CN104388987A - Method for preparing copper powder from metal powder of waste printed circuit boards by means of electrolysis - Google Patents
Method for preparing copper powder from metal powder of waste printed circuit boards by means of electrolysis Download PDFInfo
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- CN104388987A CN104388987A CN201410706929.6A CN201410706929A CN104388987A CN 104388987 A CN104388987 A CN 104388987A CN 201410706929 A CN201410706929 A CN 201410706929A CN 104388987 A CN104388987 A CN 104388987A
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Abstract
The invention discloses a method for preparing copper powder from metal powder of waste printed circuit boards by means of electrolysis. The metal powder obtained through mechanical separation is directly laminated and electrolyzed without pretreatments such as high-temperature liguation and measurement; electrons are used as ''a detergent'', and no extra solvent is needed; high-purity copper can be obtained if conditions are well controlled; the method disclosed by the invention is low in running cost, simple and convenient to operate and high in efficiency; crude copper of which the copper content is as high as 98.06% can be obtained, and the current efficiency at the moment is 98.12%.
Description
Technical field
The present invention relates to electronic waste recycling treatment and valuable metal recovery field, be specifically related to a kind of method of electrolytic preparation copper powder from the metal-powder of waste printed circuit board.
Background technology
Printed-wiring board (PWB) (Printed Circuit Boards, PCBs) is the primary member of electronics, is almost present in all electronic products.Recent years, along with the development of electronics and information industry, the generation of a large amount of electronic waste also makes the focus being treated as people's concern of waste printed circuit board (Waste Printed Circuit Boards, WPCBs).Waste printed circuit board complicated component, containing a large amount of as the heavy metals such as Pb, Hg, Cr and the persistence organic pollutant such as brominated flame-retardant and polychlorobiphenyl.If these materials are dealt with improperly, very big to the Health hazard of environment and human body.But on the other hand, employ a large amount of precious metals (gold and silver, palladium) and base metal (copper, iron, aluminium etc.) in printed wiring board manufacturing process, have recovery value.Especially, in waste and old press plate containing have an appointment 20% Cu, copper content is more much higher than general ore grade, be the 20-40 of general copper mine content doubly.The copper consumption of China increases day by day in recent years, and copper ore resource shortage, external interdependence strengthens, and have impact on the Economic development of China.If effectively can recycle the copper in waste printed circuit board, huge economic worth will be produced, can also promote that the resource recycling of the Cu in waste printed circuit board utilizes while minimizing environmental pollution.
At present, mechanical process, pyrometallurgy, hydrometallurgy and biological process are broadly divided into the recycling processing method of abandoned printed circuit board both at home and abroad.Mechanical treatment process has low, simple to operate, the oligosaprobic feature of cost, is the focus of current various countries exploitation.It adopts the physical methods such as dismounting, fragmentation, sorting that WPCBs is separated into two portions: a part is the non-metallic material comprising resin, and a part is the mixed-metal materials comprising copper.The mixed-metal materials that mechanical treatment process obtains is metal concentrate, and added value is not high, need carry out effective separating-purifying further.The metal-powder obtained after mechanical separation, mostly being of taking uses solution to leach, the rear separating metal composition of extraction, or electrolytic recovery copper wherein (application number: CN200910068428.9) after high temperature liquate separating metal.But these method production cycles are long, the waste liquid of generation, the process problem of waste gas is also badly in need of solving.Therefore, the research tendency of this technology should be the metal-powder that the process of how green high-efficient obtains after mechanical separation.
Summary of the invention
For solving the problem, the invention provides a kind of method of electrolytic preparation copper powder from the metal-powder of waste printed circuit board, by the metal-powder direct compression electrolysis obtained after mechanical separation, the pre-treatment such as do not need high temperature liquate or measure, be that " sanitising agent " does not need extra solvent with electronics, the condition of controlling well can obtain highly purified copper, and running cost is low, easy and simple to handle, efficiency is high.Meanwhile, electrolytic process is as the conventional production method of producing copper powder, and the powder obtaining copper powder has the features such as purity is high, clean surface.
