CN105907970A - Method for recovering copper and lead-tin alloy from scraped automobile radiators - Google Patents
Method for recovering copper and lead-tin alloy from scraped automobile radiators Download PDFInfo
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- CN105907970A CN105907970A CN201610225080.XA CN201610225080A CN105907970A CN 105907970 A CN105907970 A CN 105907970A CN 201610225080 A CN201610225080 A CN 201610225080A CN 105907970 A CN105907970 A CN 105907970A
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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
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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
- C22B13/00—Obtaining lead
- C22B13/04—Obtaining lead by wet processes
- C22B13/045—Recovery from waste materials
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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
- C22B15/00—Obtaining copper
-
- 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
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23F—NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL; MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLIC MATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASS C23 AND AT LEAST ONE PROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25
- C23F1/00—Etching metallic material by chemical means
- C23F1/44—Compositions for etching metallic material from a metallic material substrate of different composition
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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
- C25C1/24—Alloys obtained by cathodic reduction of all their ions
-
- 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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- Engineering & Computer Science (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Electrochemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Electrolytic Production Of Metals (AREA)
- Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
Abstract
A method for recovering copper and lead-tin alloy from scraped automobile radiators comprises the following steps: cleaning the scraped automobile radiators, preparing a lead-tin solder removal liquid, heating and stirring to remove lead-tin alloy, filtering the obtained solution, and electrodepositing the filtered solution to obtain copper radiating fins and lead-tin alloy. The scraped automobile radiators are cleaned to remove adhered oil stains and dusts. The prepared lead-tin solder removal liquid contains 50-260g/L of sodium hydroxide, 5-100g/L of sodium citrate, 5-100g/L of sodium 3-nitrobenzenesulfonate and 20-200g/L of hydrogen peroxide. The heating temperature is 40-100DEG C, and the lead-tin solder removal time is 0.5-3h. The lead-tin solder removed mixed solution is filtered to obtain copper and a lead-tin solution. The lead-tin solution is electrodeposited to obtain the lead-tin alloy. Electrodepositing conditions are as follows: the sodium hydroxide content is 50-200g/L, the sodium acetate content is 40-160g/L, the current density is 10-400A/m<2>, the voltage is 0.5-2.5V, the anode is an insoluble anode, and the cathode is a stainless steel plate. The method has the characteristics of high recovery rate of copper and the lead-tin alloy, short flow and no pollution.
Description
Technical field
The present invention relates to abandoned car radiator and reclaim copper and the method for slicker solder, belong to changing waste into resources field.
Background technology
Auto industry is mainstay of the national economy industry.Nearly ten years, along with developing rapidly of China's economy, vapour
Car consumption figure and recoverable amount sharp increase.State Statistics Bureau shows, by the end of 2014, and China's motor vehicles for civilian use
Owning amount 14598.11 ten thousand.Scrap 5% meter, motor vehicle liquidation amount 729.91 ten thousand in 2014 per year.Scrap
Automobile contains a large amount of red copper and a small amount of plumber's solder etc. through disassembling the radiator obtained, and is reclaimed copper, reviver
The raw material important with secondary tin.
Automobile radiators is that the thin punching press of red copper, lamination, welding obtain, and solder is terne metal (see Fig. 1).
