CN107419103B - A kind of recycling processing method of discarded varistor - Google Patents
A kind of recycling processing method of discarded varistor Download PDFInfo
- Publication number
- CN107419103B CN107419103B CN201710599732.0A CN201710599732A CN107419103B CN 107419103 B CN107419103 B CN 107419103B CN 201710599732 A CN201710599732 A CN 201710599732A CN 107419103 B CN107419103 B CN 107419103B
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- CN
- China
- Prior art keywords
- varistor
- scolding tin
- discarded
- silver
- recycling
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Classifications
-
- 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
-
- 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
- C22B11/00—Obtaining noble metals
- C22B11/02—Obtaining noble metals by dry processes
- C22B11/021—Recovery of noble metals from waste materials
- C22B11/025—Recovery of noble metals from waste materials from manufactured products, e.g. from printed circuit boards, from photographic films, paper, or baths
-
- 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
-
- 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
Abstract
The invention discloses a kind of recycling processing methods of discarded varistor, belong to Disposal of Electronic Wastes and utilize technical field.Technical scheme of the present invention main points are：A kind of recycling processing method of discarded varistor, including solvent mixing flows away insulated paint skin, Fluid nitrogen cryopreservation mechanical collision removal dilval silk and scolding tin and high temperature scrapes scrape along reciprocating screen point recycling silver bits.Without the discharge for burning pollutant, acid-bearing wastewater, heavy metal ion-containing waste water and waste residue in implementation process of the present invention, and whole process is energized without fuel combustion, it is more energy-saving and environmentally friendly, and technique fining degree, the comprehensive output value and input-output ratio are much higher by conventional processes.
Description
Technical field
The invention belongs to Disposal of Electronic Wastes to utilize technical field, and in particular to a kind of resource of discarded varistor
Change processing method.
Background technology
Piezoresistor is a kind of resistance device with nonlinear wind vibration, and construction is usually in smooth high temperature
Sintered ceramic substrate two sides is silver-plated, reuses electronics scolding tin and copper-plated iron-nickel alloy wire is welded on two sides, apply last layer later
Polymer insulation coating.Piezoresistor is because of its good nonlinear wind vibration, without discharging gap, when overvoltage acts on,
Resistance drastically declines, and overvoltage of releasing energy reaches protecting effect.
Piezoresistor belongs to power electronic element medical disposable material, since the invention, is widely used in electric supply system
System, protection system of electric motor, automobile electronic system and power electronic product lightning-protection system etc., yield and usage amount are huge, China
The defective work of annual production link generation and the piezoresistor weight under dismantling have thousands of tons of.Contain in discarded piezoresistor
Valuable considerable noble silver, scolding tin and the dedicated nanometer resistance material of varistor have higher recycling valence
Value.
For a long time, China is referred to as electronic waste processing to the recovery operation of such electronic component, and industry is main
Guangdong Chao-Shan Area, Xiangxi area, Jiangsu and Zhejiang Provinces area etc. are concentrated on, industry characteristics are often scale is smaller, practitioner
Levels of culture and technical merit are relatively low, treatment process is extensive, high energy consumption, seriously polluted small workshop mode factory, to pressure-sensitive electricity
The recycling of resistance device usually carries out technological process as shown in Figure 1.
There is many drawbacks in above-mentioned technological process：The mode for burning removal insulation coat of paint is enforced the law by Environmental Protection in China already
Department, which orders, to be forbidden, and a large amount of operations for carrying out burning disposal belong to illegal or even criminal offence；High temperature removes scolding tin generally use
The mode for directly heating baking even calcination stir-fry refining carries out, and such mode is simply extensive, and scolding tin removal is insufficient, and silver also has
Loss；Silver-colored pickling then uses factory's waste nitric acid to carry out, and precipitating reagent uses sodium chloride, obtained thick galactic longitude to be carried out after crossing plate-frame filtering
Calcination obtains thick silver, this will produce a certain amount of acid waste water containing heavy metal ion, nitrogen oxides, hydrogen chloride in the process
Deng endangering operator's health and seriously pollute ambient enviroment.With the gradual perfection and law enforcement power of China's environmental law regulation
The continuous reinforcement of degree, the technique that raw material are recycled from piezoresistor need further research and development and improve.
Invention content
The technical problem to be solved by the present invention is to provide it is a kind of it is simple for process, of low cost, the environmental-friendly and rate of recovery is high
Discarded varistor recycling processing method.
