US20100206128A1 - Method and device for removal of elements resolved in a metal melt - Google Patents
Method and device for removal of elements resolved in a metal melt Download PDFInfo
- Publication number
- US20100206128A1 US20100206128A1 US12/516,593 US51659307A US2010206128A1 US 20100206128 A1 US20100206128 A1 US 20100206128A1 US 51659307 A US51659307 A US 51659307A US 2010206128 A1 US2010206128 A1 US 2010206128A1
- Authority
- US
- United States
- Prior art keywords
- metal
- melt
- container
- level
- metal melt
- 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
-
- 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
- C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
- C22B9/04—Refining by applying a vacuum
-
- 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
- C22B21/06—Obtaining aluminium refining
-
- 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
- C22B21/06—Obtaining aluminium refining
- C22B21/068—Obtaining aluminium refining handling in vacuum
-
- 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
- C22B4/00—Electrothermal treatment of ores or metallurgical products for obtaining metals or alloys
- C22B4/08—Apparatus
-
- 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
- C22B9/00—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals
- C22B9/05—Refining by treating with gases, e.g. gas flushing also refining by means of a material generating gas in situ
Definitions
- the present invention relates to a method as stated in the introductory part of claim 1 , for removal of elements dissolved in metal melts. Particularly it relates to removal of dissolved metals, such as magnesium, from aluminium melts. Further it comprises a device for removal of such elements, as stated in the introductory part of claim 4 .
- MgCl2 which is a salt depositing on the melt surface together with Al2O3 slag, which is removed periodically.
- Such slag is transferred to melting works recovering aluminium, while the rest containing oxides, chlorides etc. normally is stored on land or is dumped at sea. This is undesirable for environmental reasons.
- the main object of the invention is to provide a method and a device for removal of undesirable metals from metal melts, reducing said problems. It is particularly an object to provide a method and a device for remelting aluminium containing magnesium, in which Mg is removed during the melting treatment. It is an object to provide a device being advantageously built, operated and maintained.
- the invention should be integrated in a device according to Norwegian patent specification 318848, with the general scheme of operation: In a hollow rotating body being immersed in a melt, an electrode conducting gas is arranged. Between the electrode and the melt a flame arch is burning, from which the heat energy is transferred directly to the melt.
- the invention may for example be used for removing of magnesium from aluminium melts.
- the magnesium vapour is mixed with further gas which is added in the rotor.
- the gas mixture is led through a vacuum exit to a condenser for depositing of liquid magnesium.
- the exhaust gas from the condenser is fed through a vacuum pump into the atmosphere.
- the emission is without CO2 gas. If the aluminium melt contains other alkalis they will evaporate correspondingly.
- FIG. 1 shows a connection between vapour pressure and temperature for some metals which could be in the melt
- FIG. 2 show a schematic side view of a plant comprising a device according to the invention, provided for removal of undesirable metals from an aluminium melt.
- the example is based on a device vaporizing magnesium directly from an aluminium melt without oxidizing Al and Mg.
- the device is provided for bringing heat energy to the melt.
- a diagram is showing the connection between temperature and vapour pressure for aluminium, magnesium and zinc in the range 700-1200° C. The diagram shows that the vapour of aluminium in this range is negligent to the vapour pressure for the other metals.
- FIG. 2 shows schematically a plant with a device according to the invention. It comprises a cylindrical or rectangular upright container 1 with an outlet in the container 1 in the form of an outlet conduit 2 .
- the melt treated flows through a tube 3 at the lower end of the outlet conduit 2 .
- the melt to be treated is transferred via a chute to a reservoir 24 and is sucked into the lower end container 1 through a tube 4 and is lifted by a sub pressure into the container provided by a vacuum pump 29 .
- the vacuum pump 29 is connected to a series of three condensers 27 being connected to the container 1 by a tube 5 .
- a rotor 6 is provided, powered by a motor 7 over a drive belt 8 or similar, to a pulley 9 attached to a tubular shaft connected to the rotor 6 .
- the motor is attached to a bracket 11 .
- the bracket 11 can be attached to the container 1 or to a separate rack.
- the sealing between the rotor shaft 10 and the container 1 is provided by a sealant 12 .
- the bracket 11 has a bearing 16 journaling the rotor shaft 10 .
