EP2270238B1 - Refroidissoir pour scories et procédé de refroidissement de scories - Google Patents

Refroidissoir pour scories et procédé de refroidissement de scories Download PDF

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Publication number
EP2270238B1
EP2270238B1 EP10155860A EP10155860A EP2270238B1 EP 2270238 B1 EP2270238 B1 EP 2270238B1 EP 10155860 A EP10155860 A EP 10155860A EP 10155860 A EP10155860 A EP 10155860A EP 2270238 B1 EP2270238 B1 EP 2270238B1
Authority
EP
European Patent Office
Prior art keywords
slag
coolant
cooling
bed
cooling bed
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.)
Active
Application number
EP10155860A
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German (de)
English (en)
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EP2270238A1 (fr
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.)
Schlackenaufbereitung GmbH and Co KG
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Schlackenaufbereitung GmbH and Co KG
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Publication of EP2270238A1 publication Critical patent/EP2270238A1/fr
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Publication of EP2270238B1 publication Critical patent/EP2270238B1/fr
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Classifications

    • 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
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0087—Treatment of slags covering the steel bath, e.g. for separating slag from the molten metal
    • 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
    • F27D15/00—Handling or treating discharged material; Supports or receiving chambers therefor
    • F27D15/02—Cooling
    • 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

Definitions

  • the invention relates to a device for cooling electric or LD slags and a method for cooling electric or LD slags.
  • the DE 14 33 462 A1 describes a method and apparatus for producing slag in broken form.
  • the object of the invention is therefore to provide a cooling bed for slags and a method for cooling slags, which avoids these disadvantages.
  • a Abg machinebett is provided for mixing fresh slag with cooled slag and that spatially separated from the Abg machinebett a cooling bed is provided which is designed as an open-topped basin, wherein means for generating a flow of coolant in the longitudinal direction of the cooling bed are provided.
  • the fresh slag is placed directly in the cooling bed and treated with coolant, so forms on cooling a glassy, hard surface layer, which also retards the cooling of the underlying layers due to their insulating properties. It has therefore proved to be useful to arrange already cooled slag in the casting bed and to mix the fresh slag with it (with a mixing ratio of 0.5: 1 to 2: 1 (cooled slag: fresh slag), preferably of about 1: 1 is selected).
  • the mixing process can be mechanically assisted, for example by turning and moving the slags contained in the Abg discernbett by means of a chain loader. As a result, a slag mixture is obtained with a temperature of about 800 ° C, of which then about half is transferred to the cooling bed.
  • the other half of the slag mixture remains in the casting bed to be mixed with the next batch of fresh slag.
  • a two-stage cooling is achieved, with a mechanical mixing with already cooled slag following the hydraulic cooling in the cooling bed, so that the hot phase is separated from the wet phase, which is also advantageous in terms of safety.
  • the Abg screenbett may also consist of concrete or be formed by driven into the ground sheet piling.
  • a preferred embodiment of the invention is that the means for generating a coolant flow in the longitudinal direction of the cooling bed comprise a gradient in the longitudinal direction of the cooling bed from the slag discharge point to the end of the cooling bed.
  • the gradient is 1 to 5 °, preferably 2 to 3 °.
  • This gradient in the cooling bed ensures that the coolant circulates from the slag feeding point to the end of the cooling bed.
