EP1097245A1 - Method for wet granulation of liquid-slag - Google Patents

Method for wet granulation of liquid-slag

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Publication number
EP1097245A1
EP1097245A1 EP99929210A EP99929210A EP1097245A1 EP 1097245 A1 EP1097245 A1 EP 1097245A1 EP 99929210 A EP99929210 A EP 99929210A EP 99929210 A EP99929210 A EP 99929210A EP 1097245 A1 EP1097245 A1 EP 1097245A1
Authority
EP
European Patent Office
Prior art keywords
basin
granulating
granulate
water
decanting
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.)
Granted
Application number
EP99929210A
Other languages
German (de)
French (fr)
Other versions
EP1097245B1 (en
Inventor
Léon Ulveling
Jean-Luc Roth
Henri Radoux
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.)
Paul Wurth SA
Original Assignee
Paul Wurth SA
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 Paul Wurth SA filed Critical Paul Wurth SA
Publication of EP1097245A1 publication Critical patent/EP1097245A1/en
Application granted granted Critical
Publication of EP1097245B1 publication Critical patent/EP1097245B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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
    • 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
    • C21B2400/066—Receptacle features where the slag is treated
    • C21B2400/072—Tanks to collect the slag, e.g. water tank

Definitions

  • the present invention relates to a device for wet granulation of liquid slag.
  • a liquid slag stream is introduced into a powerful water stream, the liquid slag caught by the water stream being granulated, solidified and cooled. The granules are then dewatered.
  • Devices for wet granulation of liquid slag are known, for example, from the blast furnace sector. They include a pelletizing basin with a spraying device for the pelletizing water and a device for dewatering the pellet.
  • Classic dewatering devices include a decanting basin, separated from the granulating basin, in which the slag granulate settles.
  • the present invention has for its object a simple and at the same time to create a very compact device for wet granulation of liquid slag. This object is achieved according to the invention by a device according to claim 1.
  • the device according to the invention for the wet granulation of liquid slag comprises a granulating basin with an injection device for the granulating water, a decanting basin separated from the granulating basin, in which the slag settles as granulate, and a device for introducing the granulate-water mixture from the granulating basin into the decanting basin .
  • This device comprises at least one elongated distribution channel which extends over the decanting basin and has on its underside distributed outflow means for the granulate / water mixture over its length.
  • These outflow means can comprise, for example, one outflow slot or a plurality of outflow openings arranged one behind the other.
  • a vertical, downwardly open inflow shaft is arranged below the at least one distribution channel, into which the outflow means for the pellet-water mixture open.
  • This inflow shaft can be formed in a simple manner, for example, by two screen walls attached to the distribution channel.
  • the granulate-water mixture can be introduced into the decanting basin largely without turbulence through the distribution channel, its outflow means and the inflow shaft. This ensures that the slag granulate settles satisfactorily even in relatively small decanting tanks.
  • the present invention thus makes it possible to create a compact device for wet granulation of liquid slag with extremely simple means.
  • the decanting basin advantageously has overflow devices for the granulating water at its upper edge.
  • the "clarified" pelletizing water, during the pelletizing, is removed from the decanting basin via these overflow devices and, if necessary, returned to the injection device in the decanting basin.
  • the distribution channel is lower than these overflow devices and consequently below the water level in the Decanting basin.
  • this basin advantageously has at least one funnel-shaped depression with an outflow nozzle and a shut-off valve for closing the outflow nozzle.
  • the use of space in the decanting basin is optimized in that the inflow shaft and the at least one funnel-shaped depression have a common plane of symmetry.
  • a particularly compact device can be achieved in that the granulating basin has a plurality of funnel-shaped depressions one behind the other, the inflow shaft and the funnel-shaped depressions lying one behind the other having a common plane of symmetry
  • the pelletizing tank is advantageously designed as an elongated trough with a bottom surface, two side surfaces and two end surfaces.
  • the injection device for the pelletizing water is arranged at a first end of this trough, and the at least one distributor channel forms its opening into the pelletizing tank at the opposite end of the trough.
  • the injection device for the granulating water comprises a chamber which encloses the first end of the tub and
  • Granulating water is preferably arranged both in the two side surfaces and in the end surface at the first end of the tub.
  • FIG. 1 shows a longitudinal section through a device according to the invention for wet granulation of liquid slag, with a slag pan in the emptying position; 2 shows a plan view of the device of FIG. 1, without slag pans; and FIG. 3: a cross section along the section line AA through the device of FIG. 1.
