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Method for extracting metal copper using microbe and its use

A technology for extracting metals and microorganisms, applied to the improvement of process efficiency, photography technology, instruments, etc., can solve the problems of waste, no recycling, etc., and achieve the effect of effective recovery, low cost, and pollution-free metal recovery rate

Inactive Publication Date: 2008-07-23
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These printed circuit boards contain a large amount of metallic copper, which is largely wasted as an important industrial raw material, but there is currently no effective method for recycling

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] (1) Pulverize the printed circuit board from which components have been removed into 40 mesh powder;

[0047] (2) Put the printed circuit board powder into the cultivated Thiobacillus ferrooxidans culture solution B1 by 10g / L;

[0048] The formula of culture medium B1 is:

[0049] (NH 4 ) 2 SO 4

KCl

K 2 HPO 4

MgSO 4 ·7H 2 o

Ca(NO 3 ) 2

FeSO 4 ·7H 2 o

h 2 o

Medium B1

3.0g

0.2g

0.5g

0.5g

0.01g

45.0g

1L

[0050] The pH of the culture medium B1 is 2.0, with H 2 SO 4 adjust.

[0051] The concentration of Thiobacillus ferrooxidans in culture medium B1 containing Thiobacillus ferrooxidans reaches 10 7 Individuals / mL order of magnitude or more.

[0052] (3) The mixing method of stirring and aeration is used for leaching for 15 days, and the leaching efficiency can reach 100%;

[0053] (4) Separating the leached solid and liquid, taking the leachate, and carry...

Embodiment 2

[0057] (1) Pulverize the printed circuit board from which components have been removed into 80-mesh powder;

[0058] (2) Putting the printed circuit board powder into the cultivated microspiral culture medium B2 containing ferrous oxide by 20g / L;

[0059] The formula of culture medium B2 is:

[0060] (NH 4 ) 2 SO 4

KCl

K 2 HPO 4

MgSO 4 ·7H 2 o

Ca(NO 3 ) 2

FeSO 4 ·7H 2 o

h 2 o

Medium B2

0.2g

0.1g

0.1g

0.5g

0.01g

10g

1L

[0061] The pH of the culture medium B2 is 2.5, with H 2 SO 4 adjust.

[0062] The ferrous oxidative microspiral concentration in the cultivated ferrous oxidative microspiral culture solution reached 10 8 Individuals / mL order of magnitude or more.

[0063] (3) The mixing method of stirring and aeration is used for leaching for 20 days, and the leaching efficiency can reach 98%;

[0064] (4) Separating the leached solid and liquid, taking the l...

Embodiment 3

[0068] (1) The printed circuit board with the components removed is broken into 80 mesh powder;

[0069] (2) Putting the printed circuit board powder into the cultivated Thiobacillus ferrooxidans culture medium B2 by 50g / L;

[0070] The formula of culture medium B2 is:

[0071] (NH 4 ) 2 SO 4

KCl

K 2 HPO 4

MgSO 4 ·7H 2 o

Ca(NO 3 ) 2

FeSO 4 ·7H 2 o

h 2 o

Medium B2

0.15g

0.05g

0.05g

1.0g

0.1g

25g

1L

[0072] The pH of the culture medium B2 is 1.5, with H 2 SO 4 adjust.

[0073] The concentration of Thiobacillus ferrooxidans in the cultivated culture solution containing Thiobacillus ferrooxidans reaches 10 7 Individuals / mL order of magnitude or more.

[0074] (3) The mixing method of stirring and aeration is used for leaching for 30 days, and the leaching efficiency can reach 97%;

[0075] (4) Separating the leached solid and liquid, taking the leachate, and ca...

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PUM

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Abstract

The present invention discloses microbe extracting method of metal copper and its application. The method includes crushing copper connecting material into powder; soaking the powder in culture liquid containing microbe to leach out for 15-60 days; solid-liquid separating to obtain leach solution and extracting with copper extractant; reverse extracting copper from the copper extracting liquid with reverse extractant; and final electrolyzing the copper containing reverse extracting liquid to obtain metal copper. The said method may be used in extracting metal copper from printed circuit board. The method has high economic benefit and environment benefit.

Description

technical field [0001] The invention belongs to microbial hydrometallurgy technology, and relates to a method for extracting metallic steel by using microorganisms, and also relates to the application of the method in extracting metallic copper of printed circuit boards. Background technique [0002] Bacterial metallurgy, also known as microbial leaching, is a new technology in the modern hydrometallurgical industry. It is mainly a metallurgical method that uses bacterial method to dissolve lean ore, waste ore, tailings and Daye slag to recover some precious non-ferrous metals and rare metals, so as to prevent the loss of mineral resources and maximize the use of ore deposits. [0003] Bacterial metallurgy began in 1974, when American scientists Colmer and Hinkle isolated a strain of Ferrooxidans (Thiobacillus ferrooxidans) from acidic mine water. Since then, Brino and others in the United States have isolated Thiobacillus thiooxidans (T.thiooxidans) and Thiobacillus ferroo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/18C22B3/04C22B3/26C25C1/12
CPCY02P10/234Y02P10/236Y02P10/20
Inventor 郑正周培国王艳锦彭晓成唐登勇帖靖玺罗兴章张继彪李继红李培培李军状孟卓
Owner NANJING UNIV
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