EP0683824A1 - Process and device for granulating and crushing molten materials and grinding stocks - Google Patents

Process and device for granulating and crushing molten materials and grinding stocks

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Publication number
EP0683824A1
EP0683824A1 EP95901265A EP95901265A EP0683824A1 EP 0683824 A1 EP0683824 A1 EP 0683824A1 EP 95901265 A EP95901265 A EP 95901265A EP 95901265 A EP95901265 A EP 95901265A EP 0683824 A1 EP0683824 A1 EP 0683824A1
Authority
EP
European Patent Office
Prior art keywords
diffuser
mixing chamber
water
slag
steam
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
EP95901265A
Other languages
German (de)
French (fr)
Other versions
EP0683824B1 (en
Inventor
Alfred Edlinger
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Holcim Ltd
Original Assignee
Holderbank Financiere Glarus AG
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 Holderbank Financiere Glarus AG filed Critical Holderbank Financiere Glarus AG
Publication of EP0683824A1 publication Critical patent/EP0683824A1/en
Application granted granted Critical
Publication of EP0683824B1 publication Critical patent/EP0683824B1/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
    • C21B2400/074—Tower structures for cooling, being confined but not sealed

Definitions

  • the invention relates to a ner driving for granulating and comminuting molten material and regrind, and to a device for granulating and comminuting blast furnace slag, clinker or the like, in which molten slag is cooled with water to form a glass phase.
  • Molten blast furnace slag is usually granulated with the help of water in order to obtain an amorphous product which is in the glass phase, i.e. a metastable phase.
  • a product can be added to cements as a hydraulically active component. With such a procedure, the heat of fusion of the melt flow is converted into a low-temperature heat of water and cannot be used any further.
  • the heat of slag melting is used thermodynamically and technically only to a very small fraction, the energy originally contained being used essentially to convert the energy originally contained in the form of the metastable Save the glass phase of the end product, and prevent conversion to a stable crystalline state.
  • the invention now aims to provide a method of the type mentioned at the outset with which the heat of fusion of slags is thermodynamically significantly better to use and to design the usually required grinding effort in the event of further use as a cement aggregate or for grinding clinker for the production of cement in terms of energy efficiency.
  • the object of the inventive method is essentially that the melt is brought into a mixing chamber with compressed air, that water, steam and / or air / water mixtures are injected into the mixing chamber and that the evaporated water together with the solidified slag
  • a diffuser is ejected.
  • the fact that the melt is introduced into a mixing chamber with compressed air and water, water vapor and / or air / water mixtures are injected into the mixing chamber results in a rapidly expanding dispersion of solidifying molten material, whereby
  • the expanding gas stream is expelled through a diffuser.
  • the gas flow entrains the particles solidified into amorphous slag glass with an extreme increase in volume, the thermal energy being converted into kinetic energy which causes a directed flow of the formed
  • the pressure in the mixing chamber essentially corresponds to the flow losses of the strongly superheated steam formed.
  • the heat of the slag is mainly converted into flow energy, and the amorphous slag
  • the high kinetic energy can subsequently be used directly for the comminution of oversize grain, for which the method is advantageously carried out in such a way that the exit jet of the diffuser hits a baffle plate or an exit jet
  • n of another diffuser is directed. Due to the collision with further particle streams flowing out with high kinetic energy, or else with a baffle plate, the kinetic energy is used to reduce the energy expenditure for the grinding process, and there is thus a much more extensive use of those contained in the melt Heat than was the case with known methods. Due to the rapid increase in volume and the resulting expansion in the direction of the outlet opening of the steam diffuser, a negative pressure can be formed in the region of the maximum flow rate, so that the metering of additives is made possible here using an injector effect. The process according to the invention is thus advantageously carried out in such a way that further regrind or additives are introduced between the mixing chamber and the diffuser via an injector.
