US3268326A - Treatment of metal melts - Google Patents

Treatment of metal melts Download PDF

Info

Publication number
US3268326A
US3268326A US323936A US32393663A US3268326A US 3268326 A US3268326 A US 3268326A US 323936 A US323936 A US 323936A US 32393663 A US32393663 A US 32393663A US 3268326 A US3268326 A US 3268326A
Authority
US
United States
Prior art keywords
melt
vessel
metal
receptacle
bath
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
US323936A
Other languages
English (en)
Inventor
Harders Fritz
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.)
Dortmund Hoerder Huettenunion AG
Original Assignee
Dortmund Hoerder Huettenunion AG
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 Dortmund Hoerder Huettenunion AG filed Critical Dortmund Hoerder Huettenunion AG
Application granted granted Critical
Publication of US3268326A publication Critical patent/US3268326A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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
    • C21C1/00—Refining of pig-iron; Cast iron
    • 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
    • C21C1/00—Refining of pig-iron; Cast iron
    • C21C1/02—Dephosphorising or desulfurising
    • 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

Definitions

  • An apparatus consisting of an evacuable vessel with a pipe leading into its bottom can also be used in a conventional manner in order to generate vigorous movements in a metal bathfor example, in the melt in a Siemans-Martin furnace-in order to achieve rapid progress of the reaction between the metal bath and the slag, and rapid dissolution and uniform distribution of treatment substances added to the bath.
  • a metal bath is treated with a treatment medium by a method in which the open end of a pipe leading from the bottom of a vessel is introduced into the Ibath, the pressure in the vessel is adjusted to cause a part of the metal in the bath to ow into the vessel, the medium is introduced into the metal in the vessel to form a key alloy containing the medium and the pressure in the vessel is then raised to return the key alloy to the bath.
  • This method is therefore based upon the fact that, by pressure variations, an adequate portion of the melt to be treated is introduced by the liquid displacement apparatus into the vessel, a homogeneous key alloy is manufactured therefrom, and the key alloy which flows back out of the chamber into the melt to be treated is possessed of such kinetic energy that an optimum mixing of the key alloy and the melt is produced. It is impossible fo-r detectable reactions to occur between the substances and the slag covering the bath, since the pipe section of the liquid displacement apparatus leads through the slag cover directly into the metal to be treated. The combustion losses lare consequently also extraordinarily low.
  • the treatment substances are conveniently introduced into the vessel during the actual inflow of the liquid metal.
  • the method according to the invention is also particularly suited for introducing into the metal bath, in metallurgically appropriate succession, materials which diier in their composition and in the purpose for which they are intended.
  • materials which diier in their composition and in the purpose for which they are intended.
  • No heating of the liquid displacement apparatus is necessary during the deoxidation or alloying treatment. It is however desirable to pre-heat the vessel before using it for example, by means of gas burners.
  • the liquid displacement apparatus As compared with steel degassing installations, the liquid displacement apparatus possesses a small weight and small dimensions. It can therefore be transported conveniently with the existing transport means in steelworks practice-for example, cranes--and be brought for use to the required point at any time.
  • metaltreating substances may also be introduced into the vessel of the liquid displacement apparatus when charged with a part of the metal bath.
  • the desulphuration of a pig-iron bath is successfully accomplished if a suspension of tine-grain lime in pig-iron is manufactured in the vessel and introduced into the pig-iron bath.
  • FIGURE l is a Vertical section of a liquid displacement apparatus which operates under vacuum
  • FIGURE 2 is a section of a liquid displacement apparatus which operates under positive pressure.
  • a refractory-lined ladle l contains an iron melt 2 to be deoxidised. This is covered by slag 3.
  • a refractoryclad pipe 4 which leads into the bottom of a substantially cylindrical refractory-lined vessel 5.
  • a charging device 7 Above the top 6 of the Vessel, there is a charging device 7 which is attached in a vacuum-tight manner and its contents can be introduced into the interior of the vessel 5 after opening a closure 8.
  • the charging device may be subdivided into .a number of compartments to accommodate a number of deoxidation media or like treatment materials or treating agents.
  • a key alloy is now manufactured by plunging the pipe 4 of the cylindrical vessel 5, which conveniently has its ends sealed by a fusible slag repellent, not shown, into the bath 2 and a vacuum of approximately 1/2 atm., is then generated in the vessel 5 by means of a pump installation, not shown, via a conduit 9.
  • a small part 10 of the metal bath then flows into the vessel 5.
  • some deoxidation medium is introduced from the charging device 7 into the interior of the vessel. Normal pressure is then established in the vessel 5 via the cond-uit 9, the key alloy being thus returned into the ladle 1 and completely mixed with the iron bath. This process may be repeated a plurality of times.
  • the difference in height between the bath level of the iron bath 2 and of a part 10 in the Vessel 5 .amounts to 0.85 metre. If the pipe section 4, having an inside diameter -of 0.15 metre, is plunged into the iron bath sufciently for the top edge of the base of the vessel to be located 0.25 metre above the top level of the iron bath, then the part 10 in the Vessel 5 if this has an internal height of 1 metre and an inside diameter of 0.6 metre occupies a vcharge height of 0.6 metre and possesses a weight of approximately 1.2 tons.
  • the relatively low vacuum of 0.4 atm. prevents splashing or rothing of the melt When introduced into the vessel 5, which owing to its small weight can be operated and transported suspended Ifrom a crane.
  • the liquid displacement apparatus is conveniently 'actuated four times, and 25 kg. of aluminium is added each time to the part of the melt present in the vessel 5.
  • the vessel 5 With the liquid displacement apparatus shown in FIG- URE 2, which operates at a positive pressure, the vessel 5 is equipped with a short pipe 4. The vessel is plunged sufficiently deeply into the metal bath 2 for the part 10 of the bath which is requisite for manufacturing the key alloy to dow into the vessel, with addition of the deoxid-ationy substances in the charging device 7. By the introduction of a gas at a positive pressure of approximately 1A. at-m. through the conduit 11, the key alloy is returned into the metal bath and is mixed with it. Normal pressure is then established in the interior of the vessel 5 via the conduit 12, and :a key alloy is again produced. This cycle is repeated a sucient number of Itimes until all the deoxidation substances have been added to the iron bath. At the end of the treatment, normal pressure is adjusted in the interior of the vessel 5, and the liquid displacement Iapparatus is raised out of the metal bath,
  • Method of treating a metal melt with treating agents -for purifying and alloying with the metal of the melt which comprises conveying a portable receptacle to a position a'bove a rnelt, lowering an open end of the receptacle into the melt, simultaneously discharging from the receptacle part of the air therein and replacing it with a portion of the melt introduced through the open end of the receptacle, feeding a quantity of treating agent to the portion of the melt in the receptacle so that the treating agent forms an alloy with the metal melt portion, and pressurizing the receptacle to discharge the alloy formed therein into the surrounding melt.
  • Method of treating a metal melt with treating agents for purifying and alloying with the metal of the melt which comprises conveying a portable receptacle to a position above a melt, lowering an open end of the receptacle into the melt to a specific level so that a portion of the melt entering the receptacle through the open end thereof displaces part of the air in the receptacle and discharges it through an opening -at the upper end of the receptacle, feeding a quantity of treating agent to the portion of the lmelt in the receptacle so that the treating agent forms an alloy with the metal melt portion, and pressurizing the receptacle to discharge the alloy formed therein into the surrounding melt.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Treatment Of Steel In Its Molten State (AREA)
  • Manufacture And Refinement Of Metals (AREA)
US323936A 1962-11-29 1963-11-15 Treatment of metal melts Expired - Lifetime US3268326A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DED0040384 1962-11-29

