CN102206751B - Method for continuously recovering copper from printed circuit boards by microbial metabolites under action of micro electric field - Google Patents
Method for continuously recovering copper from printed circuit boards by microbial metabolites under action of micro electric field Download PDFInfo
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- CN102206751B CN102206751B CN2011101101523A CN201110110152A CN102206751B CN 102206751 B CN102206751 B CN 102206751B CN 2011101101523 A CN2011101101523 A CN 2011101101523A CN 201110110152 A CN201110110152 A CN 201110110152A CN 102206751 B CN102206751 B CN 102206751B
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- microbial metabolites
- copper
- electric microfield
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention relates to a method for treating waste printed circuit boards (PCB), in particular to a method for continuously recovering copper from circuit boards by microbial metabolites under the action of a micro electric field. The method comprises the following steps of: (1) acquiring acidophilic bacteria; (2) performing scale-up culture on the acidophilic bacteria in a 9K culture medium toobtain bacterial liquid; (3) crushing the waste PCBs; (4) adding printed circuit board powder into a microbe reactor containing the bacterial liquid; (5) applying a 10-20mA micro electric field to the microbe reactor; (6) recovering metals on negative poles; and (7) recovering the residual non-metals. The method has all advantages of microbiohydrometallurgy, and the concentration of heavy metal ions in a microbe living system can be changed, so that the bioreaction can be continuously performed; therefore, the whole process flow is shortened, the cost is saved, sewage and waste gas are avoided, and the microbiological leaching efficiency is improved.
Description
Technical field:
The present invention relates to the method for a kind of processing old circuit board (PCB), the method for copper in the continuous recovery train plate of microbial metabolites under especially a kind of electric microfield effect.
Background technology:
The method of handling PCB at present has a lot, generally is divided into following a few class: pyrometallurgy, hydrometallurgy, mechanical treatment process, microbial method.
Pyrometallurgy and hydrometallurgy are mainly used in the recovery of precious metals such as gold and silver, and its technology is simple, but the cost height, secondary pollution is serious, and is particularly impracticable to the recovery of plain metal.Though mechanical sorting technology is more more complex than pyrometallurgy and hydrometallurgy, its secondary pollution is little, therefore, the comprehensive utilization of various metals in the abandoned printed circuit board is had higher use value.But, because the prerequisite of mechanical sorting is the separated necessary monomer dissociation of material, the method that reaches monomer dissociation is normally broken, in abandoned printed circuit board metal and nonmetal between combine by technology such as film, by suitable equipment and breaking method, can make metal and nonmetal monomer dissociation.But wherein be that mode with alloy, coating or welding combines between the various metals, be difficult to make the metal monomer dissociation with Mechanical Crushing, so the mechanical sorting method should be used with other method as supplementary means.The microorganism hydrometallurgy not only have pollution less, working conditions gentleness, advantages such as flow process is short, cost is low, less investment, and have the wide characteristics of mineral suitability in the application of mining metallurgical engineering, in the middle of the recovery in the unmanageable complicated ore of conventional art, low taste table Tu Kuang, discarded ore deposit etc., have special advantages.But existing can not processed continuously deadly defect, generally adopts one-part form and two-section type facture.It is a collection of to cultivate a batch processing.
Summary of the invention:
In order to solve the problems of the technologies described above, the invention provides under a kind of electric microfield effect the method for copper in the continuous recovery train plate of microbial metabolites
The technical solution adopted for the present invention to solve the technical problems is: the method for copper in the continuous recovery train plate of microbial metabolites under a kind of electric microfield effect, and it adopts following steps to finish:
(1) obtains acidophilic bacteria;
(2) acidophilic bacteria amplification culture in the 9K substratum is made bacterium liquid;
(3) break process old circuit board;
(4) fragmentation is good wiring board powder joins in the microorganism reactor that contains bacterium liquid;
(5) in microorganism reactor, add the 10-20mA electric microfield;
(6) metal on the recovery negative electrode;
(7) reclaim the nonmetal of remainder.
The present invention not only can inherit whole advantages of microorganism hydrometallurgy, and can change concentration of heavy metal ion in the microorganism life system, makes microbial reaction can continue to carry out, thereby shortens whole process flow, saves cost, avoids producing sewage and waste gas.Improve the microorganism leaching efficiency.
Description of drawings:
Fig. 1 is process flow sheet of the present invention.
Fig. 2 is the comparison diagram of the metabolic activity under the present invention and the methods such as one-part form and two-section type.
Fig. 3 compares for the leaching yield under the present invention and the methods such as one-part form and two-section type.
Embodiment:
The present invention is further described below in conjunction with drawings and Examples.
