CN106756036A - The method that noble metal is reclaimed from waste plastics - Google Patents
The method that noble metal is reclaimed from waste plastics Download PDFInfo
- Publication number
- CN106756036A CN106756036A CN201611113802.9A CN201611113802A CN106756036A CN 106756036 A CN106756036 A CN 106756036A CN 201611113802 A CN201611113802 A CN 201611113802A CN 106756036 A CN106756036 A CN 106756036A
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- CN
- China
- Prior art keywords
- noble metal
- waste plastics
- sulfuric acid
- bakie
- plastic flakes
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Classifications
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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
- C22B7/007—Wet processes by acid leaching
-
- 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
- C22B11/04—Obtaining noble metals by wet processes
- C22B11/042—Recovery of noble metals from waste materials
- C22B11/046—Recovery of noble metals from waste materials from manufactured products, e.g. from printed circuit boards, from photographic films, paper or baths
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- 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)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geology (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The invention provides a kind of method that noble metal is reclaimed from waste plastics, after waste plastics is cut into fragment, is soaked using the concentrated sulfuric acid and stirred, so as to noble metal be stripped down from plastic sheeting, reclaimed.The present invention can not only process the waste plastics of coating surface noble metal, additionally it is possible to which the noble metal in composite membrane is reclaimed in treatment, and method is simple, and easy to operate, sulfuric acid used can be recycled, and the noble metal rate of recovery is high, and low cost is pollution-free.
Description
Technical field
It is more particularly to a kind of from the waste plastics containing precious metal plating the present invention relates to a kind of recovery of metal in waste plastics
The middle method for reclaiming noble metal.
Background technology
The current plastic applications containing the coat of metal are more and more extensive, and the species of its coated metal is also more and more.It is existing
Coat of metal plastics exist two kinds, one kind be the coat of metal in frosting, another is the coat of metal in multilayer build-up
Plastic sheeting between, such as aluminum-plastic composite membrane, this aluminum-plastic composite membrane can substantially be divided into three layers：Internal layer is tack coat, adopts more
With polyethylene or polypropylene material, sealing cementation is played；Intermediate layer is aluminium foil, is prevented from the infiltration of outside batteries steam,
Prevent oozing out for electrolyte inside simultaneously；Outer layer is protective layer, more using dystectic polyester or nylon material, there is very strong machine
Tool performance, prevents damage of the external force to battery, plays a part of to protect battery.In plastic sheeting of the production and processing containing the coat of metal
When also or after its life termination, a large amount of waste materials containing metal can be all produced, wherein being no lack of rich in the waste and old of the noble metals such as gold, platinum
Plastics.Due to adhesion extremely strong between noble metal and film substrate and the chemical property of stabilization, using conventional physical method
Method with chemolysis cannot be efficiently separated.
It is existing that noble metal is reclaimed from the plastics containing precious metal plating, mainly there are two methods.
First, by the way of burning, then noble metal is reclaimed from incineration slag.Such waste material is processed using the method, no
Only energy resource consumption is big, and a large amount of toxic and harmfuls can be produced during burning, causes production environment severe, while
Environmental pollution is caused, on the other hand, during part noble metal can be entrained in flue dust in burning process, so as to cause the damage of noble metal
Lose.
Second, using the method for electrolytic deplating process.Chinese patent CN102251270B discloses a kind of release liner plated surface
The method of the metallic film for covering, the method by electrolysis make metal film surfaces occur evolving hydrogen reaction, so as to by metallic film from
Peeled off on matrix material.It is the method stripping metal film cleaning, quick, and small is injured to matrix material.But for metal
Layer Disjunct distribution or uneven Inorganic Non-metallic Materials or organic material, because its metal surface is discontinuous, in the process of electrolysis
In, metallic film is all peeled off matrix material particularly difficult.And, the method can only process the coat of metal in matrix material table
The situation in face, it is impossible to directly process noble metal composite membrane.
Accordingly, it would be desirable to a kind of new method that noble metal is reclaimed from the waste plastics containing precious metal plating.
The content of the invention
In order to solve the above problems, the invention provides a kind of environmentally friendly effective, economical and energy saving, waste plastics can be completely reclaimed
The method of middle noble metal.
