EP0674945B1 - Method for feeding milling additives - Google Patents

Method for feeding milling additives Download PDF

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Publication number
EP0674945B1
EP0674945B1 EP95102478A EP95102478A EP0674945B1 EP 0674945 B1 EP0674945 B1 EP 0674945B1 EP 95102478 A EP95102478 A EP 95102478A EP 95102478 A EP95102478 A EP 95102478A EP 0674945 B1 EP0674945 B1 EP 0674945B1
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Prior art keywords
grinding
grinding chamber
chamber
aid
ground
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EP95102478A
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German (de)
French (fr)
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EP0674945A1 (en
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Hans-Dietmar Dr.Rer.Nat. Maury
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
    • B02C17/18—Details
    • B02C17/183—Feeding or discharging devices
    • B02C17/186—Adding fluid, other than for crushing by fluid energy

Definitions

  • the invention relates to a method for adding grinding aids mineral regrind, especially cement, in a through a partition tube grinding chamber divided into a coarse grinding chamber and a fine grinding chamber is ground, the grinding aid being sprayed directly onto the ground material.
  • the regrind so-called grinding aids usually liquid organic Chemicals, added. These chemicals prevent welding or The particles agglomerate with each other.
  • a generic method in which the grinding aid is sprayed directly onto the ground material is from the document Database WPI, Section CH, Week 7940, Derwent Publications Ltd., London, GB; Class L02, AN 79-73181b and SU-A-640 983 (CEMENT IND RES INST), January 8, 1979 ".
  • the present invention has for its object to provide a method for imparting of grinding aids to mineral material to be ground further develop such a way that it is possible to achieve a more efficient use of the grinding aid.
  • the invention is based on the finding that only one by targeted wetting certain area of the ground material, especially in the vicinity of the tube grinding chamber dividing partition, sufficient effect of the grinding aid is given, which effectively prevents agglomeration of the ground material.
  • Due to the Add the grinding aid as a bundled liquid jet of a water-grinding aid mixture is a good distribution of the grinding aid in the regrind and on the other hand a concentrated and thus a discharge of the Grinding aids to avoid wetting as a result of rinsing air in the tube grinding chamber of the ground material ensured.
  • the latter also contributes to the fact that Liquid jet emitted in close proximity to the predetermined area can be by the nozzle can be variably arranged in the axial direction. To one hand dampen the impact of the liquid jet on the regrind and on the other hand wet different areas of the regrind by varying the spray pressure to be able to, the liquid jet in the substantially axial direction of the Pipe grinding chamber delivered.
  • the combinative effect of the features of the method according to the invention guarantees a process that is known in the prior art more efficient use of grinding aids, which is an increase in Mill throughput with the same quality of the grinding product or allows a higher fineness with the same mill throughput.
  • the water grinding aid mixture is preferably at a pressure greater than 5 sprayed bar on the regrind. Pressures greater than 5 bar make it possible Grinding aids in a targeted jet to almost all areas of the grinding chamber aim so that with regard to the targeted application of the regrind in the Grinding chamber there are no restrictions. For economic reasons suggested that the water grinding aid mixture be at a pressure less than 40 bar and greater than 5 bar is sprayed onto the regrind. A restriction on Pressures less than 40 bar make it possible to use a method according to the invention to carry out reasonable economic effort. The process can be Carry out even at pressures higher than 40 bar, however pumps are used for this needed, the purchase of which is associated with a high economic outlay.
  • the grinding aid is preferably introduced into the tube grinding chamber via a controllable pump promoted so that the desired amount of grinding aid exactly can be determined. Concentrated grinding aids can thereby be added exact dosage can be sprayed onto the regrind.
  • the introduction of the grinding aid into the tube grinding chamber by at least one the end walls of the tube grinding chamber enables a particularly simple axial Aligning the bundled grinding aid jet with a predetermined one Area of the material to be ground within the grinding chamber.
  • a lance with a subsequent nozzle through which the grinding aid is bundled onto the Regrind is sprayed on be displaceable in the axial direction of the tube grinding chamber, so that the nozzle located at the end of the lance is in close proximity to the predetermined area onto which the grinding aid is to be sprayed, can be arranged.
  • the grinding aid can be either by one of the End walls of the tube grinding chamber as well as on both sides in the tube grinding chamber be introduced so that the grinding aid on both sides to a predetermined Area of the millbase or two different areas of the millbase can be done without changing the position of the nozzles spraying the regrind.
  • the grinding aid can through the jacket of the tube grinding chamber in the Tube grinding chamber are introduced so that the inlet and / or outlet of the ground material not through the grinding aid through the end walls of the tube grinding chamber Lines is affected.
  • the inventive method can be in Carry out already installed tube mills as tube mills with little effort can be retrofitted such that the grinding aid can be introduced by the Pipe jacket becomes possible.
  • the delivery rate of Increase the pump and it is possible to build up a sufficiently high pressure so that the grinding aid dissolved in the diluent in a concentrated liquid jet be aimed directly at the desired area within the grinding chamber can.
  • the grinding aid can also be used over long distances be promoted within the grinding chamber.
  • the Liquid jet are bundled in such a way that targeted, targeted areas the grinding stock can be sprayed with grinding aids.
  • the conveying of the water-grinding aid mixture is preferably automatic regulated, the regulation with the control of the tube grinding chamber and the Dosage of the ground material is coupled, so that there is a closed control loop results in exactly the amount of grinding aid introduced into the grinding chamber can be matched to the other parameters of the grinding process.
  • the drawing shows a tube grinding chamber 1 through an intermediate wall 2 in a Coarse grinding chamber 1a and a fine grinding chamber 1b is divided.
  • On the face the coarse grinding chamber 1a is on the one hand the partition 2 and on the other hand an inlet end wall 3a, which is firmly connected to the tube grinding chamber 1 is arranged.
  • To fill the tube grinding chamber 1 with regrind 4 is in the connection a slide is formed on the inlet end wall 3a.
  • the fine grinding chamber 1b is on the one hand through the intermediate wall 2 and on the other hand through an outlet end wall 3b, through which the finished ground product from the tube grinding chamber 1 exits, limited.
  • the exemplary embodiment shows two of a lance 5a, 5b and a nozzle 6a, 6b formed pipe systems for the application of grinding aids by each Face of the tube grinding chamber.
  • the two lances 5a, 5b are parallel to the Longitudinal axis of the tube grinding chamber 1 aligned so that the lances are perpendicular passed through the inlet end wall 3a or the outlet end wall 3b are.
  • a line system 5c on the outside of the jacket Pipe grinding chamber can be arranged through which the grinding aid through the jacket of the tube grinding chamber at any point in the tube grinding chamber can be.
  • the ends of the lances 5a, 5b or outside the tube grinding chamber 1 of the pipeline system 5c are connected to a pump 8 via pipelines 7a, 7b connected, which is operated by means of a motor 9 and via another, with a reservoir 10 connected pipeline 11 is fed.
  • a pump 8 via pipelines 7a, 7b connected, which is operated by means of a motor 9 and via another, with a reservoir 10 connected pipeline 11 is fed.
  • the water supplied via a filling line 12 is dissolved Grinding aids stocked.
  • An agitator 13 prevents segregation between the water and the grinding aid.
  • the ground material added through the inlet end wall of the tube grinding chamber is in the rotating tube grinding chamber is conveyed from the inlet side to the outlet side and ground it.
  • the pump 8 is pumped and compressed water grinding aid mixture through the piping 7a, 7b conveyed into the lances 5a, 5b and targeted by the nozzles 6a, 6b Grist 4 sprayed on.
  • the mixture becomes one in the nozzles 6a, 6b and 6c Liquid jet 14a, 14b or 14c bundled and on the regrind 4 in the area the partition 2 aligned.
  • the ground material 4 wetted with the grinding aid passes through the fine grinding chamber 1b, in which the grinding aid prevents the particles from welding together.
  • a selective alignment of the liquid jet 14a, 14b or 14c can be carried out via the nozzles 6a, 6b and 6c, respectively Nozzle with a suitable geometry is used to align the liquid jet becomes.
  • the pump 8 Since the pump 8 is regulated and via a control loop with the other parameters the process, such as the control of the tube grinding chamber and the dosage of the ground material is coupled, the amount of added Grinding aids should be adjusted as best as possible to the respective operating point.