Abandoned car radiator will cause resource value to decline as directly smelted, and the slicker solder response rate is low, a flue gas during smelting huge sum of money
Belong to the problem such as seriously polluted.Green high-efficient removing terne metal is the pass of abandoned car radiator high-valued recovery copper
One of key." a kind of waste and old radiator of water tank disassembles retracting device (application number to Chinese invention patent
201310427234.X) " disclose a kind of waste and old radiator of water tank and disassemble retracting device, including crushing, magnetic separation,
Vibrations sorting, dedusting, feed hopper, discharge bucket and material conveyer belt etc..This invention is not directed to radiator copper strips (paper tinsel)
The technology separated with solder.Chinese invention patent " radiator separator (ZL201110259421.2) " is open
A kind of radiator separator, efficiently solve that labor intensity is big, when wasting time and energy and separate the loss of copper aluminum ask
Topic, but without reference to removing plumber's solder technology.Chinese utility model patent " waste and old radiator remanufacture line
(ZL201320124837.8) " a kind of waste and old radiator remanufacture line is disclosed, including disintegrating machine, conveyer,
Separator, dust arrester etc.." a kind of waste and old radiator of water tank of dry type separates and disassembles back Chinese utility model patent
Receiving unit (ZL201520071432.1) " disclose a kind of waste and old radiator of water tank of dry type and separate and disassemble recovery and set
Standby, including conveyer device, cyclopentane gas detector, hammer mill, sorting conveyer device, vibrations pneumatic separation dress
Put, whirlwind collection aluminum dust arrester, pulsed dust-removing device etc..Chinese invention patent " the side of a kind of copper water tank detin
Method and equipment (application number 201210435861.3) " disclose the method and apparatus of a kind of copper water tank detin.Will
Copper water tank is placed in specific roll, utilizes the difference of different metal fusing point, directly heats cylinder wall extremely
400～500 DEG C of separation realizing copper and tin, but cause scolding tin larger area to be coated in spreader surface.Chinese invention
Patent " method and apparatus (ZL201010279564) of a kind of tin-coated copper rice separation and recovery metal copper and tin " is passed through
The acid solution of copper sulfate, uses method of replacing to realize the separation of copper and stannum.But plumber's solder is removed by this patent
Unfavorable, its reason is copper radiating rib and welding alloy Surface Creation indissoluble thing lead sulfate.
Summary of the invention
The purpose of the present invention mainly solves the copper of abandoned car radiator and the short high level of terne metal flow process reclaims and asks
Topic.
The method that abandoned car radiator of the present invention reclaims copper and terne metal is as follows:
Abandoned car radiator is carried out puts into solution and carries out plumber's solder removing.Solution formula is: hydrogen-oxygen
Change sodium is 50-260g/L, sodium citrate be 5-100g/L, 3-nitrobenzene sodium sulfonate be 5-100g/L, hydrogen peroxide be
20-200g/L.Plumber's solder removing process is: temperature is 40-100 DEG C, the removing time is 0.5-3h.Through removing
The mixed solution of plumber's solder is filtrated to get copper and slicker solder solution.Slicker solder solution electrodeposition obtains terne metal.Electrodeposition
Technique is: sodium hydroxide is 50-200g/L, sodium acetate is 40-160g/L, electric current density is 10-400A/m2、
Voltage is 0.5-2.5V, anode is insoluble anode, negative electrode is corrosion resistant plate.
The present invention utilizes 3-nitrobenzene sodium sulfonate to contain oxide group [-NO2], its oxidisability compares HNO3Weak, instead
[-NO during Ying2] metal oxygen not only can be melted into ion, but also reason oxidisability is not too strong and the feature of etched the matrix.
After oxidized reduction reaction, [-NO2] it is reduced into [-NO].For improving response speed, sodium citrate complexing agent,
Forming stable complex with slicker solder ion, make the ionic activity of slicker solder in solution decline, equilibrium potential is negative to be moved,
Accelerated oxidation.Reaction principle is as follows:
2C6H4O5NSNa+Pb+Sn→2C6H4O4NSNa+PbO+SnO
SnO+2NaOH+H2O→Na2[Sn(OH)4]
PbO+2NaOH→Na2PbO2+H2O
2Na3C6H5O7·2H2O+3Na2PbO2+6H2O→3Pb·2(C6H5O7)+12NaOH
Total reaction is as follows:
2Na3C6H5O7·2H2O+6C6H4O5NSNa+3Pb+3Sn+6H2O→6C6H4O4NSNa+3Na2[Sn(OH)4]
+3Pb·2(C6H5O7)
Compared with prior art, owing to the present invention has, the response rate of copper is high, simple for process, cheaper starting materials
The features such as nontoxic, heavy metal free gas discharge.
Accompanying drawing explanation
Fig. 1 abandoned car radiator reclaims the process chart of copper
Detailed description of the invention
Below in conjunction with embodiment, the invention will be further described, but the present invention is not only limited to following example.
Embodiment 1
Abandoned car radiator is carried out, and removes greasy dirt and the dust of its attachment.Configuration plumber's solder removing liquid,
Sodium hydroxide is 50g/L, sodium citrate be 5g/L, 3-nitrobenzene sodium sulfonate be 5g/L, hydrogen peroxide be 20g/L.
Abandoned car radiator is heated and stirred in plumber's solder removing liquid, and temperature is 100 DEG C, and the removing time is 0.5h.
