CN106381392A - Chemical mineral dressing pretreatment method for waste printed circuit board multi-metal powder - Google Patents
Chemical mineral dressing pretreatment method for waste printed circuit board multi-metal powder Download PDFInfo
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- CN106381392A CN106381392A CN201610867462.2A CN201610867462A CN106381392A CN 106381392 A CN106381392 A CN 106381392A CN 201610867462 A CN201610867462 A CN 201610867462A CN 106381392 A CN106381392 A CN 106381392A
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- circuit board
- copper
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- printed circuit
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/006—Wet processes
- C22B7/008—Wet processes by an alkaline or ammoniacal leaching
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
- B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
- B03B5/00—Washing granular, powdered or lumpy materials; Wet separating
- B03B5/02—Washing granular, powdered or lumpy materials; Wet separating using shaken, pulsated or stirred beds as the principal means of separation
- B03B5/04—Washing granular, powdered or lumpy materials; Wet separating using shaken, pulsated or stirred beds as the principal means of separation on shaking tables
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B15/00—Obtaining copper
- C22B15/0063—Hydrometallurgy
- C22B15/0065—Leaching or slurrying
- C22B15/0067—Leaching or slurrying with acids or salts thereof
- C22B15/0071—Leaching or slurrying with acids or salts thereof containing sulfur
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B25/00—Obtaining tin
- C22B25/04—Obtaining tin by wet processes
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B25/00—Obtaining tin
- C22B25/06—Obtaining tin from scrap, especially tin scrap
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/006—Wet processes
- C22B7/007—Wet processes by acid leaching
-
- 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
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Manufacturing & Machinery (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention provides a chemical mineral dressing pretreatment method for waste printed circuit board multi-metal powder. According to the chemical mineral dressing pretreatment method for the waste printed circuit board multi-metal powder, oxidizing leaching of the waste printed circuit board multi-metal powder is conducted in an alkaline system containing a catalyst through feeding of oxygen, tin is dissolved into a leaching solution in a sodium stannate form, copper is separated from a residual plastic matrix at the same time, and the tin is recycled from the leaching solution through an electro-deposition method; and a copper-enriched object and waste plastic are generated from leaching residues in a shaking table separation manner, and the waste plastic is oxidized and dissolved in a sulfuric acid solution in a potential-controlled manner, so that copper mixed with the waste plastic is completely dissolved. The essence of the chemical mineral dressing pretreatment method for the waste printed circuit board multi-metal powder is that the waste printed circuit board multi-metal powder is treated in the chemical mineral dressing manner combining alkaline pressurized oxidation leaching and shaking table separation, effective removal of the tin and the plastic in the multi-metal powder is achieved at the same time, and high-quality raw materials are provided for following-up recycling of copper. The content of the plastic in the copper-enriched object is smaller than 0.1%, and the environmental pollution caused in the following-up copper recycling process is completely eradicated through the source treatment measure. The content of the copper in the waste plastic is smaller than 0.1%, and dispersed loss of heavy metal and secondary pollution are avoided.
Description
Technical field
The present invention relates to hydrometallurgy process in nonferrous metallurgy field, especially with alkaline pressure oxidation leaching and shaking table
Sort the Wet-process metallurgy method that the chemical mineral processing mode combining processes waste circuit board polymetallic powder.
Background technology
In recent years, electronic enterprises develop rapidly, corresponding waste and old electric electric equipment (waste electric
And electronic equipments or e-wate, WEEE) have become as fastest-rising city mineral products money in the world
Source.It is reported that, global electronic discarded object yield in 2013 is 39,800,000 tons, rises within 2014 41800000 tons it is contemplated that 2018
Year can reach 50,000,000 tons, and annual about 2,000,000 tons of rapid growth will be kept, UN estimate the annual production in the whole world be 2000 ~
50000000 tons, according to estimation, the U.S. had 500,000,000 computers to be scrapped between 1997 to 2007, and the end of the year 2010 are in Japan
610,000,000 computers are had to be eliminated！Statistics shows, annual up to 1.1 million tons in the electron wastes of Chinese output
More than, mostly come from manufacturing industry, scrap household electrical appliances and scrap household electrical appliances from developed country's import.These waste and old electric electric equipments
Core component is old circuit board（PCB, Printed Circuit Board）Although PCB weight only accounts for the 3% of WEEE, but
Containing substantial amounts of valuable metal, this makes the recovery of waste and old electric electric equipment become lucrative.Meanwhile, press from both sides in wiring board again
The noxious material of miscellaneous large amount of complex, its recycling must careful attention！
Old circuit board main source has two aspects, the leftover bits that one side wiring board process produces, board production
During about output 30～50% waste material, be on the other hand the wiring board that waste and old electric electric equipment dismantles, such as family expenses
In electrical equipment computer, TV and phone, the ratio shared by circuit board is respectively 23%, 7% and 11%.Waste printed circuit board mainly contains gold
Genus, plastics and indifferent oxide three major types component altogether, each composition weight constitutes about 40%, 30% and the 30% of wiring board gross weight.Metal
Class component mainly has Cu（20%）、Ni（2%）、Pb（2%）、Sn（4%）、Zn（1%）、Al（6%）、Fe（8%）, Au, Ag, Pt and Pd etc.