Abstract

The system is for grinding minerals, particularly cement (4), in a tubular chamber (1). It can be sprayed at a pressure greater than 5 bar and less than 40 bar. The chamber can be divided by a partition (2) into coarse- and fine-grinding sections (1a, 1b), the material being sprayed immediately adjacent to the partition. A variable-delivery pump (8) can be used to deliver the material (4) into the chamber, while the water-soluble grinding aid can be delivered via the chamber casing or end walls, its supply being regulated to match delivery of material into the chamber.

Description

Die Erfindung betrifft ein Verfahren zum Begeben von Mahlhilfsmitteln zu mineralischem Mahlgut, insbesondere Zement, das in einer durch eine Zwischenwand in eine Grobmahlkammer und eine Feinmahlkammer unterteilten Rohrmahlkammer gemahlen wird, wobei das Mahlhilfsmittel direkt auf das Mahlgut aufgespritzt wird.The invention relates to a method for adding grinding aids mineral regrind, especially cement, in a through a partition tube grinding chamber divided into a coarse grinding chamber and a fine grinding chamber is ground, the grinding aid being sprayed directly onto the ground material.

Zur Erhöhung des Mühlendurchsatzes bei konstanter Güte des Mahlproduktes werden dem Mahlgut sogenannte Mahlhilfsmittel, in der Regel flüssige organische Chemikalien, zugegeben. Diese Chemikalien verhindern ein Verschweißen bzw. Agglomerieren der Partikel miteinander.To increase the mill throughput while maintaining the quality of the grinding product the regrind so-called grinding aids, usually liquid organic Chemicals, added. These chemicals prevent welding or The particles agglomerate with each other.

