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A method of recovering pure copper from waste circuit boards

A waste circuit board and pure copper technology, which is applied to the improvement of process efficiency, instruments, optics, etc., can solve the threat of human living environment, waste of resources and other problems, and achieve the effects of low environmental pollution, low energy consumption and high process efficiency

Active Publication Date: 2020-01-14
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The replacement speed of electronic products (such as mobile phones, computers, etc.) is accelerating. If the waste circuit boards are not reused, it will not only cause a great waste of resources, but also cause a great threat to the human living environment if they are not handled properly.

Method used

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  • A method of recovering pure copper from waste circuit boards

Examples

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Effect test

Embodiment 1

[0020] Crush the waste circuit boards to a particle size of 0.3 mm or less, and separate non-metal and metal by flotation of the crushed particles, and ball mill the metal-enriched body obtained by flotation separation to 0.074 mm or less. Add vulcanizing agent at a mass ratio of 1:0.5, vulcanize for 2 hours at a temperature of 150°C, and then separate from the vulcanized metal-enriched body by flotation at a stirring speed of 1600rpm, air filling rate of 100L / h, and pulp concentration of 100g / L Obtain the copper-enriched body; the copper-enriched body is used as an electrodeposition raw material and is packed in an anode bag for electroplating, wherein the ratio of the amount of electrolyte to the powder amount is 40ml:0.5g, and then the anode bag is set on the anode plate and placed in the anode area , connected to the DC power supply to provide a voltage of 10V, the cathode plate was made of stainless steel, and the deposited copper was recovered from the cathode plate after...

Embodiment 2

[0022] Crush the waste circuit boards to a particle size of 0.3 mm or less, and separate non-metal and metal by flotation of the crushed particles, and ball mill the metal-enriched body obtained by flotation separation to 0.074 mm or less. Add vulcanizing agent at a mass ratio of 1:0.5, vulcanize for 2 hours at a temperature of 150°C, and then separate from the vulcanized metal-enriched body by flotation at a stirring speed of 1650rpm, air filling rate of 100L / h, and pulp concentration of 100g / L Obtain the copper-enriched body; the copper-enriched body is packed in the anode bag for electroplating as the electrodeposition raw material, wherein the ratio of the amount of electrolyte to the powder amount is 40ml:1g, then the anode bag is set on the anode plate and placed in the anode area, The DC power supply was connected to provide a voltage of 10V. The cathode plate was made of pure copper. After 10 minutes of electrolysis, the deposited copper was recovered from the cathode p...

Embodiment 3

[0024] Crush the waste circuit boards to a particle size of 0.3 mm or less, and separate non-metal and metal by flotation of the crushed particles, and ball mill the metal-enriched body obtained by flotation separation to 0.074 mm or less. Add vulcanizing agent at a mass ratio of 1:0.5, vulcanize for 2 hours at a temperature of 150°C, and then separate from the vulcanized metal-enriched body by flotation at a stirring speed of 1650rpm, air filling rate of 100L / h, and pulp concentration of 100g / L Obtain the copper-enriched body; the copper-enriched body is packed in the anode bag for electroplating as the electrodeposition raw material, wherein the ratio of the electrolyte consumption to the powder consumption is 40ml:1g, then the anode bag is set on the anode plate and placed in the anode area, The DC power supply was connected to provide a voltage of 5V. The cathode plate was made of pure copper. After 10 minutes of electrolysis, the deposited copper was recovered from the cat...

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Abstract

The invention discloses a method for recovering pure copper from a waste circuit board. The method comprises two steps of flotating separating copper concentrate from the waste circuit board and extracting pure copper from the copper concentrate through an electrodeposition method; the step of flotating separating the copper concentrate from the waste circuit board is characterized in that the waste circuit board is crushed to enable the particle size to be 0.3 mm or less, crushed particles are subjected to floatation separation to separate non-metal and metal, ball milling is carried out on metal concentrate obtained by floatation separation to enable the particle size to be 0.074mm or less, then vulcanization treatment is carried out, and then flotation separation is carried out to obtain the copper concentrate from the vulcanized metal concentrate; and the step of extracting the pure copper from the copper concentrate through the electrodeposition method is characterized in that anH-shaped electrolytic tank separated by ion exchange membranes is adopted, the copper concentrate obtained by flotation is used as a deposition raw material to be arranged in an anode bag for electroplating, and the copper concentrate is electrolyzed for a period of time and then is recycled from a cathode plate to obtain the pure copper.

Description

technical field [0001] The invention relates to the field of electronic waste recycling, in particular to a technology for recycling pure copper from waste circuit boards. Background technique [0002] The replacement speed of electronic products (such as mobile phones, computers, etc.) is accelerating. If waste circuit boards are not reused, it will not only cause a great waste of resources, but also pose a great threat to the human living environment if they are not handled properly. Waste circuit boards contain a large amount of metal and non-metal materials, and some materials are extremely harmful, such as flame retardant bromine, which is not only a threat to the environment but also to human health. Heavy metal substances in waste circuit boards enter Soil water will pose a major threat to people's health. But at the same time, waste circuit boards are excellent available resources. The metal content of the elements that make up circuit boards can be as high as 49%, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B15/00C25C1/12
CPCC22B7/00C22B15/00C25C1/12Y02P10/20
Inventor 刘洪军魏学昊李亚敏李斌
Owner LANZHOU UNIVERSITY OF TECHNOLOGY