CN107502920A - A kind of method of the hydrometallurgic recovery copper from circuit board - Google Patents

A kind of method of the hydrometallurgic recovery copper from circuit board Download PDF

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Publication number
CN107502920A
CN107502920A CN201710682375.4A CN201710682375A CN107502920A CN 107502920 A CN107502920 A CN 107502920A CN 201710682375 A CN201710682375 A CN 201710682375A CN 107502920 A CN107502920 A CN 107502920A
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China
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copper
electrolysis
shaking table
circuit board
anode
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CN201710682375.4A
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Chinese (zh)
Inventor
王群
洪斌
杨桂芬
王辉
赵阔
张怡
彭锐
杨龙
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Yunnan Dragon Science And Technology Environmental Protection Ltd By Share Ltd
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Yunnan Dragon Science And Technology Environmental Protection Ltd By Share Ltd
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Priority to CN201710682375.4A priority Critical patent/CN107502920A/en
Publication of CN107502920A publication Critical patent/CN107502920A/en
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    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
    • C25C1/00—Electrolytic production, recovery or refining of metals by electrolysis of solutions
    • C25C1/12—Electrolytic production, recovery or refining of metals by electrolysis of solutions of copper
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B17/00—Recovery of plastics or other constituents of waste material containing plastics
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/50—Reuse, recycling or recovery technologies
    • Y02W30/62—Plastics recycling; Rubber recycling

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Environmental & Geological Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Electrolytic Production Of Metals (AREA)

Abstract

The invention discloses a kind of method of the hydrometallurgic recovery copper from circuit board, comprise the following steps：1) crushed after circuit board is sorted, cross magnetic separation and three-level shaking table, produce tail water, resin and copper rice；2) the copper rice handled well is framed up Direct Electrolysis, obtains electrolyte, cathode copper and electrolysis remaining；3) electrolyte is largely returned into electrolytic tank electrolysis, small part enters Winning cell electrode, obtain electro deposited copper and electric effusion, the electric effusion return to step 2) in participate in electrolysis；4) electrolysis remaining is separated with shaking table after being come out with helical feed, the red copper rice return to step 2 isolated) in participate in electrolysis；Resin regeneration recycles；Shaking table tail water returns to shaking table and used；The earth of positive pole send noble metal workshop to reclaim noble metal, and water used in each workshop section of the present invention is all to recycle, no sewage, waste gas, waste sludge discharge；Copper recovery is high, and electricity effect is high, and power consumption is low；Resin resource recovery is high；Other valuable metals and noble metal can be recycled in subsequent technique.

