CN105177608A - Efficient and green depainting method for waste aluminum ring-pull can - Google Patents
Efficient and green depainting method for waste aluminum ring-pull can Download PDFInfo
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- CN105177608A CN105177608A CN201510656296.7A CN201510656296A CN105177608A CN 105177608 A CN105177608 A CN 105177608A CN 201510656296 A CN201510656296 A CN 201510656296A CN 105177608 A CN105177608 A CN 105177608A
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- waste aluminum
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- depainting
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Abstract
The invention discloses an efficient and green depainting method for a waste aluminum ring-pull can and belongs to the technical field of depainting of ring-pull cans. According to the adopted technical scheme, the efficient and green depainting method for the waste aluminum ring-pull can comprises the following steps that the waste aluminum ring-pull can is broken; dirt on the surfaces of fragments of the waste aluminum ring-pull can are completely cleaned out; the cleaned fragments of the waste aluminum ring-pull can are dried; the dried fragments of the waste aluminum ring-pull can are soaked in an alkali pond at the temperature of 350-400 DEG C for 1-4 seconds to be subjected to alkali washing, then the fragments of the waste aluminum ring-pull can are lifted up rapidly, and alkali liquor adhering to the surfaces of the fragments of the waste aluminum ring-pull can are washed out; and the depainted fragments of the waste aluminum ring-pull can are obtained after being aired. According to the efficient and green depainting method for the waste aluminum ring-pull can, time for depainting of the depainting process is just 1-4 seconds, the depainting rate approximates to 100%, the depainting efficiency is high, the working temperature is low, and energy consumption is low; the alkali liquor in the alkali pond can be used repeatedly, and secondary pollution is avoided.
Description
Technical field
A kind of waste aluminum pop can of the present invention efficient green stripping method, belongs to pop can depainting technical field.
Background technology
The refusion regeneration technology of waste aluminum pop can alloy material, according to processing mode, can be divided into two large classes, a class is complexification technology, and the pop can material be about to through pre-treatment operations such as () sorting, fragmentation, packings directly loads the technology of carrying out melting in various forms of complexification stove; Another kind of is the technology of first carrying out paint removal process before pop can material enters smelting furnace, i.e. paint removal-smelting technology.A rear class technology is the one preferred technique of waste aluminum recovery recovery plant in the world at present, and is used widely.The key of this technology is to have employed Paint removing process, thus defines the refusion regeneration production line being specifically designed to waste aluminum pop can alloy material.
China's existing aluminium scrap pop can recycling class is lower.Waste aluminum pop can be made high-quality aluminum or aluminum alloy material again, must strict pre-treatment be carried out.Except removing except the dirt on surface, mainly to the process of tank surface enamelled coating with washing composition etc.Paint removal is the core technology that waste and old easy open can is recycled, and its regeneration of waste and old easy open can is had advantage such as productivity is high, energy consumption is low, scaling loss is little, finished product alloying constituent easily controls, therefore obtains and pay attention to widely.At present, in aluminium scrap pop can recycling process, depainting technology roughly has following several: (1) sandblasting depainting: remove enamelled coating with sand papering.But length consuming time, can only process single tank body, also cannot ensure 100% depainting rate, and cannot process particle, be not suitable for extensive process.(2) pickling depainting: the characteristic depainting utilizing the vitriol oil, concentrated nitric acid passivation.Sulfuric acid, nitric acid are owing to having strongly-acid, and oxidisability causes blunt, can react, but have passivation to aluminium with the organism in enamelled coating, corrosion-free.But the attached crop that substantially can not remove in tank, and the price of sulfuric acid, nitric acid is higher, perishable to equipment, severe operational environment, is very restricted in practical application.(3) organic solvent depainting: according to the similar principle that mixes between organism, adopts organic liquor to dissolve organic varnish.This is also apply method more widely at present, but depainting rate affects obviously by concentration of organic solution, 100% depainting aluminium cannot be ensured, and be connected with upper and lower operation difficulty in whole aluminium scrap pop can recycling process, be difficult to form mechanical automation tinuous production of certain scale.