  • reference number 10 denotes a slag pan with liquid slag, which is to be granulated in a granulating device 12 according to the invention.
  • This granulating device 12 essentially consists of a granulating basin 14 and a decanting basin 16 which is directly attached to the granulating basin 14.
  • the shown granulating device 12 further comprises a swiveling device 18 for emptying the slag pan 10 into the granulating tank 14.
  • the swiveling device 18 grips the slag pan 10 on its bearing journal 20 and swivels it about a swiveling axis 22 into a dispensing position above the rear end of the granulating tank 14, so that the liquid slag can enter the granulating tank 14.
  • the angle of inclination of the pan 10 is adjusted in such a way that a stream of slag which is as constant as possible flows into the granulating tank 14.
  • the granulating basin 14 is formed by an elongated trough which has a bottom surface 24, two side surfaces 26, 28, and a rear end surface 30 and a front end surface 32.
  • the liquid slag flows from the slag pan 10 into the rear end of the granulating basin 14.
  • an injection device for the granulating water is built into the tub. This injection device comprises a water chamber 34 which surrounds the rear end face 30 and the rear section of the two side faces 26 and 28.
  • the water chamber 34 is charged with the pelletizing water via connecting pieces 35.
  • the pelletizing water flows out of the water chamber 34 into the elongated trough of the pelletizing tank through a plurality of outlet openings 36 in the end face 30 and the two side faces 26 and 28.
  • An inflow velocity of approximately 10 m / s should be achieved at the outlet openings 36.
  • About 15 kg of water should be injected into the granulating basin 14 per kg of liquid slag.
  • the liquid slag is caught by the granulating water stream, where it granulates and solidifies.
  • the granulating basin 14 is connected to the decanting basin 16 via a device for introducing the granulate-water mixture into the decanting basin 16, which is designated globally in the figures with the reference symbol 38.
  • This device 38 comprises at least one tubular distribution channel 40 which extends over the decanting basin 16 in the longitudinal direction thereof.
  • this distribution channel 40 has outflow means 42 for the granulate-water mixture, which are distributed over the length of the decanting basin 16.
  • These outflow means 42 can comprise, for example, one or more outflow slots and / or several outflow openings arranged one behind the other.
  • the outflow means 42 should be designed in such a way that the granulate-water flow from the granulating basin through the distribution channel 40 is distributed as uniformly as possible over the entire length of the decanting basin 16. It should be noted that the distribution channel 14 is laid with a slope, the upper end in the front end wall 32 of the granulating basin 14, immediately above the bottom surface 24, forming an opening 44 for the granulate-water flow.
  • the lower end of the distribution channel 14 is closed and lies on a support base 45 on the decanting basin 16.
  • the granulating basin 14 comprises an overflow 46 on its front end wall 32, which is also connected to the distribution channel 14 by means of an overflow pipe 48.
  • shield walls 50, 52 are attached on both sides of the distribution channel, which extend into the decanting basin 16 to far below the outflow means 42 in the distribution channel 40.
  • These screen walls 50, 52 form below the distribution channel 40 a downwardly open vertical inflow shaft 54, into which the outflow means 42 for the granulate-water mixture open.
  • the granulate water Mixture be introduced into the decanting basin 16 largely without turbulence. This ensures that the slag granulate settles satisfactorily in the relatively small decanting basin 16.
  • the decanting basin 16 has an overflow channel 56 for the granulating water at its upper edge.
  • the "clarified” granulating water is discharged from the decanting basin 16 via this overflow channel 56 during the granulation. It was noted that the distribution channel 40 lies lower and consequently below the water level 58 in the decanting basin 16.
  • the device according to the invention for introducing the granulate-water mixture into the decanting basin 16 described above ensures that most of the granulate particles settle in the decanting basin 16 before the granulating water flows into the peripheral overflow channel 56.
  • the "clarified” granulating water can be fed back into the injection device of the granulating basin 14 from the overflow channel.
  • the latter For the removal of the granulate from the granulating basin 16, the latter has two funnel-shaped depressions 60, 62 in its bottom surface, each with an outflow nozzle 64, 66 and a shut-off valve 68, 70 for closing the outflow nozzle.
  • the granulate collects in these depressions 60, 62 and can be removed by opening the shut-off valves 68, 70.
  • the shut-off valves 68, 70 are preferably pinch valves, i.e. Valves with a membrane which surrounds a through-channel in the valve and constricts this through-channel when a pressure medium is applied to it.
  • a filter connection 72, 74 is arranged in front of each of the shut-off valves 68, 70, via which the decanting basin 16 is dewatered before the granulate is removed. Due to its simplicity and compactness, the described granulating device 12 is particularly well suited for use in an electrical steelworks. It is advantageous here that the electroslag has a relatively high specific weight and consequently settles well in the decanting basin.