Description

A kind of method of the hydrometallurgic recovery copper from circuit board
Technical field
The invention belongs to nonferrous metals recycling field, and in particular to a kind of method of the hydrometallurgic recovery copper from circuit board.
Background technology
Current domestic electronic waste is mainly waste and old circuit board, and useless circuit board is after disassembling also containing plastics, resin, fibre The harmful substances such as dimension, fire retardant, such as handled with traditional thermal process, can produce bioxin and a variety of toxic gases after burning, Huge destruction is caused to environment, immeasurable injury is caused to human body, and the rate of recovery is low, high energy consumption, wastes serious.
Waste and old circuit board is classified by artificial roughing, then obtains copper rice, copper rice with the higher equipment processing of mechanization program In also have substantial amounts of plastics and resin, if being reclaimed with pyrogenic process founding, substantial amounts of bioxin toxic gas can be produced during founding, and Lose larger.And it is then a kind of ideal processing method to use Direct Electrolysis.Therefore, the present invention is framed up directly using copper rice Electrolysis, during whole hydrometallurgic recovery, externally discharges also without the discharge of waste water without gas, promotes environmental protection.
The content of the invention
In order to make up above deficiency, the invention provides a kind of method of the hydrometallurgic recovery copper from circuit board.
The solution of the present invention is：
A kind of method of the hydrometallurgic recovery copper from circuit board, comprises the following steps：
1) crushed after circuit board is sorted, cross magnetic separation and three-level shaking table, produce tail water, resin and copper rice；
2) the copper rice handled well is framed up Direct Electrolysis, anode is the glass steel material material frame specially designed, and stainless steel is made For negative electrode, for like poles away from 80~120mm, contact rod is copper rod；200~300A/m of current density2, 60 DEG C of electrolysis temperature, electrolysis Liquid internal circulating load 10% is per minute, and feed liquor mode is to drench into anode frame, goes out under liquid mode is and goes out liquid, electrolysing period 5 days；It is electrolysed Liquid, cathode copper and electrolysis remaining；
3) electrolyte is largely returned into electrolytic tank electrolysis, small part enters Winning cell electrode, and electrodeposition anode is pb-ag alloy Plate, negative electrode are stainless steel plate, and anode is more slightly larger than negative electrode；180~220A/m of current density2, temperature 60 C, electrolysing period 7 days； To electro deposited copper and electric effusion, the electric effusion return to step 2) in participate in electrolysis；
4) electrolysis remaining is separated with shaking table after being come out with helical feed, the red copper rice return to step 2 isolated) in participate in electricity Solution；Resin regeneration recycles；Shaking table tail water returns to shaking table and used；The earth of positive pole send noble metal workshop to reclaim noble metal.
As preferable technical scheme, step 2) the electrolyte endless form goes out to drench into anode frame feed liquor under baffle plate Liquid.
As preferable technical scheme, step 4) the electrolysis remaining sends out groove using the spiral transferring of anode frame bottom.
By adopting the above-described technical solution, a kind of method of the hydrometallurgic recovery copper from circuit board, comprises the following steps：1) Crushed after circuit board is sorted, cross magnetic separation and three-level shaking table, produce tail water, resin and copper rice；2) the copper rice that will be handled well Frame up Direct Electrolysis, and anode is the glass steel material material frame that specially designs, stainless steel as negative electrode, like poles away from 80~120mm, Contact rod is copper rod；200~300A/m of current density2, 60 DEG C of electrolysis temperature, electrolyte internal circulating load 10% is per minute, feed liquor side Formula is to drench into anode frame, goes out under liquid mode is and goes out liquid, electrolysing period 5 days；Obtain electrolyte, cathode copper and electrolysis remaining；3) will Electrolyte largely returns to electrolytic tank electrolysis, and small part enters Winning cell electrode, and electrodeposition anode is pb-ag alloy plate, and negative electrode is stainless Steel plate, anode are more slightly larger than negative electrode；180~220A/m of current density2, temperature 60 C, electrolysing period 7 days；Obtain electro deposited copper and electricity Hydrops, the electric effusion return to step 2) in participate in electrolysis；4) electrolysis remaining is separated after being come out with helical feed with shaking table, is separated The red copper rice return to step 2 gone out) in participate in electrolysis；Resin regeneration recycles；Shaking table tail water returns to shaking table and used；The earth of positive pole is sent Reclaim noble metal in noble metal workshop.
The technology of the present invention advantage embodies：
