EP0419378A1 - Begasungsvorrichtung für ein stationäres Aluminium-Schmelzbad mit grosser Oberfläche - Google Patents

Begasungsvorrichtung für ein stationäres Aluminium-Schmelzbad mit grosser Oberfläche Download PDF

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Publication number
EP0419378A1
EP0419378A1 EP90420406A EP90420406A EP0419378A1 EP 0419378 A1 EP0419378 A1 EP 0419378A1 EP 90420406 A EP90420406 A EP 90420406A EP 90420406 A EP90420406 A EP 90420406A EP 0419378 A1 EP0419378 A1 EP 0419378A1
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EP
European Patent Office
Prior art keywords
bath
rotor
gas
oven
furnace
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.)
Granted
Application number
EP90420406A
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English (en)
French (fr)
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EP0419378B1 (de
Inventor
Olivier Baud
Franck Boeuf
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.)
Constellium Issoire SAS
Original Assignee
Pechiney Rhenalu SAS
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Publication date
Application filed by Pechiney Rhenalu SAS filed Critical Pechiney Rhenalu SAS
Priority to AT90420406T priority Critical patent/ATE103992T1/de
Publication of EP0419378A1 publication Critical patent/EP0419378A1/de
Application granted granted Critical
Publication of EP0419378B1 publication Critical patent/EP0419378B1/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
    • 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
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/16—Introducing a fluid jet or current into the charge

