CN105177608B - A kind of waste and old aluminum easy open can efficient green stripping method - Google Patents
A kind of waste and old aluminum easy open can efficient green stripping method Download PDFInfo
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- CN105177608B CN105177608B CN201510656296.7A CN201510656296A CN105177608B CN 105177608 B CN105177608 B CN 105177608B CN 201510656296 A CN201510656296 A CN 201510656296A CN 105177608 B CN105177608 B CN 105177608B
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Abstract
A kind of waste and old aluminum easy open can efficient green stripping method of the present invention, belongs to pop can depainting technical field；Technical problem to be solved is to provide a kind of method of waste and old aluminum easy open can efficient green depainting；The technical scheme used for：A kind of waste and old aluminum easy open can efficient green stripping method, comprises the following steps：Waste and old aluminum easy open can is crushed；The Fouling Cleaning of broken waste and old easy open can fractal surfaces is clean；Waste and old aluminum easy open can fragment after cleaning is dried；The waste and old aluminum easy open can fragment of drying is immersed into alkali pond and carries out alkali cleaning, alkali pond temperature is 350 DEG C 400 DEG C, and Immersion time is 14 seconds, then lifts the alkali lye for washing away fractal surfaces adhesion rapidly；The pop can fragment of depainting is obtained after drying；The method depainting process depainting time of the present invention only needs 1 4s, and depainting rate almost 100%, paint removal efficiency is high, and operating temperature is low, less energy consumption；Alkali lye in alkali pond can Reusability, do not produce secondary pollution.
Description
Technical field
A kind of waste and old aluminum easy open can efficient green stripping method of the present invention, belongs to pop can depainting technical field.
Background technology
The refusion regeneration technology of waste and old aluminum easy open can alloy material, according to processing mode, two major classes can be divided into, one kind is multiple
Change technology, pretreatment will be passed through（The process such as sorting, broken, packing）Pop can material be directly loadable into various forms of complexification stoves
The interior technology for carrying out melting；Another kind of is that the technology of paint removal processing is first carried out before pop can material enters melting furnace, i.e., paint removal-
Smelting technology.Latter class technology is the one preferred technique of current waste aluminum recovery recovery plant in the world, and is widely used.This
The key of kind technology is to employ Paint removing process, so as to form dedicated for the refusion regeneration of waste and old aluminum easy open can alloy material
Production line.
The existing aluminium scrap pop can recycling class in China is relatively low.High quality is made in waste and old aluminum easy open can again
Aluminum or aluminum alloy material, it is necessary to carry out strict pretreatment.It is mainly pair in addition to the dirt on surface is removed with detergent etc.
The processing of tank surface enamelled coating.Paint removal is the core technology that waste and old easy open can recycles, and it makes making profits again for waste and old easy open can
With having the advantages that productivity ratio is high, energy consumption is low, scaling loss is small, manufactured goods alloying component is easily controlled, therefore obtain extensive weight
Depending on.At present, substantially there is following several depainting technology during aluminium scrap pop can recycles：（1）Sandblasting depainting：Polished with sand paper
Remove enamelled coating.But time-consuming, single tank body can only be handled, can not also ensure 100% depainting rate, and particle can not be handled,
Be not suitable for extensive processing.（2）Pickling depainting：The characteristic depainting being passivated using the concentrated sulfuric acid, concentrated nitric acid.Sulfuric acid, nitric acid are due to tool
There is highly acid, oxidisability cause is blunt, can be reacted with the organic matter in enamelled coating, but has passivation to aluminium, corrosion-free.But base
Originally the attached crop in tank can not be removed, and the price of sulfuric acid, nitric acid is higher, severe operational environment perishable to equipment, it is actual to answer
It is very restricted in.（3）Organic solvent depainting：According to the similar principle that mixes between organic matter, dissolved using organic liquor
Organic varnish.This is also to apply wide method at present, but depainting rate is influenceed that substantially, 100% can not be ensured by concentration of organic solution
Depainting aluminium, and be connected during the recycling of whole aluminium scrap pop can with upper and lower process hardly possible, it is hardly formed with a set pattern
The mechanical automation tinuous production of mould.
