EP2739927B2 - Vorrichtung zum raffinieren von metallschmelzen - Google Patents

Vorrichtung zum raffinieren von metallschmelzen Download PDF

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Publication number
EP2739927B2
EP2739927B2 EP13742381.0A EP13742381A EP2739927B2 EP 2739927 B2 EP2739927 B2 EP 2739927B2 EP 13742381 A EP13742381 A EP 13742381A EP 2739927 B2 EP2739927 B2 EP 2739927B2
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EP
European Patent Office
Prior art keywords
rotor
partitions
radial
melt
ribs
Prior art date
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Active
Application number
EP13742381.0A
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German (de)
English (en)
French (fr)
Other versions
EP2739927B1 (de
EP2739927A1 (de
Inventor
Ivona JANICZKOVÁ
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.)
Jap Industries Sro
Original Assignee
Jap Industries SRO
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Publication date
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Application filed by Jap Industries SRO filed Critical Jap Industries SRO
Priority to PL13742381T priority Critical patent/PL2739927T5/pl
Publication of EP2739927A1 publication Critical patent/EP2739927A1/de
Publication of EP2739927B1 publication Critical patent/EP2739927B1/de
Application granted granted Critical
Publication of EP2739927B2 publication Critical patent/EP2739927B2/de
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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 invention relates to a rotary device for refining metal melts, which has a cylindrical rotor fastened to a hollow shaft, which is formed by two parallel disks connected to radial partitions, and which has a central cavity which is open at the bottom and at the top with a feed bore in the shaft is connected, with channels extending from the cavity, which are separated by partitions and wider in the radial direction.
  • Melted non-ferrous metals such as aluminum and its alloys must be refined prior to casting, i.e. freed from gases and non-metallic debris.
  • aluminum it is particularly hydrogen and calcium.
  • the hydrogen solubility in an aluminum melt increases with temperature, while it is very low in the solid phase.
  • the gas and solid particles that are scattered in the melt can result in pores in the casting and thereby a deterioration in its mechanical properties.
  • the refining of the molten metal is usually carried out by means of a rotary device which creates a vortex in the melt and supplies the melt with dry inert gas such as argon, nitrogen or a mixture thereof, along with reactive mixtures of salts.
  • dry inert gas such as argon, nitrogen or a mixture thereof
  • the gas enters the rotor through the hollow shaft, which disperses the gas in the form of fine bubbles into the melt at the bottom of the melting vessel.
  • the bubbles penetrate the melt, the hydrogen diffuses into the bubbles, rises with them to the surface and escapes into the atmosphere.
  • the vesicles bind solid debris and take them with them to the surface, where they are collected as slag.
  • the rotor is formed by two parallel disks, between which there are radial channels separated by partitions.
  • the rotor has a central chamber which is open at the bottom and which is connected to a bore in the shaft and to the radial channels of the rotor.
  • Rotation device formed by a hollow shaft to which a rotor in the form of two disks lying on top of one another and connected by four radial partition walls is attached.
  • the rotor has a central chamber which is open at the bottom and which is connected on the one hand to the bore in the shaft and on the other hand to widening channels between the partition walls.
  • Semicircular recesses on the circumference of the upper disk represent a new element here. There are eight recesses, ie two for each channel. These recesses are intended to improve the dispersion of the gas in the melt.
  • the degassing device according to the EP 2017560 differs from the latter essentially in that the same recesses are made in the upper and in the lower disk of the rotor.
  • One of the versions of the U.S. 6,589,313 described rotor differs from the rotor according to the EP0332292 in that the rotor is provided with radial ribs on the upper side, but these have no influence on the movement of the melt under the rotor.
  • the rotor after the U.S. 6,056,803 has an upper conical part and a lower cylindrical part in which there is a central cavity. Radial channels open on the lower side extend from this cavity. The gas is fed directly into the channels through small bores.
  • DE 1 0301 561 describes a rotor head for refining the molten metal, which has a central cavity at the bottom into which gas is fed. On the lower side of the rotor there are radial grooves that have a concave shape.