- an electrode 13 is arranged, the upper end of which is connected to a cable with a cable shoe 14 .
- the electrical current which can be DC or AC, is transferred to the device through the cable shoe 14 and through an electrode connection 28 on the container 1 .
- the metal melt of the example is heated to a temperature between 800 and 1200° C., preferably ca. 1000° C. by the electrode 13 and 26 .
- the electrode 13 has a central bore for supplying gas from a connection 15 at the outer end of the electrode 13 .
- the gas supplied through the electrode 13 is preferably argon or nitrogen or a mixture thereof. Other gases may also be utilized.
- the gas over an upper melt level 21 will comprise of a mixture of gas supplied to the rotor and gas emitted from the melt.
- the gases emitted from the melt are hydrogen and the vapour of magnesium, zinc, sodium etc.
- the gases over the melt level 21 are extracted through the tube 5 to the condensers 27 , in which magnesium, zinc and sodium etc. are condensed to melts.
- the residual gas is fed through the vacuum pump 29 to the environment, possibly through a purification device.
- a ring 16 is arranged for acting as a sealant and an electrical insulation.
- the ring 16 has a passage for gas and particles through a tube 17 connected to a powder supply 18 .
- the reservoir 24 has a dividing wall 20 and a gatevalve 19 (the operation of which is not illustrated), to allow continuous handling of the melt, but the reservoir may also be a melting pot filled with melt.
- multiple holes 25 are arranged between the circumference and the melt level 23 .
- the level 23 of the melt in the rotor is governed by the gas pressure of the rotor 6 .
- the plant is started with the gate valve 19 closed and the reservoir 24 is filled to a certain level.
- gas is provided simultaneously through the electrode 13 and/or the ring 16 to the rotor 6 .
- the melt is brought to the level 21 .
- the rotor 5 is operated and the voltage from a rectifier or transformer is applied.
- the current is led through the cable shoe 14 to the electrode and through the contact 28 , alternatively through the rotor shaft 10 via a collector ring (not shown).
- a flame arch 22 is created between the electrode 13 and the top level of the melt 23 .
- the rotation of the rotor 6 will pump the heated melt in the rotor through the holes 25 and mix it into the melt of the container.
- the plant can comprise two, three or more containers in a series. Each container may have multiple rotors with a flame arch.
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Organic Chemistry (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Manufacturing & Machinery (AREA)
- Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
Method for removal of elements from a metal melt in a container, which melt contains a base metal and elements of undesirable constituents, in which the metal melt is heated to a level maintaining the content melted. The metal melt is heated to a level causing vaporization of an element to be removed, but under the level providing gas pressure for the base metal. The container with the metal melt is brought under a reduced pressure in at least one compartment in which the temperature is maintained under the vaporization level of the element to be removed. A device for the removal of elements from metal melts, with a container (1) for the metal melt, with an exit tube (5) over the level of the metal melt, for vapour from the interior of the container (1). The exit tube (5) exits into a compartment (27) which is kept at a temperature under the vaporization temperature, for condensing the vaporized metal.
Description
- The present invention relates to a method as stated in the introductory part of claim 1, for removal of elements dissolved in metal melts. Particularly it relates to removal of dissolved metals, such as magnesium, from aluminium melts. Further it comprises a device for removal of such elements, as stated in the introductory part of
claim 4. - On treating metals, the need for cleansing of a metal for another metal arises. This relates particularly to remelting of metals with impurities of one or more other metals. An example is at remelting of aluminium containing magnesium, Mg. To provide sufficient purity, the magnesium remnants in most cases should be removed. Currently, this is done by
- 1 Adding Cl2(g), which is reacting with Mg according to the equation: Mg+Cl2=MgCl2
- 2 By adding active salts reducing the Mg content.
- Common to both methods is the development of MgCl2, which is a salt depositing on the melt surface together with Al2O3 slag, which is removed periodically. Such slag is transferred to melting works recovering aluminium, while the rest containing oxides, chlorides etc. normally is stored on land or is dumped at sea. This is undesirable for environmental reasons.
- The main object of the invention is to provide a method and a device for removal of undesirable metals from metal melts, reducing said problems. It is particularly an object to provide a method and a device for remelting aluminium containing magnesium, in which Mg is removed during the melting treatment. It is an object to provide a device being advantageously built, operated and maintained.