It is filtrated to get copper and slicker solder solution through removing the mixed solution of plumber's solder.Slicker solder solution is hydrogen-oxygen through composition adjustment
After change sodium 50g/L, sodium acetate are 40g/L, carrying out electrodeposition under the conditions of alkalescence, electric current density is 10A/m2, electricity
Pressure is 2.5V, anode is graphite, negative electrode is corrosion resistant plate.Terne metal is being deposited on stainless steel cathode plate,
Stripped obtain terne metal.
Embodiment 2
Abandoned car radiator is carried out, and removes greasy dirt and the dust of its attachment.Configuration plumber's solder removing liquid,
Sodium hydroxide is 75g/L, sodium citrate be 15g/L, 3-nitrobenzene sodium sulfonate be 15g/L, hydrogen peroxide be 30g/L.
Abandoned car radiator is heated and stirred in plumber's solder removing liquid, and temperature is 90 DEG C, and the removing time is 1.0h.
It is filtrated to get copper and slicker solder solution through removing the mixed solution of plumber's solder.Slicker solder solution is hydrogen-oxygen through composition adjustment
After change sodium 75g/L, sodium acetate are 60g/L, carrying out electrodeposition under the conditions of alkalescence, electric current density is 50A/m2, electricity
Pressure is 2.0V, anode is titanium rod, negative electrode is corrosion resistant plate.Terne metal is being deposited on stainless steel cathode plate,
Stripped obtain terne metal.
Embodiment 3
Abandoned car radiator is carried out, and removes greasy dirt and the dust of its attachment.Configuration plumber's solder removing liquid,
Sodium hydroxide is 100g/L, sodium citrate be 25g/L, 3-nitrobenzene sodium sulfonate be 25g/L, hydrogen peroxide be 50g/L.
Abandoned car radiator is heated and stirred in plumber's solder removing liquid, and temperature is 80 DEG C, and the removing time is 2.0h.
It is filtrated to get copper and slicker solder solution through removing the mixed solution of plumber's solder.Slicker solder solution is hydrogen-oxygen through composition adjustment
After change sodium 100g/L, sodium acetate are 80g/L, carrying out electrodeposition under the conditions of alkalescence, electric current density is 100A/m2、
Voltage is 1.5V, anode is titanium rod, negative electrode is corrosion resistant plate.Terne metal is being deposited on stainless steel cathode plate,
Stripped obtain terne metal.
Embodiment 4
Abandoned car radiator is carried out, and removes greasy dirt and the dust of its attachment.Configuration plumber's solder removing liquid,
Sodium hydroxide is 125g/L, sodium citrate be 50g/L, 3-nitrobenzene sodium sulfonate be 50g/L, hydrogen peroxide be 75g/L.
Abandoned car radiator is heated and stirred in plumber's solder removing liquid, and temperature is 70 DEG C, and the removing time is 1.5h.
It is filtrated to get copper and slicker solder solution through removing the mixed solution of plumber's solder.Slicker solder solution is hydrogen-oxygen through composition adjustment
After change sodium 125g/L, sodium acetate are 100g/L, carrying out electrodeposition under the conditions of alkalescence, electric current density is 150A/m2、
Voltage is 1.0V, anode is graphite, negative electrode is corrosion resistant plate.Terne metal is being deposited on stainless steel cathode plate,
Stripped obtain terne metal.
Embodiment 5
Abandoned car radiator is carried out, and removes greasy dirt and the dust of its attachment.Configuration plumber's solder removing liquid,
Sodium hydroxide is 150g/L, sodium citrate be 75g/L, 3-nitrobenzene sodium sulfonate be 60g/L, hydrogen peroxide be 100g/L.
Abandoned car radiator is heated and stirred in plumber's solder removing liquid, and temperature is 60 DEG C, and the removing time is 1.0h.
It is filtrated to get copper and slicker solder solution through removing the mixed solution of plumber's solder.Slicker solder solution is hydrogen-oxygen through composition adjustment
After change sodium 150g/L, sodium acetate are 120g/L, carrying out electrodeposition under the conditions of alkalescence, electric current density is 200A/m2、
Voltage is 1.0V, anode is platinum sheet, negative electrode is corrosion resistant plate.Terne metal is being deposited on stainless steel cathode plate,
Stripped obtain terne metal.