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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)
  • Manufacture Of Iron (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

A simple and compact device for wet granulation of liquid slag, comprising a granulating basin with a water injection device and a decanting basin that is separate from the granulating basin. A distribution channel for the granulate-water mixture extends above the decanting basin and is provided with outflow means along the entire length and on the lower side thereof for the granulate-water mixture. A vertical inflow shaft that is open towards the bottom is arranged underneath the distribution channel. The outflow means for the granulate-water mixture discharges into said inflow shaft.

Description

Vorrichtung zum Naßgranulieren von flüssiger Schlacke Device for wet granulation of liquid slag
Einleitungintroduction
Die vorliegende Erfindung betrifft eine Vorrichtung zum Naßgranulieren von flüssiger Schlacke.The present invention relates to a device for wet granulation of liquid slag.
Bei der Naßgranulierung wird ein flüssiger Schlackenstrom in einen kräftigen Wasserstrom eingeleitet, wobei die vom Wasserstrom erfaßte flüssige Schlacke granuliert, verfestigt und abgekühlt wird. Anschließend wird das Granulat entwässert.In wet granulation, a liquid slag stream is introduced into a powerful water stream, the liquid slag caught by the water stream being granulated, solidified and cooled. The granules are then dewatered.
Vorrichtungen zum Naßgranulieren von flüssiger Schlacke sind zum Beispiel aus dem Hochofenbereich bekannt. Sie umfassen ein Granulierbecken mit einer Eindüsvorrichtung für das Granulierwasser, sowie eine Vorrichtung zum Entwässern des Granulats. Klassische Entwässerungsvorrichtungen umfassen ein vom Granulierbecken abgetrenntes Dekantierbecken, in welchem sich das Schlackengranulat absetzt.Devices for wet granulation of liquid slag are known, for example, from the blast furnace sector. They include a pelletizing basin with a spraying device for the pelletizing water and a device for dewatering the pellet. Classic dewatering devices include a decanting basin, separated from the granulating basin, in which the slag granulate settles.
Bei der Naßgranulierung besteht eine nicht vernachläßigbare Explosionsgefahr, sowohl durch Freisetzen von Wasserstoff, als auch durch explosionsar- tiges Überhitzen von Wasserdampf. Um diese Explosionsgefahr zu reduzieren, muß mit sehr großen Wasserströmen gearbeitet werden. Diese großen Wasserströme bedingen natürlich große, platzaufwendige Dekantierbecken.With wet granulation there is a non-negligible risk of explosion, both from the release of hydrogen and from explosive overheating of water vapor. To reduce this risk of explosion, very large water flows must be used. These large water flows naturally require large, space-consuming decanting tanks.
Um solche platzaufwendige Dekantierbecken zu vermeiden, ist es bekannt Entwässerungstrommeln einzusetzen, wie sie zum Beispiel in der US-A- 4,205,855 beschrieben sind. Bei großen Hochöfen machen sich solche Entwässerungstrommeln durch ihre hohe Entwässerungsleistung schnell bezahlt. Für kleinere Schlackenmengen, wie sie zum Beispiel in Elektrostahlwerken anfallen, ist eine Naßgranulierung mit nachgeschalteter Entwässerungstrommel jedoch zu aufwendig.In order to avoid such space-consuming decanting basins, it is known to use drainage drums, such as are described, for example, in US Pat. No. 4,205,855. In large blast furnaces, such drainage drums quickly pay off with their high drainage performance. For smaller quantities of slag, such as those found in electrical steelworks, wet granulation with a downstream dewatering drum is too expensive.
Aufgabe der ErfindungObject of the invention
Der vorliegenden Erfindung liegt die Aufgabe zugrunde eine einfache und zugleich sehr kompakte Vorrichtung zum Naßgranulieren von flüssiger Schlak- ke zu schaffen. Diese Aufgabe wird erfindungsgemäß durch eine Vorrichtung nach Anspruch 1 gelöst.The present invention has for its object a simple and at the same time to create a very compact device for wet granulation of liquid slag. This object is achieved according to the invention by a device according to claim 1.
Allgemeine Beschreibung der ErfindungGeneral description of the invention
Die erfindungsgemäße Vorrichtung zum Naßgranulieren von flüssiger Schlacke umfaßt ein Granulierbecken mit einer Eindüsvorrichtung für das Granulierwasser, ein vom Granulierbecken abgetrenntes Dekantierbecken, in welchem sich die Schlacke als Granulat absetzt, sowie eine Vorrichtung zum Einleiten des Granulat-Wasser-Gemischs aus dem Granulierbecken in das Dekantierbecken. Diese Vorrichtung umfaßt mindestens einen länglichen Verteilerkanal, der sich über das Dekantierbecken erstreckt und an seiner Unterseite über seine Länge verteilte Ausflußmittel für das Granulat-Wasser- Gemisch aufweist. Diese Ausflußmittel können zum Beispiel einen Ausflußschlitz oder mehrere hintereinander angeordnete Ausflußöffnungen umfassen. Im Granulierbecken ist unterhalb des mindestens einen Verteilerkanals ein senkrechter, nach unten offener Einströmschacht angeordnet, in den die Ausflußmittel für das Granulat-Wasser-Gemisch einmünden. Dieser Einströmschacht kann zum Beispiel auf einfache Art und Weise durch zwei am Verteilerkanal befestigte Schirmwände ausgebildet werden. Durch den Verteilerkanal, seine Ausflußmittel und den Einströmschacht kann das Granulat-Wasser- Gemisch weitgehend turbulenzfrei in das Dekantierbecken eingeleitet werden. Hierdurch ist gewährleistet, daß sich das Schlackengranulat auch in relativ kleinen Dekantierbecken zufriedenstellend absetzt. Die vorliegende Erfindung ermöglicht folglich mit äußerst einfachen Mitteln eine kompakte Vorrichtung zum Naßgranulieren von flüssiger Schlacke zu schaffen. Das Dekantierbecken weist an seinem oberen Rand vorteilhaft Überlaufvorrichtungen für das Granulierwasser auf. Über diese