  • a rotary device for refining metal melts which has a cylindrical rotor fastened to a hollow shaft, which is formed by two parallel disks connected to radial partitions, and one of which is open at the bottom and connected to a feed bore in the shaft at the top Having central cavity, the central cavity extending from channels which are separated by the partition walls and wider in the radial direction.
  • the rotor according to the invention is provided with radial blades on the lower side.
  • the blades are advantageously arcuate, with their convex side oriented in the direction of rotation.
  • joints are formed which connect the respective channel to the lower side of the rotor.
  • the joints are advantageously guided along the convex flanks of the blade.
  • the circumference of the rotor is provided according to the invention with longitudinal ribs which adjoin the partition walls.
  • the length of the longitudinal ribs preferably corresponds to the height of the partition walls.
  • the length of the longitudinal ribs can correspond to the height of the rotor, the ribs merging into the blade at the lower end.
  • the partition walls are provided with projections which protrude into the cavity.
  • the device for refining molten metal according to Fig. 1 is formed by a cylindrical rotor 1 which is screwed to a shaft 2 provided with a bore intended for gas supply.
  • the rotor 1 is formed by two parallel disks 3, 4 which are connected by radial partition walls 5 .
  • the rotor 1 has a central cavity 6 which is open at the bottom and is connected to the bore in the shaft 2 at the top. Between the disks 3, 4 there are channels 7 separated by the partition walls 5 , which extend from the cavity 6 and become wider in the radial direction.
  • radial arc-shaped blades 8 are attached, which are directed with their convex side in the direction of rotation, that is, are bent in the direction of rotation.
  • the direction of rotation is marked with an arrow.
  • the number of blades 8 corresponds to the number of partition walls 5.
  • the blades 8 lie under the partition walls 5.
  • the partition walls 5 on the lateral surface of the rotor 1 merge into longitudinal ribs 9 , the length l of which corresponds to the height of the partition walls 5 , see FIG. Fig. 3 , or whose length l corresponds to the height of the rotor 1 , s. Fig. 4 and 5 .
  • the longitudinal ribs 9 merge into the blades 8 at their lower end.
  • the cross section of the blades 8 is essentially rectangular.
  • the partition walls 5 When running after Fig. 6 the partition walls 5 are provided with projections 11 which protrude into the cavity 6.
  • the cavity 6 here has a slightly larger diameter in comparison with the preceding explanations.
  • the inert gas with the scattered reactive salts is blown through the bore of the shaft 2 into the cavity 6 of the rotor 1 immersed in the melt.
  • the rotor 1 works in a similar way to the rotor of a radial pump, ie it sucks the melt from below into the cavity 6, and as a result of the centrifugal force it hurls it into the environment.
  • the melt is mixed with the gas in the cavity 6 , fine bubbles are formed which, together with the melt, are dispersed over the entire profile of the melting vessel. This effect is reinforced by the ribs 9.
  • the radial blades 8 on the lower side of the rotor 1 cause the melt to swirl under the rotor 1 and lead to a toroidal vortex, in the distal part of which the melt sinks and in the proximal part of which it rises.
  • the impurities that collect on the bottom of the melting vessel are whirled up to the level of the bubbles, and then they are carried to the surface by them.
  • the advances 11 protruding into the cavity 6 mix the gas fed into the cavity 6 with the melt and thereby support the generation of the bubbles.
  • the rotors described here also have a better distribution of the speeds in the horizontal planes at the same speed.
  • the maximum velocities of the melt at the outlet from the channels of the rotor are given as V1 max and 10 mm below the rotor as V2 max .
  • the rotor according to the invention according to the variant Fig. 3 with a diameter of 190 mm was tested at a speed of 500 1 / min in a foundry when refining aluminum melt during the casting of pistons. Refining here is done in a common way, first with nitrogen, then with chlorine, and finally reactive salt mixtures are added. The calcium content in the melt is determined. Refining stops when the calcium level approaches zero. When using the rotor after the WO 2004/057045 The calcium level decreased to 3 ppm after 3 minutes and refining had to be continued for an additional 1.5 minutes. When using the rotor according to the invention, the calcium content fell below 1 ppm after 3 minutes.
  • the use of the rotor according to the invention in this foundry also showed that this rotor has a more favorable effect on the composition and consistency of the slag.
  • a pulpy slag regularly arose which contained up to 50 kg of aluminum per batch.
  • fine dust-like slag was produced which contained only 20 kg of aluminum per batch. This fact is due to better mixing and cleaning of the slag in the whole volume of the melting vessel.