Aus dem Fachaufsatz ''Über die Verwendung von Mahlhilfen bei der Zementmahlung'', Zement-Kalk-Gips, 22 (1969) Nr. 5, Seiten 193 ff, ist bereits ein Verfahren bekannt, bei dem das Mahlhilfsmittel in die Mahlkammer eingedüst wird und sich flächig auf das Mahlgut niederschlägt. Durch die Drehung des Rohres wird darüber hinaus ein Teil des Mahlgutes in der Mahlkammer verwirbelt, so daß sich dampf- oder tropfenförmiges Mahlhilfsmittel auf der Oberfläche dieser Mahlgutpartikel anlagert. Zur Verbesserung der Verteilung in der Mahlkammer und zur Erleichterung der Dosierung geringer Mengen von Mahlhilfsmittel kann das Mahlhilfsmittel in Wasser gelöst sein. Ein gattungsgemäßes Verfahren, bei dem das Mahlhilfsmittel direkt auf das Mahlgut aufgespritzt wird, ist aus dem Dokument

Figure 00010001
Database WPI, Section CH, Week 7940, Derwent Publications Ltd., London, GB; Class L02, AN 79-73181b und SU-A-640 983 (CEMENT IND RES INST), 8. Januar 1979" bekannt.From the technical paper "About the use of grinding aids in cement grinding", cement-lime gypsum, 22 (1969) No. 5, pages 193 ff, a method is already known in which the grinding aid is injected into the grinding chamber and is reflected flatly on the regrind. As a result of the rotation of the tube, part of the material to be ground is also swirled in the grinding chamber, so that steaming or drop-shaped grinding aids are deposited on the surface of these material to be ground. The grinding aid can be dissolved in water to improve the distribution in the grinding chamber and to facilitate the metering of small amounts of grinding aid. A generic method in which the grinding aid is sprayed directly onto the ground material is from the document
Figure 00010001
Database WPI, Section CH, Week 7940, Derwent Publications Ltd., London, GB; Class L02, AN 79-73181b and SU-A-640 983 (CEMENT IND RES INST), January 8, 1979 ".

Bei den aus dem Stand der Technik bekannten Verfahren tritt der Nachteil auf, daß ein Teil des Mahlhilfsmittels, bzw. des in Wasser gelösten Mahlhilfsmittels, von der die Mahlkammer durchströmenden Spülluft aus der Mahlkammer ausgetragen wird, ohne vorher in Kontakt mit dem Mahlgut gekommen zu sein, so daß dieser Anteil des Mahlhilfsmittels ohne Wirkung auf den Mahlvorgang bleibt und sich ein nicht effizienter Einsatz des Mahlhilfsmittels ergibt.The disadvantage of the methods known from the prior art is that a Part of the grinding aid, or of the grinding aid dissolved in water, of which the Flushing purge air is discharged from the grinding chamber without to have previously come into contact with the regrind, so that this portion of the Grinding aid has no effect on the grinding process and is not efficient Use of the grinding aid results.

Davon ausgehend liegt der vorliegenden Erfindung die Aufgabe zugrunde, ein Verfahren zum Beigeben von Mahlhilfsmitteln zu mineralischem Mahlgut dahingehend weiterzubilden, daß sich ein effizienterer Einsatz des Mahlhilfsmittels erzielen läßt.Assuming the present invention has for its object to provide a method for imparting of grinding aids to mineral material to be ground further develop such a way that it is possible to achieve a more efficient use of the grinding aid.

Diese Aufgabe ist bei einem Verfahren mit den voranstehend genannten Merkmalen erfindungsgemäß dadurch gelöst, daß das Mahlhilfsmittel als gebündelter Flüssigkeitsstrahl eines Wasser-Mahlhilfsmittel-Gemisches zur gezielten Benetzung eines vorbestimmten Bereiches des in der Rohrmahlkammer befindlichen Mahlgutes in im wesentlichen axialer Richtung der Rohrmahlkammer aus einer Düse abgegeben wird, die in der axialen Richtung variabel anordbar ist.This object is achieved with a method having the above mentioned features according to the invention in that the grinding aid grinding aid water mixture discharged as bundled liquid jet of the targeted wetting a predetermined region of the grinding stock located in the Rohrmahlkammer in a substantially axial direction of the Rohrmahlkammer from a nozzle which can be arranged variably in the axial direction.