  • a further development of the invention consists in that the means for generating a coolant flow in the longitudinal direction of the cooling bed comprise means for charging the slag with coolant in the region of the slag feed point and means for returning the coolant from the end of the cooling bed to the means for applying.
  • the coolant can be returned to the means for applying, for example via a conduit system with a pump.
  • the means for returning the coolant comprise means for cleaning the coolant.
  • the means for cleaning the coolant comprise at least a decanter and a mechanical filtration device.
  • the means for returning the coolant comprise a pumping basin.
  • This pumping basin is advantageously arranged behind the means for cleaning the coolant and serves as a coolant buffer in order to have sufficient coolant available at all times.
  • the pool is made of concrete.
  • the pool consists only of sheet piling, which is cheaper.
  • a preferred embodiment of the invention is that the basin of several, for example four, form-fitting connectable (eg via a tongue and groove joint) precast concrete can be created, by means of metallic clamping elements, such as clamping sleeves, which are guided in metal sleeves in the precast concrete parts with each other be clamped and already have a piping for the coolant.
  • metallic clamping elements such as clamping sleeves
  • steel slabs are inserted into the concrete in the area of the slag feeding point.
  • An advantageous development of the invention is that a metallic or ceramic wear protection is applied to the steel slabs.
  • the cooling bed is designed as an upwardly open basin 1, which consists for example of concrete and in which in the field of slag feeding site steel slabs 2 are recessed in recesses. These serve as wear protection and can also be protected by a support made of ceramic or highly wear-resistant steel.
  • means 3 for supplying the slag with coolant, as a rule with water, are provided, which are designed as spray lances 3.
  • means 6 for cleaning the coolant which comprise a heavy material decanter 6a, in particular metals, a calcium oxide separating tank 6b (CaO) and a mechanical filtering device 6c.
  • the means 6 for cleaning the coolant closes a pumping tank 7, which serves as a coolant buffer.
  • the coolant supply line 8 via which fresh coolant is supplied.
  • a pump 9 serves to circulate the coolant in the means 5 for returning the coolant.
  • the device is operated as follows.
  • a constant jet of water at a pressure of 0.5 bar is applied to the slag via the 6 nozzles of the means 3 for charging the slag, whereby the water penetrates into the slag and pollutants are flushed out of the slag.
  • the coolant is in this case continuously withdrawn through the grid 4, then decanted and freed of calcium oxide, then mechanically filtered and added in the pump tank 7 with fresh coolant to ensure a constant level. Subsequently, the coolant is supplied via the pump 9 back to the nozzles of the means 3 for charging the slag with coolant.
  • a complete system comprises at least one Abg cashbett 10 and a cooling bed 11, wherein here comprises a system with two Abgussbetten 10a and 10b and cooling beds 11a and 11b, which are each operated cyclically and which are separated by sheet piles 12.
  • a fresh slag is mechanically mixed by means of a chain loader 13 with previously already spread there already cooled slag to reach a slag temperature of about 800 ° C.
  • half of the slag mixture 14 thus produced is placed in the cooling bed 11a and acted upon by the nozzles of the means 3 for supplying the slag with cooling liquid, as is currently done in the cooling bed 11b.
  • the hot phase and the wet phase of the slag treatment thus take place spatially separated in the Abg jambett and in the cooling bed instead, which is also advantageous in terms of safety.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Analytical Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Furnace Details (AREA)

