WO2008079015A1 - 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 PDF

Info

Publication number
WO2008079015A1
WO2008079015A1 PCT/NO2007/000437 NO2007000437W WO2008079015A1 WO 2008079015 A1 WO2008079015 A1 WO 2008079015A1 NO 2007000437 W NO2007000437 W NO 2007000437W WO 2008079015 A1 WO2008079015 A1 WO 2008079015A1
Authority
WO
WIPO (PCT)
Prior art keywords
metal
melt
container
level
metal melt
Prior art date
Application number
PCT/NO2007/000437
Other languages
French (fr)
Inventor
Karl Venaas
Original Assignee
Alu Innovation As
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Alu Innovation As filed Critical Alu Innovation As
Priority to EP07851993.1A priority Critical patent/EP2102378B1/en
Priority to CA2671529A priority patent/CA2671529C/en
Priority to ES07851993T priority patent/ES2427162T3/en
Priority to US12/516,593 priority patent/US20100206128A1/en
Publication of WO2008079015A1 publication Critical patent/WO2008079015A1/en

Links

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.
  • MgCI2 is a salt depositing on the melt surface together with AI2O3 slag, which is removed periodically.
  • 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 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.
  • Figure 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 0 C. The diagram shows that the vapour of aluminium in this range is negligent to the vapour pressure for the other metals.
  • Figure 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 0 C, preferably ca. 1000 0 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.
  • the vacuum is provided by the vacuum pump 29 through the condensers 27 and the tube 5
  • 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.
  • gas bubbles are created at the outlet of the holes 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 the upper level 21 and are released through the tube 5 and to the condensers 27, wherein magnesium, zinc and sodium etc. are condensed to melts which can be drained through the valve connection 30.
  • the holes 25 of the rotor 6 can be circular or polygonal, and be arranged at the lover end of the rotor, being notches therein.
  • 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

Method and device for removal of elements resolved in a metal melt
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.
Background
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 removedd. Currently, this is done by
1 Adding CI2(g), which is reacting with Mg according to the equation: Mg + CI2 =
MgCI2 2 By adding active salts reducing the Mg content.
Common to both methods is the development of MgCI2, which is a salt depositing on the melt surface together with AI2O3 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.
Object
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
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.
Example
The invention is described in more detail in the following and with reference to the figures, wherein Figure 1 shows a connection between vapour pressure and temperature for some metals which could be in the melt, while
Figure 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. In Figure 1 a diagram is showing the connection between temperature and vapour pressure for aluminium, magnesium and zinc in the range 700 - 1200 0C. The diagram shows that the vapour of aluminium in this range is negligent to the vapour pressure for the other metals. Figure 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. 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 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. Centrally in the shaft 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 0C, preferably ca. 1000 0C 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.
Between the rotor shaft 10 and the electrode 13 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. At the lower end of the rotor 6, 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. When the vacuum is provided by the vacuum pump 29 through the condensers 27 and the tube 5, 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. Simultaneously gas bubbles are created at the outlet of the holes 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 the upper level 21 and are released through the tube 5 and to the condensers 27, wherein magnesium, zinc and sodium etc. are condensed to melts which can be drained through the valve connection 30. The holes 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, the valve 19 is opened and the metal may exit from the container 1 for further processing.
The invention is not restricted to the example of Figure 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

Claims
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.
2. Method according to claim 1 , characterized in that the gas is transported through a cascade arrangement with declining temperature in succeeding steps of the cascade.
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.
4. Device according to claim 3, characterized in that multiple compartments (27) with declining temperature are arranged in a series, for condensing different metal vapours, the metal with the highest vaporization point is condensed in the first compartment (27) and the metal with the lowest vaporization point is condensed in the last chamber.
PCT/NO2007/000437 2006-12-13 2007-12-12 Method and device for removal of elements resolved in a metal melt WO2008079015A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP07851993.1A EP2102378B1 (en) 2006-12-13 2007-12-12 Method and device for removal of elements resolved in a metal melt
CA2671529A CA2671529C (en) 2006-12-13 2007-12-12 Method and device for removal of elements resolved in a metal melt
ES07851993T ES2427162T3 (en) 2006-12-13 2007-12-12 Method and device for the removal of dissolved elements in a metallic melt
US12/516,593 US20100206128A1 (en) 2006-12-13 2007-12-12 Method and device for removal of elements resolved in a metal melt

Applications Claiming Priority (2)

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

Publications (1)

Publication Number Publication Date
WO2008079015A1 true WO2008079015A1 (en) 2008-07-03

Family

ID=39562718

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NO2007/000437 WO2008079015A1 (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 (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021145398A1 (en) * 2020-01-17 2021-07-22 Kabushiki Kaisha Toyota Chuo Kenkyusho Metal purifying method and metal purifying apparatus
JP2021113355A (en) * 2020-01-17 2021-08-05 株式会社豊田中央研究所 Metal refining method and metal refining device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013107644A1 (en) 2012-01-19 2013-07-25 Eth Zurich Process and apparatus for vacuum distillation of high-purity magnesium

