EP0333586B1 - Anlage zum Entfernen von gas- oder festförmigen Verunreinigungen aus einem flüssigen Produkt, welches sich in einem Behälter befindet - Google Patents

Anlage zum Entfernen von gas- oder festförmigen Verunreinigungen aus einem flüssigen Produkt, welches sich in einem Behälter befindet Download PDF

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Publication number
EP0333586B1
EP0333586B1 EP89400726A EP89400726A EP0333586B1 EP 0333586 B1 EP0333586 B1 EP 0333586B1 EP 89400726 A EP89400726 A EP 89400726A EP 89400726 A EP89400726 A EP 89400726A EP 0333586 B1 EP0333586 B1 EP 0333586B1
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EP
European Patent Office
Prior art keywords
head
rotor
liquid metal
rotary shaft
inert gas
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
EP89400726A
Other languages
English (en)
French (fr)
Other versions
EP0333586A1 (de
Inventor
Roland Le Floch
Maurice Oliveira
Nin David Colom
Sylvestre Georges Emile Vire
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.)
Alusuisse Lonza France SA
Original Assignee
Alusuisse Lonza France SA
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 Alusuisse Lonza France SA filed Critical Alusuisse Lonza France SA
Priority to AT89400726T priority Critical patent/ATE89328T1/de
Publication of EP0333586A1 publication Critical patent/EP0333586A1/de
Application granted granted Critical
Publication of EP0333586B1 publication Critical patent/EP0333586B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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