  • the heterogeneous fluid which consists of a mixture of water vapor and solid particles, flows through the steam diffuser, whereby the flow velocity is reduced accordingly in order to avoid uncontrolled further expansion after the diffuser ignition, the process is advantageously carried out in such a way that the exit velocity of the steam jet from the diffuser is set to be less than the speed of sound.
  • the steam formed in the process according to the invention has a significantly higher temperature level than conventional slag granulating devices, and the steam temperature can be recovered in a conventional manner.
  • the procedure is such that the steam formed is drawn off and passed through a heat exchanger, and that the condensate is returned to the mixing chamber, so that the water used can also be circulated.
  • the device according to the invention consists essentially in that a line for molten slag is connected to a mixing chamber, that lines for water, water vapor and / or water / air mixtures open into the mixing chamber, that a diffuser is connected to the mixing chamber, and that the outlet opening baffles or further outlet openings for accelerated particles, the axis of which intersect the axis of the outlet opening of the diffuser, are arranged.
  • the blast furnace slag granulate formed can with such a device not only in the amorphous glass phase are solidified, but at the same time, using the kinetic energy resulting from the thermal energy by conversion, are comminuted to such an extent that a further grinding process can be omitted.
  • the thermodynamic energy of the slag melt is thus also immediately used for the grinding process.
  • the device according to the invention is further developed so that the line for molten slag over
  • the water jet can be pushed radially into the mixing chamber, for example.
  • the design is such that an injector chamber with a smaller effective cross-section than the outlet opening of the diffuser is arranged between the mixing chamber and the diffuser, to which a line for further regrind or additives is connected, so that under
  • the design is advantageously made such that a steam suction device is arranged after the outlet opening of the diffuser, the steam suction line with at least one heat exchanger connected to what that
  • FIG. 1 denotes a slag melting vessel, from which a slag melt 2 is drawn off via a tap opening 3.
  • the tap opening 3 opens via an annular nozzle 4 into a mixing chamber 5 of the device according to the invention for granulating and comminuting the slag, which is designated 6 overall.
  • Compressed air is introduced into the ring nozzle 4 via an external annular channel 7, as a result of which a homogeneous dispersion of the slag jet in the mixing chamber 5 is achieved.
  • Lines 8 for pressurized water also lead to the c mixing chamber 5.
  • the pressure water pushed into the mixing chamber 5 via the lines 8 expands at high speed and can flow out in the direction of the arrow 9.
  • flow energy is imparted to the granulated particles, so that the particle stream with the steam can leave the outlet opening 10 of a steam diffuser 11 at high speed and thus high kinetic energy of the particles contained.
  • a storage container 14 is provided for the metered introduction of additives or additives, and a dosing screw 15 is arranged in the feed channel to the injector chamber.
  • a further diffuser mouth 16 of a further steam diffuser 17 is indicated schematically, to which another device, essentially the same as the device 6, is connected.
  • the axes 18 and 19 of the particle streams leaving the diffusers 11 and 17 intersect one another in a granulate comminution section, indicated schematically by 20, whereby an intensive conversion of kinetic energy as grinding energy takes place, whereby the particles are further comminuted.
  • the baffle plate designated by 21 also serves the same purpose, onto which the particle streams, possibly deflected by particles from the second unit in each case, impact and are comminuted using the remaining kinetic energy.
  • the ground material designated 22 can be used directly as cement or cement aggregate, oversize which may still be present can be returned to the injector chamber 12 via the line 13.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Disintegrating Or Milling (AREA)
  • Manufacture Of Iron (AREA)
  • Processing Of Solid Wastes (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)
  • Crushing And Pulverization Processes (AREA)
  • Furnace Details (AREA)
  • Glanulating (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Control And Other Processes For Unpacking Of Materials (AREA)

