US3563299A - Process for the washing and purifying of molten metals - Google Patents

Process for the washing and purifying of molten metals Download PDF

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US3563299A
US3563299A US679684A US3563299DA US3563299A US 3563299 A US3563299 A US 3563299A US 679684 A US679684 A US 679684A US 3563299D A US3563299D A US 3563299DA US 3563299 A US3563299 A US 3563299A
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molten metal
gas
casting
ladle
purifying
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US679684A
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Manfred Schrage
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Messer Griesheim GmbH
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Messer Griesheim GmbH
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    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/10—Supplying or treating molten metal
    • B22D11/106—Shielding the molten jet
    • 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
    • C22B9/055—Refining by treating with gases, e.g. gas flushing also refining by means of a material generating gas in situ while the metal is circulating, e.g. combined with filtration

Definitions

  • a process for washing and purifying molten metals in continuous casting operations includes injecting a flash gas on the molten surface of the continuously moving workpiece in such a manner that the drawn off gases prevent the admission ofair.
  • the invention relates to a process for the washing and purifying of molten metals with respect to continuous casting processes by the injection of gases or gas mixtures.
  • the object of the invention is to eliminate the above disadvantages and to provide a process which combines an effective washing of the liquid metal with an effective casting protection.
  • the flash gas is blown on the molten surface of the continuously moving work piece in such a manner that the drawing off gases effect a casting protection against air admission.
  • a lance may be suitably used for the injection ofthe flash gas.
  • the desired exchange of material takes place at the contact surfaces between gas and melt.
  • the gas rising from the melt surface simultaneously protects the melt surface and casting current.
  • a considerable advantage of this process lies particularly in that the melt can be very effectively decontaminated by the continuously renewing surfaces which form in the castiron mold.
  • An arrangement for the carrying out the inventive process 7 in an advantageous manner includes a lance for the injection of the flash gas between the distribution groove of or casting ladle for the molten substance and the cast-iron mold. Between the distribution groove or ladle and the cast-iron mold, a box or bellows like protective device can also be arranged for obstructing or baffling the gases drawn off through an outlet.
  • the protective device can be placed under more or less intensely reduced pressure, to assure that the gases rising from the melt surface are drawn off. In this simple and advantageous manner the decontaminating reaction is simultaneously intensified by the combination of flash gas process and reduced pressure.
  • the inert or reactive flash gas can be utilized as a carrier for gaseous, liquid or solid additives.
  • FIG. I shows a distribution lance
  • FIG. 2 shows an arrangement protective device
  • the space between distribution groove I and cast-iron mold 2 can, according to FIG. 2, be further surrounded by a box or enhance the casting protection.
  • reduced pressure can be provided at the discharge opening 7 of the casting protection device, so that the drawn off gases are speedily drawn off and so that the decontamination reaction is accelerated by the combination of the reduced pressure and blowing.
  • flash gas for example, can be utilized as a carrier for certain solid, liquid or gaseous additives.
  • a process for flushing, purifying and degassing molten metal with a gas stream in a continuous casting installation including a casting ladle for the molten metal and there being beneath said casting ladle a cast-iron mold for continuously forming a workpiece, comprising directing the gas stream into the surface of the molten metal in said mold below said ladle, penetrating the gas stream into the molten metal a depth for flushing, purifying and degassing the same while the casting operation is taking place, drawing off the gas from the molten metal while the casting operation is taking place, creating a shield with the drawn-off gas to prevent the admission of air to the surface of the molten metal, the gas being directed by a lance between the ladle for the molten substance and the castiron mold, baffling the drawn off gas by means of a protective device disposed between the ladle and cast-iron mold and said device having a gas outlet therein, and maintaining said device under reduced pressure.
  • a process for flushing, purifying and degassing molten metal with a gas stream in a continuous casting installation including a casting ladle for the molten metal and there being beneath said casting ladle a cast-iron mold for continuously forming a workpiece, comprising directing the gas stream into the surface of the molten metal in said mold belowsaid ladle. penetrating the gas stream into the molten metal a depth for flushing, purifying and degassing the same while the casting operation is taking place, applying mechanical means for drawing off the gas from the molten metal while the casting operation is taking place, and creating a. shield with the drawnoff gas to prevent the admission of air to the surface of the molten metal.
  • a process for flushing, purifying and degassing molten metal with a gas stream in a continuous casting installation including a casting ladle for the molten metal and there being beneath saidcasting ladle a cast-iron mold for continuously forming a workpiece, comprising directing the gas stream into the surface of the molten metal in said mold below said ladle, penetrating the gas stream into the molten metal a depth for flushing, purifying and degassing the same while the casting operation is taking place, drawing off the gas from the molten metal while the casting operating is taking place, creating a shield with the drawn-off gas to prevent the admission of air to the surface of the molten metal, providing a bellows formation between the ladle and mold with the drawn-off flowing out of the bellows formation, and utilizing the bellows formation to baffle the drawn-off gas flowing therefrom.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Continuous Casting (AREA)