On October 30th, 2008, Li Quanxiang, Cheng Bowen et al. have applied for a kind of Chinese invention patent " waste and old easy open can surface
Inorganic agent " (application number 200810152559.0), discloses that one kind can remove pop can surface baking vanish coating simultaneously and inwall is prevented
Rotten film surface inorganic agent, it is made up of dichloromethane, trifluoroacetic acid and water.On July 8th, 2009, Kang Weimin, Chen Banglie etc.
People has applied for Chinese invention patent " a kind of surface paint removal and stripping treatment agent for waste pop can " (application number 200910069633.7),
Pop can surface paint removal and stripping treatment agent can be removed simultaneously by disclosing one kind, and it is made up of formic acid, dichloromethane and water.
On 02 25th, 2011, the patent of invention pop can depainting process device of Liu Jihua, Liu Wei application（Application number：
201110045224.0）Disclose a kind of rotation rotary kiln technology.On November 02nd, 2012, Zhang Shengen, Liu Bo et al. application
" a kind of method that aluminium scrap pop can green circulatory safeguarding grades recycles（Application number：201210432365.2）”.Disclose a kind of low
The hot depainting technology of partial pressure of oxygen.The technology uses high-temperature hot air, and the depainting time is 20min ~ 80min, and technology energy machinery is certainly
Dynamicization is worked continuously, simple in construction, cost is low, and has waste gas recovery treatment technology, meets waste gas emission standard.
On 07 30th, 2013, Qiu Keqiang, Li Ning et al. applied for a kind of " stripping method of waste metal packing container
（Application number：CN201310324964.7）”.After the invention carries out vacuum cracking to waste metal packing container, removing vacuum is split
The material remained after solution；It is scrubbed, dry, obtain the waste metal of depainting；The waste metal packing container surface is coated with
Vinyl resins coating and/or epoxy resin coating and/or propylene coating；During vacuum cracking, the temperature of vacuum cracking is controlled
Spend for 550 ~ 650 DEG C, depainting time at least 10min, and by controlling condenser temperature, collect the pyrolysis product of condensation.
The content of the invention
Overcome the deficiencies in the prior art of the present invention, it is efficient that technical problem to be solved is to provide a kind of waste and old aluminum easy open can
The method of green depainting.
In order to solve the above technical problems, the technical solution adopted in the present invention is：A kind of waste and old aluminum easy open can efficient green
Stripping method, comprise the following steps：
Step 1, waste and old aluminum easy open can crushed；
It is step 2, the Fouling Cleaning of broken waste and old easy open can fractal surfaces is clean；
Step 3, by after cleaning waste and old aluminum easy open can fragment dry；
Step 4, the waste and old aluminum easy open can fragment of drying being immersed to the progress alkali cleaning of alkali pond, alkali pond temperature is 350 DEG C -400 DEG C,
Immersion time is the 1-4 seconds, then lifts the alkali lye for washing away fractal surfaces adhesion rapidly；Dry or the easy-to-draw of depainting is obtained after drying
Tank fragment.According to drying, condition can be identical with the drying condition after cleaning.
Chip size after pop can is broken does not interfere with the effect of caustic scrubbing step.Therefore can be according to cleaning dirt method
Or the needs of equipment reasonably select degree of crushing.The general fragment for being broken into size≤5 × 5cm can be applied to current big portion
Divide conventional cleaning way.
Currently preferred cleaning method, will be useless using strong cavitation caused by ultrasonic wave and vibration to be cleaned by ultrasonic
The dirt on old aluminum easy open can particle surface, which is peeled off, to come off, it is not necessary to which additional cleaning agent, dirt elution efficiency is high, green non-pollution.
And it is time-consuming also shorter, depending on fragment clean-up performance, being cleaned by ultrasonic 15-30min can be clean by Fouling Cleaning.
Likewise, baking step does not have particular/special requirement to drying condition yet, the purpose of drying is to prevent from bringing water into alkali pond,
Alkali is diluted, reduces elution effect and increase alkali cleaning time.
Consider energy resource consumption and cleaning efficiency, drying condition can preferred 105 DEG C -120 DEG C of drying temperature, during drying
Between 10min-30min.