Abstract

PCT No. PCT/AT94/00185 Sec. 371 Date Aug. 31, 1995 Sec. 102(e) Date Aug. 31, 1995 PCT Filed Dec. 1, 1994 PCT Pub. No. WO95/15402 PCT Pub. Date Jun. 8, 1995A molten melt of slag and grinding material is introduced into a mixing chamber to which a cooling and mixing agent is injected, the agent being compressed air, water or an air/water mixture which serves to cool the melt and form vapor and solidified particles. These are passed through a diffuser and are discharged as a jet which is directed to particle disintegrating means.

Description

Nerfahren zum Granulieren und Zerkleinern von schmelzflüssigem Material und Mahlσut sowie Einrichtung zur Durchführung dieses VerfahrensNerfahren for granulating and crushing molten material and grinding material and device for carrying out this method
Die Erfindung bezieht sich auf ein Nerfahren zum Granulieren und Zerkleinern von schmelzflüssigem Material und Mahlgut, sowie auf eine Einrichtung zum Granulieren und Zerkleinern von Hochofenschlacke, Klinker od.dgl., bei welcher schmelzflüssige Schlacke mit Wasser unter Ausbildung einer Glasphase abgekühlt wird.The invention relates to a ner driving for granulating and comminuting molten material and regrind, and to a device for granulating and comminuting blast furnace slag, clinker or the like, in which molten slag is cooled with water to form a glass phase.
Schmelzflüssige Hochofenschlacke wird überlicherweise mit Hil¬ fe von Wasser granuliert, um ein amorphes Produkt zu erhalten, welches in der Glasphase, d.h. einer metastabilen Phase er- starrt. Nach einem Mahlvorgang kann ein derartiges Produkt als hydraulisch aktive Komponente Zementen zugemischt werden. Die Schmelzwärme des Schmelzflusses wird bei einer derartigen Ver¬ fahrensweise in eine Niedertemperaturwärme von Wasser überge¬ führt und ist nicht weiter nutzbar.Molten blast furnace slag is usually granulated with the help of water in order to obtain an amorphous product which is in the glass phase, i.e. a metastable phase. After a grinding process, such a product can be added to cements as a hydraulically active component. With such a procedure, the heat of fusion of the melt flow is converted into a low-temperature heat of water and cannot be used any further.
Auch bei der Abkühlung von schmelzflüssigen Stahlschlacken wird üblicherweise die Wärme über Strahlungs- und Konvektions- vorgänge mit der Umgebungsluft gekühlt. Auch eine derartige Abwärme ist technisch nicht ohne weiteres nutzbar.When cooling molten steel slags, the heat is usually cooled with the ambient air using radiation and convection processes. Such waste heat is also not technically usable.
Insgesamt wird bei allen bekannten Granulations- bzw. Abkühl¬ verfahren für Schlacken die Schlackenschmelzwärme thermody- namisch und technisch nur zu einem überaus geringen Bruchteil ausgenützt, wobei die ursprünglich enthaltene Energie im we¬ sentlichen dafür verwendet wird, die ursprünglich enthaltene Energie in Form der metastabilen Glasphase des Endproduktes zu speichern, und eine Umwandlung in einen stabilen kristallinen Zustand zu verhindern.Overall, in all known granulation and cooling processes for slags, the heat of slag melting is used thermodynamically and technically only to a very small fraction, the energy originally contained being used essentially to convert the energy originally contained in the form of the metastable Save the glass phase of the end product, and prevent conversion to a stable crystalline state.
Die Erfindung zielt nun darauf ab, ein Verfahren der eingangs genannten Art zu schaffen, mit welchem es gelingt, die Schmelzwärme von Schlacken thermodynamisch wesentlich besser zu nutzen und den überlicherweise erforderlichen Mahlaufwand für den Fall einer Weiterverwendung als Zementzuschlagstoff bzw. für das Aufmahlen von Klinker für die Herstellung von Zement energetisch günstiger zu gestalten. Zur Lösung dieserThe invention now aims to provide a method of the type mentioned at the outset with which the heat of fusion of slags is thermodynamically significantly better to use and to design the usually required grinding effort in the event of further use as a cement aggregate or for grinding clinker for the production of cement in terms of energy efficiency. To solve this
5 Aufgabe besteht das erfindungsgemäße Verfahren im wesentlichen darin, daß die Schmelze mit Preßluft in eine Mischkammer ein¬ gebracht wird, daß in die Mischkammer Wasser, Wasserdampf und/oder Luft-/Wassergemische eingedüst werden und daß das verdampfte Wasser gemeinsam mit der erstarrten Schlacke überThe object of the inventive method is essentially that the melt is brought into a mixing chamber with compressed air, that water, steam and / or air / water mixtures are injected into the mixing chamber and that the evaporated water together with the solidified slag
10 einen Diffusor ausgestoßen wird. Dadurch, daß die Schmelze mit Preßluft in eine Mischkammer eingebracht wird und in die Mischkammer Wasser, Wasserdampf und/oder Luft-/Wassergemische eingedüst werden, entsteht eine sich rasch expandierende Dispersion von erstarrendem schmelzflüssigem Material, wobei10 a diffuser is ejected. The fact that the melt is introduced into a mixing chamber with compressed air and water, water vapor and / or air / water mixtures are injected into the mixing chamber results in a rapidly expanding dispersion of solidifying molten material, whereby
