EP0221377A2 - Method of finely grinding mineral material and device for carrying out the method - Google Patents

Method of finely grinding mineral material and device for carrying out the method Download PDF

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Publication number
EP0221377A2
EP0221377A2 EP86113849A EP86113849A EP0221377A2 EP 0221377 A2 EP0221377 A2 EP 0221377A2 EP 86113849 A EP86113849 A EP 86113849A EP 86113849 A EP86113849 A EP 86113849A EP 0221377 A2 EP0221377 A2 EP 0221377A2
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EP
European Patent Office
Prior art keywords
grinding
tubes
planetary mill
mill
classifier
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EP86113849A
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German (de)
French (fr)
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EP0221377A3 (en
Inventor
Horst Auerbach
Hermann Dörr
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Fried Krupp AG
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Fried Krupp 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
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/18—Adding fluid, other than for crushing or disintegrating by fluid energy
    • B02C23/24—Passing gas through crushing or disintegrating zone
    • B02C23/32—Passing gas through crushing or disintegrating zone with return of oversize material to crushing or disintegrating zone
    • 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
    • B02C17/08—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 containers performing a planetary movement

Definitions

  • the invention relates to a method for the very fine comminution of mineral substances, in particular mineral raw materials in the dry state using a planetary mill according to the preamble of claim 1, and an associated device.
  • the planetary mill or planetary ball mill is a centrifugal ball mill provided with a plurality of grinding tubes, in which the grinding tubes arranged in a parallel axis rotate around a likewise parallel main axis of rotation under their own rotation.
  • a method for the very fine comminution of this type is known using a planetary mill for the treatment of very fine ore, e.g. Lead-zinc ores, which are then subjected to flotation.
  • very fine ore e.g. Lead-zinc ores
  • the axes of the grinding tubes of the planetary ball mill are arranged horizontally in the usual way.
  • the invention has for its object to provide a method with which the fine crushing of rock in the dry state can be carried out economically using a planetary mill.
  • the method according to the invention is for all mineral substances that are not too hard, in particular raw materials, such as e.g. Lignite and hard coal, bauxite, but also uranium ores and copper pebbles, cement clinker and quartz, but particularly advantageously for rocks containing calcium carbonate, such as limestone, marble, chalk, dolomite and similar rocks.
  • raw materials such as e.g. Lignite and hard coal, bauxite, but also uranium ores and copper pebbles, cement clinker and quartz, but particularly advantageously for rocks containing calcium carbonate, such as limestone, marble, chalk, dolomite and similar rocks.
  • the measure of arranging the axes of the grinding tubes to the horizontal at a certain inclination below 30 ° ensures that the residence time of the material to be ground in the grinding tubes can be adjusted almost optimally in each individual case. Sufficient fine grinding is thereby achieved without an uneconomical "over-grinding".
  • the angle to be set depends on the particular nature of the ground material, in particular on its grindability. As the grindability deteriorates, the tendency is reduced and vice versa. When running in the system with a certain regrind or when changing the regrind, the most favorable inclination setting can be tried out. Generally good results can be achieved if the axes of the grinding tubes are inclined 5 to 20 ° to the horizontal.
  • the ratio of the circulation frequency grinding tube track / grinding tube is preferably set so that it is 0.45 to 0.65. It has surprisingly been found that the most favorable milling results have been achieved in this area.
  • the material of the grinding tube wall is matched to the grinding material used in such a way that the coefficient of static friction is reduced.
  • suitable grinding media of the same type as the material to be ground results in greater economy in that these grinding media can be manufactured cheaper than the steel grinding media which are usually used.
  • a particularly precise setting of the degree of comminution and further improvements in economy can be achieved in that a sifter is connected in the circuit to the planetary mill and the coarse material separated in this sifter is returned in the circuit.
  • the classifier which is adapted to a sufficient fine comminution in the selectivity, preferably has separation limits in the range of ⁇ 40 ⁇ m.
  • a so-called channel wheel classifier is particularly suitable.
  • the regrind is fed to the classifier, a channel wheel classifier, which separates out already finely comminuted regrind as a finished product.