Publications (1)

Publication Number Publication Date
US3268326A true US3268326A (en) 1966-08-23

Family

ID=7045361

Family Applications (1)

Application Number Title Priority Date Filing Date
US323936A Expired - Lifetime US3268326A (en) 1962-11-29 1963-11-15 Treatment of metal melts

Country Status (4)

Country Link
US (1) US3268326A (enrdf_load_stackoverflow)
BE (1) BE639650A (enrdf_load_stackoverflow)
LU (1) LU44592A1 (enrdf_load_stackoverflow)
NL (2) NL144333B (enrdf_load_stackoverflow)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3885957A (en) * 1972-03-01 1975-05-27 Thyssen Niederrhein Ag Method for the desulfurization of a steel melt
US3971655A (en) * 1974-08-21 1976-07-27 Nippon Steel Corporation Method for treatment of molten steel in a ladle
US4104057A (en) * 1972-06-10 1978-08-01 Hermann Maas Method for making low carbon high chromium alloyed steels
USRE31676E (en) * 1982-09-29 1984-09-18 Thyssen Aktiengesellschaft vorm August Thyssen-Hutte AG Method and apparatus for dispensing a fluidizable solid from a pressure vessel
US4689199A (en) * 1984-09-27 1987-08-25 Aluminum Company Of America Process for adding material to molten media
US4688771A (en) * 1984-09-27 1987-08-25 Aluminum Company Of America Alloying system
US4784832A (en) * 1984-09-27 1988-11-15 Eckert Charles E Introducing materials into molten media
US4792431A (en) * 1984-09-27 1988-12-20 Aluminum Company Of America Production of intermetallic particles
US4793971A (en) * 1985-12-24 1988-12-27 Aluminum Company Of America Grain refining
US5030577A (en) * 1986-02-07 1991-07-09 Aluminum Company Of America In-line sampling/alloying system and method

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0000466A1 (de) * 1977-07-13 1979-02-07 VOEST-ALPINE Aktiengesellschaft Verfahren zum Einbringen von körnigen Stoffen in eine Metallschmelze und Vorrichtung zur Durchführung des Verfahrens

