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Method for extracting copper out of waste printed circuit board by employing mixed bacteria

A technology of printed circuit boards and mixed bacteria, applied in the direction of microorganism-based methods, methods using microorganisms, biochemical equipment and methods, etc., can solve the problems of copper leaching ability decline, achieve copper leaching rate improvement, improve resistance Copper property, energy saving effect

Active Publication Date: 2015-06-24
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 extracting copper out of waste printed circuit board by employing mixed bacteria
  • Method for extracting copper out of waste printed circuit board by employing mixed bacteria
  • Method for extracting copper out of waste printed circuit board by employing mixed bacteria

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1）

[0029] The method for leaching copper in waste printed circuit boards by mixed bacteria of the present embodiment includes the following steps:

[0030] ①Pretreatment of waste printed circuit boards. Crush and grind the waste printed circuit board PCBs with electronic components removed into powder, and the ground waste PCBs powder passes through 100 μm to 200 μm sieve holes (in this example, the ground waste printed circuit board powder passes through 100 μm sieve holes) , to collect the waste PCBs powder passing through the sieve hole for disposal.

[0031] After the waste PCBs treated in this example were ground and sieved, the main metal content was analyzed.

[0032] The main metal contents are 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) Thiobacillus acidophilus ferrooxidans ( A. ferrooxidans ) domestication. It is obtained by enriching and culturing...

Embodiment 2 to Embodiment 6）

[0065] The method for leaching copper in the waste printed circuit board from the mixed bacteria of Example 2 to Example 6 is the same as in Example 1, and the difference is: step 3. the content of each component in the mixed bacteria culture solution used in the mixed bacteria culture As well as the addition time and addition amount of the 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 bacterial culture solution used in step ③ mixed bacterial culture

[0067]

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

[0069]

[0070] Note: The addition time described in the above table refers to the time when the powder is added after the start of the culture of the mixed bacteria in step ③; the added amount refers to the weight of the waste printed circuit board powder added per 1L of the mixed bacteria culture system , in 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 for an invention patent application with an application number of 201310457250.3, an application date of September 30, 2013, and an invention-creation title of "Method for Leaching Copper from Waste Printed Circuit Boards with Mixed Bacteria". technical field [0002] 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 with mixed bacteria. Background technique [0003] With the rapid development of information technology, the output of electronic waste (Waste Electric and Electronic equipment, WEEE) continues to rise. As an important component of WEEE, waste printed circuit boards (Printed Circuit Boards, PCBs) usually contain about 40% of metals, of which metal Copper is the main component, and the content is as high as 20% to 30%. It is estimated that my country needs to process more than 500,000 tons of PCBs...

Claims

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Application Information

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Patent Type & Authority Applications(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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