CA2227126A1 - Process and device for melting light metals - Google Patents
Process and device for melting light metals Download PDFInfo
- Publication number
- CA2227126A1 CA2227126A1 CA 2227126 CA2227126A CA2227126A1 CA 2227126 A1 CA2227126 A1 CA 2227126A1 CA 2227126 CA2227126 CA 2227126 CA 2227126 A CA2227126 A CA 2227126A CA 2227126 A1 CA2227126 A1 CA 2227126A1
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- CA
- Canada
- Prior art keywords
- light metal
- metal parts
- waste gas
- gases
- pipe
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B3/00—Hearth-type furnaces, e.g. of reverberatory type; Tank furnaces
- F27B3/10—Details, accessories, or equipment peculiar to hearth-type furnaces
- F27B3/18—Arrangements of devices for charging
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/56—Manufacture of steel by other methods
- C21C5/562—Manufacture of steel by other methods starting from scrap
- C21C5/565—Preheating of scrap
-
- 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
- C22B21/0084—Obtaining aluminium melting and handling molten aluminium
- C22B21/0092—Remelting scrap, skimmings or any secondary source aluminium
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D13/00—Apparatus for preheating charges; Arrangements for preheating charges
- F27D13/002—Preheating scrap
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D3/00—Charging; Discharging; Manipulation of charge
- F27D3/0025—Charging or loading melting furnaces with material in the solid state
- F27D3/0032—Charging or loading melting furnaces with material in the solid state using an air-lock
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Materials 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)
- Gasification And Melting Of Waste (AREA)
- Processing Of Solid Wastes (AREA)
- Vertical, Hearth, Or Arc Furnaces (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
- Chimneys And Flues (AREA)
Abstract
To prevent environmental pollution during continuous melting of waste contaminated with organic substances and the like, it is provided that these be introduced into an overheated and moved molten metal (11) from a sealable housing (2) via conveying means (3) of a feed device and melted, whereby the harmful substances of the gases and vapours, produced during heating until the light metal parts are melted, are at least partially neutralized or separated in a waste gas purifier or separator (5) and/or conveyed to a high-temperature facility (8) and burned in it.
Description
Process and Device for Nelting Light Metal~
The invention concerns a process for the preferably continuous melting of light metal parts which are small and/or have a small diameter, in particular scraps contaminated with organic substances, for example, metal cuttings resulting from a machining of workpieces or crushed beverage cans made of aluminum and aluminum alloys.
Furthermore, the invention comprises a device, in particular for carrying out the above process, essentially having a heatable metallurgical melting crucible and equipment for feeding the light metal parts below the melting surface by means of a conveyor pipe.
Structural parts, small elements, vessels, containers and similar parts are increasingly made of light metals, in particular aluminum and aluminum alloys. Light metals have the advantages of good machinability and workability, are resistant to corrosion and splinterproof, neutral with respect to taste and advantageously have a low specific weight.
During manufacture of the parts, scrap pieces are produced naturally or cutting waste is produced during turning, milling, boring and the like. Light metal scrap, which also includes empty beverage cans, preserving cans, containers as well as cut pieces among other things, represents an important and ,economic base material for liquid metal recovery because recycling of these materials is extremely energy-saving.
Furt]hermore, recovery of light metals from scrap is associated with ecological relief, advantages in waste management and largl_ly avoids waste disposal costs for the metal.
CA 02227126 1998-01-1~
When melting scrap, in particular with a high ratio of surface to weight, i.e. fine or small scrap pieces, however, high oxidation losses occur when exposed to air because light meta:Ls have a very hiqh affinity for oxygen. However, not only the metal yield is reduced by the oxidation, as a result of which it deteriorates, but it also adds to the occurrence of slag or waste scrapings which brings about an increase in disposal problems for this material.
To minimize oxidation, it is known (US Patent No. 4702768 and Submerge Melt Technique for Aluminum Scrap, Light Metals 1992.
San Diego, California, USA, 1-5 Mar. 1992, The Minerals, Metals & Materials Society, 420 Commonwealth Dr., Warrendale, Pennsylvania 15086, USA, 1992, 9206-72-273, 877-879), to press aluminum cuttings through tubular insertion means below the surface in a liquid melt and thus largely avoid cinder losses, whereby a high metal yield is attained when melting the light scrap.
