EP2270238B1 - Cooling bed for slag and method for cooling slag - Google Patents

Cooling bed for slag and method for cooling slag 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
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Prior art keywords
slag
coolant
cooling
bed
cooling bed
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German (de)
French (fr)
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EP2270238A1 (en
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Schlackenaufbereitung GmbH and Co KG
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Schlackenaufbereitung GmbH and Co KG
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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
    • 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.

Description

Die Erfindung betrifft eine Vorrichtung zum Kühlen von Elektro- oder LD-Schlacken und ein Verfahren zum Kühlen von Elektro- oder LD-Schlacken.The invention relates to a device for cooling electric or LD slags and a method for cooling electric or LD slags.

Es ist bekannt, Schlacken, beispielsweise Elektroschlacken oder LD-Schlacken, durch Beaufschlagen mit Wasser zu kühlen. Allerdings bringt dies einerseits einen hohen Wasserverbrauch mit sich und führt andererseits zu einem Eintrag der löslichen Schadstoffe aus den Schlacken in den Boden.It is known to cool slags, for example electro-slags or LD slags, by applying water. However, on the one hand this entails a high water consumption and on the other hand leads to an entry of the soluble pollutants from the slags into the soil.

Aus der JP 11 029810 A ist ein Verfahren zum Verhindern von Pulverstaub und zum Rückgewinnen von Metall aus Schlacke bekannt, bei dem Wasser auf pulverige Schlacke gesprüht wird.From the JP 11 029810 A For example, a method of preventing powder dust and recovering metal from slag by spraying water onto powdery slag is known.

Aus der LU 57 207 A1 ist ein Verfahren zum Granulieren von Hochofenschlacke bekannt.From the LU 57 207 A1 For example, a method for granulating blast furnace slag is known.

Die DE 14 33 462 A1 beschreibt ein Verfahren und eine Vorrichtung zur Herstellung von Schlacke in gebrochener Form.The DE 14 33 462 A1 describes a method and apparatus for producing slag in broken form.

Aufgabe der Erfindung ist es daher, ein Kühlbett für Schlacken und ein Verfahren zum Kühlen von Schlacken zu schaffen, das diese Nachteile vermeidet.The object of the invention is therefore to provide a cooling bed for slags and a method for cooling slags, which avoids these disadvantages.

Diese Aufgabe wird erfindungsgemäß dadurch gelöst, daß ein Abgießbett zum Mischen frischer Schlacke mit abgekühlter Schlacke vorgesehen ist und daß von dem Abgießbett räumlich getrennt ein Kühlbett vorgesehen ist, das als nach oben offenes Becken ausgestaltet ist, wobei Mittel zum Erzeugen einer Kühlmittelströmung in Längsrichtung des Kühlbettes vorgesehen sind.This object is achieved in that a Abgießbett is provided for mixing fresh slag with cooled slag and that spatially separated from the Abgießbett 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.

Es hat sich im Rahmen der Erfindung gezeigt, daß durch das in Längsrichtung des Kühlbettes strömende Kühlmittel eine schnelle Kühlung der Schlacken bei weitgehender Dampfvermeidung erfolgt. Zudem bewirkt die durch die erzwungene Strömung erreichte hohe Kühlrate eine Einbindung der Schadstoffe in die Schlacken, die eine spätere Nutzung der Schlacken erleichtert. Bei LD-Schlacken wird beispielsweise der freie Kalk umgewandelt.It has been found in the context of the invention that by the coolant flowing in the longitudinal direction of the cooling bed, a rapid cooling of the slags in the far Steam avoidance takes place. In addition, the high cooling rate achieved by the forced flow causes the pollutants to be incorporated into the slags, which facilitates later utilization of the slags. With LD slags, for example, the free lime is converted.