Claims (11)

  1. Dispositif pour refroidir du laitier d'aciérie électrique ou du laitier LD, caractérisé en ce qu'il est prévu une fosse de coulée pour mélanger du laitier frais avec du laitier refroidi, et en ce qu'il est prévu une fosse de refroidissement séparée spatialement de la fosse de coulée et conçue comme un bassin (1) ouvert vers le haut, des moyens (3, 5) étant prévus pour générer un courant de fluide de refroidissement dans la direction longitudinale de la fosse de refroidissement.
  2. Dispositif selon la revendication 1, caractérisé en ce que les moyens (3, 5) pour générer une circulation d'un fluide de refroidissement dans la direction longitudinale de la fosse de refroidissement comprennent une pente dans la direction longitudinale de la fosse de refroidissement et s'étendant depuis le point d'introduction du laitier jusqu'à la fin de la fosse de refroidissement.
  3. Dispositif selon la revendication 2, caractérisé en ce que la pente est comprise entre 1 ° et 5°, de préférence entre 2° et 3°.
  4. Dispositif selon la revendication 1 ou 2, caractérisé en ce que les moyens (3, 5) pour générer une circulation d'un fluide de refroidissement dans la direction longitudinale de la fosse de refroidissement comprennent des moyens (3) pour alimenter le laitier avec du fluide de refroidissement dans la zone du point d'introduction du laitier et des moyens (5) pour recycler le fluide de refroidissement depuis la fin de la fosse de refroidissement vers les moyens (3) d'alimentation.
  5. Dispositif selon la revendication 4, caractérisé en ce que les moyens (5) pour recycler le fluide de refroidissement comprennent des moyens (6) pour nettoyer le fluide de refroidissement.
  6. Dispositif selon la revendication 5, caractérisé en ce que les moyens (6) pour nettoyer le fluide de refroidissement comprennent au moins un dispositif de décantation (6a) et un dispositif de filtration (6c).
  7. Dispositif selon la revendication 4, caractérisé en ce que les moyens (5) pour recycler le fluide de refroidissement comprennent une pompe (7).
  8. Dispositif selon la revendication 1, caractérisé en ce que le bassin (1) est réalisé en béton.
  9. Dispositif selon la revendication 8, caractérisé en ce que des brames (2) en aciers sont insérées dans la zone du point d'introduction du laitier.
  10. Dispositif selon la revendication 9, caractérisé en ce qu'une couche de protection contre l'usure métallique ou céramique est appliquée sur les brames en acier (2).
  11. Procédé pour refroidir du laitier d'aciérie électrique ou du laitier LD, caractérisé par les étapes de procédé suivantes :
    • le laitier est mélangé à du laitier refroidi dans une fosse de coulée pour obtenir un mélange de laitier ayant une température de laitier d'environ 800 °C,
    • la moitié du mélange de laitier reste dans la fosse de coulée et l'autre moitié est transportée dans une fosse de refroidissement séparée spatialement de la fosse de coulée et conçue sous la forme d'un bassin (1), lequel bassin présente dans la direction longitudinale une pente s'étendant depuis le point d'introduction du laitier jusqu'à la fin du bassin (1),
    • le laitier, dans la zone du point d'introduction, est alimenté en fluide de refroidissement par le biais de moyens (3) d'alimentation,
    • le fluide de refroidissement est recyclé par le biais de moyens (5) de recyclage du fluide de refroidissement depuis la fin du bassin (1) jusqu'aux moyens (3) d'alimentation, et
    • des moyens (6) sont prévus dans la zone des moyens (5) de recyclage du fluide de refroidissement pour nettoyer le fluide de refroidissement.
EP10155860A 2009-06-30 2010-03-09 Refroidissoir pour scories et procédé de refroidissement de scories Active EP2270238B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102009026076A DE102009026076A1 (de) 2009-06-30 2009-06-30 Kühlbett für Schlacken und Verfahren zum Kühlen von Schlacken

Publications (2)

Publication Number Publication Date
EP2270238A1 EP2270238A1 (fr) 2011-01-05
EP2270238B1 true EP2270238B1 (fr) 2012-09-26

Family

ID=42315840

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10155860A Active EP2270238B1 (fr) 2009-06-30 2010-03-09 Refroidissoir pour scories et procédé de refroidissement de scories

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EP (1) EP2270238B1 (fr)
DE (1) DE102009026076A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102269529B (zh) * 2011-07-20 2013-05-08 北京中冶设备研究设计总院有限公司 高温熔渣流量与冷却水量闭环控制方法及装置

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT256691B (de) 1962-02-22 1967-09-11 Colvilles Ltd Verfahren und Vorrichtung zum Verarbeiten geschmolzener Schlacke
DE1458808A1 (de) * 1965-11-05 1969-02-06 Acieries Et Minieres De La Sam Verfahren und Vorrichtung zum Granulieren von Schlacke
FR2021991A1 (en) * 1968-10-31 1970-07-24 Arbed Granulated blast furnace slag
LU57207A1 (fr) 1968-10-31 1970-05-04
DE2259084C3 (de) * 1972-12-02 1975-07-10 Linco Gmbh, 5205 St Augustin Muldenförmiges, feuerfestes Fertigbauteil für Abstichrinnen von Hochöfen und anderen metallurgischen Öfen
JPS5114883Y2 (fr) * 1973-05-10 1976-04-20
LU82585A1 (fr) * 1980-07-04 1980-12-15 Wurth Anciens Ets Paul Procede et installation de granulation de laitier
NO300877B1 (no) * 1995-12-07 1997-08-11 Elkem Materials Anordning ved granulering av metall og slagg
JPH1129810A (ja) 1997-07-08 1999-02-02 Sumitomo Metal Ind Ltd ステンレス還元期スラグの処理方法及び処理装置

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Publication number Publication date
DE102009026076A1 (de) 2011-01-13
EP2270238A1 (fr) 2011-01-05

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