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Method capable of improving bioleaching efficiency of valuable metals in waste printed circuit boards

A technology for printed circuit boards and valuable metals, which is applied in the field of improving the bioleaching efficiency of valuable metals in waste printed circuit boards, can solve the problems of low leaching rate, slow bioleaching rate, and long time consumption, and achieve increased leaching efficiency, combined The effect of strong ability and moderate molecular weight

Active Publication Date: 2019-05-07
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current waste printed circuit board technology has the disadvantages of slow bioleaching rate, long time-consuming, and unstable microbial growth. Low rate and other issues

Method used

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  • Method capable of improving bioleaching efficiency of valuable metals in waste printed circuit boards

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Effect test

Embodiment 1

[0024] A method for improving the bioleaching efficiency of valuable metals in waste printed circuit boards, the process flow chart is as follows figure 1 shown, including the following steps:

[0025] (1) Broken

[0026] Crushing the waste printed circuit boards to make the particle size ≤0.25mm; washing and sorting and drying.

[0027] (2) Bacterial activation:

[0028] Ferroplasma acidophilus, Thiobacillus ferrooxidans and Thermobacterium acidophilus were prepared in a volume ratio of 1:2:3 to make mixed acidophilic bacteria, and the mixed acidophilic bacteria were activated with 9K medium, and the inoculation ratio was 10 %(V / V), the culture temperature is 45°C, the rotation speed is 170r / min, and the culture time is 24h to form a bacterial suspension;

[0029] The bacterial suspension was transferred to an Erlenmeyer flask containing 9K medium at 10% (V / V), and placed in a constant temperature shaking shaker with a temperature of 45°C and a rotation speed of 170r / min f...

Embodiment 2

[0033] A method for improving the bioleaching efficiency of valuable metals in waste printed circuit boards, comprising the following steps:

[0034] (1) Broken

[0035] Crushing the waste printed circuit boards to make the particle size ≤0.25mm; washing and sorting and drying.

[0036] (2) Bacterial activation:

[0037] Ferroplasma acidophilus, Thiobacillus ferrooxidans and Thermobacterium acidophilus were prepared in a volume ratio of 1:2:3 to form a mixed acidophilus, and the mixed acidophilus was activated with 9K medium, and the inoculation ratio was 20 %(V / V), the culture temperature is 30°C, the rotation speed is 90r / min, and the culture time is 48h to form a bacterial suspension;

[0038] The bacterial suspension was transferred to an Erlenmeyer flask containing 9K medium at 15% (V / V), and placed in a constant temperature shaking shaker with a temperature of 40°C and a rotation speed of 150r / min for 30h to form an activated bacterial liquid. The density of microscop...

Embodiment 3

[0042] A method for improving the bioleaching efficiency of valuable metals in waste printed circuit boards, comprising the following steps:

[0043] (1) Broken

[0044] The waste printed circuit boards are crushed to make the particle size ≤0.25mm; after washing and sorting, put them into the drying box for drying.

[0045] (2) Bacterial activation:

[0046] Ferroplasma acidophilus, Thiobacillus ferrooxidans and Thermobacterium acidophilus were prepared in a volume ratio of 1:2:3 to make mixed acidophilic bacteria, and the mixed acidophilic bacteria were activated with 9K medium, and the inoculation ratio was 15 %(V / V), the culture temperature is 40°C, the rotation speed is 150r / min, and the culture time is 30h to form a bacterial suspension;

[0047] The bacterial suspension was transferred to an Erlenmeyer flask containing 9K medium at 20% (V / V), and placed in a constant temperature shaking shaker with a temperature of 30°C and a rotation speed of 90r / min for 48h to form ...

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Abstract

The invention relates to a method capable of improving the bioleaching efficiency of valuable metals in waste printed circuit boards, and belongs to the technical field of solid waste recycling. The method comprises the steps that 1) broken waste printed circuit boards are ultrasonically cleaned and then placed in a drying oven for drying; 2) activated culture is carried out on mixed acidophilic bacteria by using a 9K medium at medium temperature; 3) the crushed waste printed wiring board powder and humic acid are placed in a microbial reactor containing mixed acidophilic bacteria for bioleaching of the valuable metals. The equipment required by the method is simple, and the method is low-cost and environmentally friendly, and can greatly improve the efficiency of leaching valuable metalsfrom waste printed wiring boards by utilizing microorganisms.

Description

Technical field: [0001] The invention belongs to the technical field of solid waste recycling, and in particular relates to a method for improving the bioleaching efficiency of valuable metals in waste printed circuit boards. Background technique: [0002] Due to the advantages of low cost, low energy consumption, simple operation and environmental friendliness, microbial leaching technology has received more and more attention and research in the field of resource utilization of waste printed circuit boards. However, the current waste printed circuit board technology has the disadvantages of slow bioleaching rate, long time-consuming, and unstable microbial growth. issues such as low rates. Therefore, it is urgent to improve the microbial leaching rate by various means. Invention content: [0003] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a method for improving the bioleaching efficiency of valuable metals in waste...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B3/18C22B15/00C22B19/30C22B19/20
CPCY02P10/20
Inventor 佟琳琳杨洪英赵前飞金哲男张勤陈国宝
Owner NORTHEASTERN UNIV
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