EP2407244B1 - Method for comminution of material by a tube mill - Google Patents

Method for comminution of material by a tube mill Download PDF

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Publication number
EP2407244B1
EP2407244B1 EP11166409.0A EP11166409A EP2407244B1 EP 2407244 B1 EP2407244 B1 EP 2407244B1 EP 11166409 A EP11166409 A EP 11166409A EP 2407244 B1 EP2407244 B1 EP 2407244B1
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Prior art keywords
grinding
grinding chamber
balls
chamber
fresh goods
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EP11166409.0A
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German (de)
French (fr)
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EP2407244A2 (en
EP2407244A3 (en
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Günter Guse
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ThyssenKrupp Industrial Solutions AG
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ThyssenKrupp Industrial Solutions AG
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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
    • B02C17/04—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 with unperforated container
    • B02C17/06—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 with unperforated container with several compartments
    • 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
    • B02C17/1835—Discharging devices combined with sorting or separating of material
    • B02C17/184—Discharging devices combined with sorting or separating of material with separator arranged in discharge path of crushing zone
    • B02C17/1845—Discharging devices combined with sorting or separating of material with separator arranged in discharge path of crushing zone with return of oversize material to crushing zone

Definitions

  • the invention relates to a method for comminuting regrind by means of a tube mill having at least a first and at least one second grinding chamber and a center discharge and a separator.
  • DE-A1-43 03 987 describes a tube mill, which is characterized by a trained as a deagglomerating drum first grinding chamber and a plurality of sectional and parallel to the axis of rotation arranged further grinding chambers.
  • a center discharge is provided between the deagglomerating drum and the sectional grinding chambers, which communicates with a separator.
  • the millbase will first give up the deagglomerating drum and then passes through the center discharge into the sifter, whereby its coarse material is returned to the sectional grinding chambers.
  • This grinding process is characterized by a low total energy requirement, because in the sectioned grinding chambers at any time crushing work is guaranteed.
  • the respective "unbalance moments" are minimized in each rotational position of the mill, which also contributes to reducing the specific energy consumption.
  • the DE 29 28 939 A1 describes a grinding process for different millbases to their respective required fineness, with neither the different millbases, nor the standing in contact with the millbase gases are mixed together.
  • a rotary tube mill with two completely separate from each other grinding chambers, wherein the rotary tube mill may also be part of a circulatory sifting mill, wherein the separately discharged from the two grinding chambers Mahlgut is each supplied to a separate separator.
  • the invention is an object of the invention to provide a method for crushing regrind by means of a tube mill and a separator, the one allows more efficient grinding of at least a first and a second Frischgutkomponente, wherein the first Frischgutkomponente is easier grindable than the second and the second Frischgutkomponente is more abrasive than the first.
  • the millbase required for this generally includes a relatively large proportion of relatively easily grindable limestone (first Frischgutkomponente) and a smaller part relatively difficult to grind sand (second Frischgutkomponente).
  • the limestone is usually pre-comminuted in so-called good bed roller mills and forms agglomerates.
  • the sand component such as blastfurnace slag, is already present in a fine-grained structure when introduced into tube mills and is usually abandoned together with the lime component of the first grinding chamber. Due to the lower grain size, this second component passes without significant comminution to the middle discharge and is fed from there to the classifier, where it is separated out as coarse material and fed to the second grinding chamber for comminution. In the previous grinding process, the second grinding component passes through the sifter for the first time without undergoing substantial grinding. Nevertheless, it causes wear on the classifier.
  • grinding balls are used in the first and second grinding chamber, which are made of different materials.
  • metallic grinding balls in particular steel balls
  • non-metallic grinding balls in particular ceramic balls
  • the first fresh material component is in particular lime-containing material and the second fresh-material component sand is the grinding chambers.
  • first grinding ball which have at least 1.0 times the diameter of the grinding balls of the second grinding chamber.
  • weight ratio of first to second Frischgutkomponente is preferably in the range of 80-95%.
  • a system for carrying out the method according to the invention is shown schematically. It consists essentially of a tube mill 1 with a first grinding chamber 2 and a second grinding chamber 3 and a center discharge 4. Furthermore, a separator 5 is provided. Each of the two grinding chambers 2, 3 has suitable feed devices for discharging a fresh material component 6 into the first grinding chamber 2 or a second fresh material component 7 into the second grinding chamber 3.
  • the center discharge 4 is connected via a suitable conveyor 8, for example, a bucket elevator, with the classifier 5, which may be a dynamic classifier.
  • the fines 9 of the classifier 5 is withdrawn as a finished product, while the coarse material 10 is supplied together with the second Frischgutkomponente 7 of the second grinding chamber 3. Only a small proportion of the coarse material can be given up to improve the flow and level control of the first grinding chamber 2, as indicated by the dashed line.
  • the first grinding chamber 2 In the two grinding chambers are grinding balls, wherein in the first grinding chamber steel balls and in the second grinding chamber ceramic balls are used.
  • the first Frischgutkomponente 6 of the first grinding chamber 2 is abandoned, where it is crushed by the contact with the steel balls and then passes through the center discharge 4 and the conveyor 8 in the classifier.
  • the coarse material 10 of the classifier 5 is abandoned together with the second Frischgutkomponente 7 of the second grinding chamber 3.
  • the material crushed there also passes through the center discharge 4 and the conveyor 8 into the classifier 5, where it is separated into finished product 9 and coarse material 10.
  • the first fresh material component 6 is lime-containing material and the second fresh-material component 7 Sand the grinding chambers 2 and 3 supplied.
  • the more difficult grindable and more abrasive sand thus comes into contact only with the ceramic balls located in the second grinding chamber 3.
  • the main crushing takes place, which happens primarily as Reibzerkleintation.
  • the abrasion of ceramic balls consists essentially of silicon and contains no iron or chromium, which would be detrimental to the production of white cement.