Definitions

  • the invention relates to a device for removing impurities present in gaseous and solid form in a liquid product such as liquid metal contained in a tank such as a transport bag.
  • Document US Pat. No. 4,556,419 describes a device for removing impurities present in gaseous and solid form in a liquid metal contained in a tank such as a transport pocket, of the type comprising a rotor which comprises a rotary shaft carrying its free end to be immersed in said liquid metal, a stirring head provided with an internal chamber connected to a source of an inert gas by an axial channel formed along the rotary shaft and communicating with the outside to allow the diffusion of the inert gas in the liquid metal.
  • the gas In the operating state of the device, under the effect of the rotary movement of the head and the flow of gas outwards, the gas is ejected into the liquid metal under the effect of centrifugal force. A mixing of the liquid in the reservoir is also obtained by the formation of gas bubbles which entrain, during their ascent, the impurities in the form of gas and solid bodies.
  • the brewing head member has a complex structure, and to function effectively, the speed of rotation of the head must have a very high value. Usually the minimum value is 400 revolutions per minute. Despite this, it turns out that the distribution of gas in the form of bubbles in the liquid is not sufficiently uniform and the bubbles are not small enough.
  • the object of the present invention is to propose a device which overcomes the drawbacks mentioned above.
  • the rotor head of the device comprises radial fins distributed uniformly around the axis of the head and the radial height of which increases from top to bottom on the head, the latter being made of a material porous, so that its walls as well as fins have a porous structure permeable to the gas contained in the internal chamber of the rotor.
  • the device according to the invention is characterized in that the rotor shaft and the head are assembled by screwing.
  • the rotor is provided with a threaded axial endpiece intended to engage in a threaded orifice of the rotor head.
  • the rotor shaft is made of a refractory material such as graphite.
  • the device comprises means for preheating the rotor head, to expel the moisture contained therein.
  • the invention is also characterized in that the aforementioned preheating means are formed by a heating tank in which the lower end of the rotor can be immersed.
  • Figure 1 there is shown the use of a device 1 according to the invention for removing impurities present in gaseous and solid form, from a liquid metal contained in a transport bag 2 of this metal. It can be seen that the device has been introduced inside the pocket through an orifice 3 made in the cover of the pocket. At 4 there is shown schematically the closure cap of the orifice 3. The reference 5 designates the level of the liquid metal in the pocket 2.
  • the device 1 according to the invention is formed by a rotor essentially comprising a shaft 7 made of a refractory material such as graphite, which carries at its lower end immersed in the liquid a mixing head 8 and is integral at its upper end with a rotary drive shaft 9.
  • the latter is mounted on a suitable support such as a pivoting frame or arm, of any structure known per se and therefore not shown. Thanks to this support, the device according to the invention is capable of pivoting between a rest position and a position above the reservoir to be filled, that is to say the bag 2.
  • the device according to the invention formed by the rotor 1 can be introduced into or removed from the pocket 2.
  • the member forming the mixing head 8 of the rotor comprises a substantially cylindrical central part 11, which carries on its external cylindrical surface a number of mixing fins 12 which are distributed regularly around the central part 11
  • the radially outer face 13 of each fin is inclined relative to the axis XX of the rotor, at a predetermined angle ⁇ so that the height a of a fin increases from top to bottom on the head 8.
  • the mixing head 8 has a central chamber 14 which communicates through an axial channel 15 in the rotor shaft 7 with a source of an inert gas such as nitrogen or argon, via an axial channel 16 formed in the rotational drive shaft 9 of the stirring head 8.
  • a source of an inert gas such as nitrogen or argon
  • the latter is made of a porous refractory material, permeable to inert gas, such as for example porous graphite.
  • inert gas such as for example porous graphite.
  • the stirring and gas outlet head 8 of the device according to the invention can be assembled to the rotor 7 in any suitable way, advantageously by screwing, as in the example shown.
  • the head 8 has above its chamber 14 in communication with the latter a threaded recess 19 in which a threaded axial end piece 20 of the rotor shaft 7 is screwed.
  • the device according to the invention appears from the description of its structure which has just been made.
  • the device in the form of a rotor 1 of the invention is brought by pivoting and then by vertical movement into its working position shown in FIG. 1.
  • the rotor is driven in rotation and the inert gas is sent to the chamber 14 of the head, which allows the formation of very fine bubbles which are distributed regularly in the liquid metal, as has been described above.
  • Due to the porous structure of the head 8 of the rotor it is advantageous to subject the head to a preheating treatment to remove moisture from the pores of the head.
  • a preheating tank, not shown is advantageously used, into which the lower part of the head can be immersed, in its rest position before it is pivoted into the working position.
  • the invention allows the formation of much finer bubbles and a better distribution of these in the liquid.
  • the speed of rotation of the head 8 can be lower in the case of the invention, for example of the order of 200 or even 180 to 300 revolutions per minute, while in known devices , the speed must in principle be greater than 400 rpm. All these features of the invention not only allow a better effect of purifying the liquid, by stirring and degassing, but also provides a considerable time saving compared to known devices.
  • the relatively low speed of rotation of the rotor in the case of the invention, the formation of a vortex in the transport pocket is avoided.
  • An advantage of the taper of the fins lies in the fact that the active porous surface through which bubbles enter the bath and thus the shear surface increasing downward, which acts in the direction of compensating for the increase in the pressure in the bath.
  • the invention provides a reduction in gas consumption.
  • the good distribution of fine bubbles in the liquid allows an increase in the volume of the transport bags.
  • the angle of inclination ⁇ of the fins can vary depending on the nature of the liquid to optimize the operation of the device according to the invention.
  • the central part 11 of the stirring and degassing head 8 can have any suitable shape, different from the cylindrical shape shown.
  • the device according to the invention can be used to remove impurities from any product other than liquid metal. It should also be noted that the sending of the inert gas into the head of the rotor can begin before the latter starts to rotate and still take place after it has stopped.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Gas Separation By Absorption (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)

Claims (6)

