EP1190996A2 - Dispositif de pulveration - Google Patents

Dispositif de pulveration Download PDF

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Publication number
EP1190996A2
EP1190996A2 EP01890269A EP01890269A EP1190996A2 EP 1190996 A2 EP1190996 A2 EP 1190996A2 EP 01890269 A EP01890269 A EP 01890269A EP 01890269 A EP01890269 A EP 01890269A EP 1190996 A2 EP1190996 A2 EP 1190996A2
Authority
EP
European Patent Office
Prior art keywords
lance
immersion tube
outlet opening
melt
dip tube
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.)
Withdrawn
Application number
EP01890269A
Other languages
German (de)
English (en)
Other versions
EP1190996A3 (fr
Inventor
Alfred Dipl.-Ing. Edlinger
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.)
Tribovent Verfahrensentwicklung GmbH
Original Assignee
Tribovent Verfahrensentwicklung GmbH
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 Tribovent Verfahrensentwicklung GmbH filed Critical Tribovent Verfahrensentwicklung GmbH
Publication of EP1190996A2 publication Critical patent/EP1190996A2/fr
Publication of EP1190996A3 publication Critical patent/EP1190996A3/fr
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/02—Making metallic powder or suspensions thereof using physical processes
    • B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
    • B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
    • B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B3/00—General features in the manufacture of pig-iron
    • C21B3/04—Recovery of by-products, e.g. slag
    • C21B3/06—Treatment of liquid slag
    • C21B3/08—Cooling slag
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/02—Making metallic powder or suspensions thereof using physical processes
    • B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
    • B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
    • B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
    • B22F2009/0884—Spiral fluid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/02—Making metallic powder or suspensions thereof using physical processes
    • B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
    • B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
    • B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
    • B22F2009/0892—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid casting nozzle; controlling metal stream in or after the casting nozzle
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2400/00—Treatment of slags originating from iron or steel processes
    • C21B2400/02—Physical or chemical treatment of slags
    • C21B2400/022—Methods of cooling or quenching molten slag
    • C21B2400/024—Methods of cooling or quenching molten slag with the direct use of steam or liquid coolants, e.g. water
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B2400/00—Treatment of slags originating from iron or steel processes
    • C21B2400/05—Apparatus features
    • C21B2400/062—Jet nozzles or pressurised fluids for cooling, fragmenting or atomising slag

Definitions

  • the invention relates to a device for atomization of melts, in particular slag melts, with a Tundish, a cross-section that increases in the manner of a Laval nozzle Outlet opening for the melt and a dip tube, the lower edge of the outlet opening to form a Grips annular gap and one arranged in the interior of the dip tube Lance for a propellant.
  • Devices of the type mentioned above can be atomized and granulating slag and for spray atomization of metal melting are used, with particularly small Droplet sizes can be realized and at the same time in In the case of slag, rapid cooling and thus glazing the slag can be caused.
  • Slag melting can be a subsequent grinding of fine-grained solidified and glazed particles for use as hydraulic binders become unnecessary.
  • the dip tube forms an underflow weir, and it can by appropriate Setting the distance between the lower edge of the dip tube and the edge of the tundish outlet opening defined layer thickness can be set, which is the thickness of the jacket of the tubular melt beam, as it from the Exhaust opening emerges, defined.
  • the propellant fluid lance can be in known manner with steam propellant or liquids operated, being in the case of the use of steam corresponding geometry of the outlet opening of the lance and the like
  • Pressure the flow conditions set so can be that the propellant fluid at the speed of sound emerges from the blowing lance nozzle and subsequently in the area the outlet opening designed as a Laval nozzle rapidly expands, even supersonic speeds in this area can be achieved.
  • Flow conditions can also lead to pressure surges come in an underexpanded free jet, whereby an optimal shredding effect is naturally only guaranteed can be if a homogeneous thickness of the emerging Slag jet guaranteed in the area of the outlet opening can be. Due to the rapid cooling, was already proposed the area of the annular gap accordingly heat to prevent the bottom edge from growing and thus to prevent irregular coating thickness of the melt jet.
  • the invention now aims at very small-scale Set up a correspondingly small annular gap to be able to do a faster shredding and a enables faster glassy solidification of slags, whereby the selected annular gap width is exactly maintained at the same time can be.
  • Device according to the invention essentially in that the Dip tube with a drive for rotating movement around its Axis is connected.
  • the fact that the dip tube with a Drive is connected to the rotating movement about its axis, takes advantage of the thixotropic behavior Slag with additional shear and shear forces Significant liquefaction of the melt in the annular gap achieved, which results in a finer disintegration leaves.
  • the rotation of the dip tube turns on wear-related, even grinding in and thus one ensures constant annular gap height, making reproducible Results can be achieved over a long period of time.
  • the axial adjustability of the dip tube for setting the gap width of the annular gap and the corresponding adjustability of the propellant fluid lance can thus the optimal conditions for a quick and efficient Set disintegration and optimize within wide limits. This applies in particular to training courses where Propellant gas exits the fluid lance at the speed of sound and in the divergent Laval area of the tundish outlet opening accelerated to supersonic speed.
  • the training is advantageously made so that the lance in Inside of the dip tube, especially with the interposition of labyrinth seals, is leaking.
  • Labyrinth seal allows a corresponding sealing of the rotating dip tube opposite the propellant fluid lance, whereby at the same time the training is advantageously made such that the lance on its adjacent the nozzle for the propellant fluid Outer jacket at least one guide body or swirl body having.
  • Optimal conditions and particularly small-scale facilities can be achieved in that the nozzle mouth of the lance protrudes beyond the lower edge of the dip tube, although with advantage the rotating immersion tube and the propellant fluid lance are height adjustable are stored.
  • labyrinth seals is the extent of such height adjustability in narrow Limits to each other's height adjustment Component bound, with a defined relative adjustment the lance also a defined one relative to the rotating immersion tube Adjustment of the gap width of the labyrinth seal allows and allowed it in the way that sucked in Control the amount of false gas or false air.
  • the design according to the invention is such that the rotary drive of the dip tube is set to rotational speeds of 3 - 15 min -1 .
  • 1 is the bottom of a slag tundish referred to, wherein the liquid level of a liquid Slag or a melt 2 is indicated with 3.
  • a dip tube 4 which has a pinion 5 connected to a rotary drive formed by a motor 6 is.
  • a rotary drive of the dip tube 4 causes.
  • the area of Annular gap a between the lower edge of the dip tube 4 and the edge of the outlet opening 8 for the slag 4 shear forces due to the slow rotation of the dip tube introduced due to the thixotropic behavior of the Melt 2 to a significant liquefaction of the melt 2 contribute, creating an extremely thin-walled jet over the Opening 8 exits.
  • the outlet opening 8 is here kind of a Laval nozzle designed so that with supercritical Feeding a fluid formed an underexpanded jet can be.
  • the driving fluid is via a line 9 and a lance 10 is expelled through a nozzle 11, whereby at a supersonic speed in accordance with supercritical pressure conditions and therefore a high shear stress is achieved.
  • An additional baffle can be arranged which hinders a backflow.
  • Such a backflow A swirl body also acts efficiently in gases 12 on the outside of the propellant fluid lance 10.
  • the Lance 10 carries ring disks 13, which with corresponding Ring grooves or projections 14 on the inside of the rotatable Combed stored dip tube 4 and in this way a kind Form the labyrinth seal.
  • One in the direction of arrow 15 Intake of false gas is throttled in the way via the swirl body 12 in the area of the nozzle mouth, whereby at the same time a rotational acceleration is achieved and a backflow of gas is effectively countered.
  • the slag or melt solidifies relatively quickly after exiting from the slag outlet opening 8 due to the particularly fine-grain dispersion, so that it can be found with particularly small-sized devices.
  • Particularly advantageous conditions can be achieved by supplying propellant gas in the pressure range between 2 and 30 bar at temperatures between 20 ° and 1300 ° C via the lance 10, and rotating the immersion tube 4 at a speed of 3 to 15 min -1 becomes. Due to the uniform rotation and the liquefaction of the melt achieved in this way in the area of the annular gap a, a constant annular gap height can be maintained over a long period of time, as a result of which the corresponding disintegration conditions can be kept constant over a long period of time.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Furnace Charging Or Discharging (AREA)
EP01890269A 2000-09-20 2001-09-19 Dispositif de pulveration Withdrawn EP1190996A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT6932000 2000-09-20
AT6932000U 2000-09-20

Publications (2)

Publication Number Publication Date
EP1190996A2 true EP1190996A2 (fr) 2002-03-27
EP1190996A3 EP1190996A3 (fr) 2003-01-15

Family

ID=3497319

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01890269A Withdrawn EP1190996A3 (fr) 2000-09-20 2001-09-19 Dispositif de pulveration

Country Status (1)

Country Link
EP (1) EP1190996A3 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6660223B2 (en) * 2000-02-22 2003-12-09 Holcim Ltd. Device for atomizing liquid melts
EP1394131A2 (fr) * 2002-08-29 2004-03-03 Tribovent Verfahrensentwicklung GmbH Procédé et dispositif pour la granulation de matériaux en fusion
DE102015107876A1 (de) 2015-05-19 2016-11-24 Technische Universität Bergakademie Freiberg Vorrichtung und Verfahren zum Zerstäuben von Schmelzen

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3826598A (en) * 1971-11-26 1974-07-30 Nuclear Metals Inc Rotating gas jet apparatus for atomization of metal stream
US4659020A (en) * 1985-10-22 1987-04-21 The Babcock & Wilcox Company Quick adjustable shatter jet mechanism
US4905899A (en) * 1985-11-12 1990-03-06 Osprey Metals Limited Atomisation of metals
DE4019563A1 (de) * 1990-06-15 1991-12-19 Mannesmann Ag Verfahren zur herstellung von metallpulver
WO2000032306A1 (fr) * 1998-12-01 2000-06-08 Holderbank Financiere Glarus Ag Procede pour granuler des bains de laitier liquides, ainsi que dispositif pour la mise en oeuvre de ce procede

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3826598A (en) * 1971-11-26 1974-07-30 Nuclear Metals Inc Rotating gas jet apparatus for atomization of metal stream
US4659020A (en) * 1985-10-22 1987-04-21 The Babcock & Wilcox Company Quick adjustable shatter jet mechanism
US4905899A (en) * 1985-11-12 1990-03-06 Osprey Metals Limited Atomisation of metals
DE4019563A1 (de) * 1990-06-15 1991-12-19 Mannesmann Ag Verfahren zur herstellung von metallpulver
WO2000032306A1 (fr) * 1998-12-01 2000-06-08 Holderbank Financiere Glarus Ag Procede pour granuler des bains de laitier liquides, ainsi que dispositif pour la mise en oeuvre de ce procede

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6660223B2 (en) * 2000-02-22 2003-12-09 Holcim Ltd. Device for atomizing liquid melts
EP1394131A2 (fr) * 2002-08-29 2004-03-03 Tribovent Verfahrensentwicklung GmbH Procédé et dispositif pour la granulation de matériaux en fusion
EP1394131A3 (fr) * 2002-08-29 2007-01-17 Holcim Ltd. Procédé et dispositif pour la granulation de matériaux en fusion
DE102015107876A1 (de) 2015-05-19 2016-11-24 Technische Universität Bergakademie Freiberg Vorrichtung und Verfahren zum Zerstäuben von Schmelzen
WO2016184455A1 (fr) 2015-05-19 2016-11-24 Technische Universität Bergakademie Freiberg Dispositif et procédé de pulvérisation de matières fondues

Also Published As

Publication number Publication date
EP1190996A3 (fr) 2003-01-15

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