15 der expandierende Gasstrom über einen Diffusor ausgestoßen wird. Der Gasstrom reißt hiebei die zu amorphem Schlackenglas erstarrten Partikel unter extremer Volumszunahme mit sich, wobei die thermische Energie in eine kinetische Energie umgewandelt wird, welche eine gerichtete Strömung des gebil-15 the expanding gas stream is expelled through a diffuser. The gas flow entrains the particles solidified into amorphous slag glass with an extreme increase in volume, the thermal energy being converted into kinetic energy which causes a directed flow of the formed
20 deten granulierten Materials ermöglicht. Der Druck in der Mischkammer entspricht hiebei im wesentlichen den Strö¬ mungsverlusten des gebildeten, stark überhitzten Wasser¬ dampfes. Die Schlackenwärme wird hauptsächlich in Strömungs¬ energie umgewandelt, und es werden die amorphen Schlacken-20 of the granulated material. The pressure in the mixing chamber essentially corresponds to the flow losses of the strongly superheated steam formed. The heat of the slag is mainly converted into flow energy, and the amorphous slag
25 glaspartikel mit der Strömung mitgerissen. Die hohe kinetische Energie kann in der Folge unmittelbar für die Zerkleinerung von zu großem Korn herangezogen werden, wofür mit Vorteil das Verfahren so durchgeführt wird, daß der Austrittsstrahl des Diffusors gegen eine Prallplatte oder einen Austrittsstrahl25 glass particles entrained with the flow. The high kinetic energy can subsequently be used directly for the comminution of oversize grain, for which the method is advantageously carried out in such a way that the exit jet of the diffuser hits a baffle plate or an exit jet
_,n eines weiteren Diffusors gerichtet wird. Durch die Kollision mit weiteren mit hoher kinetischen Energie ausströmenden Partikelströmen, oder aber mit einer Prallplatte, erfolgt eine Ausnutzung der kinetischen Energie zur Verringerung des Ener¬ gieaufwandes für den Mahlvorgang, und es erfolgt somit eine wesentlich weitergehende Nutzung der in der Schmelze enthal- 35 tenen Wärme, als dies mit bekannten Verfahren der Fall war. Aufgrund der raschen Volumszunähme und der daraus resul¬ tierenden Expansion in Richtung der Austrittsöffnung des Dampfdiffusors kann im Bereich der maximalen Strömungs¬ geschwindigkeit ein Unterdruck ausgebildet werden, sodaß an dieser Stelle die Dosierung von Additiven unter Ausnutzung einer Injektorwirkung ermöglicht wird. Mit Vorteil wird somit das erfindungsgemäße Verfahren so durchgeführt, daß zwischen Mischkammer und Diffusor über einen Injektor weiteres Mahlgut oder Additive eingebracht werden. Im Anschluß hieran durch- strömt das heterogene Fluid, welches aus einem Gemisch von Wasserdampf und Feststoffpartikeln besteht, den Dampfdiffusor, wodurch die Strömungsgeschwindigkeit entsprechend reduziert wird, um ein unkontrolliertes Weiterexpandieren nach der Diffusor ündung zu vermeiden, wird mit Vorteil das Verfahren so durchgeführt, daß die Austrittsgeschwindigkeit des Dampf- Strahles aus dem Diffusor kleiner als die Schallgeschwin¬ digkeit eingestellt wird._, n of another diffuser is directed. Due to the collision with further particle streams flowing out with high kinetic energy, or else with a baffle plate, the kinetic energy is used to reduce the energy expenditure for the grinding process, and there is thus a much more extensive use of those contained in the melt Heat than was the case with known methods. Due to the rapid increase in volume and the resulting expansion in the direction of the outlet opening of the steam diffuser, a negative pressure can be formed in the region of the maximum flow rate, so that the metering of additives is made possible here using an injector effect. The process according to the invention is thus advantageously carried out in such a way that further regrind or additives are introduced between the mixing chamber and the diffuser via an injector. Following this, the heterogeneous fluid, which consists of a mixture of water vapor and solid particles, flows through the steam diffuser, whereby the flow velocity is reduced accordingly in order to avoid uncontrolled further expansion after the diffuser ignition, the process is advantageously carried out in such a way that the exit velocity of the steam jet from the diffuser is set to be less than the speed of sound.
Der im Rahmen des erfindungsgemäßen Verfahrens gebildete Dampf besitzt ein gegenüber herkömmlichen Schlackengranulierein- richtungen wesentlich höheres Temperaturniveau, und die Dampf- temperatur kann in konventioneller Weise rückgewonnen werden. Mit Vorteil wird hiezu so vorgegangen, daß der gebildete Dampf abgezogen und über einen Wärmetauscher geführt wird, und daß das Kondensat der Mischkammer rückgeführt wird, sodaß auch das verwendete Wasser im Kreislauf geführt werden kann.The steam formed in the process according to the invention has a significantly higher temperature level than conventional slag granulating devices, and the steam temperature can be recovered in a conventional manner. Advantageously, the procedure is such that the steam formed is drawn off and passed through a heat exchanger, and that the condensate is returned to the mixing chamber, so that the water used can also be circulated.