Element, each tenor is slightly changed according to circuit board type difference.Organic matter has polyethylene, polypropylene, polyvinyl chloride, gathers
Ester, phenol resin and Merlon etc., indifferent oxide has silica and alundum (Al2O3) etc. it can be seen that waste and old track
Road plate has very high recovery value.In today that primary mineral resources are increasingly exhausted, using waste printed circuit board as secondary resource
Ring recycles, and either processes, reduces the angle of environmental pollution from waste, or from recovery valuable metal, alleviation resource supply and demand
For contradiction, it is respectively provided with important realistic meaning.
The high-efficiency cleaning recycling of waste and old circuit board has become one of emphasis direction of resources circulation area research, gives up
The purpose that old wiring board is processed is to reclaim valuable metal therein, according to the difference of separation and recovery principle, can be by waste and old circuit
The method of plate recycling treatment is divided into burning method, acid extracting, pyrolysismethod and cracking and sorting method etc..Burning method is exactly by waste printed circuit board
Through burning final output blister copper at high temperature, the method has the advantages that process is simple and low cost, but in traditional burning
During, copper is the catalyst that dioxin is formed, and especially makes the speed of bromide fire retardant catalysis formation dioxin faster, so depositing
In serious problem of environmental pollution, the method has been prohibited to adopt.Acid extracting is then that old circuit board is directly used acidity molten
Solution leaches, and finally reclaims valuable metal although process is simple from solution, but there is discharge of wastewater and metal recovery rate is low.
Pyrolysismethod be old circuit board occur under high temperature inert gas or vacuum condition swelling after separate with metal, or heat treatment
Carry out again afterwards pulverizing sorting.Broken comminuting method is to crush to pulverize by wiring board by modes such as impact, extruding and shearings to separate, so
The multi-products such as plastics, glass, iron and many metal dusts are reclaimed out in physical property difference sorting further according to each component afterwards, due to
The depth that similar metals cannot be realized separates, and this technology is generally as the preprocessing means of additive method.Broken comminuting method technique
Be broadly divided into " wet crushing+waterpower separation by shaking table ", " dry milling+dry separation " by with " dry milling+dry and wet sorting " three
Type；The method has that process is simple, processing cost is low and the multiple advantage such as environmental friendliness, unanimously thinks that pulverizing crush method is
Process the most suitable method of old circuit board, and be widely used in the process of old circuit board.
Pulverize in the multi-products that crush method is processed in waste printed circuit board, the recovery value highest of many metal dusts, many metals
Valuable metal therein is typically reclaimed in the process of powder, mainly has wet method and two kinds of techniques of pyrogenic process.Wet processing is using choosing
Selecting property dissolving thinking, different systems add oxidizing dissolving copper, according to leaching agent difference be divided into acidic leaching and
Ammonia leach two kinds, acid system mainly has sulfuric acid, nitric acid and three systems of hydrochloric acid, ammonia gonosome owner to have ammoniacal liquor-ammonium carbonate,
Ammoniacal liquor-ammonium sulfate and three systems of ammoniacal liquor-ammonium nitrate, the application of current sulfuric acid system and ammoniacal liquor-ammonium sulphate system is than wide.
Although wet process can reclaim copper with selective dissolution, poor to the recovering effect of other valuable metals.Pyrometallurgical smelting side
Rule is that many metal dusts are added to the blowing link of copper concentrate pyrometallurgical smelting system or independent reduction melting, output thick
Again through electrorefining output tough cathode, thermal process can fully reclaim the valuable metal in many metal dusts to copper, and technique
Process is simple, so being most widely used method in current industry.