Description

Die Erfindung betrifft ein Verfahren zur Zerkleinerung von Mahlgut mit Hilfe einer Rohrmühle, die wenigstens eine erste und wenigstens eine zweite Mahlkammer und einen Mittenaustrag aufweist sowie einem Sichter.The invention relates to a method for comminuting regrind by means of a tube mill having at least a first and at least one second grinding chamber and a center discharge and a separator.

In der DE-A1-43 03 987 wird eine Rohrmühle beschrieben, die sich durch eine als Desagglomerier-Trommel ausgebildete erste Mahlkammer und mehrere sektional und parallel zur Drehachse angeordnete weitere Mahlkammern auszeichnet. Gemäß einem Ausführungsbeispiel ist zwischen der Desagglomerier-Trommel und den sektionalen Mahlkammern ein Mittenaustrag vorgesehen, der mit einem Sichter in Verbindung steht. Das Mahlgut wird zunächst der Desagglomerier-Trommel aufgeben und gelangt dann über den Mittenaustrag in den Sichter, wobei dessen Grobgut den sektionalen Mahlkammern zurückgeführt wird. Dieses Mahlverfahren zeichnet sich durch einen niedrigen Gesamtenergiebedarf aus, weil in den sektional angeordneten Mahlkammern zu jedem Zeitpunkt Zerkleinerungsarbeit gewährleistet wird. Auch sind bei dieser Rohrmühle die jeweiligen "Unbalance-Momente" in jeder Drehstellung der Mühle minimiert, was ebenfalls zur Reduzierung des spezifischen Energiebedarfs beiträgt.In the DE-A1-43 03 987 describes a tube mill, which is characterized by a trained as a deagglomerating drum first grinding chamber and a plurality of sectional and parallel to the axis of rotation arranged further grinding chambers. According to one embodiment, a center discharge is provided between the deagglomerating drum and the sectional grinding chambers, which communicates with a separator. The millbase will first give up the deagglomerating drum and then passes through the center discharge into the sifter, whereby its coarse material is returned to the sectional grinding chambers. This grinding process is characterized by a low total energy requirement, because in the sectioned grinding chambers at any time crushing work is guaranteed. Also, in this tube mill, the respective "unbalance moments" are minimized in each rotational position of the mill, which also contributes to reducing the specific energy consumption.