  • the coarser ground material separated out by the classifier, the so-called semolina is fed to an inclined planetary mill, as shown in FIG. 2, for comminution.
  • the shredded regrind, the so-called mill discharge is returned to the circuit and given to the classifier together with fresh regrind. In this way it is ensured that when using only a single classifier the ground product always has the desired fineness.
  • the gear block 6 causes the rotation of the grinding tubes 2 and 3 about the main axis of rotation 1 and the simultaneous, but opposite rotation about their own axes of rotation 8 and 9 by means of built-in drive means.
  • the grinding tubes 2 and 3 each have one above their near the end of their entry Cross section extending inlet slot wall 10.
  • the discharge wall 11 located at the end at the discharge end of the grinding tubes 2 and 3 is provided with an annular, coaxial slot 12 for the ground material to pass through.
  • Lifting strips 13 arranged on the inner wall of the grinding tube each extend in the axial direction between the inlet slot wall 10 and the discharge wall 11.
  • the bearing 5 is supported on the machine corridor 4 via an adjusting spindle 20 articulated at both ends and the bearing housing 7 via two pivot bearings 21 which are arranged in the same axis.
  • the axes of the pivot bearings 21 and the joints of the adjusting spindle 20 each run perpendicular to the main axis of rotation 1.
  • the ground material passes through a fixedly arranged inlet funnel 14 via a screw conveyor 19 and then via a distributor 15 held in the bearing 5, the two tubular arms of which each open into a flange-shaped inlet 16, which simultaneously serves to support the inlet end of the respective grinding tube.
  • the regrind then arrives in the working space of the respective grinding tube, where it is comminuted by the grinding media located therein and passed through the annular slot 12 into a downstream discharge tube 17 and is then discharged from the device via a collecting housing 18.
  • the discharge tubes 17 penetrate the gear block 6 coaxially with the axes of rotation 8 and 9 of the grinding tubes 2 and 3. Parts of the planetary mill rotating against each other are each provided with suitable sealing elements.
  • a planetary mill system corresponding to FIG. 2 is preferably designed so that its grinding drums have a clear diameter of 450 mm and an effective length of 900 mm, and the rotational frequency of the grinding tubes on the grinding tube track is set at 135 min ⁇ 1.
  • the natural frequency of the grinding tubes is 270 min ⁇ 1, which gives a grinding force of 9 g in operation with a diameter of the grinding tube track of 900 mm.
  • the height of the lifting strips is adapted to the grinding media used so that it is between 0.5 and 1.5 times the maximum grinding media diameter and is preferably set to about 0.9 times the maximum grinding media diameter.
  • the number of lifting bars depends on the clear diameter of the milling drum, but is at least 4.
  • the distance between the lifting bars evenly distributed on the circumference of the milling drum should not exceed 0.3 m and not less than 0.1 m. A distance of between 0.15 and 0.2 m is advantageous.
  • the distributor 15 downstream of the feed hopper 14 is mounted in such a way that its speed can be set independently of the rotational frequency of the grinding tubes and is operated at a 2.5- to 4-fold rotational frequency, based on the grinding tube path. In this way, congestion of the ground material can be avoided with certainty.
  • a planetary mill was used on a semi-industrial scale, which was constructed like the exemplary embodiment according to FIG. 2.
  • the inside diameter of the grinding tubes was 120 mm, the effective length of the grinding tubes was 210 mm.
  • the inclination of the main axis of rotation was set to 18 °.
  • limestone with a grain size of 1 to 3.15 mm was used as a regrind in a product rate of 25 kg / g.
  • the number of cycles, that is the ratio of the mass flow of the mill discharge to that of the ground product was 2.5. This resulted in a centrifugal force of 13 g.
  • the spherical grinding media had an average diameter of 7.2 mm and were made of steel.
  • the degree of filling of the grinding media in the grinding tubes was 0.4.
  • the planetary mill was preceded by a channel wheel classifier according to the flow diagram according to FIG. 1.
  • the ground product separated from the sewer sifter had a fineness of ⁇ 24 ⁇ m at 100% of the discharge.
  • the specific energy requirement for the grinding was below 50 kWh / t of the grinding product produced.
  • cement binder was processed into fine cement.
  • the inclination of the grinding tube axes was set to 15 °.
  • the product rate was 4 kg / h with a feed grain size ⁇ 3 mm.
  • the number of cycles was 4 and the degree of filling of the grinding media was again 0.4.
  • the resulting centrifugal force was 3 g.
  • the fineness of the ground product was 5000 cm2 / g according to Blaine.