According to knowhow and document report, the many metal dusts of wiring board can bring following problem in pyrometallurgical smelting process：One
Aspect is that the tin in many metal dusts can be dispersed in blister copper, smelting slag and three kinds of products of flue dust in reduction melting process, not only
Lead to tin to be difficult to effectively reclaim, and lead to follow-up electrorefining to be difficult to normally run, make Cathode Copper Quality unqualified；The opposing party
Face is then that the welding resistance oil in many metal dusts can produce toxic and harmful with the substrate of remaining in pyrometallurgical smelting process, brings tight
The risk of environmental pollution of weight, and melting flue gas stink is difficult to eliminate.
Content of the invention
In order to overcome the shortcomings of the presence of old circuit board many metal dusts Several Traditional Preconditioning Methods, the present invention provides one kind to adopt alkali
The chemical mineral processing mode that property pressure oxidation leaching is combined with separation by shaking table processes waste circuit board polymetallic powder, and the tin rate of recovery
High, low cost and the little Wet-process metallurgy method of environmental pollution.
For reaching above-mentioned purpose the technical solution used in the present invention it is：Many metal dusts are in the alkaline system containing catalyst
It is passed through dioxygen oxidation to leach, so that tin is dissolved into into leachate with stannic acid na form, so that copper is separated with remaining plastic substrate simultaneously,
Leachate adopts electrodeposition method to reclaim tin；Leached mud adopts separation by shaking table mode output copper segregation thing and waste plastics respectively again, gives up and moulds
Material controls current potential oxidation dissolution in sulfuric acid solution, so that the copper being mixed in waste plastics is completely dissolved.The essence of the present invention is first
Realize tin in the many metal dusts of old circuit board using alkaline pressure oxidation leaching to be completely dissolved, then adopt oscillating table sorting method
Realize efficiently separating of copper and plastics, finally the copper being mingled with waste plastics is thoroughly removed using control current potential oxidation dissolution mode；This
A little process tight association, separate processes all can not reach the expected effect of old circuit board many metal dusts chemistry ore dressing pretreatment
Really.
Specific technical process and parameter are as follows：
1 alkaline pressure oxidation is leached
Many metal dusts Oxidation Leaching in the high-temperature alkaline solution containing catalyst.Preparation molar concentration is 1.5～3.0mol/L
Sodium hydroxide solution, by liquid-solid ratio（The ratio of liquid volume and solid weight）2～8: the 1 many metal dusts of addition, are simultaneously introduced
The sodium nitrate of many metal dusts weight 0.25～1.0%, as catalyst, mixed slurry is added to Stainless Steel autoclave
In, 150～250 DEG C of controlling reaction temperature is to react 2.0～4.0h under 0.5～1.5MPa with partial pressure of oxygen, lowers the temperature after the completion of reaction
To 75 DEG C and solid-liquor separation, obtain alkaline leaching slag.The main chemical reactions that alkaline pressure oxidation leaching process occurs are as follows：
（1）
2 alkali phase analysis separation by shaking table
Alkaline leaching slag sorts output copper segregation thing and waste plastics in waterpower shaking table.Control alkaline leaching slag particle degree 0.074
Between～5mm, sized mixing with water and so that feed ore concentration is 20～30% and be added on shaking table, keep wash water during 1.5～8 ° of bed surface inclination angle
Consumption is 1.5～3.0t/h, adjusts shaking table stroke and jig frequency is respectively 10～25mm and 240～320 beat/min, separation by shaking table is tied
Shu Hou, concentrate end is copper segregation thing, and mine tailing end is waste plastics.
Control current potential oxidation dissolution：
Waste plastics controls current potential oxidation dissolution copper in sulfuric acid solution.Compound concentration is the sulfuric acid solution of 0.5～1.5mol/L, by liquid
Gu than（The ratio of liquid volume L and solid masses Kg, L/Kg）For the waste plastics of 1～3: 1 addition separation by shaking table output, raise simultaneously
To 75～85 DEG C, then the terminal current potential of control system is addition peroxide under conditions of 200～350mV relative to calomel electrode to temperature
Change hydrogen, continue stirring 1～2h after current potential is stable, then separation of solid and liquid is realized using vacuum filtration mode, leachate reclaims copper,
Leached mud is as the raw material reclaiming waste plastics.The main chemical reactions that the control current potential Oxidation Leaching stage occurs are as follows：
Cu+H2SO4+H2O2=CuSO4+2H2O （2）
The present invention is applied to the many metal dusts processing old circuit board cracking and sorting process output, and its main component scope is with matter
Measuring percentages is respectively（%）：Cu35.0～85.0, Sn2.0～10.0, Pb4.0～18.0, Au10～500g/t and Ag500
～3000g/t.It is also suitable for processing the stanniferous solid material of non-ferrous metal hydrometallurgy process output.