Light metal scrap, whether cutting scrap with machining oils or tin scrap with partially decorative lacquer coatings or content residues, is in most cases contaminated with organic compounds. These substances adhering to the scrap form problematic and/or toxic volatile reaction products when being heateld to the melting temperature of the metal and can result in considerable environmental pollution. To avoid these environmental pollutions, it may be necessary, especially when melting scrap in the metallurgical plant, to collect and purify the waste gases produced which, due to the considerable amounts of gas, does not take place completely in most cases and/or is associated with a high expenditure.
For melting beverage cans, it has already been proposed and CA 02227126 1998-01-1~
proven, as is known from the literature (Aluminium Beverage Can Recycling in Sweden by Lage Knuttson and Gosta Sjoberg, presented at The Recycling of Metals, D~sseldorf, 13 - 15 May 1992~l, in a first step, to remove the lacquer in a separate, essentially closed furnace by annealing the charge and to melt the scrap treated in this way in a second step. The contaminants produced thereby in the waste gases are partially burned, then neutralized by chemical reactions, separated and disposed of.
By means of an additional step in scrap processing or purification prior to melting, together with an intensive treat;ment of the waste gases by the treatment and melt aggregates, the environmental pollutions can, in particular during utilization of contaminated scrap, be quite effectively counteracted, however, this is very time-consuming and requires great technical and financial expenditures because high waste gas volumes must be treated or purified.
It ic the object of the present invention to now create a process and a device of the aforementioned type which make it possible to melt light metal parts, in particular contaminated light metal scrap, in an econmic and environmentally safe manner.
In a generic process of this type, this object is solved there]by that the light metals are introduced into an overheated and flowing molten metal from a sealable or closed housing of a feed device via conveying means and melted while air o:r oxygen is prevented from entering, whereby the gases and vapours, produced during heating until the parts are melted, are discharged from the conveyor pipe and sealable housing, inserted into a waste gas purification unit or CA 02227126 1998-01-1~
separator and the components of the gases and vapours are at least: partially separated and/or conveyed to a high-temperature unit and burned.
The a,dvantages of the new process lie, in particular, therein that a high melting speed can be attained by the overheated molten metal flowing about the scrap parts and thus also correspondingly high feed or performance rates of scrap through the conveyor pipe can also be attained for technical reasc,ns associated with melting. When heating the compact scrap, pieces being moved to the molten metal in the conveyor pipe, the volatile components formed and reaction products of the contamination substances are, deespite the high performance rates, led in the opposite direction, introduced into the housing, then removed therefrom and conveyed to a separator. These gases and vapours thereby protect the components or the portions remaining after a condensation of the gases and vapours produced heating the light metal parts are burned, in particular flared.
To safely separate environmental poisons, it may also be advantageous if the atmospheric pressure in the conveyor pipe is set and regulated, in particular by means of a pressure governor in the tube connection to the waste gas combustion instaLlation, in such a way that no gas and vapours formed durinq heating of the light metal parts escape from the conveyor pipe at the melting end.
In an installation of the aforementioned type, the further object: of the invention is solved thereby that, to prevent environmental pollution or, when separating problematic and/or toxic substances produced during heating, the conveyor pipe coming into contact with the molten metal or projecting into -CA 02227126 1998-01-1~
it i'3 connected in a gastight manner with a sealable housing of a feed device for small light metal parts, said housing having at least one inlet sluice for a charging of the feed device and at least one connection for a waste gas discharge pipe, whereby the connected discharge pipe opens into at least one w~aste gas purifier or separator with a substance discharge and the purifier(s) or separator(s) has (have) a pipe connection with a waste gas combustion plant at the outlet end via a pressure governor or the connected discharge pipe is connected directly to a waste gas combustion plant.
The advantages of the facility designed in this way according to the invention can essentially be seen therein that, even for a high efficiency of the separation of the environmental poisons or of the emission which disadvantageously affects the environment during melting of light metal scrap, the overall dimensions and expenditures of the installation can be kept small. This also results in a high flexibility, low costs for a retrofitting of existing installations and, on the whole, especially advantageous aspects for an energy-saving utilization of light metal scrap with a further competency increase in waste management.