Der Erfindung liegt die Erkenntnis zugrunde, daß durch gezielte Benetzung allein eines bestimmten Bereiches des Mahlgutes, vor allem in der Nähe der die Rohrmahlkammer unterteilenden Zwischenwand, bereits eine ausreichende Wirkung des Mahlhilfsmittels gegeben ist, die wirksam die Agglomeration des Mahlgutes verhindert. Aufgrund der Beigabe des Mahlhilfsmittels als gebündelter Flüssigkeitsstrahl eines Wasser-Mahlhilfsmittel-Gemisches ist zum einen eine gute Verteilung des Mahlhilfsmittels in dem Mahlgut und zum anderen eine konzentrierte und damit ein Austragen des Mahlhilfsmittels in Folge von Spülluft in der Rohrmahlkammer vermeidende Benetzung des Mahlguts sichergestellt. Hinsichtlich letzterem trägt außerdem bei, daß der Flüssigkeitsstrahl in unmittelbarer Nähe zu dem vorbestimmten Bereich abgegeben werden kann, indem die Düse in axialer Richtung variabel anordbar ist. Um einerseits den Aufprall des Flüssigkeitsstrahls auf dem Mahlgut zu dämpfen und andererseits durch Variation des Spritzdruckes unterschiedliche Bereiche des Mahlgutes benetzen zu können, wird der Flüssigkeitsstrahl in im wesentlichen axialer Richtung der Rohrmahlkammer abgegeben.The invention is based on the finding that only one by targeted wetting certain area of the ground material, especially in the vicinity of the tube grinding chamber dividing partition, sufficient effect of the grinding aid is given, which effectively prevents agglomeration of the ground material. Due to the Add the grinding aid as a bundled liquid jet of a water-grinding aid mixture is a good distribution of the grinding aid in the regrind and on the other hand a concentrated and thus a discharge of the Grinding aids to avoid wetting as a result of rinsing air in the tube grinding chamber of the ground material ensured. With regard to the latter also contributes to the fact that Liquid jet emitted in close proximity to the predetermined area can be by the nozzle can be variably arranged in the axial direction. To one hand dampen the impact of the liquid jet on the regrind and on the other hand wet different areas of the regrind by varying the spray pressure to be able to, the liquid jet in the substantially axial direction of the Pipe grinding chamber delivered.

Die kombinative Wirkung der Merkmale des erfindungsgemäßen Verfahrens gewährleistet einen gegenüber den im Stand der Technik bekannten Verfahren effizienteren Einsatz von Mahlhilfsmitteln, der mithin eine Erhöhung des Mühlendurchsatzes bei gleichbleibender Güte des Mahlproduktes beziehungsweise eine höhere Mahlfeinheit bei gleichbleibendem Mühlendurchsatz ermöglicht.The combinative effect of the features of the method according to the invention guarantees a process that is known in the prior art more efficient use of grinding aids, which is an increase in Mill throughput with the same quality of the grinding product or allows a higher fineness with the same mill throughput.

Vorzugsweise wird das Wasser-Mahlhilfsmittel-Gemisch mit einem Druck größer als 5 bar auf das Mahlgut aufgespritzt. Drücke größer als 5 bar ermöglichen es, das Mahlhilfsmittel in einem gezielten Strahl auf nahezu alle Bereiche der Mahlkammer zu richten, so daß hinsichtlich der gezielten Anwendung des Mahlgutes in der Mahlkammer keine Beschränkungen bestehen. Aus wirtschaftlichen Gründen wird vorgeschlagen, daß das Wasser-Mahlhilfsmittel-Gemisch mit einem Druck kleiner als 40 bar und größer als 5 bar auf das Mahlgut aufgespritzt wird. Eine Beschränkung auf Drücke kleiner als 40 bar ermöglicht es, das erfindungsgemäße Verfahren mit einem vertretbaren wirtschaftlichen Aufwand durchzuführen. Das Verfahren läßt sich zwar auch bei höheren Drücken als 40 bar durchführen, jedoch werden dafür Pumpen benötigt, deren Anschaffung mit einem hohen wirtschaftlichen Aufwand verbunden ist.The water grinding aid mixture is preferably at a pressure greater than 5 sprayed bar on the regrind. Pressures greater than 5 bar make it possible Grinding aids in a targeted jet to almost all areas of the grinding chamber aim so that with regard to the targeted application of the regrind in the Grinding chamber there are no restrictions. For economic reasons suggested that the water grinding aid mixture be at a pressure less than 40 bar and greater than 5 bar is sprayed onto the regrind. A restriction on Pressures less than 40 bar make it possible to use a method according to the invention to carry out reasonable economic effort. The process can be Carry out even at pressures higher than 40 bar, however pumps are used for this needed, the purchase of which is associated with a high economic outlay.

Praktische Versuche haben gezeigt, daß die höchste Steigerung des Mühlendurchsatzes erzielt werden kann, wenn das Mahlhilfsmittel in eine durch eine Zwischenwand in eine Grobmahlkammer und in eine Feinmahlkammer unterteilte Rohrmahlkammer unmittelbar im Bereich der Zwischenwand auf das Mahlgut aufgespritzt wird.Practical tests have shown that the highest increase in mill throughput can be achieved if the grinding aid in a through a partition pipe grinding chamber divided into a coarse grinding chamber and a fine grinding chamber is sprayed onto the ground material directly in the area of the intermediate wall.

