WO2011021940A1 - Method and apparatus for adding powder and gas in a melt - Google Patents

Method and apparatus for adding powder and gas in a melt Download PDF

Info

Publication number
WO2011021940A1
WO2011021940A1 PCT/NO2010/000300 NO2010000300W WO2011021940A1 WO 2011021940 A1 WO2011021940 A1 WO 2011021940A1 NO 2010000300 W NO2010000300 W NO 2010000300W WO 2011021940 A1 WO2011021940 A1 WO 2011021940A1
Authority
WO
WIPO (PCT)
Prior art keywords
melt
powder
gas
crucible
injection nozzle
Prior art date
Application number
PCT/NO2010/000300
Other languages
French (fr)
Inventor
Bjørn KJERPESET
Original Assignee
Sør Norge Aluminium As
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 Sør Norge Aluminium As filed Critical Sør Norge Aluminium As
Priority to EP10810233A priority Critical patent/EP2467503A1/en
Publication of WO2011021940A1 publication Critical patent/WO2011021940A1/en

Links

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
    • C22B9/05—Refining by treating with gases, e.g. gas flushing also refining by means of a material generating gas in situ
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/50—Mixing liquids with solids
    • B01F23/57—Mixing high-viscosity liquids with solids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/30—Injector mixers
    • B01F25/31—Injector mixers in conduits or tubes through which the main component flows
    • B01F25/314—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced at the circumference of the conduit
    • B01F25/3141—Injector mixers in conduits or tubes through which the main component flows wherein additional components are introduced at the circumference of the conduit with additional mixing means other than injector mixers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/40—Static mixers
    • B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
    • B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
    • B01F25/433—Mixing tubes wherein the shape of the tube influences the mixing, e.g. mixing tubes with varying cross-section or provided with inwardly extending profiles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/40—Static mixers
    • B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
    • B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
    • B01F25/433—Mixing tubes wherein the shape of the tube influences the mixing, e.g. mixing tubes with varying cross-section or provided with inwardly extending profiles
    • B01F25/4331—Mixers with bended, curved, coiled, wounded mixing tubes or comprising elements for bending the flow
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/40—Static mixers
    • B01F25/42—Static mixers in which the mixing is affected by moving the components jointly in changing directions, e.g. in tubes provided with baffles or obstructions
    • B01F25/43—Mixing tubes, e.g. wherein the material is moved in a radial or partly reversed direction
    • B01F25/433—Mixing tubes wherein the shape of the tube influences the mixing, e.g. mixing tubes with varying cross-section or provided with inwardly extending profiles
    • B01F25/4336—Mixers with a diverging cross-section
    • 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
    • C22B21/00—Obtaining aluminium
    • C22B21/06—Obtaining aluminium refining
    • C22B21/062—Obtaining aluminium refining using salt or fluxing agents
    • 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
    • C22B21/00—Obtaining aluminium
    • C22B21/06—Obtaining aluminium refining
    • C22B21/064—Obtaining aluminium refining using inert or reactive gases
    • 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
    • C22B9/10—General processes of refining or remelting of metals; Apparatus for electroslag or arc remelting of metals with refining or fluxing agents; Use of materials therefor, e.g. slagging or scorifying agents
    • C22B9/103—Methods of introduction of solid or liquid refining or fluxing agents