Wird die frische Schlacke direkt in das Kühlbett gegeben und mit Kühlmittel beaufschlagt, so bildet sich beim Abkühlen eine glasartige, harte Oberflächenschicht, die aufgrund ihrer isolierenden Eigenschaften zudem das Abkühlen der darunterliegenden Schichten retardiert. Es hat sich daher als sinnvoll erwiesen, in dem Abgießbett bereits abgekühlte Schlacke anzuordnen und die frische Schlacke mit dieser zu mischen (wobei ein Mischungsverhältnis von 0,5 : 1 bis 2:1 (abgekühlte Schlacke : frische Schlacke), vorzugsweise von etwa 1 : 1 gewählt wird). Der Mischvorgang kann mechanisch unterstützt werden, beispielsweise durch Wenden und Bewegen der in dem Abgießbett enthaltenen Schlacken mittels eines Kettenladers. Hierdurch wird ein Schlackengemisch mit einer Temperatur von ca. 800°C erhalten, von dem dann etwa die Hälfte in das Kühlbett transferiert wird. Die andere Hälfte des Schlackengemischs verbleibt in dem Abgießbett, um mit der nächsten Charge frischer Schlacke vermischt zu werden. Auf diese Weise wird eine zweistufige Kühlung erreicht, wobei auf ein mechanisches Vermischen mit bereits abgekühlter Schlacke die hydraulische Kühlung in dem Kühlbett folgt, so daß die heiße Phase von der Naßphase getrennt ist, was auch unter Sicherheitsaspekten von Vorteil ist. Das Abgießbett kann ebenfalls aus Beton bestehen oder durch in den Boden getriebene Spundwände gebildet sein.If 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 Abgießbett 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. In this way, 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 Abgießbett may also consist of concrete or be formed by driven into the ground sheet piling.

Eine bevorzugte Ausgestaltung der Erfindung besteht darin, daß die Mittel zum Erzeugen einer Kühlmittelströmung in Längsrichtung des Kühlbettes ein Gefälle in Längsrichtung des Kühlbettes von der Schlackenaufgabestelle zum Ende des Kühlbettes hin umfassen.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.

Es ist sinnvoll, daß das Gefälle 1 bis 5°, vorzugsweise 2 bis 3° beträgt.It makes sense that the gradient is 1 to 5 °, preferably 2 to 3 °.

Durch dieses Gefälle im Kühlbett wird erreicht, daß das Kühlmittel von der Schlackenaufgabestelle zum Ende des Kühlbettes hin zirkuliert.This gradient in the cooling bed ensures that the coolant circulates from the slag feeding point to the end of the cooling bed.

Eine Weiterbildung der Erfindung besteht darin, daß die Mittel zum Erzeugen einer Kühlmittelströmung in Längsrichtung des Kühlbettes Mittel zum Beaufschlagen der Schlacke mit Kühlmittel im Bereich der Schlackenaufgabestelle und Mittel zum Rückführen des Kühlmittels von dem Ende des Kühlbettes zu den Mitteln zum Beaufschlagen umfassen.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.

Auf diese Weise kann das Kühlmittel zu den Mitteln zum Beaufschlagen zurückgeführt werden, beispielsweise über ein Leitungssystem mit einer Pumpe.In this way, the coolant can be returned to the means for applying, for example via a conduit system with a pump.

In diesem Zusammenhang ist es vorteilhaft, daß die Mittel zum Rückführen des Kühlmittels Mittel zum Reinigen des Kühlmittels umfassen.In this connection, it is advantageous that the means for returning the coolant comprise means for cleaning the coolant.

Es ist zweckmäßig, daß die Mittel zum Reinigen des Kühlmittels mindestens eine Dekantiervorrichtung und eine mechanische Filtriervorrichtung umfassen.It is expedient that the means for cleaning the coolant comprise at least a decanter and a mechanical filtration device.

Weiterhin ist es vorteilhaft, daß die Mittel zum Rückführen des Kühlmittels ein Pumpbecken umfassen.Furthermore, it is advantageous that the means for returning the coolant comprise a pumping basin.

Dieses Pumpbecken ist vorteilhafterweise hinter den Mitteln zum Reinigen des Kühlmittels angeordnet und es dient als Kühlmittelpuffer, um jederzeit ausreichend Kühlmittel zur Verfügung zu haben.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.

Eine vorteilhafte Weiterbildung der Erfindung besteht darin, daß das Becken aus Beton besteht.An advantageous development of the invention is that the pool is made of concrete.

