EP4019162A1 - Verfahren und system zur bereitstellung von metallschmelze - Google Patents

Verfahren und system zur bereitstellung von metallschmelze Download PDF

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Publication number
EP4019162A1
EP4019162A1 EP20020646.4A EP20020646A EP4019162A1 EP 4019162 A1 EP4019162 A1 EP 4019162A1 EP 20020646 A EP20020646 A EP 20020646A EP 4019162 A1 EP4019162 A1 EP 4019162A1
Authority
EP
European Patent Office
Prior art keywords
molten metal
channel
flow
inert gas
source
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Withdrawn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
EP20020646.4A
Other languages
English (en)
French (fr)
Inventor
Ian Hibbitt
Charlie Howard
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.)
Linde GmbH
Original Assignee
Linde GmbH
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 Linde GmbH filed Critical Linde GmbH
Priority to EP20020646.4A priority Critical patent/EP4019162A1/de
Priority to PCT/EP2021/025472 priority patent/WO2022135735A1/en
Publication of EP4019162A1 publication Critical patent/EP4019162A1/de
Withdrawn legal-status Critical Current

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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
    • B22D41/50—Pouring-nozzles
    • 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
    • B22D41/50—Pouring-nozzles
    • B22D41/58—Pouring-nozzles with gas injecting means
    • 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
    • B22D41/50—Pouring-nozzles
    • B22D41/60—Pouring-nozzles with heating or cooling means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D46/00—Controlling, supervising, not restricted to casting covered by a single main group, e.g. for safety reasons
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/02—Making metallic powder or suspensions thereof using physical processes
    • B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
    • B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
    • B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
    • B22F2009/0848—Melting process before atomisation