It is sodium hydroxide, calcium hydroxide or the potassium hydroxide of molten state in alkali pond of the present invention, alkali pond temperature only has 350
It is DEG C -400 DEG C, low compared to smelting process or vacuum cracking method depainting, operating temperature；Compared to organic paint stripper depainting, the time is short,
Efficiency high, pollution are small.
The alkali lye for washing away fractal surfaces adhesion can also be used after alkali cleaning.Can enter containing alkali waste water after cleaning
Row recovery alkali and water, recycling.The technique of alkali collection is also simply more than the recovery of organic solvent.
Compared with prior art the invention has the advantages that：The present invention is easy-to-draw using the alkali lye progress aluminium of molten state
Tank depainting, depainting process depainting time only need 1-4s, and depainting rate almost 100%, paint removal efficiency is high, and operating temperature is low, energy consumption
It is few；Alkali lye in alkali pond can Reusability, do not produce secondary pollution.The technique can reclaim the aluminium in waste and old easy open can completely, should
Method can either reclaim reproducible utilization resource, and and can thoroughly solves the problem of environmental pollution that pop can depainting is brought, therefore has
There are boundless economic implications and social effect.
Embodiment
Below in conjunction with preferred embodiment, the invention will be further described.
Embodiment 1
A kind of waste and old aluminum easy open can efficient green stripping method, comprises the following steps：
Step 1, waste and old aluminum easy open can is taken, be cut into size≤5 × 5cm fragment；
Step 2, waste and old easy open can fragment is put into ultrasonic cleaner, is cleaned by ultrasonic 15min；
Step 3, by after cleaning waste and old aluminum easy open can fragment be sent into baking oven dried；
Step 4, the waste and old aluminum easy open can fragment feeding alkali pond by drying, alkali pond temperature maintain 350 DEG C -400 DEG C, will be useless
Old aluminum easy open can fragment is immersed in alkali pond, and Immersion time 1s, waste and old aluminum easy open can paint layer from surface can remove, then rapidly
Lift and be transferred to the alkali lye that rinse bath washes away fractal surfaces adhesion.Examine paint removal efficiency >=99%.
Embodiment 2
A kind of waste and old aluminum easy open can efficient green stripping method, comprises the following steps：
Step 1, waste and old aluminum easy open can is taken, be cut into size≤5 × 5cm fragment；
Step 2, waste and old easy open can fragment is put into ultrasonic cleaner, is cleaned by ultrasonic 19min；
Step 3, by after cleaning waste and old aluminum easy open can fragment be sent into baking oven dried, 110 DEG C ~ 115 DEG C of drying temperature,
Drying time 20min；
Step 4, the waste and old aluminum easy open can fragment feeding alkali pond by drying, alkali pond temperature maintain 350 DEG C -400 DEG C, will be useless
Old aluminum easy open can fragment is immersed in alkali pond, and Immersion time 3s, waste and old aluminum easy open can paint layer from surface can remove, then rapidly
Lift and be transferred to the alkali lye that rinse bath washes away fractal surfaces adhesion.Examine paint removal efficiency >=99%.
Embodiment 3
A kind of waste and old aluminum easy open can efficient green stripping method, comprises the following steps：
Step 1, waste and old aluminum easy open can is taken, be cut into size≤5 × 5cm fragment；
Step 2, waste and old easy open can fragment is put into ultrasonic cleaner, is cleaned by ultrasonic 30min；
Step 3, by after cleaning waste and old aluminum easy open can fragment be sent into baking oven dried, 115 DEG C ~ 120 DEG C of drying temperature,
Drying time 30min；
Step 4, the waste and old aluminum easy open can fragment feeding alkali pond by drying, alkali pond temperature maintain 350 DEG C -400 DEG C, will be useless
Old aluminum easy open can fragment is immersed in alkali pond, and Immersion time 4s, waste and old aluminum easy open can paint layer from surface can remove, then rapidly
Lift and be transferred to the alkali lye that ultrasonic cleaner washes away fractal surfaces adhesion.Examine paint removal efficiency >=99%.