On October 30th, 2008, the people such as Li Quanxiang, Cheng Bowen have applied for Chinese invention patent " a kind of surface treatment agent of waste and old easy open can surface " (application number 200810152559.0), disclose one and can remove pop can surface baking vanish coating and inner wall anti-corrosive film surface treatment agent simultaneously, it is made up of methylene dichloride, trifluoroacetic acid and water.On July 8th, 2009, the people such as Kang Weimin, Chen Banglie have applied for Chinese invention patent " a kind of surface paint removal and stripping treatment agent for waste pop can " (application number 200910069633.7), disclose one can remove pop can surface paint removal and stripping treatment agent simultaneously, it is made up of formic acid, methylene dichloride and water.
On 02 25th, 2011, the patent of invention pop can depainting process device (application number: 201110045224.0) disclose one and rotate back to rotary kiln technology of Liu Jihua, Liu Wei application.On November 02nd, 2012, the people such as Zhang Shengen, Liu Bo apply for a kind of method of aluminium scrap pop can green circulatory safeguarding grades recycling " (application number: 201210432365.2) ".Disclose the hot depainting technology of a kind of low oxygen partial pressure.This technology adopts high-temperature hot air, and the depainting time is 20min ~ 80min, and this technology energy mechanical automation is worked continuously, and structure is simple, cost is low, and has waste gas recovery treatment technology, meets waste gas emission standard.
On 07 30th, 2013, the people such as Qiu Keqiang, Li Ning applied for " a kind of stripping method (application number: CN201310324964.7) of waste metal packaging vessel ".After this invention carries out vacuum cracking to waste metal packaging vessel, material residual after removing vacuum cracking; Through washing, drying, obtain the waste metal of depainting; Described waste metal packaging vessel surface-coated has vinyl resins coating and/or epoxy resin coating and/or propylene system coating; During vacuum cracking, the temperature controlling vacuum cracking is 550 ~ 650 DEG C, depainting time at least 10min, and by controlling condenser temperature, collects the split product of condensation.
Summary of the invention
The present invention overcomes the deficiencies in the prior art, and technical problem to be solved is to provide a kind of method of waste aluminum pop can efficient green depainting.
For solving the problems of the technologies described above, the technical solution adopted in the present invention is: a kind of waste aluminum pop can efficient green stripping method, comprises the steps:
Step 1, waste aluminum pop can is broken;
Step 2, by clean for the Fouling Cleaning of the waste and old easy open can fractal surfaces of fragmentation;
Step 3, by cleaning after waste aluminum pop can fragment dry;
Step 4, by the waste aluminum pop can fragment of oven dry immerse alkali pond carry out alkali cleaning, alkali pond temperature is 350 DEG C-400 DEG C, and Immersion time is 1-4 second, then mention rapidly wash away fractal surfaces adhere to alkali lye; Dry or obtain after drying the pop can fragment of depainting.According to oven dry, condition can be identical with the drying condition after cleaning.
Chip size after pop can fragmentation can not affect the effect of caustic scrubbing step.Therefore reasonably degree of crushing can be selected according to the needs of cleaning dirt method or equipment.The fragment being generally broken into size≤5 × 5cm can be applicable to the cleaning way that major part is conventional at present.
The preferred purging method of the present invention is ultrasonic cleaning, and the dirt on waste aluminum pop can particle surface is peeled off and come off by the strong cavatition utilizing ultrasonic wave to produce and vibration, and do not need additional clean-out system, dirt elution efficiency is high, green non-pollution.And consuming time also shorter, depending on fragment clean-up performance, ultrasonic cleaning 15-30min can be clean by Fouling Cleaning.
Same, baking step does not have particular requirement to drying condition yet, and the object of oven dry prevents water-band to enter alkali pond, dilutes alkali, reduces elute effect and increases the alkali cleaning time.
Consider energy consumption and cleaning efficiency, drying condition can preferred bake out temperature 105 DEG C-120 DEG C, drying time 10min-30min.
