EP0916066B1 - Rührer zum einbringen von gas bei der behandlung eines aluminiumbades - Google Patents

Rührer zum einbringen von gas bei der behandlung eines aluminiumbades Download PDF

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Publication number
EP0916066B1
EP0916066B1 EP97935603A EP97935603A EP0916066B1 EP 0916066 B1 EP0916066 B1 EP 0916066B1 EP 97935603 A EP97935603 A EP 97935603A EP 97935603 A EP97935603 A EP 97935603A EP 0916066 B1 EP0916066 B1 EP 0916066B1
Authority
EP
European Patent Office
Prior art keywords
blades
rotor
gas
bath
diameter
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
EP97935603A
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English (en)
French (fr)
Other versions
EP0916066A1 (de
Inventor
Pierre Le Brun
Catherine Xuereb
Jo[L Bertrand
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.)
Rio Tinto France SAS
Constellium Issoire SAS
Original Assignee
Aluminium Pechiney SA
Pechiney Rhenalu SAS
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 Aluminium Pechiney SA, Pechiney Rhenalu SAS filed Critical Aluminium Pechiney SA
Publication of EP0916066A1 publication Critical patent/EP0916066A1/de
Application granted granted Critical
Publication of EP0916066B1 publication Critical patent/EP0916066B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D27/00—Stirring devices for molten material
    • 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
    • C22B9/05—Refining by treating with gases, e.g. gas flushing also refining by means of a material generating gas in situ