To realize object defined above, the present invention is adopted the following technical scheme that：A kind of method that noble metal is reclaimed from waste plastics,
It comprises the following steps：
Step S1：Waste plastics is cut into plastic flakes；
Step S2：Plastic flakes and the concentrated sulfuric acid are mixed, the noble metal for coming off forms mixed liquor with the concentrated sulfuric acid；
Step S3：The plastic flakes that will be soaked are salvaged and, then mixed liquor is filtered, and obtain noble metal powder and sulfuric acid；
The waste plastics is the waste plastics film containing precious metal plating；
The noble metal is any one or more in gold, platinum, iridium, rhodium.
As a further improvement on the present invention, plastic flakes are the fragment of regular shape in the step S1.
As a further improvement on the present invention, plastic flakes are square or circular chips in the step S1.
As a further improvement on the present invention, the fragment area of the regular shape is 9 ~ 36cm2。
As a further improvement on the present invention, the mass fraction of the concentrated sulfuric acid is 75 ~ 98% in the step S3.
As a further improvement on the present invention, the plastic flakes for coming are salvaged in the step S3 need to be washed, and be returned
Receive the noble metal powder in washing lotion.
As a further improvement on the present invention, the sulfuric acid that the step S3 is obtained is recycled and is added in step S2 or passes through
It is then added in step S2 after distillation water removal.
As a further improvement on the present invention, the concentrated sulfuric acid need to submerge plastic flakes in the step S2.
As a further improvement on the present invention, methods described is carried out in following retracting device：The retracting device includes
At least one cylindrical slot, a tubular bakie, the column trench bottom be a reverse taper, the reverse taper have a discharge nozzle and
One outlet valve, the bakie is placed in cylindrical slot, there is gap between the cylindrical slot and bakie, and the bakie bottom is vertically longitudinal
Some baffle plates are installed, the bottom of the bakie and inwall are provided with some sieve apertures.
The present invention soaks waste plastics using the concentrated sulfuric acid, and applies stirring simultaneously, and the noble metal that will be plated on waste plastics exists
Under churned mechanically external force, stripped down from plastic sheeting, so as to carry out enriching and recovering to noble metal.Process of the present invention letter
Single, easy to operate, sulfuric acid used can be recycled, and metal recovery rate is high, and low cost is pollution-free.
Brief description of the drawings
Fig. 1 is to include a schematic front view for the retracting device of cylindrical slot.
Fig. 2 is to include two schematic front view of the retracting device of cylindrical slot.
Fig. 3 is the schematic top plan view of Fig. 1 retracting devices.
Wherein, 100 be retracting device, 1 be bakie, 2 be cylindrical slot, 11 be baffle plate, 12 be sieve aperture, 21 be reverse taper, 22
For discharge nozzle, 23 are outlet valve.
Specific embodiment
Technical scheme is clearly and completely described below in conjunction with the embodiment of the present invention, it is clear that described implementation
Example is only a part of embodiment of the invention, rather than whole embodiments.Based on the embodiment in the present invention, this area is common
The every other embodiment that technical staff is obtained under the premise of creative work is not made, belongs to the model of present invention protection
Enclose.
The present invention is adopted the following technical scheme that：A kind of method that noble metal is reclaimed from waste plastics, comprises the following steps：
Step S1：Waste plastics is cut into plastic flakes；
Step S2：Plastic flakes and the concentrated sulfuric acid are mixed, the noble metal for coming off forms mixed liquor with the concentrated sulfuric acid；
Step S3：The plastic flakes that will be soaked are salvaged and, then mixed liquor is filtered, and obtain noble metal powder and sulfuric acid；
Waste plastics is the waste plastics film containing precious metal plating；
Noble metal is any one or more in gold, platinum, iridium, rhodium.
In the present invention, waste plastics is the waste plastics film containing precious metal plating, and noble metal is in gold, platinum, iridium, rhodium
Plant or various, precious metal plating can be on single layer plastics films surface or between multilayer complex films.In the present invention, the institute of embodiment 1
It is the PVC laminated films containing gold, platinum mixing coating with waste plastics film, the coat of metal is between the PVC film that two-layer is overlapped.
In the present invention, waste plastics is first cut into plastic flakes, so that noble metal is stripped down.For waste plastics fragment
Shape, it is preferred that plastic flakes are the fragment of regular shape, are more highly preferred to, plastic flakes are square or circular chips.It is right
In the size of plastic flakes, area is excessive, then the time that noble metal is stripped down from plastics is long, and area is too small, plastic flakes
Under the immersion of the concentrated sulfuric acid, easily crimping makes metal-stripping difficult.Preferably, plastic flakes area is 9 ~ 36cm2, it is the most excellent
Choosing, plastic flakes are that area is 9 ~ 36cm2Square fragment.