Es ist allerdings ebenso möglich, daß das Becken lediglich aus Spundwänden besteht, was kostengünstiger ist.However, it is also possible that the pool consists only of sheet piling, which is cheaper.

Eine bevorzugte Ausbildung der Erfindung darin, daß das Becken aus mehreren, beispielsweise vier, formschlüssig verbindbaren (z.B. über eine Nut-Feder-Verbindung) Betonfertigteilen erstellbar ist, die mittels metallischer Spannelemente, beispielsweise Spannhülsen, welche in Metallhülsen in den Betonfertigteilen geführt sind, miteinander verspannt werden und bereits eine Verrohrung für das Kühlmittel aufweisen.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.

In diesem Zusammenhang ist es zweckmäßig, daß im Bereich der Schlackenaufgabestelle Stahlbrammen in den Beton eingelegt sind.In this context, it is expedient that steel slabs are inserted into the concrete in the area of the slag feeding point.

Da die Schlacken in der Regel aus mehreren Metern Höhe auf das Kühlbett geworfen werden, ist die Schlackenaufgabestelle stark beansprucht. Es hat sich im Rahmen der Erfindung gezeigt, daß Stahlbrammen im Bereich der Schlackenaufgabestelle, die die Hauptverschleißzone darstellt, die Standzeit des Kühlbettes deutlich erhöhen.Since the slags are thrown usually from several meters high on the cooling bed, the slag application point is heavily stressed. It has been found within the scope of the invention that steel slabs in the region of the slag feeding point, which represents the main wear zone, significantly increase the service life of the cooling bed.

Eine vorteilhafte Weiterbildung der Erfindung besteht darin, daß ein metallischer oder keramischer Verschleißschutz auf die Stahlbrammen aufgebracht ist.An advantageous development of the invention is that a metallic or ceramic wear protection is applied to the steel slabs.

Durch einen derartigen Verschleißschutz, der beispielsweise in Form von hochverschleißfesten Stahlblechen oder Keramikauflagen auf die Stahlbrammen aufgebracht wird, erhöht sich die Standzeit des Kühlbettes deutlich.By such wear protection, which is applied for example in the form of highly wear-resistant steel sheets or ceramic pads on the steel slabs, the service life of the cooling bed increases significantly.

Im Rahmen der Erfindung liegt auch ein Verfahren zum Kühlen von Schlacke, gekennzeichnet durch folgende Verfahrensschritte:

  • die Schlacke wird in einem Abgießbett mit abgekühlter Schlacke vermischt, um ein Schlackengemisch mit einer Schlackentemperatur von ca. 800°C zu erzielen,
  • eine Hälfte des Schlackengemischs verbleibt im Abgießbett und die andere Hälfte wird in ein von dem Abgießbett räumlich getrenntes Kühlbett transportiert, das als Becken (1) ausgestaltet ist, welches in Längsrichtung von der Schlackenaufgabestelle zum Ende des Beckens (1) hin ein Gefälle aufweist,
  • die Schlacke wird im Bereich der Schlackenaufgabestelle über Mittel (3) zum Beaufschlagen mit Kühlmittel beaufschlagt,
  • das Kühlmittel wird über Mittel (5) zum Rückführen des Kühlmittels von dem Ende des Beckens (1) zu den Mitteln (3) zum Beaufschlagen rückgeführt und
  • im Bereich der Mittel (5) zum Rückführen des Kühlmittels sind Mittel (6) zum Reinigen des Kühlmittels vorgesehen.
Within the scope of the invention is also a method for cooling slag, characterized by the following method steps:
  • the slag is mixed with cooled slag in a Abgussbett to achieve a slag mixture with a slag temperature of about 800 ° C,
  • one half of the slag mixture remains in the Abgießbett and the other half is transported in a spatially separated from the Abgießbett cooling bed, which is designed as a basin (1), which in the longitudinal direction of the slag discharge point to the end of the basin (1) down a slope,
  • the slag is acted upon by means (3) for supplying coolant in the area of the slag feeding point,
  • the coolant is returned via means (5) for returning the refrigerant from the end of the basin (1) to the means (3) for charging and
  • in the region of the means (5) for returning the coolant means (6) are provided for cleaning the coolant.

