CN104745824A - Method for recovering copper from waste circuit board - Google Patents
Method for recovering copper from waste circuit board Download PDFInfo
- Publication number
- CN104745824A CN104745824A CN201510114597.7A CN201510114597A CN104745824A CN 104745824 A CN104745824 A CN 104745824A CN 201510114597 A CN201510114597 A CN 201510114597A CN 104745824 A CN104745824 A CN 104745824A
- Authority
- CN
- China
- Prior art keywords
- copper
- circuit board
- waste circuit
- circuit card
- ore pulp
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- 239000010949 copper Substances 0.000 title claims abstract description 50
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 title claims abstract description 47
- 229910052802 copper Inorganic materials 0.000 title claims abstract description 47
- 238000000034 method Methods 0.000 title claims abstract description 30
- 239000002699 waste material Substances 0.000 title abstract description 11
- 238000002386 leaching Methods 0.000 claims abstract description 23
- NLXLAEXVIDQMFP-UHFFFAOYSA-N Ammonia chloride Chemical compound [NH4+].[Cl-] NLXLAEXVIDQMFP-UHFFFAOYSA-N 0.000 claims abstract description 22
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims abstract description 22
- 235000019270 ammonium chloride Nutrition 0.000 claims abstract description 11
- 238000011084 recovery Methods 0.000 claims abstract description 8
- 238000003756 stirring Methods 0.000 claims abstract description 6
- 238000002156 mixing Methods 0.000 claims abstract description 4
- 239000000843 powder Substances 0.000 claims abstract description 4
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 8
- 239000007788 liquid Substances 0.000 claims description 7
- 229910021529 ammonia Inorganic materials 0.000 claims description 4
- 239000013618 particulate matter Substances 0.000 claims description 2
- 235000011114 ammonium hydroxide Nutrition 0.000 abstract description 12
- 229910052751 metal Inorganic materials 0.000 abstract description 12
- 239000002184 metal Substances 0.000 abstract description 12
- 230000008569 process Effects 0.000 abstract description 10
- 238000006243 chemical reaction Methods 0.000 abstract description 8
- 230000008901 benefit Effects 0.000 abstract description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 150000002739 metals Chemical class 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 abstract 1
- 238000009854 hydrometallurgy Methods 0.000 abstract 1
- 230000003647 oxidation Effects 0.000 description 9
- 238000007254 oxidation reaction Methods 0.000 description 9
- 238000002604 ultrasonography Methods 0.000 description 7
- 229910052500 inorganic mineral Inorganic materials 0.000 description 6
- 239000011707 mineral Substances 0.000 description 6
- 239000002253 acid Substances 0.000 description 5
- 239000000243 solution Substances 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- JPVYNHNXODAKFH-UHFFFAOYSA-N Cu2+ Chemical compound [Cu+2] JPVYNHNXODAKFH-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 150000003863 ammonium salts Chemical class 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- QKSIFUGZHOUETI-UHFFFAOYSA-N copper;azane Chemical compound N.N.N.N.[Cu+2] QKSIFUGZHOUETI-UHFFFAOYSA-N 0.000 description 2
- ZUOUZKKEUPVFJK-UHFFFAOYSA-N diphenyl Chemical compound C1=CC=CC=C1C1=CC=CC=C1 ZUOUZKKEUPVFJK-UHFFFAOYSA-N 0.000 description 2
- USIUVYZYUHIAEV-UHFFFAOYSA-N diphenyl ether Chemical compound C=1C=CC=CC=1OC1=CC=CC=C1 USIUVYZYUHIAEV-UHFFFAOYSA-N 0.000 description 2
- 239000010793 electronic waste Substances 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 238000006479 redox reaction Methods 0.000 description 2
- 239000012266 salt solution Substances 0.000 description 2
- 230000002195 synergetic effect Effects 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 235000010290 biphenyl Nutrition 0.000 description 1
- 239000004305 biphenyl Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000003063 flame retardant Substances 0.000 description 1
- 239000000796 flavoring agent Substances 0.000 description 1
- 235000019634 flavors Nutrition 0.000 description 1
- 238000013467 fragmentation Methods 0.000 description 1
- 238000006062 fragmentation reaction Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 231100001261 hazardous Toxicity 0.000 description 1
- 239000000383 hazardous chemical Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000005272 metallurgy Methods 0.000 description 1
- 229910017604 nitric acid Inorganic materials 0.000 description 1
- 229910000510 noble metal Inorganic materials 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 230000001473 noxious effect Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 238000000053 physical method Methods 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 230000007096 poisonous effect Effects 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 238000010298 pulverizing process Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
Classifications
-
- 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
Landscapes
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention discloses a method for recovering copper from a waste circuit board and belongs to the technical field of hydrometallurgy. The method comprises the following steps: firstly crushing the waste circuit board into powder, fully mixing the powder, an ammonia water solution, an ammonium chloride solution and water to obtain ore pulp, introducing air into the ore pulp, and carrying out ultrasonic wave intensified leaching under a stirring condition; and periodically adding hydrogen peroxide in the intensified leaching process so as to leach copper from the waste circuit board, wherein the leaching rate of copper from the waste circuit board leached in 1 hour reaches over 98%. The method disclosed by the invention realizes resource utilization of effective components of the waste circuit board and moreover, the method has the advantages of being environment-friendly, mild in reaction and short in technological process, the production cost can be lowered and the metal copper recovery rate is high, and the method is suitable for recovering valuable metals in the waste circuit board.