Definitions

  • the invention relates to a rotary gas dispersing device for treatment of a liquid bath of aluminum or its alloys.
  • aluminum will be used in the generic sense of "Aluminum and its alloys”.
  • Liquid aluminum leaving electrolytic cells or reflow ovens contains dissolved or suspended impurities.
  • the most important of these impurities are hydrogen, alkaline elements such as sodium or calcium and the oxides, in particular the aluminum oxide itself.
  • liquid aluminum is subjected to various treatments to eliminate impurities.
  • the most common of these treatments which uses a combination of chemical reactions and flotation phenomena, involves introducing into the bath in the form of small bubbles an inert or reactive gas.
  • an inert or reactive gas For example a bubble of argon will bring with it on the surface of the bath a solid inclusion in suspension.
  • a chlorine bubble will react with the sodium contained and give a sodium salt which will also be transported to the surface of the bath.
  • Such treatments by the action of gases can be carried out in discontinuous in an oven or in a crucible. But they are most generally carried out continuously between the furnace and the casting machine in a treatment of the type that is schematically represented in the figure 1.
  • the liquid metal to be treated enters the first compartment (2) of the pocket by an inlet spout (1). It is treated on the way by gas bubbles (4) dispersed by the rotary device (3). The metal thus treated overflows in a outlet compartment (5) equipped with a baffle (6) and pocket spring by the outlet spout (7).
  • the gas to be dispersed in the liquid bath is still injected a few times with simple canes but the most common technique is to use a rotary dispersing device composed of a hollow axis of rotation through which arrives the gas and a rotor of the most suitable form to disperse the gas bubbles in the bath.
  • the effectiveness of the treatment is obviously maximum when the exchange surface between the bath and the gas is itself maximum. This is achieved by designing the rotor to obtain very small bubbles, project these bubbles throughout the volume (the least dead volume possible) and create recirculations of the bath itself so that it comes in contact with bubbles (always as little dead volume as possible).
  • Patent application EP 0347108 proposes to combine gas treatment and filtration in the same device.
  • a filter layer is interposed between the gas injection rotor and the surface of the liquid metal. Gas bubbles cross the filter up to the surface and it is understandable that the surface turbulence must be very reduced, the filter playing a role distribution of the bubbles and breaking any large broths.
  • filter which becomes clogged and must be periodically renewed, is a device expensive and difficult to operate; on the other hand, the size of the rotor is necessarily reduced to facilitate passage through the filter layer and ensure tightness at this level.
  • Patent application EP 0611830 proposes to provide at the bottom of the tank for treats a baffle across its entire width.
  • This chicane goes to the right of the rotor (s) and, by modifying the bubble distribution fields and metal circulation, would reduce the disturbances of surface or, which amounts to the same thing, to increase the quantity of gas injected and the speed of rotation of the rotor without increasing these surface disturbances.
  • This solution has a considerable practical drawback. As and when as liquid metal passes through the tank, dross builds up around of the privileged area that constitutes the chicane and it is necessary to clean very often the chicane in particularly difficult conditions.
  • Japanese patent application JP 06-273074 very specifically targets the decrease in surface agitation and teaches an improved rotor for this purpose.
  • Experience shows that the use of such a rotor effectively reduces the permanent phenomenon of “surface waves” but that it occurs periodically and inadvertently projections on the surface of the bath which have negative consequences on the resumption of inclusions.
  • the Applicant has sought to develop a rotary dispersing device of gas which makes it possible to reduce both the agitation phenomena of surface, episodic projections and vortex without requiring modifications to the tank itself such as a filter layer or a chicane and without reducing the effectiveness of the treatment.
  • the object of the invention is a rotary gas dispersing device for the continuous treatment of a bath of liquid aluminum in a tank treatment comprising a drive shaft serving as a gas inlet and a rotor, said rotor consisting of an even number of blades arranged in a star around a central hub and a substantially flat disc covering the star formed by the blades, the gas being injected into the bath through orifices located between the blades, the ratio between the outside diameter of the rotor and the diameter of its central hub being between 1.5 and 4, characterized in that are alternating complete blades having a given contact surface with the bath and reduced blades having a larger contact surface with the bath low delO at 30% compared to the contact surface of the complete blades.
  • the drive shaft has at its lower end a threaded part or a threaded part intended for fixing the rotor.
  • the rotor itself has a central hub and a threaded tube for fixing the rotor to the part or threaded part of the drive shaft.
  • At this central hub are fixed blades arranged in spokes. The number of these blades can be variable, even or odd. If the number of blades is too low, agitation and therefore the effectiveness of the treatment may prove to be insufficient. A number of blades too high leads to a more difficult assembly and therefore more expensive. The choice depends on the case by case of the volumes of metal to be treated in a given time, the size of the tank which can be a compartment or with several compartments, etc ... Under the usual conditions of aluminum treatment, a number of blades between 6 and 8 constitutes a good compromise.
  • the blades generally have a rectangular shape but one can also use trapezoidal blades where the blade height is lower at the outer end thereof only at its connection to the hub central and even triangular blades where the height of the blade is zero at its outer end.
  • the shape of the blade must be such that, taking into account its height and the configuration of the injection orifices which will be discussed more far, most of the injected gas is taken up and dispersed by the blade.
  • the rotor has a substantially horizontal disc whose diameter is equal or close to the outside diameter of the star constituted by the blades. This disc is positioned above the star formed by the blades. It is advantageous to give the upper side of the disc a slightly tapered shape in order to facilitate the flow of liquid metal when the rotor is removed vertically from the tank. It is not recommended to choose a diameter smaller than diameter defined by the star formed by the blades. As soon as the end of the blades exceeds the diameter of the disc, the anti-wave effect of the device decreases considerably. In the other direction, on the other hand, the anti-wave effect is maintained even if the diameter of the disc is greater than the diameter defined by the star of the blades. There is little point, however, in adopting such a configuration. And, in the preferred version of the invention, we do substantially coincide disc diameter and outer diameter of the star that are the blades.