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1277523A (en) * 1916-03-06 1918-09-03 Trygve D Yensen Magnetic iron product and method of making same.
US2895820A (en) * 1956-11-08 1959-07-21 Hoerder Huettenunion Ag Methods of reducing iron ores and carburizing under vacuum
US2959478A (en) * 1956-12-22 1960-11-08 Hoerder Huettenunion Ag Method and apparatus for handling metallic melts
US2967768A (en) * 1958-07-29 1961-01-10 Hoerder Huettenunion Ag Process for desulphurising pig. and cast-iron melts
US3019275A (en) * 1957-11-26 1962-01-30 Heraeus Gmbh W C Apparatus for heating molten metals in a vacuum chamber
US3027150A (en) * 1958-03-10 1962-03-27 Hoerder Huettenunion Ag Apparatus for treating steel melts

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1277523A (en) * 1916-03-06 1918-09-03 Trygve D Yensen Magnetic iron product and method of making same.
US2895820A (en) * 1956-11-08 1959-07-21 Hoerder Huettenunion Ag Methods of reducing iron ores and carburizing under vacuum
US2959478A (en) * 1956-12-22 1960-11-08 Hoerder Huettenunion Ag Method and apparatus for handling metallic melts
US3019275A (en) * 1957-11-26 1962-01-30 Heraeus Gmbh W C Apparatus for heating molten metals in a vacuum chamber
US3027150A (en) * 1958-03-10 1962-03-27 Hoerder Huettenunion Ag Apparatus for treating steel melts
US2967768A (en) * 1958-07-29 1961-01-10 Hoerder Huettenunion Ag Process for desulphurising pig. and cast-iron melts

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3885957A (en) * 1972-03-01 1975-05-27 Thyssen Niederrhein Ag Method for the desulfurization of a steel melt
US4104057A (en) * 1972-06-10 1978-08-01 Hermann Maas Method for making low carbon high chromium alloyed steels
US3971655A (en) * 1974-08-21 1976-07-27 Nippon Steel Corporation Method for treatment of molten steel in a ladle
USRE31676E (en) * 1982-09-29 1984-09-18 Thyssen Aktiengesellschaft vorm August Thyssen-Hutte AG Method and apparatus for dispensing a fluidizable solid from a pressure vessel
US4689199A (en) * 1984-09-27 1987-08-25 Aluminum Company Of America Process for adding material to molten media
US4688771A (en) * 1984-09-27 1987-08-25 Aluminum Company Of America Alloying system
US4784832A (en) * 1984-09-27 1988-11-15 Eckert Charles E Introducing materials into molten media
US4792431A (en) * 1984-09-27 1988-12-20 Aluminum Company Of America Production of intermetallic particles
US4793971A (en) * 1985-12-24 1988-12-27 Aluminum Company Of America Grain refining
US5030577A (en) * 1986-02-07 1991-07-09 Aluminum Company Of America In-line sampling/alloying system and method

Also Published As

Publication number Publication date
NL144333B (nl) 1974-12-16
BE639650A (enrdf_load_stackoverflow)
LU44592A1 (enrdf_load_stackoverflow) 1963-12-09
NL301103A (enrdf_load_stackoverflow)

Similar Documents

Publication Publication Date Title
US3870511A (en) Process for refining molten aluminum
US3743263A (en) Apparatus for refining molten aluminum
US3666449A (en) Method for the introduction of volatile additives into a melt
US3272619A (en) Apparatus and process for adding solids to a liquid
US3268326A (en) Treatment of metal melts
US4298377A (en) Vortex reactor and method for adding solids to molten metal therewith
US3948643A (en) Method for refining steel
US3918692A (en) Apparatus for refining molten metals and molten metal refining process
US3650517A (en) Device for removing gas from molten metals contained in a ladle
US3703279A (en) Reactor
US2929704A (en) Methods of and apparatus for degasifying metals
US3895937A (en) Dynamic vacuum treatment to produce aluminum alloys
US3819365A (en) Process for the treatment of molten metals
US3761242A (en) Method of treating molten metal by gas purging rhtough a porous plug
US2692196A (en) Method and apparatus for treating molten metal
GB1423236A (en) Process and device for the treatment of baths of molten metal
US4647306A (en) Process for the treatment of metal melts with scavenging gas
US3617257A (en) Process for continuously refining metal
US2967768A (en) Process for desulphurising pig. and cast-iron melts
US3664826A (en) Process for accelerating metallurgical reactions
US3236635A (en) Method for degassing molten metal
US3934863A (en) Apparatus for refining molten metal and molten metal refining process
US404414A (en) Method of mixing molten pig metal
FI81383C (fi) Foerfarande foer behandling av smaelt metall och anordning foer utfoerande av foerfarandet.
US3203686A (en) Apparatus for degassing molten metal