Es wird also sichergestellt, daß eine Kühlmittelströmung in Längsrichtung des Kühlbettes vorliegt, die eine hohe Kühlrate und ein Einbinden von Schadstoffen ermöglicht. Zudem wird das Kühlmittel im Kreis geführt, was sowohl in ökonomischer als auch in ökologischer Hinsicht von Vorteil ist, da sowohl ein geringer Kühlmittelverbrauch gegeben ist als auch ein Kühlmittel- und Schadstoffeintrag in das Grundwasser vermieden wird.It is thus ensured that a coolant flow is present in the longitudinal direction of the cooling bed, which allows a high cooling rate and incorporation of pollutants. In addition, the coolant is circulated, which is advantageous in both economic and environmental terms, since both a low coolant consumption is given as well as a coolant and pollutant input is avoided in the groundwater.

Wie bereits oben ausgeführt, ist es sinnvoll, die heiße Phase von der Naßphase zu trennen, was durch ein derartiges vorheriges Abkühlen der Schlacke vor der Aufgabe auf das Kühlbett erfolgen kann.As stated above, it makes sense to separate the hot phase from the wet phase, which can be done by such a previous cooling of the slag before the task on the cooling bed.

In diesem Zusammenhang ist es sinnvoll, daß eine Hälfte des Schlackengemischs im Abgießbett verbleibt und die andere Hälfte in das Kühlbett transportiert wird.In this context, it makes sense that one half of the slag mixture remains in the Abgießbett and the other half is transported into the cooling bed.

Nachfolgend werden Ausführungsbeispiele der Erfindung anhand von Zeichnungen erläutert.Hereinafter, embodiments of the invention will be explained with reference to drawings.

Es zeigen

Fig. 1
eine Draufsicht auf ein erfindungsgemäßes Kühlbett für Elektroschlacken,
Fig. 2
eine Seitenansicht eines erfindungsgemäßen Kühlbettes gemäß Fig. 1,
Fig. 3
eine Draufsicht auf ein erfindungsgemäßes Kühlbett für LD-Schlacken
Fig. 4
eine Draufsicht auf eine Anlage mit zwei Abguß- und zwei Kühlbetten.
Show it
Fig. 1
a top view of an inventive cooling bed for electroslag,
Fig. 2
a side view of a cooling bed according to the invention Fig. 1 .
Fig. 3
a plan view of an inventive cooling bed for LD slags
Fig. 4
a plan view of a plant with two casting and two cooling beds.

Wie aus den Fig. 1 bis 3 ersichtlich, ist das Kühlbett als nach oben offenes Becken 1 ausgestaltet, das beispielsweise aus Beton besteht und in das im Bereich der Schlackenaufgabestelle Stahlbrammen 2 in Vertiefungen eingelassen sind. Diese dienen als Verschleißschutz und können zusätzlich durch eine Auflage aus Keramik oder hochverschleißfestem Stahl geschützt werden.Like from the Fig. 1 to 3 it can be seen, 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.

Im Bereich der Schlackenaufgabestelle sind Mittel 3 zum Beaufschlagen der Schlacke mit Kühlmittel, in der Regel mit Wasser, vorgesehen, die als Sprühlanzen 3 ausgebildet sind.In the area of the slag feeding point, means 3 for supplying the slag with coolant, as a rule with water, are provided, which are designed as spray lances 3.

Aus Fig. 2 ist ersichtlich, daß das Becken 1 vom Bereich der Schlackenaufgabestelle zum Ende des Beckens 1 hin ein Gefälle von ca. 2° aufweist, so daß das Kühlmittel in Längsrichtung des Beckens 1 zu dessen Ende hin strömt. Dort tritt das Kühlmittel durch ein Gitter 4 und wird über Mittel 5 zum Rückführen des Kühlmittels wieder zu den Mitteln 3 zum Beaufschlagen des Kühlmittels zurückgeführt. Das Kühlmittel zirkuliert also, so daß nur das verdampfte Kühlmittel durch Zugabe von frischem Kühlmittel ersetzt werden muß.Out Fig. 2 It can be seen that the basin 1 from the region of the slag feeding point to the end of the basin 1 down a slope of about 2 °, so that the coolant flows in the longitudinal direction of the basin 1 to the end. There, the coolant passes through a grid 4 and is returned via means 5 for returning the coolant back to the means 3 for supplying the coolant. The coolant circulates, so that only the evaporated coolant must be replaced by the addition of fresh coolant.