Die erfindungsgemäße Einrichtung besteht im wesentlichen darin, daß eine Leitung für schmelzflüssige Schlacke mit einer Mischkammer verbunden ist, daß in die Mischkammer Leitungen für Wasser, Wasserdampf und/oder Wasser-/Luftgemische münden, daß an die Mischkammer ein Diffusor angeschlossen ist, und daß an die Austrittsöffnung Prallfächen oder weitere Austritts¬ öffnungen für beschleunigte Teilchen, deren Achse die Achse der Austrittsöffnung des Diffusors schneiden, angeordnet sind. Das gebildete Hochofenschlackegranulat kann mit einer der¬ artigen Einrichtung nicht nur in der amorphen Glasphase erstarrt werden, sondern auch gleichzeitig unter Ausnutzung der aus der thermischen Energie durch Umwandlung entstandenen kinetischen Energie soweit zerkleinert werden, daß ein weiterer Mahlvorgang entfallen kann. Es wird somit unmittelbar 5 die thermodynamische Energie der Schlackenschmelze auch für den Mahlvorgang nutzbar gemacht.The device according to the invention consists essentially in that a line for molten slag is connected to a mixing chamber, that lines for water, water vapor and / or water / air mixtures open into the mixing chamber, that a diffuser is connected to the mixing chamber, and that the outlet opening baffles or further outlet openings for accelerated particles, the axis of which intersect the axis of the outlet opening of the diffuser, are arranged. The blast furnace slag granulate formed can with such a device not only in the amorphous glass phase are solidified, but at the same time, using the kinetic energy resulting from the thermal energy by conversion, are comminuted to such an extent that a further grinding process can be omitted. The thermodynamic energy of the slag melt is thus also immediately used for the grinding process.
Mit Vorteil ist die erfindungsgemäße Einrichtung so weiter¬ gebildet, daß die Leitung für schmelzflüssige Schlacke überAdvantageously, the device according to the invention is further developed so that the line for molten slag over
10 einen mit Preßluft beaufschlagbaren Düsenstock mit Ringdüsen in die Mischkammer mündet, wodurch eine bessere Dispersion in der Mischkammer, welche als Granulierverdampfer ausgebildet ist, erzielt werden kann. Die feine Dispersion, die durch die Beaufschlagung mit Preßluft erzielt wird, erlaubt es,10 opens a nozzle block with pressurized air with ring nozzles into the mixing chamber, whereby a better dispersion in the mixing chamber, which is designed as a pelletizing evaporator, can be achieved. The fine dispersion that is achieved by the application of compressed air allows
15 wesentlich einfachere Einrichtungen für das Einbringen von Druckwasser bzw. Dampf vorzusehen, wobei der Wasserstrahl beispielsweise radial in die Mischkammer eingestoßen werden kann.To provide 15 much simpler devices for introducing pressurized water or steam, the water jet can be pushed radially into the mixing chamber, for example.
20 Mit Vorteil ist die Ausbildung so getroffen, daß zwischen Mischkammer und Diffusor eine Injektorkammer mit gegenüber der Austrittsöffnung des Diffusors geringerem wirksamen Querschnitt angeordnet ist, an welche eine Leitung für weiteres Mahlgut oder Additive angeschlossen ist, sodaß unter20 Advantageously, the design is such that an injector chamber with a smaller effective cross-section than the outlet opening of the diffuser is arranged between the mixing chamber and the diffuser, to which a line for further regrind or additives is connected, so that under
25 Ausnutzung der Injektorwirkung unmittelbar ein Ansaugen oder ein dosiertes Einbringen von Additiven oder weiterem Mahlgut in die erfindungsgemäße Einrichtung möglich wird.25 Exploitation of the injector effect, a suction or a metered introduction of additives or further regrind into the device according to the invention is possible.
Für die Rückgewinnung der fühlbaren und latenten Wärme des 30 Dampfes und für die Führung des für die Granulation erfor¬ derlichen Wassers im Kreislauf ist mit Vorteil die Ausbildung so getroffen, daß nach der Austrittsöffnung des Diffusors eine Dampfabsaugeinrichtung angeordnet ist, die Dampfabsaugleitung mit wenigstens einem Wärmetauscher verbunden ist, worauf dasFor the recovery of the sensible and latent heat of the steam and for the circulation of the water required for the granulation in the circuit, the design is advantageously made such that a steam suction device is arranged after the outlet opening of the diffuser, the steam suction line with at least one heat exchanger connected to what that
- ό,,b- Kondensat über eine Pumpe der Mischka mer rückführbar ist. Gerade die Möglichkeit, innerhalb der erfindungsgemäßen Einrichtung aufgrund der hohen kinetischen Energie einen Mahl¬ vorgang mit der kinetischen Energie der Teilchen vorzunehmen, bietet den besonderen Vorteil, daß ggf. noch verbleibendes Überkorn im Kreislauf in die erfindungsgemäße Einrichtung zur weiteren Zerkleinerung rückgeführt wird. Zu diesem Zweck kann die bereits oben erwähnte Injektorwirkung in vorteilhafter Weise ausgnützt werden, wobei mit Vorteil die Ausbildung so getroffen ist, daß dem Diffusor eine Sieb- oder Sichtein- 0 richtung nachgeschaltet ist und daß der Siebüberlauf bzw. das Überkorn über eine Fördereinrichtung in die Injektionskammer rüc führbar ist.- ό ,, b- condensate can be recycled via a pump in the mixing chamber. It is precisely the possibility of carrying out a grinding operation with the kinetic energy of the particles within the device according to the invention due to the high kinetic energy, which offers the particular advantage that any oversize particles remaining in the circuit are returned to the device according to the invention for further comminution. For this purpose, the above-mentioned injector effect can be exploited in an advantageous manner, the design advantageously being such that a sieve or classifying device is connected downstream of the diffuser and that the sieve overflow or oversize is conveyed into the Injection chamber is feasible.
