EP0900854B1 - Kondensatauffanganordnung für Schmelzbehandlung in Kaltherdofen - Google Patents

Kondensatauffanganordnung für Schmelzbehandlung in Kaltherdofen Download PDF

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Publication number
EP0900854B1
EP0900854B1 EP19980202473 EP98202473A EP0900854B1 EP 0900854 B1 EP0900854 B1 EP 0900854B1 EP 19980202473 EP19980202473 EP 19980202473 EP 98202473 A EP98202473 A EP 98202473A EP 0900854 B1 EP0900854 B1 EP 0900854B1
Authority
EP
European Patent Office
Prior art keywords
hearth
condensate
retention
refining
alloy
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.)
Expired - Lifetime
Application number
EP19980202473
Other languages
English (en)
French (fr)
Other versions
EP0900854A1 (de
Inventor
Stephen Martin Tilmont
William Frane Brinton
Leonard Earl Mcmullen
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.)
Titanium Hearth Technologies Inc
Original Assignee
Titanium Hearth Technologies Inc
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 Titanium Hearth Technologies Inc filed Critical Titanium Hearth Technologies Inc
Publication of EP0900854A1 publication Critical patent/EP0900854A1/de
Application granted granted Critical
Publication of EP0900854B1 publication Critical patent/EP0900854B1/de
Anticipated expiration legal-status Critical
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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
    • C22B9/16—Remelting metals
    • C22B9/22—Remelting metals with heating by wave energy or particle radiation
    • C22B9/228—Remelting metals with heating by wave energy or particle radiation by particle radiation, e.g. electron beams
    • 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
    • C22B34/00—Obtaining refractory metals
    • C22B34/10—Obtaining titanium, zirconium or hafnium
    • C22B34/12—Obtaining titanium or titanium compounds from ores or scrap by metallurgical processing; preparation of titanium compounds from other titanium compounds see C01G23/00 - C01G23/08
    • C22B34/1295—Refining, melting, remelting, working up of titanium
    • 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
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/02—Crowns; Roofs
    • F27D1/025—Roofs supported around their periphery, e.g. arched roofs
    • 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
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/12—Casings; Linings; Walls; Roofs incorporating cooling arrangements