Abstract

In a method for finely grinding mineral materials, in particular mineral raw materials, in the dry state using a planet mill, whose at least two mill tubes provided in each case with lifting bars extending in the axial direction have in each case a diameter which is 1.5 to 4 times smaller than their orbit and are operated with such a revolving frequency that the centrifugal forces occurring are between 2.5 and 15 g, a relatively large degree of economy of the grinding is achieved in that the axes of the mill tubes of the planet ball mill are arranged inclined to the horizontal and the ratio of the revolving frequency of mill tube path/mill tube is set at 0.4:0.8.

Description

Die Erfindung bezieht sich auf ein Verfahren zur Feinst­zerkleinerung von mineralischen Stoffen, insbesondere minera­lischen Rohstoffen im trockenen Zustand unter Verwendung einer Planetenmühle nach dem Oberbegriff des Anspruchs 1, und eine zugehörige Vorrichtung.The invention relates to a method for the very fine comminution of mineral substances, in particular mineral raw materials in the dry state using a planetary mill according to the preamble of claim 1, and an associated device.

Die Planetenmühle oder Planetenkugelmühle ist eine mit mehreren Mahlrohren versehene Fliekraftkugelmühle, bei der die parallelachsig angeordneten Mahlrohre unter Eigendrehung um eine ebenfalls parallele Hauptdrehachse umlaufen.The planetary mill or planetary ball mill is a centrifugal ball mill provided with a plurality of grinding tubes, in which the grinding tubes arranged in a parallel axis rotate around a likewise parallel main axis of rotation under their own rotation.

Bekannt ist ein Verfahren zur Feinstzerkleinerung dieser Art unter Anwendung einer Planetenmühle zur Aufbereitung feinstverwachsener Erze, wie z.B. Blei-Zink-Erzen, die anschließend einer Flotation unterzogen werden. Die Achsen der Mahlrohre der Planetenkugelmühle sind da­bei in üblicher Weise horizontal angeordnet.A method for the very fine comminution of this type is known using a planetary mill for the treatment of very fine ore, e.g. Lead-zinc ores, which are then subjected to flotation. The axes of the grinding tubes of the planetary ball mill are arranged horizontally in the usual way.

Es sind ferner Verfahren zur Zerkleinerung von Mahlgut mit einer Planetenmühle vorbekannt, bei denen die Achsen der Mahlrohre senkrecht oder nahezu senkrecht angeordnet sind. Diese Anordnung hat den Nachteil, daß durch eine zu geringe Verweilzeit in der Planetenmühle eine Feinst­zerkleinerung nicht erzielbar ist.Methods for comminuting regrind with a planetary mill are also known, in which the axes of the grinding tubes are arranged vertically or almost vertically. This arrangement has the disadvantage that very fine comminution cannot be achieved due to a too short dwell time in the planetary mill.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren zu schaffen, mit dem die Feinstzerkleinerung von Ge­stein im trockenen Zustand unter Verwendung einer Planetenmühle auf wirtschaftliche Weise durchgeführt werden kann.The invention has for its object to provide a method with which the fine crushing of rock in the dry state can be carried out economically using a planetary mill.

Bei einem Verfahren der eingangs genannten Art liegt die Lösung dieser Aufgabe in den Merkmalen des kenn­zeichnenden Teils des Anspruchs 1.In a method of the type mentioned above the solution of this problem in the features of the characterizing part of claim 1.

Das Verfahren nach der Erfindung ist für alle nicht zu harten mineralischen Stoffe, insbesondere Rohstoffe, wie z.B. Braun- und Steinkohlen, Bauxite, aber auch Uranerze und Kupferkiese, Zementklinker und Quarze, besonders vorteilhaft jedoch für kalziumkarbonathaltige Gesteine, wie Kalkstein, Marmor, Kreide, Dolomit und ähnliche Gesteine einsetzbar.The method according to the invention is for all mineral substances that are not too hard, in particular raw materials, such as e.g. Lignite and hard coal, bauxite, but also uranium ores and copper pebbles, cement clinker and quartz, but particularly advantageously for rocks containing calcium carbonate, such as limestone, marble, chalk, dolomite and similar rocks.

Überraschend hat sich gezeigt, daß mit dem neuen Verfahren bei den genannten Stoffen gute Zerkleinerungswerte unter wirtschaftlichen Bedingungen erzielt werden können. Dabei ist das Verfahren sehr variabel zu führen und ins­besondere an die verschiedenen Mahlgüter anpaßbar.Surprisingly, it has been shown that good grinding values can be achieved under economic conditions with the new process for the substances mentioned. The process can be carried out very variably and, in particular, can be adapted to the different regrinds.