Definitions

  • the present invention relates to a device for treatment by means of gas from a large surface aluminum liquid bath maintained in the stationary state in an oven.
  • aluminum is understood to mean both aluminum containing the usual impurities at rates which are a function of the quality treated, and the various alloys that this element is capable of forming.
  • the word gas refers to both simple elements such as nitrogen, argon and chlorine, for example, as well as their mixtures.
  • impurities are mainly constituted by hydrogen and metallic oxides such as alumina which come mainly from the pollution of the metal by the humidity of the environment to which other bodies and in particular other metals can be added, like magnesium for example, when aluminum comes from the remelting of waste.
  • impurities will either form inclusions and cause defects in the cast products, or give them unwanted mechanical characteristics. It is therefore essential to treat the aluminum to rid it of these impurities before pouring it.
  • This treatment generally consists in introducing into the liquid metal bath, possibly in the presence of a flux, one or more reactive and / or inert gases, the former having the function of reacting with certain impurities, such as magnesium for example, the latter causing the impurities present initially or formed during the reactions towards the surface of the bath where they can be separated by skimming and filtration.
  • This treatment can be carried out in ovens, whether it be alloy development ovens, holding ovens where the metal is in a stationary state and / or in pockets in which the metal flows continuously towards the stations of casting.
  • ovens almost always have a volume and a bath surface which are more than ten times greater. to those of the pockets and their height is also much greater.
  • rotary injectors are generally made of graphite, the only material capable of withstanding the abrasive action of the metal and the corrosive effect of chlorine at temperatures close to 800 ° C; but graphite is relatively fragile.
  • a treatment device using gas from a bath (2) of liquid aluminum at rest in an oven (28) where it occupies an area at least equal to 10 m2 including a gantry (21) removable placed above the oven and to which is suspended a set (1) of gas injection and bath stirring which partially plunges into the bath via an opening (3) which is formed in the vault (4) of the oven, said assembly comprising a rotary shaft (5) pierced along its axis by a cavity (6) closed downwards and opening above the oven in (7), said shaft being equipped at its upper part with '' a motor (17) and at its lower part of a rotor (9) provided with blades (10) pierced with channels (11) connected to the cavity, characterized in that at the gantry are suspended at least three sets of length greater than 2 meters, of vertical axis of symmetry which taken two by two are located in different planes, the submerged parts of which are separated from each other only by the bath and that each of the trees is surrounded by a stator (13) extending downwards
  • the device according to the invention applies not to pockets of restricted surface where most often the metal circulates, but to ovens where the bath is stationary and occupies an area at least equal to 10 m2.
  • ovens are generally closed on the top and their vault is pierced with suitable openings through which the sets are introduced.
  • a removable gantry a kind of metal frame which allows, by different mechanical means (pulleys, wheels, jacks, etc.) to move them horizontally from a waiting position to above the openings, simultaneously bring them down into the bath and remove them after treatment of the metal.
  • Each of the assemblies is connected to a motor intended to ensure the rotation of the injector and communicates by flexible tubes to the gas inlets. The movements of the gantry, the rotation speed of the motors and the adjustment of the gas flow rates are controlled from a cockpit which simultaneously manages the entire operating chain of the oven.
  • the assemblies From the position point of view, the assemblies have their axes located two by two in different planes so as to obtain an offset and to avoid any alignment of more than two assemblies.
  • the results of tests carried out with and without offset show that the liquid-gas exchange is better in the offset position.
  • the gas injectors are constituted by a rotary shaft connected at its upper end to a drive motor and at its lower end to a rotor, a kind of disc provided on its side wall with blades.
  • the shaft is pierced along its axis by a cavity which opens on its wall above the furnace and which is closed down and connected to channels which pass through the blades to open into the bath through the face not adjacent to the rotor. This cavity and these channels serve for the distribution of the gas in the bath.
  • stator which extends upwards above the furnace where it is fixed and downwards near the upper face of the rotor where it forms a relatively narrow space of a few millimeters so that the layer of metal therein acts as a hydrodynamic bearing for the rotor and facilitates the rotation of the latter.
  • the lateral space which separates the stator from the rotor is filled with metal during the treatment and plays a damping role so that any "whip" effect on the rotor axis and any risk of breakage are eliminated.
  • the measurement of this space is preferably between 10 and 30 mm.
  • the injectors all rotate in the same direction to avoid eddies liable to hinder the rise of impurities on the surface.
  • the axes With identical rotors, which is the most general case, it is preferable to place the axes at equal distances between them. These distances can vary between 2 and 6 times the value of the diameter of the rotors, which is generally between 100 and 500 mm in order to be within a range ensuring at the same time a suitable dimension so as not to excessively multiply the number of injectors and compatible with the mechanical strength of trees.
  • the range of rotational speeds enabling good dispersion to be obtained without resorting to excessive torques is between 150 and 600 revolutions / minute.
  • the gas flow rate it is preferably between 6 and 12 m3 / h per injector, a lower flow unnecessarily lengthening the duration of the treatment and a higher flow resulting in the formation of too large bubbles which open on the surface of the bath without reacting.
  • This gas is preferably distributed by four blades located in planes forming an angle between 3 and 10 degrees relative to the vertical, symmetrically distributed around the rotor and drilled horizontally throughout their width by a channel of diameter from 1 to 3 mm approximately which is connected on one side to the shaft cavity and which opens on the other side at the end of the blade.
  • the rotor is preferably placed at a distance from the bottom of the oven between 1/4 and the 1/2 the height of the bath.
  • the stator is preferably extended up to a distance from the upper face of the rotor of between 10 and 50 mm.
  • the device according to the invention has the following advantages: - very reduced air pollution and therefore improvement of staff working conditions - improvement in the metallurgical quality of the metal due to greater processing efficiency - reduction in the duration of treatment - reduction of gas consumption - reduction in metal loss - increased productivity of the ovens - good mechanical strength of the assemblies.
  • FIG. 1 there is a gas injector assembly 1 which partially plunges into the bath 2 via an opening 3 formed in the roof 4 of the oven.
  • This assembly comprises a rotary shaft 5 pierced along its axis by a cavity 6 opening below the furnace at 7 through which the next gas is brought 8.
  • the shaft 5 is equipped at its lower part with a rotor 9 provided with blades 10 each pierced at their end by a channel 11 connected to the cavity 6 and which injects the gas into the next bath 12.
  • the shaft 5 is surrounded by a stator 13 so as to leave a space 14 into which the bath enters.
  • This stator extends downwards to a small distance from the face upper rotor to allow the bath to form an annular zone 15 acting as a hydrodynamic bearing; upwards the stator passes through the roof of the furnace to which it is suspended by a collar 16.
  • the motor 17 ensures the rotation of the rotor via the shaft.
  • FIG. 2 one can see a gantry 21 which rests on rails 22 by means of four wheels 23.
  • This gantry is formed by an upper frame 24 to which the axes of the wheels are fixed, by four vertical uprights 25 and of the lower frame 26 removable along the uprights by means of a jack 27. From this lower frame are suspended the four gas injector assemblies 1 which plunge into the bath of the metal to be treated 2 contained in the furnace 28 according to offset positions the one in relation to the other.
  • the gantry being in the waiting position A, and the lower frame in the high position, it is brought into position B located above the oven, then the lower frame is lowered to the intermediate position C where the elements are preheated before reaching position D where the elements are immersed in the bath. At this time, the injector engines are started and the gas is sent to the blades.
  • the lower frame is gradually raised so as to drain the bath contained in the rotor-stator space. This frame being in high position B is then brought back to position A.
  • the operating conditions were as follows: - distance from the bottom of the rotors to the bottom of the oven: 0.20 m - rotation speed 260 rpm - gas used: 95% by volume of argon and 5% of chlorine - gas flow: 10 m3 / h per injector - quantity of chlorine introduced: 0.06 kg / tonne - duration: 20 min.
  • a sample of metal thus treated was subjected to the telegas analysis method to determine the hydrogen content.
  • the amount found was 0.10 ⁇ g / g of metal.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Chemical Treatment Of Metals (AREA)
  • Coating With Molten Metal (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • ing And Chemical Polishing (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
  • Treating Waste Gases (AREA)
  • Gas Separation By Absorption (AREA)
  • Vertical, Hearth, Or Arc Furnaces (AREA)
EP90420406A 1989-09-20 1990-09-17 Begasungsvorrichtung für ein stationäres Aluminium-Schmelzbad mit grosser Oberfläche Expired - Lifetime EP0419378B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT90420406T ATE103992T1 (de) 1989-09-20 1990-09-17 Begasungsvorrichtung fuer ein stationaeres aluminium-schmelzbad mit grosser oberflaeche.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8912540A FR2652018B1 (fr) 1989-09-20 1989-09-20 Dispositif de traitement au moyen de gaz d'un bain liquide d'aluminium de grande surface maintenu a l'etat stationnaire dans un four.
FR8912540 1989-09-20