Die DE 29 28 939 A1 beschreibt ein Mahlverfahren für unterschiedliche Mahlgüter auf ihre jeweils erforderliche Mahlfeinheit, wobei weder die unterschiedlichen Mahlgüter, noch die mit den Mahlgütern im Kontakt stehenden Gase miteinander vermischt werden. Zur Anwendung kommt hierbei eine Drehrohrmühle mit zwei vollständig von einander getrennten Mahlkammern, wobei die Drehrohrmühle auch Bestandteil einer Umlauf-Sichter-Mahlanlage sein kann, wobei das getrennt voneinander aus den beiden Mahlkammern ausgetragene Mahlgut je einem separaten Sichter zugeführt wird.The DE 29 28 939 A1 describes a grinding process for different millbases to their respective required fineness, with neither the different millbases, nor the standing in contact with the millbase gases are mixed together. For this purpose, a rotary tube mill with two completely separate from each other grinding chambers, wherein the rotary tube mill may also be part of a circulatory sifting mill, wherein the separately discharged from the two grinding chambers Mahlgut is each supplied to a separate separator.

Der Erfindung liegt nun die Aufgabe zugrunde, ein Verfahren zur Zerkleinerung von Mahlgut mittels einer Rohrmühle sowie einem Sichter anzugeben, das eine effizientere Vermahlung von wenigstens einer ersten und einer zweiten Frischgutkomponente ermöglicht, wobei die erste Frischgutkomponente leichter mahlbar als die zweite ist und die zweite Frischgutkomponente verschleißender als die erste ist.The invention is an object of the invention to provide a method for crushing regrind by means of a tube mill and a separator, the one allows more efficient grinding of at least a first and a second Frischgutkomponente, wherein the first Frischgutkomponente is easier grindable than the second and the second Frischgutkomponente is more abrasive than the first.

Erfindungsgemäß wird diese Aufgabe durch die Merkmale des Anspruches 1 gelöst.According to the invention, this object is solved by the features of claim 1.

Das erfindungsgemäße Verfahren zur Zerkleinerung von Mahlgut verwendet eine Rohrmühle mit wenigstens einer ersten und einer zweiten Mahlkammer und einem Mittenaustrag sowie einen Sichter, wobei

  1. a. Mahlgut verwendet wird, das wenigstens einer ersten und einer zweiten Frischgutkomponente aufweist, wobei die erste Frischgutkomponente leichter mahlbar als die zweite ist und die zweite Frischgutkomponente verschleißender als die erste ist,
  2. b. die erste Frischgutkomponente der ersten Mahlkammer aufgegeben, dort unter Einwirkung von Mahlkugeln zerkleinert und über den Mittenaustrag ausgetragen wird,
  3. c. das aus der ersten Mahlkammer ausgetragene Mahlgut dem Sichter zugeführt wird,
  4. d. die zweite Frischgutkomponente zusammen mit Grobgut des Sichters der zweiten Mahlkammer zugefiihrt, dort unter Einwirkung von Mahlkugeln zerkleinert und über den Mittenaustrag ausgetragen wird,
  5. e. das aus der zweiten Mahlkammer ausgetragene Mahlgut dem Sichter zugeführt wird und
  6. f. das Feingut des Sichters als Fertiggut abgezogen wird.
The inventive method for comminution of regrind uses a tube mill with at least a first and a second grinding chamber and a center discharge and a separator, wherein
  1. a. Regrind is used which has at least a first and a second Frischgutkomponente, wherein the first Frischgutkomponente is easier grindable than the second and the second Frischgutkomponente is more abrasive than the first,
  2. b. the first Frischgutkomponente the first grinding chamber abandoned, crushed there under the action of grinding balls and discharged via the center discharge,
  3. c. the millbase discharged from the first grinding chamber is fed to the separator,
  4. d. the second Frischgutkomponente together with coarse material of the classifier fed to the second grinding chamber, there crushed under the action of grinding balls and discharged through the center discharge,
  5. e. the millbase discharged from the second grinding chamber is fed to the separator and
  6. f. the fines of the classifier are deducted as finished goods.

Dieses Verfahren kann insbesondere zur Herstellung von Zement vorteilhaft eingesetzt werden. Das hierfür erforderliche Mahlgut beinhaltet in der Regel einen relativ großen Anteil relativ leicht mahlbaren Kalkstein (erste Frischgutkomponente) und einen kleineren Teil relativ schwer mahlbaren Sand (zweite Frischgutkomponente).This method can be used advantageously in particular for the production of cement. The millbase required for this generally includes a relatively large proportion of relatively easily grindable limestone (first Frischgutkomponente) and a smaller part relatively difficult to grind sand (second Frischgutkomponente).