In the present invention, then plastic flakes are mixed with the concentrated sulfuric acid, the concentrated sulfuric acid of addition should submerge plastic flakes, while entering
Row stirring, the noble metal for coming off forms mixed liquor with the concentrated sulfuric acid.The time of stirring depends on the intensity of stirring, during general stirring
Between be 6 ~ 15h, the mass fraction of the concentrated sulfuric acid is 75 ~ 98%.
In the present invention, after stirring terminates, the plastic flakes that will be soaked are salvaged, and the plastic flakes salvaged are carried out again
Washing, with the noble metal carried secretly in recycled plastic fragment.According to the amount of noble metal powder in mixed liquor, selection continuously adds plastics
Fragment is stirred immersion or directly filtering.Noble metal powder is recycled, the sulfuric acid after filtering by filtering in mixed liquor
Can be added directly into step S2, continue to be used for soaking plastic flakes, if after through repeatedly circulation, moisture increases in sulfuric acid, can
Distilled, go moisture removal, concentrated vitriol to be then added to be recycled in step S2.
In the present invention, make for convenience plastic flakes salvage and noble metal powder be enriched with, to reduce filtration yield, devise with
Lower retracting device 100：Retracting device 100 includes at least one cylindrical slot 2, a tubular bakie 1, and the bottom of cylindrical slot 2 is a back taper
Body 21, reverse taper 21 has a discharge nozzle 22 and an outlet valve 23, and bakie 1 is placed in cylindrical slot 2, cylindrical slot 2 and bakie 1 it
Between have a gap, the vertical longitudinally mounted some baffle plates 11 in the bottom of bakie 1, the bottom of bakie 1 and inwall are provided with some sieve apertures 12.
The concentrated sulfuric acid and plastic flakes are added into bakie 1, is stirred by agitating paddle, the baffle plate 11 of the bottom of bakie 1 can strengthen and stir
Effect is mixed, the noble metal for coming off forms mixed liquor with the concentrated sulfuric acid, after stirring terminates, bakie 1, the concentrated sulfuric acid and your gold for coming off is lifted
Category powder is leak into cylindrical slot 2 from the sieve aperture 12 of bakie 1, and plastic flakes are stayed in bakie 1, are made plastic flakes and are mixed with this
Liquid is separated.Then stand, noble metal powder is sunk, be gathered in the bottom of reverse taper 21 of cylindrical slot 2, open outlet valve 23, make
The noble metal powder of the bottom of reverse taper 21 is released with part of sulfuric acid, and outlet valve 23 is closed immediately, by sulfuric acid and noble metal powder
Mixed liquor is filtered, and obtains noble metal powder, and sulfuric acid can be added in cylindrical slot 2 again, for soaking plastic flakes.This hair
In bright, embodiment 1 uses retracting device 100, carries out noble metal recovery.
In the present invention, after the plastic flakes for soaking are proposed by bakie 1, it is put into another cylindrical slot 2, the stirring that adds water is washed
Wash, to remove the noble metal powder being mingled with plastic flakes, after stirring terminates, lift bakie 1, water lotion and noble metal powder from
Sieve aperture 12 is leak into cylindrical slot 2, and plastic flakes are stayed in bakie 1.Water lotion can be used for multiple times, to water lotion in precious metal powder
When end is more, water lotion is stood, internal noble metal is sunk, be gathered in the bottom of reverse taper 21 of cylindrical slot 2, open outlet valve
23, the noble metal powder of the bottom of reverse taper 21 is released with part water lotion, outlet valve 23 is closed immediately, the water lotion that will be released
Filtered, obtained noble metal powder, the water lotion of filtering can be added in cylindrical slot 2 again, for washing plastic flakes.
The present invention is soaked and stirred using the concentrated sulfuric acid after waste plastics is cut into fragment, so as to by noble metal from modeling
Stripped down on material film, reclaimed.The present invention can not only process the waste plastics of coating surface noble metal, additionally it is possible to reclaim
Noble metal in composite membrane.Composite membrane is soaked by sulfuric acid, and its tack coat is destroyed, and composite membrane is split up into monofilm, while logical
The effect of the concentrated sulfuric acid is crossed, plastic sheeting hardness becomes big, fold occurs, so that there is slight crack in precious metal plating, then in stirring external force
In the presence of, precious metal plating splits away off from waste plastics.
