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A method for recycling copper and gold in electronic waste by using Phanerochaete chrysosporium

A technology of Phanerochaete and electronic waste, applied in the field of hydrometallurgy, which can solve the problems of long biological treatment process, difficulty in transformation and connection of different systems, and achieve the effect of solving easy-to-contaminate bacteria and reducing acid corrosion hazards

Active Publication Date: 2020-06-30
SHANGHAI SECOND POLYTECHNIC UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method overcomes the problems of long two-stage or multi-stage biological treatment process and the difficulty in conversion and connection of different systems, and realizes the simultaneous recovery of basic metals and precious metals

Method used

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  • A method for recycling copper and gold in electronic waste by using Phanerochaete chrysosporium
  • A method for recycling copper and gold in electronic waste by using Phanerochaete chrysosporium
  • A method for recycling copper and gold in electronic waste by using Phanerochaete chrysosporium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] In this example, waste mobile phone printed circuit boards are processed. The content of the main metal elements is shown in Table 1. The particle size analysis after crushing and sorting shows that the particle size is less than or equal to 3mm and accounts for about 83.69%.

[0031] Table 1 Contents of main metal elements in waste mobile phone printed circuit boards in Example 1

[0032]

[0033] Will P. chrysosporium (U.S.A NDM3-2) was inoculated into sterilized nitrogen-limited medium, and the inoculum size was 1×10 5 spores / ml, shake culture for 3 days at a culture temperature of 30° C. and a shaker speed of 120 rpm, and the fungus forms dense mycelial balls.

[0034] Add 2.50L of sterilized nitrogen-limited medium and 150g of waste mobile phone printed circuit board powder into a bio-oxidation constant temperature stirrer, and then inoculate 0.50L of the fungal liquid cultured in step (1) into the above-mentioned stirrer, the inoculation amount It is 16.67% o...

Embodiment 2

[0036] In this example, waste computer printed circuit boards are processed, and the content of the main metal elements is shown in Table 2. The particle size analysis after crushing and sorting shows that the particle size is less than or equal to 3mm, accounting for about 86.40%.

[0037] Table 2 The content of metal elements in waste computer printed circuit boards in Example 2

[0038]

[0039] Will P. chrysosporium (U.S.A NDM3-2) was inoculated into sterilized nitrogen-limited medium, and the inoculum size was 3×10 5 spores / ml, shake culture for 4 days at a culture temperature of 35° C. and a shaker speed of 150 rpm, and the fungus forms dense mycelial balls.

[0040] Add 2.50L of sterilized nitrogen-limiting medium and 275g of waste computer printed circuit board powder into a bio-oxidation constant temperature stirrer, then inoculate 0.28L of the fungal liquid cultured in step (1) into the above-mentioned stirrer, the inoculation amount 10% of the volume of the nit...

Embodiment 3

[0042] In this example, waste TV printed circuit boards are processed, and the content of the main metal elements is shown in Table 3. The particle size analysis after crushing and sorting shows that the particle size is less than or equal to 3mm, accounting for about 89.24%.

[0043] Table 3 Contents of metal elements in waste TV printed circuit boards in Example 3

[0044]

[0045] Will P. chrysosporium (U.S.A NDM3-2) was inoculated into sterilized nitrogen-limited medium, and the inoculum size was 5×10 5 spores / ml, the fungus forms dense mycelial balls under the conditions of a culture temperature of 40° C. and a shaker rotation speed of 180 rpm for 5 days.

[0046] Add 2.50L of sterilized nitrogen-limiting medium and 450g of waste TV printed circuit board powder into the bio-oxidation constant temperature stirrer, then inoculate 0.625L of the fungal liquid cultured in step (1) into the above-mentioned stirrer, the inoculum amount 20% of the volume of the nitrogen-limi...

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Abstract

The invention belongs to the technical field of hydrometallurgy, and particularly relates to a method for recycling copper and gold in electronic wastes by utilizing P.chrysosporium. The method comprises the following procedures of firstly, carrying out self-immobilization culture on P.chrysosporium; adding an obtained bacterial ball, a sterilized potato dextrose agar (PDA) nitrogen-limited liquidculture medium and an electronic waste powder into a biological oxidation constant-temperature stirrer, and carrying out non-sterilization leaching for 5-15 days; and finally, respectively carrying out an extracting-reverse extracting-electrowinning method and an active carbon adsorption method to recovery the copper and the gold in a microorganism leaching solution. The method has the advantagesthat after the P.chrysosporium treatment, the leaching rates of the copper in a wasted printed substrate are 84.67%, 81.35% and 78.04%, the leaching rates of the gold in the wasted printed substrateare 28.79%, 24.36% and 35.87% respectively, and the simultaneous recovery of basic metals and precious metals are achieved.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy, in particular to a method for recovering copper and gold in electronic waste by using Phanerochaete chrysosporium. Background technique [0002] Electronic waste refers to the waste electronic and electrical products generated in the process of production and consumption, which contain a large amount of metals with recycling value. The accelerated updating of electronic products has led to a large amount of electronic waste, which is expected to reach 52.2 million tons in 2021. As a support for other electronic components, printed circuit boards are an essential component of electronic products. my country needs to process up to 500,000 tons of waste printed circuit boards every year, of which the metal content and gold content are 150,000 to 200,000 tons and 150 tons, respectively. Waste printed circuit boards are mainly composed of plastics, inert oxides and metals, and metals can be ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B15/00C22B3/18C12N1/14C12R1/645
CPCY02P10/20
Inventor 刘倩白建峰顾卫华王景伟周楠代双燕
Owner SHANGHAI SECOND POLYTECHNIC UNIVERSITY
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