Definitions

  • the present invention relates to a method and to a system for providing molten metal, a flow of molten metal being poured from a source of molten metal into a receptacle.
  • molten metal or, more particularly, a molten metal alloy is transferred to a tundish from where it is delivered to an atomizer for atomizing the molten metal alloy by gas or water to generate metallic powder.
  • the transfer of the molten metal alloy to the tundish prior to the atomization process is carried out by pouring the molten metal alloy through the air. This, however, allows the alloy to pick up oxygen from the surrounding atmosphere causing undesirable changes to the alloy chemistry.
  • the resulting changes may produce increased slag formation in the tundish, which may result in blockages of the atomization nozzles in the atomizer which in turn reduces the efficiency of the process and increases the waste of material.
  • molten metal is poured through the air from the furnace into a mold or into a tundish.
  • the metal oxidizes with the air. This causes an undesirable change in the quality of the metal received in the mold or tundish.
  • metal oxide may build up on the lining of the tundish which could result in the tundish nozzle becoming blocked.
  • the present invention provides a method and a system for providing a flow of molten metal into a receptacle according to the independent claims.
  • Advantageous embodiments are the subject-matter of the respective dependent claims and the description as follows.
  • the present invention suggests a method of providing molten metal, wherein a flow of molten metal is poured from a source of molten metal into a receptacle.
  • a channel or duct, or conduit
  • a flow of inert gas is provided inside the channel for inerting the flow of molten metal.
  • the channel or duct or conduit through which the flow of molten metal is guided is circumferentially closed or almost closed as described further below.
  • the channel can have an essentially semicircular form and be made of a refractory material for guiding a flow of molten metal, means for providing the flow of inert gas being provided at the open side of the channel directing the flow of inert gas onto the flow of molten metal.
  • the present invention is described in the following on the basis of a circumferentially almost closed channel having openings or apertures designed for supplying flows of inert gas into the interior of the channel and/or for supplying means for pre-heating the interior of the channel as will be described below.
  • the invention reduces the oxidation of molten metal during the pouring process and thus overcomes the disadvantages of the prior art.
  • the step of providing a flow of inert gas comprises delivering an inert gas through nozzles arranged along the length of the channel, particularly along an upper side of the channel. While a single nozzle arranged at the inlet side of the channel may be sufficient, it is preferred to arrange a plurality of nozzles along the length of the channel. As the flow of molten metal covers the lower side of the channel, it is preferred to arrange the nozzles along the upper side of the channel. Preferably, the interior of the channel is rendered inert prior to the pouring step.
  • the method comprises the step of pre-heating the channel prior to pouring the molten metal out of the source of molten metal.
  • the step of pre-heating prevents the onset of solidification and enables a steady flow of molten metal through the channel.
  • the step of pre-heating is preferably performed by using burner flames generated by burners located along the length of the channel. As burner flames reduce the presence of oxygen inside the channel, the step of pre-heating includes the step of rendering inert the interior of the channel before starting pouring molten metal into the channel.
  • burner nozzles of the burners used for pre-heating can be used for delivering inert gas inside the channel.
  • the effort can be reduced and the efficiency of the system can be improved.
  • argon, nitrogen or a combination of these gases can be used as the inert gas.
  • the method automatically switches from the step of pre-heating to the step of inerting by detecting the presence of molten metal in the channel.
  • the channel or the outlet of the source of molten metal may comprise a sensor for detecting the flow of molten metal being poured out of the outlet of the source of molten metal.
  • the method can switch from pre-heating to inerting by starting to provide a flow of inert gas inside the channel. This switching step is preferably done by means of a control unit connected to the sensor. If burners are used for both pre-heating and delivering the flow of inert gas, the control unit is preferably also connected to the burners or to the conduits supplying the burners with the gases required for pre-heating and delivering inert gas.
  • the present invention is particularly useful in furnaces for melting metal, particularly a metal alloy, where molten metal/metal alloy is poured in a tundish which latter is particularly connected to an atomizer for producing metallic powder.
  • the invention further relates to a system for providing molten metal, comprising a source of molten metal configured to pour a flow of molten metal out of an outlet of the source of molten metal, further comprising a receptacle having an inlet for receiving said flow of molten metal, and a channel (or a duct, or a conduit) for guiding said flow from the outlet of the source of molten metal to the inlet of the receptacle, the channel being configured to provide a flow of inert gas into the channel for inerting the flow of molten metal.
  • the channel comprises (one or more) nozzles for delivering inert gas arranged along the length of the channel, particularly along an upper side of the channel.
  • the channel comprises (one or more) burners located (at or) along the length of the channel, particularly again along an upper side of the channel.
  • the burners are configured for pre-heating the channel before the step of pouring molten metal inside the channel.
  • the burner nozzles are configured not only to deliver the flows of air/oxygen and fuel for the burning process but also to deliver the flow of inert gas.
  • FIG. 1 schematically shows a furnace 110 as a source of molten metal, the furnace 110 being used for melting a metal, particularly a metal alloy, the furnace having a lid 116 and an outlet 112 for pouring the molten metal out of the furnace 110.
  • a flow 115 of molten metal is poured through the air from the furnace 110 into a mold or into a tundish 120 as depicted in Figure 1 .
  • the bottom of the tundish 120 is connected to an atomizer for atomizing the molten metal alloy by gas or water to generate metallic powder.
  • the flow 115 of molten metal comes into contact with oxygen of the surrounding atmosphere, oxidation of molten metal occurs resulting in undesirable changes to the alloy chemistry.
  • FIG. 2 schematically shows an embodiment of a system 100 according to the present invention. Same reference signs refer to the same components as in Figure 1 . Insofar reference to the comments in connection with Figure 1 is made.
  • a channel 130 in the form of a duct or conduit is provided for guiding the flow 115 of molten metal from the outlet 112 of the furnace 110 to the inlet 122 of the receptacle or tundish 120.
  • the channel 130 is circumferentially closed. This avoids intrusion of oxygen from the surrounding atmosphere.
  • the channel 130 comprises nozzles 132 along the length of the channel 130, the nozzles 132 being arranged on the upper side of the channel 130 to permit an undisturbed flow 115 of molten metal through the channel into the tundish 120.
  • inert gas is introduced into the interior of the channel 130 during the pouring process.
  • Argon is used in this embodiment as inert gas.
  • burners are arranged along the length of the channel 130, the burners having burner nozzles for providing flows of oxygen/air and fuel for producing flames inside the channel 130.
  • the burner flames are used for pre-heating the inside of the channel 130 prior to the pouring step. This prevents the onset of solidification and thus enables a steady flow 115 of molten metal through the channel 130. At the same time, this serves to pre-inert the inside of the channel 130.
  • a sensor 134 is arranged at the inlet of the channel 130 for detecting a flow 115 of molten metal. As soon as a flow 115 of molten metal is detected by the sensor 134, the process of pre-heating is switched to inerting.
  • the control unit 136 receives a signal from the sensor 134 that a flow 115 of molten metal is present.
  • the control unit 136 then controls the burner nozzles to deliver inert gas instead of air/oxygen or fuel into the channel 130.
  • the burner nozzles can be used both for pre-heating and inerting.
  • the system 100 shown in Figure 2 prevents undesirable changes of the alloy chemistry as well as formation of slag and metal oxides in the tundish 120.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacture Of Metal Powder And Suspensions Thereof (AREA)
EP20020646.4A 2020-12-23 2020-12-23 Verfahren und system zur bereitstellung von metallschmelze Withdrawn EP4019162A1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP20020646.4A EP4019162A1 (de) 2020-12-23 2020-12-23 Verfahren und system zur bereitstellung von metallschmelze
PCT/EP2021/025472 WO2022135735A1 (en) 2020-12-23 2021-11-30 Method and system for providing molten metal

