US3211545A - Process and apparatus for vacuum degassing of metal - Google Patents

Process and apparatus for vacuum degassing of metal Download PDF

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Publication number
US3211545A
US3211545A US273713A US27371363A US3211545A US 3211545 A US3211545 A US 3211545A US 273713 A US273713 A US 273713A US 27371363 A US27371363 A US 27371363A US 3211545 A US3211545 A US 3211545A
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US
United States
Prior art keywords
molten metal
furnace
metal
pouring funnel
tap
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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
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US273713A
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English (en)
Inventor
Sickbert Adolf
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Heppenstall Co
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Heppenstall Co
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Publication date
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    • 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
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/10—Handling in a vacuum
    • 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
    • F27B3/19—Arrangements of devices for discharging
    • 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
    • F27D3/14—Charging or discharging liquid or molten material

Definitions

  • molten metal is transferred from a vessel such as a furnace to a tap degassing chamber maintained at a vacuum. As the metal enters the tap degassing chamber, it breaks into a spray due to the influence of the vacuum thereon, and thereupon the degassing occurs. As practiced heretofore, the molten metal is transferred from the furnace to a small so-called pouring funnel which is a small container positioned atop the tap degassing ladle and in communication therewith, so that molten metal can flow from the pouring funnel into the vacuum degassing chamber.
  • the molten metal in the pouring funnel is exposed to atmospheric pressure and it maintains a seal to secure the vacuum in the tap degassing chamber.
  • the pouring funnels are of small size in order to reduce heat losses.
  • a valve means or so-called stopper rod is provided, and the control is effected by adjusting the position of the stopper rod to control the size of the discharge opening of the pouring funnel.
  • FIG. 1 is a schematic representation of apparatus according to the invention, showing in cross-section a furnace, transfer means, pouring funnel and tap degassing chamber;
  • FIG. 2 is a schematic representation of an arrangement according to the invention of form alternative to that shown in FIG. 1;
  • FIG. 3 shows still another alternative arrangement
  • FIG. 4 shows a fourth alternative arrangement.
  • tap degassing can be performed by maintaining a relatively large body of metal in a container such as a furnace, transferring the molten metal from the furnace or the like to a pouring funnel mounted atop a tap degassing chamber, and allowing the metal to flow from the pouring funnel into the tap degassing chamber for degassing of the metal, and during such operation, controlling the rate of flow of molten metal into the pouring funnel and allowing the molten metal to flow freely from the pouring funnel into the tap degassing chamber.
  • flow of molten metal to the tap degassing chamber is controlled without the use of a stopper rod or other valve means for controlling rate of flow from the pouring funnel into the tap degassing chamber.
  • rate of flow to the pouring funnel is controlled by controlling rate of flow from the furnace.
  • a furnace 1 which can be a stationary Siemens-Martin furnace, contains a large body 4 of molten metal.
  • a plug 3 which can be knocked out or burned out when it is desired to drain metal from the furnace.
  • the outlet opening 2 communicates with a pouring spot 7 and the pouring spot 7 is positioned to transfer molten metal to the pouring funnel 10 mounted atop the tap degassing chamber which, as here shown, is formed by a ladle 8 having a vacuum tight cover 9.
  • Connection 9a to the tap degassing chambet is for drawing a vacuum on the chamber.
  • the ladle is provided with a discharge means 8b and rests on supports 8a.
  • an insert 5 of refractory material Positioned in the furnace outlet opening 2 is an insert 5 of refractory material, this insert has an opening 6 of suitable size so that metal flows from the furnace at a suitable rate for introduction into the tap degassing chamber, and, hence, control of the flow from the pouring funnel 10 to the tap degassing chamber is not required.
  • the arrangement of equipment is generally similar to that shown in FIG. 1, except that a reservoir is interposed between the furnace 1 and the pouring funnel 10.
  • This reservoir 11 is positioned to receive molten metal from the outlet opening 2 of the furnace and is provided with an outlet 12 having an insert 13, the insert being proportioned to provide an opening 14 of a size suitable to limit flow to the value desired for the tap degassing operation.
  • the reservoir 11 is provided with a slide let-01f spout 11a and with suitable bottom fill 11b to provide a desired lower level for the reservoir.
  • FIG. 3 is similar to the embodiment shown in FIG. 2, except that in this embodiment, the reservoir outlet opening 14 is outfitted with a valve means or stopper 15 for controlling the size of the outlet opening 14 and thereby controlling the rate of flow of molten metal from the reservoir 11 to the pouring funnel 10.
  • the position of the stopper 15 relative to the opening 14 can be controlled by any suitable means, such as means as are known for controlling the position of stoppers used in combination with pouring funnels in the tap degassing of metals.
  • a tap spout such as tap spout 7 in FIG. 2, can be positioned to receive molten metal from the discharge opening 14 of reservoir 11 in FIG. 3, and to conduct the metal to a port hole positioned at a convenient location.
  • FIG. 4 Still another means for controlling flow according to the invention is indicated in FIG. 4.
  • a siphon is used for transfer of molten metal from the furnace 1 to the pouring funnel 10,
  • the outlet opening of the furnace is positioned above the upper level for molten metal in the furnace and there is positioned in this opening a refractory insert 16.
  • Extending through the insert 16 is a siphon tube of refractory material.
  • the siphon tube extends to about the bottom of the furnace, while without the furnace 1 the siphon tube extends to a level just below the lower level for molten metal in the furnace.
  • a bracket 18a is provided for supporting the siphon outside the furnace.
  • the siphon is provided with a nozzle means 18 which can be of suitable size to provide the desired rate of flow of metal to the pouring funnel 10 and hence to the tap degassing chamber 8.
  • the siphon is outfitted with a starting line 20 having valve 20a.
  • the starting line 20 communicates with a suitable vacuum pump and upon opening the valve 20a vacuum for initiating the siphoning action can be obtained.
  • the discharge nozzle 18 can be provided with a closure sealing its outlet opening and formed of a material such as plastic or paper which, upon being struck by the molten metal will burn and thus open the siphon for flow therethrough of the molten metal.
  • the procedure and means provided by the invention are particularly applicable to non-tilting furnaces such as stationary Siemens-Martin furnaces.
  • the method of tap degassing metal available initially as a molten body thereof in a furnace which comprises:
  • Apparatus for tap degassing of metal which comprises:
  • a reservoir interposed in said conduit means for receiving molten metal from said furnace, said reservoir having an outlet opening for discharge of molten metal to the pouring funnel, the reservoir outlet opening having an opening size suitable to control the rate of flow of molten metal to the pouring funnel.
  • valve means for controlling the opening size of the reservoir discharge outlet, whereby flow to the pouring funnel can be regulated.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
US273713A 1962-04-19 1963-04-17 Process and apparatus for vacuum degassing of metal Expired - Lifetime US3211545A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEB0066914 1962-04-19

