WO2011032696A1 - Method for recycling aluminium from drink cans - Google Patents
Method for recycling aluminium from drink cans Download PDFInfo
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- WO2011032696A1 WO2011032696A1 PCT/EP2010/005681 EP2010005681W WO2011032696A1 WO 2011032696 A1 WO2011032696 A1 WO 2011032696A1 EP 2010005681 W EP2010005681 W EP 2010005681W WO 2011032696 A1 WO2011032696 A1 WO 2011032696A1
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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
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/005—Preliminary treatment of scrap
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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
- C22B21/00—Obtaining aluminium
- C22B21/0007—Preliminary treatment of ores or scrap or any other metal source
-
- 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
- C22B21/00—Obtaining aluminium
- C22B21/0038—Obtaining aluminium by other processes
- C22B21/0069—Obtaining aluminium by other processes from scrap, skimmings or any secondary source aluminium, e.g. recovery of alloy constituents
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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
- C22B7/001—Dry processes
- C22B7/003—Dry processes only remelting, e.g. of chips, borings, turnings; apparatus used therefor
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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
Definitions
- the invention relates to a method for recycling aluminum from beverage cans with the steps of crushing the cans into small particles, cleaning the particles and subsequent further processing.
- Beverages, such as beer, soft drinks, etc. are sold in aluminum cans to a considerable extent. These aluminum cans are recycled.
- bales are then placed in a known type of subsequent processing for recycling in a molten bath.
- This method has the disadvantage that the bales of compressed cans relatively cool the molten bath into which they are placed, so that the aluminum contained in them does not melt immediately. Rather, the bale heats up slowly and especially the aluminum lying further inside the bale still forms thick oxide layers before melting. To remove these oxides from the molten aluminum bath, an appropriate amount of aggregates must be added, which brings with it the disadvantage of a high slag production. In addition, the formation of aluminum oxides deteriorates the yield of recycled aluminum.
- can particles are then cleaned of adhering colors and finally pressed in the course of further processing into small pellets or nuggets.
- For cleaning it is proposed to give the crushed can particles with abrasive agents in a drum, so as to mechanically abrade adhering paint particles, etc. It is further proposed to subsequently expose such pre-treated can particles to a high temperature in order to incinerate adhering foreign particles.
- a disadvantage of the method described is, in particular, that the introduction of foreign matter between the can particles for their abrasive cleaning these then only provided for cleaning foreign matter then again consuming to be removed.
- the abradingly cleaned surfaces of the can bodies which are metallically bright, in turn tend to form oxide layers, in particular if they are then again exposed to a high temperature, which is basically beneficial for oxide formation.
- oxides have the disadvantages described above.
- Object of the present invention is therefore to further develop such a known recycling process to the effect that it is easier and thus cheaper and also more effective in particular feasible.
- This object is achieved in that a two-stage cleaning of the crushed Aluminiumdosenteilchen takes place with a first spin stage for centrifuging adhering moisture and with a downstream thermal Abbrenncut.
- a solvent is added to the particles prior to the spin stage in order to be able to more easily dissolve adhering organic elements.
- this solvent is water (H 2 0), which has a very good dissolution effect for the sugar and similar substances usually contained in soft drinks and beer etc.
- the solvent / water introduced into the aluminum particles can be spun off again well.
- the subsequent processing step of the thermal firing step comprises the direct introduction of the cleaned can particles into a molten bath.
- FIG. 1 is a schematic diagram of a system for carrying out the method according to the invention.
- FIG. 1 shows a feeding station 1, at which aluminum beverage cans to be recycled are entered into the plant.
- an overband magnet 4 is arranged above this vibrating channel 3, with which ferromagnetic impurities are collected from the aluminum scrap.
- the aluminum cans are distributed via distributing conveyor 5 to a plurality of shredders 6, in which the cans are shredded by cutting, chopping or the like into small aluminum particles.
- the can particles output by the shredders 6 are then transported via a scraping conveyor 7 to a metering device 8.
- the comminuted can particles, a solvent such as water are supplied. Remains of beer, soft drinks, etc. sticking to the can particles are dissolved with this solvent.
- the particles are then discharged from the metering device 8 into a centrifuge 9. In this centrifuge adhering liquid residues are thrown off. The solvent is thereby removed again. As a result, a first cleaning step for the can particles is realized. Due to the friction of the can bodies together also creates a certain frictional heat, which improves the cleaning of the can particles together with the friction.
