discarded Add tert-butyl hydroperoxide to the solution I of the circuit board and fully stir it. At the same time, use an ultrasonic wave to vibrate the solution, filter it after 30 minutes of treatment, separate the electronic components from the circuit board, and count the dissolution rate of the solder, the separation rate of the components and components. Failure rate. Its s...

Embodiment 2

[0039] A method for wet separation of electronic components in waste circuit boards of the present invention and an embodiment of the tin stripper, comprising the following steps:

[0040] 1) Prepare reagents: Dissolve sodium hydroxide and sodium citrate in water to form a solution I with a concentration of sodium hydroxide of 250 g / L and a concentration of potassium citrate of 30 g / L. The volume of this solution I is 500 ml.

[0041] 2) Separation of tin stripping: Clean and dry the 6cm×6cm discarded desktop computer circuit boards with electronic components, put them into 500ml solution I, and put the discarded circuit boards at a flow rate of 4mL / min at 50°C. Add hydrogen peroxide to the solution I of the board and stir it fully. At the same time, use ultrasonic vibration to oscillate the solution, filter it after 30 minutes of treatment, separate the electronic components from the circuit board, and count the dissolution rate of the solder, the separation rate and damage ra...

Embodiment 3

[0043] A method for wet separation of electronic components in waste circuit boards of the present invention and an embodiment of the tin stripper, comprising the following steps:

[0044] 1) Prepare reagents: Dissolve sodium hydroxide and sodium citrate in water to form a solution I with a concentration of sodium hydroxide of 250 g / L and a concentration of sodium citrate of 40 g / L. The volume of this solution I is 500 ml.

[0045] 2) Separation of tin stripping: Clean and dry the 6cm×6cm discarded desktop computer circuit board with electronic components, put it into 500ml solution I, and put the discarded circuit board at a flow rate of 6mL / min at 70°C. Add tert-butyl hydroperoxide to the solution I of the board and stir it fully. At the same time, use ultrasonic vibration to oscillate the solution, filter it after 30 minutes of treatment, separate the electronic components from the circuit board, and count the dissolution rate of the solder, the separation rate and damage of...

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Abstract

The invention discloses a method for wet separation of electronic components in a discarded printed circuit board. The method comprises the following steps that strong base and a complex agent are dissolved into water to obtain a solution I, wherein the concentration of the strong base is 150-300 g/L, and the concentration of the complex agent is 20-40 g/L; the discarded printed circuit board is cleaned, dried and then placed into the solution I, an oxidizing agent is added into the solution I at the flow rate accounting for 0.5-2.5% of the volume of the solution I every minute on the condition of 30-70 DEG C, the mixture is stirred, is subjected to a reaction for 20-40 minutes and is filtered, and then the electronic components are separated from the printed circuit board. The method has the advantages that the separation speed is high, little damage is caused to the electronic components, and the method is suitable for industrial application. The invention further discloses a tin stripping agent. The tin stripping agent comprises an aqueous solution with the strong base and the complex agent dissolved therein and the oxidizing agent, wherein the oxidizing agent is continuously added to the aqueous solution containing the strong base and the complex agent when the tin stripping agent is used. The tin stripping agent is simple in ingredient and little in corrosivity, and valuable metals can be extracted and recycled easily.

Description

technical field [0001] The invention belongs to the technical field of waste recycling, and in particular relates to a method for wet separation of electronic components in waste circuit boards and a tin stripper. Background technique [0002] With the rapid development of the electronic information industry, the replacement speed of electronic products is gradually accelerating, and the disposal of electronic waste has become one of the problems that need to be solved urgently in the world. The circuit board is one of the most important components of electronic devices. At present, most of the recycling of printed circuit boards in China is focused on the material recycling of printed circuit boards and their components. It is more important to consider the functional reuse of separated components. few. There are a large number of electronic devices such as resistors, capacitors, and IC chips assembled on circuit boards. When recycling materials is the goal, due to the dif...

Claims

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Application Information

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IPC IPC(8): C23F1/40C22B25/06
CPCC22B25/06C23F1/40Y02P10/20
Inventor 郭学益刘子康田庆华李栋
Owner HUNAN JIANG YE MECHANICAL & ELECTRICAL TECH CO LTD
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