The present invention is compared with waste circuit board polymetallic powder Several Traditional Preconditioning Methods, has the advantage that：1st, the present invention adopts
The chemical mineral processing method that alkaline pressure oxidation leaching is combined with separation by shaking table processes waste circuit board polymetallic powder, realizes simultaneously
Effective removing of tin and plastics in many metal dusts, is that subsequent recovery copper provides quality raw materials；2nd, the present invention is first in high temperature
In sodium hydroxide solution, pressure oxidation is leached, and realizes the efficient removal of tin in waste circuit board polymetallic powder, the removal efficiency of tin reaches
To more than 98.0%, not only achieve effective recovery of tin in many metal dusts, and so that copper is separated with remaining plastic substrate；
3rd, alkaline leaching slag makes the plastic substrate of remnants and copper powders be completely separated through separation by shaking table, and in copper segregation thing, plastic content is little
In 0.1%, prevent the environmental pollution of subsequent recovery copper process using watershed management measure；4th, using control current potential Oxidation Leaching side
Method thoroughly reclaims the copper being mixed in waste plastics, and in waste plastics, the content of copper is less than 0.1%, has prevented the spread loss of heavy metal
And secondary pollution；5th, the present invention has the advantages that technical process technical indicator is stable, labour intensity is little and low production cost.
Brief description
Fig. 1：Present invention process schematic flow sheet.
Specific embodiment
Embodiment 1：
Many metal dusts of certain enterprise's old circuit board cracking and sorting process output domestic, its main component scope is with percent mass
It is respectively than meter（%）：Cu65.0, Sn8.2, Pb9.4, Au50g/t and Ag2500g/t.NaOH and the equal technical grade of sodium nitrate
Reagent, its weight/mass percentage composition is not less than 98.0%.
Prepare the sodium hydroxide solution that molar concentration is 2.5mol/L, by liquid-solid ratio（The ratio of liquid volume and solid weight）
4: the 1 many metal dusts of addition, the sodium nitrate being simultaneously introduced many metal dusts weight 0.4%, as catalyst, mixed slurry is added
To in Stainless Steel autoclave, 175 DEG C of controlling reaction temperature and partial pressure of oxygen are to react 3.0h under 1.0MPa, drop after the completion of reaction
Temperature is more than more than 98.0% to 75 DEG C and solid-liquor separation, the leaching rate of tin；Control alkaline leaching slag dynamics 0.074～2mm it
Between, sized mixing with water and so that feed ore concentration is 25% and be added on shaking table, keep wash water consumption during 5 ° of bed surface inclination angle to be 2.0t/h, adjust
Section shaking table stroke and jig frequency are respectively 15mm and 280 beat/min, and after separation by shaking table terminates, concentrate end is copper segregation thing, and mine tailing end is
Waste plastics.Compound concentration is the sulfuric acid solution of 0.5～1.5mol/L, by liquid-solid ratio（The ratio of liquid volume L and solid masses Kg,
L/Kg）For the waste plastics of 3: 1 addition separation by shaking table outputs, rise high-temperature to 80 DEG C, the then terminal current potential of control system simultaneously
Calomel electrode is addition hydrogen peroxide under conditions of 300mV relatively, continues stirring 1h, then taken out using vacuum after current potential is stable
Filter mode realizes separation of solid and liquid, and leachate reclaims copper, and as the raw material reclaiming waste plastics, in leached mud, copper content is leached mud
0.05%.
Claims (2)
1. a kind of chemical mineral processing preprocess method of the many metal dusts of old circuit board is it is characterised in that comprise the following steps：
（1）Alkaline pressure oxidation is leached
Prepare the sodium hydroxide solution that molar concentration is 1.5～3.0mol/L, by the liquid of liquid volume L and the ratio of solid weight kg
Gu adding many metal dusts than for 2～8: 1, the sodium nitrate being simultaneously introduced many metal dusts weight 0.25～1.0% is as catalysis
Agent, mixed slurry is added in Stainless Steel autoclave, and 150～250 DEG C of controlling reaction temperature and partial pressure of oxygen be 0.5～
React 2.0～4.0h under 1.5MPa, be cooled to 75 DEG C and solid-liquor separation after the completion of reaction, obtain alkaline leaching slag；
（2）Alkali phase analysis separation by shaking table
Alkaline leaching slag Task-size Controlling, between 0.074～5mm, is sized mixing with water and so that feed ore concentration is 20～30% and be added to and shake
On bed, keep wash water consumption during 1.5～8 ° of bed surface inclination angle to be 1.5～3.0t/h, adjust shaking table stroke and jig frequency be respectively 10～
25mm and 240～320 beat/min, after separation by shaking table terminates, concentrate end is copper segregation thing, and mine tailing end is waste plastics；
（3）Control current potential Oxidation Leaching
Compound concentration is the sulfuric acid solution of 0.5～1.5mol/L, and the liquid-solid ratio by liquid volume L and the ratio of solid weight kg is 1
The waste plastics of～3: 1 addition separation by shaking table output, rises high-temperature to 75～85 DEG C, the then terminal current potential phase of control system simultaneously
It is addition hydrogen peroxide under conditions of 200～350mV to calomel electrode, continue stirring 1～2h after current potential is stable, then adopt
Vacuum filtration mode realizes separation of solid and liquid, and leachate reclaims copper, and leached mud is as recovery waste plastics raw material.