For achieving the above object, the technical scheme that the present invention takes is:
From the metal-powder of waste printed circuit board, a method for electrolytic preparation copper powder, is characterized in that, comprises the steps:
S1, by from abandoned printed circuit board after Mechanical Crushing and electrostatic separation the copper-containing metal powder of gained metal concentrate dry after, add amount of conductive glue and mix, compression moulding, as anode;
S2, pure copper sheet is made into negative electrode of the same size with the anode of step S1 gained;
S3, by the negative electrode of the anode of step S1 gained and step S2 gained, fixing in electrolyzer, the spacing of regulating YIN and YANG pole also makes cathode-anode plate keeping parallelism in reaction process;
S4, add a certain amount of by CuSO
45H
2o, NaCl, dense H
2sO
4the electrolytic solution be mixed with, switches on power, and regulates current density, and after electrolysis certain hour, the copper powder that collection cathode plate surface and cathodic deposition are got off, uses deionized water, 30% (v/v) water/alcohol mixeding liquid washing respectively, obtain copper powder.(purity can reach more than 98%).
As preferably, CuSO in described electrolytic solution
45H
2o, NaCl, dense H
2sO
4ratio be: CuSO
45H
2o: NaCl: dense H
2sO
4=2 ~ 20: 12 ~ 60: 40 ~ 196.
As preferably, in described step S3, current density is 20 ~ 120mA/cm
2.
The present invention has following beneficial effect:
By the metal-powder direct compression electrolysis obtained after mechanical separation, the pre-treatment such as do not need high temperature liquate or measure, be that " sanitising agent " does not need extra solvent with electronics, the condition of controlling well can obtain highly purified copper, and running cost is low, easy and simple to handle, efficiency is high; Can obtain the blister copper that copper content reaches 98.06%, now current efficiency is 98.12%.
Accompanying drawing explanation
Fig. 1 is the preparation flow figure of the method for a kind of electrolytic preparation copper powder from the metal-powder of waste printed circuit board of the embodiment of the present invention.
Embodiment
In order to make objects and advantages of the present invention clearly understand, below in conjunction with embodiment, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
As shown in Figure 1, embodiments provide a kind of method of electrolytic preparation copper powder from the metal-powder of waste printed circuit board, it is characterized in that, comprise the steps:
S1, by from abandoned printed circuit board after Mechanical Crushing and electrostatic separation the copper-containing metal powder of gained metal concentrate dry after, add amount of conductive glue and mix, compression moulding, as anode;
S2, pure copper sheet is made into negative electrode of the same size with the anode of step S1 gained;
S3, by the negative electrode of the anode of step S1 gained and step S2 gained, fixing in electrolyzer, the spacing of regulating YIN and YANG pole also makes cathode-anode plate keeping parallelism in reaction process;
S4, add a certain amount of by CuSO
45H
2o, NaCl, dense H
2sO
4the electrolytic solution be mixed with, switches on power, and regulates current density, and after electrolysis certain hour, the copper powder that collection cathode plate surface and cathodic deposition are got off, uses deionized water, 30% (v/v) water/alcohol mixeding liquid washing respectively, obtain copper powder.
CuSO in described electrolytic solution
45H
2o, NaCl, dense H
2sO
4ratio be: CuSO
45H
2o: NaCl: dense H
28O
4=2 ~ 20: 12 ~ 60: 40 ~ 196; In described step S3, current density is 20 ~ 120mA/cm
2.
Embodiment 1
First take the copper content after mechanical treatment and reach 83% mixed metal powder 50g, after being directly compressed into plate after adding conductive resin under 20MPa, the rectangular plate being cut to 2cm × 5cm is used as anode, is used as negative electrode to be of a size of 2cm × 5cm copper sheet; Add 100mL electrolytic solution, electrolytic solution consists of CuSO
45H
2o (Cu
2+12.8g/L)+NaCl (Cl
-24g/L)+H
2sO
4(118g/L); Switch on power, by current density 80mA/cm
2set electric current, start electrolysis, after 3h, electrolytic reaction completes, and takes out battery lead plate, the copper powder that collection cathode plate surface and cathodic deposition are got off, use deionized water, 30% (v/v) water/alcohol mixeding liquid washing gained copper powder respectively, dry rear weighing for 50 DEG C, then gained copper powder fully being cleared up rear survey fine copper content is 98.06%, and current efficiency is 98.12%.