Be the sodium hydroxide of molten state, calcium hydroxide or potassium hydroxide in alkali pond of the present invention, alkali pond temperature only has 350 DEG C-400 DEG C, and compared to smelting process or vacuum cracking method depainting, working temperature is low; Compared to organic paint remover depainting, the time is short, and efficiency is high, pollutes little.
Also ultrasonic cleaning can be adopted after alkali cleaning to wash away the alkali lye of fractal surfaces adhesion.Can recoverys alkali and water be carried out containing alkali waste water after cleaning, reuse.The technique of alkali collection is also simply many than the recovery of organic solvent.
Compared with prior art the present invention has following beneficial effect: the present invention adopts the alkali lye of molten state to carry out aluminum easy open can depainting, and the depainting process depainting time only needs 1-4s, and depainting rate is close to 100%, and paint removal efficiency is high, and working temperature is low, less energy consumption; Alkali lye in alkali pond can Reusability, does not produce secondary pollution.This technique can reclaim the aluminium in waste and old easy open can completely, and the method can either reclaim reproducible utilization resource, thoroughly can solve again the problem of environmental pollution that pop can depainting brings, therefore have 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 aluminum pop can efficient green stripping method, comprises the steps:
Step 1, get waste aluminum pop can, be cut into the fragment of size≤5 × 5cm;
Step 2, waste and old easy open can fragment is put into ultrasonic cleaner, ultrasonic cleaning 15min;
Step 3, by cleaning after waste aluminum pop can fragment send into baking oven dry;
Step 4, the waste aluminum pop can fragment feeding alkali pond of will dry, alkali pond temperature maintains 350 DEG C-400 DEG C, waste aluminum pop can fragment is immersed in alkali pond, Immersion time is 1s, waste aluminum pop can paint layer from surface can remove, and then mentions rapidly and is transferred to the alkali lye that rinse bath washes away fractal surfaces adhesion.Inspection paint decreasing ratio >=99%.
Embodiment 2
A kind of waste aluminum pop can efficient green stripping method, comprises the steps:
Step 1, get waste aluminum pop can, be cut into the fragment of size≤5 × 5cm;
Step 2, waste and old easy open can fragment is put into ultrasonic cleaner, ultrasonic cleaning 19min;
Step 3, by cleaning after waste aluminum pop can fragment send into baking oven dry, bake out temperature 110 DEG C ~ 115 DEG C, drying time 20min;
Step 4, the waste aluminum pop can fragment feeding alkali pond of will dry, alkali pond temperature maintains 350 DEG C-400 DEG C, waste aluminum pop can fragment is immersed in alkali pond, Immersion time is 3s, waste aluminum pop can paint layer from surface can remove, and then mentions rapidly and is transferred to the alkali lye that rinse bath washes away fractal surfaces adhesion.Inspection paint decreasing ratio >=99%.
Embodiment 3
A kind of waste aluminum pop can efficient green stripping method, comprises the steps:
Step 1, get waste aluminum pop can, be cut into the fragment of size≤5 × 5cm;
Step 2, waste and old easy open can fragment is put into ultrasonic cleaner, ultrasonic cleaning 30min;
Step 3, by cleaning after waste aluminum pop can fragment send into baking oven dry, bake out temperature 115 DEG C ~ 120 DEG C, drying time 30min;
Step 4, the waste aluminum pop can fragment feeding alkali pond of will dry, alkali pond temperature maintains 350 DEG C-400 DEG C, waste aluminum pop can fragment is immersed in alkali pond, Immersion time is 4s, waste aluminum pop can paint layer from surface can remove, and then mentions rapidly and is transferred to the alkali lye that ultrasonic cleaner washes away fractal surfaces adhesion.Inspection paint decreasing ratio >=99%.