Die Erfindung wird nachfolgend anhand eines in der Zeichnung 5 schematisch dargestellten Ausführungsbeispieles näher erläu¬ tert. In der Zeichnung ist mit 1 ein Schlackenschmelzgefäß be¬ zeichnet, aus welchem eine Schlackenschmelze 2 über eine Ab¬ stichöffnung 3 abgezogen wird. Die Abstichöffnung 3 mündet über eine Ringdüse 4 in eine Mischkammer 5 der erfindungs- 0 gemäßen Einrichtung zum Granulieren und Zerkleinern der Schlacke, welche insgesamt mit 6 bezeichnet ist. In der Ring¬ düse 4 wird über einen außenliegenden ringförmigen Kanal 7 Preßluft eingebracht, wodurch eine homogene Dispersion des Schlackenstrahles in der Mischkammer 5 erzielt wird. An die c Mischkammer 5 münden weiters Leitungen 8 für Druckwasser. Das über die Leitungen 8 in die Mischkammer 5 eingestoßene Druck¬ wasser expandiert mit hoher Geschwindigkeit und kann in Rich¬ tung des Pfeiles 9 ausströmen. Bei diesem Ausströmvorgang in Richtung des Pfeiles 9 wird den granulierten Teilchen Strδ- « mungsenergie mitgegeben, sodaß der Teilchenstrom mit dem Dampf die Austrittsöffnung 10 eines Dampfdiffusors 11 mit hoher Geschwindigkeit, und damit hoher kinetischer Energie der ent¬ haltenen Teilchen verlassen kann. Auf dem Weg zwischen Misch¬ kammer 5 und dem Dampfdiffusor 11 ist ein Bereich 12 mit ver¬ ringertem Querschnitt vorgesehen, in welchem sich bei gleich¬ zeitig maximaler Strömungsgeschwindigkeit ein Unterdruck aus¬ bilden kann, sodaß über eine Leitung 13 weiteres Mahlgut oder Zuschlagstoffe bzw. Additive nach dem Injektorprinzip ange¬ saugt werden können. Zur dosierten Einbringung von Zuschlag¬ stoffen bzw. Zumahlstoffen ist ein Vorratsbehälter 14 vorge¬ sehen, und es ist eine Dosierschnecke 15 im Zufuhrkanal zur Injektorkammer angeordnet.The invention is explained in more detail below on the basis of an exemplary embodiment shown schematically in drawing 5. In the drawing, 1 denotes a slag melting vessel, from which a slag melt 2 is drawn off via a tap opening 3. The tap opening 3 opens via an annular nozzle 4 into a mixing chamber 5 of the device according to the invention for granulating and comminuting the slag, which is designated 6 overall. Compressed air is introduced into the ring nozzle 4 via an external annular channel 7, as a result of which a homogeneous dispersion of the slag jet in the mixing chamber 5 is achieved. Lines 8 for pressurized water also lead to the c mixing chamber 5. The pressure water pushed into the mixing chamber 5 via the lines 8 expands at high speed and can flow out in the direction of the arrow 9. During this outflow process in the direction of arrow 9, flow energy is imparted to the granulated particles, so that the particle stream with the steam can leave the outlet opening 10 of a steam diffuser 11 at high speed and thus high kinetic energy of the particles contained. On the path between the mixing chamber 5 and the steam diffuser 11 there is an area 12 with a reduced cross section, in which a vacuum can form at the same time as the maximum flow rate, so that further regrind or Additives or additives can be sucked in according to the injector principle. A storage container 14 is provided for the metered introduction of additives or additives, and a dosing screw 15 is arranged in the feed channel to the injector chamber.
Am Mündungsende 10 des Dampfdiffusors ist eine weitere Diffu- sormündung 16 eines weiteren Dampfdiffusors 17 schematisch an¬ gedeutet, an welche sich eine weitere, der Einrichtung 6 im wesentlichen gleiche Einrichtung anschließt. Die Achsen 18 und 19 der die Diffusoren 11 bzw. 17 verlassenden Partikelströme schneiden einander in einer schematisch mit 20 angedeuteten GranulatZerkleinerungssektion, wodurch eine intensive Umset¬ zung von kinetischer Energie als Mahlenergie erfolgt, wodurch die Partikel weiter zerkleinert werden. Dem gleichen Zweck dient auch die mit 21 bezeichnete Prallplatte, auf welche die Partikelströme ggf. durch Partikel aus der jeweils zweiten Einheit abgelenkt aufprallen und unter Ausnutzung des verblei¬ benden Restes an kinetischer Energie zerkleinert werden.At the mouth end 10 of the steam diffuser, a further diffuser mouth 16 of a further steam diffuser 17 is indicated schematically, to which another device, essentially the same as the device 6, is connected. The axes 18 and 19 of the particle streams leaving the diffusers 11 and 17 intersect one another in a granulate comminution section, indicated schematically by 20, whereby an intensive conversion of kinetic energy as grinding energy takes place, whereby the particles are further comminuted. The baffle plate designated by 21 also serves the same purpose, onto which the particle streams, possibly deflected by particles from the second unit in each case, impact and are comminuted using the remaining kinetic energy.
Das mit 22 bezeichnete Mahlgut kann nach erfolgter Siebung unmittelbar als Zement oder Zementzuschlagstoff eingesetzt werden, wobei ggf. noch vorhandenes Überkorn über die Leitung 13 in die Injektorkammer 12 rückgeführt werden kann. After grinding, the ground material designated 22 can be used directly as cement or cement aggregate, oversize which may still be present can be returned to the injector chamber 12 via the line 13.

