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An electrolysis device and method for recovering high-purity copper from waste circuit boards

A technology of waste circuit boards and electrolysis method, applied in the field of electrolysis devices, can solve the problems of large power consumption, short process, and reduce the purity of copper products, and achieve the effect of saving energy

Active Publication Date: 2016-02-17
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Doing so consumes a lot of power, so it is necessary to find a relatively short process and energy-saving recovery method
Because the metal powder obtained by crushing and screening the circuit board contains a variety of metals, such as iron, tin, zinc, gold, platinum, palladium, etc., during the electrolysis process, some metals other than copper will dissolve into the electrolyte solution, and the copper ions will be mixed in the cathode. eutectoid thus reducing the purity of the copper product

Method used

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  • An electrolysis device and method for recovering high-purity copper from waste circuit boards

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Experimental program
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Effect test

Embodiment 1

[0021] 1. Circuit board crushing and winnowing: According to the process flow, 5kg of waste circuit boards are crushed and winnowed, and finally 1kg of metal powder is obtained.

[0022] 2. Cleaning of raw materials and equipment: Soak and wash the metal powder with 75% alcohol and ultrapure water for 3 times in sequence, and finally dry it in a drying oven at 30°C at a constant temperature. The anode basket 105, the filter cloth 104, the stainless steel cathode 102, the three chambers 101 / 108 / 106, and the stirring magnet 107 were washed three times with ultrapure water and dried in a drying oven at 30°C at a constant temperature.

[0023] 3. Preparation of electrolyte and selective permeate: (1) Preparation of anolyte: take 50g CuSO 4 , 50mgNaCl with pH value of 4 H 2 SO 4 Dissolve in a beaker and transfer the solution to a 1 L volumetric flask with pH 4 H 2 SO 4 Constant volume obtains composition and is 50g / LCuSO 4 , 50mg / LNaCl electrolyte in the anode chamber. (2) El...

Embodiment 2

[0027] 1. Circuit board crushing and winnowing: According to the process flow, 5kg of waste circuit boards are crushed and winnowed, and finally 1kg of metal powder is obtained.

[0028] 2. Cleaning of raw materials and equipment: Soak and wash the metal powder with 75% alcohol and ultrapure water for 3 times in sequence, and finally dry it in a drying oven at 30°C at a constant temperature. The anode basket 105, the filter cloth 104, the stainless steel cathode 102, the three chambers 101 / 108 / 106, and the stirring magnet 107 were washed three times with ultrapure water and dried in a drying oven at 30°C at a constant temperature.

[0029] 3. Preparation of electrolyte and selective permeate: (1) Preparation of anolyte: take 40g CuSO 4 , 45mgNaCl with pH value of 4 H 2 SO 4 Dissolve in a beaker and transfer the solution to a 1 L volumetric flask with pH 4 H 2 SO 4 Constant volume obtains composition and is 40g / LCuSO 4 , 45mg / LNaCl electrolyte in the anode chamber. (2) El...

Embodiment 3

[0033] 1. Circuit board crushing and winnowing: According to the process flow, 5kg of waste circuit boards are crushed and winnowed, and finally 1kg of metal powder is obtained.

[0034]2. Cleaning of raw materials and equipment: Soak and wash the metal powder with 75% alcohol and ultrapure water for 3 times in sequence, and finally dry it in a drying oven at 30°C at a constant temperature. The anode basket 105, the filter cloth 104, the stainless steel cathode 102, the three chambers 101 / 108 / 106, and the stirring magnet 107 were washed three times with ultrapure water and dried in a drying oven at 30°C at a constant temperature.

[0035] 3. Preparation of electrolyte and selective permeate: (1) Preparation of anolyte: take 45g CuSO 4 , 47.5mgNaCl with pH 4 H 2 SO 4 Dissolve in a beaker and transfer the solution to a 1 L volumetric flask with pH 4 H 2 SO 4 Constant volume obtains composition and is 45g / LCuSO 4 , 47.5mg / LNaCl electrolyte in the anode chamber. (2) Electrol...

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Abstract

The invention relates to an electrolytic device and method for recovering high-purity copper from a waste circuit board, and belongs to the technical field of colored metallurgy. Because a large amount of impurities, namely Fe, Zn, Mg, Sn, Sb, and the like, are contained in anode metal powder, and when anode copper discharges, more active metals can also slightly discharge into a solution, a part of ions discharge with copper ions together on a cathode and are separated out on the cathode, so that the purity of a copper product is influenced. Thus, a selective permeation layer is added between an anode and the cathode for the selective passing of the copper ions in a point dissolution process, so that the purity of the copper product is enhanced. The method is particularly as follows: an extract layer carries out an extracting process at an anode chamber side and a back extraction process at a cathode chamber side by utilizing better selectivity of an extracting agent CP-150 on the copper ions, overall, only the copper ions move from the anode to the cathode, and the electric conductivity of the integral electrolytic device is ensured.

Description

Technical field: [0001] The invention relates to an electrolysis device and a method for recycling waste circuit boards, in particular to recovering high-purity copper from waste circuit boards in one step by means of a suspension electrolysis combined with ion selective passage. Background technique: [0002] Since waste circuit boards contain a large amount of valuable metals, the recovery of valuable metals in circuit boards has become a hot topic. The average content of copper in waste circuit boards is about 24%. As a metal with good electrical and thermal conductivity, copper is applied to various industries. However, with the rapid development of the modern semiconductor industry, the application of ultra-high-purity copper has been widely valued. If the purity of copper can reach 5N (99.999%) or higher 6N (99.9999%), applying this high-purity copper to the integrated circuit of audio equipment and making audio cables will greatly improve the fidelity of the sound; ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C1/12C25C7/00
CPCY02P10/20
Inventor 席晓丽聂祚仁张龙张力文邱立新
Owner BEIJING UNIV OF TECH