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20020646.4A EP4019162A1 (de) 2020-12-23 2020-12-23 Verfahren und system zur bereitstellung von metallschmelze

Publications (1)

Publication Number Publication Date
EP4019162A1 true EP4019162A1 (de) 2022-06-29

Family

ID=74003665

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20020646.4A Withdrawn EP4019162A1 (de) 2020-12-23 2020-12-23 Verfahren und system zur bereitstellung von metallschmelze

Country Status (2)

Country Link
EP (1) EP4019162A1 (de)
WO (1) WO2022135735A1 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU222996U1 (ru) * 2023-09-08 2024-01-25 Алексей Сергеевич Кочин Промежуточный ковш установки непрерывной разливки стали

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB726735A (en) * 1953-05-15 1955-03-23 Henry Alexander Golwynne Metal powder
US5346530A (en) * 1993-04-05 1994-09-13 General Electric Company Method for atomizing liquid metal utilizing liquid flow rate sensor
US20010052661A1 (en) * 2000-06-16 2001-12-20 Kawasaki Steel Corporation Fume dust suppression during pouring of molten metal, and apparatus
EP1356882A1 (de) * 2002-04-04 2003-10-29 Capital Technology GmbH Vorrichtung zur Herstellung von Pulvermetall

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB726735A (en) * 1953-05-15 1955-03-23 Henry Alexander Golwynne Metal powder
US5346530A (en) * 1993-04-05 1994-09-13 General Electric Company Method for atomizing liquid metal utilizing liquid flow rate sensor
US20010052661A1 (en) * 2000-06-16 2001-12-20 Kawasaki Steel Corporation Fume dust suppression during pouring of molten metal, and apparatus
EP1356882A1 (de) * 2002-04-04 2003-10-29 Capital Technology GmbH Vorrichtung zur Herstellung von Pulvermetall

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU222996U1 (ru) * 2023-09-08 2024-01-25 Алексей Сергеевич Кочин Промежуточный ковш установки непрерывной разливки стали

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Publication number Publication date
WO2022135735A1 (en) 2022-06-30

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