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Method for recycling and treating waste circuit board

A waste circuit board, recycling technology, applied to the improvement of process efficiency, photography technology, instruments, etc., can solve the problems of winding, toxicity, impact pyrolysis, etc., and achieve high efficiency

Inactive Publication Date: 2011-01-05
惠州市雄越保环科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, CB is mainly a flat composite material composed of reinforced resin board and attached copper foil and other metals. It has high hardness, toughness and good bending resistance, and is difficult to break. (Lead and tin, etc.) are easy to cause entanglement; and because PCBs usually contain brominated flame retardants, such as dry crushing at room temperature, it is easy to cause impact pyrolysis, which will decompose the organic matter in the PCB and release toxic organic gases and dust ,create pollution

Method used

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  • Method for recycling and treating waste circuit board

Examples

Experimental program
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Effect test

Embodiment 1

[0013] Referring to Figure 1: A method for recycling waste circuit boards, the steps are: A. Use a pulverizer to crush waste circuit boards into granules, the particle size of which is less than 3mm; B. Put the granules in step A into the reactor for microbial fermentation A kind of leaching reaction, the reaction is made uniform by repeated stirring, the reaction temperature is 25 ℃, the concentration of bacteria is 10mg / l; C, the mixture of step B is separated by a filter, and the solid suspension filtered out is ring The mixture of oxygen resin and glass fiber, the filtrate flows into the mixing and settling tank in the extraction process; D, add the extractant in the mixing and settling tank, after the copper is dissolved in the extracting agent, the filtrate is divided into the upper copper-loaded organic phase and the lower layer The extraction raffinate, divide the organic phase loaded with copper into the stripping tank; E, add inorganic acid in the stripping tank, so t...

Embodiment 2

[0016] In the recovery treatment method of waste circuit board of embodiment 1, described reaction temperature is 28 ℃, and the concentration of bacterial classification is 9mg / l; The microbial bacterial classification in the described step B is Thiobacillus thiooxidans, described The extractant in step D is RE-609; the inorganic acid in step E is sulfuric acid.

[0017] For sufficient recovery, it also includes the step of returning the raffinate in step D to leaching after the oil slick is scraped off. It also includes the step of returning the copper-poor electrolytic solution in the upper layer in step E to extraction treatment. The purity of the obtained elemental copper reaches 99%

Embodiment 3

[0019] In the recovery treatment method of waste circuit board of embodiment 1, described reaction temperature is 30 ℃, and the concentration of bacterial classification is 8mg / l; The microbial bacterial classification in the described step B is Thiobacillus ferrooxidans, Thiobacillus ferrooxidans , the extractant in the step D is N-902 and the inorganic acid in the step E is nitric acid.

[0020] For sufficient recovery, it also includes the step of returning the raffinate in step D to leaching after the oil slick is scraped off. It also includes the step of returning the copper-poor electrolytic solution in the upper layer in step E to extraction treatment. The purity of the obtained copper element reaches 99%.

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Abstract

The invention relates to a method for recycling and treating a waste circuit board. The method comprises the following steps of: A, grinding the waste circuit board into particles by using a grinder; B, putting the particles obtained in the step A into a reaction kettle, performing a microbial strain leaching reaction and stirring repeatedly to react uniformly, wherein the reaction temperature is between 25 and 30 DEG C and the concentration of the strain is between 8 and 10 mg / l; C, separating a mixture obtained in the step B by using a filtering machine and allowing filtrate to flow into a mixer settler in an extraction process; D, adding an extracting agent into the mixer settler and shunting a copper-loaded organic phase into a back-extraction groove; E, adding inorganic acid into the back-extraction groove, partitioning copper-loaded solution into lower layer copper-rich electrolyte and upper layer copper-poor electrolyte and shunting the lower layer copper-rich electrolyte into an electrolytic bath; and F, electrolyzing copper electrolyte in the electrolytic bath to obtain elementary copper. The method has the advantages of low treatment cost, good environmental protection and high treatment capability.

Description

technical field [0001] The invention relates to the field of environmental protection, in particular to a method for recycling waste circuit boards. Background technique [0002] At present, the methods for processing PCB mainly include several processing technologies such as wet method, fire method, and mechanical method. (1) Wet treatment is divided into acid etching method and selective leaching method due to the different leaching agents used. The acid etching method is to use a strong oxidizing acid (mainly aqua regia) to treat the waste printed circuit board, oxidize the metal contained in it into ions and enter the solution, and then use the difference in the reducibility of various metal ions from the solution. Metal recovery by replacement or electrolytic treatment requires the use of highly corrosive chemical reagents, and this method is likely to cause secondary pollution. The selective leaching method mainly uses precious metals such as gold and silver to react...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B3/18C22B3/26C25C1/12C22B15/00
CPCY02P10/20
Inventor 毛文雄周娅萍
Owner 惠州市雄越保环科技有限公司
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