Definitions

  • the present invention relates to a method for addition of powder and gas to a melt, and also a device for a crucible for temporary storage of a melt as described in the preamble of the respective independent claims.
  • NO20063101 shall be referred to, among others, which relates to a method and a device for supply of powder to a melt.
  • the essential features with this known solution are that the powder is added to a melt, where the powder is mixed with a gas and is added to the melt in a tapping pipe, i.e. before the melt enters the pipe bend and the crucible.
  • the melt flows according to known principles from a dispenser via the tapping pipe to a crucible influenced by ' the underpressure in the
  • crucible as is known, for example, from the tapping vehicle from Hydeq.
  • the method is characterised in that when the melt is sucked into the crucible at a certain speed, a feeder starts the supply of powder to the melt at the same time as a fluidisation gas is supplied to the powder, with the supply taking place when the melt comes into said inlet bend and the powder and gas are injected into the melt in the inlet bend, into the underside of the flowing melt via an injection nozzle.
  • the internal bore of the inlet bend is preferably being shaped so that the powder and the gas, after the stream of melt turns, are forced to float through the melt for a second time.
  • the amount of powder that is added depends on the tapping amount of the melt which is sucked up. During start-up and shut-down of the suction process, it can be supplied only gas to the injection nozzle so that this is not blocked up.
  • the molten metal which is sucked up into the crucible is aluminium melt, and the gas which is supplied is preferably argon gas and the powder which is supplied is preferably a fluoride powder.
  • a device as given in the independent claim 6 for a crucible for temporary storage of a melt, such ' as molten metal, with the crucible being equipped with a lid with an inlet bend which comprises an internal arched bore, which, via a suction pipe is arranged to receive the melt from an external dispenser and for supply of the melt into the crucible with the help of an underpressure in the
  • the inlet bend is equipped with a coupling flange comprising an injection nozzle for gas and powder which shall be supplied to the melt, where the injection nozzle is arranged to receive the gas and powder which are supplied from one or more feeding units and the injection nozzle is arranged to inject gas and powder into the underside of the flowing melt.
  • the coupling flange can comprise an external flange and an inner pipe socket for feeding into the inlet bend and injection housing can be integrated with the inner pipe socket, in which the injection nozzle is preferably placed in the injection housing.
  • the injection nozzle can run straight through the
  • Said one or more feeding units can be one or more sluice feeders which are arranged to portion out the amount of powder which is supplied depending on the tapping amount of the melt that is sucked up.
  • Figure 1 shows a known tapping vehicle
  • Figures 2 - 7 show the filling process of a crucible according to the invention
  • Figure 8 shows a part of an inlet bend with a
  • Figures 9a - 9e show the coupling flange according to the invention, where figure 9c shows a section along the line E-E in figure 9d, and
  • Figure 10 shows details of a section of the stream of melt with the mixture of gas and powder in the inlet bend.
  • a solution is shown with an, in itself known, crucible 10 for transport of molten metal, such as, for example, aluminium melt.
  • the melt 40 is sucked up via a tapping pipe or suction pipe 12 with the help of an underpressure in the crucible 10.
  • This underpressure can be provided with the help of, for example, an ejector 20, whereupon compressed air is provided to create a vacuum in the crucible.
  • the melt 40 flows further through an inlet bend 14 with an internal arched bore 16 and into the inner hollow space 42 of the crucible.
  • the inlet bend 14 is further, equipped with a coupling flange 18 comprising an injection nozzle 28 for gas and powder that is to be supplied to the melt 40.
  • the purpose of the injection nozzle 28 is, besides coupling the tapping pipe 12 and the crucible lid 24 together, to receive gas and powder which is supplied from one or more feeding units, via a hose 34 or a pipe so that the
  • injection nozzle 28 injects gas and powder into the underside of the melt stream and so that the mixture 44 of powder and gas is forced to float through the melt 40 at least once, in the bore 16 of the inlet bend 14.
  • Said feeding unit can, for example, be a sluice feeder to portion the amount of powder which is supplied dependent on the tapping amount of the melt that is sucked up.
  • the coupling flange 18 further comprises an external flange 32 and an inner pipe socket 30 for insertion into the inlet bend 14.
  • An injection housing 26 is integrated with the internal pipe socket 30, and the injection nozzle 28 is placed in the injection housing 26.
  • the injection nozzle 28 preferably runs through the injection housing 26 and ends up inside the pipe socket -30, in an area at the underside of the melt stream.
  • Suitable gaskets can be arranged in or to the coupling flange 18. But with the newly developed coupling flange 18, powder (fluoride) can be injected into the liquid aluminium
  • the coupling flange 18 is, as mentioned, connected to a sluice feeder (not shown) .
  • the sluice feeder can portion out the adjusted amounts of fluoride powder after the tapping amount.
  • Argon gas is added at the feeder outlet to ' fluidise the fluoride powder so that it runs easily.
  • the liquid metal will be sucked up through the tapping pipe 12, as, for example, shown in fig. 2.
  • argon gas that blows in and functions as a start gas
  • the injection preferably takes place in the bottom of the liquid metal, and in or adjoining the inlet of the bore 16 of the inlet bend.
  • the sluice feeder starts to deliver fluoride powder and the argon gas goes from being a start gas to a fluidisation gas to make the powder run easily.
  • the power for transportation of the powder is the large vacuum that arises in the crucible 10 as a consequence of operating the ejector (for example, from -0.6 to -0.85 bar, but other pressures can also be used) . This vacuum can also control the amount of liquid metal that is tapped into the crucible.
  • the coupling flange 18 that makes it possible to inject from the underside of the stream of metal must be adapted to the inlet bend 14 so that it is easy to fit and dismantle. It is also designed so that it can easily be cleaned or re-bored at a possible clogging. This can be carried out without the flange having to be dismantled.
  • the injection will take place as long as liquid metal is tapped into the crucible 10. At the end of the tapping, the fluoride feeder is stopped and injection of fluoride will cease. To keep the dosing hole/nozzle 28 in the coupling flange 18 open, argon gas can still be blown in through the nozzle for a given number of seconds. This is called stop air.
  • gas such as argon gas can be injected down through a delivery pipe 22. This is carried out to stir and/or get the metal in motion, and for the gas bubbles to penetrate/float through the metal. In this way, the metal is brought to the surface and is exposed to oxygen, and the burning off of sodium can thereby occur with the injected fluoride as a reactor during the transport also.
  • the system can comprise different equipment for the process, such as a gas container, control cabinet for gas and associated valves in the system, a gas flow meter, for example, a Rotameter, pipes and hoses, and an electricity supply.
  • a control unit PLS
  • PLS can be connected, with, for example, a display in the form of a LCD screen or the like.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Dispersion Chemistry (AREA)
  • Manufacture Of Metal Powder And Suspensions Thereof (AREA)
  • Furnace Charging Or Discharging (AREA)