Claims

Patentansprüche: Claims:
1. Verfahren zum Granulieren und Zerkleinern von schmelz¬ flüssigem Material und Mahlgut (22), wobei die Schmelze in1. Process for granulating and comminuting melt-liquid material and regrind (22), the melt in
5 eine Mischkammer (5) eingebracht wird, in die Mischkammer (5) Wasser, Wasserdampf und/oder Luft-/Wassergemische eingedüst werden und das verdampfte Wasser gemeinsam mit der erstarrten Schlacke über einen Diffusor (11) ausgestoßen wird, dadurch gekennzeichnet, daß die Schmelze unter Druck in die Misch-5 a mixing chamber (5) is introduced, water, steam and / or air / water mixtures are injected into the mixing chamber (5) and the evaporated water is expelled together with the solidified slag via a diffuser (11), characterized in that the Melt under pressure into the mixing
10 kammer eingebracht wird und der Austrittsstrahl des Diffusors (11) gegen eine Prallplatte (21) oder einen Austrittsstrahl eines weiteren Diffusors (17) gerichtet wird.10 chamber is introduced and the exit jet of the diffuser (11) is directed against a baffle plate (21) or an exit jet of a further diffuser (17).
2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß zwi- 15 sehen Mischkammer (5) und Diffusor über einen Injektor wei¬ teres Mahlgut (22) oder Additive eingebracht werden.2. The method according to claim 1, characterized in that between 15 see mixing chamber (5) and diffuser via an injector further regrind (22) or additives are introduced.
3. Verfahren nach Anspruch 1, oder 2, dadurch gekennzeichnet, daß der gebildete Dampf abgezogen und über einen Wärmetauscher3. The method according to claim 1, or 2, characterized in that the steam formed is drawn off and via a heat exchanger
20 geführt wird, und daß das Kondensat der Mischkammer (5) rück¬ geführt wird.20 is guided, and that the condensate of the mixing chamber (5) is recirculated.
4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekenn¬ zeichnet, daß die Austrittsgeschwindigkeit des DampfStrahlers4. The method according to any one of claims 1 to 3, characterized gekenn¬ characterized in that the exit speed of the steam radiator
25 aus dem Diffusor (11) kleiner als die Schallgeschwindigkeit eingestellt wird.25 from the diffuser (11) is set smaller than the speed of sound.
5. Einrichtung zum Granulieren und Zerkleinern von Hoch¬ ofenschlacke, Klinker od.dgl., bei welcher schmelzflüssige go Schlacke mit Wasser unter Ausbildung einer Glasphase abgekühlt wird, dadurch gekennzeichnet, daß eine Leitung (13) für schmelzflüssige Schlacke mit einer Mischkammer (6) verbunden ist, daß in die Mischkammer (6) Leitungen für Wasser (8) , Wasserdampf und/oder Wasser-/Luftgemische münden, daß an die5. Device for granulating and comminuting blast furnace slag, clinker or the like, in which molten go slag is cooled with water to form a glass phase, characterized in that a line (13) for molten slag with a mixing chamber (6) is connected to the fact that in the mixing chamber (6) lines for water (8), water vapor and / or water / air mixtures open to the
-.- Mischkammer (6) ein Diffusor (11) angeschlossen ist, und daß an die Austrittsöffnung (10) Prallfächen (21) oder weitere Austrittsöffnungen (16) für beschleunigte Teilchen, deren Ach- se die Achse (18) der Austrittsöffnung (10) des Diffusors (11) schneiden, angeordnet sind.-.- Mixing chamber (6), a diffuser (11) is connected, and that at the outlet opening (10) baffles (21) or further outlet openings (16) for accelerated particles, the Ach- se the axis (18) of the outlet opening (10) of the diffuser (11) intersect, are arranged.
6. Einrichtung nach Anspruch 5, dadurch gekennzeichnet, daß die Leitung (3) für schmelzflüssige Schlacke (2) über einen mit Preßluft beaufschlagbaren Düsenstock mit Ringdüsen (4) in die Mischkammer mündet.6. Device according to claim 5, characterized in that the line (3) for molten slag (2) via a pressurized air nozzle with ring nozzles (4) opens into the mixing chamber.
7. Einrichtung nach einem der Ansprüche 5 oder 6, dadurch gekennzeichnet, daß zwischen Mischkammer (5) und Diffusor (11) eine Injektorkammer (12) mit gegenüber der Austrittsöffnung (10) des Diffusors (11) geringerem wirksamen Querschnitt ange¬ ordnet ist, an welche eine Leitung (13) für weiteres Mahlgut oder Additive angeschlossen ist.7. Device according to one of claims 5 or 6, characterized in that between the mixing chamber (5) and the diffuser (11) an injector chamber (12) with respect to the outlet opening (10) of the diffuser (11) smaller effective cross-section is arranged, to which a line (13) for further regrind or additives is connected.
8. Einrichtung nach einem der Ansprüche 5, 6 oder 7, dadurch gekennzeichnet, daß nach der Austrittsöffnung (10) des Dif¬ fusors (11) eine Dampfabsaugeinrichtung angeordnet ist, die Dampfabsaugleitung mit wenigstens einem Wärmetauscher ver- bunden ist, worauf das Kondensat über eine Pumpe der Misch¬ kammer (5) rückführbar ist.8. Device according to one of claims 5, 6 or 7, characterized in that a steam suction device is arranged after the outlet opening (10) of the diffuser (11), the steam suction line is connected to at least one heat exchanger, whereupon the condensate a pump of the mixing chamber (5) can be returned.
9. Einrichtung nach einem der Ansprüche 5 bis 8, dadurch gekennzeichnet, daß dem Diffusor (11) eine Sieb- oder Sicht- einrichtung nachgeschaltet ist und daß der Siebüberlauf bzw. das Überkorn über eine Fördereinrichtung in die Injektions¬ kammer (12) rückführbar ist. 9. Device according to one of claims 5 to 8, characterized in that the diffuser (11) is followed by a sieve or viewing device and that the screen overflow or oversize is returnable via a conveyor into the injection chamber (12) .
EP95901265A 1993-12-03 1994-12-01 Process and device for granulating and crushing molten materials and grinding stocks Expired - Lifetime EP0683824B1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
AT2458/93 1993-12-03
AT0245893A AT400140B (en) 1993-12-03 1993-12-03 METHOD FOR GRANULATING AND CRUSHING MELT LIQUID MATERIAL AND GROUND, AND DEVICE FOR CARRYING OUT THIS METHOD
AT245893 1993-12-03
PCT/AT1994/000185 WO1995015402A1 (en) 1993-12-03 1994-12-01 Process and device for granulating and crushing molten materials and grinding stocks

