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)

Applications Claiming Priority (2)

Publications (1)

Family

ID=43607198

Family Applications (1)

Country Status (3)

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Family Cites Families (3)

• 2009
  • 2009-08-21 NO NO20092875A patent/NO20092875A1/no active IP Right Review Request
• 2010
  • 2010-08-11 WO PCT/NO2010/000300 patent/WO2011021940A1/en not_active Ceased
  • 2010-08-11 EP EP10810233A patent/EP2467503A1/de not_active Withdrawn

Non-Patent Citations (1)

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