Im Bereich der Mittel 5 zum Rückführen des Kühlmittels sind Mittel 6 zum Reinigen des Kühlmittels angeordnet, die eine Dekantiervorrichtung 6a für schwere Stoffe, insbesondere Metalle, ein Trennbecken 6b für Calciumoxid (CaO) und eine mechanische Filtriervorrichtung 6c umfassen. An die Mittel 6 zum Reinigen des Kühlmittels schließt sich ein Pumpbecken 7 an, das als Kühlmittelpuffer dient. In das Pumpbecken 7 mündet die Kühlmittelzuleitung 8, über die frisches Kühlmittel zugeführt wird. Eine Pumpe 9 dient der Kühlmittelzirkulation in den Mitteln 5 zum Rückführen des Kühlmittels.In the area of the means 5 for returning the coolant, there are arranged 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. In the pump tank 7, 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.

Die Vorrichtung wird wie folgt betrieben.The device is operated as follows.

Es wird im Bereich der Schlackenaufgabe Schlacke in Schichten von ca. 40 cm Dicke aufgebracht. Anschließend werden die Mittel 3 zum Beaufschlagen der Schlacke mit Kühlmittel betätigt. Hierdurch wird bewirkt, daß die Schlacke kristallisiert und zerfällt.In the field of slag feeding slag is applied in layers of approx. 40 cm thickness. Subsequently, the means 3 for supplying the slag with coolant are actuated. This causes the slag to crystallize and disintegrate.

Während 30 min wird über die 6 Düsen der Mittel 3 zum Beaufschlagen der Schlacke ein konstanter Wasserstrahl mit einem Druck von 0,5 bar auf die Schlacke aufgebracht, wobei das Wasser in die Schlacke eindringt und Schadstoffe aus der Schlacke ausgespült werden.During 30 minutes, 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.

Das Kühlmittel wird hierbei laufend über das Gitter 4 abgezogen, dann dekantiert und von Calciumoxid befreit, dann mechanisch gefiltert und im Pumpbecken 7 mit frischem Kühlmittel versetzt, um einen konstanten Füllstand sicherzustellen. Anschließend wird das Kühlmittel über die Pumpe 9 wieder den Düsen der Mittel 3 zum Beaufschlagen der Schlacke mit Kühlmittel zugeführt.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.

Wie aus Fig. 4 ersichtlich, umfaßt eine komplette Anlage mindestens ein Abgießbett 10 und ein Kühlbett 11, wobei hier eine Anlage mit je zwei Abgießbetten 10a und 10b und Kühlbetten 11a und 11b umfaßt, die jeweils zyklisch betrieben werden und die durch Spundwände 12 voneinander getrennt sind. In dem Abgießbett 10a wird mittels eines Kettenladers 13 frische Schlacke mit zuvor dort ausgebreiteter bereits abgekühlter Schlacke mechanisch gemischt, um eine Schlackentemperatur von ca. 800°C zu erreichen. Anschließend wird die Hälfte des so erzeugten Schlackengemischs 14 in das Kühlbett 11a gegeben und über die Düsen der Mittel 3 zum Beaufschlagen der Schlacke mit Kühlflüssigkeit beaufschlagt, wie dies gerade in dem Kühlbett 11b erfolgt. Die heiße Phase und die nasse Phase der Schlackenbehandlung finden somit räumlich voneinander getrennt in dem Abgießbett und in dem Kühlbett statt, was auch unter Sicherheitsaspekten von Vorteil ist.How out Fig. 4 As can be seen, a complete system comprises at least one Abgießbett 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. In the Abgießbett 10 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. Subsequently, 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 Abgießbett and in the cooling bed instead, which is also advantageous in terms of safety.