- the thus pre-cleaned can particles are once again passed through neodymium magnetic drums 1 1, where the can bodies are once again freed from ferromagnetic elements. Subsequently, the thus cleaned particles are introduced into a storage bunker 12.
- This storage bunker 12 acts as a buffer for the subsequent kiln 13, in which color particles adhering to the aluminum doses are thermally dissolved and burnt.
- the Abbrennofen 13 is designed as a thermal cleaning drum and the resulting exhaust gases are cleaned in a filter 14 and possibly burned after. The resulting energy can also be used, for example, to heat the thermal cleaning drum of the Abbrennofens 13.
- the thus cleaned can particles are finally introduced into a melting furnace 15. This introduction takes place continuously and with constant stirring of the liquid melt bath. This constant stirring ensures that the individual can particles do not float on the melt but are stirred directly into the liquid melt bath and are completely surrounded by liquid melt there. As a result, a rapid melting of the aluminum particles is achieved, whereby the unwanted formation of oxide layers is prevented on the aluminum and results in a very high overall aluminum yield in the recycling process.
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- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
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Abstract
The invention relates to a method for recycling aluminium from drink cans, in which the drink cans are comminuted to small particles in a shredder (6) and the particles are first cleaned of adhering drink residues and subsequently cleaned of adhering paint residues. The first cleaning stage is a spinning stage in a centrifuge (9). The second downstream cleaning stage is a thermal burning-off stage in a furnace (13). Finally, the thermally cleaned particles are melted in a melt vessel (15).
Description
Verfahren zum Recvclen von Aluminium aus Getränkedosen Method for reclaiming aluminum from beverage cans
Beschreibung description
Die Erfindung betrifft ein Verfahren zum Recyclen von Aluminium aus Getränkedosen mit den Schritten des Zerkleinerns der Dosen zu kleinen Teilchen, einem Reinigen der Teilchen und einer anschließenden Weiterverarbeitung. The invention relates to a method for recycling aluminum from beverage cans with the steps of crushing the cans into small particles, cleaning the particles and subsequent further processing.
Getränke, wie Bier, Softdrinks etc. werden in erheblichen Umfang in Aluminiumdosen verkauft. Diese Aluminiumdosen werden recyclet. Beverages, such as beer, soft drinks, etc. are sold in aluminum cans to a considerable extent. These aluminum cans are recycled.
Hierzu ist es einerseits bekannt, sie zu sammeln und dann zu Ballen zu pres- sen. Diese Ballen werden dann bei einer bekannten Art der anschließenden Weiterverarbeitung zum Recyclen in ein Schmelzbad gegeben. On the one hand, it is known to collect them and then to press them into bales. These bales are then placed in a known type of subsequent processing for recycling in a molten bath.
Dieses Verfahren hat den Nachteil, dass die Ballen aus zusammengepressten Dosen das Schmelzbad, in das sie gegeben werden, relativ stark abkühlen, so dass das in ihnen enthaltene Aluminium nicht unmittelbar aufschmilzt. Vielmehr erhitzt sich der Ballen erst langsam und insbesondere das weiter im Inneren des Ballens liegende Aluminium bildet vor einem Schmelzen noch dicke Oxydschichten. Um diese Oxyde aus dem Aluminiumschmelzbad zu entfernen, muss eine entsprechende Menge an Zuschlagstoffen beigegeben werden, was den Nachteil einer hohen Schlackenproduktion mit sich bringt. Außerdem wird durch die Bildung von Aluminiumoxiden die Ausbeute an recycletem Aluminium verschlechtert. This method has the disadvantage that the bales of compressed cans relatively cool the molten bath into which they are placed, so that the aluminum contained in them does not melt immediately. Rather, the bale heats up slowly and especially the aluminum lying further inside the bale still forms thick oxide layers before melting. To remove these oxides from the molten aluminum bath, an appropriate amount of aggregates must be added, which brings with it the disadvantage of a high slag production. In addition, the formation of aluminum oxides deteriorates the yield of recycled aluminum.
Um dieses Problem zu vermeiden wird beispielsweise in der WO 96/01332 be- schrieben, die gepressten Ballen zu schneiden und die in ihnen enthaltenen Getränkedosen somit zu Teilchen zu zerkleinern. In order to avoid this problem, it is described, for example, in WO 96/01332, to cut the pressed bales and thus to comminute the beverage cans contained in them into particles.