The method (in conjunction with shown in Figure 1) of copper in the continuous recovery train plate of microbial metabolites under a kind of electric microfield effect, what its principle adopted is to install some microelectrodes additional in the inside of microorganism reactor, makes it to produce some electric microfields unit.Under certain strength of electric field, promote microbial growth, and the heavy metal ion electrolysis in the reaction system is adsorbed on the negative electrode.Heavy metal content in the reduction system prevents that microorganism is suppressed by heavy metal, has collected metal on negative electrode again, kills two birds with one stone.This kind method is different from common two-part and soaks the ore deposit method, and it has added electric microfield at the key position that reclaims, and provides additional energy to system, promotes microbial metabolism, also improves the leaching rate of metal among the PCB simultaneously.
Should be under the electric microfield effect method of copper in the continuous recovery train plate of microbial metabolites, its concrete steps are:
(1) obtain acidophilic bacteria:
The used bacterial classification of the present invention is thiobacillus ferrooxidant (Thiobacillus ferrooxidans, the T.f bacterium), the strain separating source is the active sludge that contains the meta-bolites of organism, inorganics, microorganism and microorganism, get mud 50ml and be seeded to the 9K substratum, 120r/min, 25-30 ℃, 4-7 days, shift repeatedly again 8 times, eliminate assorted bacterium, purifying bacterial classification by the acidity of substratum.After purified, cultivate with the coating of 9K solid medium, choose mono-clonal.Strain isolated carries out the comparative analysis of 16S rDNA sequence, determines bacterial classification.
(2) acidophilic bacteria amplification culture in the 9K substratum, make bacterium liquid:
The inoculative proportion of thiobacillus ferrooxidant (Thiobacillus ferrooxidans, T.f bacterium) according to 10% is inoculated into the 9K liquid nutrient medium, and constant temperature 25-30 ℃, pH2.13, rotating speed 120r/min were cultivated 4-5 days, and microscopy nectar degree is 6.8 * 10
7/ ml.
(3) break process old circuit board:
At first craft or Mechanical Crushing wiring board screen with 45 order national standard analyses sieve after high speed disintegrator is pulverized again.Get undersized product, dried 1 hour for 105 ℃.Hit the crushed products that obtains diameter 0.2mm-0.28mm after the formula riddler is handled with 60 orders and 75 order national standard analyses sieve and top again.
(4) fragmentation is good PCB powder joins in the microorganism reactor that contains bacterium liquid:
The PCB powder of fragmentation is joined in the microorganism reactor that contains bacterium liquid, and adding concentration is 30g/L.25-30 ℃ is at the uniform velocity stirred 120r/min.
(5) in microorganism reactor, add the 10-20mA electric microfield;
(6) metal on the recovery negative electrode;
(7) reclaim the nonmetal of remainder.
Reaction in above-mentioned steps (4), (5) is as follows:
Thiobacillus ferrooxidant is under acidic conditions, with Fe
2+Be the energy, with CO in the air
2Be carbon source for growth, with Fe
2+Be oxidized to Fe
3+
2Fe
3++Cu
0→2Fe
2++Cu
2+
Fe
3+Oxidized metal copper (Cu
0), generate Cu
2+And Fe
2+
In microorganism reactor, apply the 10-20mA electric current, effectively promote the microbial growth metabolism.Cu in the reduction system
2Concentration,
Cu
2++2e
-→Cu
0
Leach 3-5 days Cu leaching yields and reach 99%.
In aforesaid method, its bacterium liquid reusable edible is so need not each new bacterium liquid of all cultivating in addition again simultaneously.
Do the contrast experiment by the present invention and two step lixiviation process, shown in Fig. 2,3, it is much the same that the result is presented in initial 2 hours leaching effect, and leaching yield significantly promotes after 3 hours.And after 1 day Cu of the present invention
2+Concentration has not changed substantially.And the Cu of two step of control group lixiviation process
2+Concentration continues to raise.And the Cu quality on the negative electrode of the present invention continues to increase.
Claims (5)
1. the method for copper in the continuous recovery train plate of microbial metabolites under the electric microfield effect, it is characterized in that: described method adopts following steps to finish:
(1) obtains thiobacillus ferrooxidant;
(2) thiobacillus ferrooxidant amplification culture in the 9K substratum is made bacterium liquid;
(3) break process old circuit board;
(4) fragmentation is good wiring board powder joins in the microorganism reactor that contains bacterium liquid;
(5) in microorganism reactor, add the 10-20mA electric microfield;
(6) metal on the recovery negative electrode;
(7) reclaim the nonmetal of remainder.
2. the method for copper in the continuous recovery train plate of microbial metabolites under the electric microfield effect according to claim 1, it is characterized in that: obtain thiobacillus ferrooxidant in the described step (1) in the following way: the strain separating source is the active sludge that contains the meta-bolites of organism, inorganics, microorganism and microorganism, get mud 50ml and be seeded to the 9K substratum, 120r/min, 25-30 ℃, cultivated 4-7 days; Transfer repeatedly after 8 times, eliminate assorted bacterium, purifying bacterial classification by the acidity of substratum; After purified, cultivate with the coating of 9K solid medium, choose mono-clonal; Strain isolated carries out the comparative analysis of 16S rDNA sequence, determines bacterial classification.