Überlaufvorrichtungen wird das "geklärte" Granulierwasser, während dem Granulieren, aus dem Dekantierbecken abgeführt und ggf. der Eindüsvorrichtung im Dekantierbecken wieder zugeführt. In einer bevorzugten Ausführung liegt der Verteilerkanal tiefer als diese Überlaufvorrichtungen und folglich unterhalb des Wasserspiegels im Dekantierbecken.The device according to the invention for the wet granulation of liquid slag comprises a granulating basin with an injection device for the granulating water, a decanting basin separated from the granulating basin, in which the slag settles as granulate, and a device for introducing the granulate-water mixture from the granulating basin into the decanting basin . This device comprises at least one elongated distribution channel which extends over the decanting basin and has on its underside distributed outflow means for the granulate / water mixture over its length. These outflow means can comprise, for example, one outflow slot or a plurality of outflow openings arranged one behind the other. In the pelletizing basin, a vertical, downwardly open inflow shaft is arranged below the at least one distribution channel, into which the outflow means for the pellet-water mixture open. This inflow shaft can be formed in a simple manner, for example, by two screen walls attached to the distribution channel. The granulate-water mixture can be introduced into the decanting basin largely without turbulence through the distribution channel, its outflow means and the inflow shaft. This ensures that the slag granulate settles satisfactorily even in relatively small decanting tanks. The present invention thus makes it possible to create a compact device for wet granulation of liquid slag with extremely simple means. The decanting basin advantageously has overflow devices for the granulating water at its upper edge. The "clarified" pelletizing water, during the pelletizing, is removed from the decanting basin via these overflow devices and, if necessary, returned to the injection device in the decanting basin. In a preferred embodiment, the distribution channel is lower than these overflow devices and consequently below the water level in the Decanting basin.
Für die Entnahme des Granulats aus dem Granulierbecken weist dieses Becken vorteilhaft mindestens eine trichterförmige Vertiefung mit einem Ausflußstutzen und einem Absperrventil zum Verschließen des Ausfiußstutzens auf.For the removal of the granulate from the granulating basin, this basin advantageously has at least one funnel-shaped depression with an outflow nozzle and a shut-off valve for closing the outflow nozzle.
Die Platzausnutzung im Dekantierbecken wird dadurch optimiert, daß der Einströmschacht und die mindestens eine trichterförmige Vertiefung eine gemeinsame Symmetrieebene aufweisen. Eine besonders kompakte Vorrichtung läßt sich dadurch erzielen, daß das Granulierbecken mehrere hintereinan- derliegende trichterförmige Vertiefungen aufweist, wobei der Einströmschacht und die hintereinanderliegenden trichterförmigen Vertiefungen eine gemeinsame Symmetrieebene aufweisenThe use of space in the decanting basin is optimized in that the inflow shaft and the at least one funnel-shaped depression have a common plane of symmetry. A particularly compact device can be achieved in that the granulating basin has a plurality of funnel-shaped depressions one behind the other, the inflow shaft and the funnel-shaped depressions lying one behind the other having a common plane of symmetry
Das Granulierbecken ist vorteilhaft als längliche Wanne, mit einer Bodenfläche, zwei Seitenflächen und zwei Stirnflächen ausgebildet. Die Eindüsvor- richtung für das Granulierwasser ist hierbei an einem ersten Ende dieser Wanne angeordnet, und der mindestens eine Verteilerkanal bildet seine Einmündung in das Granulierbecken am gegenüberliegenden Ende der Wanne aus.The pelletizing tank is advantageously designed as an elongated trough with a bottom surface, two side surfaces and two end surfaces. The injection device for the pelletizing water is arranged at a first end of this trough, and the at least one distributor channel forms its opening into the pelletizing tank at the opposite end of the trough.
In einer bevorzugten Ausführung umfaßt die Eindüsvorrichtung für das Granulierwasser eine Kammer die das erste Ende der Wanne umschließt undIn a preferred embodiment, the injection device for the granulating water comprises a chamber which encloses the first end of the tub and
Auslaßdüsen für das Granulierwasser aufweist. Diese Auslaßdüsen für dasHas outlet nozzles for the granulating water. These outlet nozzles for that
Granulierwasser sind bevorzugt sowohl in den beiden Seitenflächen, als auch in der Stirnfläche am ersten Ende der Wanne angeordnet.Granulating water is preferably arranged both in the two side surfaces and in the end surface at the first end of the tub.
Beschreibung anhand der FigurenDescription based on the figures
Im folgenden wird nun eine Ausgestaltung der Erfindung anhand der bei- liegenden Figuren beschrieben. Es zeigen:An embodiment of the invention will now be described below with reference to the accompanying figures. Show it:
Fig.1 : einen Längsschnitt durch eine erfindungsgemäße Vorrichtung zum Naßgranulieren von flüssiger Schlacke, mit einer Schlackenpfanne in Entleerungstellung; Fig.2: eine Draufsicht auf die Vorrichtung der Figur 1 , ohne Schlackenpfaπne; und Fig.3: einen Querschnitt entlang der Schnittlinie A-A durch die Vorrichtung der Figur 1. In Figur 1 ist mit dem Bezugszeichen 10 eine Schlackenpfanne mit flüssiger Schlacke bezeichnet, welche in einer erfindungsgemäßen Granuliervorrichtung 12 granuliert werden soll. Diese Granuliervorrichtung 12 besteht im wesentlichen aus einem Granulierbecken 14 und einem Dekantierbecken 16, das unmittelbar an das Granulierbecken 14 angebaut ist. Die gezeigte Granuliervorrichtung 12 umfaßt desweiteren eine Schwenkvorrichtung 18 zum Entleeren der Schlackenpfanne 10 in das Granulierbecken 14. Hierbei faßt die Schwenkvorrichtung 18 die Schlackenpfanne 10 an ihren Lagerzapfen 20 und schwenkt sie um eine Schwenkachse 22 in eine Ausschüttstellung über dem hinteren Ende des Granulierbeckens 14, so daß die flüssige Schlacke in das Granulierbecken 14 einlaufen kann. Der Neigungswinkel der Pfanne 10 wird hierbei derart angepaßt, daß ein möglichst konstanter Schlackenstrom in das Granulierbecken 14 einfließt.1 shows a longitudinal section through a device according to the invention for wet granulation of liquid slag, with a slag pan in the emptying position; 2 shows a plan view of the device of FIG. 1, without slag pans; and FIG. 3: a cross section along the section line AA through the device of FIG. 1. In FIG. 1, reference number 10 denotes a slag pan with liquid slag, which is to be granulated in a granulating device 12 according to the invention. This granulating device 12 essentially consists of a granulating basin 14 and a decanting basin 16 which is directly attached to the granulating basin 14. The shown granulating device 12 further comprises a swiveling device 18 for emptying the slag pan 10 into the granulating tank 14. Here, the swiveling device 18 grips the slag pan 10 on its bearing journal 20 and swivels it about a swiveling axis 22 into a dispensing position above the rear end of the granulating tank 14, so that the liquid slag can enter the granulating tank 14. The angle of inclination of the pan 10 is adjusted in such a way that a stream of slag which is as constant as possible flows into the granulating tank 14.
Das Granulierbecken 14 wird durch eine längliche Wanne ausgebildet, welche eine Bodenfläche 24, zwei Seitenflächen 26, 28, sowie eine hintere Stirnfläche 30 und eine vordere Stirnfläche 32 aufweist. Die flüssige Schlacke fließt aus der Schlackenpfanne 10 in das hintere Ende des Granulierbecken 14 ein. Hier ist eine Eindüsvorrichtung für das Granulierwasser in die Wanne eingebaut. Diese Eindüsvorrichtung umfaßt eine Wasserkammer 34, welche die hintere Stirnfläche 30 und den hinteren Abschnitt der beiden Seitenflächen 26 und 28 umgibt. Über Anschlußstutzen 35 wird die Wasserkammer 34 mit dem Granulierwasser beaufschlagt. Über eine Vielzahl von Auslaßöffnungen 36 in der Stirnfläche 30 und den beiden Seitenflächen 26 und 28 strömt das Granulierwasser aus der Wasserkammer 34 in die längliche Wanne des Granuilier- beckens ein. Hierbei sollte eine Einströmgeschwindigkeit in der Größe von ungefähr 10 m/s an den Auslaßöffnungen 36 erzielt werden. Pro kg flüssiger Schlacke sollten hierbei ungefähr 15 kg Wasser in das Granulierbecken 14 eingedüst werden. Im Granulierbecken 14 wird die flüssige Schlacke vom Granulierwasserstrom erfaßt, wobei sie granuliert und sich verfestigt. Je turbulenter das Wasser im Granulierbecken ist, je niedriger das Explosionsrisko durch Freisetzen von Wasserstoff und durch explosionsartiges Überhitzen von Wasserdampf ist. Das Granulierbecken 14 ist mit dem Dekantierbecken 16 über eine Vorrichtung zum Einleiten des Granulat-Wasser-Gemischs in das Dekantierbecken 16 verbunden, welche in den Figuren global mit dem Bezugszeichen 38 bezeichnet ist. Diese Vorrichtung 38 umfaßt mindestens einen röhrenförmigen Verteilerkanal 40, der sich über das Dekantierbecken 16 in Längsrichtung desselben erstreckt. An seiner Unterseite weist dieser Verteilerkanal 40 Ausflußmittel 42 für das Granulat-Wasser-Gemisch auf, die über die Länge des Dekantierbeckens 16 verteilt sind. Diese Ausflußmittei 42 können zum Beispiel einen oder mehre Ausflußschlitze und/oder mehrere hintereinander angeordnete Ausflußöffnungen umfassen. Die Ausflußmittel 42 sollen hierbei derart ausgelegt sein, daß der Granulat-Wasser-Strom aus dem Granulierbecken durch den Verteilerkanal 40 möglichst uniform über die gesamte Länge des Dekantierbeckens 16 verteilt wird. Es bleibt anzumerken, daß der Verteilerkanal 14 mit Gefälle verlegt ist, wobei das obere Ende in der vorderen Stirnwand 32 des Granulierbeckens 14, unmittelbar oberhalb der Bodenfläche 24, eine Einmündung 44 für den Granulat-Wasser-Strom ausbildet. Das untere Ende des Verteilerkanals 14 ist verschlossen und liegt auf einem Tragsockel 45 an dem Dekantierbecken 16 auf. Wie am besten aus Figur 1 ersichtlich, umfaßt das Granulierbecken14 an seiner vorderen Stirnwand 32 einen Überlauf 46, der mittels eines Überlaufrohrs 48 ebenfalls mit dem Verteilerkanal 14 verbunden ist.The granulating basin 14 is formed by an elongated trough which has a bottom surface 24, two side surfaces 26, 28, and a rear end surface 30 and a front end surface 32. The liquid slag flows from the slag pan 10 into the rear end of the granulating basin 14. Here, an injection device for the granulating water is built into the tub. This injection device comprises a water chamber 34 which surrounds the rear end face 30 and the rear section of the two side faces 26 and 28. The water chamber 34 is charged with the pelletizing water via connecting pieces 35. The pelletizing water flows out of the water chamber 34 into the elongated trough of the pelletizing tank through a plurality of outlet openings 36 in the end face 30 and the two side faces 26 and 28. An inflow velocity of approximately 10 m / s should be achieved at the outlet openings 36. About 15 kg of water should be injected into the granulating basin 14 per kg of liquid slag. In the granulating basin 14, the liquid slag is caught by the granulating water stream, where it granulates and solidifies. The more turbulent the water in the pelletizing tank, the lower the explosion risk from the release of hydrogen and from explosive overheating of water vapor. The granulating basin 14 is connected to the decanting basin 16 via a device for introducing the granulate-water mixture into the decanting basin 16, which is designated globally in the figures with the reference symbol 38. This device 38 comprises at least one tubular distribution channel 40 which extends over the decanting basin 16 in the longitudinal direction thereof. On its underside, this