Diese Dosenteilchen werden dann von anhaftenden Farben gereinigt und abschließend im Zuge der Weiterverarbeitung zu kleinen Pellets oder Nuggets gepresst.
Für die Reinigung wird dabei vorgeschlagen, die zerkleinerten Dosenteilchen mit abrasiven Mitteln in eine Trommel zu geben, um so anhaftende Farbpartikel etc. mechanisch abzuschleifen. Es wird weiter vorgeschlagen, derart vorbe- handelte Dosenteilchen anschließend einer hohen Temperatur auszusetzen, um noch anhaftende Fremdpartikel zu verbrennen. These can particles are then cleaned of adhering colors and finally pressed in the course of further processing into small pellets or nuggets. For cleaning it is proposed to give the crushed can particles with abrasive agents in a drum, so as to mechanically abrade adhering paint particles, etc. It is further proposed to subsequently expose such pre-treated can particles to a high temperature in order to incinerate adhering foreign particles.
Abschließend werden die derart erhaltenden gereinigten Dosenteilchen zu Pellets oder Nuggets gepresst. Finally, the thus obtained purified can particles are pressed into pellets or nuggets.
Nachteilig an dem beschriebenen Verfahren ist insbesondere, dass durch das Einbringen von Fremdstoffen zwischen die Dosenteilchen zu deren abrasiven Reinigung diese nur für die Reinigung vorgesehenen Fremdstoffe anschließend wieder aufwändig entfernt werden müssen. Außerdem neigen die abrasiv ge- reinigten Oberflächen der Dosenteilchen, die metallisch blank sind, wiederum zur Bildung von Oxidschichten, insbesondere wenn sie anschließend wieder einer hohen Temperatur ausgesetzt werden, die einer Oxidbildung grundsätzlich zuträglich ist. Diese Oxide haben die oben beschriebenen Nachteile. Aufgabe der vorliegenden Erfindung ist es demgemäß, ein derart bekanntes Recyclingverfahren dahingehend weiterzuentwickeln, dass es einfacher und somit kostengünstiger und auch insbesondere effektiver durchführbar ist. A disadvantage of the method described is, in particular, that the introduction of foreign matter between the can particles for their abrasive cleaning these then only provided for cleaning foreign matter then again consuming to be removed. In addition, the abradingly cleaned surfaces of the can bodies, which are metallically bright, in turn tend to form oxide layers, in particular if they are then again exposed to a high temperature, which is basically beneficial for oxide formation. These oxides have the disadvantages described above. Object of the present invention is therefore to further develop such a known recycling process to the effect that it is easier and thus cheaper and also more effective in particular feasible.
Diese Aufgabe wird erfindungsgemäß dadurch gelöst, dass ein zweistufiges Reinigen der zerkleinerten Aluminiumdosenteilchen erfolgt mit zunächst einer Schleuderstufe zum Abschleudern anhaftender Feuchtigkeit und mit einer nachgeschalteten thermischen Abbrennstufe. This object is achieved in that a two-stage cleaning of the crushed Aluminiumdosenteilchen takes place with a first spin stage for centrifuging adhering moisture and with a downstream thermal Abbrennstufe.
Durch die Schleuderstufe zum Abschleudern von anhaftender Flüssigkeit wird für die nachgeschaltete thermische Abbrennstufe verhindert, dass in ungewünschter Weise noch organische Stoffe an den Dosenteilchen haften und mit diesen in einen Abbrennofen eingebracht werden. Diese organischen Stoffe sind Reste von den Getränken, wie Bier oder Softdrinks, die in den Getränkedosen enthalten waren. Diese Stoffe können in der Hitze des Abbrennofens an den Dosenteilchen stark anhaftende Verbindungen verursachen.
Da erfindungsgemäß auf eine mechanisch abrasive Reinigung der Dosenteilchen verzichtet wird, werden auch keine metallisch blanken Oberflächen erzeugt, so dass keine starke Bildung von Oxiden auftritt. By the spin stage for spinning off adhering liquid is prevented for the downstream thermal Abbrennstufe that undesirably still organic substances adhere to the can particles and are introduced with these in a Abbrennofen. These organic substances are residues of the beverages, such as beer or soft drinks, contained in the beverage cans. These substances can cause strongly adhering compounds to the can particles in the heat of the baking oven. Since according to the invention a mechanically abrasive cleaning of the can particles is dispensed with, no metallically bright surfaces are produced, so that no strong formation of oxides occurs.