Embodiment 6
Abandoned car radiator is carried out, and removes greasy dirt and the dust of its attachment.Configuration plumber's solder removing liquid,
Sodium hydroxide is 175g/L, sodium citrate be 100g/L, 3-nitrobenzene sodium sulfonate be 75g/L, hydrogen peroxide be
120g/L.Abandoned car radiator is heated and stirred in plumber's solder removing liquid, and temperature is 50 DEG C, removes the time
For 0.5h.It is filtrated to get copper and slicker solder solution through removing the mixed solution of plumber's solder.Slicker solder solution is adjusted through composition
Whole be 140g/L for sodium hydroxide 175g/L, sodium acetate after, carry out electrodeposition under the conditions of alkalescence, electric current density is
260A/m2, voltage be 1.0V, anode be platinum sheet, negative electrode be corrosion resistant plate.Terne metal be deposited on stainless
On steel minus plate, stripped obtain terne metal.
Embodiment 7
Abandoned car radiator is carried out, and removes greasy dirt and the dust of its attachment.Configuration plumber's solder removing liquid,
Sodium hydroxide is 200g/L, sodium citrate be 90g/L, 3-nitrobenzene sodium sulfonate be 100g/L, hydrogen peroxide be
150g/L.Abandoned car radiator is heated and stirred in plumber's solder removing liquid, and temperature is 40 DEG C, removes the time
For 0.5h.It is filtrated to get copper and slicker solder solution through removing the mixed solution of plumber's solder.Slicker solder solution is adjusted through composition
Whole be 160g/L for sodium hydroxide 200g/L, sodium acetate after, carry out electrodeposition under the conditions of alkalescence, electric current density is
300A/m2, voltage be 0.5V, anode be graphite, negative electrode be corrosion resistant plate.Terne metal be deposited on stainless
On steel minus plate, stripped obtain terne metal.
Embodiment 8
Abandoned car radiator is carried out, and removes greasy dirt and the dust of its attachment.Configuration plumber's solder removing liquid,
Sodium hydroxide is 230g/L, sodium citrate be 100g/L, 3-nitrobenzene sodium sulfonate be 90g/L, hydrogen peroxide be
175g/L.Abandoned car radiator is heated and stirred in plumber's solder removing liquid, and temperature is 55 DEG C, removes the time
For 1.0h.It is filtrated to get copper and slicker solder solution through removing the mixed solution of plumber's solder.Slicker solder solution is adjusted through composition
Whole be 150g/L for sodium hydroxide 180g/L, sodium acetate after, carry out electrodeposition under the conditions of alkalescence, electric current density is
340A/m2, voltage be 0.5V, anode be titanium rod, negative electrode be corrosion resistant plate.Terne metal be deposited on stainless
On steel minus plate, stripped obtain terne metal.
Embodiment 9
Abandoned car radiator is carried out, and removes greasy dirt and the dust of its attachment.Configuration plumber's solder removing liquid,
Sodium hydroxide is 260g/L, sodium citrate be 60g/L, 3-nitrobenzene sodium sulfonate be 80g/L, hydrogen peroxide be 200g/L.
Abandoned car radiator is heated and stirred in plumber's solder removing liquid, and temperature is 75 DEG C, and the removing time is 1.5h.
It is filtrated to get copper and slicker solder solution through removing the mixed solution of plumber's solder.Slicker solder solution is hydrogen-oxygen through composition adjustment
After change sodium 200g/L, sodium acetate are 130g/L, carrying out electrodeposition under the conditions of alkalescence, electric current density is 360A/m2、
Voltage is 1.5V, anode is graphite, negative electrode is corrosion resistant plate.Terne metal is being deposited on stainless steel cathode plate,
Stripped obtain terne metal.
Embodiment 10
Abandoned car radiator is carried out, and removes greasy dirt and the dust of its attachment.Configuration plumber's solder removing liquid,
Sodium hydroxide is 160g/L, sodium citrate be 60g/L, 3-nitrobenzene sodium sulfonate be 30g/L, hydrogen peroxide be 135g/L.
Abandoned car radiator is heated and stirred in plumber's solder removing liquid, and temperature is 65 DEG C, and the removing time is 2.0h.
It is filtrated to get copper and slicker solder solution through removing the mixed solution of plumber's solder.Slicker solder solution is hydrogen-oxygen through composition adjustment
After change sodium 190g/L, sodium acetate are 100g/L, carrying out electrodeposition under the conditions of alkalescence, electric current density is 380A/m2、
Voltage is 1.5V, anode is platinum sheet, negative electrode is corrosion resistant plate.Terne metal is being deposited on stainless steel cathode plate,
Stripped obtain terne metal.
