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Method for recovering metal copper in waste circuit board

A technology for discarding circuit boards and metal copper, applied in the improvement of process efficiency, photography technology, instruments, etc., can solve the problems affecting the comprehensive utilization of non-metal circuit board powder, difficult to effectively recycle, etc., and achieve high added value of products and process flow. The effect of shortening and improving the ecological environment

Inactive Publication Date: 2012-02-29
GUANGZHOU RES INST OF NON FERROUS METALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the "crushing-separating" method is mainly used to recover metallic copper in copper-clad circuit boards. This method can effectively recover large particles of metallic copper in circuit board powder, but the particle size of -0.5mm accounts for 80% of circuit boards. Part of the fine-grained metal copper in the powder is difficult to effectively recover, and the residual metal copper content in the powder is still as high as 0.3~0.7%, which seriously affects the comprehensive utilization of non-metallic circuit board powder

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Copper-clad circuit board powder with a metal copper content of 21.68% is crushed to a particle size of -0.5mm, accounting for 80%.

[0019] (1) Strain cultivation: the strain used is Acidithiobacillus ferrooxidans, the medium is ammonium sulfate 5.0 g / L, potassium chloride 0.2 g / L, dipotassium hydrogen phosphate 0.8 g / L, Calcium nitrate 0.03 g / L and ferrous sulfate 50 g / L, pH 1.3, aerated culture for 36 h, to obtain a bacterial culture solution in which the bacteria are in the logarithmic growth phase;

[0020] (2) Biological leaching: Pile copper-clad circuit board powder into a leaching tank with a spray pipe network, and spray with the above-mentioned bacterial culture solution with a spray intensity of 25L / m 2 .h, the bacterial culture solution reacts with the metallic copper in the copper-clad circuit board, and the resulting copper sulfate solution penetrates to the bottom layer, flows out from the drain pipe at the bottom, enters the liquid collection tank, and ...

Embodiment 2

[0024] Copper-clad circuit board powder with a metal copper content of 0.67% has a particle size of -0.5mm, accounting for 80%.

[0025] (1) Strain cultivation: the strain used is Acidithiobacillus ferrooxidans, the medium is ammonium sulfate 4.0g / L, potassium chloride 0.1g / L, dipotassium hydrogen phosphate 0.6 g / L, Calcium nitrate 0.02 g / L and ferrous sulfate 45 g / L, pH 1.5, aerated culture for 36 h, to obtain a bacterial culture solution in which the bacteria are in the logarithmic growth phase;

[0026] (2) Biological leaching: Pile copper-clad circuit board powder into a leaching tank with a spray pipe network, and spray with the above-mentioned bacterial culture solution with a spray intensity of 30L / m 2 .h, the bacterial culture solution reacts with the metallic copper in the copper-clad circuit board, and the resulting copper sulfate solution penetrates into the bottom layer, flows out from the drain pipe at the bottom, and enters the liquid collection pool; circulates ...

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Abstract

The invention discloses a method for recovering metal copper in a waste circuit board. The method is characterized by consisting of the following steps of: preparing bacterial culture solution by taking acidithiobacillus ferrooxidans as a leaching strain and taking ammonium sulfate, potassium chloride, potassium acid phosphate, calcium nitrate and ferrous sulfate as a culture medium; circularly spraying the bacterial culture solution to obtain copper sulfate solution; extracting copper sulfate solution by taking Lix984 as an extracting agent and 260# kerosene as a diluting agent to obtain copper-carrying organic phase and raffinate; reversely extracting the copper-carrying organic phase by taking sulfuric acid aqueous solution as the extracting agent, until Cu<2+> concentration in the sulfuric acid aqueous solution reaches 43-48g / L; electrodepositing the sulfuric acid aqueous solution with Cu<2+> concentration of 43-48g / L and separating copper out at a cathode. The method has the advantages of environmental friendliness, mild reaction, shortened flow and metal copper recovery rate of 99.5 percent, and is suitable for recovering the metal copper in the waste circuit board.

Description

[0001] Technical field [0002] The present invention involves a method of recycling metal copper in the abandoned circuit board. Background technique [0003] my country is the world's largest printing circuit board production country. The output of the circuit board reaches 130 million square meters per year. According to the material utilization rate of about 90%, the corner waste produced by the printing circuit board is about 14.4 million square meters per year. 36,000 tons / year.In addition, the corner waste produced by the substrate manufacturer is about 7%of its finished product, and the corner waste produced by the copper -covered plate is about 25,000 tons / year.%, The waste circuit board generated by the entire machine plant is about 20,000 tons / year, and the above three total is about 81,000 tons / year.In addition, the total amount of waste circuit boards from electronic waste imported by my country and the disassembly of electronic products that are imported every year ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C1/12C22B7/00C22B3/18
CPCY02P10/20
Inventor 周吉奎邱显扬汤玉和刘勇
Owner GUANGZHOU RES INST OF NON FERROUS METALS
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