It is thereby essential to the invention that the connection of the conveyor pipe to the housing, the feed device or the inlet sluice for the light metal scrap and the separator are connected to one another so as to be gastight and/or exhibit a lower inside gas pressure in comparison with the atmospheric pressure. The equipment parts are thereby made of materials which withstand the respective temperature and/or corrosion demancils. A neutralization of the separated discharge substances and a burning or flaring of the residual gases are known from chemical and system engineering.
CA 02227126 1998-01-1~
An especially effective embodiment of the facility is attained when the separator for the components of the gases and vapours formed during heating of the light metal parts is a condenser.
In this case, the gas can be cooled at selective temperatures and pressure, if necessary, in a cascade-like manner, and result in desired fractions.
With respect to a safe and continuous supply of the light metal scrap, it can finally be advantageous if the device for feeding the light metal parts is made essentially in the form of a screw conveyor.
The invention shall be described in greater detail in the following with reference to a drawing showing only one embodiment.
Fig. 1 schematically illustrates a device for continuously melting light metal scrap.
Liqui~l light metal 11 is situated in a melting crucible 1 which has, at least in the area A of a feed for solid light metal scrap, a relative movement 12 to the latter. A finely reduced, perhaps compact scrap is introduced under the surface of the melt 11 through a conveyor pipe 3 or the like, whereby pipe 3 has, on the one hand, an insoluble insert piece, on the other hand, is connected with a sealable housing 2 so as to be gastight. The sealable housing 2 is connected with a sluice 21 or a sluice system which enable or enables scrap to be brought in, for example aluminum cutting scrap, without environmentally harmful volatile substances escaping from the housing 2. A known feed device is located in the housing 2, perhaps sealed, in which the light metal scrap is inserted and by means of which the latter is also discharged through a conveyor 3 or pipe, perhaps by means of a screw conveyor or CA 02227126 1998-01-1~
the like. The housing 2 is also connected with a separator 5 via a waste gas discharge pipe 4, said separator 5 comprising a substance discharge 6 for e.g. condensates or similar harmful substances. Following the path of the gas, a pressure governor 7, by means of which a gas pressure can be set in the marshalled system, is situated between separator 5 and a waste gas combustion plant 8. For example, the gas pressure in the sealed housing 2 can be set with aid of the pressure governor 7 and subsequently at the outlet of the conveyor pipe 3 in such a way that no volatile pollutants which result from a breakdown of the contaminations of the scrap, can escape into the environment. A pressure governor 7 can also be placed in the area of the discharge pipe 4, so that specific waste gas fractions can be separated by condensation in a coolable separator 5. Due to the low waste gas volumes which can be attained with the device of the invention or with the process of the invention during melting of contaminated fine scrap, it can also be possible to connect a discharge pipe 4 from the sealable housing 2 directly to a pressure governor 7 and to make these harmless for the environment directly by flaring, without separation or partial separation of pollutants.
The invention concerns a process for the preferably continuous melting of light metal parts which are small and/or have a small diameter, in particular scraps contaminated with organic substances, for example, metal cuttings resulting from a machining of workpieces or crushed beverage cans made of aluminum and aluminum alloys.
Furthermore, the invention comprises a device, in particular for carrying out the above process, essentially having a heatable metallurgical melting crucible and equipment for feeding the light metal parts below the melting surface by means of a conveyor pipe.
Structural parts, small elements, vessels, containers and similar parts are increasingly made of light metals, in particular aluminum and aluminum alloys. Light metals have the advantages of good machinability and workability, are resistant to corrosion and splinterproof, neutral with respect to taste and advantageously have a low specific weight.
During manufacture of the parts, scrap pieces are produced naturally or cutting waste is produced during turning, milling, boring and the like. Light metal scrap, which also includes empty beverage cans, preserving cans, containers as well as cut pieces among other things, represents an important and ,economic base material for liquid metal recovery because recycling of these materials is extremely energy-saving.
Furt]hermore, recovery of light metals from scrap is associated with ecological relief, advantages in waste management and largl_ly avoids waste disposal costs for the metal.
