Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for leaching copper from waste printed circuit boards by Thiobacillus ferrooxidans

A technology of Thiobacillus ferrooxidans and printed circuit boards, which is applied in the field of copper recovery from waste printed circuit boards, and can solve the problems of long leaching time, no consideration of bacterial growth, copper leaching rate, and low leaching rate. , to achieve the effect of shortening the leaching time

Active Publication Date: 2017-11-24
YANGZHOU NINGDA NOBLE METAL CO LTD
View PDF9 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The above-mentioned method of using Thiobacillus ferrooxidans to leach copper in waste gas printed circuit boards does not consider the growth of bacteria and the leaching rate of copper during leaching, so the leaching rate is low and the leaching time is long

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for leaching copper from waste printed circuit boards by Thiobacillus ferrooxidans

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1）

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

[0025] ① Pretreatment of waste printed circuit boards. Remove the electronic components from the waste printed circuit board PCBs from an electronics factory in Changzhou, then crush and grind them into powder, and pass the ground waste PCBs powder through a sieve hole 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 powder that passes through the sieve is collected for processing.

[0026] After the discarded PCBs processed in this embodiment were ground and sieved, their main metal content was 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 from the a...

Embodiment 2）

[0051] The rest of the method for leaching copper in waste printed circuit boards by Thiobacillus ferrooxidans in this embodiment is the same as in Example 1, except that step ④ adds step ① to the strain culture system that has been cultivated in step ③ for 64 hours. When processing the waste PCBs powder obtained, the amount of PCBs powder added is 20g / L; after adding PCBs powder A. ferrooxidans The leaching reaction ended when the culture was continued for 120 hours; after the leaching reaction, the leaching rate of copper in discarded PCBs was determined to be 88.6%.

Embodiment 3）

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

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 indi...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com