Abstract

A method and a device for a crucible (10) are described for temporary storage of a melt (40) such as molten metal, with the crucible (10) being equipped with a lid (24) with an inlet bend (14) that comprises an internal, arched bore (16), and which, via a suction pipe (12) is arranged to receive the melt (40) from an external dispenser and for the feeding of the melt into the crucible (10), with the help of an underpressure in the crucible (10). The inlet bend (14) is equipped with a connecting flange (18) comprising an injection nozzle (28) for gas and powder that shall be added to the melt (40), where the injection nozzle (28) is arranged to receive the gas and the powder that are supplied from one or more feeding units, and that the injection nozzle (28) is arranged to inject gas and powder into the underside of the flowing melt (40).

Description

Method and apparatus for adding powder and gas in a melt.
The present invention relates to a method for addition of powder and gas to a melt, and also a device for a crucible for temporary storage of a melt as described in the preamble of the respective independent claims.
In connection with removal of sodium or other impurities from a melt, for example, liquid aluminium, it is common to feed in or stir in fluoride powder, such as aluminium fluoride powder, with the help of rotors or blowing in appliances to distribute the powder in the melt. After the aluminium is melted in an electrolysis oven the melt is transferred to a crucible on a tapping vehicle, whereupon the crucible with the melt is transported for further treatment. One such tapping vehicle from Hydeq is shown in figure 1, and has been known for many decades. In this known tapping vehicle, melt is sucked up via the tapping pipe with the help of an underpressure in the crucible.
From prior art, NO20063101, shall be referred to, among others, which relates to a method and a device for supply of powder to a melt. The essential features with this known solution are that the powder is added to a melt, where the powder is mixed with a gas and is added to the melt in a tapping pipe, i.e. before the melt enters the pipe bend and the crucible. The melt flows according to known principles from a dispenser via the tapping pipe to a crucible influenced by 'the underpressure in the
crucible, as is known, for example, from the tapping vehicle from Hydeq.
It is clear from said NO20063101 that the powder is added to the melt in the tapping pipe, and nothing else is suggested in said document. One of the big disadvantages with such a solution is that the tapping pipe, or the suction pipe, during the cleaning process with the
addition of fluoride powder for removal of sodium, large problems may arise with clogging of nozzles and burning• and deformation of the injector. It is also difficult to adjust the powder feeder because of varying static and dynamic pressure in the tapping pipe. Furthermore, there will be much wear of tapping pipes and pipe bends because of the generation of heat, something which leads to increased costs with regard to replacing parts and use of time.
By injection into the tapping pipes one gets a longer supply hose for fluoride powder, and more argon gas must be used to bring the powder up to the nozzle. The hose must also be put down such that there is little bend in the hose to avoid blocking. This is difficult to ensure with a pipe that is articulated. The gas which is supplied in the tapping pipe leads to a considerable increase in the speed as a consequence of the volume expansion (the gas expands about four times at the temperature range the work is carried out at). Because of the speed that arises the temperature increases greatly and one gets burning of the pipe and bend material. This is the case with cast iron and ceramic materials. Because of this reaction, it is inconceivable to inject into the tapping pipe. The , equipment is burnt out after 2-3 attempts.
By injection in the inlet bend (preferably at the bottom of the bend) , the problems with the volume expansion are avoided. Here the diameter of the bend^ can be increased and this eliminates overheating and thereby burning of ' material (the shape of the bend) . Much better mixing-in of the fluoride powder is achieved because of the powder floating through the metal several times. By injection into the tapping pipe, much of the fluoride powder remains in gas bubbles. This leads to poorer mixing into the molten metal. Tests that have been carried out show this. In practical use it is only injection into inlet bends that is useful as an alternative to injection into the crucible. Injection into the tapping pipe is not realisable in practice, only for individual tests. In that the powder and gas are supplied in the inlet pipe to the crucible, i.e. the inlet bend, the above mentioned
problems with, for one thing, overheating of the tapping pipes, are avoided.