Present invention process solution closed cycle, water used in each workshop section are all to recycle, no sewage, waste gas, waste sludge discharge； Copper recovery is high, and electricity effect is high, and power consumption is low；Tough cathode all reaches international one-level electrolytic copper；Resin can send plastic molding and processing plant's regeneration recovery, Resource recovery is high；Other valuable metals and noble metal can be recycled in subsequent technique；Present invention process is advanced can Lean on, confirmed through pilot-plant test, technological process is short, consistent, compared with the big ear anode of casting again electrorefining, has copper recovery Rate is high, the advantages that without consuming fuel and good environmental protection.
The present invention after sorting and crushing, separates circuit board through magnetic separation, shaking table, carries out electrorefining afterwards, groove forces down, electricity Effect is high, power consumption is low, and impurity will not accumulate in electrolyte.
The present invention uses the parallel circulation endless form of electrolyte, and circulation fluid adds from anode frame, from bottom of electrolytic tank stream Go out.For stainless steel as negative electrode, contact rod is copper rod.Electrolysis remaining is opened a way from bottom of electrolytic tank, and anode superstructure bottom is equipped with spiral, Electrolysis remaining is separated after being come out with helical feed with shaking table, and the copper rice isolated returns to electrolysis；Resin regeneration recycles；Tail water Shaking table is returned to use；The earth of positive pole send noble metal workshop to reclaim noble metal.Seven days open circuit once electrolytic remainings, while filler is once. When current density is relatively low, the electrolytic efficiency of anodic solution copper is more than the current efficiency that negative electrode separates out copper, the copper ion in electrolyte There is ever-increasing trend, the copper ion of growth is handled with electrodeposition；(current density is more than 250A/m when current density is higher2When) Copper ion is without the trend increased in electrolyte, therefore electrolyte avoids the need for being handled with electrodeposition.
Brief description of the drawings
Fig. 1 is the process chart of the present invention.
Embodiment
Following experiment master data embodies the specific embodiment of the present invention.
Case study on implementation 1
1st, crushed after circuit board is sorted, cross magnetic separation and three-level shaking table, produce tail water, resin and copper rice, the copper Rice contains Cu 86.94%, resin 10.97%, Fe 0.015%, Zn 0.009%, Pb 0.008%, Sn 0.03%, As< 0.001%, Sb 0.03%, P<0.001%, Au 0.75g/t, Ag 44.45g/t, Pd 0.72g/t, Pt<0.1g/t, Rh< 0.1g/t
2nd, the copper rice handled well is framed up Direct Electrolysis, anode is the glass steel material material frame specially designed, and stainless steel is made For negative electrode, for like poles away from 120mm, contact rod is copper rod；Current density 200A/m2, 60 DEG C of electrolysis temperature, electrolyte internal circulating load 10% is per minute, and feed liquor mode is to drench into anode frame, goes out under liquid mode is and goes out liquid, electrolysing period 5 days；Electrolyte cupric 35g/L- 40g/L, sulfuric acid 180g/L-195g/L；Tank voltage 0.21V, cathode efficiency 99.7%, unit dc consumption 178kwh/T(copper)； Tough cathode is more than 99.995% containing Cu；Fe 0.002%；Ni 0.001%；Pb 0.001%；Zn 0.001%；As 0.001%；Bi 0.0005%；Sb 0.001%；Sn 0.001%, inframe electrolysis remaining separate through shaking table, and remaining copper rice returns Electrolysis.Earth of positive pole yield 0.98%, containing Cu 22.2%；Resin 60%；Fe 0.36%；Pb 0.63%；Zn 0.75%；Ni 0.01%；Bi 0.004%；Sb 0.0014%；As 0.01%；Sn 0.56%；Au 17.53g/T；Ag 262.8g/T；Pt 0.36g/T；Pd 26.14g/T；Rh 0.1g/T.The earth of positive pole send noble metal workshop to reclaim noble metal.
3rd, electrolyte largely returns to electrolytic tank electrolysis, and small part enters Winning cell electrode, and electrodeposition anode is pb-ag alloy plate, Negative electrode is stainless steel plate, and anode is more slightly larger than negative electrode；Current density 180A/m2, temperature 60 C, electrolysing period 7 days；Tank voltage 1.6V, current efficiency 98.7%, unit dc consumption 1280kwh/T(copper)；Electro deposited copper contains Cu 99.995%, Fe 0.002%, Ni 0.001%, Pb 0.001%, Zn 0.001%, As 0.0001%, Bi 0.0005%, Sb 0.001%, Sn 0.001%； Electro deposited copper and cathode copper have all reached country-level electrolytic copper standard.
4th, electrolysis remaining is separated after being come out with helical feed with shaking table, and the red copper rice isolated returns to electrolysis；Resin regeneration Recycle；Shaking table tail water returns to shaking table and used；The earth of positive pole send noble metal workshop to reclaim noble metal.
Continuous electrolysis clear groove after 4 months, data and is analyzed as follows：
Electro deposited copper accounts for the 2% of total precipitation copper, and resin rate is 0.19%；Anode slime rate is 0.98%, contact rod loss late 0.4%；Cathode efficiency 99.7%, unit dc consumption 178kwh/T(copper)；Copper recovery is up to 98%.
Case study on implementation 2
1st, crushed after circuit board is sorted, cross magnetic separation and three-level shaking table, produce tail water, resin and copper rice, the copper Rice contains Cu 86.94%, resin 10.97%, Fe 0.015%, Zn 0.009%, Pb 0.008%, Sn 0.03%, As< 0.001%, Sb 0.03%, P<0.001%, Au 0.75g/t, Ag 44.45g/t, Pd 0.72g/t, Pt<0.1g/t, Rh< 0.1g/t