Publications (2)

Publication Number Publication Date
EP0419378A1 true EP0419378A1 (de) 1991-03-27
EP0419378B1 EP0419378B1 (de) 1994-04-06

Family

ID=9385802

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90420406A Expired - Lifetime EP0419378B1 (de) 1989-09-20 1990-09-17 Begasungsvorrichtung für ein stationäres Aluminium-Schmelzbad mit grosser Oberfläche

Country Status (9)

Country Link
US (1) US5028035A (de)
EP (1) EP0419378B1 (de)
AT (1) ATE103992T1 (de)
AU (1) AU621531B2 (de)
CA (1) CA2023753C (de)
DE (1) DE69007921T2 (de)
ES (1) ES2050989T3 (de)
FR (1) FR2652018B1 (de)
NO (1) NO176925C (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2261033A (en) * 1991-09-26 1993-05-05 Charles Edward Eckert Impeller for treating molten metals.

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2645456B1 (fr) * 1989-04-11 1994-02-11 Air Liquide Procede et installation de traitement d'un liquide avec un gaz
US6056803A (en) * 1997-12-24 2000-05-02 Alcan International Limited Injector for gas treatment of molten metals
US9127332B2 (en) * 2008-03-11 2015-09-08 Pyrotek, Inc. Molten aluminum refining and gas dispersion system
CN110607461B (zh) * 2018-11-16 2023-05-09 柳州职业技术学院 一种铝合金精炼用长效复合式石墨搅拌装置及制备方法
CN117701893B (zh) * 2024-02-01 2024-04-26 北京航空航天大学 一种合金熔体旋转喷吹精炼装置及方法