Publications (1)

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US3211545A true US3211545A (en) 1965-10-12

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US273713A Expired - Lifetime US3211545A (en) 1962-04-19 1963-04-17 Process and apparatus for vacuum degassing of metal

Country Status (5)

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US (1) US3211545A (cs)
AT (1) AT243297B (cs)
BE (1) BE631141A (cs)
CH (1) CH420236A (cs)
GB (1) GB1042962A (cs)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4049248A (en) * 1971-07-16 1977-09-20 A/S Ardal Og Sunndal Verk Dynamic vacuum treatment
WO2010063875A1 (en) * 2008-12-05 2010-06-10 Boildec Oy A method and device for emptying the floor of a black liquor recovery boiler
US8152965B2 (en) 2006-10-18 2012-04-10 Boildec Oy Method and device for emptying the floor of a soda recovery boiler

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59189282A (ja) * 1983-03-31 1984-10-26 新日鐵化学株式会社 高温溶融物の定量排出方法
DE8504755U1 (de) * 1985-02-20 1986-08-28 Kortec AG, Zug Feuerfestausgekleidetes Abflußrohr zum Überleiten einer vorgegebenen Menge flüssigen Metalls aus einem ein Metallschmelzbad enthaltenden Gefäß in einen Aufnahmebehälter

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1554368A (en) * 1923-03-01 1925-09-22 Adolph A Rackoff Process and apparatus for making steel
GB833925A (en) * 1956-12-12 1960-05-04 Bochumer Ver Fur Gussstahlfabr A process and apparatus for the vacuum treatment of steel or steel alloy
US3013316A (en) * 1958-12-31 1961-12-19 United States Steel Corp Method and apparatus for vacuum casting
CA637040A (en) * 1962-02-20 A. Orehoski Michael Method and apparatus for vacuum casting
US3050798A (en) * 1960-06-13 1962-08-28 Strategic Materials Corp Process for continuous casting and vacuum degasification

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA637040A (en) * 1962-02-20 A. Orehoski Michael Method and apparatus for vacuum casting
US1554368A (en) * 1923-03-01 1925-09-22 Adolph A Rackoff Process and apparatus for making steel
GB833925A (en) * 1956-12-12 1960-05-04 Bochumer Ver Fur Gussstahlfabr A process and apparatus for the vacuum treatment of steel or steel alloy
US3013316A (en) * 1958-12-31 1961-12-19 United States Steel Corp Method and apparatus for vacuum casting
US3050798A (en) * 1960-06-13 1962-08-28 Strategic Materials Corp Process for continuous casting and vacuum degasification

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4049248A (en) * 1971-07-16 1977-09-20 A/S Ardal Og Sunndal Verk Dynamic vacuum treatment
US8152965B2 (en) 2006-10-18 2012-04-10 Boildec Oy Method and device for emptying the floor of a soda recovery boiler
WO2010063875A1 (en) * 2008-12-05 2010-06-10 Boildec Oy A method and device for emptying the floor of a black liquor recovery boiler
US20110232688A1 (en) * 2008-12-05 2011-09-29 Boildec Oy method and device for emptying the floor of a black liquor recovery boiler
US8808461B2 (en) 2008-12-05 2014-08-19 Boildec Oy Method and device for emptying the floor of a black liquor recovery boiler

Also Published As

Publication number Publication date
AT243297B (de) 1965-11-10
GB1042962A (en) 1966-09-21
CH420236A (de) 1966-09-15
BE631141A (cs)

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