Illustrate below in conjunction with specific embodiments.
Embodiment 1.
The present embodiment treatment waste plastics be：PVC composite membranes containing gold, platinum mixing coating, coating is overlapped in two-layer
Between PVC film.
Retracting device 100 includes two cylindrical slots 2, and a bakie 1, cylindrical slot 2 is diameter 33cm, and 40cm's high is cylindric
Groove；Bakie 1 is the tubular bakie of diameter 30cm, 30cm high, the vertical longitudinally mounted four pieces of baffle plates 11 in the bottom of bakie 1, baffle plate used
11 3cm long, 1.5cm wide, 7cm high, baffle plate 11 are 3cm away from cell wall along the bottom radius direction of bakie 1.Retracting device 100 uses PP
Material.Agitating paddle used is Teflon stir oar, a diameter of 9cm of oar.
1）By the PVC film material containing gold plate, the square fragment that the length of side is 3cm sizes is cut into.
2）200g PVC films fragment and the concentrated sulfuric acid are added in bakie 1 and are mixed, the concentrated sulfuric acid is submerged PVC film broken
Piece, now the concentrated sulfuric acid liquid level is reached at the top 3cm of baffle plate 11, open stirring, stirring 8h after, close stirring.
3）Lift bakie 1, by PVC film chip separation out, then stand, gold, platinum powder end is sunk, be gathered in column
The bottom of reverse taper 21 of groove 2, opens outlet valve 23, the gold of the bottom of reverse taper 21, platinum powder end is released with part of sulfuric acid, closes immediately
Outlet valve 23 is closed, the sulfuric acid of releasing and gold, platinum powder end mixed liquor are filtered, collection obtains gold, platinum mixed-powder, and sulfuric acid can
It is added to again in cylindrical slot 2, for soaking PVC film fragment.
4）Bakie 1 is put into another cylindrical slot 2, add water stirring, the PVC film fragment that washing was soaked, to remove
Gold, the platinum powder end being wherein mingled with, after stirring terminates, propose bakie 1, stand to the reverse taper 21 of gold, platinum powder end deposition cylindrical slot 2
Bottom, opens outlet valve 23, releases cleaning solution, and filtering, recovery obtains gold, platinum mixed-powder.
The rate of recovery up to 99% of the gold and platinum in PVC film coating, gold and platinum is reclaimed by the above method.
Waste plastics film containing precious metal plating is soaked and stirred, by noble metal from modeling by the present invention using the concentrated sulfuric acid
Stripped down on the coating for expecting film, so as to carry out enriching and recovering to noble metal.Process of the present invention is simple, easy to operate, used
Sulfuric acid can be recycled, and metal recovery rate is high, and low cost is pollution-free.
Although being example purpose, the preferred embodiment of the present invention, the ordinary skill people of this area are had been disclosed for
Member will be various to change, it is realized that in the case of scope and spirit of the present invention disclosed in not departing from by appending claims
It is possible for entering, increasing and replacing.
Claims (9)
1. it is a kind of from waste plastics reclaim noble metal method, it is characterised in that comprise the following steps：
Step S1：Waste plastics is cut into plastic flakes；
Step S2：Plastic flakes and the concentrated sulfuric acid are mixed, the noble metal for coming off forms mixed liquor with the concentrated sulfuric acid；
Step S3：The plastic flakes that will be soaked are salvaged and, then mixed liquor is filtered, and obtain noble metal powder and sulfuric acid；
The waste plastics is the waste plastics film containing precious metal plating；
The noble metal is any one or more in gold, platinum, iridium, rhodium.
2. it is according to claim 1 from waste plastics reclaim noble metal method, it is characterised in that in the step S1 mould
Material fragment is the fragment of regular shape.
3. it is according to claim 1 from waste plastics reclaim noble metal method, it is characterised in that in the step S1 mould
Material fragment is square or circular chips.
4. it is according to claim 2 from waste plastics reclaim noble metal method, it is characterised in that the regular shape
Fragment area is 9 ~ 36cm2。
5. it is according to claim 1 from waste plastics reclaim noble metal method, it is characterised in that it is dense in the step S3
The mass fraction of sulfuric acid is 75 ~ 98%.
