Method for leaching copper in waste printed circuit board by means of acidithiobacillus ferrooxidans

A technology of Thiobacillus ferrooxidans and printed circuit boards, which is applied in the field of copper recovery from waste printed circuit boards, can solve the problems of long leaching time, low leaching rate, and copper leaching rate without considering the growth of bacteria. , to achieve the effect of shortening the leaching time

Active Publication Date: 2015-08-26
YANGZHOU NINGDA NOBLE METAL CO LTD
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Problems solved by technology

[0007] The above-mentioned method of using Thiobacillus ferrooxidans to leach copper in waste gas printed circuit boards does not cons

Method used

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  • Method for leaching copper in waste printed circuit board by means of acidithiobacillus ferrooxidans

Examples

Experimental program
Comparison scheme
Effect test

Example

[0023] (Example 1)

[0024] The method for leaching copper from waste printed circuit boards of Thiobacillus ferrooxidans in this embodiment has the following steps:

[0025] ①Pretreatment of discarded printed circuit boards. The waste printed circuit board PCBs taken from an electronics factory in Changzhou are removed from the electronic components, and then crushed and ground into powder. The waste PCBs powder obtained by grinding is passed through a sieve of 100 μm to 200 μm (the waste printed circuit board obtained by grinding in this example) The powder passes through a 200μm sieve), and the waste PCBs that pass through the sieve are collected for processing.

[0026] After the waste PCBs processed in this example are ground and sieved, the main metal content is analyzed,

[0027] The main metal content is shown in Table 1 below:

[0028] Table 1 Main metal content in waste printed circuit board powder

[0029]

[0030] ② Domestication of strains.

[0031] The sludge extracted f...

Example

[0050] (Example 2)

[0051] The method for leaching copper from waste printed circuit boards by Thiobacillus ferrooxidans in this example is the same as Example 1, except that: step ④ is added to the strain culturing system that has been cultured for 64 hours in step ③. When disposing of the waste PCBs powder ， The adding amount of PCBs powder is 20g / L; after adding PCBs powder A.ferrooxidans When the culture was continued for 120h, the leaching reaction was finished; after the leaching reaction, the copper leaching rate in the waste PCBs was determined to be 88.6%.

Example

[0052] (Example 3)

[0053] The method for leaching copper from waste printed circuit boards by Thiobacillus ferrooxidans in this example is the same as Example 1, except that: during the leaching process of step ④, the dissolved oxygen in the culture solution in the 5l fermentor is controlled At 30%-40%, after the leaching reaction is over, the copper leaching rate in waste PCBs is determined to be 96.7%.

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Abstract

The invention discloses a method for leaching copper in a waste printed circuit board by means of acidithiobacillus ferrooxidans. According to the method, the acidithiobacillus ferrooxidans is promoted to leach the copper in the waste printed circuit board through two-stage dissolved oxygen control. The method for leaching the copper in the waste printed circuit board by means of the acidithiobacillus ferrooxidans comprises the steps that firstly, the acidithiobacillus ferrooxidans obtained after copper resistance domestication is completed is cultured under the low dissolved oxygen condition till the acidithiobacillus ferrooxidans growth mass approaches the maximum value; secondly, waste printed circuit board powder is added to an acidithiobacillus ferrooxidans culture system, the content of dissolved oxygen in the acidithiobacillus ferrooxidans culture system is increased after the waste printed circuit board powder is added, and the copper in the waste printed circuit board is leached by means of the acidithiobacillus ferrooxidans under the high dissolved oxygen condition. By the adoption of the method, the acidithiobacillus ferrooxidans concentration and the copper leaching rate are both maximized, and the overall leaching time is greatly shortened.

Description

technical field [0001] The invention relates to a method for recovering copper in waste printed circuit boards, in particular to a method for leaching copper in waste printed circuit boards by Thiobacillus ferrooxidans. Background technique [0002] Waste printed circuit boards (Printed Circuit Boards, PCBs) usually contain about 40% metal, of which copper is the main component, with a content as high as 20% to 30%. It is estimated that my country needs to process more than 500,000 tons of PCBs every year and it is growing at a rate of 22%. If the disposal and recycling of waste PCBs can be realized, it can not only solve the problem of environmental pollution, but also realize the effective recovery of metals, which will be of great significance to the sustainable development of my country's PCBs industry. [0003] At present, there are mainly physical, chemical and biological methods for extracting copper from PCBs. The physical method has relatively high evaluation ind...

Claims

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Application Information

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IPC IPC(8): C22B3/18C22B15/00C22B7/00
CPCY02P10/20
Inventor 梁国斌刘维平汪斌周全法
Owner YANGZHOU NINGDA NOBLE METAL CO LTD
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