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Method for leaching copper in waste printed circuit board by virtue of glycine solution

A printed circuit board, glycine technology, applied in the direction of improving process efficiency, can solve problems such as damage, acid waste liquid needs additional treatment, improper operation, etc., to achieve the effect of high leaching efficiency, convenient subsequent treatment, and low energy consumption

Inactive Publication Date: 2019-12-31
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patent CN107574310A discloses a method for efficiently leaching copper from waste circuit boards. The polymetallic powder of waste circuit boards is mixed with sulfuric acid solution, and manganese oxide ore is added as an oxidant for leaching. The copper leaching rate reaches more than 96%, but the method uses Sulfuric acid solution is used as a leaching agent, which has certain dangers. Improper operation can easily cause harm to the human body, and the acidic waste liquid generated by leaching needs additional treatment.

Method used

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  • Method for leaching copper in waste printed circuit board by virtue of glycine solution
  • Method for leaching copper in waste printed circuit board by virtue of glycine solution
  • Method for leaching copper in waste printed circuit board by virtue of glycine solution

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Experimental program
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Effect test

Embodiment 1

[0024] Firstly, the waste printed circuit boards are manually dismantled, and then crushed to a particle size of ≤1 mm with a biaxial shear and a crusher. Then prepare a glycine solution in a 500mL beaker, stir it with a glass rod, add hydrogen peroxide, and set the volume to 200mL with ultrapure water, stir evenly with a magnetic stirring bar, and finally obtain a concentration of 1mol / L glycine and a volume fraction of 2.5%. A mixed solution of hydrogen peroxide is used as a leaching agent. Add the crushed waste printed circuit board powder, the ratio of the powder to the leaching agent is 5g / L, the temperature is controlled at 30°C, and the magnetic stirrer is continuously stirred and leached for 480min, and the obtained mixture is diluted by centrifugal filtration to measure the copper content. The leaching rate of copper was calculated to be 78.65%.

Embodiment 2

[0026] Other conditions are consistent with embodiment 1, carry out experiment at different temperatures, and concrete result is as follows:

[0027] Table 1 Experiments at different temperatures

[0028]

[0029]

[0030] It can be seen from Table 1 that the copper leaching effect is better at room temperature to 40°C, and the copper leaching effect is best at 30°C, and the preferred temperature is 30°C.

Embodiment 3

[0032] Other conditions are consistent with embodiment 1, mix different volume fraction hydrogen peroxide in leaching agent and carry out experiment, concrete result is as follows:

[0033] Table 2 Experiments of different hydrogen peroxide concentrations

[0034]

[0035] It can be seen from Table 2 that when the volume fraction of hydrogen peroxide in the leaching agent is 5.0-10%, the leaching effect of copper is better, and when the volume fraction of hydrogen peroxide in the leaching agent is 10%, the leaching effect of copper is the best, and peroxide is preferred. The hydrogen volume fraction is 10%.

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Abstract

The invention discloses a method for leaching copper in a waste printed circuit board by virtue of a glycine solution. The method for leaching copper in the waste printed circuit board by virtue of the glycine solution comprises the following steps: obtaining a waste printed circuit board sample with a small particle size through disassembly and mechanical breaking treatment; placing the pretreated sample into a mixed leaching agent of glycine and hydrogen peroxide under a stirring condition, leaching at constant temperature for a period of time, filtering the leachate, and leaching copper. According to the method for leaching copper in the waste printed circuit board by virtue of the glycine solution, the method of wet metallurgy is adopted, glycine is selected as the leaching agent for leaching the metal copper in the waste printed circuit board, and has environment friendliness and high efficiency compared with a traditional leaching agent, the highest leaching rate for copper is upto 94%; and the method is an environment-friendly treatment method.

Description

technical field [0001] The invention relates to a method for recycling waste printed circuit board resources, in particular to a method for extracting copper in waste printed circuit boards by using glycine. Background technique [0002] In recent years, with the rapid development of electronic technology and electronic information industry, various electronic products emerge in an endless stream. Various electronic equipment such as mobile phones, computers, and home appliances are becoming more and more popular. The service life of electronic products is getting shorter and shorter, and the replacement speed of electronic products is accelerating. , leading to a sharp increase in the amount of e-waste. Printed circuit boards are one of the most important components of electronic equipment, and their quantity has also increased with the increase in the amount of electronic waste. Waste printed circuit boards contain a large number of metal resources, including basic metals...

Claims

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Application Information

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IPC IPC(8): C22B15/00C22B7/00
CPCC22B7/007C22B15/0073Y02P10/20
Inventor 陈梦君韩昀晖舒建成王蓉符俊灵易小霞
Owner SOUTHWEAT UNIV OF SCI & TECH
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