Description
Technical field
The present invention relates to a kind of method reclaiming copper in useless circuit card, belong to technical field of wet metallurgy.
Background technology
Along with the progress of human civilization with science and technology, the consumption of Mineral resources and day increase severely.But due to the exhaustion day by day of higher-grade Mineral resources, there will be the problem of resource scarcity in metal production process, this just needs people to extract metal from various ore and trade waste.
World today's electronics, electrical equipment industry are fast-developing, the technological innovation emerged in an endless stream and the market of sustainable growth
Demand, increases the turnout of electronics, electrical equipment, simultaneously also accelerates electronics, the renewal of electrical equipment changes
In generation, cause creating a large amount of waste electronics, electrical equipment, be thereupon it to the serious harm of environment and
Impact.In electronic waste containing in a large number to the poisonous and hazardous chemical substance of human body as lead, pot, sexavalent chrome, igelite, polymerization Australia biphenyl (PBB), be polymerized shore diphenyl ether (PBDE) and shore fire retardant etc.If these refuses do not pass through the recycling of specialty, wherein hazardous and noxious substances enters into human body by food chain through the approach such as soil, water again by plant absorption, finally jeopardizes the mankind.But electron wastes is again a resource concentration body, containing abundant metal and nonmetal resource,
Recovery for useless circuit card is not only for its generation huge, to the serious harm of environment, also can directly utilize or the resource of reproducible utilization containing a large amount of in useless circuit card, such as metal, noble metal and rare metal, resin and filamentary material etc. simultaneously.With useless computer main board, metal accounts for 45.6%, and wherein metallic copper just accounts for 23.7%.Copper is a kind of important nonferrous materials, has a wide range of applications in the field such as electric, light industry, machinofacture, building industry, attacking and defending industry.But the content of copper in the earth's crust is few, and reserves are few.Therefore, the angle no matter from environment protection or the angle from resource reutilization, all have certain social and economic significance to waste printed circuit board comprehensive reutilization.
At present, the Technology that the useless circuit card of conventional Study and appliance is recycled mainly is divided into four large classes:
Physical, heat treating process, wet method and biotechnology method.But often kind of method has different drawback.
Physical method is difference according to each component physicals in useless circuit card and realizes a kind of method of reclaiming.Physical is mainly divided into the main process such as dismounting, fragmentation, sorting.But Physical needs high-quality large-scale treatment facility, investment is comparatively large, and due to the moiety of useless circuit card complicated, full automatic isolation technique of disassembling still can not realize, by hand disassemble expense higher, after boring after pulverizing mixes, later separation is had a great impact.
Heat treating process, although higher metal recovery rate (its metal recovery rate is up to more than 90% usually) also can be obtained, but a large amount of obnoxious flavour can be produced when there is binding agent or other organism etc. in electronic waste, secondary pollution is caused to environment, in addition heat treating method power consumption is large, treatment facility is expensive, and economic benefit is low.Oxygenant is made in wet method acid, and in treating processes, N is reduced to lower valency by high-valence state and inevitably produces a large amount of NO gas, contaminate environment.In the research of wet method leaching copper, the normal leaching agent adopted is mineral acid, as sulfuric acid, nitric acid, hydrochloric acid etc., but adopting mineral acid to leach easily makes other metals beyond copper be transferred to liquid phase together with copper, makes the leaching process of subsequent metal copper complicated, increases processing cost.Biotechnological means is also still in the experimental study stage now, and corresponding leaching needs the longer time, and leaching rate is lower, is difficult to realize large-scale application.