The present invention adopts the following technical scheme that solve above-mentioned technical problem, a kind of recycling treatment of discarded varistor
Method, it is characterised in that detailed process is：
（1）Varistor after washes clean and drying is placed in outer barrel sealing and stainless steel drum of the inner cylinder with mesh
In, solvent refluxing washing is carried out under rotation status, the raw material which is matched by following weight percent compounds：N- methyl pyrroles
Pyrrolidone 30%-40%, propylene glycol methyl ether acetate or/and propylene glycol monomethyl ether butyrate 10%-20%, 120#Petroleum ether 20%-30%
With methyl cyclohexyl 10%-20%, solvent is heated to 160-200 DEG C using circulating heat conduction oil and flows back, by withdrawing fluid and
High-temperature steam persistently cleans the varistor stirred so that surface insulation coat of paint, which is constantly washed, to gutter down back
It receives and utilizes；
（2）Varistor and liquid nitrogen after removal surface coat of paint are added in double-layer seal Horizontal stirring roller, welds at this time
In tin with alloy iron bar contact portion tin because under condition of ultralow temperature crystalline form become fragile, start mixing drum and be stirred, become fragile
Scolding tin adhesive effect variation constantly torn and shock falls off, when mechanical agitation so that by adding liquid when temperature of charge increases
The mode of nitrogen cools down again until scolding tin is completely fallen off, and then dilval silk is recycled by way of magnetic separation separation, then by shaking
The mode for swinging screening recycles scolding tin slag and re-melts and recycled；
（3）Varistor after removal scolding tin is placed in top to be equipped in the reciprocating vibration sieve of infrared heating pipe, this is past
The sieve plate of compound vibrating screen and the contact surface of varistor are hard abrasive material matte, and semicircle is evenly distributed on sieve plate
Varistor is heated to 800-900 DEG C by protrusion by infrared heating pipe, this is pressure-sensitive under vibrating screen reciprocal horizontal effect of vibration
Resistance substrate surface constantly rubs with the horizontal matte of sieve plate, and varistor automatic turning under the action of semi-cylindrical hill
Face, it is heated soften it is silver-plated fall off and hit into silver bits sieve, recycle, silver, which is considered to be worth doing, melt freshening and obtains thick silver ingot.
The present invention has the advantages that compared with prior art：
1, the discharge without burning pollutant, acid-bearing wastewater, heavy metal ion-containing waste water and waste residue in implementation process of the present invention,
And whole process is energized without fuel combustion, is more energy-saving and environmentally friendly compared with traditional approach；
2, the processing method that this programme is selected is by being divided on the basis of analysis varistor each section material character
Class recycles, and the almost unchanged raw material property of method of selection, the raw material of recycling do not change the chemical property of original raw material,
Processing method science embodies renewable resource recycling thought；
3, the processing means mechanization degree that the present invention uses is high, and instrument used can use market versatile material as needed
It designs and produces, and operation labor intensive is few, it is of less demanding to operating personnel's profession, it is used suitable for the enterprise of a variety of scales；
4, recycling silver-colored in the present invention, because without overpickling reprecipitation process, the rate of recovery is high, the scolding tin that freezing separation obtains
Slag, weight are far more than silver, it is only necessary to and it is i.e. recyclable after re-melting, it is special even can be re-used as resistance directly as common scolding tin
It is used with scolding tin, economic value is objective, and macromolecule coat of paint slurry can be used as virgin material reuse by suitably compounding adjustment, or be used as
The compounding of other coatings, can also create certain profit, and fining degree, the comprehensive output value and input-output ratio are much high
Go out conventional processes.
Description of the drawings
Fig. 1 is the conventional processes flow chart of discarded varistor；
Fig. 2 is the recycling treatment process flow chart of the discarded varistor of the present invention.
Specific implementation mode
The above of the present invention is described in further details by the following examples, but this should not be interpreted as to this
The range for inventing above-mentioned theme is only limitted to embodiment below, and all technologies realized based on the above of the present invention belong to this hair
Bright range.
Embodiment
After washed drying, backwashing washing, mixing are carried out using 300Kg mixed solvents for the belt leather reclaimed materials of 200Kg
The proportioning of solvent is as follows：N-Methyl pyrrolidone 120Kg, propylene glycol monomethyl ether butyrate 50Kg, methyl cyclohexyl 50Kg and 120#
Petroleum ether 80Kg, to 160 DEG C of reflux until reclaimed materials becomes rubber cement completely, rubber cement carried out oil bath heating mixed solvent while hot
Filter, the laggard sand mill grinding of cooling, it is 40% to adjust solid content, is sealed and stored for use, and what is obtained washes away the material weight of insulation coat of paint
147Kg, into next step process；
The double seal Horizontal stirring roller with safety air release valve is added in 147Kg removal insulated paint claddings, is added
6Kg liquid nitrogen rear enclosed Horizontal stirring rollers stand 20min, then stir 60min, then add 3Kg liquid nitrogen, closing stirring 40min,
Liquid nitrogen 3Kg is added later, and closing stirring 1h dischargings are sifted out scruff through shaking screen and collected, dilval is separated through Magneto separate
Silk, it is weighed to obtain 2.26Kg scolding tin and 23.74Kg dilval silks, clout residue 121.2Kg；
Varistor after removal scolding tin is placed in top to be equipped in the reciprocating vibration sieve of infrared heating pipe, this is reciprocating
The sieve plate of vibrating screen and the contact surface of varistor are hard abrasive material matte, are evenly distributed on sieve plate semicircle convex
It rises, opening reciprocating vibration sieve makes infrared heating pipe heat temperature raising, starts simultaneously at reciprocating motion, and the control of sieve plate temperature is 800 DEG C,
About 870 DEG C of material temperature sieves parchment covering after 80min and becomes silver bits and takes off and sieve completely, and the silver bits after screening are through collecting ingot casting again
Obtain thick silver ingot 876g, resistance substrate material residue 120Kg that purity is 91.4%.