Embodiment 11
Abandoned car radiator is carried out, and removes greasy dirt and the dust of its attachment.Configuration plumber's solder removing liquid,
Sodium hydroxide is 90g/L, sodium citrate be 40g/L, 3-nitrobenzene sodium sulfonate be 40g/L, hydrogen peroxide be 160g/L.
Abandoned car radiator is heated and stirred in plumber's solder removing liquid, and temperature is 55 DEG C, and the removing time is 3.0h.
It is filtrated to get copper and slicker solder solution through removing the mixed solution of plumber's solder.Slicker solder solution is hydrogen-oxygen through composition adjustment
After change sodium 160g/L, sodium acetate are 90g/L, carrying out electrodeposition under the conditions of alkalescence, electric current density is 400A/m2、
Voltage is 2.0V, anode is graphite, negative electrode is corrosion resistant plate.Terne metal is being deposited on stainless steel cathode plate,
Stripped obtain terne metal.
Embodiment 12
Abandoned car radiator is carried out, and removes greasy dirt and the dust of its attachment.Configuration plumber's solder removing liquid,
Sodium hydroxide is 60g/L, sodium citrate be 30g/L, 3-nitrobenzene sodium sulfonate be 55g/L, hydrogen peroxide be 60g/L.
Abandoned car radiator is heated and stirred in plumber's solder removing liquid, and temperature is 75 DEG C, and the removing time is 3.0h.
It is filtrated to get copper and slicker solder solution through removing the mixed solution of plumber's solder.Slicker solder solution is hydrogen-oxygen through composition adjustment
After change sodium 140g/L, sodium acetate are 50g/L, carrying out electrodeposition under the conditions of alkalescence, electric current density is 280A/m2、
Voltage is 2.5V, anode is titanium rod, negative electrode is corrosion resistant plate.Terne metal is being deposited on stainless steel cathode plate,
Stripped obtain terne metal.
Claims (3)
1. the method that an abandoned car radiator copper and terne metal reclaim, it is characterised in that: include scrapping
Automobile radiators is carried out, configures plumber's solder removing liquid, heated and stirred deleading ashbury metal, filtration, electrodeposition,
Obtain copper radiating rib and terne metal.
The method that abandoned car radiator copper the most according to claim 1 and terne metal reclaim, it is special
Levy and be: plumber's solder removing liquid composition is: sodium hydroxide is 50-260g/L, and sodium citrate is 5-100g/L,
3-nitrobenzene sodium sulfonate is 5-100g/L, and hydrogen peroxide is 20-200g/L；Plumber's solder removing process is: heating
Temperature is 40-100 DEG C, and the removing time is 0.5-3h.
The method that abandoned car radiator copper the most according to claim 1 and terne metal reclaim, it is special
Levy and be: slicker solder solution electrodeposition process is: sodium hydroxide is 50-200g/L, and sodium acetate is 40-160g/L, electricity
Current density is 10-400A/m2, voltage is 0.5-2.5V, and insoluble anode is graphite, titanium and platinum.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610225080.XA CN105907970B (en) | 2016-04-12 | 2016-04-12 | A kind of method of abandoned car radiator recovery copper and terne metal |
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| CN201610225080.XA CN105907970B (en) | 2016-04-12 | 2016-04-12 | A kind of method of abandoned car radiator recovery copper and terne metal |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1171656A (en) * | 1966-02-25 | 1969-11-26 | Mini Ind Chimice | Process for obtaining indium and tin from raw lead |
| CN102676822A (en) * | 2011-03-11 | 2012-09-19 | 深圳市格林美高新技术股份有限公司 | Burning-free non-cyaniding method for treating waste printed circuit board |
-
2016
- 2016-04-12 CN CN201610225080.XA patent/CN105907970B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1171656A (en) * | 1966-02-25 | 1969-11-26 | Mini Ind Chimice | Process for obtaining indium and tin from raw lead |
| CN102676822A (en) * | 2011-03-11 | 2012-09-19 | 深圳市格林美高新技术股份有限公司 | Burning-free non-cyaniding method for treating waste printed circuit board |
Non-Patent Citations (1)
| Title |
|---|
| 朱东晖: ""铜及不锈钢基材上锡/锡-铅合金电镀层的退除"", 《电镀与精饰》 * |
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