Citations (9)

* Cited by examiner, † Cited by third party
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
GB699934A (en) * 1950-08-21 1953-11-18 Pechiney Prod Chimiques Sa Improved process for producing aluminium by distillation from aluminium alloys or scrap
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
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
JPH05302130A (en) * 1992-04-24 1993-11-16 Daido Steel Co Ltd Apparatus for purifying metal
US5385601A (en) * 1991-09-24 1995-01-31 Electric Power Research Institute Process for converting aluminum dross to ladle flux for steel processing
JPH11256251A (en) * 1998-03-13 1999-09-21 Furukawa Electric Co Ltd:The Continuous vacuum-refining method of aluminum alloy waste and apparatus thereof
EP1225236A1 (en) * 2000-04-07 2002-07-24 Kobe Steel, Ltd. Process and apparatus for continuous vacuum purification of molten metal
WO2004076699A1 (en) * 2003-02-25 2004-09-10 Ingeniör Karl Venaas As Device for heating a melt

Patent Citations (9)

* Cited by examiner, † Cited by third party
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
GB699934A (en) * 1950-08-21 1953-11-18 Pechiney Prod Chimiques Sa Improved process for producing aluminium by distillation from aluminium alloys or scrap
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
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
JPH05302130A (en) * 1992-04-24 1993-11-16 Daido Steel Co Ltd Apparatus for purifying metal
JPH11256251A (en) * 1998-03-13 1999-09-21 Furukawa Electric Co Ltd:The Continuous vacuum-refining method of aluminum alloy waste and apparatus thereof
EP1225236A1 (en) * 2000-04-07 2002-07-24 Kobe Steel, Ltd. Process and apparatus for continuous vacuum purification of molten metal
WO2004076699A1 (en) * 2003-02-25 2004-09-10 Ingeniör Karl Venaas As Device for heating a melt

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of EP2102378A4 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021145398A1 (en) * 2020-01-17 2021-07-22 Kabushiki Kaisha Toyota Chuo Kenkyusho Metal purifying method and metal purifying apparatus
JP2021113355A (en) * 2020-01-17 2021-08-05 株式会社豊田中央研究所 Metal refining method and metal refining device
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

Also Published As

Publication number Publication date
CA2671529A1 (en) 2008-07-03
CA2671529C (en) 2015-02-10
US20100206128A1 (en) 2010-08-19
ES2427162T3 (en) 2013-10-29
EP2102378B1 (en) 2013-06-19
EP2102378A1 (en) 2009-09-23
NO20065893L (en) 2008-06-16
NO329797B1 (en) 2010-12-20
EP2102378A4 (en) 2012-12-05

Similar Documents

Publication Publication Date Title
US8241391B2 (en) Process and equipment for the treatment of loads or residues of non-ferrous metals and their alloys
CA2671529C (en) Method and device for removal of elements resolved in a metal melt
RU2455599C2 (en) Device and method for producing metals or metal compounds
WO2014037485A1 (en) A chamber cleaning method using f2 and a process for manufacture of f2 for this method
EP1873265A1 (en) Method of high-melting-point metal separation and recovery
JPH0368937B2 (en)
TW201231392A (en) Manufacturing method and apparatus of silicon, silicon wafer, and panel for solar cell
EP0152790B1 (en) Method of and apparatus for adding heat to molten metal, and also application of the method
JP2005097648A (en) Method for recovering magnesium-based alloy waste material
JP2021058878A (en) Cleaning waste liquid processing device and cleaning waste liquid processing method
EP1604046B1 (en) Device for heating a melt
JP2011206680A (en) Apparatus for plasma-melting asbestos
JP2006037146A (en) Dezincification method from metal scrap
US5513207A (en) Melting furnace and method
JP2005220444A (en) High purity metal, sputtering target composed of high purity metal, thin film deposited by sputtering, and method for producing high purity metal
CN1526497A (en) Apparatus and method for producing high and medium melting point metal and its oxide or nitride powder
JP2013212962A (en) Method for producing silicon, silicon wafer and panel for solar cell
JPH0688148A (en) Method and device for manufacturing pure magnesium lump from magnesium fine pieces
JPH09176751A (en) Method and for treating material mixture possessing at least two phases having different boiling temperatures apparatus therefor
JP5222713B2 (en) Method for purifying silicon
JP3796237B2 (en) Mercury removal method
JP2009293065A (en) Indium recovering apparatus
JP2001511701A (en) Solvent evaporator
JP2004183086A (en) Method of producing high purity chromium, and high purity chromium
JP2005305252A (en) Method and equipment for pretreating oil containing aromatic chlorinated organic compound

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 07851993

Country of ref document: EP

Kind code of ref document: A1

WWE Wipo information: entry into national phase

Ref document number: 2671529

Country of ref document: CA

WWE Wipo information: entry into national phase

Ref document number: 2007851993

Country of ref document: EP

NENP Non-entry into the national phase

Ref country code: DE

WWE Wipo information: entry into national phase

Ref document number: 12516593

Country of ref document: US