Embodiment above describes the basic principles and main features and advantage of the present invention, and the technical staff of the industry should
Understand, the present invention is not limited to the above embodiments, and the above embodiments and description only describe the originals of the present invention
Reason, under the range for not departing from the principle of the invention, various changes and improvements may be made to the invention, these changes and improvements are each fallen within
In the scope of protection of the invention.
Claims (2)
1. a kind of recycling processing method of discarded varistor, it is characterised in that detailed process is：
（1）Varistor after washes clean and drying is placed in outer barrel sealing and stainless steel drum of the inner cylinder with mesh, rotation
Turn to carry out solvent refluxing washing under state, the raw material which is matched by following weight percent compounds：N- crassitudes
Ketone 30%-40%, propylene glycol methyl ether acetate or/and propylene glycol monomethyl ether butyrate 10%-20%, 120#Petroleum ether 20%-30% and first
Base cyclohexyl 10%-20%, solvent are heated to 160-200 DEG C using circulating heat conduction oil and flow back, and pass through withdrawing fluid and high temperature
Steam persistently cleans the varistor stirred so that surface insulation coat of paint, which is constantly washed to gutter down, is able to recycling profit
With；
（2）Varistor and liquid nitrogen after removal surface coat of paint are added in double-layer seal Horizontal stirring roller, at this time in scolding tin
With dilval silk contact portion tin because under condition of ultralow temperature crystalline form become fragile, start mixing drum and be stirred, become fragile
Scolding tin adhesive effect variation is constantly torn and shock falls off, when mechanical agitation so that by adding liquid nitrogen when temperature of charge increases
Mode cool down again until scolding tin is completely fallen off, then recycle dilval silk by way of magnetic separation separation, then pass through oscillation
The mode of screening recycles scolding tin slag and re-melts and recycled；
（3）Varistor after removal scolding tin is placed in top to be equipped in the reciprocating vibration sieve of infrared heating pipe, this is reciprocating
The sieve plate of vibrating screen and the contact surface of varistor are hard abrasive material matte, are evenly distributed on sieve plate semicircle convex
It rises, varistor is heated to 800-900 DEG C by infrared heating pipe, the pressure-sensitive electricity under vibrating screen reciprocal horizontal effect of vibration
Resistance substrate surface constantly rubs with the horizontal matte of sieve plate, and varistor automatic turning under the action of semi-cylindrical hill
Face, it is heated soften it is silver-plated fall off and hit into silver bits sieve, recycle, silver, which is considered to be worth doing, melt freshening and obtains thick silver ingot.
2. the recycling processing method of discarded varistor according to claim 1, it is characterised in that：Step（1）In
Solvent is compounded by the raw material of following weight：N-Methyl pyrrolidone 120Kg, propylene glycol monomethyl ether butyrate 50Kg, methyl ring
Own ester 50Kg and 120#Petroleum ether 80Kg.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710599732.0A CN107419103B (en) | 2017-07-21 | 2017-07-21 | A kind of recycling processing method of discarded varistor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710599732.0A CN107419103B (en) | 2017-07-21 | 2017-07-21 | A kind of recycling processing method of discarded varistor |
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| Publication Number | Publication Date |
|---|---|
| CN107419103A CN107419103A (en) | 2017-12-01 |
| CN107419103B true CN107419103B (en) | 2018-10-23 |
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|---|---|---|---|
| CN201710599732.0A Active CN107419103B (en) | 2017-07-21 | 2017-07-21 | A kind of recycling processing method of discarded varistor |
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| Country | Link |
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| CN (1) | CN107419103B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101417284A (en) * | 2008-12-09 | 2009-04-29 | 中南大学 | Recovery method of waste circuit board value resource |
| CN101423898A (en) * | 2008-12-03 | 2009-05-06 | 中南大学 | Recovery method of waste circuit board |
| CN103397195A (en) * | 2013-08-09 | 2013-11-20 | 内蒙古科技大学 | Recovery device and recovery method of metallic copper of waste printed circuit board |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01225730A (en) * | 1988-03-03 | 1989-09-08 | Tanaka Kikinzoku Kogyo Kk | Method for recovering ruthenium from ruthenium resistant body |
-
2017
- 2017-07-21 CN CN201710599732.0A patent/CN107419103B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101423898A (en) * | 2008-12-03 | 2009-05-06 | 中南大学 | Recovery method of waste circuit board |
| CN101417284A (en) * | 2008-12-09 | 2009-04-29 | 中南大学 | Recovery method of waste circuit board value resource |
| CN103397195A (en) * | 2013-08-09 | 2013-11-20 | 内蒙古科技大学 | Recovery device and recovery method of metallic copper of waste printed circuit board |
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| Publication number | Publication date |
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| CN107419103A (en) | 2017-12-01 |
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