Der Kalkstein wird üblicherweise in sogenannte Gutbettwalzenmühlen vorzerkleinert und bildet dabei Agglomerate. Die Sandkomponente, beispielsweise Hüttensand, liegt beim Eintrag in Rohrmühlen bereits in feinkörniger Struktur vor und wird üblicherweise zusammen mit der Kalkkomponente der ersten Mahlkammer aufgegeben. Aufgrund der geringeren Körnung gelangt dieser zweite Komponente ohne signifikante Zerkleinerung zum Mittenaustrag und wird von dort dem Sichter zugeführt, wo sie als Grobgut ausgesondert und der zweiten Mahlkammer zur Zerkleinerung aufgegeben werden. Bei dem bisherigen Mahlverfahren durchläuft die zweite Mahlkomponente das erste Mal den Sichter, ohne dass sie eine wesentliche Mahlung erfährt. Dennoch verursacht sie am Sichter einen entsprechenden Verschleiß.The limestone is usually pre-comminuted in so-called good bed roller mills and forms agglomerates. The sand component, such as blastfurnace slag, is already present in a fine-grained structure when introduced into tube mills and is usually abandoned together with the lime component of the first grinding chamber. Due to the lower grain size, this second component passes without significant comminution to the middle discharge and is fed from there to the classifier, where it is separated out as coarse material and fed to the second grinding chamber for comminution. In the previous grinding process, the second grinding component passes through the sifter for the first time without undergoing substantial grinding. Nevertheless, it causes wear on the classifier.

Durch die erfindungsgemäße getrennte Aufgabe der zweiten Frischgutkomponente in die zweite Mahlkammer wird dies verhindert und die zweite Frischgutkomponente erfährt somit schon beim ersten Durchlauf der Mahlkammer eine effektive Zerkleinerung, bevor sie den Mittenaustrag erreicht und dem Sichter zugeführt wird. Auf diese Weise wird der Umlauffaktor für die zweite Frischgutkomponente vermindert und der gesamte Verschleiß minimiert, sodass sich eine effizientere Mahlung ergibt.This is prevented by the separate task of the second Frischgutkomponente in the second grinding chamber and the second Frischgutkomponente thus already undergoes effective comminution on the first pass of the grinding chamber before it reaches the center discharge and the sifter is supplied. In this way, the circulation factor for the second Frischgutkomponente is reduced and minimized the total wear, resulting in a more efficient grinding.

Zwar ist es bei Rohrmühlen mit zwei Mahlkammern bereits bekannt. Zuschlagsstoffe, wie Gips, direkt der zweiten Mahlkammer aufzugeben, hierbei handelt es sich aber nicht um eine schwerer mahlbare und verschleißendere Frischgutkomponente im Sinne der Erfindung.Although it is already known in tube mills with two grinding chambers. Adding additives, such as gypsum, directly to the second grinding chamber, but this is not a heavier grindable and more weary Frischgutkomponente in the context of the invention.

Weitere Ausgestaltungen der Erfindung sind Gegenstand der Unteransprüche.Further embodiments of the invention are the subject of the dependent claims.

Gemäß einer weiteren Ausgestaltung der Erfindung werden in der ersten und zweiten Mahlkammer Mahlkugeln verwendet, die aus unterschiedlichem Material gefertigt sind. So können in der ersten Mahlkammer insbesondere metallische Mahlkugeln, insbesondere Stahlkugeln, und in der zweiten Mahlkammer nicht metallische Mahlkugeln, insbesondere Keramikkugeln, zur Anwendung kommen.According to a further embodiment of the invention, grinding balls are used in the first and second grinding chamber, which are made of different materials. Thus, in the first grinding chamber, in particular metallic grinding balls, in particular steel balls, and non-metallic grinding balls, in particular ceramic balls, are used in the second grinding chamber.

Wird das Verfahren zur Zementherstellung eingesetzt, wird als erste Frischgutkomponente insbesondere kalkhaltiges Material und als zweite Frischgutkomponente Sand den Mahlkammern aufgegeben.If the process for cement production is used, the first fresh material component is in particular lime-containing material and the second fresh-material component sand is the grinding chambers.