Definitions

  • the present invention relates to a condensate retention arrangement for cold hearth refining and to a method of condensate retention in cold hearth refining.
  • an energy source such as an electron beam gun, directs energy toward an alloy to be refined which is contained in a water cooled hearth.
  • Typical refining arrangements for such alloys are described, for example, in United States Patents Nos. 5,171,357 and 5,222,547.
  • the alloys being refined such as, for example, various titanium alloys, contain elements with higher vapour pressures and/or lower melting points than other elements in the alloy and therefore evaporate preferentially to the other elements.
  • the metals evaporated during the refining process are typically collected on a condensate screen as described, for example in United States Patent No. 3,690,635.
  • the condensate normally has a different composition than the alloy being refined and, to provide the desired alloy composition after refining allowance is usually made in the feed material for the loss of constituents to the condensate.
  • the variability in the composition of the refined alloy often requires a vacuum arc-remelting step resulting from loss of constituents to a condensate in order to meet chemical uniformity requirements. If the condensate variations during the original refining are of sufficient severity, the alloy may not meet the specification even after vacuum arc remelting, which can result in significant yield losses, additional processing costs and late deliveries.
  • WO-A-97/21965 discloses a panel for a high temperature furnace.
  • the panel comprises an outer portion and an inner portion.
  • the outer portion comprises a series of cooling pipes throughout which, in use, cooling fluid flows.
  • the inner portion comprises a layer of fireproof material throughout which a number of bar-like means are dispersed. The bar-like means are in close contact with the cooling pipes to assist removal of heat from the fireproof material.
  • FR-A-2 254 247 discloses a high temperature electrical furnace comprising two hemispheres. Each hemisphere further comprises tubes throughout which, in use, cooling fluid can be circulated.
  • One aim of the present invention is to provide a condensate retention arrangement for cold hearth refining by which metal alloy constituents vaporised during refining can be effectively retained to inhibit contamination of the refined alloy.
  • a condensate retention arrangement for cold hearth refining comprising: a member disposed above a refining hearth having coolant passages and having a surface facing the hearth to receive vaporized alloy constituents from the hearth and wherein the surface facing the hearth contains a plurality of dovetail retention grooves to, in use, facilitate retention of condensate.
  • a method for condensate retention in cold hearth refining comprising disposing a member above a hearth in which an alloy is heated by energy beam impingement and constituents of the alloy are vaporized, and cooling the member by circulation of a coolant to cause the vaporized alloy constituents to condense and solidify on a surface of the member facing the hearth and providing dovetail retention grooves in the surface of the member facing the hearth to facilitate retention of condensate.
  • a cold hearth refining furnace 10 includes a conventional cold hearth 12 which contains metal alloys to be refined and which is cooled in the usual manner by internal circulation of a coolant such as water. Energy is applied to the metal alloy to be refined from one or more energy sources such as electron beam guns 14 by which beams 15 of energy can be selectively directed toward the alloy material in the hearth. After refining the molten alloy is conveyed through a trough 16 from the hearth to a conventional water-cooled vertical mould 18 in which it is solidified to form an ingot or electrode for subsequent remelting 20.
  • a coolant such as water.
  • the lid 26 is provided with internal passage 28 such as conduits or jackets through which a coolant such as water is circulated and the dome-shaped cover 26 and the side walls of the enclosures 24 are provided with the dovetail retention grooves (similar to those shown in detail in Fig. 2).
  • the condensate coating 25 has a different morphology than that of condensates deposited on surfaces which have not been cooled, the difference in morphology being somewhat analogous to that between snow (corresponding to condensate on conventional condensate screens and uncooled surfaces) and ice (corresponding to the condensate 25 on the water-cooled surfaces 22).
  • the condensate coating 25 is less frangible and less likely to break away and fall into the liquid metal in the hearth.
  • the lid 26 for the furnace has a domed shape providing a concave interior surface facing the hearth. This produces a 'hoop' effect, which makes the condensate coating self-supporting and decreases any tendency of portions of the condensate on that surface to separate and fall into the hearth.
  • the relatively constant temperature of the surfaces 22 maintained by the coolant circulated through the conduits 28 eliminates thermal cycling of the surfaces, further reducing the likelihood that any of the condensate will separate from those surfaces.
  • a dome shaped insert 32 mounted beneath the dome shaped cover 26 has interior surfaces 34 formed with dovetail-shaped grooves 36 to enhance retention of a layer of condensate 37 on the surfaces 34.
  • Water cooling passages 38 are provided in the insert in the same manner as in the lid 26 of Fig. 1.
  • the insert 32 is preferably positioned between the lid 26 and the hearth 12 and has openings 40 for passage of energy beams 15 from the energy sources 14 to the hearth.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Metallurgy (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Environmental & Geological Engineering (AREA)
  • Geology (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)

Claims (8)

  1. Eine Kondensatzurückhaltungsanordnung für Kaltherdveredelung umfassend:
    Ein Teil (26;32), das oberhalb eines Veredelungsherdes (12) angeordnet ist, das Kühlpassagen (28;38) hat, und eine Oberfläche hat, die dem Herd zugewandt ist, um verdampfte Legierungsbestandteile von dem Herd aufzunehmen, und worin die Oberfläche (22;34), die dem Herd zugewandt ist, eine Vielzahl von Schwalbenschwanz-Zurückhaltungsgravuren (36) besitzt, um bei Verwendung, Zurückhaltung von Kondensat zu ermöglichen.
  2. Eine Kondensatzurückhaltungsanordnung nach Anspruch 1, worin das Teil (26;32) eine Kuppelstruktur hat und die Oberfläche (22;34), die dem Herd zugewandt ist, eine konkave Krümmung gegen den Herd besitzt.
  3. Eine Kondensatzurückhaltungsanordnung nach Anspruch 1 oder 2, worin das Teil einen Deckel (26) zur Umschließung, die den Herd beinhaltet, umfaßt.
  4. Eine Kondensatzurückhaltungsanordnung nach Anspruch 1 oder 2, die eine Umschließung, die den Herd beinhaltet, einschließt und worin das Teil (32), welches Kühlpassagen (38) hat, innerhalb des Gehäuses zwischen Herd und dem Oberteil der Umschließung zwischengeschaltet ist.
  5. Ein Verfahren für Kondensatzurückhaltung in Kaltherdveredelung, welches das Anbringen eines Teils (26; 32) oberhalb eines Herdes (12) umfaßt, in welchem durch das Auftreffen eines Energiestrahls eine Legierung erhitzt wird und Bestandteile der Legierung verdampft werden, und Kühlen des Teils (26; 32) durch Zirkulation eines Kühlmittels, um das Kondensieren der verdampften Legierungsbestandteile und ein Erstarren an der Oberfläche (22; 34) des Teiles (26; 32), das dem Herd (12) zugewandt ist, zu verursachen, und Bereitstellen von Schwalbenschwanz-Zurückhaltungsgravuren (36) in der Oberfläche (22; 34) des Teils (26; 32), das dem Herd (12) zugewandt ist, um Zurückhaltung von Kondensat zu ermöglichen.
  6. Ein Verfahren nach Anspruch 5, worin besagtes Teil (26; 32) eine konkave Oberfläche hat
  7. Ein Verfahren nach Anspruch 5 oder 6, welches das Anbringen des Teils als ein Deckel (26) einer Umschließung, die den Herd beinhaltet, einschließt
  8. Ein Verfahren nach Anspruch 5 oder 6, welches das Anbringen des Teils (32) zwischen dem Herd und dem Oberteil der Umschließung, welches den Herd beinhaltet, einschließt
EP19980202473 1997-09-04 1998-07-23 Kondensatauffanganordnung für Schmelzbehandlung in Kaltherdofen Expired - Lifetime EP0900854B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US92320197A 1997-09-04 1997-09-04
US923201 2001-08-06