- The invention should be integrated in a device according to Norwegian patent specification 318848, with the general scheme of operation: In a hollow rotating body being immersed in a melt, an electrode conducting gas is arranged. Between the electrode and the melt a flame arch is burning, from which the heat energy is transferred directly to the melt.
- In the following, the method according to the invention is stated in claim 1 and the device is correspondingly stated in
claim 4. Further features of the invention are stated in the remaining claims. - The invention may for example be used for removing of magnesium from aluminium melts.
- The magnesium vapour is mixed with further gas which is added in the rotor. The gas mixture is led through a vacuum exit to a condenser for depositing of liquid magnesium. The exhaust gas from the condenser is fed through a vacuum pump into the atmosphere. The emission is without CO2 gas. If the aluminium melt contains other alkalis they will evaporate correspondingly.
- The invention is described in more detail in the following and with reference to the figures, wherein
-
FIG. 1 shows a connection between vapour pressure and temperature for some metals which could be in the melt, while -
FIG. 2 show a schematic side view of a plant comprising a device according to the invention, provided for removal of undesirable metals from an aluminium melt. The example is based on a device vaporizing magnesium directly from an aluminium melt without oxidizing Al and Mg. The device is provided for bringing heat energy to the melt. InFIG. 1 a diagram is showing the connection between temperature and vapour pressure for aluminium, magnesium and zinc in the range 700-1200° C. The diagram shows that the vapour of aluminium in this range is negligent to the vapour pressure for the other metals. -
FIG. 2 shows schematically a plant with a device according to the invention. It comprises a cylindrical or rectangular upright container 1 with an outlet in the container 1 in the form of anoutlet conduit 2. The melt treated flows through a tube 3 at the lower end of theoutlet conduit 2. The melt to be treated is transferred via a chute to areservoir 24 and is sucked into the lower end container 1 through atube 4 and is lifted by a sub pressure into the container provided by avacuum pump 29. - The
vacuum pump 29 is connected to a series of threecondensers 27 being connected to the container 1 by atube 5. In the container 1, a rotor 6 is provided, powered by a motor 7 over a drive belt 8 or similar, to a pulley 9 attached to a tubular shaft connected to the rotor 6. The motor is attached to abracket 11. Thebracket 11 can be attached to the container 1 or to a separate rack. The sealing between the rotor shaft 10 and the container 1 is provided by asealant 12. Thebracket 11 has abearing 16 journaling the rotor shaft 10. Centrally in the shaft anelectrode 13 is arranged, the upper end of which is connected to a cable with acable shoe 14. The electrical current, which can be DC or AC, is transferred to the device through thecable shoe 14 and through anelectrode connection 28 on the container 1. - The metal melt of the example is heated to a temperature between 800 and 1200° C., preferably ca. 1000° C. by the
electrode 13 and 26. - The
electrode 13 has a central bore for supplying gas from aconnection 15 at the outer end of theelectrode 13. The gas supplied through theelectrode 13 is preferably argon or nitrogen or a mixture thereof. Other gases may also be utilized. The gas over anupper melt level 21 will comprise of a mixture of gas supplied to the rotor and gas emitted from the melt. The gases emitted from the melt are hydrogen and the vapour of magnesium, zinc, sodium etc. The gases over themelt level 21 are extracted through thetube 5 to thecondensers 27, in which magnesium, zinc and sodium etc. are condensed to melts. The residual gas is fed through thevacuum pump 29 to the environment, possibly through a purification device. - Between the rotor shaft 10 and the electrode 13 a
ring 16 is arranged for acting as a sealant and an electrical insulation. Thering 16 has a passage for gas and particles through atube 17 connected to apowder supply 18. Thereservoir 24 has a dividingwall 20 and a gatevalve 19 (the operation of which is not illustrated), to allow continuous handling of the melt, but the reservoir may also be a melting pot filled with melt. At the lower end of the rotor 6,multiple holes 25 are arranged between the circumference and themelt level 23. Thelevel 23 of the melt in the rotor is governed by the gas pressure of the rotor 6. - The plant is started with the