Embodiment 4
A kind of waste and old aluminum easy open can efficient green stripping method, comprises the following steps：
Step 1, waste and old aluminum easy open can is taken, be cut into size≤5 × 5cm fragment；
Step 2, waste and old easy open can fragment is put into ultrasonic cleaner, is cleaned by ultrasonic 22min；
Step 3, by after cleaning waste and old aluminum easy open can fragment be sent into baking oven dried, 105 DEG C ~ 110 DEG C of drying temperature,
Drying time 10min；
Step 4, the waste and old aluminum easy open can fragment feeding alkali pond by drying, alkali pond temperature maintain 350 DEG C -400 DEG C, will be useless
Old aluminum easy open can fragment is immersed in alkali pond, and Immersion time 2s, waste and old aluminum easy open can paint layer from surface can remove, then rapidly
Lift and be transferred to the alkali lye that ultrasonic cleaner washes away fractal surfaces adhesion.Examine paint removal efficiency >=99%.
The present invention can be summarized with others without prejudice to the concrete form of the spirit or essential characteristics of the present invention.Therefore, nothing
By from the point of view of which point, the embodiment above of the invention can only all be considered the description of the invention and can not limit invention,
Claims indicate the scope of the present invention, and above-mentioned explanation does not point out the scope of the present invention, therefore, with the present invention
The suitable implication and scope of claims in any change, be all considered as being included within the scope of the claims.
Claims (6)
1. a kind of waste and old aluminum easy open can efficient green stripping method, it is characterised in that comprise the following steps：
Step 1, waste and old aluminum easy open can crushed；
It is step 2, the Fouling Cleaning of broken waste and old easy open can fractal surfaces is clean；
Step 3, by after cleaning waste and old aluminum easy open can fragment dry；
Step 4, the waste and old aluminum easy open can fragment of drying is immersed to the progress alkali cleaning of alkali pond, alkali pond temperature is 350 DEG C -400 DEG C, submergence
Time is the 1-4 seconds, then lifts the alkali lye for washing away fractal surfaces adhesion rapidly；The pop can dried or depainting is obtained after drying is broken
Piece；It is sodium hydroxide, calcium hydroxide or the potassium hydroxide of molten state in the alkali pond.
A kind of 2. waste and old aluminum easy open can efficient green stripping method according to claim 1, it is characterised in that：The step
1 waste and old aluminum easy open can is broken into size≤5 × 5cm fragment.
A kind of 3. waste and old aluminum easy open can efficient green stripping method according to claim 1, it is characterised in that：The step
2 using ultrasonic wave cleaning dirt.
A kind of 4. waste and old aluminum easy open can efficient green stripping method according to claim 3, it is characterised in that：It is cleaned by ultrasonic
Time be 15-30min.
A kind of 5. waste and old aluminum easy open can efficient green stripping method according to claim 1, it is characterised in that：Drying condition
For 105 DEG C -120 DEG C of drying temperature, drying time 10min-30min.
A kind of 6. waste and old aluminum easy open can efficient green stripping method according to claim 1, it is characterised in that：Adopted after alkali cleaning
The alkali lye adhered to fractal surfaces are washed away.
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| CN201510656296.7A CN105177608B (en) | 2015-10-12 | 2015-10-12 | A kind of waste and old aluminum easy open can efficient green stripping method |
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| CN201510656296.7A CN105177608B (en) | 2015-10-12 | 2015-10-12 | A kind of waste and old aluminum easy open can efficient green stripping method |
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| CN105177608B true CN105177608B (en) | 2017-11-28 |
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| CN106002295B (en) * | 2016-06-25 | 2018-03-02 | 大冶市正明铝业有限责任公司 | A kind of reactant uniformly mixes aluminum waste material depainting machining production line |
| CN110057194B (en) * | 2019-05-08 | 2020-07-10 | 衢州超越环保科技有限公司 | Old and useless easy open can surface depainting treatment facility |
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| SU1227714A1 (en) * | 1984-05-24 | 1986-04-30 | Институт общей и неорганической химии АН УССР | Method of removing ceramics from aluminium alloys |
| CN103757649A (en) * | 2014-01-02 | 2014-04-30 | 常熟理工学院 | Method of removing films on surfaces of waste ring-pull cans |
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