Bei der Herstellung von Weißzement ist es von besonderem Vorteil, wenn in der zweiten Mahlkammer Keramikkugeln zum Einsatz kommen, da diese bei der Mahlarbeit keinen für das Endprodukt schädlichen Eisen- und Chromabrieb verursachen. Die Mahlarbeit in der ersten Mahlkammer, in der Stahlkugeln verwendet werden, ist vergleichsweise gering und liegt unter ca. 30 % der gesamten Mahlleistung. Da in der ersten Mahlkammer nur die leichter mahlbare Frischgutkomponente aufgegeben wird, hält sich der dort verursachte Eisen- und Chromabrieb in Grenzen. Die verschleißendere und schwerer mahlbare Frischgutkomponente wird direkt der zweiten Mahlkammer aufgegeben und kommt somit lediglich mit den Keramikkugeln in Kontakt, deren Abrieb vorwiegend aus Silizium besteht und kein Eisen oder Chrom enthält.In the production of white cement, it is particularly advantageous if ceramic balls are used in the second grinding chamber, since they do not cause any damage to the iron and chromium abrasion during the grinding work, which is detrimental to the end product. The grinding work in the first grinding chamber, in which steel balls are used, is comparatively low and is less than about 30% of the total grinding capacity. Since in the first grinding chamber only the easier grindable Frischgutkomponente is abandoned, the iron and chromium abrasion caused there kept within limits. The more abrasive and difficult to grind Frischgutkomponente is abandoned directly to the second grinding chamber and thus comes only with the ceramic balls in contact, the abrasion consists mainly of silicon and contains no iron or chromium.

Bei den der Erfindung zugrundeliegenden Versuchen hat sich herausgestellt, dass eine besonders effiziente Zerkleinerung dann erreicht werden kann, wenn in der ersten Mahlkammer Mahlkugeln zum Einsatz kommen, die wenigstens das 1,8-fache Gewicht der Mahlkugeln der zweiten Mahlkammer aufweisen.In the experiments on which the invention is based, it has been found that particularly efficient comminution can be achieved if grinding balls are used in the first grinding chamber which have at least 1.8 times the weight of the grinding balls of the second grinding chamber.

Weiterhin ist vorgesehen, dass in der ersten Mahlkammer Mahlkugeln zum Einsatz kommen, die wenigstens den 1,0-fachen Durchmesser der Mahlkugeln der zweiten Mahlkammer aufweisen. Weiterhin liegt das Gewichtsverhältnis von erster zu zweiter Frischgutkomponente vorzugsweise im Bereich von 80-95%.It is further provided that in the first grinding chamber grinding balls are used, which have at least 1.0 times the diameter of the grinding balls of the second grinding chamber. Furthermore, the weight ratio of first to second Frischgutkomponente is preferably in the range of 80-95%.

Weitere Ausgestaltungen und Vorteile der Erfindung werden anhand der folgenden Beschreibung und der Zeichnung näher erläutert.Further embodiments and advantages of the invention will be explained in more detail with reference to the following description and the drawing.

In der Zeichnung ist eine Anlage zur Durchführung des erfindungsgemäßen Verfahrens schematisch dargestellt. Sie besteht im Wesentlichen aus einer Rohrmühle 1 mit einer ersten Mahlkammer 2 und einer zweiten Mahlkammer 3 sowie einem Mittenaustrag 4. Weiterhin ist ein Sichter 5 vorgesehen. Jede der beiden Mahlkammern 2, 3 weist geeignete Zuführeinrichtungen zur Aufgabe einer Frischgutkomponente 6 in die ersten Mahlkammer 2 bzw. einer zweiten Frischgutkomponente 7 in die zweite Mahlkammer 3 auf. Der Mittenaustrag 4 steht über eine geeignete Fördereinrichtung 8, beispielsweise ein Becherwerk, mit dem Sichter 5 in Verbindung, bei dem es sich um einen dynamischen Sichter handeln kann.In the drawing, a system for carrying out the method according to the invention is shown schematically. It consists essentially of a tube mill 1 with a first grinding chamber 2 and a second grinding chamber 3 and a center discharge 4. Furthermore, a separator 5 is provided. Each of the two grinding chambers 2, 3 has suitable feed devices for discharging a fresh material component 6 into the first grinding chamber 2 or a second fresh material component 7 into the second grinding chamber 3. The center discharge 4 is connected via a suitable conveyor 8, for example, a bucket elevator, with the classifier 5, which may be a dynamic classifier.