gate valve 19 closed and thereservoir 24 is filled to a certain level. When the vacuum is provided by thevacuum pump 29 through thecondensers 27 and thetube 5, gas is provided simultaneously through theelectrode 13 and/or thering 16 to the rotor 6. The melt is brought to thelevel 21. Therotor 5 is operated and the voltage from a rectifier or transformer is applied. The current is led through thecable shoe 14 to the electrode and through thecontact 28, alternatively through the rotor shaft 10 via a collector ring (not shown). Aflame arch 22 is created between theelectrode 13 and the top level of themelt 23. The rotation of the rotor 6 will pump the heated melt in the rotor through theholes 25 and mix it into the melt of the container. Simultaneously gas bubbles are created at the outlet of theholes 25. The gas bubbles, containing gases emitted from the melt, hydrogen and vapours of magnesium, zinc, sodium, etc. The gas bubbles are rising in the melt, through theupper level 21 and are released through thetube 5 and to thecondensers 27, wherein magnesium, zinc and sodium etc. are condensed to melts which can be drained through thevalve connection 30. Theholes 25 of the rotor 6 can be circular or polygonal, and be arranged at the lover end of the rotor, being notches therein. When the melt has reached a desirable temperature, thevalve 19 is opened and the metal may exit from the container 1 for further processing. The invention is not restricted to the example ofFIG. 2 . Thus, the plant can comprise two, three or more containers in a series. Each container may have multiple rotors with a flame arch.
Claims (4)
1. Method for removal of elements from a metal melt in a container, which melt contains a base metal and elements of undesirable constituents, in which the metal melt is heated to a level maintaining the content melted, with an electrode immersed into the container, characterized in that the metal melt is heated to a level causing vaporization of an element to be removed, but under the level providing gas pressure for the base metal, and that the container with the metal melt is brought under a reduced pressure in at least one compartment in which the temperature is maintained under the vaporization level of the element to be removed, and in that the gas is transported through a cascade arrangement with declining temperature in succeeding steps of the cascade.
2. (canceled)
3. Device for the removal of elements from metal melts, with a container (1) for the metal melt, which comprises a flame arch (22) for providing heat, and with an exit tube (5) over the level of the metal melt, for vapour from the interior of the container (1), characterized in that the exit tube (5) exits into a compartment (27) which is kept at a temperature under the vaporization temperature, for condensing the vaporized metal, and in that multiple compartments with declining temperature are arranged in a series, for condensing different metal vapours, the metal with the highest vaporization point being condensed in the first compartment and the metal with the lowest vaporization point being condensed in the last compartment.
4. (canceled)
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NO20065893 | 2006-12-13 | ||
NO20065893A NO329797B1 (en) | 2006-12-13 | 2006-12-13 | Method and apparatus for removing elements dissolved in metal melt |
PCT/NO2007/000437 WO2008079015A1 (en) | 2006-12-13 | 2007-12-12 | Method and device for removal of elements resolved in a metal melt |
Publications (1)
Publication Number | Publication Date |
---|---|
US20100206128A1 true US20100206128A1 (en) | 2010-08-19 |
Family
ID=39562718
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/516,593 Abandoned US20100206128A1 (en) | 2006-12-13 | 2007-12-12 | Method and device for removal of elements resolved in a metal melt |
Country Status (6)
Country | Link |
---|---|
US (1) | US20100206128A1 (en) |
EP (1) | EP2102378B1 (en) |
CA (1) | CA2671529C (en) |
ES (1) | ES2427162T3 (en) |
NO (1) | NO329797B1 (en) |