Embodiment 2
First take the copper content after mechanical treatment and reach 83% mixed metal powder 50g, after being directly compressed into plate after adding conductive resin under 20MPa, the rectangular plate being cut to 2cm × 5cm is used as anode, is used as negative electrode to be of a size of 2cm × 5cm copper sheet; Add 100mL electrolytic solution, electrolytic solution consists of CuSO
45H
2o (Cu
2+12.8g/L)+NaCl (Cl
-24g/L)+H
2sO
4(156g/L); Switch on power, by current density 80mA/cm
2set electric current, start electrolysis, after 3h, electrolytic reaction completes, and takes out battery lead plate, the copper powder that collection cathode plate surface and cathodic deposition are got off, use deionized water, 30% (v/v) water/alcohol mixeding liquid washing gained copper powder respectively, dry rear weighing for 50 DEG C, then gained copper powder fully being cleared up rear survey fine copper content is 97.25%, and current efficiency is 96.34%.
Embodiment 3
First take the copper content after mechanical treatment and reach 83% mixed metal powder 50g, after being directly compressed into plate after adding conductive resin under 20MPa, the rectangular plate being cut to 2cm × 5cm is used as anode, is used as negative electrode to be of a size of 2cm × 5cm copper sheet; Add 100mL electrolytic solution, electrolytic solution consists of CuSO
45H
2o (Cu
2+12.8g/L)+NaCl (Cl
-36g/L)+H
2sO
4(118g/L); Switch on power, by current density 80mA/cm
2set electric current, start electrolysis, after 3h, electrolytic reaction completes, and takes out battery lead plate, the copper powder that collection cathode plate surface and cathodic deposition are got off, use deionized water, 30% (v/v) water/alcohol mixeding liquid washing gained copper powder respectively, dry rear weighing for 50 DEG C, then gained copper powder fully being cleared up rear survey fine copper content is 96.27%, and current efficiency is 93.66%.
Embodiment 4
First take the copper content after mechanical treatment and reach 83% mixed metal powder 50g, after being directly compressed into plate after adding conductive resin under 20MPa, the rectangular plate being cut to 2cm × 5cm is used as anode, is used as negative electrode to be of a size of 2cm × 5cm copper sheet; Add 100mL electrolytic solution, electrolytic solution consists of CuSO
45H
2o (Cu
2+18g/L)+NaCl (Cl
-12g/L)+H
2sO
4(118g/L); Switch on power, by current density 80mA/cm
2set electric current, start electrolysis, after 3h, electrolytic reaction completes, and takes out battery lead plate, the copper powder that collection cathode plate surface and cathodic deposition are got off, use deionized water, 30% (v/v) water/alcohol mixeding liquid washing gained copper powder respectively, dry rear weighing for 50 DEG C, then the copper powder of gained fully being cleared up rear survey fine copper content is 97.94%, and current efficiency is 96.61%.
Embodiment 5
First take the copper content after mechanical treatment and reach 83% mixed metal powder 50g, after being directly compressed into plate after adding conductive resin under 20MPa, the rectangular plate being cut to 2cm × 5cm is used as anode, is used as negative electrode to be of a size of 2cm × 5cm copper sheet; Add 100mL electrolytic solution, electrolytic solution consists of CuSO
45H
2o (Cu
2+12.8g/L)+NaCl (Cl
-24g/L)+H
2sO
4(118g/L); Switch on power, by current density 80mA/cm
2set electric current, start electrolysis, after 4h, electrolytic reaction completes, and takes out battery lead plate, the copper powder that collection cathode plate surface and cathodic deposition are got off, use deionized water, 30% (v/v) water/alcohol mixeding liquid washing gained copper powder respectively, dry rear weighing for 50 DEG C, then the copper powder of gained fully being cleared up rear survey fine copper content is 96.64%, and current efficiency is 96.36%.
The above is only the preferred embodiment of the present invention; it should be pointed out that for those skilled in the art, under the premise without departing from the principles of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (3)
1. the method for electrolytic preparation copper powder from the metal-powder of waste printed circuit board, is characterized in that, comprise the steps:
S1, by from abandoned printed circuit board after Mechanical Crushing and electrostatic separation the copper-containing metal powder of gained metal concentrate dry after, add amount of conductive glue and mix, compression moulding, as anode;
S2, pure copper sheet is made into negative electrode of the same size with the anode of step S1 gained;
S3, by the negative electrode of the anode of step S1 gained and step S2 gained, fixing in electrolyzer, the spacing of regulating YIN and YANG pole also makes cathode-anode plate keeping parallelism in reaction process;
S4, add a certain amount of by CuSO
45H
2o, NaCl, dense H
2sO
4the electrolytic solution be mixed with, switches on power, and regulates current density, and after electrolysis certain hour, the copper powder that collection cathode plate surface and cathodic deposition are got off, uses deionized water, 30% (v/v) water/alcohol mixeding liquid washing respectively, obtain copper powder.
