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Method for leaching copper in waste printed circuit boards (PCBs) by mixed bacteria

A printed circuit board and mixed bacteria technology, which is applied in the field of copper recovery from waste printed circuit boards, can solve problems such as the decline of copper leaching ability, and achieve the effects of improving copper leaching rate, promoting leaching, and simple process

Active Publication Date: 2015-04-08
YANGZHOU NINGDA NOBLE METAL CO LTD
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  • Summary
  • 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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  • Method for leaching copper in waste printed circuit boards (PCBs) by mixed bacteria
  • Method for leaching copper in waste printed circuit boards (PCBs) by mixed bacteria
  • Method for leaching copper in waste printed circuit boards (PCBs) by mixed bacteria

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Embodiment 1）

[0028] The method for the mixed bacteria of the present embodiment to extract copper in waste printed circuit boards may further comprise the steps:

[0029] 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.

[0030] After the discarded PCBs processed in this embodiment were ground and sieved, their main metal content was analyzed.

[0031] The main metal content is shown in Table 1 below:

[0032] Table 1 Main metal content in waste printed circuit board powder

[0033]

[0034] ② domestication of strains.

[0035] (1) Acidophilus Thiobacillus ferrooxidans ( A. ferrooxidans ) of domes...

Embodiment 2 to Embodiment 6）

[0064] 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.

[0065] Table 2 The content of each component in the mixed bacteria culture solution used in step ③ mixed bacteria culture

[0066]

[0067] Table 3 Addition time and amount of waste printed circuit board powder in step ④

[0068]

[0069] 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 leaching copper in waste PCBs by mixed bacteria. The waste PCBs are preprocessed for standby use; acidithiobacillus ferrooxidans and acidithiobacillus thiooxidans are subjected to copper-resistant acclimation and culture respectively, and are mixed and cultured in a mixed bacteria culture solution; when the culture time reaches 40h-55h, powder of the PCBs is started to be added; then powder of the PCBs is added in additional dosage point by point at other time points; and bioleaching is performed. According to the method, when the mixed bacteria are cultured, the PH value of the culture solution is not required to be adjusted, two types of bacteria can grow in balance; at the same time, when the two types of bacteria grow, a large amount of sulfuric acid and Fe 3+ are generated and used for leaching copper in the powder of the waste PCBs in a later period; and in the whole process, the efficiency is high, and the energy is saved. A manner of low front, high rear and multipoint addition is adopted; and on the basis that the additive amount of the powder of the waste PCBs is increased, the copper leaching efficiency is improved remarkably, however, the bacteria growth inhibition degree is relatively small.

Description

technical field [0001] 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 [0002] 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 metals 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 p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C12N1/20C22B7/00C22B15/00C12R1/01
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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