6. it is according to claim 1 from waste plastics reclaim noble metal method, it is characterised in that beaten in the step S3
Pulling the plastic flakes for coming out need to be washed, and reclaim the noble metal powder in washing lotion.
7. it is according to claim 1 from waste plastics reclaim noble metal method, it is characterised in that the step S3 is obtained
Sulfuric acid recyclable be added in step S2 or be then added in step S2 after distillation water removal.
8. it is according to claim 1 from waste plastics reclaim noble metal method, it is characterised in that it is dense in the step S2
Sulfuric acid need to submerge plastic flakes.
9. it is according to claim 1 from waste plastics reclaim noble metal method, it is characterised in that methods described is following
Carried out in retracting device：The retracting device includes at least one cylindrical slot, a tubular bakie, and the column trench bottom falls for one
Cone, the reverse taper has a discharge nozzle and an outlet valve, and the bakie is placed in cylindrical slot, the cylindrical slot and bakie
Between have a gap, the vertical longitudinally mounted some baffle plates in the bakie bottom, if the bottom of the bakie and inwall are provided with dry screen
Hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611113802.9A CN106756036A (en) | 2016-12-07 | 2016-12-07 | The method that noble metal is reclaimed from waste plastics |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611113802.9A CN106756036A (en) | 2016-12-07 | 2016-12-07 | The method that noble metal is reclaimed from waste plastics |
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| CN106756036A true CN106756036A (en) | 2017-05-31 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201611113802.9A Pending CN106756036A (en) | 2016-12-07 | 2016-12-07 | The method that noble metal is reclaimed from waste plastics |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110306062A (en) * | 2019-08-20 | 2019-10-08 | 中国兵器科学研究院宁波分院 | A kind of method that impulse method extracts precious metal in metal coated plastics |
| CN111057861A (en) * | 2019-11-28 | 2020-04-24 | 中海油太原贵金属有限公司 | Method for recovering precious metal from wire drawing lubricating fluid |
| CN112226941A (en) * | 2020-10-23 | 2021-01-15 | 东台奥力芬化纤有限公司 | Full-automatic inspection device for recovering raw materials in polypropylene fiber air-jet texturing yarn |
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| CN2081766U (en) * | 1989-06-24 | 1991-07-31 | 郭增春 | Separating unit for waste paper-based compound materials |
| CN1464075A (en) * | 2002-06-07 | 2003-12-31 | 中国科学院过程工程研究所 | Process for reclaiming polycarbonate substrate from abandoned optical discs |
| CN1736623A (en) * | 2005-09-07 | 2006-02-22 | 阎骞 | Cladding plastic foil disintegrating and regeneration technology |
| CN103374659A (en) * | 2012-04-25 | 2013-10-30 | 鑫广再生资源(上海)有限公司 | Method for extracting and recovering precious metal and rare metal from wastes |
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2016
- 2016-12-07 CN CN201611113802.9A patent/CN106756036A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2081766U (en) * | 1989-06-24 | 1991-07-31 | 郭增春 | Separating unit for waste paper-based compound materials |
| CN1464075A (en) * | 2002-06-07 | 2003-12-31 | 中国科学院过程工程研究所 | Process for reclaiming polycarbonate substrate from abandoned optical discs |
| CN1736623A (en) * | 2005-09-07 | 2006-02-22 | 阎骞 | Cladding plastic foil disintegrating and regeneration technology |
| CN103374659A (en) * | 2012-04-25 | 2013-10-30 | 鑫广再生资源(上海)有限公司 | Method for extracting and recovering precious metal and rare metal from wastes |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110306062A (en) * | 2019-08-20 | 2019-10-08 | 中国兵器科学研究院宁波分院 | A kind of method that impulse method extracts precious metal in metal coated plastics |
| CN110306062B (en) * | 2019-08-20 | 2021-05-07 | 中国兵器科学研究院宁波分院 | Method for extracting precious metal from metal coating plastic by pulse method |
| CN111057861A (en) * | 2019-11-28 | 2020-04-24 | 中海油太原贵金属有限公司 | Method for recovering precious metal from wire drawing lubricating fluid |
| CN112226941A (en) * | 2020-10-23 | 2021-01-15 | 东台奥力芬化纤有限公司 | Full-automatic inspection device for recovering raw materials in polypropylene fiber air-jet texturing yarn |
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Application publication date: 20170531 |