Summary of the invention
The object of the invention is for the deficiencies in the prior art, provide a kind of method reclaiming copper in useless circuit card, considerably reduce the cost recovery of copper in useless circuit card, achieve the recycling of effective constituent in useless circuit card, economize on resources, protection of the environment; Specifically comprise the following steps:
(1) useless circuit card sample machinery is crushed to is less than 200 orders;
(2) obtain ore pulp after being mixed with ammonium chloride solution, ammonia soln by useless circuit card powder, wherein, in ore pulp, ammonia soln concentration is 1-4mol/L, and ammonium chloride solution concentration is 1-5mol/L, solid-to-liquid ratio 1:3-1:8;
(3) at room temperature, by 10 ~ 12 m
3the speed of/h passes into air, stirs ore pulp, carries out intensified by ultrasonic wave simultaneously and leaches 1 ~ 4h, in mixing solutions, add hydrogen peroxide in the ratio of 1L/t-3L/t every 20min simultaneously, the speed of mixing is 200-800r/ min, guarantees that particulate matter keeps suspended state ultrasonic power to be 60 ~ 180 W, stirs
Principle of the present invention is as follows:
The present invention utilizes hyperacoustic strengthening effect, and ultrasonic wave produces cavitation phenomenon in ore pulp, when cavitation bubble collapses, in space minimum in very short time and around cavitation bubble, produces the high temperature and about 5 × 10 of more than 5000K
7the high pressure of Pa, rate of temperature change is up to 10
9k/s, and the jet producing that strong shockwave and (or) speed per hour reach 400Km.Hyperacoustic cavatition can make the metallic copper that is wrapped in useless circuit card out exposed; Jet produces strong stirring action to ore pulp again, accelerates and facilitate the dissolving of metallic copper in useless circuit card; The oxygen that pass into air in ultrasound reactor both can provide leaching process to need simultaneously also ensure that the continuous and effective of ultrasonic cavitation.
Do not use mineral acid when the present invention leaches, but use ammoniacal liquor and ammonium chloride solution; Ammoniacal liquor and ammonium salt solution can form Copper-ammonia Complex with the cupric ion in copper-containing ore or refuse, and selective copper can be leached, leach liquor is purer, and foreign matter content is low.
The present invention is with while ultrasound-enhanced, utilize the synergy of hydrogen peroxide and ammoniacal liquor, oxidation reduction reaction, its temperature of reaction is lower, and its temperature of reaction is lower, can carry out at normal temperatures and pressures, both can save energy, again reduce the material requirement to equipment, thus can investment be reduced, and reduce the difficulty of operation of equipment; Hydrogen peroxide and ammoniacal liquor synergistic oxidation are considerably beyond the two independent oxidation effectiveness.Chemical equation is as follows:
CuO + NH
3+ NH
4 ++O
2→ Cu(NH
3)
4 2+ + H
2O
Cu
2O + NH
3+ NH
4 ++O
2→ Cu(NH
3)
2 ++ H
2O
The present invention compared with prior art, has following beneficial effect:
(1) considerably reduce the cost recovery of metallic copper in useless circuit card, avoid environmental pollution simultaneously;
(2) leaching velocity is fast, and extraction time approximately shortens 1 times than conventional art;
(3) leaching yield of copper is high, reaches more than 98%, and technical process is short, and equipment is simple;
(4) do not use mineral acid, ammoniacal liquor and ammonium salt solution can form Copper-ammonia Complex with the cupric ion in copper-containing ore or refuse, and selective copper can be leached, leach liquor is purer, and foreign matter content is low, and leaching agent consumption is few;
(5) synergy of hydrogen peroxide and ammoniacal liquor, oxidation reduction reaction, synergistic oxidation is considerably beyond the two independent oxidation effectiveness.
Accompanying drawing explanation
Fig. 1 present invention process schema.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail, but protection scope of the present invention is not limited to described content.
