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EP1432541A1 - Fours concus pour la production d'alliages de magnesium - Google Patents

Fours concus pour la production d'alliages de magnesium

Info

Publication number
EP1432541A1
EP1432541A1 EP02735927A EP02735927A EP1432541A1 EP 1432541 A1 EP1432541 A1 EP 1432541A1 EP 02735927 A EP02735927 A EP 02735927A EP 02735927 A EP02735927 A EP 02735927A EP 1432541 A1 EP1432541 A1 EP 1432541A1
Authority
EP
European Patent Office
Prior art keywords
production
magnesium alloys
electric furnace
lobes
alloys according
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.)
Withdrawn
Application number
EP02735927A
Other languages
German (de)
English (en)
Inventor
Herman Branover
Ephim Golbraikh
Arkady Kapusta
Boris Mikhailovich
Yuri Gelfgat
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
National Diversified Industries (Aust) Ltd
Original Assignee
National Diversified Industries (Aust) Ltd
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 National Diversified Industries (Aust) Ltd filed Critical National Diversified Industries (Aust) Ltd
Publication of EP1432541A1 publication Critical patent/EP1432541A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
    • B22D41/005—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like with heating or cooling means
    • B22D41/01—Heating means
    • 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
    • C22B26/00—Obtaining alkali, alkaline earth metals or magnesium
    • C22B26/20—Obtaining alkaline earth metals or magnesium
    • C22B26/22—Obtaining magnesium
    • 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
    • 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
    • F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
    • F27B7/20—Details, accessories or equipment specially adapted for rotary-drum furnaces
    • F27B7/2083—Arrangements for the melting of metals or the treatment of molten metals
    • 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
    • C21C5/52—Manufacture of steel in electric furnaces
    • C21C5/5241—Manufacture of steel in electric furnaces in an inductively heated furnace
    • 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
    • F27D99/00—Subject matter not provided for in other groups of this subclass
    • F27D99/0001—Heating elements or systems
    • F27D99/0006—Electric heating elements or system
    • F27D2099/0008—Resistor heating
    • 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
    • F27D27/00—Stirring devices for molten material
    • 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
    • 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
    • Y02P10/25—Process efficiency

Definitions

  • the present invention is related to furnaces for the production of magnesium alloys.
  • resistor heaters are introduced into the working volume of the furnace from above and are immersed into the melt at Mg melting (US Patent No.4158743, 1979).
  • these heaters serve as heat sources only and cannot be used for melt mixing.
  • an electric furnace for the production of magnesium alloys comprising a working chamber made in the form of a lined cylinder with a horizontal symmetry axis and two adjacent heads in the shape of truncated cones, cylinders or hemispheres made of refractory material possessing ferromagnetic properties up to a temperature of about 800°C.
  • an electric furnace for the production of magnesium alloys as defined above comprising two resistor heaters made of low-carbon steel in the shape of mn symmetric lobes (wherein m is the number of phases, and n is the number of lobes in a phase) of conical, cylindrical or hemispheric surfaces being arranged and connected according to a star connection diagram in order to excite two rotating magnetic fields within the working chamber.
  • FIG. 1 schematically shows vertical cross section B-B of the first variant of the furnace for the production of magnesium alloys.
  • Fig. 2 schematically shows vertical cross section A-A of the first variant of the furnace for the production of magnesium alloys.
  • Fig. 3 schematically shows vertical cross section C-C of the first variant of the heater for the first variant of the furnace for the production of magnesium alloys -shown in Figs. 1 , 2.
  • Fig. 4 shows the view along the arrow G of the first variant of the heater for the first variant of the furnace for the production of magnesium alloys shown in Figs. 1 , 2.
  • Fig. 5 schematically shows vertical cross section B ⁇ B- t of the first variant of the furnace for the production of magnesium alloys with protective cones 20.
  • Fig. 6 schematically shows vertical cross section A-i-A- t of the first variant of the furnace for the production of magnesium alloys with protective cones 20.
  • Fig. 7 schematically shows vertical cross section B 2 -B 2 of the second variant of the furnace for the production of magnesium alloys.
  • Fig. 8 schematically shows vertical cross section A 2 -A 2 of the second variant of the furnace for the production of magnesium alloys.
  • Fig. 9 shows vertical cross section of the heater of the second variant of the furnace for the production of magnesium alloys shown in Figs. 7, 8.
  • Fig. 10 schematically shows vertical cross section B 3 -B 3 of the third variant of the furnace for the production of magnesium alloys.
  • Fig. 11 schematically shows vertical cross section A 3 -A 3 of the third variant of the furnace for the production of magnesium alloys.
  • Fig. 12 schematically shows vertical cross section B -B of the fourth variant of the furnace for the production of magnesium alloys.
  • Fig. 13 schematically shows vertical cross section A 4 -A 4 of the fourth variant of the furnace for the production of magnesium alloys.
  • Fig. 14 schematically shows vertical cross section B 5 -B 5 of the fifth variant of the furnace for the production of magnesium alloys.
  • Fig. 15 schematically shows vertical cross section A 5 -A 5 of the fifth variant of the furnace for the production of magnesium alloys.
  • Fig. 16 schematically shows an axonometric projection of the heater-inductor for the third variant of the furnace for the production of magnesium alloys.
  • Fig. 17 schematically shows an axonometric projection of the heater-inductor for the fourth variant of the furnace for the production of magnesium alloys.
  • Fig. 18 schematically shows vertica) cross section C-,-C ⁇ of the second variant of the heater for the first variant of the furnace for the production of magnesium alloys.
  • Fig. 19 shows the view along the arrow G-i of the second variant of the heater for the first variant of the furnace for the production of magnesium alloys.
  • Fig. 20 schematically shows vertical cross section C 2 -C 2 of the first variant of the heater for the fifth variant of the furnace for the production of magnesium alloys.
  • Fig. 21 shows the view along the arrow G 2 of the first variant of the heater for the fifth variant of the furnace for the production of magnesium alloys.
  • Fig. 22 schematically shows vertical cross section C 3 -C 3 of the second variant of the heater for the fifth variant of the furnace for the production of magnesium alloys.
  • Fig. 23 shows the view along the arrow G 3 of the second variant of the heater for the fifth variant of the furnace for the production of magnesium alloys.
  • a preferred electric furnace for the production of magnesium alloys comprises a body 1 made of low-carbon steel and consists of three parts connected by flanges 2 that also serve as supporting flanges. In the central part of the body 1 there is a hole for loading charge with a cover 3 and an overflow lip 4 with a cover 5.
  • the internal part of the body 1 is thermally insulated by means of lining 6, 7 and ferroceramics 8 with built-in resistor heaters 9 or 21 , or 24, or 25, or else 26 with the working part 9a or 9c, or 21a, or 24a, or 25a, or 26a, or else 26c made from low-carbon steel sheet and terminals 9b or 9d, or 21 b, or 24b, or25b, or 26b, or else 26d - from copper.
  • Said steel and copper, parts of the mentioned heaters are connected by welding.
  • terminals are connected to secondary windings 10a of step-down transformers 10 fixed on the body 1.
  • the transformers are closed with covers 11.
  • the furnace is equipped with a pump 12 (vacuum or MHD) for melt feed into casting molds.
  • the furnace cylinder leans against a frame 14 by means of flanges 2 and rollers 13.
  • a rotating mechanism comprising a cable 15 with ends fixed on the body 1 , a tension roller 16, a drum 17 and a drive comprising a worm gear reducer 18 and an electric motor 19.
  • the invention provides an electric furnace for the production of magnesium alloys including those with components having greatly different densities, wherein the working chamber (1a) represents a lined cylinder (6) with a horizontal symmetry axis and two truncated cones (8) made of ferroceramics, with heaters (9) which are connected through step-down transformers (10) to a m-phase voltage supply line.
  • the heaters (9) are intended for charge melting and excitation of rotating magnetic fields ensuring intense stirring of the melt.
  • the furnace is equipped with a vacuum or MHD pump (12) for melt transportation to foundry molds and rotating mechanisms for emergency discharge of the melt.
  • heaters can be electrically insulated from the melt by means of thin-wall ceramic inserts with a configuration corresponding to the configuration of the heater.
  • thin-wall ceramic inserts with a configuration corresponding to the configuration of the heater.
  • heating elements are isolated from the melt by thin-wall conical inserts 20 made of high-temperature dielectric resisting attack by molten magnesium.
  • one resistor heater 21 or 25 is used with terminals connected with the secondary winding of the transformer 22.
  • the design of these heaters is shown in Figs. 9, 17.
  • the furnace is also equipped with a chute 23 for emergency discharge of the melt.
  • the furnace operates as follows:
  • the working chamber of the furnace After connecting the heaters 9 or 21 , or 24, or 25, or 26 to the main power supply, the working chamber of the furnace is heated up to the working temperature, and after that the charge is loaded into the furnace.
  • m-phase heaters also play the role of inductors inducing two counter-rotating magnetic fields or one rotating magnetic field (RMF) in the furnace, induction currents are induces in the melt, and their interaction with RMF rotates the melt in the vertical plane.
  • RMF rotating magnetic field

