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A method for leaching copper in waste printed circuit boards with mixed bacteria

A printed circuit board and mixed bacteria technology, which is applied in the directions of microorganism-based methods, methods of using microorganisms, biochemical equipment and methods, etc., can solve the problems such as the decline of copper leaching ability, and achieve the improvement of copper leaching rate and simple process. , to promote the effect of leaching

Active Publication Date: 2017-06-16
YANGZHOU NINGDA NOBLE METAL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the ability of bacteria to leach copper is closely related to their own growth and metabolism. The addition of PCBs will inhibit the growth of bacteria and lead to a decrease in copper leaching ability. Therefore, how to optimize the way of adding PCBs is another key to achieve efficient leaching of copper in PCBs by mixed bacteria. one of the factors

Method used

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  • A method for leaching copper in waste printed circuit boards with mixed bacteria
  • A method for leaching copper in waste printed circuit boards with mixed bacteria
  • A method for leaching copper in waste printed circuit boards with mixed bacteria

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1）

[0029] The method for the mixed bacteria of the present embodiment to extract copper in waste printed circuit boards may further comprise the steps:

[0030] ① Pretreatment of waste printed circuit boards. The waste printed circuit board PCBs from which electronic components have been removed are crushed and ground into powder, and the ground waste PCBs powder passes through a sieve of 100 μm to 200 μm (in this example, the waste printed circuit board powder obtained through grinding passes through a 100 μm sieve) , to collect the waste PCBs powder passing through the sieve for processing.

[0031] After the discarded PCBs processed in this embodiment were ground and sieved, their main metal content was analyzed.

[0032] The main metal content is shown in Table 1 below:

[0033] Table 1 Main metal content in waste printed circuit board powder

[0034]

[0035] ② domestication of strains.

[0036] (1) Acidophilus Thiobacillus ferrooxidans ( A. ferrooxidans ) of domest...

Embodiment 2 to Embodiment 6）

[0065] The mixed bacteria of embodiment 2 to the method of embodiment 6 leaching copper in the waste printed circuit board all the other are the same as embodiment 1, difference is: the content of each component in the mixed bacteria culture solution used when step 3. mixed bacteria culture As well as the addition time and amount of waste printed circuit board powder in step ④, see Table 2 and Table 3 below for details.

[0066] Table 2 The content of each component in the mixed bacteria culture solution used in step ③ mixed bacteria culture

[0067]

[0068] Table 3 Addition time and amount of waste printed circuit board powder in step ④

[0069]

[0070] Note: The addition time mentioned in the above table refers to the time for powder addition after the start of the mixed bacteria culture in step ③; the added amount refers to the weight of waste printed circuit board powder added per 1L of mixed bacteria culture system , the unit is grams.

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Abstract

The invention discloses a method for extracting copper out of waste printed circuit boards by employing mixed bacteria. The method comprises the following steps: pre-treating waste printed circuit boards (PCBs) for later use; respectively carrying out copper-resistant domesticated incubation on acidithiobacillus ferrooxidans and acidithiobacillus thiooxidans, carrying out mixed cultivation in mixed bacteria culture liquid, and adding PCBs powder when the culture time reaches 40-55 hours; and adding the PCBs powder at other time points point by point in increase quantity, and carrying out biological extraction. Two bacteria can grow in balance without adjusting the pH value of the culture liquid in mixed bacterial cultivation; meanwhile, when the two bacteria grow, a lot of sulfuric acid and Fe<3+> are generated for extracting copper out of the waste PCBs powder in the later period; the overall process is high in efficiency; and energy sources are saved. In a front-low and rear-high multi-point adding manner, the extraction rate of copper is significantly improved on the basis of improving the adding amount of the waste PCBs powder; and the inhibition degree on bacterial cell growth is relatively low.

Description

[0001] This application is a divisional application of an invention patent application with the application number 201310457250.3 and the application date of September 30, 2013, and the invention name is "Method for Leaching Copper from Waste Printed Circuit Boards by Mixed Bacteria". technical field [0002] The invention relates to a method for recovering copper from waste printed circuit boards, in particular to a method for leaching copper from waste printed circuit boards with mixed bacteria. Background technique [0003] With the rapid development of information technology, the output of Waste Electric and Electronic Equipment (WEEE) continues to increase. As an important component of WEEE, waste printed circuit boards (PCBs) usually contain about 40% of metals, of which copper Is the main ingredient, 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 disp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B15/00C12N1/36C12N1/20C12R1/01
CPCY02P10/20
Inventor 梁国斌马飞蒋莉刘维平周全法
Owner YANGZHOU NINGDA NOBLE METAL CO LTD
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