Vorzugsweise wird das Mahlhilfsmittel über eine regelbare Pumpe in die Rohrmahlkammer gefördert, so daß die gewünschte Menge des Mahlhilfsmittels genau bestimmt werden kann. Dadurch kann insbesondere konzentriertes Mahlhilfsmittel bei exakter Dosierung auf das Mahlgut aufgespritzt werden. The grinding aid is preferably introduced into the tube grinding chamber via a controllable pump promoted so that the desired amount of grinding aid exactly can be determined. Concentrated grinding aids can thereby be added exact dosage can be sprayed onto the regrind.

Das Einbringen des Mahlhilfsmittels in die Rohrmahlkammer durch mindestens eine der Stirnwände der Rohrmahlkammer ermöglicht ein besonders einfaches axiales Ausrichten des gebündelten Mahlhilfsmittel-Strahles auf einen vorher bestimmten Bereich des Mahlgutes innerhalb der Mahlkammer. Beispielsweise kann eine Lanze mit einer sich anschließenden Düse, durch die das Mahlhilfsmittel gebündelt auf das Mahlgut aufgespritzt wird, in axialer Richtung der Rohrmahlkammer verschiebbar sein, so daß die an dem Lanzenende angeordnete Düse in unmittelbarer Nähe zu dem vorher-bestimmten Bereich, auf den das Mahlhilfsmittel aufgespritzt werden soll, angeordnet werden kann. Das Mahlhilfsmittel kann derart sowohl durch eine der Stirnwände der Rohrmahlkammer als auch beidseitig in die Rohrmahlkammer eingebracht werden, so daß das Mahlhilfsmittel beidseitig auf einen vorbestimmten Bereich des Mahlgutes oder aber auf zwei unterschiedliche Bereiche des Mahlgutes ohne Verändern der Lage der das Mahlgut aufspritzenden Düsen erfolgen kann.The introduction of the grinding aid into the tube grinding chamber by at least one the end walls of the tube grinding chamber enables a particularly simple axial Aligning the bundled grinding aid jet with a predetermined one Area of the material to be ground within the grinding chamber. For example, a lance with a subsequent nozzle through which the grinding aid is bundled onto the Regrind is sprayed on, be displaceable in the axial direction of the tube grinding chamber, so that the nozzle located at the end of the lance is in close proximity to the predetermined area onto which the grinding aid is to be sprayed, can be arranged. The grinding aid can be either by one of the End walls of the tube grinding chamber as well as on both sides in the tube grinding chamber be introduced so that the grinding aid on both sides to a predetermined Area of the millbase or two different areas of the millbase can be done without changing the position of the nozzles spraying the regrind.

Alternativ kann das Mahlhilfsmittel durch den Mantel der Rohrmahlkammer in die Rohrmahlkammer eingebracht werden, so daß der Zu- und/oder Ablauf des Mahlgutes durch die Stirnwände der Rohrmahlkammer nicht durch das Mahlhilfsmittel führende Leitungen beeinträchtigt wird. Außerdem läßt sich das erfindungsgemäße Verfahren in bereits installierten Rohrmühlen durchführen, da Rohrmühlen mit geringem Aufwand derart nachgerüstet werden können, daß ein Einbringen des Mahlhilfsmittels durch den Rohrmantel möglich wird.Alternatively, the grinding aid can through the jacket of the tube grinding chamber in the Tube grinding chamber are introduced so that the inlet and / or outlet of the ground material not through the grinding aid through the end walls of the tube grinding chamber Lines is affected. In addition, the inventive method can be in Carry out already installed tube mills as tube mills with little effort can be retrofitted such that the grinding aid can be introduced by the Pipe jacket becomes possible.

Da in vorteilhafter Weise das in Verdünnungsmittel, vorzugsweise in Wasser, gelöste Mahlhilfsmittel auf das Mahlgut aufgespritzt wird, läßt sich die Fördermenge der Pumpe erhöhen, und es ist möglich, einen genügend hohen Druck aufzubauen, so daß das in Verdünnungsmittel gelöste Mahlhilfsmittel in einem gebündelten Flüssigkeitsstrahl direkt auf den gewünschten Bereich innerhalb der Mahlkammer gerichtet werden kann. In einem Flüssigkeitsstrahl kann das Mahlhilfsmittel auch über größere Entfernungen innerhalb der Mahlkammer gefördert werden. Darüber hinaus kann der Flüssigkeitsstrahl derart gebündelt werden, daß gezielt gewünschte punktuelle Bereiche des Mahlgutes mit Mahlhilfsmittel bespritzt werden können. Since this is advantageously dissolved in the diluent, preferably in water Grinding aid is sprayed onto the regrind, the delivery rate of Increase the pump, and it is possible to build up a sufficiently high pressure so that the grinding aid dissolved in the diluent in a concentrated liquid jet be aimed directly at the desired area within the grinding chamber can. In a liquid jet, the grinding aid can also be used over long distances be promoted within the grinding chamber. In addition, the Liquid jet are bundled in such a way that targeted, targeted areas the grinding stock can be sprayed with grinding aids.