Abstract

A process for washing and purifying molten metals in continuous casting operations includes injecting a flash gas on the molten surface of the continuously moving workpiece in such a manner that the drawn off gases prevent the admission of air.

Description

United States Patent Inventor Manfred Schrage Dudenhofen near Offenbach, Germany Appl. No. 679,684 Filed Nov. 1, 1967 Patented Feb. 16, 1971 Assignee Messer Griesheim, GmbH Frankfurt am Main, Germany a corporation of Germany Priority Nov. 12, 1966 Germany M 71642 PROCESS FOR THE WASHING AND PURIFYING OF MOLTEN METALS 6 Claims, 2 Drawing Figs.
U.S. C1 .l 164/82, 164/55, 164/66 Int. Cl 822d 11/00 Field of Search 1 64/ 66,
[56] References Cited UNITED STATES PATENTS 3,395,750 10/1968 Keene 164/259 3,300,824 III 967 Ross 164/66 2,889,596 6/1959 Savage et al 164/283 3,224,051 12/1965 Brown, Jr. et all 164/66 963,973 7/1910 Wright. 3,411,566 ll/l968 Astrov etal. l64/55X 3,392,009 7/1968 Holmes et al. 164/66X FOREIGN PATENTS 1,031,317 6/1966 Great Britain.
Primary Examiner-Charles W. Lanham Assistant Examiizer-V. K. Rising Attorney-Connolly & Hutz ABSTRACT: A process for washing and purifying molten metals in continuous casting operations includes injecting a flash gas on the molten surface of the continuously moving workpiece in such a manner that the drawn off gases prevent the admission ofair.
PATENTEU FEB 1 s |97| BACKGROUND OF THE INVENTION The invention relates to a process for the washing and purifying of molten metals with respect to continuous casting processes by the injection of gases or gas mixtures.
It is known to treat molten metal by injecting gases, for instance by injecting oxygen in refining or by injecting argon on melts located in the casting ladle fo'r decontamination purposes. Furthermore, it is customary during the pouring ihto the cast iron mold in continuous casting installations to piotect the melt surface and the casting current against air admission by means of an argon screen or mist.
The utilization of both processes has the disadvantage that they must be undertaken separately, in two steps, i.e. in the casting ladle and in the continuous casting mold, if the decontamination effect is not to be lost during pouring.
SUMMARY or INVENTION The object of the invention is to eliminate the above disadvantages and to provide a process which combines an effective washing of the liquid metal with an effective casting protection.
Inaccordance with this invention the flash gas is blown on the molten surface of the continuously moving work piece in such a manner that the drawing off gases effect a casting protection against air admission. A lance may be suitably used for the injection ofthe flash gas.
The desired exchange of material takes place at the contact surfaces between gas and melt. The gas rising from the melt surface simultaneously protects the melt surface and casting current. A considerable advantage of this process lies particularly in that the melt can be very effectively decontaminated by the continuously renewing surfaces which form in the castiron mold.
An arrangement for the carrying out the inventive process 7 in an advantageous manner, includes a lance for the injection of the flash gas between the distribution groove of or casting ladle for the molten substance and the cast-iron mold. Between the distribution groove or ladle and the cast-iron mold, a box or bellows like protective device can also be arranged for obstructing or baffling the gases drawn off through an outlet. The protective device can be placed under more or less intensely reduced pressure, to assure that the gases rising from the melt surface are drawn off. In this simple and advantageous manner the decontaminating reaction is simultaneously intensified by the combination of flash gas process and reduced pressure. I
In the inventive process the inert or reactive flash gas can be utilized as a carrier for gaseous, liquid or solid additives.
THE DRAWINGS FIG. I shows a distribution lance; and
FIG. 2 shows an arrangement protective device.