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)
EP13742381.0A 2012-07-02 2013-06-26 Vorrichtung zum raffinieren von metallschmelzen Active EP2739927B2 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL13742381T PL2739927T5 (pl) 2012-07-02 2013-06-26 Urządzenie do oczyszczania ciekłych metali

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CZ20120446A CZ2012446A3 (cs) 2012-07-02 2012-07-02 Rotacní zarízení k rafinaci kovové taveniny
PCT/CZ2013/000078 WO2014005560A1 (de) 2012-07-02 2013-06-26 Vorrichtung zum raffinieren von metallschmelzen

Publications (3)

Publication Number Publication Date
EP2739927A1 EP2739927A1 (de) 2014-06-11
EP2739927B1 EP2739927B1 (de) 2015-10-07
EP2739927B2 true EP2739927B2 (de) 2021-09-01

Family

ID=48900719

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13742381.0A Active EP2739927B2 (de) 2012-07-02 2013-06-26 Vorrichtung zum raffinieren von metallschmelzen

Country Status (5)

Country Link
EP (1) EP2739927B2 (cs)
CZ (1) CZ2012446A3 (cs)
DE (1) DE202013102823U1 (cs)
PL (1) PL2739927T5 (cs)
WO (1) WO2014005560A1 (cs)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CZ2012446A3 (cs) * 2012-07-02 2013-08-28 Jap Trading, S. R. O. Rotacní zarízení k rafinaci kovové taveniny
CN107519780B (zh) * 2016-06-21 2023-05-19 上海弗鲁克科技发展有限公司 高效化糖设备及其转子
WO2023046701A1 (en) * 2021-09-21 2023-03-30 Foseco International Limited Rotary device for treating molten metal
WO2024062216A1 (en) 2022-09-23 2024-03-28 Foseco International Limited Rotary device for treating molten metal

Family Cites Families (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8804267D0 (en) * 1988-02-24 1988-03-23 Foseco Int Treating molten metal
CA1305609C (en) 1988-06-14 1992-07-28 Peter D. Waite Treatment of molten light metals
US5160693A (en) * 1991-09-26 1992-11-03 Eckert Charles E Impeller for treating molten metals
US5527381A (en) 1994-02-04 1996-06-18 Alcan International Limited Gas treatment of molten metals
US6056803A (en) * 1997-12-24 2000-05-02 Alcan International Limited Injector for gas treatment of molten metals
ES2239680T3 (es) * 2000-09-12 2005-10-01 Alcan International Limited Proceso y dispositivo rotatorio para añadir un material solido en particulas y gas a un baño de metal fundido.
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
FR2851578B1 (fr) * 2003-02-25 2007-03-02 Lethiguel Dispositif de purification par degazage d'un metal liquide
US8178036B2 (en) * 2006-07-13 2012-05-15 Pyrotek, Inc. Impeller for dispersing gas into molten metal
JP2008105084A (ja) * 2006-10-27 2008-05-08 Kyocera Corp 溶湯金属攪拌用回転体およびこれを用いた溶湯金属の脱ガス処理装置
PL2017560T3 (pl) * 2007-07-05 2010-05-31 Foseco Int Obrotowe urządzenie mieszające do obróbki stopionego metalu
US8535603B2 (en) * 2009-08-07 2013-09-17 Paul V. Cooper Rotary degasser and rotor therefor
US8524146B2 (en) * 2009-08-07 2013-09-03 Paul V. Cooper Rotary degassers and components therefor
PL2591235T3 (pl) 2010-07-02 2020-04-30 Pyrotek Inc. Wirnik roztopionego metalu
PT105293A (pt) 2010-09-16 2012-03-16 Sounete Fabrica De Aprestos Metalicos Lda Contentor autónomo com sistema de compactação de resíduos sólidos
CZ2012446A3 (cs) * 2012-07-02 2013-08-28 Jap Trading, S. R. O. Rotacní zarízení k rafinaci kovové taveniny

Also Published As

Publication number Publication date
CZ304029B6 (cs) 2013-08-28
WO2014005560A1 (de) 2014-01-09
EP2739927B1 (de) 2015-10-07
EP2739927A1 (de) 2014-06-11
PL2739927T5 (pl) 2022-01-31
DE202013102823U1 (de) 2013-08-14
CZ2012446A3 (cs) 2013-08-28
PL2739927T3 (pl) 2016-04-29

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