Bei einer besonders bevorzugten Ausführungsform der Erfindung wird den Teilchen vor der Schleuderstufe noch ein Lösungsmittel zugesetzt, um anhaftende organische Elemente leichter lösen zu können. Vorzugsweise handelt es sich bei diesem Lösungsmittel um Wasser (H20), das für den üblicherweise in Softdrinks und Bier etc. enthaltenen Zucker und ähnliche Stoffe eine sehr gute Lösungswirkung aufweist. In a particularly preferred embodiment of the invention, a solvent is added to the particles prior to the spin stage in order to be able to more easily dissolve adhering organic elements. Preferably, this solvent is water (H 2 0), which has a very good dissolution effect for the sugar and similar substances usually contained in soft drinks and beer etc.
Bei dem anschließenden Reinigen in der Schleuderstufe kann das in die Alu- miniumteilchen eingebrachte Lösungsmittel/Wasser wieder gut abgeschleudert werden. In the subsequent cleaning in the spin stage, the solvent / water introduced into the aluminum particles can be spun off again well.
Es besteht dabei die Möglichkeit, dass aufgrund dieses Lösungsmittels die aneinander vorbeibewegten Teilchen durch die dabei entstehende Friktion sich auch leicht erwärmen, so dass einerseits die Lösungs-/Reinigungswirkung erhöht wird. Andererseits gelangen die Dosenteilchen dann schon leicht vorgewärmt in die anschließende Abbrennstufe. Durch diese Vorerwärmung kann die Abbrennstufe energetisch günstiger durchgeführt werden. Des Weiteren wird vorgeschlagen, dass der sich an die thermische Abbrennstufe anschließende Verfahrensschritt der Weiterverarbeitung das unmittelbare Einbringen der gereinigten Dosenteilchen in ein Schmelzbad umfasst. There is the possibility that due to this solvent, the particles moved past each other by the resulting friction also heat slightly, so that on the one hand, the solvent / cleaning effect is increased. On the other hand, the can bodies then already get slightly preheated in the subsequent burning stage. By this preheating the burn-off can be performed energetically cheaper. Furthermore, it is proposed that the subsequent processing step of the thermal firing step comprises the direct introduction of the cleaned can particles into a molten bath.
Dies hat den Vorteil, dass die bereits in der Abbrennstufe erwärmten Teilchen mit einer relativ hohen Temperatur in das Schmelzbad gelangen. Dies ist unter energetischen Gesichtpunkten sehr günstig, da eine bereits erfolgte Vorerwärmung der Dosenteilchen auf eine relativ hohe Temperatur genutzt werden kann und die hierfür notwendige Energie nicht aus dem Schmelzbad entnommen werden muss. Hierdurch wird eine als nachteilig empfundene Abkühlung des Schmelzbades verhindert.
Es wird besonders bevorzugt, der thermischen Abbrennstufe einen Lagerbunker als Pufferspeicher vorzuschalten. Hierdurch ist es möglich, unabhängig von Durchsatzschwankungen im vorgeschalteten Anlagenteilen die Abbrennstufe kontinuierlich zu betreiben und insbesondere die aus dieser erfolgende Abgabe von Dosenteilchen in das nachgeschaltete Schmelzbad dosiert und kontinuierlich erfolgen zu lassen. This has the advantage that the particles already heated in the burn-off stage reach the molten bath at a relatively high temperature. This is very favorable from an energetic point of view, since an already preheating of the can particles to a relatively high temperature can be used and the energy required for this need not be removed from the molten bath. As a result, a perceived as disadvantageous cooling of the molten bath is prevented. It is particularly preferred to precede the thermal burn-off stage with a storage bunker as a buffer store. This makes it possible, regardless of throughput fluctuations in the upstream system parts to operate the Abbrennstufe continuously and in particular dosed from this taking place delivery of can particles in the downstream melt and continuously.