2. the method for a kind of electrolytical refined copper from the copper-containing metal material of waste printed circuit board according to claims 1, is characterized in that, CuSO in described electrolytic solution
45H
2o, NaCl, dense H
2sO
4ratio be: CuSO
45H
2o: NaCl: dense H
2sO
4=2 ~ 20: 12 ~ 60: 40 ~ 196.
3. the method for a kind of electrolytical refined copper from the copper-containing metal material of waste printed circuit board according to claims 1, is characterized in that, in described step S3, current density is 20 ~ 120 mA/cm
2.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410706929.6A CN104388987A (en) | 2014-12-01 | 2014-12-01 | Method for preparing copper powder from metal powder of waste printed circuit boards by means of electrolysis |
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|---|---|---|---|
| CN201410706929.6A CN104388987A (en) | 2014-12-01 | 2014-12-01 | Method for preparing copper powder from metal powder of waste printed circuit boards by means of electrolysis |
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| CN104388987A true CN104388987A (en) | 2015-03-04 |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107460503A (en) * | 2017-09-14 | 2017-12-12 | 西南科技大学 | The method that micro-nano copper powder is reclaimed from waste printed circuit board |
| CN108677021A (en) * | 2018-06-26 | 2018-10-19 | 兰州理工大学 | A method of recycling fine copper from useless circuit board |
| CN109234767A (en) * | 2017-07-10 | 2019-01-18 | 中国科学院过程工程研究所 | A kind of preparation method of spherical ultrafine copper powder |
| CN109252190A (en) * | 2018-11-07 | 2019-01-22 | 广州市吉池环保科技有限公司 | A method of it recycling 99.98% copper powder from etching solution and prepares 99.999% tough cathode |
| CN109267099A (en) * | 2017-07-18 | 2019-01-25 | 郑正 | A kind of non-melting electrolysis process process of copper scap compression moulding |
| CN110071316A (en) * | 2019-04-26 | 2019-07-30 | 重庆大学 | The hot recycling ammonia battery and processing method constituted using discarded printed electronics wiring board |
| CN110788337A (en) * | 2018-08-01 | 2020-02-14 | 铜陵富翔铜再生循环利用有限公司 | Method for preparing high-purity copper powder by using waste enameled wires |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109234767A (en) * | 2017-07-10 | 2019-01-18 | 中国科学院过程工程研究所 | A kind of preparation method of spherical ultrafine copper powder |
| CN109234767B (en) * | 2017-07-10 | 2021-01-15 | 中国科学院过程工程研究所 | Preparation method of superfine spherical copper powder |
| CN109267099A (en) * | 2017-07-18 | 2019-01-25 | 郑正 | A kind of non-melting electrolysis process process of copper scap compression moulding |
| CN107460503A (en) * | 2017-09-14 | 2017-12-12 | 西南科技大学 | The method that micro-nano copper powder is reclaimed from waste printed circuit board |
| CN107460503B (en) * | 2017-09-14 | 2019-07-02 | 西南科技大学 | The method of micro-nano copper powder is recycled from waste printed circuit board |
| CN108677021A (en) * | 2018-06-26 | 2018-10-19 | 兰州理工大学 | A method of recycling fine copper from useless circuit board |
| CN110788337A (en) * | 2018-08-01 | 2020-02-14 | 铜陵富翔铜再生循环利用有限公司 | Method for preparing high-purity copper powder by using waste enameled wires |
| CN109252190A (en) * | 2018-11-07 | 2019-01-22 | 广州市吉池环保科技有限公司 | A method of it recycling 99.98% copper powder from etching solution and prepares 99.999% tough cathode |
| CN110071316A (en) * | 2019-04-26 | 2019-07-30 | 重庆大学 | The hot recycling ammonia battery and processing method constituted using discarded printed electronics wiring board |
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Application publication date: 20150304 |