  • the external diameter of the rotor according to the invention is variable. As for rotors of the prior art, it depends on the volume to be treated, on the size of the tank, of the shape of the tank with one or more compartments.
  • the rotor according to the invention is characterized by a high lift of the blades.
  • the lift of the blades can be defined by the ratio between the outside diameter of the rotor and the diameter of its central hub.
  • the rotors of the prior art have a weak blade lift because an increase in lift would cause an increase in surface agitation.
  • a typical example of a rotor of the prior art with low lift of blades is given by rotor A from the example given below.
  • the increase in the lift of the blades has however limits. Below a certain ratio, the rotor is difficult to to manufacture, fragile and expensive. Beyond a certain ratio, the beneficial effect of lift of the blades becomes negligible. Under the usual conditions of aluminum industry tanks, a range for the ratio of 1.5 to 4 represents a good compromise.
  • the rotor according to the invention comprises an even number of blades, blades "Complete” alternating with blades whose surface in contact with the bath is reduced from 10% to 30% compared to the surface of the complete blade.
  • a first solution consists in making the rotor by machining in one block. Disc, blades and central hub make up a single unit. Another solution is to make the rotor in two parts: on the one hand the disc with, in its center, its own thread fixing hub to the drive shaft, on the other hand all of the blades with its central hub. The rotor is then obtained by successive adjustments of the disc and blades on the drive shaft.
  • the advantage of a two-piece assembly is that the rotor can be made of different materials. For example, the blades which are subjected to greater stresses than the disc, can be made of a material harder than the disc.
  • the device according to the invention can be produced in all materials compatible with the conditions of use (mechanical resistance held at high temperature, wear, etc.) and in particular with all the materials already known for be used in similar equipment (graphite, boron nitride, alumina, silicon nitride, ceramics from the SIALON family, etc.).
  • the three parts can possibly be made of different materials.
  • the gas injection ports are drilled radially in the central hub on which the blades are fixed. The connection of these ports on the arrival of gas via the drive shaft will be discussed later.
  • the gas injection ports are positioned and constructed in such a way that the gas jet is generally located at the height of the central zone of the blade which, during the rotation, will disperse it.
  • Figure 1 shows in section the diagram of a conventional tank of continuous processing of liquid aluminum with a rotary device gas injection.
  • Figure 2 shows a rotary gas injection device of the prior art.
  • Figure 3a shows a rotary gas injection device with 8 identical blades.
  • Figure 3b shows a rotary gas injection device according to the invention alternating full blades and reduced surface blades.
  • Figure 4 shows two possible variants (4a and 4b) for assembly different elements of a device according to the invention and for feeding injection ports.
  • the rotor according to the invention comprises an injection of gas between each blade by a single orifice which is positioned vertically halfway up the blade, which is oriented radially in such a way that its axis roughly corresponds to the bisector of the angle formed by the two blades and which is drilled along a horizontal axis.
  • a rotor of this type is shown FIG. 3a in which the drive shaft (1) is distinguished, the upper disc (4), the blades (5) and a gas injection orifice (10).
  • the diameter of the orifices is between 1 and 5 mm. Below 1 mm in diameter, there is a risk of blockage. Above 5 mm. the diameter of the bubbles becomes too large, the exchange surface metal / gas decreases and the effectiveness of the treatment may be compromised. In certain configurations, depending on the volume to be treated, the size of the rotor and of its speed, of the volume of gas to be dispersed, it may be advantageous to replace the single orifice located between the blades with two or more smaller diameter.
  • the holes thus described, drilled in a star in the central hub of the rotor, can be connected to the gas supply through the hollow shaft training by all kinds of means. These means depend on choices also made for the mechanical arrangement of the rotor and the shaft, in depending on the materials, the size of the rotor, etc. These different means possible which can be very numerous are compatible with the invention as long as they provide a sufficiently regular and good gas flow distributed in the different orifices.
  • a drive shaft (1) has at its lower end a threaded cylindrical hole (2) which will be the female part of a screw connection.
  • the rotor itself (3) manufactured in one piece has an upper disc (4), a number of blades (5) and a cylindrical central core (6).
  • This central core (6), full in its part lower (6a) has a cylindrical cavity (7a) which plays the role of gas distributor. From this cavity, the holes are drilled radially (10) which diffuse the gas between the blades.
  • a cylindrical threaded hole (8) with a diameter identical to that of the threaded cylindrical hole (2) of the drive shaft, intended also to serve as female part for screw connection, opens into the central gas distribution cavity.
  • the whole comprises a screw (9) of cylindrical shape and pierced in its center with a channel gas passage.
  • FIG. 4b Another solution for rotor / shaft assembly and gas distribution is shown in Figure 4b.
  • the drive shaft (1) has a hole cylindrical threaded (2) which will be the female part of the screw connection.
  • the rotor is in two parts: the upper disc (4) is manufactured separately and joined to the assembly constituted by the blades and the central core during assembly only.
  • the upper disc (4) has on its lower face grooves (4a) intended to receive the upper part of the blades at the time of mounting.
  • the center of the disc is drilled with a threaded cylindrical hole intended to receive the connecting screw.
  • the central core (6) of the rotor proper is drilled with a threaded cylindrical hole (8) intended to receive the screw connection.
  • the assembly includes a screw (9) pierced in its center with a channel gas passage. This channel which, at the top of the screw, is will connect to the drive shaft channel, ends at the party lower into a series of small radial channels which, once assembled, will open into the gas distribution chamber.
  • the screw (9) is introduced at the bottom of the central core. Thanks to the parties threaded from the upper part of the central core, the disc and the lower of the drive shaft, the screw (9) assembles the three rooms.
  • the rotor according to the invention comprises an even number of blades, blades "Complete” alternating with blades whose surface in contact with the bath is reduced from 10% to 30% compared to the surface of the complete blade.
  • the reduction in surface area of one blade in two at the bottom can be performed in several ways, depending, among other things, on the chosen form for the "complete” blade. We can for example rotate blades Rectangular “complete” with reduced surface blades where we have simply decreased the height of the rectangle. We can also do alternate rectangular blades with trapezoidal blades of the same height at the hub but lower height at the blade end.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Claims (4)

