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A kind of method utilizing aspergillus niger bioleaching indium in waste liquid crystal display

A liquid crystal display and biological leaching technology, applied in the direction of improving process efficiency, etc., can solve the problems of leaching that have not yet been solved, and achieve the effects of reducing recycling costs, small secondary pollution, and mild treatment conditions

Active Publication Date: 2020-08-18
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Aspergillus niger, another functional strain that can produce organic acids, has not yet been reported to leach indium from waste liquid crystal display screens

Method used

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  • A kind of method utilizing aspergillus niger bioleaching indium in waste liquid crystal display
  • A kind of method utilizing aspergillus niger bioleaching indium in waste liquid crystal display
  • A kind of method utilizing aspergillus niger bioleaching indium in waste liquid crystal display

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Example 1 One-step bioleaching

[0041] A method for biologically leaching indium from waste liquid crystal displays by Aspergillus niger:

[0042] 1. Disassemble the waste liquid crystal display, take out the liquid crystal screen, remove the polarizer and liquid crystal with acetone, and separate the ITO glass substrate.

[0043] 2. Then mechanically crush the ITO glass substrate to make a powder sample with an average particle size of 75μm;

[0044] 3. Configure 5 groups of 100mL sucrose fermentation medium, the medium components include: sucrose (50g / L), NaNO 3 (1.5g / L), KH 2 PO 4 (0.5g / L), MgSO 4 ·7H 2 O (0.025g / L), KCl (0.025g / L), yeast extract (1.6g / L);

[0045] 4. Adjust the initial pH of the sucrose fermentation medium configured in step 3 to 4.0 with 1M hydrochloric acid;

[0046] 5. Set the inoculation amount to 1% (v / v) concentration to 3×10 7 A / mL Aspergillus niger spore suspension is added to the 5 groups of sucrose fermentation medium configured in step (4), immedia...

Embodiment 2

[0049] Example 2 Two-step biological leaching

[0050] A method for biologically leaching indium from waste liquid crystal displays by Aspergillus niger:

[0051] 1. Disassemble the waste LCD, take out the LCD screen, remove the polarizer and liquid crystal with acetone, and separate the ITO glass substrate;

[0052] 2. Mechanically crush the ITO glass substrate to prepare a powder sample with an average particle size of 75μm;

[0053] 3. Configure 5 groups of 100mL sucrose fermentation medium, the medium components include: sucrose (50g / L), NaNO 3 (1.5g / L), KH 2 PO 4 (0.5g / L), MgSO 4 ·7H 2 O (0.025g / L), KCl (0.025g / L), yeast extract (1.6g / L);

[0054] 4. Adjust the initial pH of the sucrose fermentation medium configured in step 3 to 4.0 with 1M hydrochloric acid;

[0055] 5. Set the inoculation amount to 1% (v / v) concentration to 3×10 7 A / mL Aspergillus niger spore suspension was added to the 5 groups of sucrose fermentation medium in step (4), cultured for 3 days at a temperature of 3...

Embodiment 3

[0058] Example 3 Bioleaching of fermentation broth

[0059] A method for biologically leaching indium from waste liquid crystal displays by Aspergillus niger:

[0060] 1. Disassemble the waste LCD, take out the LCD screen, remove the polarizer and liquid crystal with acetone, and separate the ITO glass substrate.

[0061] 2. Mechanically crush the ITO glass substrate to prepare a powder sample with an average particle size of 75μm.

[0062] 3. Configure 5 groups of 100mL sucrose fermentation medium, the medium components include: sucrose (50g / L), NaNO 3 (1.5g / L), KH 2 PO 4 (0.5g / L), MgSO 4 ·7H 2 O (0.025g / L), KCl (0.025g / L), yeast extract (1.6g / L).

[0063] 4. Adjust the initial pH of the sucrose fermentation medium to 4.0 with 1M hydrochloric acid.

[0064] 5. Set the inoculation amount to 1% (v / v) concentration to 3×10 7 A / mL Aspergillus niger spore suspension was added to the 5 groups of sucrose fermentation medium in step (4), and the temperature was 30°C and the shaking speed was 12...

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Abstract

The invention belongs to the technical field of waste liquid crystal display resource recovery, and particularly discloses a method for utilizing aspergillus niger to bioleaching indium in a waste liquid crystal display. The method comprises three ways that one-step bioleaching, specifically, after the formation of aspergillus niger fermentation system, then a powder sample is added, and fermentation cultivation at the same time indium in the powder sample is leached; two-step bioleaching, specifically, aspergillus niger spore suspension is added to fermentation medium for pre-cultivation, andafter aspergillus niger filament is grown, the powder sample is added to the obtained fermentation liquid, and indium in a powder sample is leached at the same time of fermentation cultivation; fermentation liquid bioleaching, specifically, aspergillus niger spore suspension liquid is added to the fermentation medium for pre-cultivation, after aspergillus niger filament is grown, the aspergillusniger filament is separated, the fermentation liquid is collected, and a powder sample is added to leach indium in the powder sample. The method has the advantages of low recovery cost, simple operation, mild treatment conditions, small secondary pollution, and the like.

Description

Technical field [0001] The invention belongs to the technical field of waste liquid crystal display resource recovery, and particularly relates to a method for biologically leaching indium from waste liquid crystal displays by using Aspergillus niger. Background technique [0002] At present, there are many recycling methods for indium in waste liquid crystal displays, but there are still a lot of problems to be solved urgently. For example: using high-concentration inorganic acids, such as hydrochloric acid, sulfuric acid, nitric acid, etc., to leaching indium to produce a lot of waste acid. The use of chlorides such as PVC and ammonium chloride to convert indium oxide into indium chloride will cause harmful smoke and dust emissions. It is necessary to strictly seal the equipment and do exhaust gas treatment. The vacuum carbon high temperature reduction method requires complex equipment to form elemental indium, high temperature and high pressure energy consumption, and high te...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B3/18C22B58/00
CPCC22B3/18C22B7/006C22B58/00Y02P10/20
Inventor 朱能武崔佳莹李遥毛扶林吴平霄
Owner SOUTH CHINA UNIV OF TECH
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