Consequently, it is an object of the present invention to provide a new solution for supplying powder to a melt, where the above mentioned problems are avoided. It is also an object to provide a device for a crucible for the addition of powder and gas into a melt which makes it possible for the powder to be well blended into the melt stream, at the same time as the problems with overheating of the equipment are avoided, and which also lead to cost savings .
The above mentioned objects are obtained with a method as given in the independent claim 1, for supplying powder and gas to a melt, such as molten metal, which is transferred to a crucible, with the crucible being subjected to an underpressure to suck up the melt from an external
dispenser, via a suction pipe placed between the crucible and the dispenser, and into the crucible through an inlet, bend with an internal arched boring, in which the powder and gas are added to the melt during the suction process. The method is characterised in that when the melt is sucked into the crucible at a certain speed, a feeder starts the supply of powder to the melt at the same time as a fluidisation gas is supplied to the powder, with the supply taking place when the melt comes into said inlet bend and the powder and gas are injected into the melt in the inlet bend, into the underside of the flowing melt via an injection nozzle. , Alternative embodiments of the method are given in the respective dependent method claims.
The internal bore of the inlet bend is preferably being shaped so that the powder and the gas, after the stream of melt turns, are forced to float through the melt for a second time.
The amount of powder that is added depends on the tapping amount of the melt which is sucked up. During start-up and shut-down of the suction process, it can be supplied only gas to the injection nozzle so that this is not blocked up.
It is preferred that the molten metal which is sucked up into the crucible is aluminium melt, and the gas which is supplied is preferably argon gas and the powder which is supplied is preferably a fluoride powder.
The above mentioned objects are also achieved with a device as given in the independent claim 6, for a crucible for temporary storage of a melt, such' as molten metal, with the crucible being equipped with a lid with an inlet bend which comprises an internal arched bore, which, via a suction pipe is arranged to receive the melt from an external dispenser and for supply of the melt into the crucible with the help of an underpressure in the
crucible. The inlet bend is equipped with a coupling flange comprising an injection nozzle for gas and powder which shall be supplied to the melt, where the injection nozzle is arranged to receive the gas and powder which are supplied from one or more feeding units and the injection nozzle is arranged to inject gas and powder into the underside of the flowing melt.
Alternative embodiments of the device are given in the respective, dependent device claims.
The coupling flange can comprise an external flange and an inner pipe socket for feeding into the inlet bend and injection housing can be integrated with the inner pipe socket, in which the injection nozzle is preferably placed in the injection housing.
The injection nozzle can run straight through the
injection housing and end up inside the pipe socket in an area on the underside of the melt stream.
Said one or more feeding units can be one or more sluice feeders which are arranged to portion out the amount of powder which is supplied depending on the tapping amount of the melt that is sucked up.
The invention shall now be described in more detail with the help of an embodiment example shown in the figures, in which:
Figure 1 shows a known tapping vehicle,
Figures 2 - 7 show the filling process of a crucible according to the invention,
Figure 8 shows a part of an inlet bend with a
coupling flange according to the invention,
Figures 9a - 9e show the coupling flange according to the invention, where figure 9c shows a section along the line E-E in figure 9d, and
Figure 10 shows details of a section of the stream of melt with the mixture of gas and powder in the inlet bend. As can be seen in the figures a solution is shown with an, in itself known, crucible 10 for transport of molten metal, such as, for example, aluminium melt. The melt 40 is sucked up via a tapping pipe or suction pipe 12 with the help of an underpressure in the crucible 10. This underpressure can be provided with the help of, for example, an ejector 20, whereupon compressed air is provided to create a vacuum in the crucible. The melt 40 flows further through an inlet bend 14 with an internal arched bore 16 and into the inner hollow space 42 of the crucible.