  1. Rotierende Vorrichtung zur Gasdispersion für die kontinuierliche Behandlung eines Aluminiumschmelzbades in einem Behandlungsbehälter mit einer als Gaszufuhr dienenden Antriebswelle und einem Rotor, welcher Rotor aus einer geraden Zahl sternförmig um eine Zentralnabe herum angeordneter Rotorblätter und einer im wesentlichen flachen Scheibe besteht, die den von den Blättern gebildeten Stern bedeckt, wobei das Gas über Öffnungen zwischen den Blättern in das Bad eingespritzt wird und das Verhältnis Außendurchmesser des Rotors zu Durchmesser seiner Zentralnabe im Bereich von 1,5 und 4 liegt, dadurch gekennzeichnet, daß sich ganze Blätter mit einer vorgegebenen Kontaktfläche mit dem Bad und reduzierte Blätter mit einer um 10 bis 30 % kleineren Kontaktfläche mit dem Bad bezogen auf die Kontaktfläche der ganzen Blätter abwechseln.
  2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß die Zahl der Blätter zwischen 6 und 8 liegt.
  3. Vorrichtung nach einem der Ansprüche 1 oder 2, dadurch gekennzeichnet, daß die Gaseinspritzöffnungen in vertikaler Richtung etwa auf halber Höhe des Blattes positioniert sind, etwa horizontal gebohrt sind und ihre Achse im wesentlichen der Winkelhalbierenden des durch die beiden Blätter gebildeten Winkels entspricht
  4. Vorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß der Durchmesser der Öffnungen 1 bis 5 mm beträgt.
EP97935603A 1996-08-02 1997-07-23 Rührer zum einbringen von gas bei der behandlung eines aluminiumbades Expired - Lifetime EP0916066B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9609975 1996-08-02
FR9609975 1996-08-02
PCT/FR1997/001367 WO1998005915A1 (fr) 1996-08-02 1997-07-23 Dispositif rotatif de dispersion de gaz pour le traitement d'un bain d'aluminium liquide