Publications (2)

Publication Number Publication Date
EP0683824A1 true EP0683824A1 (en) 1995-11-29
EP0683824B1 EP0683824B1 (en) 1999-12-29

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EP95901265A Expired - Lifetime EP0683824B1 (en) 1993-12-03 1994-12-01 Process and device for granulating and crushing molten materials and grinding stocks

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US (1) US5667147A (en)
EP (1) EP0683824B1 (en)
AT (2) AT400140B (en)
AU (1) AU1057695A (en)
DE (1) DE59409039D1 (en)
DK (1) DK0683824T3 (en)
ES (1) ES2142468T3 (en)
GR (1) GR3032934T3 (en)
PT (1) PT683824E (en)
TR (1) TR27905A (en)
WO (1) WO1995015402A1 (en)
ZA (1) ZA949263B (en)

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DE19632698A1 (en) * 1996-08-14 1998-02-19 Forschungsgemeinschaft Eisenhu Fine grained slag sand production
AT405511B (en) * 1997-10-29 1999-09-27 Holderbank Financ Glarus METHOD FOR GRANULATING AND CRUSHING MELT LIQUID MATERIAL, AND DEVICE FOR CARRYING OUT THIS METHOD
US6319434B1 (en) 1998-02-18 2001-11-20 “Holderbank” Financière Glarus AG Method for granulating and grinding liquid slag and device for realizing the same
AT406262B (en) 1998-06-29 2000-03-27 Holderbank Financ Glarus METHOD AND DEVICE FOR GRANULATING AND CRUSHING LIQUID SLAG
US5976243A (en) * 1998-09-24 1999-11-02 Lafarge Canada Inc. Process for producing cement clinker containing blast furnace slag
AT406263B (en) * 1998-11-25 2000-03-27 Holderbank Financ Glarus Process for the comminution and granulation of slags
AT407247B (en) * 1998-12-01 2001-01-25 Holderbank Financ Glarus METHOD FOR GRANULATING LIQUID SLAG MOLDS AND DEVICE FOR CARRYING OUT THIS METHOD
AT406956B (en) * 1999-01-20 2000-11-27 Holderbank Financ Glarus METHOD FOR CRUSHING CLINKER AND DEVICE FOR CARRYING OUT THIS METHOD
AT406955B (en) * 1999-01-28 2000-11-27 Holderbank Financ Glarus Process and apparatus for the granulation and comminution of liquid slags
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BR9905656A (en) 1999-11-30 2001-07-24 Viviane Vasconcelos Vilela Ltd Apparatus and process for the extraction of heat and for the solidification of particles of molten materials
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Publication number Publication date
GR3032934T3 (en) 2000-07-31
AT400140B (en) 1995-10-25
ES2142468T3 (en) 2000-04-16
DK0683824T3 (en) 2000-06-19
ATE188258T1 (en) 2000-01-15
AU1057695A (en) 1995-06-19
TR27905A (en) 1995-10-11
PT683824E (en) 2000-06-30
ZA949263B (en) 1995-10-23
US5667147A (en) 1997-09-16
ATA245893A (en) 1995-02-15
WO1995015402A1 (en) 1995-06-08
EP0683824B1 (en) 1999-12-29
DE59409039D1 (en) 2000-02-03

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