Vorzugsweise wird das Fördern des Wasser-Mahlhilfsmittel-Gemisches automatisch geregelt, wobei die Regelung mit der Steuerung der Rohrmahlkammer und der Dosierung des Mahlgutes gekoppelt ist, so daß sich ein geschlossener Regelkreis ergibt, in dem die in die Mahlkammer eingebrachte Menge des Mahlhilfsmittels genau auf die übrigen Parameter des Mahlprozesses abgestimmt werden kann.The conveying of the water-grinding aid mixture is preferably automatic regulated, the regulation with the control of the tube grinding chamber and the Dosage of the ground material is coupled, so that there is a closed control loop results in exactly the amount of grinding aid introduced into the grinding chamber can be matched to the other parameters of the grinding process.

Weitere Einzelheiten und Vorteile des Gegenstandes der Erfindung ergeben sich aus der nachfolgenden Beschreibung der Zeichnung, in der eine bevorzugte Ausführungsform einer Vorrichtung zur Durchführung des erfindungsgemäßen Verfahrens schematisch dargestellt ist.Further details and advantages of the subject matter of the invention result from the following description of the drawing, in which a preferred embodiment a device for performing the method according to the invention is shown schematically.

Die Zeichnung zeigt eine Rohrmahlkammer 1, die durch eine Zwischenwand 2 in eine Grobmahlkammer 1a und eine Feinmahlkammer 1b unterteilt ist. An den Stirnseiten der Grobmahlkammer 1a ist einerseits die Zwischenwand 2 und andererseits eine Einlaufstirnwand 3a, die mit der Rohrmahlkammer 1 fest verbunden ist, angeordnet. Zum Befüllen der Rohrmahlkammer 1 mit Mahlgut 4 ist im Anschluß an die Einlaufstirnwand 3a eine Rutsche ausgebildet. Die Feinmahlkammer 1b ist einerseits durch die Zwischenwand 2 und andererseits durch eine Auslaufstirnwand 3b, durch die das fertig gemahlene Mahlprodukt aus der Rohrmahlkammer 1 austritt, begrenzt.The drawing shows a tube grinding chamber 1 through an intermediate wall 2 in a Coarse grinding chamber 1a and a fine grinding chamber 1b is divided. On the face the coarse grinding chamber 1a is on the one hand the partition 2 and on the other hand an inlet end wall 3a, which is firmly connected to the tube grinding chamber 1 is arranged. To fill the tube grinding chamber 1 with regrind 4 is in the connection a slide is formed on the inlet end wall 3a. The fine grinding chamber 1b is on the one hand through the intermediate wall 2 and on the other hand through an outlet end wall 3b, through which the finished ground product from the tube grinding chamber 1 exits, limited.

Das Ausführungsbeispiel zeigt zwei aus je einer Lanze 5a, 5b und einer Düse 6a, 6b gebildete Leitungssysteme zum Aufbringen von Mahlhilfsmittel durch jede Stirnseite der Rohrmahlkammer. Die beiden Lanzen 5a, 5b sind parallel zu der Längsachse der Rohrmahlkammer 1 ausgerichtet, so daß die Lanzen jeweils senkrecht durch die Einlaufstirnwand 3a bzw. die Auslaufstirnwand 3b hindurchgeführt sind. Alternativ kann, wie die strichpunktierten Linien des dargestellten Ausführungsbeispiels veranschaulichen, ein Leitungssystem 5c außen am Mantel der Rohrmahlkammer angeordnet sein, durch den das Mahlhilfsmittel durch den Mantel der Rohrmahlkammer an beliebiger Stelle in die Rohrmahlkammer eingebracht werden kann. Gezeigt ist der Verlauf eines Rohrleitungssystems 5c, welches im Bereich der Zwischenwand in radialer Richtung auf den Mittelpunkt der Rohrmahlkammer 1 ausgerichtet ist, so daß eine Düse 6c am Ende des Rohrleitungssystems 5c in der Mittenöffnung der Zwischenwand 2 angeordnet ist.The exemplary embodiment shows two of a lance 5a, 5b and a nozzle 6a, 6b formed pipe systems for the application of grinding aids by each Face of the tube grinding chamber. The two lances 5a, 5b are parallel to the Longitudinal axis of the tube grinding chamber 1 aligned so that the lances are perpendicular passed through the inlet end wall 3a or the outlet end wall 3b are. Alternatively, like the dash-dotted lines of the illustrated embodiment illustrate a line system 5c on the outside of the jacket Pipe grinding chamber can be arranged through which the grinding aid through the jacket of the tube grinding chamber at any point in the tube grinding chamber can be. The course of a pipeline system 5c is shown, which in the Area of the partition in the radial direction to the center of the tube grinding chamber 1 is aligned so that a nozzle 6c at the end of the piping system 5c is arranged in the center opening of the intermediate wall 2.