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Metallurgy (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

L'invention concerne un four électrique conçu pour la production d'alliages de magnésium comprenant une chambre de travail (1a) ayant la forme d'un cylindre recouvert, doté d'un axe de symétrie horizontal et de deux têtes adjacentes (8), lesdites têtes ayant une forme sélectionnée dans le groupe constitué de troncs de cônes, de cylindres, et d'hémisphères, réalisés à partir de matériaux réfractaires possédant des propriétés ferromagnétiques jusqu'à une température d'environ 800 °C.
EP02735927A 2001-06-11 2002-05-22 Fours concus pour la production d'alliages de magnesium Withdrawn EP1432541A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
IL14366901 2001-06-11
IL14366901A IL143669A0 (en) 2001-06-11 2001-06-11 Furnaces for the production of magnesium alloys
PCT/IL2002/000400 WO2002100577A1 (fr) 2001-06-11 2002-05-22 Fours concus pour la production d'alliages de magnesium

Publications (1)

Publication Number Publication Date
EP1432541A1 true EP1432541A1 (fr) 2004-06-30

Family

ID=11075487

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02735927A Withdrawn EP1432541A1 (fr) 2001-06-11 2002-05-22 Fours concus pour la production d'alliages de magnesium

Country Status (3)

Country Link
EP (1) EP1432541A1 (fr)
IL (1) IL143669A0 (fr)
WO (1) WO2002100577A1 (fr)

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4158743A (en) * 1976-03-01 1979-06-19 Biuro Projektow Pyrzemyslu Metali Niezelaznych "Bipromet" Electric resistance furnace
US5948138A (en) * 1997-07-31 1999-09-07 International Procurement, Inc. Method and apparatus for stirring of molten metal using electromagnetic field
DE19906939C2 (de) * 1999-02-19 2002-09-19 Honsel Ag Induktionstiegelofen und dessen Verwendung zum Herstellen von Gußteilen aus partikelverstärkten Aluminium- und Magnesiumlegierungen

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO02100577A1 *

Also Published As

Publication number Publication date
WO2002100577A1 (fr) 2002-12-19
IL143669A0 (en) 2002-04-21

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Inventor name: GELFGAT, YURI

Inventor name: MIKHAILOVICH, BORIS

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