Das Feingut 9 des Sichters 5 wird als Fertigprodukt abgezogen, während das Grobgut 10 zusammen mit der zweiten Frischgutkomponente 7 der zweiten Mahlkammer 3 zugeführt wird. Lediglich ein geringer Anteil des Grobgutes kann zur Fließverbesserung und Füllstandsregelung der ersten Mahlkammer 2 aufgegeben werden, wie dies durch die gestrichelte Linie angedeutet ist.The fines 9 of the classifier 5 is withdrawn as a finished product, while the coarse material 10 is supplied together with the second Frischgutkomponente 7 of the second grinding chamber 3. Only a small proportion of the coarse material can be given up to improve the flow and level control of the first grinding chamber 2, as indicated by the dashed line.

In den beiden Mahlkammern befinden sich Mahlkugeln, wobei in der ersten Mahlkammer Stahlkugeln und in der zweiten Mahlkammer Keramikkugeln zur Anwendung kommen. Im Betrieb wird die erste Frischgutkomponente 6 der ersten Mahlkammer 2 aufgegeben, wo sie durch den Kontakt mit dem Stahlkugeln zerkleinert wird und anschließend über den Mittenaustrag 4 und die Fördereinrichtung 8 in den Sichter gelangt. Das Grobgut 10 des Sichters 5 wird zusammen mit der zweiten Frischgutkomponente 7 der zweiten Mahlkammer 3 aufgegeben. Das dort zerkleinerte Material gelangt ebenfalls über den Mittenaustrag 4 und die Fördereinrichtung 8 in den Sichter 5, wo es in Fertiggut 9 und Grobgut 10 getrennt wird.In the two grinding chambers are grinding balls, wherein in the first grinding chamber steel balls and in the second grinding chamber ceramic balls are used. In operation, the first Frischgutkomponente 6 of the first grinding chamber 2 is abandoned, where it is crushed by the contact with the steel balls and then passes through the center discharge 4 and the conveyor 8 in the classifier. The coarse material 10 of the classifier 5 is abandoned together with the second Frischgutkomponente 7 of the second grinding chamber 3. The material crushed there also passes through the center discharge 4 and the conveyor 8 into the classifier 5, where it is separated into finished product 9 and coarse material 10.

Bei der Herstellung von Zement, insbesondere von Weißzement, wird als erste Frischgutkomponente 6 kalkhaltiges Material und als zweite Frischgutkomponente 7 Sand den Mahlkammern 2 bzw. 3 zugeführt. Der schwerer mahlbare und verschleißendere Sand kommt somit lediglich mit den in der zweiten Mahlkammer 3 befindlichen Keramikkugeln in Kontakt. In dieser Mahlkammer findet die Hauptzerkleinerung statt, die vorwiegend als Reibzerkleinerung geschieht. Der Abrieb von Keramikkugeln besteht im Wesentlichen aus Silizium und enthält kein Eisen oder Chrom, welches für die Weißzementherstellung schädlich wäre.In the production of cement, in particular white cement, the first fresh material component 6 is lime-containing material and the second fresh-material component 7 Sand the grinding chambers 2 and 3 supplied. The more difficult grindable and more abrasive sand thus comes into contact only with the ceramic balls located in the second grinding chamber 3. In this grinding chamber, the main crushing takes place, which happens primarily as Reibzerkleinerung. The abrasion of ceramic balls consists essentially of silicon and contains no iron or chromium, which would be detrimental to the production of white cement.

Die getrennte Frischgutkomponenten bewirkt somit nicht nur eine effizientere Mahlung, sondern ermöglicht auch eine sehr vorteilhafte Herstellung von Weißzement.The separate Frischgutkomponenten thus not only causes a more efficient grinding, but also allows a very advantageous production of white cement.