Es wird dabei insbesondere vorgeschlagen, das Einbringen der Dosenteilchen aus der Abbrennstufe in das flüssige Schmelzbad unter Rühren vorzunehmen. Durch dieses Einrühren werden die Teilchen nicht nur auf das Schmelzbad gegeben sondern tief in dieses eingebracht und dort von allen Seiten von flüssiger Schmelze umgeben. Dies führt zu einem schnellen Aufschmelzen der einzelnen Teilchen. Aufgrund eines derartigen schnellen Aufschmelzens wird die Bildung von Oxiden verhindert und insgesamt die Ausbeute an Recyclingaluminium erheblich erhöht. It is proposed in particular to carry out the introduction of the can particles from the Abbrennstufe in the molten bath with stirring. By this stirring, the particles are not only added to the molten bath but deeply introduced into this and surrounded there from all sides by liquid melt. This leads to a rapid melting of the individual particles. Due to such a rapid reflow, the formation of oxides is prevented and overall the yield of recycled aluminum is significantly increased.
Weitere Vorteile und Merkmale der Erfindung ergeben sich aus der nachfolgenden Beschreibung einer für das erfindungsgemäße Verfahren vorgesehe- nen Anlage. Dabei zeigt Further advantages and features of the invention will become apparent from the following description of a plant provided for the method according to the invention. It shows
Figur 1 eine Prinzipsskizze einer Anlage zur Durchführung des erfindungsgemäßen Verfahrens. In der Figur 1 erkennt man eine Aufgabestation 1 , an der zu recyclende Aluminiumgetränkedosen in die Anlage eingegeben werden. Figure 1 is a schematic diagram of a system for carrying out the method according to the invention. FIG. 1 shows a feeding station 1, at which aluminum beverage cans to be recycled are entered into the plant.
Über einen Scharnierbandförderer 2 werden die aufgegebenen Aluminiumdosen zu einer Vibrorinne 3 transportiert und von oben auf diese abgegeben. About a hinge belt conveyor 2, the abandoned aluminum cans are transported to a Vibrorinne 3 and discharged from above on this.
Über dieser Vibrorinne 3 ist dabei ein Überbandmagnet 4 angeordnet, mit dem ferromagnetische Verunreinigungen aus dem Aluminiumschrott abgesammelt werden.
Von der Vibrorinne 3 werden die Aluminiumdosen über Verteilförderer 5 auf mehrere Zerkleinerer 6 verteilt, in denen die Dosen durch Schneiden, Häckseln o. ä. zu kleinen Aluminiumteilchen geschreddert werden. Die von den Zerkleinerern 6 ausgegebenen Dosenteilchen werden dann über einen Kratzförderer 7 zu einer Dosiervorrichtung 8 transportiert. In this case, an overband magnet 4 is arranged above this vibrating channel 3, with which ferromagnetic impurities are collected from the aluminum scrap. From the vibrating chute 3, the aluminum cans are distributed via distributing conveyor 5 to a plurality of shredders 6, in which the cans are shredded by cutting, chopping or the like into small aluminum particles. The can particles output by the shredders 6 are then transported via a scraping conveyor 7 to a metering device 8.
In dieser Dosiervorrichtung kann den zerkleinerten Dosenteilchen ein Lösungsmittel wie beispielsweise Wasser zugeführt werden. Mit diesem Lö- sungsmittel werden an den Dosenteilchen anhaftende Reste von Bier, Soft- drinks etc. gelöst. In this metering device, the comminuted can particles, a solvent such as water are supplied. Remains of beer, soft drinks, etc. sticking to the can particles are dissolved with this solvent.
Die Teilchen werden dann von der Dosiervorrichtung 8 in eine Zentrifuge 9 abgegeben. In dieser Zentrifuge werden anhaftende Flüssigkeitsreste abge- schleudert. Auch das Lösungsmittel wird hierdurch wieder entfernt. Dadurch wird ein erster Reinigungsschritt für die Dosenteilchen realisiert. Aufgrund der Reibung der Dosenteilchen aneinander entsteht auch eine gewisse Reibungswärme, die zusammen mit der Reibung die Reinigung der Dosenteilchen verbessert. The particles are then discharged from the metering device 8 into a centrifuge 9. In this centrifuge adhering liquid residues are thrown off. The solvent is thereby removed again. As a result, a first cleaning step for the can particles is realized. Due to the friction of the can bodies together also creates a certain frictional heat, which improves the cleaning of the can particles together with the friction.