DETAILED DESCRIPTION grove'with cast-iron mold and according to FIG. 1 with a melt and gas takes place in the contact zone 5. The rising gases protect both the melt surface as well as the casting current and prevent the admission of air by thereby acting as a shield.
The space between distribution groove I and cast-iron mold 2 can, according to FIG. 2, be further surrounded by a box or enhance the casting protection.
Furthermore, reduced pressure can be provided at the discharge opening 7 of the casting protection device, so that the drawn off gases are speedily drawn off and so that the decontamination reaction is accelerated by the combination of the reduced pressure and blowing.
The invention is, ofcourse, in no way limited to the embodiments described above and illustrated in the drawing, since various modifications are possible without deviating from the scope of the invention. Thus, flash gas, for example, can be utilized as a carrier for certain solid, liquid or gaseous additives.
Iclaim:
I. In a process for flushing, purifying and degassing molten metal with a gas stream in a continuous casting installation including a casting ladle for the molten metal and there being beneath said casting ladle a cast-iron mold for continuously forming a workpiece, comprising directing the gas stream into the surface of the molten metal in said mold below said ladle, penetrating the gas stream into the molten metal a depth for flushing, purifying and degassing the same while the casting operation is taking place, drawing off the gas from the molten metal while the casting operation is taking place, creating a shield with the drawn-off gas to prevent the admission of air to the surface of the molten metal, the gas being directed by a lance between the ladle for the molten substance and the castiron mold, baffling the drawn off gas by means of a protective device disposed between the ladle and cast-iron mold and said device having a gas outlet therein, and maintaining said device under reduced pressure.
2. In a process as set forth in claim I wherein the gas is used as an additive carrier.
3. A process for flushing, purifying and degassing molten metal with a gas stream in a continuous casting installation including a casting ladle for the molten metal and there being beneath said casting ladle a cast-iron mold for continuously forming a workpiece, comprising directing the gas stream into the surface of the molten metal in said mold belowsaid ladle. penetrating the gas stream into the molten metal a depth for flushing, purifying and degassing the same while the casting operation is taking place, applying mechanical means for drawing off the gas from the molten metal while the casting operation is taking place, and creating a. shield with the drawnoff gas to prevent the admission of air to the surface of the molten metal.
4. In a process as set forth in claim 3 including baffling the drawn off gas by means of a protective device disposed between the ladle and cast-iron mold and said device having a gas outlet therein.
5. A process for flushing, purifying and degassing molten metal with a gas stream in a continuous casting installation including a casting ladle for the molten metal and there being beneath saidcasting ladle a cast-iron mold for continuously forming a workpiece, comprising directing the gas stream into the surface of the molten metal in said mold below said ladle, penetrating the gas stream into the molten metal a depth for flushing, purifying and degassing the same while the casting operation is taking place, drawing off the gas from the molten metal while the casting operating is taking place, creating a shield with the drawn-off gas to prevent the admission of air to the surface of the molten metal, providing a bellows formation between the ladle and mold with the drawn-off flowing out of the bellows formation, and utilizing the bellows formation to baffle the drawn-off gas flowing therefrom.
6. In the process as set forth in claim 5 including applying mechanical means to the bellows formation for drawing off the gas from the molten metal.