The inlet bend 14 is further, equipped with a coupling flange 18 comprising an injection nozzle 28 for gas and powder that is to be supplied to the melt 40. The purpose of the injection nozzle 28 is, besides coupling the tapping pipe 12 and the crucible lid 24 together, to receive gas and powder which is supplied from one or more feeding units, via a hose 34 or a pipe so that the
injection nozzle 28 injects gas and powder into the underside of the melt stream and so that the mixture 44 of powder and gas is forced to float through the melt 40 at least once, in the bore 16 of the inlet bend 14. Said feeding unit can, for example, be a sluice feeder to portion the amount of powder which is supplied dependent on the tapping amount of the melt that is sucked up.
The coupling flange 18 further comprises an external flange 32 and an inner pipe socket 30 for insertion into the inlet bend 14. An injection housing 26 is integrated with the internal pipe socket 30, and the injection nozzle 28 is placed in the injection housing 26.' The injection nozzle 28 preferably runs through the injection housing 26 and ends up inside the pipe socket -30, in an area at the underside of the melt stream. Suitable gaskets can be arranged in or to the coupling flange 18. But with the newly developed coupling flange 18, powder (fluoride) can be injected into the liquid aluminium
," molten metal. This can take place in the following way:
The coupling flange 18 is, as mentioned, connected to a sluice feeder (not shown) . The sluice feeder can portion out the adjusted amounts of fluoride powder after the tapping amount. Argon gas is added at the feeder outlet to' fluidise the fluoride powder so that it runs easily. When the compressed air is fed to the ejector 20 on the
.crucible lid 24, a vacuum is formed in the crucible 10.
After the vacuum is down to, for example, -0.6 bar, the liquid metal will be sucked up through the tapping pipe 12, as, for example, shown in fig. 2.
So that the injection nozzle 28 in the coupling flange 18 shall not become blocked up during the start of the
tapping, argon gas that blows in and functions as a start gas can be used. As shown in, for example, figures 5 and 6, the injection preferably takes place in the bottom of the liquid metal, and in or adjoining the inlet of the bore 16 of the inlet bend. When the metal is sucked into the crucible 10 at a certain speed, the sluice feeder starts to deliver fluoride powder and the argon gas goes from being a start gas to a fluidisation gas to make the powder run easily. The power for transportation of the powder is the large vacuum that arises in the crucible 10 as a consequence of operating the ejector (for example, from -0.6 to -0.85 bar, but other pressures can also be used) . This vacuum can also control the amount of liquid metal that is tapped into the crucible.
As mentioned, it is of great importance for the cleaning process that- the injection takes place in the bottom or the underside of the liquid metal, so that the fluoride powder/argon gas floats up through the metal and is well mixed in. This is illustrated in figures 5 and 6 and in more detail in figure 10 where the metal stream is turned the other way so that the powder/gas is forced to float through the metal for the second time. The inlet bend 14 and its shape are consequently very important components for the process to function as well as possible, but it shall be mentioned that the bore 16, as it is shown in the figures, does not need to have the shown curvature or radius. The coupling flange 18 that makes it possible to inject from the underside of the stream of metal must be adapted to the inlet bend 14 so that it is easy to fit and dismantle. It is also designed so that it can easily be cleaned or re-bored at a possible clogging. This can be carried out without the flange having to be dismantled.
The injection will take place as long as liquid metal is tapped into the crucible 10. At the end of the tapping, the fluoride feeder is stopped and injection of fluoride will cease. To keep the dosing hole/nozzle 28 in the coupling flange 18 open, argon gas can still be blown in through the nozzle for a given number of seconds. This is called stop air.
During transport of the crucible 10, gas such as argon gas can be injected down through a delivery pipe 22. This is carried out to stir and/or get the metal in motion, and for the gas bubbles to penetrate/float through the metal. In this way, the metal is brought to the surface and is exposed to oxygen, and the burning off of sodium can thereby occur with the injected fluoride as a reactor during the transport also.
Furthermore, the system can comprise different equipment for the process, such as a gas container, control cabinet for gas and associated valves in the system, a gas flow meter, for example, a Rotameter, pipes and hoses, and an electricity supply. Furthermore, a control unit (PLS) can be connected, with, for example, a display in the form of a LCD screen or the like.