  1. Vorrichtung zum Entfernen von in Gas- und Feststoffform vorhandenen Verunreinigungen aus einem in einem Behälter, wie einer Transportpfanne enthaltenen flüssigen Metall, derjenigen Gattung mit einem Rotor, der eine drehbare Welle umfasst, die an ihrem in das besagte flüssige Metall einzutauchenden freien Ende einen mit einer inneren Kammer versehenen Rührkopf trägt, welche mit einer inerten Gasquelle durch einen entlang der drehbaren Welle gebildeten axialen Kanal verbunden ist und mit dem Aussenraum in Verbindung steht, und das Diffundieren des inerten Gases in dem flüssigen Metall gestattet, wobei der Rotorkopf (8) gleichmässig um die Achse des Kopfes (8) herum verteilte Radialrippen (12) aufweist, deren radiale Höhe (a) von oben nach unten an dem Kopf zunimmt, wobei dieser letztere aus einem porösen Werkstoff hergestellt ist, damit seine Wandungen sowie die Rippen (12) ein für das in der inneren Kammer (14) des Rotors (1) enthaltene Gas durchlässiges poröses Gefüge aufweisen.
  2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass die Welle (7) des Rotors und der Kopf (8) durch Verschrauben zusammengefügt sind.
  3. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, dass der Rotor mit einem, für das Einführen in ein Gewindeloch (19) des Rotorkopfes (8) bestimmten axialen Gewindezapfen (20) versehen ist.
  4. Vorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, dass die Rotorwelle (7) aus einem feuerfesten Werkstoff, zum Beispiel aus Graphit hergestellt wird.
  5. Vorrichtung nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass sie Mittel zum Vorwärmen des Rotorkopfes (8) aufweist, um die in diesem enthaltene Feuchtigkeit zu entfernen.
  6. Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, dass die vorgenannten Vorwärmemittel durch eine Heizwanne, in welche das untere Ende des Rotors (1) eingetaucht werden kann, gebildet sind.
EP89400726A 1988-03-15 1989-03-15 Anlage zum Entfernen von gas- oder festförmigen Verunreinigungen aus einem flüssigen Produkt, welches sich in einem Behälter befindet Expired - Lifetime EP0333586B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89400726T ATE89328T1 (de) 1988-03-15 1989-03-15 Anlage zum entfernen von gas- oder festfoermigen verunreinigungen aus einem fluessigen produkt, welches sich in einem behaelter befindet.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8803349 1988-03-15
FR8803349A FR2628756B1 (fr) 1988-03-15 1988-03-15 Dispositif pour eliminer des impuretes presentes sous forme gazeuse et solide dans un produit liquide contenu dans un reservoir

Publications (2)

Publication Number Publication Date
EP0333586A1 EP0333586A1 (de) 1989-09-20
EP0333586B1 true EP0333586B1 (de) 1993-05-12

Family

ID=9364282

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89400726A Expired - Lifetime EP0333586B1 (de) 1988-03-15 1989-03-15 Anlage zum Entfernen von gas- oder festförmigen Verunreinigungen aus einem flüssigen Produkt, welches sich in einem Behälter befindet

Country Status (6)

Country Link
EP (1) EP0333586B1 (de)
AT (1) ATE89328T1 (de)
DE (2) DE333586T1 (de)
ES (1) ES2011760A4 (de)
FR (1) FR2628756B1 (de)
GR (1) GR890300190T1 (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4954167A (en) * 1988-07-22 1990-09-04 Cooper Paul V Dispersing gas into molten metal
FR2669041B1 (fr) * 1990-11-09 1994-02-04 Sfrm Procede pour le traitement d'un metal en fusion et son transfert dans un espace recepteur et systeme pour la mise en óoeuvre de ce procede.
JP3520286B2 (ja) * 1996-07-16 2004-04-19 ペシネー・ジャポン株式会社 金属溶湯処理用回転式処浬ガス拡散装置
FR2763079B1 (fr) * 1997-05-07 1999-07-30 Graphitech Rotor et installation pour le traitement d'un bain de metal liquide
FR2815642B1 (fr) * 2000-10-20 2003-07-11 Pechiney Rhenalu Dispositif rotatif de dispersion de gaz pour le traitement d'un bain de metal liquide

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3521874A (en) * 1967-05-12 1970-07-28 Reynolds Metals Co Gas diffuser unit for use in treating molten metal
US3917242A (en) * 1973-05-18 1975-11-04 Southwire Co Apparatus for fluxing and filtering of molten metal
US3904180A (en) * 1973-05-18 1975-09-09 Southwire Co Apparatus for fluxing and filtering of molten metal
US4047938A (en) * 1974-12-23 1977-09-13 Union Carbide Corporation Process for refining molten metal
US4556419A (en) * 1983-10-21 1985-12-03 Showa Aluminum Corporation Process for treating molten aluminum to remove hydrogen gas and non-metallic inclusions therefrom

Also Published As

Publication number Publication date
GR890300190T1 (en) 1990-10-31
EP0333586A1 (de) 1989-09-20
DE68906444D1 (de) 1993-06-17
DE333586T1 (de) 1990-02-08
FR2628756B1 (fr) 1992-05-22
ES2011760A4 (es) 1990-02-16
FR2628756A1 (fr) 1989-09-22
ATE89328T1 (de) 1993-05-15

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