Embodiment 4
A kind of waste aluminum pop can efficient green stripping method, comprises the steps:
Step 1, get waste aluminum pop can, be cut into the fragment of size≤5 × 5cm;
Step 2, waste and old easy open can fragment is put into ultrasonic cleaner, ultrasonic cleaning 22min;
Step 3, by cleaning after waste aluminum pop can fragment send into baking oven dry, bake out temperature 105 DEG C ~ 110 DEG C, drying time 10min;
Step 4, the waste aluminum pop can fragment feeding alkali pond of will dry, alkali pond temperature maintains 350 DEG C-400 DEG C, waste aluminum pop can fragment is immersed in alkali pond, Immersion time is 2s, waste aluminum pop can paint layer from surface can remove, and then mentions rapidly and is transferred to the alkali lye that ultrasonic cleaner washes away fractal surfaces adhesion.Inspection paint decreasing ratio >=99%.
The present invention can summarize with other the specific form without prejudice to spirit of the present invention or principal character.Therefore, no matter from which point, above-mentioned embodiment of the present invention all can only be thought explanation of the present invention and can not limit invention, claims indicate scope of the present invention, and scope of the present invention is not pointed out in above-mentioned explanation, therefore, any change in the implication suitable with claims of the present invention and scope, all should think to be included in the scope of claims.
Claims (7)
1. a waste aluminum pop can efficient green stripping method, is characterized in that comprising the steps:
Step 1, waste aluminum pop can is broken;
Step 2, by clean for the Fouling Cleaning of the waste and old easy open can fractal surfaces of fragmentation;
Step 3, by cleaning after waste aluminum pop can fragment dry;
Step 4, by the waste aluminum pop can fragment of oven dry immerse alkali pond carry out alkali cleaning, alkali pond temperature is 350 DEG C-400 DEG C, and Immersion time is 1-4 second, then mention rapidly wash away fractal surfaces adhere to alkali lye; Dry or obtain after drying the pop can fragment of depainting.
2. a kind of waste aluminum pop can efficient green stripping method according to claim 1, is characterized in that: described step 1 waste aluminum pop can is broken into the fragment of size≤5 × 5cm.
3. a kind of waste aluminum pop can efficient green stripping method according to claim 1, is characterized in that: described step 2 adopts ultrasonic cleaning dirt.
4. a kind of waste aluminum pop can efficient green stripping method according to claim 3, is characterized in that: the time of ultrasonic cleaning is 15-30min.
5. a kind of waste aluminum pop can efficient green stripping method according to claim 1, is characterized in that: drying condition is bake out temperature 105 DEG C-120 DEG C, drying time 10min-30min.
6. a kind of waste aluminum pop can efficient green stripping method according to claim 1, is characterized in that: be the sodium hydroxide of molten state, calcium hydroxide or potassium hydroxide in described alkali pond.
7. a kind of waste aluminum pop can efficient green stripping method according to claim 1, is characterized in that: adopt ultrasonic cleaning to wash away the alkali lye of fractal surfaces adhesion after alkali cleaning.
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| Application Number | Priority Date | Filing Date | Title |
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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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| Application Number | Priority Date | Filing Date | Title |
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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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| CN105177608A true CN105177608A (en) | 2015-12-23 |
| CN105177608B CN105177608B (en) | 2017-11-28 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106002295A (en) * | 2016-06-25 | 2016-10-12 | 诸葛杨杨 | Aluminum waste depainting machining production line capable of achieving uniform mixing of reactants |
| CN110057194A (en) * | 2019-05-08 | 2019-07-26 | 衢州超越环保科技有限公司 | A kind of waste and old easy open can surface depainting process device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
-
2015
- 2015-10-12 CN CN201510656296.7A patent/CN105177608B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106002295A (en) * | 2016-06-25 | 2016-10-12 | 诸葛杨杨 | Aluminum waste depainting machining production line capable of achieving uniform mixing of reactants |
| CN110057194A (en) * | 2019-05-08 | 2019-07-26 | 衢州超越环保科技有限公司 | A kind of waste and old easy open can surface depainting process device |
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| Publication number | Publication date |
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| CN105177608B (en) | 2017-11-28 |
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