Über einen weiteren Kratzförderer 10 werden die derart vorgereinigten Dosenteilchen noch einmal über Neodymmagnettrommeln 1 1 geleitet, wo die Dosenteilchen noch einmal von ferromagnetischen Elementen befreit werden. Anschließend werden die derart gereinigten Teilchen in einen Lagerbunker 12 eingegeben. About another scraper conveyor 10, the thus pre-cleaned can particles are once again passed through neodymium magnetic drums 1 1, where the can bodies are once again freed from ferromagnetic elements. Subsequently, the thus cleaned particles are introduced into a storage bunker 12.
Dieser Lagerbunker 12 fungiert als Pufferspeicher für den anschließenden Ab- brennofen 13, in dem an den Dosenteilchen aus Aluminium anhaftende Farb- partikel thermisch gelöst und verbrannt werden. Der Abbrennofen 13 ist dabei als thermische Reinigungstrommel ausgeführt und die in dieser entstehenden Abgase werden in einem Filter 14 gereinigt und ggf. nach verbrannt. Die dabei entstehende Energie kann beispielsweise auch benutzt werden, um die thermische Reinigungstrommel des Abbrennofens 13 zu beheizen.
Die derart gereinigten Dosenteilchen werden abschließend in einen Schmelzofen 15 eingebracht. Dieses Einbringen erfolgt kontinuierlich und unter einem ständigen Rühren des flüssigen Schmelzbades. Durch dieses ständige Rühren wird erreicht, dass die einzelnen Dosenteilchen nicht auf der Schmelze auf- schwimmen sondern direkt in das flüssige Schmelzbad eingerührt werden und dort vollständig von flüssiger Schmelze umgeben sind. Hierdurch wird ein zügiges Aufschmelzen der Aluminiumteilchen erreicht, wodurch die unerwünschte Bildung von Oxidschichten am Aluminium verhindert wird und sich eine insgesamt sehr hohe Aluminiumausbeute bei dem Recyclingverfahren ergibt.
This storage bunker 12 acts as a buffer for the subsequent kiln 13, in which color particles adhering to the aluminum doses are thermally dissolved and burnt. The Abbrennofen 13 is designed as a thermal cleaning drum and the resulting exhaust gases are cleaned in a filter 14 and possibly burned after. The resulting energy can also be used, for example, to heat the thermal cleaning drum of the Abbrennofens 13. The thus cleaned can particles are finally introduced into a melting furnace 15. This introduction takes place continuously and with constant stirring of the liquid melt bath. This constant stirring ensures that the individual can particles do not float on the melt but are stirred directly into the liquid melt bath and are completely surrounded by liquid melt there. As a result, a rapid melting of the aluminum particles is achieved, whereby the unwanted formation of oxide layers is prevented on the aluminum and results in a very high overall aluminum yield in the recycling process.
Claims
Ansprüche 1 . Verfahren zum Recyclen von Aluminium aus Getränkedosen mit den Schritten Claims 1. Process for recycling aluminum from beverage cans with the steps
- Zerkleinern der Dosen zu kleinen Teilchen - Shredding the cans into small particles
Reinigung der Teilchen und Purification of the particles and
- einer anschließenden Weiterverarbeitung, - a subsequent further processing,
dadurch gekennzeichnet, characterized,
dass die Reinigung der Teilchen zweistufig erfolgt, that the purification of the particles takes place in two stages,
- zunächst mit einer Schleuderstufe und - first with a spin stage and
- mit einer nachgeschalteten thermischen Abbrennstufe. - With a downstream thermal Abbrennstufe.
2. Verfahren gemäß Anspruch 1 , 2. Method according to claim 1,
dadurch gekennzeichnet, characterized,
dass die anschließende Weiterverarbeitung das Einbringen der gereinigten Teilchen in ein Schmelzbad umfasst. the subsequent further processing comprises introducing the cleaned particles into a molten bath.
3. Verfahren gemäß Anspruch 1 , 3. Method according to claim 1,
dadurch gekennzeichnet, characterized,
dass vor der Schleuderstufe den Teilchen ein Lösungsmittel zugesetzt wird. that a solvent is added to the particles before the spin stage.
4. Verfahren gemäß Anspruch 3, 4. The method according to claim 3,
dadurch gekennzeichnet, characterized,
dass das Lösungsmittel Wasser (H20) ist. that the solvent is water (H 2 0).