Die außerhalb der Rohrmahlkammer 1 liegenden Enden der Lanzen 5a, 5b bzw. des Rohrleitungssystems 5c sind über Rohrleitungen 7a, 7b mit einer Pumpe 8 verbunden, die mittels eines Motors 9 betrieben wird und über eine weitere, mit einem Vorratsbehälter 10 verbundene Rohrleitung 11 gespeist wird. In dem Vorratsbehälter 10 wird das über eine Einfülleitung 12 zugeführte in Wasser gelöstes Mahlhilfsmittel bevorratet. Ein Rührwerk 13 verhindert eine Entmischung zwischen dem Wasser und dem Mahlhilfsmittel.The ends of the lances 5a, 5b or outside the tube grinding chamber 1 of the pipeline system 5c are connected to a pump 8 via pipelines 7a, 7b connected, which is operated by means of a motor 9 and via another, with a reservoir 10 connected pipeline 11 is fed. In the reservoir 10, the water supplied via a filling line 12 is dissolved Grinding aids stocked. An agitator 13 prevents segregation between the water and the grinding aid.

Das durch die Einlaufstirnwand der Rohrmahlkammer zugegebene Mahlgut wird in der sich drehenden Rohrmahlkammer von der Einlaufseite zu der Auslaufseite gefördert und dabei gemahlen. Um ein Agglomerieren der Partikel miteinander im Bereich der Feinmahlkammer 1b zu verhindern, wird das über die Pumpe 8 geförderte und komprimierte Wasser-Mahlhilfsmittel-Gemisch durch die Rohrleitungen 7a, 7b in die Lanzen 5a, 5b gefördert und durch die Düsen 6a, 6b gezielt auf das Mahlgut 4 aufgespritzt. In den Düsen 6a, 6b bzw. 6c wird das Gemisch zu einem Flüssigkeitsstrahl 14a, 14b bzw. 14c gebündelt und auf das Mahlgut 4 im Bereich der Zwischenwand 2 ausgerichtet.The ground material added through the inlet end wall of the tube grinding chamber is in the rotating tube grinding chamber is conveyed from the inlet side to the outlet side and ground it. To agglomerate the particles with each other in the area to prevent the fine grinding chamber 1b, the pump 8 is pumped and compressed water grinding aid mixture through the piping 7a, 7b conveyed into the lances 5a, 5b and targeted by the nozzles 6a, 6b Grist 4 sprayed on. The mixture becomes one in the nozzles 6a, 6b and 6c Liquid jet 14a, 14b or 14c bundled and on the regrind 4 in the area the partition 2 aligned.

Das mit dem Mahlhilfsmittel benetzte Mahlgut 4 durchläuft die Feinmahlkammer 1b, in der das Mahlhilfsmittel ein Verschweißen der Partikel miteinander verhindert. Eine punktuelle Ausrichtung des Flüssigkeitsstrahles 14a, 14b bzw. 14c kann über die Düsen 6a, 6b bzw. 6c vorgenommen werden, wobei jeweils eine Düse mit geeigneter Geometrie zur Ausrichtung des Flüssigkeitsstrahles verwendet wird.The ground material 4 wetted with the grinding aid passes through the fine grinding chamber 1b, in which the grinding aid prevents the particles from welding together. A selective alignment of the liquid jet 14a, 14b or 14c can be carried out via the nozzles 6a, 6b and 6c, respectively Nozzle with a suitable geometry is used to align the liquid jet becomes.

Da die Pumpe 8 geregelt ist und über einen Regelkreis mit den sonstigen Parametern des Prozesses, wie beispielsweise der Steuerung der Rohrmahlkammer und der Dosierung des Mahlgutes gekoppelt ist, kann die Menge des zugegebenen Mahlhilfsmittels bestmöglich auf den jeweiligen Betriebspunkt abgestellt werden.Since the pump 8 is regulated and via a control loop with the other parameters the process, such as the control of the tube grinding chamber and the dosage of the ground material is coupled, the amount of added Grinding aids should be adjusted as best as possible to the respective operating point.

Insgesamt ist dadurch eine bestmögliche Ausnutzung des Mahlhilfsmittels möglich, so daß bei gleichbleibender Güte des Mahlproduktes ein erhöhter Mühlendurchsatz bzw. eine höhere Mahlfeinheit bei gleichbleibendem Durchsatz erzielt wird. Overall, this enables the best possible use of the grinding aid, so that an increased mill throughput while the quality of the grinding product remains the same or achieved a higher fineness with the same throughput becomes.