Claims (7)

  1. Method for grinding grist with the aid of a tube mill (1) with at least one first and at least one second grinding chamber (2, 3) and a central output (4) as well as a separator (5), whereby
    a. grist comprising at least one first and one second fresh goods component (6, 7) is used, whereby the first fresh goods component (6) is easier to grind than the second, and the second fresh goods component (7) is more abrasive than the first,
    b. the first fresh goods component (6) is added to the first grinding chamber (2), ground there under the influence of grinding balls, and discharged via the central output (4),
    c. the grist discharged from the first grinding chamber (2) is supplied to the separator (5),
    d. the second fresh goods component (7) is supplied to the separator (5) of the second grinding chamber (3) together with coarse material (10), ground under the influence of grinding balls there, and discharged via the central output (4),
    e. the grist discharged from the second grinding chamber (3) is supplied to the separator (5), and
    f. fine material (9) from the separator (5) is extracted in the form of a finished product.
  2. Method according to claim 1, characterised in that grinding balls made of different materials are used in the first and second grinding chamber (2, 3).
  3. Method according to claim 2, characterised in that metal grinding balls, in particular steel balls, are used in the first grinding chamber (2), and non-metal grinding balls, in particular ceramic balls, are used in the second grinding chamber (3).
  4. Method according to claim 1, characterised in that calciferous material is added to the grinding chambers (2, 3) as the first fresh goods component (6), and sand is added as the second fresh goods component (7).
  5. Method according to claim 1, characterised in that grinding balls with a weight of at least 1.8 times that of the grinding balls of the second grinding chamber (3) are used in the first grinding chamber (2).
  6. Method according to claim 1, characterised in that grinding balls with a diameter of at least 1.0 times that of the grinding balls of the second grinding chamber (3) are used in the first grinding chamber (2).
  7. Method according to claim 1, characterised in that the weight ratio of the first to the second fresh goods component (6, 7) lies within a range of 80% to 95%.
EP11166409.0A 2010-06-16 2011-05-17 Method for comminution of material by a tube mill Not-in-force EP2407244B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE201010017394 DE102010017394A1 (en) 2010-06-16 2010-06-16 Process for comminuting regrind by means of a tube mill

Publications (3)

Publication Number Publication Date
EP2407244A2 EP2407244A2 (en) 2012-01-18
EP2407244A3 EP2407244A3 (en) 2014-12-24
EP2407244B1 true EP2407244B1 (en) 2015-07-15

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Application Number Title Priority Date Filing Date
EP11166409.0A Not-in-force EP2407244B1 (en) 2010-06-16 2011-05-17 Method for comminution of material by a tube mill

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EP (1) EP2407244B1 (en)
CN (1) CN102284323B (en)
DE (1) DE102010017394A1 (en)
DK (1) DK2407244T3 (en)
ES (1) ES2547335T3 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102941142B (en) * 2012-10-17 2014-12-10 武汉利之达科技有限公司 Central-discharged drying-grinding mill with variable cylinder diameter
CN104096631B (en) * 2013-04-12 2016-08-03 宝山钢铁股份有限公司 Rod mill splash bar control method
CN104941738B (en) * 2015-06-16 2017-05-03 张志村 Assembling method of general cement ball mill high in grinding efficiency and low in power consumption

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2928939A1 (en) * 1979-07-18 1981-02-12 Kloeckner Humboldt Deutz Ag Tube mill with two grinding chambers - has chambers completely separated by partition for simultaneous grinding of two different materials
CN1013553B (en) * 1989-09-25 1991-08-21 国家建筑材料工业局合肥水泥研究设计院 Tumbling mill
CN2096412U (en) * 1991-06-28 1992-02-19 柳长松 Energy saving tube type grinder
DE4303987A1 (en) 1993-02-11 1994-08-18 Kloeckner Humboldt Deutz Ag Grinding process and associated grinding plant
EP0965387B1 (en) * 1998-06-17 2006-08-23 Ömag-Montananlagenbau GmbH Mill for treating, respectively milling, solid material
AU2002352181A1 (en) * 2001-11-29 2003-06-10 Polysius Ag Tube grinder and method for comminuting lumpy grinding stock
DE102004045959A1 (en) * 2004-09-22 2006-03-23 Polysius Ag Mill material milling system, has rough mill area that is formed in such a manner that less than twenty five percent of applied driving power of pipe mill is transferred within rough mill area
CN2761272Y (en) * 2005-01-06 2006-03-01 合肥水泥研究设计院 Slag micropowder tube mill

Also Published As

Publication number Publication date
CN102284323B (en) 2014-11-26
CN102284323A (en) 2011-12-21
ES2547335T3 (en) 2015-10-05
DE102010017394A1 (en) 2011-12-22
DK2407244T3 (en) 2015-10-12
EP2407244A2 (en) 2012-01-18
EP2407244A3 (en) 2014-12-24

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