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Method for leaching metallic copper from waste printed circuit board by using ionic liquid

A technology for printed circuit boards and ionic liquids, applied in the field of leaching metal copper, can solve problems such as large consumption of reagents and equipment corrosion

Inactive Publication Date: 2012-08-22
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, hydrometallurgy also has the problems of corrosion of equipment and large consumption of reagents.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Example 1: First, use a high-speed cutting machine to cut waste printed circuit boards into small pieces smaller than 50mm×50mm, then use a universal pulverizer to crush them, and finally sieve them with a national standard sieve to select samples with a particle size of 0.25-0.5mm , drying; Weigh 1g of sample in a conical flask, add 5mL of 30% hydrogen peroxide, then add 15mL of 60% ionic liquid 1-butyl-3-methylimidazolium bisulfate aqueous solution, the solid-to-liquid ratio is 1g : 20mL, covered and leached for 2h in a constant temperature water bath shaking box at 20°C, the shaking frequency was 50 rpm; the obtained leachate was suction filtered, washed, and constant volume, and the measured copper content was 92.3%.

Embodiment 2

[0011] Embodiment 2: First, use a high-speed cutting machine to cut waste printed circuit boards into small pieces smaller than 50mm×50mm, then use a universal pulverizer to crush them, and finally sieve them with a national standard sieve to select samples with a particle size of 0.25-0.5mm , drying; Weigh 1g of sample in a conical flask, add 10mL of 30% hydrogen peroxide, then add 15mL of 10% ionic liquid 1-butyl-3-methylimidazolium bisulfate aqueous solution, the solid-to-liquid ratio is 1g : 25mL, covered and leached for 2h in a constant temperature water bath shaking box at 50°C, the shaking frequency was 150 rpm; the obtained leachate was suction filtered, washed, and constant volume, and the measured copper content was 94.6%.

Embodiment 3

[0012] Embodiment 3: First, use a high-speed cutting machine to cut waste printed circuit boards into small pieces smaller than 50mm×50mm, then use a universal pulverizer to crush them, and finally sieve them with a national standard sieve to select samples with a particle size of 0.25-0.5mm , drying; Weigh 1g of sample in a conical flask, add 5mL of 30% hydrogen peroxide, then add 15mL of 20% ionic liquid 1-butyl-3-methylimidazolium bisulfate aqueous solution, the solid-liquid ratio is 1g : 20mL, covered and leached for 2h in a constant temperature water-bath shaking box at 60°C, the shaking frequency was 250 rpm; the obtained leachate was suction filtered, washed, and constant volume, and the copper content was measured to be 94.0%.

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PUM

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Abstract

The invention discloses a method for leaching metallic copper from a waste printed circuit board by using ionic liquid. The method comprises the following steps of: cutting the waste printed circuit board into pieces; crushing by using a universal pulverizer; screening; baking a selected sample of which the grain size is 0.25-0.5mm; weighing the sample in a conical flask; adding 30 percent of hydrogen peroxide; then, adding ionic liquid 1-butyl-3-methylimidazolium hydrogen sulfate aqueous solution of which the concentration is 10-80 percent to enable solid-to-liquid ratio to be 1g:(7-55mL), wherein the volume ratio of the hydrogen peroxide to the ionic liquid 1-butyl-3-methylimidazolium hydrogen sulfate aqueous solution is 1:(1.5-6); capping a thermostatic waterbath vibration tank of 20-80 DEG C and leaching for 1-24 hours, wherein the vibration frequency is 50-250 turns per minute; performing suction filtration on obtained lixivium, washing, enabling volume to be constant, and measuring copper content. According to the method for leaching the metallic copper from the waste printed circuit board by using the ionic liquid, the copper in the waste printed circuit board is leached by using the ionic liquid 1-butyl-3-methylimidazolium hydrogen sulfate aqueous solution is used as a leaching agent, wherein the copper content reaches 90-95 percent.

Description

technical field [0001] The invention relates to a method for leaching metallic copper from waste printed circuit boards, and belongs to the fields of electronic waste resource treatment and valuable metal recovery. Background technique [0002] Printed Circuit Boards (PCBs) are the basic components of electronic and electrical products, and are widely used in information, communication, consumer electronics and other fields. With the development of the electronic industry, as an important part of electronic products, the number of printed circuit boards is increasing sharply, and the number of printed circuit boards is also increasing. Waste Printed Circuit Boards (WPCBs) are becoming one of the main sources of electronic waste, which contain toxic and harmful substances such as halogenated flame retardants and heavy metals (lead, cadmium, mercury, etc.). serious harm to the environment. On the other hand, waste printed circuit boards contain a large amount of precious met...

Claims

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Application Information

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IPC IPC(8): C22B3/16C22B7/00C22B15/00
CPCY02P10/20
Inventor 陈梦君陈海焱段涛谌书黄金秀
Owner SOUTHWEAT UNIV OF SCI & TECH
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