BezugszeichenlisteReference list

11
RohrmahlkammerPipe grinding chamber
1a1a
GrobmahlkammerCoarse grinding chamber
1b1b
FeinmahlkammerFine grinding chamber
22nd
ZwischenwandPartition
3a3a
EinlaufstirnwandInlet bulkhead
3b3b
AuslaufstirnwandDischarge end wall
44th
Mahlkörper und MahlgutGrinding media and grist
5a5a
Lanzelance
5b5b
Lanzelance
5c5c
LeitungssystemPipe system
6a6a
Düsejet
6b6b
Düsejet
6c6c
Düsejet
7a7a
RohrleitungPipeline
7b7b
RohrleitungPipeline
88th
Pumpepump
99
Motorengine
1010th
VorratsbehälterStorage container
1111
RohrleitungPipeline
1212th
EinfülleitungFilling line
1313
RührwerkAgitator
14a14a
FlüssigkeitsstrahlLiquid jet
14b14b
FlüssigkeitsstrahlLiquid jet
14c14c
FlüssigkeitsstrahlLiquid jet
1515
MühlenmantelMill jacket

Claims (6)

  1. A method of adding grinding aids to mineral material to be ground (4), especially cement, which is ground in a tubular grinding chamber (1) subdivided by an intermediate wall (2) into a coarse grinding chamber (1a) and a fine grinding chamber (1b), the grinding aid being sprayed directly onto the material to be ground (4), characterized in that the grinding aid is discharged, in the essentially axial direction of the tubular grinding chamber (1), from a nozzle (5a, 5b), which is arranged so that it can be varied in the axial direction, as a directed liquid jet (14a, 14b, 14c) of a water/grinding-aid mixture, for the purpose of specifically wetting a predetermined region of the material to be ground (4) which is in the tubular grinding chamber (1).
  2. Method according to Claim 1, characterized in that the water/grinding-aid mixture is sprayed onto the material to be ground (4) at a pressure greater than 5 bar.
  3. Method according to Claim 1 or 2, characterized in that the water/grinding-aid mixture is sprayed onto the material to be ground (4) at a pressure less than 40 bar and greater than 5 bar.
  4. Method according to one of Claims 1 to 3, characterized in that the water/grinding-aid mixture is delivered into the tubular grinding chamber (1) by a controllable pump (8).
  5. Method according to one of Claims 1 to 4, characterized in that the grinding aid is introduced through at least one of the end walls (3a, 3b) of the tubular grinding chamber (1).
  6. Method according to at least one of the preceding claims, characterized in that the delivery of the water/grinding-aid mixture is automatically regulated, and the regulation is coupled to the control of the tubular grinding chamber (1) and the metering of the material to be ground (4).
EP95102478A 1994-03-30 1995-02-22 Method for feeding milling additives Expired - Lifetime EP0674945B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4411105 1994-03-30
DE4411105A DE4411105C1 (en) 1994-03-30 1994-03-30 Method of feeding auxiliary grinding means

Publications (2)

Publication Number Publication Date
EP0674945A1 EP0674945A1 (en) 1995-10-04
EP0674945B1 true EP0674945B1 (en) 1999-12-08

Family

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Country Status (6)

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EP (1) EP0674945B1 (en)
AT (1) ATE187360T1 (en)
DE (2) DE4411105C1 (en)
DK (1) DK0674945T3 (en)
ES (1) ES2140570T3 (en)
GR (1) GR3032354T3 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005036945B4 (en) * 2005-08-05 2009-04-16 Netzsch-Feinmahltechnik Gmbh Automatic control of the additive addition in Feinstzerkleinerungsprozessen
CN106000553B (en) * 2016-07-19 2018-10-09 无锡新而立机械设备有限公司 Negative pressure discharging ball milling unit
CN105944798B (en) * 2016-07-19 2018-08-31 无锡新而立机械设备有限公司 Negative pressure ball mill
CN106582966B (en) * 2016-11-28 2018-11-27 中信重工机械股份有限公司 A kind of hardened material of grinding machine breaks up system
IT201900015626A1 (en) * 2019-09-05 2021-03-05 Certech S P A Con Socio Unico Continuous mill at controllable level

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB970897A (en) * 1962-06-26 1964-09-23 Smidth & Co As F L Improvements relating to grinding cement clinker and similar materials
FR1400554A (en) * 1964-04-16 1965-05-28 Kloeckner Humboldt Deutz Ag Process for very fine grinding of dry materials and device for carrying out this process
SU640983A1 (en) * 1976-08-11 1979-01-05 Всесоюзное Государственное Специальное Бюро По Проектированию Пуско-Наладочных И Проектно-Конструкторских Работ В Цементной Промышленности Method of obtaining plasticized or hydrophobic cement and device for obtaining same
SU607589A1 (en) * 1977-01-24 1978-05-25 Государственный Всесоюзный Научно-Исследовательский Институт Цементной Промышленности Method of grinding portland-cement bricks and additives
JPS6072995A (en) * 1983-09-30 1985-04-25 Babcock Hitachi Kk Production of highly concentrated coal/water slurry
SU1675255A1 (en) * 1989-04-18 1991-09-07 Белгородский технологический институт строительных материалов им.И.А.Гришманова Method of cement grinding

Also Published As

Publication number Publication date
DE4411105C1 (en) 1995-04-06
ES2140570T3 (en) 2000-03-01
DK0674945T3 (en) 2000-05-29
EP0674945A1 (en) 1995-10-04
ATE187360T1 (en) 1999-12-15
GR3032354T3 (en) 2000-04-27
DE59507357D1 (en) 2000-01-13

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