5. Verfahren gemäß Anspruch 2, 5. The method according to claim 2,
dadurch gekennzeichnet, characterized,
dass der thermischen Abbrennstufe ein Lagerbunker als Pufferspeicher vorgeschaltet ist. that the thermal combustion stage is preceded by a storage bunker as a buffer memory.
6. Verfahren gemäß Anspruch 2, 6. The method according to claim 2,
dadurch gekennzeichnet, characterized,
dass aus der Abbrennstufe kommenden Teilchen direkt in ein flüssiges that coming from the combustion stage particles directly into a liquid
Schmelzbad eingerührt werden. Melt bath are stirred.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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DE102009041789.3 | 2009-09-18 | ||
DE102009041789A DE102009041789A1 (en) | 2009-09-18 | 2009-09-18 | Process for recycling aluminum from beverage cans |
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WO2011032696A1 true WO2011032696A1 (en) | 2011-03-24 |
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PCT/EP2010/005681 WO2011032696A1 (en) | 2009-09-18 | 2010-09-16 | Method for recycling aluminium from drink cans |
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WO (1) | WO2011032696A1 (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2014015539A1 (en) * | 2012-07-26 | 2014-01-30 | 北京科技大学 | Method of recycling of waste easy-open aluminum cans |
CN105648221A (en) * | 2016-03-02 | 2016-06-08 | 江阴迪新金属工业有限公司 | Rod casting system and method for recycling and smelting long scrap aluminum materials |
EP3243574A1 (en) * | 2016-05-02 | 2017-11-15 | Hydro Aluminium Rolled Products GmbH | Recycling installation and recycling method for treating aluminium scrap |
WO2018015492A1 (en) | 2016-07-22 | 2018-01-25 | Centre De Recherches Metallurgiques Asbl - Centrum Voor Research In De Metallurgie Vzw | Production of titrated metallurgical additives for the steel industry, foundries and the non-ferrous sector |
BE1024531B1 (en) * | 2016-09-01 | 2018-04-03 | Centre de Recherches Metallurgiques asbl- Centrum Voor Research in de Metallurgie vzw | MANUFACTURE OF METALLURGICAL ADDITIVES TITLEED FOR STEELWORK, FOUNDRIES AND THE NON-FERROUS SECTOR |
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CN109161693A (en) * | 2018-10-31 | 2019-01-08 | 中信戴卡股份有限公司 | A kind of aluminium skimmings melt down device and technique online |
CN111644408A (en) * | 2020-06-16 | 2020-09-11 | 沈永成 | Building metal waste recycling equipment with die-casting forming mechanism |
CN111889634A (en) * | 2020-07-24 | 2020-11-06 | 都江堰川相铝业有限公司 | Aluminum ingot smelting system and smelting process |
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DE2151819B1 (en) * | 1971-10-18 | 1973-05-03 | Hutt Gmbh | Briquettes prepn from moist metal turnings - prior to scrap resmelting |
WO1987000259A1 (en) * | 1985-06-28 | 1987-01-15 | Aluminum Company Of America | Process and apparatus for removing volatiles from metal |
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Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2014015539A1 (en) * | 2012-07-26 | 2014-01-30 | 北京科技大学 | Method of recycling of waste easy-open aluminum cans |
CN105648221A (en) * | 2016-03-02 | 2016-06-08 | 江阴迪新金属工业有限公司 | Rod casting system and method for recycling and smelting long scrap aluminum materials |
EP3243574A1 (en) * | 2016-05-02 | 2017-11-15 | Hydro Aluminium Rolled Products GmbH | Recycling installation and recycling method for treating aluminium scrap |
WO2018015492A1 (en) | 2016-07-22 | 2018-01-25 | Centre De Recherches Metallurgiques Asbl - Centrum Voor Research In De Metallurgie Vzw | Production of titrated metallurgical additives for the steel industry, foundries and the non-ferrous sector |
BE1024531B1 (en) * | 2016-09-01 | 2018-04-03 | Centre de Recherches Metallurgiques asbl- Centrum Voor Research in de Metallurgie vzw | MANUFACTURE OF METALLURGICAL ADDITIVES TITLEED FOR STEELWORK, FOUNDRIES AND THE NON-FERROUS SECTOR |
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