Durch die Maßnahme, die Achsen der Mahlrohre zur Horizontalen unter einer gewissen Neigung unterhalb von 30° anzuordnen, wird erreicht, daß die Verweilzeit des Mahlgutes in den Mahlrohren auf den Einzelfall nahezu optimal einstellbar ist. Dadurch wird eine ausreichende Feinstzerkleinerung erzielt, ohne daß ein unwirtschaftli­ches "Übermahlen" eintritt. Der einzustellenden Winkel richtet sich dabei nach der jeweiligen Beschaffenheit des Mahlgutes, insbesondere nach dessen Mahlbarkeit. Mit schlechter werdender Mahlbarkeit wird die Neigung ver­ringert und umgekehrt. Beim Einfahren der Anlage mit einem bestimmten Mahlgut oder beim Mahlgutwechsel kann die günstigste Neigungseinstellung ausprobiert werden. Allgemein gute Ergebnisse sind zu erzielen, wenn die Achsen der Mahlrohre 5 bis 20° zur Horizontalen geneigt angeordnet sind.The measure of arranging the axes of the grinding tubes to the horizontal at a certain inclination below 30 ° ensures that the residence time of the material to be ground in the grinding tubes can be adjusted almost optimally in each individual case. Sufficient fine grinding is thereby achieved without an uneconomical "over-grinding". The angle to be set depends on the particular nature of the ground material, in particular on its grindability. As the grindability deteriorates, the tendency is reduced and vice versa. When running in the system with a certain regrind or when changing the regrind, the most favorable inclination setting can be tried out. Generally good results can be achieved if the axes of the grinding tubes are inclined 5 to 20 ° to the horizontal.

Bevorzugt wird das Verhältnis der Umlauffrequenz Mahl­rohrbahn/Mahlrohr so eingestellt, daß es 0,45 bis 0,65 beträgt. Es ist überraschend gefunden worden, daß in diesem Bereich die günstigsten Mahlergebnisse erzielt worden sind.The ratio of the circulation frequency grinding tube track / grinding tube is preferably set so that it is 0.45 to 0.65. It has surprisingly been found that the most favorable milling results have been achieved in this area.

Weiter verbesserte Ergebnisse sind erzielbar, wenn die Mahlrohre mit einem Luftstrom von 0,2 bis 1 m/s, vorzugsweise 0,4 bis 0,6 m/s beaufschlagt werden. Dadurch werden die bereits in ausreichendem Umfang zerkleinerten Partikel beschleunigt ausgetragen.Further improved results can be achieved if the grinding tubes are subjected to an air flow of 0.2 to 1 m / s, preferably 0.4 to 0.6 m / s. As a result, the particles that have already been comminuted to a sufficient extent are discharged at an accelerated rate.

Von besonderem Vorteil ist es ferner, wenn der Werk­stoff der Mahlrohrwand so auf das eingesetzte Mahlgut abgestimmt wird, daß der Hafttreibungsbeiwert verringert wird. Der zumindest teilweise Einsatz geeigneter Mahl­körper der gleichen Art wie das Mahlgut ergibt eine größere Wirtschaftlichkeit dadurch, daß diese Mahl­körper billiger als die Mahlkörper aus Stahl, die üblicherweise verwendet werden, gefertigt werden können.It is also particularly advantageous if the material of the grinding tube wall is matched to the grinding material used in such a way that the coefficient of static friction is reduced. The at least partial use of suitable grinding media of the same type as the material to be ground results in greater economy in that these grinding media can be manufactured cheaper than the steel grinding media which are usually used.

Eine besonders genaue Einstellung des Zerkleinerungs­grades und weitere Verbesserungen der Wirtschaftlichkeit läßt sich dadurch erzielen, daß der Planetenmühle ein Sichter im Kreislauf zugeschaltet wird und das in diesem Sichter abgeschiedene Grobgut im Kreislauf zurückge­führt wird. Der einer ausreichenden Feinstzerkleinerung in der Trennschärfe angepaßte Sichter weist vorzugsweise Trenngrenzen im Bereich von < 40 µm auf. Besonders ge­eignet ist ein sogenannter Kanalradsichter.A particularly precise setting of the degree of comminution and further improvements in economy can be achieved in that a sifter is connected in the circuit to the planetary mill and the coarse material separated in this sifter is returned in the circuit. The classifier, which is adapted to a sufficient fine comminution in the selectivity, preferably has separation limits in the range of <40 μm. A so-called channel wheel classifier is particularly suitable.