CA 02227126 1998-01-1~
When melting scrap, in particular with a high ratio of surface to weight, i.e. fine or small scrap pieces, however, high oxidation losses occur when exposed to air because light meta:Ls have a very hiqh affinity for oxygen. However, not only the metal yield is reduced by the oxidation, as a result of which it deteriorates, but it also adds to the occurrence of slag or waste scrapings which brings about an increase in disposal problems for this material.
To minimize oxidation, it is known (US Patent No. 4702768 and Submerge Melt Technique for Aluminum Scrap, Light Metals 1992.
San Diego, California, USA, 1-5 Mar. 1992, The Minerals, Metals & Materials Society, 420 Commonwealth Dr., Warrendale, Pennsylvania 15086, USA, 1992, 9206-72-273, 877-879), to press aluminum cuttings through tubular insertion means below the surface in a liquid melt and thus largely avoid cinder losses, whereby a high metal yield is attained when melting the light scrap.
Light metal scrap, whether cutting scrap with machining oils or tin scrap with partially decorative lacquer coatings or content residues, is in most cases contaminated with organic compounds. These substances adhering to the scrap form problematic and/or toxic volatile reaction products when being heateld to the melting temperature of the metal and can result in considerable environmental pollution. To avoid these environmental pollutions, it may be necessary, especially when melting scrap in the metallurgical plant, to collect and purify the waste gases produced which, due to the considerable amounts of gas, does not take place completely in most cases and/or is associated with a high expenditure.
For melting beverage cans, it has already been proposed and CA 02227126 1998-01-1~
proven, as is known from the literature (Aluminium Beverage Can Recycling in Sweden by Lage Knuttson and Gosta Sjoberg, presented at The Recycling of Metals, D~sseldorf, 13 - 15 May 1992~l, in a first step, to remove the lacquer in a separate, essentially closed furnace by annealing the charge and to melt the scrap treated in this way in a second step. The contaminants produced thereby in the waste gases are partially burned, then neutralized by chemical reactions, separated and disposed of.
By means of an additional step in scrap processing or purification prior to melting, together with an intensive treat;ment of the waste gases by the treatment and melt aggregates, the environmental pollutions can, in particular during utilization of contaminated scrap, be quite effectively counteracted, however, this is very time-consuming and requires great technical and financial expenditures because high waste gas volumes must be treated or purified.
It ic the object of the present invention to now create a process and a device of the aforementioned type which make it possible to melt light metal parts, in particular contaminated light metal scrap, in an econmic and environmentally safe manner.
In a generic process of this type, this object is solved there]by that the light metals are introduced into an overheated and flowing molten metal from a sealable or closed housing of a feed device via conveying means and melted while air o:r oxygen is prevented from entering, whereby the gases and vapours, produced during heating until the parts are melted, are discharged from the conveyor pipe and sealable housing, inserted into a waste gas purification unit or CA 02227126 1998-01-1~
separator and the components of the gases and vapours are at least: partially separated and/or conveyed to a high-temperature unit and burned.
The a,dvantages of the new process lie, in particular, therein that a high melting speed can be attained by the overheated molten metal flowing about the scrap parts and thus also correspondingly high feed or performance rates of scrap through the conveyor pipe can also be attained for technical reasc,ns associated with melting. When heating the compact scrap, pieces being moved to the molten metal in the conveyor pipe, the volatile components formed and reaction products of the contamination substances are, deespite the high performance rates, led in the opposite direction, introduced into the housing, then removed therefrom and conveyed to a separator. These gases and vapours thereby protect the components or the portions remaining after a condensation of the gases and vapours produced heating the light metal parts are burned, in particular flared.
To safely separate environmental poisons, it may also be advantageous if the atmospheric pressure in the conveyor pipe is set and regulated, in particular by means of a pressure governor in the tube connection to the waste gas combustion instaLlation, in such a way that no gas and vapours formed durinq heating of the light metal parts escape from the conveyor pipe at the melting end.
In an installation of the aforementioned type, the further object: of the invention is solved thereby that, to prevent environmental pollution or, when separating problematic and/or toxic substances produced during heating, the conveyor pipe coming into contact with the molten metal or projecting into -CA 02227126 1998-01-1~
it i'3 connected in a gastight manner with a sealable housing of a feed device for small light metal parts, said housing having at least one inlet sluice for a charging of the feed device and at least one connection for a waste gas discharge pipe, whereby the connected discharge pipe opens into at least one w~aste gas purifier or separator with a substance discharge and the purifier(s) or separator(s) has (have) a pipe connection with a waste gas combustion plant at the outlet end via a pressure governor or the connected discharge pipe is connected directly to a waste gas combustion plant.