Claims (11)

  1. Arrangement for the cooling of electroslags or LD slags, characterised in that a decanting bed is provided in which fresh slag is mixed with cooled slag and that a cooling bed is provided which is separated spatially from the decanting bed and is configured as an open-topped basin (1), means (3, 5) for generating a coolant flow in the longitudinal direction of the cooling bed being provided.
  2. Arrangement according to claim 1, characterised in that the means (3, 5) for generating a coolant flow in the longitudinal direction of the cooling bed include a gradient in the longitudinal direction of the cooling bed from the slag feed point to the end of the cooling bed.
  3. Arrangement according to claim 2, characterised in that the gradient is 1 to 5°, preferably 2 to 3°.
  4. Arrangement according to claim 1 or claim 2, characterised in that the means (3, 5) for generating a coolant flow in the longitudinal direction of the cooling bed include means (3) for impacting the slag with coolant in the area of the slag feed point and means (5) for returning the coolant from the end of the cooling bed to the impacting means (3).
  5. Arrangement according to claim 4, characterised in that the means (5) for returning the coolant include coolant-cleaning means (6).
  6. Arrangement according to claim 5, characterised in that the coolant-cleaning means (6) include at least one decanting device (6a) and a mechanical filtering device (6c).
  7. Arrangement according to claim 4, characterised in that the means (5) for returning the coolant include a pump basin (7).
  8. Arrangement according to claim 1, characterised in that the basin (1) consists of concrete.
  9. Arrangement according to claim 8, characterised in that steel slabs (2) are inserted into the concrete in the area of the slag feed point.
  10. Arrangement according to claim 9, characterised in that the steel slabs (2) have a metallic or ceramic coating to protect against wear.
  11. Method for cooling electroslags or LD slags, characterised by the following steps:
    • mixing the slag with cooled slag in a decanting bed in order to obtain a slag mixture with a slag temperature of approx. 800 °C,
    • leaving half of the slag mixture in the decanting bed and transferring the other half to a cooling bed which is spatially separated from the decanting bed and is configured as a basin (1) that slopes, in the longitudinal direction of the cooling bed, from the slag feed point to the end of the basin (1),
    • impacting the slag with coolant in the area of the slag feed point via impacting means (3),
    • returning the coolant from the end of the basin (1) to the impacting means (3) via coolant-return means (5), and
    • providing coolant-cleaning means (6) in the area of the coolant-return means (5).
EP10155860A 2009-06-30 2010-03-09 Cooling bed for slag and method for cooling slag Active EP2270238B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102009026076A DE102009026076A1 (en) 2009-06-30 2009-06-30 Cooling bed for slag and method for cooling slag

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EP2270238A1 EP2270238A1 (en) 2011-01-05
EP2270238B1 true EP2270238B1 (en) 2012-09-26

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Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102269529B (en) * 2011-07-20 2013-05-08 北京中冶设备研究设计总院有限公司 Closed loop control method and device for high-temperature slag flow and cooling water amount

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1433462A1 (en) 1962-02-22 1968-11-28 Colvilles Ltd Method and device for producing slag in broken form
DE1458808A1 (en) * 1965-11-05 1969-02-06 Acieries Et Minieres De La Sam Method and device for granulating slag
FR2021991A1 (en) * 1968-10-31 1970-07-24 Arbed Granulated blast furnace slag
LU57207A1 (en) 1968-10-31 1970-05-04
DE2259084C3 (en) * 1972-12-02 1975-07-10 Linco Gmbh, 5205 St Augustin Trough-shaped, refractory prefabricated component for tapping channels in blast furnaces and other metallurgical furnaces
JPS5114883Y2 (en) * 1973-05-10 1976-04-20
LU82585A1 (en) * 1980-07-04 1980-12-15 Wurth Anciens Ets Paul DAIRY PELLET PROCESS AND PLANT
NO300877B1 (en) * 1995-12-07 1997-08-11 Elkem Materials Device for granulation of metal and slag
JPH1129810A (en) 1997-07-08 1999-02-02 Sumitomo Metal Ind Ltd Treatment of slag in reducing period of stainless steel and treating apparatus thereof

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EP2270238A1 (en) 2011-01-05

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