Embodiment 1
Get 10 grams of copper contents be 20.38% cover copper circuit board, below Mechanical Crushing to 200 order; Solid-to-liquid ratio 1:3, whisk device rotating speed 200r/min, temperature of reaction 25 DEG C at, pass into air capacity 12m
3when/h, ammonium chloride concentration 1mol/L, ammoniacal liquor 1 mol/L, open ultrasonic wave, power 60W, adds the hydrogen peroxide of 1L/t every 20min, ultrasound-enhanced Oxidation Leaching 1 hour, and in copper scrap circuit card, the leaching yield of metallic copper is 98.19%.
Embodiment 2
Get 10 grams of copper contents be 20.98% cover copper circuit board, below Mechanical Crushing to 200 order; Solid-to-liquid ratio 1:8, whisk device rotating speed 800r/min, temperature of reaction 25 DEG C at, pass into air capacity 12m
3when/h, ammonium chloride concentration 5mol/L, ammoniacal liquor 4 mol/L, open ultrasonic wave, power 120W, adds the hydrogen peroxide of 3L/t every 20min, ultrasound-enhanced Oxidation Leaching 4 hours; In copper scrap circuit card, the leaching yield of metallic copper is 99.53%.
Embodiment 3
Get 10 grams of copper contents be 19.58% cover copper circuit board, below Mechanical Crushing to 200 order; Solid-to-liquid ratio 1:5, whisk device rotating speed 600r/min, temperature of reaction 25 DEG C at, pass into air capacity 10m
3when/h, ammonium chloride concentration 3mol/L, ammoniacal liquor 2 mol/L, open ultrasonic wave, power 180 W, adds the hydrogen peroxide of 2L/t every 20min, ultrasound-enhanced Oxidation Leaching 2 hours; In copper scrap circuit card, the leaching yield of metallic copper is 98.62%.
Embodiment 4
Get 10 grams of copper contents be 21.58% cover copper circuit board, below Mechanical Crushing to 200 order; Solid-to-liquid ratio 1:3, whisk device rotating speed 200r/min, temperature of reaction 25 DEG C at, pass into air capacity 10m
3when/h, ammonium chloride concentration 5mol/L, ammoniacal liquor 4mol/L, open ultrasonic wave, power 120 W, adds the hydrogen peroxide of 3L/t every 20min, ultrasound-enhanced Oxidation Leaching 4 hours; In copper scrap circuit card, the leaching yield of metallic copper is 99.08%.
Embodiment 5
Get 10 grams of copper contents be 25.18% cover copper circuit board, below Mechanical Crushing to 200 order; Solid-to-liquid ratio 1:8, whisk device rotating speed 800r/min, temperature of reaction 25 DEG C at, pass into air capacity 12m
3when/h, ammonium chloride concentration 1mol/L, ammoniacal liquor 1 mol/L, open ultrasonic wave, power 60 W, adds the hydrogen peroxide of 1L/t every 20min, ultrasound-enhanced Oxidation Leaching 3 hours; In copper scrap circuit card, the leaching yield of metallic copper is 98.28%.
Claims (3)
1. reclaim a method for copper in useless circuit card, it is characterized in that, specifically comprise the following steps:
(1) useless circuit card sample machinery is crushed to is less than 200 orders;
(2) ore pulp is obtained after being mixed with ammonium chloride solution, ammonia soln by useless circuit card powder;
(3) at room temperature, by 10 ~ 12 m
3the speed of/h passes into air, stirs ore pulp, and carries out intensified by ultrasonic wave leaching 1-4h, adds hydrogen peroxide every 20min in the ratio of 1L/t-3L/t in mixing solutions simultaneously.
2. recovery according to claim 1 is given up the method for copper in circuit card, and it is characterized in that: in step (2) described ore pulp, ammonia soln concentration is 1-4mol/L, ammonium chloride solution concentration is 1-5mol/L, solid-to-liquid ratio 1:3-1:8.