The advantages of the facility designed in this way according to the invention can essentially be seen therein that, even for a high efficiency of the separation of the environmental poisons or of the emission which disadvantageously affects the environment during melting of light metal scrap, the overall dimensions and expenditures of the installation can be kept small. This also results in a high flexibility, low costs for a retrofitting of existing installations and, on the whole, especially advantageous aspects for an energy-saving utilization of light metal scrap with a further competency increase in waste management.
It is thereby essential to the invention that the connection of the conveyor pipe to the housing, the feed device or the inlet sluice for the light metal scrap and the separator are connected to one another so as to be gastight and/or exhibit a lower inside gas pressure in comparison with the atmospheric pressure. The equipment parts are thereby made of materials which withstand the respective temperature and/or corrosion demancils. A neutralization of the separated discharge substances and a burning or flaring of the residual gases are known from chemical and system engineering.
CA 02227126 1998-01-1~
An especially effective embodiment of the facility is attained when the separator for the components of the gases and vapours formed during heating of the light metal parts is a condenser.
In this case, the gas can be cooled at selective temperatures and pressure, if necessary, in a cascade-like manner, and result in desired fractions.
With respect to a safe and continuous supply of the light metal scrap, it can finally be advantageous if the device for feeding the light metal parts is made essentially in the form of a screw conveyor.
The invention shall be described in greater detail in the following with reference to a drawing showing only one embodiment.
Fig. 1 schematically illustrates a device for continuously melting light metal scrap.
Liqui~l light metal 11 is situated in a melting crucible 1 which has, at least in the area A of a feed for solid light metal scrap, a relative movement 12 to the latter. A finely reduced, perhaps compact scrap is introduced under the surface of the melt 11 through a conveyor pipe 3 or the like, whereby pipe 3 has, on the one hand, an insoluble insert piece, on the other hand, is connected with a sealable housing 2 so as to be gastight. The sealable housing 2 is connected with a sluice 21 or a sluice system which enable or enables scrap to be brought in, for example aluminum cutting scrap, without environmentally harmful volatile substances escaping from the housing 2. A known feed device is located in the housing 2, perhaps sealed, in which the light metal scrap is inserted and by means of which the latter is also discharged through a conveyor 3 or pipe, perhaps by means of a screw conveyor or CA 02227126 1998-01-1~
the like. The housing 2 is also connected with a separator 5 via a waste gas discharge pipe 4, said separator 5 comprising a substance discharge 6 for e.g. condensates or similar harmful substances. Following the path of the gas, a pressure governor 7, by means of which a gas pressure can be set in the marshalled system, is situated between separator 5 and a waste gas combustion plant 8. For example, the gas pressure in the sealed housing 2 can be set with aid of the pressure governor 7 and subsequently at the outlet of the conveyor pipe 3 in such a way that no volatile pollutants which result from a breakdown of the contaminations of the scrap, can escape into the environment. A pressure governor 7 can also be placed in the area of the discharge pipe 4, so that specific waste gas fractions can be separated by condensation in a coolable separator 5. Due to the low waste gas volumes which can be attained with the device of the invention or with the process of the invention during melting of contaminated fine scrap, it can also be possible to connect a discharge pipe 4 from the sealable housing 2 directly to a pressure governor 7 and to make these harmless for the environment directly by flaring, without separation or partial separation of pollutants.
Claims (10)
1. Process for the preferably continuous melting of light metal parts which are small and/or have a small cross-section, in particular of waste contaminated with organic substances, for example, metal cuttings resulting from a machining of workpieces and/or similar scrap such as empty, perhaps reduced or crushed beverage cans made of aluminum and aluminum alloys, characterized therein that the light metal parts (A) are introduced into an overheated and flowing molten metal (11) from a sealable or closed housing (2) of a feed device by conveying means (3) while preventing air or oxygen from entering and are melted, whereby the gases and vapours produced during heating the parts until melted are discharged from the conveyor pipe (3) and housing (2), introduced into a waste gas purifier or separator (5) and the components of the gases and vapours are at least partially separated and/or fed to a high-temperature installation (8) and burned.