distribution channel 40 has outflow means 42 for the granulate-water mixture, which are distributed over the length of the decanting basin 16. These outflow means 42 can comprise, for example, one or more outflow slots and / or several outflow openings arranged one behind the other. The outflow means 42 should be designed in such a way that the granulate-water flow from the granulating basin through the distribution channel 40 is distributed as uniformly as possible over the entire length of the decanting basin 16. It should be noted that the distribution channel 14 is laid with a slope, the upper end in the front end wall 32 of the granulating basin 14, immediately above the bottom surface 24, forming an opening 44 for the granulate-water flow. The lower end of the distribution channel 14 is closed and lies on a support base 45 on the decanting basin 16. As can best be seen from FIG. 1, the granulating basin 14 comprises an overflow 46 on its front end wall 32, which is also connected to the distribution channel 14 by means of an overflow pipe 48.
In Figur 3 erkennt man, daß beidseitig des Verteilerkanals 14 Schirmwände 50, 52 angebracht sind, welche sich in das Dekantierbecken 16 bis weit unter die Ausflußmittel 42 im Verteilerkanal 40 erstrecken. Diese Schirmwände 50, 52 bilden unterhalb des Verteilerkanals 40 einen nach unten offenen senkrechten Einströmschacht 54 aus, in den die Ausflußmittel 42 für das Granulat-Wasser-Gemisch einmünden. Durch den Verteilerkanal 40, seine Ausflußmittel 42 und den Einströmschacht 54 kann das Granulat-Wasser- Gemisch weitgehend turbulenzfrei in das Dekantierbecken 16 eingeleitet werden. Hierdurch ist gewährleistet, daß sich das Schlackengranulat in dem relativ kleinen Dekantierbecken 16 zufriedenstellend absetzt.In FIG. 3 it can be seen that shield walls 50, 52 are attached on both sides of the distribution channel, which extend into the decanting basin 16 to far below the outflow means 42 in the distribution channel 40. These screen walls 50, 52 form below the distribution channel 40 a downwardly open vertical inflow shaft 54, into which the outflow means 42 for the granulate-water mixture open. Through the distribution channel 40, its outflow means 42 and the inflow shaft 54, the granulate water Mixture be introduced into the decanting basin 16 largely without turbulence. This ensures that the slag granulate settles satisfactorily in the relatively small decanting basin 16.
Das Dekantierbecken 16 weist an seinem oberen Rand einen Überlaufka- nal 56 für das Granulierwasser auf. Über diesen Überlaufkanal 56 wird während dem Granulieren das "geklärte" Granulierwasser aus dem Dekantierbecken 16 abgeführt. Man beachtete, daß der Verteilerkanal 40 tiefer und folglich unterhalb des Wasserspiegels 58 im Dekantierbecken 16 liegt. Durch die oben beschriebene erfindungsgemäße Vorrichtung zum Einleiten des Granulat- Wasser-Gemischs in das Dekantierbecken 16 ist gewährleistet, daß die meisten Granulatpartikel sich im Dekantierbecken 16 absetzen, bevor das Granulierwasser in den peripheren Überlaufkanal 56 einströmt. Aus dem Überlaufkanal kann das "geklärte" Granulierwasser wieder in die Eindüsvorrichtung des Granulierbeckens 14 eingespeist werden. Für die Entnahme des Granulats aus dem Granulierbecken 16 weist letzteres in seiner Bodenfläche zwei trichterförmige Vertiefungen 60, 62, mit je einem Ausflußstutzen 64, 66 und einem Absperrventil 68, 70 zum Verschließen des Ausflußstutzens auf. Das Granulat sammelt sich in diesen Vertiefungen 60, 62 und kann durch Öffnen der Absperrventile 68, 70 entnommen werden. Die Absperrventile 68, 70 sind vorzugsweise Quetschventile, d.h. Ventile mit einer Membrane, die einen Durchgangskanal im Ventil umgibt und diesen Durchgangskanal bei Beaufschlagung mit einem Druckmedium zusammenschnürt. Jedem der Absperrventil 68, 70 ist ein Filterstutzen 72, 74 vorgelagert, über den das Dekantierbecken 16, vor Entnahme des Granulats, entwässert wird. Die beschriebene Granuliervorrichtung 12 eignet sich durch ihre Einfachheit und Kompaktheit besonders gut zum Einsatz in einem Elektrostahlwerk. Hierbei ist von Vorteil, daß die Elektroschlacke ein relativ hohes spezifisches Gewicht aufweist und sich folglich gut im Dekantierbecken absetzt. The decanting basin 16 has an overflow channel 56 for the granulating water at its upper edge. The "clarified" granulating water is discharged from the decanting basin 16 via this overflow channel 56 during the granulation. It was noted that the distribution channel 40 lies lower and consequently below the water level 58 in the decanting basin 16. The device according to the invention for introducing the granulate-water mixture into the decanting basin 16 described above ensures that most of the granulate particles settle in the decanting basin 16 before the granulating water flows into the peripheral overflow channel 56. The "clarified" granulating water can be fed back into the injection device of the granulating basin 14 from the overflow channel. For the removal of the granulate from the granulating basin 16, the latter has two funnel-shaped depressions 60, 62 in its bottom surface, each with an outflow nozzle 64, 66 and a shut-off valve 68, 70 for closing the outflow nozzle. The granulate collects in these depressions 60, 62 and can be removed by opening the shut-off valves 68, 70. The shut-off valves 68, 70 are preferably pinch valves, i.e. Valves with a membrane which surrounds a through-channel in the valve and constricts this through-channel when a pressure medium is applied to it. A filter connection 72, 74 is arranged in front of each of the shut-off valves 68, 70, via which the decanting basin 16 is dewatered before the granulate is removed. Due to its simplicity and compactness, the described granulating device 12 is particularly well suited for use in an electrical steelworks. It is advantageous here that the electroslag has a relatively high specific weight and consequently settles well in the decanting basin.