3. the method for copper in the continuous recovery train plate of microbial metabolites under the electric microfield effect according to claim 1, it is characterized in that: described step (2) is finished in the following way: thiobacillus ferrooxidant is inoculated into the 9K liquid nutrient medium according to 10% inoculative proportion, constant temperature 25-30 ℃, pH2.13, rotating speed 120r/min were cultivated 4-5 days, and microscopy nectar degree is 6.8 * 10
7/ ml.
4. the method for copper in the continuous recovery train plate of microbial metabolites under the electric microfield effect according to claim 1, it is characterized in that: in described step (4), it is 30g/L that the wiring board powder accounts for bacterial concentration.
5. the method for copper in the continuous recovery train plate of microbial metabolites under the electric microfield effect according to claim 1, it is characterized in that: the implementation condition of described step (4) is: at the uniform velocity stir 120r/min under 25-30 ℃.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011101101523A CN102206751B (en) | 2011-04-29 | 2011-04-29 | Method for continuously recovering copper from printed circuit boards by microbial metabolites under action of micro electric field |
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| CN2011101101523A CN102206751B (en) | 2011-04-29 | 2011-04-29 | Method for continuously recovering copper from printed circuit boards by microbial metabolites under action of micro electric field |
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| CN102206751B true CN102206751B (en) | 2013-10-02 |
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Families Citing this family (5)
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| CN104726714B (en) * | 2013-09-30 | 2017-06-16 | 江苏理工学院 | Method for leaching copper in waste printed circuit board by using mixed bacteria |
| CN103898550A (en) * | 2014-04-14 | 2014-07-02 | 常州纺织服装职业技术学院 | Recovery method of cupper in circuit board |
| CN113308605B (en) * | 2021-05-19 | 2022-11-22 | 上海第二工业大学 | Method for strengthening leaching of copper and gold in waste circuit board by phanerochaete chrysosporium by using micro-electric field |
| CN114107658A (en) * | 2021-11-12 | 2022-03-01 | 江苏科技大学 | Biological-chemical two-stage circulating reactor for pretreatment of refractory gold ores |
| CN114317998B (en) * | 2021-12-29 | 2023-07-04 | 上海第二工业大学 | Method for treating impurity metal in waste palladium-carbon catalyst by coupling micro-electric field with microorganism |
Citations (5)
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|---|---|---|---|---|
| CN1858276A (en) * | 2006-04-24 | 2006-11-08 | 南京大学 | Method for extracting metal copper using microbe and its use |
| CN1948524A (en) * | 2006-11-02 | 2007-04-18 | 南京大学 | Comprehensive resources treatment method of waste circuit board |
| CN101392327A (en) * | 2008-11-05 | 2009-03-25 | 东华大学 | Method for leaching copper in waste printed circuit board by microbiology |
| CN101748084A (en) * | 2008-12-17 | 2010-06-23 | 北京有色金属研究总院 | Normal temperature acidophilic leaching-ore bacteria and two-step leaching method for leaching metals in waste circuit board |
| CN101891166A (en) * | 2009-12-01 | 2010-11-24 | 西部矿业股份有限公司 | Method for leaching low-grade phosphorite with mixed bacillus of thiobacillus thioxidans and thiobacillus ferrooxidans |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1858276A (en) * | 2006-04-24 | 2006-11-08 | 南京大学 | Method for extracting metal copper using microbe and its use |
| CN1948524A (en) * | 2006-11-02 | 2007-04-18 | 南京大学 | Comprehensive resources treatment method of waste circuit board |
| CN101392327A (en) * | 2008-11-05 | 2009-03-25 | 东华大学 | Method for leaching copper in waste printed circuit board by microbiology |
| CN101748084A (en) * | 2008-12-17 | 2010-06-23 | 北京有色金属研究总院 | Normal temperature acidophilic leaching-ore bacteria and two-step leaching method for leaching metals in waste circuit board |
| CN101891166A (en) * | 2009-12-01 | 2010-11-24 | 西部矿业股份有限公司 | Method for leaching low-grade phosphorite with mixed bacillus of thiobacillus thioxidans and thiobacillus ferrooxidans |
Non-Patent Citations (3)
| Title |
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| 周培国等.氧化亚铁硫杆菌浸出线路板中铜的作用方式研究.《环境污染与防治》.2009,第31卷(第10期), * |
| 杨涛等.氧化亚铁硫杆菌浸出废弃线路板中铜的研究.《环境工程学报》.2009,第3卷(第05期), * |
| 龙来寿等.废旧印刷电路板资源化技术及无害化对策评述.《化工进展》.2009,第28卷(第06期), * |
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