2. Process according to claim 1, characterized therein, that the molten metal (11) is heated to a temperature of at least 5°C, in particular of at least 20°C, above the liquidating temperature of the alloy and that the solid light metal parts (A) are subjected to a movement of at least 1.2 m/min at the inlet point.
3. Process according to claim 1 or 2, characterized therein that the light metal parts are intermittently charged into the housing (2) of the feed device by means of an inlet sluice 21, preferably while avoiding the escape of gas, forming a required supply, and is fed largely continuously to a molten metal (11).
4. Process according to one of the claims 1 to 3, characterized therein that the components of the gases and vapours, produced by heating the light metal parts contaminated with organic substances, are at least partially separated in a separating device in the form of a condenser unit (5) and the substances are then neutralized and disposed of in the discharge (6).
5. Process according to one of the claims 1 to 4, characterized therein that the components, or the parts remaining after a condensation, of the gases and vapours produced during heating of the light metal parts are burned, in particular flared.
6. Process according to one of the claims 1 to 5, characterized therein that the atmospheric pressure in the conveyor pipe (3) is set and controlled by means of a pressure governor (7) in the pipe connection to the waste gas combustion plant (8) in such a way that essentially none of the gases and vapours formed during heating of the light metal parts (A) escape from the conveyor pipe (3) at the melting end.
7. Device for preferably continuously melting light metal parts (A) which are small and/or have a small cross-section, in particular waste contaminated with organic substances, for example, metal cuttings resulting from machining of workpieces and/or similar scrap, such as empty, perhaps reduced or crushed beverage cans made of aluminum and aluminum alloys, essentially having a heatable metallurgical melting crucible (1) and a device for feeding the light metal parts below the melting surface by means of a conveyor pipe (3) or the like, in particular for carrying out the process according to one of the claims 1 to 6, characterized therein that the conveyor pipe (3) coming in contact with the molten metal (11) or protruding into it is connected with a sealable housing (2) of a feed device for small light metal parts (A) so as to be essentially gastight, said housing (2) having at least one inlet sluice (21) for charging the feed device and at least one connection for a waste gas disposal pipe (4), whereby the attached discharge pipe (4) opens into at least one waste gas purifier or separator (5) with a substance discharge (6) and the purifier(s) or separator(s) (5) has (have) a pipe connection with a waste gas combustion installation (8) via a pressure governor (7) at the outlet end or the connected discharge pipe (4) is connected directly to a waste gas combustion installation (8).
8. Device according to claim 7, characterized therein that the separator (5) for components of gases and vapours formed during heating of the light metal parts is in the form of a condenser.
9. Device according to claim 7 or 8, characterized therein that the waste gas combustion installation (8) is in the form of a flaring device.
10. Device according to one of the claims 7 to 9, characterized therein that the device for feeding the light metal parts is essentially in the form of a screw conveyor.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AT0005597A AT404843B (en) | 1997-01-15 | 1997-01-15 | METHOD AND DEVICE FOR MELTING LIGHT METALS |
| AT55/97 | 1997-01-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2227126A1 true CA2227126A1 (en) | 1998-07-15 |
Family
ID=3480340
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2227126 Abandoned CA2227126A1 (en) | 1997-01-15 | 1998-01-15 | Process and device for melting light metals |
Country Status (9)
| Country | Link |
