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Comprehensive resources treatment method of waste circuit board

A technology of discarded circuit boards and comprehensive resources, applied in the direction of sustainable waste treatment, solid waste management, electronic waste recycling, etc., can solve the problems of large investment, toxicity, and harmfulness, and achieve high metal recovery rate, low investment, and low cost Effect

Inactive Publication Date: 2009-07-08
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, some of these treatment methods have large investment and are prone to produce toxic and harmful wastes during operation.
Moreover, metals are usually recycled, and other residues are directly landfilled or incinerated, so that the resources contained in the discarded circuit boards cannot be fully utilized.

Method used

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  • Comprehensive resources treatment method of waste circuit board

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0048] a. Acclimatize the Thiobacillus ferrooxidans used in leaching waste circuit board metal Cu, add CuSO in the 9K liquid culture medium (that is, the substratum prepared with the formula in the present invention) of inoculating Thiobacillus ferrooxidans 4 ·5H 2 O, when the solution changes from blue-green to dark green, re-inoculate the domesticated Thiobacillus ferrooxidans and increase CuSO 4 ·5H 2 The dosage of O, after several times of transfer and acclimation culture, enables the leaching Thiobacillus ferrooxidans to adapt to the culture environment containing high concentration of Cu ions, and its tolerance level reaches 6-8g Cu ions. 2+ / L.

[0049] b. Inoculate the Thiobacillus ferrooxidans liquid through domestication in the 1# container (volume is 4L) that fills 9K culture medium solution, inoculum size is 10% (volume ratio), and solution is stirred, stirring speed is 100r / min, cultured for 2 days, at this time the solution turned reddish brown. The iron ion...

example 2

[0058] a. Acclimatize Thiobacillus ferrooxidans for leaching metal Cu in waste circuit boards, add CuSO to the 9K liquid medium inoculated with Thiobacillus ferrooxidans 4 ·5H 2 O, when the solution changes from blue-green to dark green, re-inoculate the domesticated Thiobacillus ferrooxidans, and increase the dosage of CuSO4·5H2O. It can adapt to the culture environment containing high concentration of Cu ions, and its tolerance can reach 10-13g Cu 2+ / L.

[0059] b. Inoculate the Thiobacillus ferrooxidans liquid through domestication in the 1# container (volume is 4L) that fills 9K culture medium solution, inoculum size is 14% (volume ratio), and solution is stirred, and stirring speed is 80r / min, cultured for 1 day, at this time the solution turned reddish brown. The iron ions in the solution are basically Fe 3+ The amount of microorganisms in the bacterial solution measured by the lipophosphorus method is 8n mol P / mL, and the oxidation-reduction potential of the solut...

example 3

[0068] a. acclimation and leaching the Microspirillum ferrooxidans used for metal Cu in the discarded circuit board, adding CuSO in the 9K liquid medium (that is, the medium prepared with the formula in the present invention) of Microspirillum ferrous oxides inoculated 4 ·5H 2 O, when the solution changes from blue-green to dark green, re-inoculate the domesticated Microspirillum ferrooxidans, and increase CuSO 4 ·5H 2 The amount of O added, after several times of transfer and domestication, made the leaching Microspirilla ferrooxidans adapt to the culture environment containing high concentrations of Cu ions, and its tolerance reached 12-15g Cu ions. 2+ / L.

[0069] B. fill the 1# container (volume is 4L) of 9K substratum solution inoculation through domesticated Microspiral ferrooxidans bacterium liquid, inoculum size is 5% (volume ratio), and solution is stirred, stirring speed is 120r / min, cultured for 3 days, at this time the solution turned reddish brown. The iron io...

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Abstract

The invention relates to a method that combines microbial, metallurgical, material and other technologies to extract metallic copper from waste circuit boards and comprehensively utilize other remaining materials. This invention draws on the principles of microbial hydrometallurgy, uses Thiobacillus ferrooxidans and the like to leaching and recovering the metallic Cu in the waste circuit boards, and at the same time recycles the residual solids after leaching the Cu, achieving a completely comprehensive resource utilization of the waste circuit boards. deal with. This method realizes full resource treatment of waste circuit boards, does not discharge waste water, waste residue or waste gas to the environment, realizes clean production in the whole process, has the characteristics of low investment, low cost, high metal recovery rate, no pollution, green ecology, etc. Advantages: It has good social, economic and environmental benefits.

Description

technical field [0001] The invention belongs to waste resource treatment technology, and relates to a method for extracting metal copper from waste circuit boards by combining technologies such as microorganisms, metallurgy, and materials, and comprehensively reusing other remaining materials. Background technique [0002] Microbial hydrometallurgy is a method of leaching metals from ores or recovering (removing) metals from water by using certain microorganisms or their metabolites to oxidize, reduce, dissolve, absorb (adsorb) minerals and elements, etc. . [0003] Use microbial leaching and oxidation to leach lean ore, waste ore, tailings and Daye slag containing dozens of precious and rare metals such as copper, gold, silver, manganese, nickel, chromium, etc., to prevent the loss of mineral resources . [0004] In 1955, S.R.Zimmerley, D.G.Wilson and J.D.Prater applied for the patent of bioheap leaching for the first time, and entrusted this technology to Kennecott Coppe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B3/18C22B3/26C25C1/12C12N1/20C04B18/14B09B3/00
CPCY02P10/20Y02W30/82Y02W30/91
Inventor 郑正彭晓成周培国罗兴章陈洁王艳锦赵国华聂耳帖靖玺张继彪钟云宋金伟李军状李培培孟卓
Owner NANJING UNIV
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