Claims

Patentansprüche claims
1. Vorrichtung zum Naßgranulieren von flüssiger Schlacke, umfassend: ein Granulierbecken (14) mit einer Eindüsvorrichtung für das Granulierwasser; ein vom Granulierbecken (14) abgetrenntes Dekantierbecken (16), in wel- ehern sich die Schlacke als Granulat absetzt; und einer Vorrichtung zum Einleiten des Granulat-Wasser-Gemischs aus dem Granulierbecken (14) in das Dekantierbecken (16); dadurch gekennzeichnet, daß die Vorrichtung zum Einleiten des Granulat-Wasser-Gemischs aus dem Granulierbecken (14) in das Dekantierbecken (16) mindestens einen länglichen Verteilerkanal (40) umfaßt, der sich über das Dekantierbecken (16) erstreckt, wobei der Verteilerkanal (40) an seiner Unterseite über seine Länge verteilte Ausflußmittel (42) für das Granulat-Wasser-Gemisch aufweist; und daß im Dekantierbecken (16) unterhalb des mindestens einen Verteilerkanals (40) ein senkrechter, nach unten offener Einströmschacht (54) ausgebildet ist, in den die Ausflußmittel (42) für das Granulat-Wasser-Gemisch einmünden.Claims 1. An apparatus for wet granulating liquid slag, comprising: a granulating basin (14) with an injection device for the granulating water; a decanting basin (16) separated from the granulating basin (14), in which the slag settles as granulate; and a device for introducing the granulate-water mixture from the granulating basin (14) into the decanting basin (16); characterized in that the device for introducing the granulate-water mixture from the granulating basin (14) into the decanting basin (16) comprises at least one elongated distribution channel (40) which extends over the decanting basin (16), the distribution channel (40 ) on its underside over its length distributed outflow means (42) for the granulate-water mixture; and that a vertical, downwardly open inflow shaft (54) is formed in the decanting basin (16) below the at least one distribution channel (40), into which the outflow means (42) for the granulate-water mixture open.
2. Vorrichtung nach Anspruch 1 , dadurch gekennzeichnet, daß das Dekantier- becken (16) an seinem oberen Rand Überlaufvorrichtungen (56) für das2. Device according to claim 1, characterized in that the decanting basin (16) at its upper edge overflow devices (56) for the
Granulierwasser aufweist.Has granulating water.
3. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß der Verteilerkanal (40) tiefer als die Überlaufvorrichtungen (56) liegt.3. Apparatus according to claim 2, characterized in that the distribution channel (40) is lower than the overflow devices (56).
4. Vorrichtung nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß der Einströmschacht (54) durch zwei am Verteilerkanal (40) befestigte4. Device according to one of claims 1 to 3, characterized in that the inflow shaft (54) by two on the distribution channel (40) attached
Schirmwände (50, 52) ausgebildet wird.Screen walls (50, 52) is formed.
5. Vorrichtung nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß das Granulierbecken (14) mindestens eine trichterförmige Vertiefung (60, 62) mit einem Ausflußstutzen (64, 66) für das Granulat und einem Absperrventil (68, 70) zum Verschließen des Ausflußstutzens (64, 66) aufweist.5. Device according to one of claims 1 to 4, characterized in that the granulating basin (14) has at least one funnel-shaped depression (60, 62) with an outflow nozzle (64, 66) for the granules and a shut-off valve (68, 70) for closing the outflow nozzle (64, 66).
6. Vorrichtung nach Anspruch 5, dadurch gekennzeichnet, daß dem Absperr- ventil ein Filterstutzen (72, 74) zum Entwässern des Granulats vorgelagert ist.6. The device according to claim 5, characterized in that the shut-off valve is upstream of a filter socket (72, 74) for dewatering the granules.
7. Vorrichtung nach Anspruch 5 oder 6, dadurch gekennzeichnet, daß das Granulierbecken (14) mindestens zwei hintereinanderliegende, trichterförmige Vertiefungen (60, 62) aufweist, wobei der Einströmschacht (54) und die mindestens zwei hintereinanderliegenden, trichterförmigen Vertiefungen (60,7. The device according to claim 5 or 6, characterized in that the granulating basin (14) has at least two funnel-shaped depressions (60, 62) one behind the other, the inflow shaft (54) and the at least two funnel-shaped depressions (60,
62) eine gemeinsame Symmetrieebene aufweisen.62) have a common plane of symmetry.
8. Vorrichtung nach einem der Ansprüche 1 bis 7, dadurch gekennzeichnet, daß das Granulierbecken (14) als längliche Wanne, mit einer Bodenfläche (24), zwei Seitenflächen (26, 28) und zwei Stirnflächen (30, 32) ausgebildet ist, wobei die Eindüsvorrichtung für das Granulierwasser an einem ersten8. Device according to one of claims 1 to 7, characterized in that the granulating tank (14) is designed as an elongated trough, with a bottom surface (24), two side surfaces (26, 28) and two end faces (30, 32), wherein the injection device for the granulating water at a first
Ende dieser Wanne angeordnet ist, und der mindestens eine Verteilerkanal (40) eine Einmündung in das Granulierbecken (14) am gegenüberliegenden Ende der Wanne ausbildet.The end of this trough is arranged, and the at least one distribution channel (40) forms an opening into the granulating basin (14) at the opposite end of the trough.
9. Vorrichtung nach Anspruch 8, dadurch gekennzeichnet, daß die Eindüsvor- richtung für das Granulierwasser am ersten Ende der Wanne eine Vielzahl von Auslaßdüsen (36) in den beiden Seitenflächen (26, 28) und in der Stirnfläche (30) der Wanne aufweist.9. The device according to claim 8, characterized in that the injection device for the granulating water at the first end of the trough has a plurality of outlet nozzles (36) in the two side surfaces (26, 28) and in the end face (30) of the trough.
10. Vorrichtung nach einem der Ansprüche 1 bis 9, dadurch gekennzeichnet, daß die Ausflußmittel (42) einen Ausflußschlitz oder mehrere hintereinander angeordnete Ausflußöffnungen umfassen. 10. Device according to one of claims 1 to 9, characterized in that the outflow means (42) comprise an outflow slot or a plurality of outflow openings arranged one behind the other.
EP99929210A 1998-06-26 1999-06-15 Device for wet granulation of liquid-slag Expired - Lifetime EP1097245B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
LU90255 1998-06-26
LU90255A LU90255B1 (en) 1998-06-26 1998-06-26 Device for the wet granulation of liquid slag
PCT/EP1999/004111 WO2000000649A1 (en) 1998-06-26 1999-06-15 Method for wet granulation of liquid-slag