2nd, the copper rice handled well is framed up Direct Electrolysis, anode is the glass steel material material frame specially designed, and stainless steel is made For negative electrode, for like poles away from 80mm, contact rod is copper rod；Current density 300A/m2, 60 DEG C of electrolysis temperature, electrolyte internal circulating load 10% is per minute, and feed liquor mode is to drench into anode frame, goes out under liquid mode is and goes out liquid, electrolysing period 5 days；Electrolyte cupric 35g/L- 40g/L, sulfuric acid 180g/L-195g/L；Tank voltage 0.3V, cathode efficiency 99.5%, unit dc consumption 254kwh/T(copper)；It is cloudy Pole copper is more than 99.95%, Fe 0.002%, Ni 0.001%, Pb 0.001%, Zn 0.001%, As 0.001%, Bi containing Cu 0.0005%, Sb 0.001%, Sn 0.001%；Inframe electrolysis remaining separates through shaking table, and remaining copper rice returns to electrolysis.The earth of positive pole Yield 1.2%, containing Cu 19.5%；Resin 75%；Fe 0.0.38%；Pb 0.65%；Zn 0.98%；Ni 0.01%；Bi 0.004%；Sb 0.0014%；As 0.01%；Sn 0.56%；Au 17.53g/T；Ag 262.8g/T；Pt 0.36g/T；Pd 26.14g/T；Rh 0.1g/T.The earth of positive pole send noble metal workshop to reclaim noble metal.
3rd, electrolyte largely returns to electrolytic tank electrolysis, and small part enters Winning cell electrode, and electrodeposition anode is pb-ag alloy plate, Negative electrode is stainless steel plate, and anode is more slightly larger than negative electrode；Current density 200A/m2, temperature 60 C, electrolysing period 7 days；Tank voltage 1.7V, current efficiency 98.5%, unit dc consumption 1456kwh/T(copper)；Electro deposited copper contains Cu 99.97%, Fe 0.002%, Ni 0.001%, Pb 0.001%, Zn 0.001%, As 0.0001%, Bi 0.0005%, Sb 0.001%, Sn 0.001%； Electro deposited copper and cathode copper have all reached country-level electrolytic copper standard.
4th, electrolysis remaining is separated after being come out with helical feed with shaking table, and the red copper rice isolated returns to electrolysis；Resin regeneration Recycle；Shaking table tail water returns to shaking table and used；The earth of positive pole send noble metal workshop to reclaim noble metal.
Continuous electrolysis clear groove after 1 month, data and is analyzed as follows：
Electro deposited copper accounts for the 0.1% of total precipitation copper, and resin rate is 0.3%；Anode slime rate is 1.5%, contact rod loss late 0.8%；Cathode efficiency 99.5%, unit dc consumption 254kwh/T(copper)；Copper recovery is up to 98.5%.
Case study on implementation 3
1st, crushed after circuit board is sorted, cross magnetic separation and three-level shaking table, produce tail water, resin and copper rice, the copper Rice contains Cu 86.94%, resin 10.97%, Fe 0.015%, Zn 0.009%, Pb 0.008%, Sn 0.03%, As< 0.001%, Sb 0.03%, P<0.001%, Au 0.75g/t, Ag 44.45g/t, Pd 0.72g/t, Pt<0.1g/t, Rh< 0.1g/t
2nd, the copper rice handled well is framed up Direct Electrolysis, anode is the glass steel material material frame specially designed, and stainless steel is made For negative electrode, for like poles away from 100mm, contact rod is copper rod；Current density 250A/m2, 60 DEG C of electrolysis temperature, electrolyte internal circulating load 10% is per minute, and feed liquor mode is to drench into anode frame, goes out under liquid mode is and goes out liquid, electrolysing period 5 days；Electrolyte cupric 35g/L- 40g/L, sulfuric acid 180g/L-195g/L；Tank voltage 0.25V, cathode efficiency 99.2%, unit dc consumption 213kwh/T(copper)； Tough cathode is more than 99.98%, Fe 0.002%, Ni 0.001%, Pb 0.001%, Zn 0.001%, As 0.001% containing Cu, Bi 0.0005%, Sb 0.001%, Sn 0.001%；Inframe electrolysis remaining separates through shaking table, and remaining copper rice returns to electrolysis.Sun Pole mud yield 1.5%, containing Cu 25.2%；Resin 75%；Fe 0.36；Pb 0.63%；Zn 0.75%；Ni 0.01%；Bi 0.004%；Sb 0.0014%；As 0.01%；Sn 0.56%；Au 17.53g/T；Ag 262.8g/T；Pt 0.36g/T；Pd 26.14g/T；Rh 0.1g/T.The earth of positive pole send noble metal workshop to reclaim noble metal.
3rd, electrolyte largely returns to electrolytic tank electrolysis, and small part enters Winning cell electrode, and electrodeposition anode is pb-ag alloy plate, Negative electrode is stainless steel plate, and anode is more slightly larger than negative electrode；Current density 220A/m2, temperature 60 C, electrolysing period 7 days；Tank voltage 1.7V, current efficiency 98%, unit dc consumption 1464kwh/T(copper)；Electro deposited copper contains Cu 99.98%, Fe 0.002%, Ni 0.001%, Pb 0.001%, Zn 0.001%, As 0.0001%, Bi 0.0005%, Sb 0.001%, Sn 0.001%； Electro deposited copper and cathode copper have all reached country-level electrolytic copper standard.
4th, electrolysis remaining is separated after being come out with helical feed with shaking table, and the red copper rice isolated returns to electrolysis；Resin regeneration Recycle；Shaking table tail water returns to shaking table and used；The earth of positive pole send noble metal workshop to reclaim noble metal.
Continuous electrolysis clear groove after 2 months, data and is analyzed as follows：
Electro deposited copper accounts for the 1.0% of total precipitation copper, and resin rate is 0.25%；Anode slime rate is 1.2%, contact rod loss late 0.6%；Cathode efficiency 99.7%, unit dc consumption 213kwh/T(copper)；Copper recovery is up to 98.5%.
General principle, principal character and the advantages of the present invention of the present invention has been shown and described above.The technology of the industry Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the simply explanation described in above-described embodiment and specification is originally The principle of invention, without departing from the spirit and scope of the present invention, various changes and modifications of the present invention are possible, these changes Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and its Equivalent circle.