|---|---|
| EP (1) | EP0854198A1 (en) |
| JP (1) | JPH10253268A (en) |
| AT (1) | AT404843B (en) |
| AU (1) | AU5208098A (en) |
| BR (1) | BR9800330A (en) |
| CA (1) | CA2227126A1 (en) |
| HU (1) | HUP9800058A3 (en) |
| NO (1) | NO980173L (en) |
| ZA (1) | ZA98252B (en) |
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| WO2022221903A1 (en) * | 2021-04-19 | 2022-10-27 | Dingo HPA Pty Ltd | Process for forming high purity alumina |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2796138B1 (en) * | 1999-07-07 | 2001-09-21 | Kvaerner Metals Clecim | PROCESS FOR MELTING A METAL MATERIAL AND PLANT FOR IMPLEMENTING THE PROCESS |
| US8556949B2 (en) | 2007-11-14 | 2013-10-15 | DePuy Synthes Products, LLC | Hybrid bone fixation element and methods of using the same |
| DE102009041789A1 (en) * | 2009-09-18 | 2011-03-31 | Klaus Riegert | Process for recycling aluminum from beverage cans |
| US9155578B2 (en) | 2012-02-28 | 2015-10-13 | DePuy Synthes Products, Inc. | Expandable fastener |
| CN114353519B (en) * | 2021-12-30 | 2023-11-14 | 浙江希缘金属包装有限公司 | Metal material smelting device for metal material processing |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3614079A (en) * | 1968-10-16 | 1971-10-19 | George Harrison | Method and apparatus for melting metal chips |
| DE1917631A1 (en) * | 1969-04-05 | 1970-10-08 | Diehl Fa | Melting process for metal machining work |
| DE1918368A1 (en) * | 1969-04-11 | 1970-10-15 | Diehl Fa | Smelting scrap metal with a crucible - furnace |
| US4264060A (en) * | 1977-02-25 | 1981-04-28 | Automated Production Systems Corporation | Apparatus for treating metallic scrap in the recovery of metal therefrom |
| US4160867A (en) * | 1977-05-17 | 1979-07-10 | Westinghouse Electric Corp. | Method and apparatus for melting machining chips |
| SE8303372L (en) * | 1983-06-14 | 1984-12-15 | Asea Ab | Oven device for smelting of metals or metal alloys |
| JPS6129686A (en) * | 1984-07-23 | 1986-02-10 | 合同製鐵株式会社 | Method and device for preheating scrap by exhaust gas from electric steel-making furnace |
| US4702768A (en) * | 1986-03-12 | 1987-10-27 | Pre-Melt Systems, Inc. | Process and apparatus for introducing metal chips into a molten metal bath thereof |
| US5705123A (en) * | 1994-12-15 | 1998-01-06 | Hayes Wheels International, Inc. | Metal chip reclamation system |
| GB2302167B (en) * | 1995-06-13 | 1998-11-04 | Nottingham Metal Recyclers Lim | Fragmentary scrap feed method and apparatus |
-
1997
- 1997-01-15 AT AT0005597A patent/AT404843B/en not_active IP Right Cessation
-
1998
- 1998-01-09 JP JP10033492A patent/JPH10253268A/en active Pending
- 1998-01-12 EP EP19980890005 patent/EP0854198A1/en not_active Withdrawn
- 1998-01-13 ZA ZA98252A patent/ZA98252B/en unknown
- 1998-01-14 NO NO980173A patent/NO980173L/en unknown
- 1998-01-14 HU HU9800058A patent/HUP9800058A3/en unknown
- 1998-01-15 CA CA 2227126 patent/CA2227126A1/en not_active Abandoned
- 1998-01-15 AU AU52080/98A patent/AU5208098A/en not_active Abandoned
- 1998-01-15 BR BR9800330A patent/BR9800330A/en not_active Application Discontinuation
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103602817A (en) * | 2013-11-13 | 2014-02-26 | 安徽省金盈铝业有限公司 | High/low two-furnace low-temperature pre-impurity-removal process for secondary aluminium |
| WO2022221903A1 (en) * | 2021-04-19 | 2022-10-27 | Dingo HPA Pty Ltd | Process for forming high purity alumina |
Also Published As
| Publication number | Publication date |
|---|---|
| NO980173L (en) | 1998-07-16 |
| JPH10253268A (en) | 1998-09-25 |
| HU9800058D0 (en) | 1998-03-30 |
| HUP9800058A3 (en) | 1999-08-30 |
| NO980173D0 (en) | 1998-01-14 |
| ZA98252B (en) | 1998-08-27 |
| AU5208098A (en) | 1998-07-23 |
| AT404843B (en) | 1999-03-25 |
| ATA5597A (en) | 1998-07-15 |
| EP0854198A1 (en) | 1998-07-22 |
| HUP9800058A2 (en) | 1998-10-28 |
| BR9800330A (en) | 1999-05-25 |
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Legal Events
| Date | Code | Title | Description |
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| FZDE | Discontinued |