Publications (2)

Publication Number Publication Date
EP0900854A1 EP0900854A1 (de) 1999-03-10
EP0900854B1 true EP0900854B1 (de) 2001-05-30

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP19980202473 Expired - Lifetime EP0900854B1 (de) 1997-09-04 1998-07-23 Kondensatauffanganordnung für Schmelzbehandlung in Kaltherdofen

Country Status (3)

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EP (1) EP0900854B1 (de)
JP (1) JP3076306B2 (de)
DE (1) DE69800856T2 (de)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE602006016070D1 (de) * 2005-01-25 2010-09-23 Toho Titanium Co Ltd Vorrichtung zum schmelzen von metall mittels elektronenstrahlen und verfahren zur herstellung hochschmelzender metallgussblöcke mit dieser vorrichtung
JP4443430B2 (ja) 2005-01-25 2010-03-31 東邦チタニウム株式会社 電子ビーム溶解装置
JP5066357B2 (ja) * 2006-10-25 2012-11-07 東邦チタニウム株式会社 金属溶製用溶解装置およびこれを用いた金属の溶製方法
JP5046385B2 (ja) * 2007-09-25 2012-10-10 東邦チタニウム株式会社 金属の電子ビーム溶解炉および同炉を用いた金属の溶解方法
AT509787B1 (de) * 2010-04-21 2012-09-15 Inteco Special Melting Technologies Gmbh Wassergekühlter deckel für ein feuerfest zugestelltes behandlungsgefäss für metallschmelzen
CN113249586B (zh) * 2021-03-22 2023-02-28 洛阳双瑞精铸钛业有限公司 一种用于eb炉熔炼钛合金的双层式冷凝罩
CN113249587B (zh) * 2021-03-22 2022-10-18 洛阳双瑞精铸钛业有限公司 一种用于eb炉熔炼钛合金的组合式冷凝罩

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3690635A (en) * 1969-05-16 1972-09-12 Air Reduction Condensate collection means
FR2254247A5 (en) * 1973-12-05 1975-07-04 Desmarquest & Cec Spherical electrically heated laboratory furnace - for operation at high temps. under vacuum and under controlled atmospheres
DE3147337C2 (de) * 1981-11-28 1985-03-14 SIDEPAL S.A. Société Industrielle de Participations Luxembourgeoise, Luxemburg/Luxembourg Wassergekühlte Haube für metallurgische Gefäße, insbesondere Gießpfannen
SE9504444D0 (sv) * 1995-12-12 1995-12-12 Essge Systemteknik Ab Panel

Also Published As

Publication number Publication date
DE69800856T2 (de) 2002-09-12
DE69800856D1 (de) 2001-07-05
JPH11132664A (ja) 1999-05-21
JP3076306B2 (ja) 2000-08-14
EP0900854A1 (de) 1999-03-10

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