Claims (3)

  1. A kind of 1. method of the hydrometallurgic recovery copper from circuit board, it is characterised in that comprise the following steps：
    1) crushed after circuit board is sorted, cross magnetic separation and three-level shaking table, produce tail water, resin and copper rice；
    2) the copper rice handled well is framed up Direct Electrolysis, anode is the glass steel material material frame specially designed, and stainless steel is as cloudy Pole, for like poles away from 80~120mm, contact rod is copper rod；200~300A/m of current density2, 60 DEG C of electrolysis temperature, electrolyte follows Circular rector 10% is per minute, and feed liquor mode is to drench into anode frame, goes out under liquid mode is and goes out liquid, electrolysing period 5 days；Obtain electrolyte, Cathode copper and electrolysis remaining；
    3) electrolyte is largely returned into electrolytic tank electrolysis, small part enters Winning cell electrode, and electrodeposition anode is pb-ag alloy plate, cloudy Extremely stainless steel plate, anode are more slightly larger than negative electrode；180~220A/m of current density2, temperature 60 C, electrolysing period 7 days；Obtain electricity Product copper and electric effusion, the electric effusion return to step 2) in participate in electrolysis；
    4) electrolysis remaining is separated with shaking table after being come out with helical feed, the red copper rice return to step 2 isolated) in participate in electrolysis； Resin regeneration recycles；Shaking table tail water returns to shaking table and used；The earth of positive pole send noble metal workshop to reclaim noble metal.
  2. A kind of 2. method of the hydrometallurgic recovery copper from circuit board as claimed in claim 1, it is characterised in that：Step 2) the electricity Solution liquid endless form goes out liquid to drench into anode frame feed liquor under baffle plate.
  3. A kind of 3. method of the hydrometallurgic recovery copper from circuit board as claimed in claim 1, it is characterised in that：Step 4) the electricity Solution remaining sends out groove using the spiral transferring of anode frame bottom.
CN201710682375.4A 2017-08-10 2017-08-10 A kind of method of the hydrometallurgic recovery copper from circuit board Pending CN107502920A (en)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102534656A (en) * 2012-02-10 2012-07-04 嘉兴科菲冶金科技股份有限公司 Process for recycling copper through electrodeposition by treating scrap copper materials by adopting cyclone electrolysis technology
CN102776527A (en) * 2012-07-31 2012-11-14 安徽嘉伟再生资源有限公司 Novel clean, energy-saving and environment-friendly technology for extracting high-grade copper plate by utilizing waste containing copper
KR20130000156U (en) * 2012-11-09 2013-01-08 (주)유현전자 Apparatus of withdrawing copper from the copper-coated clip for board
CN104532005A (en) * 2014-12-23 2015-04-22 清远市东江环保技术有限公司 Resourceful comprehensive utilization method of waste printed circuit boards
CN105112674A (en) * 2015-09-18 2015-12-02 中南大学 All-wet recovery process for waste circuit boards

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102534656A (en) * 2012-02-10 2012-07-04 嘉兴科菲冶金科技股份有限公司 Process for recycling copper through electrodeposition by treating scrap copper materials by adopting cyclone electrolysis technology
CN102776527A (en) * 2012-07-31 2012-11-14 安徽嘉伟再生资源有限公司 Novel clean, energy-saving and environment-friendly technology for extracting high-grade copper plate by utilizing waste containing copper
KR20130000156U (en) * 2012-11-09 2013-01-08 (주)유현전자 Apparatus of withdrawing copper from the copper-coated clip for board
CN104532005A (en) * 2014-12-23 2015-04-22 清远市东江环保技术有限公司 Resourceful comprehensive utilization method of waste printed circuit boards
CN105112674A (en) * 2015-09-18 2015-12-02 中南大学 All-wet recovery process for waste circuit boards

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* Cited by examiner, † Cited by third party
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周益辉 等: "废弃电路板的资源特点及回收处理技术", 《技术》 *

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