Claims (5)

  1. 2. In a process as set forth in claim 1 wherein the gas is used as an additive carrier.
  2. 3. A process for flushing, purifying and degassing molten metal with a gas stream in a continuous casting installation including a casting ladle for the molten metal and there being beneath said casting ladle a cast-iron mold for continuously forming a workpiece, comprising directing the gas stream into the surface of the molten metal in said mold below said ladle, penetrating the gas stream into the molten metal a depth for flushing, purifying and degassing the same while the casting operation is taking place, applying mechanical means for drawing off the gas from the molten metal while the casting operation is taking place, and creating a shield with the drawn-off gas to prevent the admission of air to the surface of the molten metal.
  3. 4. In a process as set forth in claim 3 including baffling the drawn off gas by means of a protective device disposed between the ladle and cast-iron mold and said device having a gas outlet therein.
  4. 5. A process for flushing, purifying and degassing molten metal with a gas stream in a continuous casting installation including a casting ladle for the molten metal and there being beneath said casting ladle a cast-iron mold for continuously forming a workpiece, comprising directing the gas stream into the surface of the molten metal in said mold below said ladle, penetrating the gas stream into the molten metal a depth for flushing, purifying and degassing the same while the casting operation is taking place, drawing off the gas from the molten metal while the casting operating is taking place, creating a shield with the drawn-off gas to prevent the admission of air to the surface of the molten metAl, providing a bellows formation between the ladle and mold with the drawn-off flowing out of the bellows formation, and utilizing the bellows formation to baffle the drawn-off gas flowing therefrom.
  5. 6. In the process as set forth in claim 5 including applying mechanical means to the bellows formation for drawing off the gas from the molten metal.
US679684A 1966-11-12 1967-11-01 Process for the washing and purifying of molten metals Expired - Lifetime US3563299A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4062397A (en) * 1976-03-16 1977-12-13 Cashdollar Sr Robert E Protection against oxidation of molten metal streams in continuous casting

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI56857C (en) * 1977-06-21 1980-04-10 Outokumpu Oy SAFETY OVER ANORDNING FOR REFINING AVAILABLE WITH POWDER FORMATION FAST MATERIAL OCH / ELLER GAS

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US963973A (en) * 1906-02-23 1910-07-12 American Steel Foundries Process for introducing modifying elements into castings.
US2889596A (en) * 1957-02-26 1959-06-09 British Iron Steel Research Casting of metals
US3224051A (en) * 1962-01-31 1965-12-21 Brown Fintube Co Method of introducing addition agent into a melt
GB1031317A (en) * 1963-10-22 1966-06-02 Wargons Aktiebolaget A method for the production of ingots
US3300824A (en) * 1963-06-06 1967-01-31 Union Carbide Canada Ltd Method of continuous flat metal casting with the forward mold stroke and pinch roll speed synchronized with the speed of the forward speed of molten metal
US3392009A (en) * 1965-10-23 1968-07-09 Union Carbide Corp Method of producing low carbon, non-aging, deep drawing steel
US3395750A (en) * 1965-09-01 1968-08-06 United States Steel Corp Apparatus for displacing scum in continuous casting molds
US3411566A (en) * 1967-02-20 1968-11-19 Astrov Evgeny Ivanovitch Device for supplying powdered material into a mold of a continuous casting machine

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US963973A (en) * 1906-02-23 1910-07-12 American Steel Foundries Process for introducing modifying elements into castings.
US2889596A (en) * 1957-02-26 1959-06-09 British Iron Steel Research Casting of metals
US3224051A (en) * 1962-01-31 1965-12-21 Brown Fintube Co Method of introducing addition agent into a melt
US3300824A (en) * 1963-06-06 1967-01-31 Union Carbide Canada Ltd Method of continuous flat metal casting with the forward mold stroke and pinch roll speed synchronized with the speed of the forward speed of molten metal
GB1031317A (en) * 1963-10-22 1966-06-02 Wargons Aktiebolaget A method for the production of ingots
US3395750A (en) * 1965-09-01 1968-08-06 United States Steel Corp Apparatus for displacing scum in continuous casting molds
US3392009A (en) * 1965-10-23 1968-07-09 Union Carbide Corp Method of producing low carbon, non-aging, deep drawing steel
US3411566A (en) * 1967-02-20 1968-11-19 Astrov Evgeny Ivanovitch Device for supplying powdered material into a mold of a continuous casting machine

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4062397A (en) * 1976-03-16 1977-12-13 Cashdollar Sr Robert E Protection against oxidation of molten metal streams in continuous casting

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GB1212372A (en) 1970-11-18
NL6713748A (en) 1968-05-13
DE1533107A1 (en) 1969-12-18
BE704352A (en) 1968-02-01

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