Publications (2)

Publication Number Publication Date
EP0916066A1 EP0916066A1 (de) 1999-05-19
EP0916066B1 true EP0916066B1 (de) 1999-12-15

Family

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Family Applications (1)

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EP97935603A Expired - Lifetime EP0916066B1 (de) 1996-08-02 1997-07-23 Rührer zum einbringen von gas bei der behandlung eines aluminiumbades

Country Status (6)

Country Link
US (1) US6060013A (de)
EP (1) EP0916066B1 (de)
AU (1) AU714284B2 (de)
CA (1) CA2251230C (de)
DE (2) DE916066T1 (de)
WO (1) WO1998005915A1 (de)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2001293540B2 (en) * 2000-09-12 2006-06-29 Alcan International Limited Process and rotary device for adding particulate solid material and gas to molten metal bath
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
US6602318B2 (en) * 2001-01-22 2003-08-05 Alcan International Limited Process and apparatus for cleaning and purifying molten aluminum
WO2004029307A1 (de) * 2002-09-19 2004-04-08 Hoesch Metallurgie Gmbh Rotor, vorrichtung und ein verfahren zum einbringen von fluiden in eine metallschmelze
DE10301561A1 (de) * 2002-09-19 2004-05-27 Hoesch Metallurgie Gmbh Rotor, Vorrichtung und Verfahren zum Einbringen von Fluiden in eine Metallschmelze
GB2396310A (en) * 2002-12-21 2004-06-23 Foseco Int Rotary device with vanes for dispersing a gas in a molten metal
JP5575933B2 (ja) * 2013-01-18 2014-08-20 昭和電工株式会社 アルミニウム溶湯処理装置
USD742427S1 (en) 2013-09-27 2015-11-03 Rio Tinto Alcan International Limited Impeller for a rotary injector
BR112016006329A2 (pt) 2013-09-27 2017-08-01 Rio Tinto Alcan Int Ltd dispositivo de impulsão de dupla função para um injetor giratório
CN105420510A (zh) * 2015-12-08 2016-03-23 西南铝业（集团）有限责任公司 一种熔体精炼装置
CN118103658A (zh) * 2023-08-17 2024-05-28 浙江海亮股份有限公司 带有搅拌装置的金属熔炉

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3227547A (en) * 1961-11-24 1966-01-04 Union Carbide Corp Degassing molten metals
US3411759A (en) * 1964-08-14 1968-11-19 Aluminum Lab Ltd Apparatus for splashing liquids
CH583781A5 (de) * 1972-12-07 1977-01-14 Feichtinger Heinrich Sen
JPS581025A (ja) * 1981-05-27 1983-01-06 Sumitomo Light Metal Ind Ltd 溶融金属の処理装置
FR2512067B1 (fr) * 1981-08-28 1986-02-07 Pechiney Aluminium Dispositif rotatif de dispersion de gaz pour le traitement d'un bain de metal liquide
CA1305609C (en) * 1988-06-14 1992-07-28 Peter D. Waite Treatment of molten light metals
FR2656001A1 (fr) * 1989-12-18 1991-06-21 Pechiney Recherche Procede et dispositif d'elaboration de produits composites a matrice metallique.
US5364078A (en) * 1991-02-19 1994-11-15 Praxair Technology, Inc. Gas dispersion apparatus for molten aluminum refining
US5160693A (en) * 1991-09-26 1992-11-03 Eckert Charles E Impeller for treating molten metals
CA2073706A1 (en) * 1992-07-13 1994-01-14 Cesur Celik Apparatus and process for the refinement of molten metal

Also Published As

Publication number Publication date
DE69700963T2 (de) 2000-06-08
CA2251230A1 (fr) 1998-02-12
DE916066T1 (de) 1999-10-21
WO1998005915A1 (fr) 1998-02-12
DE69700963D1 (de) 2000-01-20
EP0916066A1 (de) 1999-05-19
US6060013A (en) 2000-05-09
AU714284B2 (en) 1999-12-23
AU3853397A (en) 1998-02-25
CA2251230C (fr) 2002-07-09

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