2. the method from old circuit board many metal dusts chemistry ore dressing pretreatment as claimed in claim 1 it is characterised in that：
The Contents of Main Components of the many metal dusts of old circuit board is：Cu35.0～85.0%, Sn2.0～10.0%, Pb4.0～18.0%,
Au10～500g/t and Ag500～3000g/t.
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| CN201610867462.2A CN106381392B (en) | 2016-09-30 | 2016-09-30 | A kind of chemical mineral processing preprocess method of the more metal dusts of old circuit board |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108118157A (en) * | 2017-12-30 | 2018-06-05 | 北京工业大学 | Wiring board burns the recovery method of cigarette ash pretreatment and bromine |
| CN112410563A (en) * | 2020-11-02 | 2021-02-26 | 广东臻鼎环境科技有限公司 | Electronic garbage recycling method |
| CN113042508A (en) * | 2021-03-31 | 2021-06-29 | 郑州科技学院 | Electronic technology product processing and recycling device |
| CN113528839A (en) * | 2021-07-26 | 2021-10-22 | 中南大学 | Method for recycling valuable metals from waste circuit board copper powder step by step |
| CN113528841A (en) * | 2021-07-26 | 2021-10-22 | 中南大学 | Method for removing impurity metals from waste circuit board copper powder through ball milling |
| CN113528838A (en) * | 2021-07-26 | 2021-10-22 | 中南大学 | Acid-base combined step-by-step impurity removal method for waste circuit board copper powder |
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| CN102443696A (en) * | 2011-11-15 | 2012-05-09 | 中南大学 | Method for selectively dissolving Cu-Co alloy through catalytic oxidation process |
| CN104328283A (en) * | 2014-11-20 | 2015-02-04 | 中南大学 | Method for extracting copper in waste printed circuit boards by virtue of moderately thermophilic bacteria |
| CN105755289A (en) * | 2016-04-28 | 2016-07-13 | 中南大学 | Method for comprehensively recycling valuable metals of waste circuit board |
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| US6336601B1 (en) * | 1998-12-11 | 2002-01-08 | Matsushita Electric Industrial Co., Ltd. | Method for separating metallic material from waste printed circuit boards, and dry distillation apparatus used for waste treatment |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108118157A (en) * | 2017-12-30 | 2018-06-05 | 北京工业大学 | Wiring board burns the recovery method of cigarette ash pretreatment and bromine |
| WO2019128862A1 (en) * | 2017-12-30 | 2019-07-04 | 北京工业大学 | Method for pretreating incineration ash of circuit board and recovering bromine |
| US11198615B2 (en) | 2017-12-30 | 2021-12-14 | Beijing University Of Technology | Method of pretreatment and bromine recovery of PCB incineration ash |
| CN112410563A (en) * | 2020-11-02 | 2021-02-26 | 广东臻鼎环境科技有限公司 | Electronic garbage recycling method |
| CN113042508A (en) * | 2021-03-31 | 2021-06-29 | 郑州科技学院 | Electronic technology product processing and recycling device |
| CN113042508B (en) * | 2021-03-31 | 2022-06-10 | 郑州科技学院 | Electronic technology product processing and recycling device |
| CN113528839A (en) * | 2021-07-26 | 2021-10-22 | 中南大学 | Method for recycling valuable metals from waste circuit board copper powder step by step |
| CN113528841A (en) * | 2021-07-26 | 2021-10-22 | 中南大学 | Method for removing impurity metals from waste circuit board copper powder through ball milling |
| CN113528838A (en) * | 2021-07-26 | 2021-10-22 | 中南大学 | Acid-base combined step-by-step impurity removal method for waste circuit board copper powder |
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|---|---|
| CN106381392B (en) | 2018-02-06 |
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