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Recovery method for waste circuit board

A technology of waste circuit boards and recycling methods, applied in the direction of electronic waste recycling, plastic recycling, recycling technology, etc., can solve the problems of incomplete separation, non-metallic materials cannot be fully recycled and reused, and achieve low processing costs and small investment , the effect of reducing the amount of processing

Inactive Publication Date: 2013-02-06
广东省资源综合利用研究所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to overcome the defects of incomplete separation of waste circuit boards in the prior art and the inability to fully recycle and reuse non-metallic materials, and propose a recycling method for waste circuit boards

Method used

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  • Recovery method for waste circuit board

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Example 1: 10kg of discarded circuit boards with a Cu content of 19.34% were broken to less than 2.0mm, and shaker sorted to obtain 1.95kg of copper particles with a Cu content of 95.49% and 8.05kg of tailings with a Cu content of 0.93%; crush the tailings to 0.1mm Next, 0.09 kg of copper powder with a copper content of 53.11% and 7.96 kg of non-metallic powder with a Cu content of 0.34% were obtained by shaking table separation; at 25°C, an acidic aqueous solution with a pH value of 1.5 containing Acidophilus ferrooxidans was used , the non-metallic powder was leached for 48h under the condition of liquid-solid ratio of 3 / 1, and 7.91kg of copper-rich solution and glass fiber resin composite material with Cu content of 0.05% were obtained. Using LIX860:LIX63:kerosene volume ratio=10:10:80 extraction agent, the phase ratio is 1, carry out 2-stage countercurrent cascade extraction, the extraction time of each stage is 20min, extract the copper-rich solution to obtain the c...

Embodiment 2

[0015] Example 2: 10 kg of waste circuit boards with a Cu content of 19.34% were broken to below 2.0 mm, and shaker sorting obtained 2.01 kg of copper particles with a Cu content of 93.54% and 7.99 kg of tailings with a Cu content of 0.71%; crushed tailings to 0.1 mm Next, 0.08 kg of metallic copper powder with a copper content of 49.52% and 7.91 kg of non-metallic powder with a Cu content of 0.2% were obtained by shaking table separation; The non-metallic powder was leached for 36 hours under the condition that the leaching liquid-solid ratio was 5 / 1, and 7.82 kg of copper-rich solution and glass fiber resin composite material with Cu content of 0.06% were obtained. Using LIX860N:LIX84:kerosene volume ratio = 5:5:90 extractant, phase ratio is 1, 4-stage countercurrent cascade extraction is carried out, the extraction time of each stage is 10min, and the copper-rich solution is extracted to obtain the copper-loaded organic phase and raffinate ; Under the condition that the rat...

Embodiment 3

[0016] Example 3: 10 kg of discarded circuit boards with a Cu content of 21.25% were broken to below 2.0 mm, and shaker sorting obtained 2.18 kg of copper particles with a Cu content of 93.11% and 7.82 kg of tailings with a Cu content of 1.17%; crushed tailings to 0.1 mm Next, 0.103 kg of metallic copper powder with a copper content of 58.56% and 7.71 kg of non-metallic powder with a Cu content of 0.4% were obtained by shaking table separation; The non-metallic powder was leached for 24 hours under the condition that the leaching liquid-solid ratio was 6 / 1, and 7.66 kg of copper-rich solution and glass fiber resin composite material with Cu content of 0.07% were obtained. Using LIX860:LIX64:kerosene volume ratio=15:15:70 extractant, with a ratio of 1, carry out 6-stage countercurrent cascade extraction, the extraction time of each stage is 5min, and extract the copper-rich solution to obtain the copper-loaded organic phase and raffinate ; Under the condition that the ratio is ...

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Abstract

The invention discloses a recovery method for a waste circuit board, which is characterized in that: the waste circuit board is cracked and reselected to obtain shot copper and tailings; the tailings are cracked and reselected to obtain copper powder and nonmetallic powder; an H2SO4 liquid is added into the nonmetallic powder so that a pH value is 1.5-3.5; acidithiobacillus ferrooxidans is used as a leaching strain under a temperature of 20-35 DEG C for leaching to obtain a copper-rich liquid and fiberglass resin composite material; an extracting agent with a volume ratio of hydroxyl aldoxime extracting agent to hydroxyl ketoxime extracting agent to kerosene being 5-20:5-20:60-90 to extract the copper-rich liquid is adopted to obtain loaded copper organic phase and raffinate; a 10-30 percent sulphuric acid liquid is used for re-extracting the loaded copper organic phase to obtain a re-extracting liquid and blank organic phase; and then electrodeposition is implemented on the re-extracting liquid to obtain cathode copper and electrodeposition barren liquor. The recovery method for the waste circuit board realizes green, economic and full-value recovery of the waste circuit board, has the advantages of short flow, less investment, high efficiency and low processing cost, and is suitable for recycling various waste circuit boards.

Description

technical field [0001] The invention relates to a method for recycling waste circuit boards. Background technique [0002] Waste circuit boards are leftovers and waste products produced in the production process of circuit boards. They are composed of high molecular polymer (resin), glass fiber or kraft paper and high-purity copper foil, etc. The metal copper content is generally 15~40%. Since electronic components have not been installed on such waste circuit boards, the disposal is relatively simple. At present, the physical technology of "crushing-gravity separation" is generally adopted at home and abroad, and metal copper can be recovered better. However, the main problem of this method is that the separation effect is not ideal, the recovery rate of metals mainly composed of copper is low, generally 90~95%; and the content of copper in non-metallic components mainly composed of glass fiber composite materials is relatively high , the copper content in the production ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09B3/00B29B17/02C22B7/00C22B3/18C22B3/30B22F9/04
CPCY02P10/20Y02W30/62Y02W30/82
Inventor 刘勇汤玉和刘牡丹周吉奎刘珍珍
Owner 广东省资源综合利用研究所
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