WO (1) | WO2008079015A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20150128765A1 (en) * | 2012-01-19 | 2015-05-14 | Eth Zurich | Process and apparatus for vacuum distillation of high-purity magnesium |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP7212664B2 (en) * | 2020-01-17 | 2023-01-25 | 株式会社豊田中央研究所 | Metal refining method and metal refining apparatus |
WO2021145398A1 (en) * | 2020-01-17 | 2021-07-22 | Kabushiki Kaisha Toyota Chuo Kenkyusho | Metal purifying method and metal purifying apparatus |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2021365A (en) * | 1933-07-31 | 1935-11-19 | Krupp Ag Grusonwerk | Apparatus for the fractional condensation of metal vapors in a condenser rotating about a horizontal axis |
US4842643A (en) * | 1986-05-06 | 1989-06-27 | Wijk Gijsbert W M Van | Apparatus for, purifying a melt, which, besides one or more impurities, essentially contains a light metal, in particular aluminum |
US5385601A (en) * | 1991-09-24 | 1995-01-31 | Electric Power Research Institute | Process for converting aluminum dross to ladle flux for steel processing |
US20020121158A1 (en) * | 2000-04-07 | 2002-09-05 | Mitsuhiro Otaki | Continuous vacuum refining method of molten metal and apparatus thereof |
WO2004076699A1 (en) * | 2003-02-25 | 2004-09-10 | Ingeniör Karl Venaas As | Device for heating a melt |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE974700C (en) * | 1950-08-21 | 1961-04-06 | Pechiney | Process and device for the production of pure aluminum by distillation |
GB1010436A (en) * | 1963-01-02 | 1965-11-17 | Imp Smelting Corp Ltd | Improvements in or relating to the condensation of zinc vapour by means of a zinc splash condenser |
JPH05302130A (en) * | 1992-04-24 | 1993-11-16 | Daido Steel Co Ltd | Apparatus for purifying metal |
JP3464380B2 (en) * | 1998-03-13 | 2003-11-10 | 古河電気工業株式会社 | Continuous vacuum purification method and device for aluminum alloy scrap |
-
2006
- 2006-12-13 NO NO20065893A patent/NO329797B1/en not_active IP Right Cessation
-
2007
- 2007-12-12 ES ES07851993T patent/ES2427162T3/en active Active
- 2007-12-12 WO PCT/NO2007/000437 patent/WO2008079015A1/en active Application Filing
- 2007-12-12 EP EP07851993.1A patent/EP2102378B1/en not_active Not-in-force
- 2007-12-12 US US12/516,593 patent/US20100206128A1/en not_active Abandoned
- 2007-12-12 CA CA2671529A patent/CA2671529C/en not_active Expired - Fee Related
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2021365A (en) * | 1933-07-31 | 1935-11-19 | Krupp Ag Grusonwerk | Apparatus for the fractional condensation of metal vapors in a condenser rotating about a horizontal axis |
US4842643A (en) * | 1986-05-06 | 1989-06-27 | Wijk Gijsbert W M Van | Apparatus for, purifying a melt, which, besides one or more impurities, essentially contains a light metal, in particular aluminum |
US5385601A (en) * | 1991-09-24 | 1995-01-31 | Electric Power Research Institute | Process for converting aluminum dross to ladle flux for steel processing |
US20020121158A1 (en) * | 2000-04-07 | 2002-09-05 | Mitsuhiro Otaki | Continuous vacuum refining method of molten metal and apparatus thereof |
US6607578B2 (en) * | 2000-04-07 | 2003-08-19 | Kobe Steel, Ltd. | Continuous vacuum refining method of molten metal and apparatus thereof |
WO2004076699A1 (en) * | 2003-02-25 | 2004-09-10 | Ingeniör Karl Venaas As | Device for heating a melt |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20150128765A1 (en) * | 2012-01-19 | 2015-05-14 | Eth Zurich | Process and apparatus for vacuum distillation of high-purity magnesium |
US9677151B2 (en) * | 2012-01-19 | 2017-06-13 | Eth Zuerich | Process and apparatus for vacuum distillation of high-purity magnesium |
US10551124B2 (en) | 2012-01-19 | 2020-02-04 | Eth Zuerich | Process and apparatus for vacuum distillation of high-purity magnesium |
Also Published As
Publication number | Publication date |
---|---|
EP2102378B1 (en) | 2013-06-19 |
NO20065893L (en) | 2008-06-16 |
ES2427162T3 (en) | 2013-10-29 |
EP2102378A1 (en) | 2009-09-23 |
NO329797B1 (en) | 2010-12-20 |
CA2671529A1 (en) | 2008-07-03 |
EP2102378A4 (en) | 2012-12-05 |
CA2671529C (en) | 2015-02-10 |
WO2008079015A1 (en) | 2008-07-03 |
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Legal Events
Date | Code | Title | Description |
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AS | Assignment |
Owner name: ALU INNOVATION AS, NORWAY Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:VENAAS, KARL;REEL/FRAME:028254/0282 Effective date: 20120503 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |