EP1241271A2 - Procédé de granulation de laitier - Google Patents

Procédé de granulation de laitier Download PDF

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Publication number
EP1241271A2
EP1241271A2 EP02450048A EP02450048A EP1241271A2 EP 1241271 A2 EP1241271 A2 EP 1241271A2 EP 02450048 A EP02450048 A EP 02450048A EP 02450048 A EP02450048 A EP 02450048A EP 1241271 A2 EP1241271 A2 EP 1241271A2
Authority
EP
European Patent Office
Prior art keywords
slag
air
impact mill
lance
rotor
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Withdrawn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
EP02450048A
Other languages
German (de)
English (en)
Other versions
EP1241271A3 (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
Priority claimed from AT0040301A external-priority patent/AT409969B/de
Application filed by Tribovent Verfahrensentwicklung GmbH filed Critical Tribovent Verfahrensentwicklung GmbH
Publication of EP1241271A2 publication Critical patent/EP1241271A2/fr
Publication of EP1241271A3 publication Critical patent/EP1241271A3/fr
Withdrawn legal-status Critical Current

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    • 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
    • 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
    • C21B2400/026—Methods of cooling or quenching molten slag using air, inert gases or removable conductive bodies
    • 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 process for granulating slags with a slag basicity CaO / SiO 2 of less than 1 and an Al 2 O 3 content of more than 6% by weight with a slag tundish and a propellant jet lance opening into the slag outlet, with a slag outlet Cooling room is connected, and a device particularly suitable for carrying out this method.
  • AT 407 247 has already proposed a melt ejecting from a melt tundish with fluid under pressure, where in particular pressurized gas, steam or pressurized water in Pressed in the direction of the slag outlet from the tundish has been.
  • the slag tundish outlet requires such Training special measures to prevent the Spout freezes, and it has therefore been proposed to height-adjustable weir pipe in the area of the slag outlet into the tundish to reduce the amount flowing out to be able to regulate, the propellant gas jet coaxial to Axis of the outlet opening was introduced and the tundish outlet opens directly into the refrigerator.
  • the atomizer head as a nozzle, in which coaxial the jet of a propellant gas lance opens, as a rule superheated steam can be used to overgrow the To prevent opening, depending on the composition of the Melt and especially with a higher iron oxide content Melt also places high demands on the refractory material become.
  • further training courses for example AT 406 954 B. remove, where the liquid slag in a below Expansion chamber under suction is sucked in and with a propellant jet is transported into the cooling zone.
  • AT 405 511 describes a process for granulating and comminuting described by molten material, in which liquid slag in free fall with pressurized water jets is applied, whereupon the solidified and granulated Slag together with the steam formed via a pneumatic Delivery line and a distributor is guided.
  • the material distributed in this way can be used immediately in a Jet mill to be further crushed.
  • the basic processes when granulating and crushing molten liquid Material by applying steam is also in EP 683 824 B1 already described, a mixing chamber being provided here is in which water, water vapor and / or air-water mixtures be injected, whereupon the evaporated water ejected through a diffuser together with the solidified material becomes.
  • the atomizer head is one of these Trained as a mixing chamber with subsequent diffuser, in this case, too, molten slag a corresponding storage vessel or a tundish can be.
  • the invention therefore aims to provide a method of the type mentioned for the defined slags, in which complex cleaning devices for steam and steam preparation can be dispensed with and at the same time it can be ensured that an increase in the use of an appropriate coolant The opening of the slag tundish is reliably prevented.
  • the method according to the invention essentially consists in that the propulsion jet lance is supplied with conveying air in the pressure range between 0.5 and 3 bar and that supplementary air is blown into the cooling space via the jacket of the cooling space.
  • the inventive division of the amount of air required for solidification into a conveying air portion with relatively low pressure and a supplementary air portion can ensure that discharge and atomization of the slags with small amounts of conveying air is achieved in the propulsion jet lance, so that an increase in the amount of slag escaping from the slag tundish is avoided with certainty can be.
  • the entire system can be operated at a relatively low pressure, the pressure indications in each case denoting the pressure above atmospheric pressure.
  • the conveying air quantity / t slag With an excess pressure of 0.5 to 3 bar in the conveying air jet, it is possible, as corresponds to a preferred embodiment of the method according to the invention, to set the conveying air quantity / t slag to be less than 35% of the supplementary air quantity.
  • the required amount of supplementary air can still be introduced with a significantly lower excess pressure and particularly preferably with a pressure between 0.2 and 0.5 bar.
  • the relatively small amounts of conveying air ensure that undesired hypothermia in the area of the slag outlet is avoided, and by restricting to conveying air and supplementary air, slags can also be granulated and solidified in a glass-like manner, which cannot be easily applied when using pressurized water or steam could become.
  • the hot air formed during the cooling and solidification of the slag is fed to a melting unit upstream of the tundish and / or a calcining unit.
  • a calcination unit the advantage is achieved that the neutralization of the melt that occurs during melting due to the high acidic proportions of the slags with a slag basicity CaO / SiO 2 of less than 1 contributes a large part of the required heat of fusion, this proportion contributing to the required Heat of fusion through neutralization can make up 15 to 30% of the required heat of fusion.
  • slags with the required basicity can be preferred in addition to rechazo slags, acidic blast furnace slags, waste slags, not iron-metallurgical slags, as in the Nickel and copper extraction occur, and slag from Shredder light fractions are used, which due to high metal content not easily with water or steam can be granulated.
  • the preferred device according to the invention for Implementation of this method is therefore advantageously designed that the compressed air lance in a temperature-resistant Tube is arranged insulated and that at the essentially cylindrical cold room an impact mill is connected. Due to the insulating arrangement of the compressed air lance, how mentioned at the beginning, an increase in the slag outlet is certain be avoided and by the measure at which essentially connect an impact mill directly to the cylindrical cooling can be another efficient shredding guaranteed at the same time with a safe removal of the granules become.
  • the device according to the invention is here advantageously designed so that the impact mill a rotating coaxially to the axis of the cylindrical cooling space Has rotor, with particular preference the impact mill as Firing pin mill is formed.
  • the glassy granules can be discharged via the Impact mill in a simple manner so that radially outside the ring of the impact mill arranged a ring collecting channel is, to achieve a continuous flow of granules with advantage the training is made so that the Annular collecting channel one in the circumferential direction to the outlet opening of the granules has a clear cross section.
  • the device according to the invention can in particular when cooling and the associated Contraction necessary to discharge the pressure in the Increase conveying gas flow again.
  • an impact mill and in particular a hammer mill itself in a particularly simple manner for the training meet that the rotor blades or fan blades on its circumference wearing.
  • the pressure increase achieved in this way the material obtained at 300 to 600 ° C as hot fines to a downstream view and / or Promote cyclone separators or filters, the remaining hot air preferred for the operation of a calcination unit and / or an upstream melting unit using sensible warmth can be.
  • the system can do this via the impact mill or impact pin mill and the rotor blades discharged material over a Filters are guided, with the remaining hot air preferred in a melting cyclone, preheating cyclone or in the form of a Calcination unit designed as a cyclone can be when the pressure of the hot gas through the rotor blades is raised to a suitable pressure level.
  • FIG. 1 shows a schematic configuration a first device for performing the invention Process partially in section
  • Figure 2 is an enlarged Representation of a for the training of Figure 1 usable compressed air box
  • Figure 3 is a modified Formation of a suitable impact mill combined with a schematic representation of a system concept for the Granulating slags.
  • FIG. 1 denotes a slag tundish in which there is an acid slag 2 with a typical composition of C / S ⁇ 0.7 and Al 2 O 3 > 6% by weight.
  • a weir pipe 3 is immersed in the molten slag, with which the free passage cross section of the liquid slag to the slag outlet 4 can be adjusted accordingly.
  • Sintered silicon carbide is preferably used as the material for this weir tube 3, which is distinguished by excellent thermal conductivity and is therefore thermally insulated from a compressed air lance 5 with the interposition of appropriate insulation 6.
  • Compressed air is typically blown in via the compressed air lance 5 in quantities of 0.5 Nm 3 / t at a maximum pressure of about 3 bar at ambient temperature, as a result of which the molten slag is atomized in a cooling chamber 7 adjoining the slag outlet 4.
  • the supplementary air required for cooling and to compensate for pressure losses is introduced via a compressed air box 8, the compressed air connection of which is schematically designated 9.
  • About 2 Nm 3 / t of air in the pressure range between 0.2 and 0.5 bar are typically introduced via this connection.
  • the partially thread-like solidifying, glass-like material passes in free fall to an impact mill 10, the rotor of which is designated 11.
  • the impact mill is designed as a striking pin mill and conveys the shredded material into an annular channel 12, from which the shredded material can be drawn off at temperatures between 300 and 600 ° C.
  • the exhaust air from the melting or calcining cyclone 17 can via line 19 into a pre-cyclone 20, in which the material is heated and via the lock 21st discharged and via line 22 to the melting or Calcining cyclone 17 can be supplied.
  • the exhaust air from the Preheating cyclone 20 is guided over an electrostatic filter 23, the material deposited in the electrostatic filter 23 via the Line 24 can be abandoned to the melting cyclone 17.
  • the drawn off the filter 23, largely pure combustion exhaust gas is withdrawn via a line 25 and points typically a temperature of about 300 ° C.
  • a temperature for calcining in Cyclone 17 has 26 fuels via a line are supplied, the task of the raw material, e.g. Marble with low Ca content, can be done at 27.
  • the raw material e.g. Marble with low Ca content
  • a two-stage cyclone can also be used to preheat the material Series connected, can be used.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Furnace Details (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
EP02450048A 2001-03-14 2002-03-06 Procédé de granulation de laitier Withdrawn EP1241271A3 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
AT0040301A AT409969B (de) 2001-03-14 2001-03-14 Einrichtung zum zerstäuben und granulieren von schmelzen
AT403012001 2001-03-14
AT645012001 2001-04-20
AT0064501A AT410099B8 (de) 2001-03-14 2001-04-20 Verfahren zum granulieren von schlacken

Publications (2)

Publication Number Publication Date
EP1241271A2 true EP1241271A2 (fr) 2002-09-18
EP1241271A3 EP1241271A3 (fr) 2003-01-15

Family

ID=25608316

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02450048A Withdrawn EP1241271A3 (fr) 2001-03-14 2002-03-06 Procédé de granulation de laitier

Country Status (2)

Country Link
EP (1) EP1241271A3 (fr)
AT (1) AT410099B8 (fr)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1282039B (de) * 1964-02-22 1968-11-07 Fritz Forschepiepe Verfahren zur Gewinnung von vorzerkleinerter Hochofenschlacke
LU81385A1 (de) * 1979-06-15 1981-02-03 Arbed Verfahren und vorrichtung zur herstellung von schlackenwolle aus hochofenschlacken
WO1989000470A1 (fr) * 1987-07-20 1989-01-26 Battelle Development Corporation Procede de double desintegration de poudre
DE4019563A1 (de) * 1990-06-15 1991-12-19 Mannesmann Ag Verfahren zur herstellung von metallpulver
DE19632698A1 (de) * 1996-08-14 1998-02-19 Forschungsgemeinschaft Eisenhu Verfahren zur Herstellung von Hüttensand mit geringer Partikelgröße
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
WO2000044942A1 (fr) * 1999-01-28 2000-08-03 'holderbank' Financiere Glarus Ag Procede et dispositif pour la granulation et la fragmentation de scories liquides

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1282039B (de) * 1964-02-22 1968-11-07 Fritz Forschepiepe Verfahren zur Gewinnung von vorzerkleinerter Hochofenschlacke
LU81385A1 (de) * 1979-06-15 1981-02-03 Arbed Verfahren und vorrichtung zur herstellung von schlackenwolle aus hochofenschlacken
WO1989000470A1 (fr) * 1987-07-20 1989-01-26 Battelle Development Corporation Procede de double desintegration de poudre
DE4019563A1 (de) * 1990-06-15 1991-12-19 Mannesmann Ag Verfahren zur herstellung von metallpulver
DE19632698A1 (de) * 1996-08-14 1998-02-19 Forschungsgemeinschaft Eisenhu Verfahren zur Herstellung von Hüttensand mit geringer Partikelgröße
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
WO2000044942A1 (fr) * 1999-01-28 2000-08-03 'holderbank' Financiere Glarus Ag Procede et dispositif pour la granulation et la fragmentation de scories liquides

Also Published As

Publication number Publication date
EP1241271A3 (fr) 2003-01-15
AT410099B (de) 2003-01-27
ATA6452001A (de) 2002-06-15
AT410099B8 (de) 2003-02-25

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