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Comprehensive resources treatment method of waste circuit board

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

Inactive Publication Date: 2007-04-18
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
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Effect test

example 1

[0047] 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 amount of O added, after several times of transfer and domestication, enables the leaching Thiobacillus ferrooxidans to adapt to the culture environment containing high concentrations of Cu ions, and its tolerance level reaches 6-8g Cu. 2+ / L.

[0048] 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 ions in...

example 2

[0057] 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.

[0058] 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, 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 solution ...

example 3

[0067] 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 dosage of O, after several times of transfer and acclimatization, enables the leaching Microspirilla ferrooxidans to adapt to the culture environment containing high concentrations of Cu ions, and its tolerance level reaches 12-15g Cu ions. 2+ L.

[0068] 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 ...

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Abstract

The invention relates to a method to extract copper from abandoned breadboards and to use remain substance comprehensively recycling by combining techniques of microbe, metallurgy and materials. Based on principles of microbial wet-process metallurgy, Cu is extracted from abandoned breadboards by using iron protoxide thiobacillus. At the same time, the retained solid is recycled to realize the comprehensive treatment of abandoned breadboards. The entire recycled treatment of abandoned breadboards is realized, which guarantees the entirely clean produce without discharging waste water, waster residue and waste gas into the environment. This method has much strongpoint including little investment, low cost, high recovery rate of metal, non-pollution and green zoology etc. It benefits the society, economy and environment.

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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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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