Claims

Claims
1. Method for adding powder and gas to a melt (40), such as molten metal, which is transferred to a crucible (10) , with the crucible (10) being subjected to an underpressure to suck up the melt from an external dispenser, via a suction pipe (12) placed between the crucible (10) and the dispenser, and into the crucible (10) through an inlet bend (14) with an internal arched bore (16), in which powder and gas are supplied to the melt (40) during the suction process, c h a r a c t e r i s e d i n that
when the melt is sucked into the crucible (10) at a certain speed, a feeder starts the supply of powder to the melt (40), at the same time as a fluidisation gas is fed to the powder, with the supply taking place when the melt enters said inlet bend (14), and
the powder and the gas are injected in the melt (40) in the inlet bend (14), into the underside of the flowing melt via an injection nozzle (28).
2. Method according to claim 1,
c h a r a c t e r i s e d i n that the internal bore (16) of the inlet bend (14) is being designed such that the powder and the gas, after the flow of melt turns, are forced to float through the melt (40) for a second time.
3. Method according to claim 1,
c h a r a c t e r i s e d i n that the amount of powder that is added is controlled according to the tapping amount of the melt (40) which is being sucked up.
4. Method according to claim 1,
c h a r a c t e r i s e d i n that during starting up and shutting down of the suction process, only gas is supplied to the injection nozzle (28) so that it is not clogged up.
5. Method according to claim 1,
c h a r a c t e r i s e d i n that the molten metal that is sucked up into the crucible (10) is an aluminium melt, the gas that is supplied is argon gas and the powder that is supplied is a fluoride powder.
6. Device for a crucible (10) for temporary storage of a melt (40), such as molten metal, with the crucible (10) being equipped with a lid (24) with an inlet bend (14) that comprises an internal, arched bore (16), and which, via a suction pipe (12) is arranged to receive the melt (40) from an external dispenser and for leading the melt into the crucible (10), with the help of an underpressure in the crucible (10) , c h a r a c t e r i s e d i n that the inlet bend (14) is equipped with a connecting flange (18) comprising an injection nozzle (28) for gas and powder that shall be added to the melt (40), where the injection nozzle (28) is arranged to receive gas and powder that are added from one or more feeding units, and that the injection nozzle (28) is arranged to inject gas and powder into the underside of the flowing melt (40).
7. Device according to claim 6,
c h a r a c t e r i s e d i n that the connecting flange (18) comprises an internal flange (32) and an internal pipe socket (30) for insertion into the inlet bend (14) and that an injection housing (26) is integrated with the internal pipe socket (30), in which the injection nozzle (28) is placed in the injection housing (26).
8. Device according to claim 7,
c h a r a c t e r i s e d i n that the injection nozzle (28) runs through the injection housing (26) and ends up inside the pipe socket (30), at an area on the underside of the flow of melt (40) .
9. Device according to claim 6,
c h a r a c t e r i s e d i n that said one or more feeding units is a sluice feeder, arranged to portion out the amount of powder which is supplied dependent on the^ amount of tapping of the melt (40) that is sucked up.
PCT/NO2010/000300 2009-08-21 2010-08-11 Method and apparatus for adding powder and gas in a melt WO2011021940A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP10810233A EP2467503A1 (en) 2009-08-21 2010-08-11 Method and apparatus for adding powder and gas in a melt

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20092875A NO20092875A1 (en) 2009-08-21 2009-08-21 Method and device for supplying a melt to a crucible
NO20092875 2009-08-21

Publications (1)

Publication Number Publication Date
WO2011021940A1 true WO2011021940A1 (en) 2011-02-24

Family

ID=43607198

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NO2010/000300 WO2011021940A1 (en) 2009-08-21 2010-08-11 Method and apparatus for adding powder and gas in a melt

Country Status (3)

Country Link
EP (1) EP2467503A1 (en)
NO (1) NO20092875A1 (en)
WO (1) WO2011021940A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NO20150703A1 (en) * 2015-06-01 2016-12-02 Hmr Hydeq As A molten metal and powder adding and mixing system and a system for the production of metal
NO20210630A1 (en) * 2021-05-21 2022-11-22 Norsk Hydro As Na removal from pot-room Al metal with under-pressure and forced convection