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EP1097245A1 true EP1097245A1 (en) 2001-05-09
EP1097245B1 EP1097245B1 (en) 2003-01-29

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LU90346B1 (en) * 1999-02-08 2000-08-09 Wurth Paul Sa Plant for aqueous granulation
DE10148152B4 (en) * 2001-09-28 2010-04-08 Egon Evertz Kg (Gmbh & Co.) Method and apparatus for cooling ladle and converter slags
KR101147876B1 (en) 2004-07-14 2012-07-02 파울 부르쓰 소시에떼 아노님 Process and apparatus for granulating a melt
CN1312295C (en) * 2005-06-23 2007-04-25 天津市隆安冶金机械厂 Blast furnace slag flushing technology by pneumatic lifting runner and its flushing device
JP6414123B2 (en) * 2016-03-31 2018-10-31 Ｊｆｅスチール株式会社 Slurry distributor
CN109338121A (en) * 2018-10-30 2019-02-15 铜陵有色金属集团股份有限公司金冠铜业分公司 Turn over packet platform lock bag apparatus
CN111575420B (en) * 2020-07-06 2022-02-18 付光明 Environment-friendly energy-saving blast furnace slag treatment method and special treatment equipment

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US2210999A (en) * 1937-12-20 1940-08-13 Bartholomew Tracy Production of dry granulated slag
DE1458808A1 (en) * 1965-11-05 1969-02-06 Acieries Et Minieres De La Sam Method and device for granulating slag
DE2157653C3 (en) * 1971-11-20 1974-05-22 Knapsack Ag, 5033 Huerth-Knapsack Process for granulating a molten mixture of phosphorus furnace slag and ferrophosphorus

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EP1097245B1 (en) 2003-01-29
WO2000000649A1 (en) 2000-01-06
CN1218052C (en) 2005-09-07
CN1305533A (en) 2001-07-25
AU743721B2 (en) 2002-01-31
AU4610399A (en) 2000-01-17
ATE231923T1 (en) 2003-02-15
LU90255B1 (en) 2000-01-03
CA2334197C (en) 2008-08-12
US6516632B1 (en) 2003-02-11
BR9911391A (en) 2001-03-13
ZA200007698B (en) 2001-06-21
DE59904173D1 (en) 2003-03-06
JP2003520290A (en) 2003-07-02

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