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1635037A (en) * 1925-09-28 1927-07-05 Edwards John Means for agitating and stirring molten metal in open-hearth and like furnaces
US3227547A (en) * 1961-11-24 1966-01-04 Union Carbide Corp Degassing molten metals
US3743263A (en) * 1971-12-27 1973-07-03 Union Carbide Corp Apparatus for refining molten aluminum
US3870511A (en) * 1971-12-27 1975-03-11 Union Carbide Corp Process for refining molten aluminum
AT330470B (de) * 1974-07-17 1976-07-12 Vmw Ranshofen Berndorf Ag Begasungsvorrichtung fur metallurgische gefasse, insbesondere schmelzofen
AT336900B (de) * 1974-04-04 1977-05-25 Vmw Ranshofen Berndorf Ag Vorrichtung zur einbringung von gasen in flussigkeiten, insbesondere schmelzen
US4327901A (en) * 1980-03-10 1982-05-04 Kaiser George S Melt and hold furnace for non-ferrous metals
EP0077282A1 (de) * 1981-10-14 1983-04-20 Aluminium Pechiney Vorrichtung zur durchlaufenden Behandlung von flüssigen Aluminium- oder Magnesiummetallen oder -metallegierungen
EP0245601A2 (de) * 1986-03-05 1987-11-19 Showa Aluminum Corporation Vorrichtung zum Behandeln von geschmolzenen Metallen

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3703340A (en) * 1970-10-09 1972-11-21 Us Reduction Co Mechanical puddler
US4203581A (en) * 1979-03-30 1980-05-20 Union Carbide Corporation Apparatus for refining molten aluminum
FR2568267B1 (fr) * 1984-07-27 1987-01-23 Pechiney Aluminium Poche de chloruration d'alliages d'aluminium destinee a eliminer le magnesium
JP2505525B2 (ja) * 1988-04-08 1996-06-12 三菱重工業株式会社 スラリ―の気液接触処理装置
US4884786A (en) * 1988-08-23 1989-12-05 Gillespie & Powers, Inc. Apparatus for generating a vortex in a melt
IL93349A0 (en) * 1989-02-17 1990-11-29 Carborundum Co Method and apparatus for injecting gas into molten metal

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1635037A (en) * 1925-09-28 1927-07-05 Edwards John Means for agitating and stirring molten metal in open-hearth and like furnaces
US3227547A (en) * 1961-11-24 1966-01-04 Union Carbide Corp Degassing molten metals
US3743263A (en) * 1971-12-27 1973-07-03 Union Carbide Corp Apparatus for refining molten aluminum
US3870511A (en) * 1971-12-27 1975-03-11 Union Carbide Corp Process for refining molten aluminum
AT336900B (de) * 1974-04-04 1977-05-25 Vmw Ranshofen Berndorf Ag Vorrichtung zur einbringung von gasen in flussigkeiten, insbesondere schmelzen
AT330470B (de) * 1974-07-17 1976-07-12 Vmw Ranshofen Berndorf Ag Begasungsvorrichtung fur metallurgische gefasse, insbesondere schmelzofen
US4327901A (en) * 1980-03-10 1982-05-04 Kaiser George S Melt and hold furnace for non-ferrous metals
EP0077282A1 (de) * 1981-10-14 1983-04-20 Aluminium Pechiney Vorrichtung zur durchlaufenden Behandlung von flüssigen Aluminium- oder Magnesiummetallen oder -metallegierungen
EP0245601A2 (de) * 1986-03-05 1987-11-19 Showa Aluminum Corporation Vorrichtung zum Behandeln von geschmolzenen Metallen

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2261033A (en) * 1991-09-26 1993-05-05 Charles Edward Eckert Impeller for treating molten metals.
US5314525A (en) * 1991-09-26 1994-05-24 Eckert Charles E Method for treating a liquid with a gas using an impeller
GB2261033B (en) * 1991-09-26 1996-05-15 Charles Edward Eckert Impeller for treating molten metals

Also Published As

Publication number Publication date
EP0419378B1 (de) 1994-04-06
ATE103992T1 (de) 1994-04-15
FR2652018A1 (fr) 1991-03-22
DE69007921T2 (de) 1994-10-06
NO903464D0 (no) 1990-08-07
DE69007921D1 (de) 1994-05-11
FR2652018B1 (fr) 1994-03-25
AU621531B2 (en) 1992-03-12
US5028035A (en) 1991-07-02
CA2023753A1 (fr) 1991-03-21
ES2050989T3 (es) 1994-06-01
NO176925B (no) 1995-03-13
NO176925C (no) 1995-06-21
NO903464L (no) 1991-03-21
AU6230390A (en) 1991-03-28
CA2023753C (fr) 1997-10-07

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