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5318278A (en) * 1991-07-05 1994-06-07 Vaw Aluminium Ag Apparatus for making mixtures of reactive melts
NO319478B1 (en) * 2004-09-21 2005-08-15 Alu Innovation As Method and apparatus for adding powder to a metal melt
WO2008010721A1 (en) * 2006-07-04 2008-01-24 Heggset Teknologi As A method and device for admixture of powder in a liquid

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5318278A (en) * 1991-07-05 1994-06-07 Vaw Aluminium Ag Apparatus for making mixtures of reactive melts
NO319478B1 (en) * 2004-09-21 2005-08-15 Alu Innovation As Method and apparatus for adding powder to a metal melt
WO2008010721A1 (en) * 2006-07-04 2008-01-24 Heggset Teknologi As A method and device for admixture of powder in a liquid

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NO20150703A1 (en) * 2015-06-01 2016-12-02 Hmr Hydeq As A molten metal and powder adding and mixing system and a system for the production of metal
WO2016195507A1 (en) * 2015-06-01 2016-12-08 Hmr Hydeq As A molten metal and powder adding and mixing system and a metal production system
CN108138259A (en) * 2015-06-01 2018-06-08 Hmr海代克股份有限公司 Molten metal and powder addition and hybrid system and Metal Production system
NO342536B1 (en) * 2015-06-01 2018-06-11 Hmr Hydeq As A molten metal and powder adding and mixing system and a system for the production of metal
CN108138259B (en) * 2015-06-01 2019-10-11 Hmr海代克股份有限公司 Molten metal and powder addition and hybrid system and Metal Production system
NO20210630A1 (en) * 2021-05-21 2022-11-22 Norsk Hydro As Na removal from pot-room Al metal with under-pressure and forced convection

Also Published As

Publication number Publication date
NO330023B1 (en) 2011-02-07
NO20092875A1 (en) 2011-02-07
EP2467503A1 (en) 2012-06-27

Similar Documents

Publication Publication Date Title
KR20010040095A (en) Producing method of molten metal from metaliferus feed material
RU2448764C2 (en) Method and device for adding powder to fluid
KR101377375B1 (en) Method and device for charging processing plants
EP2467503A1 (en) Method and apparatus for adding powder and gas in a melt
TW201201911A (en) Apparatus for supplying multiple burners with fine-grained fuel
EP0556343A1 (en) Jet flow device for injecting gas into molten metal.
CN210993813U (en) Fracturing fluid preparation system
TW391905B (en) Apparatus and process for alternatively creating flame or ceramic welding
KR100332067B1 (en) Apparatus feeding powder material
JP5372348B2 (en) Hot refractory spraying apparatus and hot refractory spraying construction method
CN211914313U (en) Slag pot spraying device
CN106466551A (en) A kind of apparatus system being applied to flue gas and powder hybrid reaction
CN204457592U (en) Gas drilling solid implanter
CN108283907A (en) Dispensation apparatus
CN209555296U (en) A kind of RH refining rotating injecting powder device
JP2008057967A (en) Tube interior cleaning method for fueling nozzle
CN107934588A (en) A kind of oxalic acid conveying device and catalysis degreasing device
JP2008032388A (en) Method and device for manufacturing/supplying coal-water paste
JP3185655B2 (en) Method and apparatus for manufacturing coal ash improvement treatment material
CN103821493B (en) The continuous mixture of acidizing and fracturing fluid is for delivery method
KR200167463Y1 (en) Separable submerged entry nozzle for tundish recycling
CN218656813U (en) Processing apparatus for high-entropy alloy injection molding
CN207357062U (en) A kind of mixing production equipment of fireproof coating
CN108800119A (en) A kind of smelting furnace undercurrent spray combustion device
CN216500117U (en) Spray gun outlet pitching fine adjustment mechanism, spray gun support frame and wet injection device

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 10810233

Country of ref document: EP

Kind code of ref document: A1

DPE2 Request for preliminary examination filed before expiration of 19th month from priority date (pct application filed from 20040101)
NENP Non-entry into the national phase

Ref country code: DE

WWE Wipo information: entry into national phase

Ref document number: 2010810233

Country of ref document: EP