3. recovery according to claim 1 is given up the method for copper in circuit card, it is characterized in that: ultrasonic power is 60 ~ 180 W, and stirring velocity is 200-800r/ min, guarantees that particulate matter keeps suspended state.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510114597.7A CN104745824A (en) | 2015-03-17 | 2015-03-17 | Method for recovering copper from waste circuit board |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510114597.7A CN104745824A (en) | 2015-03-17 | 2015-03-17 | Method for recovering copper from waste circuit board |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104745824A true CN104745824A (en) | 2015-07-01 |
Family
ID=53586071
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510114597.7A Pending CN104745824A (en) | 2015-03-17 | 2015-03-17 | Method for recovering copper from waste circuit board |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104745824A (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109609767A (en) * | 2018-12-26 | 2019-04-12 | 北京工业大学 | A kind of waste printed circuit board noble metal based on ultrasonic wave added efficiently separates recovery method |
| CN109777953A (en) * | 2019-03-11 | 2019-05-21 | 刘冠诚 | The low-grade oxidation of one kind and copper-sulphide ores environmental protection recovery process |
| WO2019128863A1 (en) * | 2017-12-30 | 2019-07-04 | 北京工业大学 | Method for circulated chloridized enrichment of noble metals from circuit board molten pool smelted flue dust |
| CN110387472A (en) * | 2019-07-10 | 2019-10-29 | 中国科学院金属研究所 | The method that watery fusion mixes alkali process recycling waste and old circuit board under ultrasonication |
| ES2739880A1 (en) * | 2019-09-24 | 2020-02-04 | Univ Madrid Politecnica | METHOD FOR RECYCLING PRINTED CIRCUIT PLATES (Machine-translation by Google Translate, not legally binding) |
| CN110856857A (en) * | 2018-08-25 | 2020-03-03 | 中节能工程技术研究院有限公司 | Method for ultrasonically treating waste circuit board |
| CN111172398A (en) * | 2020-01-17 | 2020-05-19 | 广东华越环保科技有限公司 | Wet harmless extraction process for metal in waste mobile phone circuit board |
| CN111235401A (en) * | 2020-01-17 | 2020-06-05 | 广东华越环保科技有限公司 | Worn-out mobile phone circuit board bare board gold stripping process |
| CN114317978A (en) * | 2021-12-29 | 2022-04-12 | 扬州伟尔富环保科技有限公司 | Method for recovering micro-nano copper powder from waste printed circuit board |
| CN114934181A (en) * | 2022-04-12 | 2022-08-23 | 中国电器科学研究院股份有限公司 | Method for recycling valuable metals from waste charging pile power devices through wet method |
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2015
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2019128863A1 (en) * | 2017-12-30 | 2019-07-04 | 北京工业大学 | Method for circulated chloridized enrichment of noble metals from circuit board molten pool smelted flue dust |
| US11447845B2 (en) | 2017-12-30 | 2022-09-20 | Beijing University Of Technology | Method for enriching precious metals from printed circuit board incineration ash from molten pool by circulating chlorination |
| CN110856857A (en) * | 2018-08-25 | 2020-03-03 | 中节能工程技术研究院有限公司 | Method for ultrasonically treating waste circuit board |
| CN109609767A (en) * | 2018-12-26 | 2019-04-12 | 北京工业大学 | A kind of waste printed circuit board noble metal based on ultrasonic wave added efficiently separates recovery method |
| CN109777953A (en) * | 2019-03-11 | 2019-05-21 | 刘冠诚 | The low-grade oxidation of one kind and copper-sulphide ores environmental protection recovery process |
| CN110387472A (en) * | 2019-07-10 | 2019-10-29 | 中国科学院金属研究所 | The method that watery fusion mixes alkali process recycling waste and old circuit board under ultrasonication |
| ES2739880A1 (en) * | 2019-09-24 | 2020-02-04 | Univ Madrid Politecnica | METHOD FOR RECYCLING PRINTED CIRCUIT PLATES (Machine-translation by Google Translate, not legally binding) |
| CN111172398A (en) * | 2020-01-17 | 2020-05-19 | 广东华越环保科技有限公司 | Wet harmless extraction process for metal in waste mobile phone circuit board |
| CN111235401A (en) * | 2020-01-17 | 2020-06-05 | 广东华越环保科技有限公司 | Worn-out mobile phone circuit board bare board gold stripping process |
| CN114317978A (en) * | 2021-12-29 | 2022-04-12 | 扬州伟尔富环保科技有限公司 | Method for recovering micro-nano copper powder from waste printed circuit board |
| CN114934181A (en) * | 2022-04-12 | 2022-08-23 | 中国电器科学研究院股份有限公司 | Method for recycling valuable metals from waste charging pile power devices through wet method |
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Application publication date: 20150701 |