Mit dem Verfahren nach der Erfindung kann eine Feinst­zerkleinerung durch Trockenmahlung auch bei stark backendem Mahlgut erzielt werden. Gegenüber einer in solchen Fällen sonst erforderlichen Naßmahlung, bei welcher wesentlich mehr Material bewegt wird und ent­sprechend höherer Verschleiß auftritt, bringt der Ein­satz der Trockenmahlung erhebliche Vorteile. Die er­forderliche Mahlanlage weist ein entsprechend geringeres Gewicht und niedrigere Herstellungskosten auf.With the method according to the invention, very fine comminution can be achieved by dry grinding, even with heavily baking regrind. Compared to wet grinding, which is otherwise necessary in such cases, in which considerably more material is moved and correspondingly higher wear occurs, the use of dry grinding has considerable advantages. The required grinding plant has a correspondingly lower weight and lower production costs.

Ausführungsbeispiele der Erfindung sind anhand der Zeichnung nachfolgend näher erläutert. Es zeigen

  • Fig. 1 ein Flußbild eines Ausführungsbeispiels des neuen Verfahrens und
  • Fig. 2 schematisch den Aufbau einer dabei eingesetzten Planetenmühle im senkrechten Schnitt.
Embodiments of the invention are explained in more detail below with reference to the drawing. Show it
  • Fig. 1 is a flow chart of an embodiment of the new method and
  • Fig. 2 shows schematically the structure of a planetary mill used in vertical section.

Wie aus Fig. 1 ersichtlich, wird das Mahlgut dem Sichter, einem Kanalradsichter aufgegeben, der bereits feinst­zerkleinertes Mahlgut als fertiges Mahlprodukt aus­scheidet. Das vom Sichter ausgeschiedene gröbere Mahl­gut, die sogenannte Griesse, wird einer geneigt ange­ordneten Planetenmühle, wie es Fig. 2 zeigt, zum Zer­kleinern aufgegeben. Nach dem Durchlauf durch die Pla­netenmühle wird das zerkleinerte Mahlgut, der sogenannte Mühlenaustrag, im Kreislauf zurückgeführt und zusammen mit frischem Mahlgut dem Sichter wieder aufgegeben. Auf diese Weise ist sichergestellt, daß bei Verwendung nur eines einzigen Sichters das Mahlprodukt stets die gewünschte Feinheit aufweist.As can be seen from FIG. 1, the regrind is fed to the classifier, a channel wheel classifier, which separates out already finely comminuted regrind as a finished product. The coarser ground material separated out by the classifier, the so-called semolina, is fed to an inclined planetary mill, as shown in FIG. 2, for comminution. After passing through the planetary mill, the shredded regrind, the so-called mill discharge, is returned to the circuit and given to the classifier together with fresh regrind. In this way it is ensured that when using only a single classifier the ground product always has the desired fineness.

In der Darstellung nach Fig. 2 ist erkennbar, daß die Hauptdrehachse 1, um welche sich die Mahlrohre 2 und 3 einer Planetenmühle drehen, gegenüber der Horizontalen des Maschinenflurs 4 um etwa 20° geneigt angeorndet ist. Einlaufseitig ist die Planetenmühle auf ein Lager 5 drehbar abgestützt, während austragsseitig ein zylin­drischer Getriebeblock 6 in einem Lagergehäuse 7 um­läuft. Der Getriebeblock 6 bewirkt durch eingebaute entsprechende Antriebsmittel die Drehung der Mahlrohre 2 und 3 um die Hauptdrehachse 1 und die gleichzeitige, jedoch entgegengerichtete Drehung um deren eigene Dreh­achsen 8 und 9. Die Mahlrohre 2 und 3 weisen in der Nähe ihres Eintragsendes jeweils eine sich über ihren Quer­schnitt erstreckende Einlaufschlitzwand 10 auf. Die stirnseitig am Austragsende der Mahlrohre 2 und 3 jeweils befindliche Austragswand 11 ist mit einem ringförmigen, koaxialen Schlitz 12 für den Mahlgutdurchtritt versehen. Zwischen der Einlaufschlitzwand 10 und der Austrags­wand 11 erstrecken sich jeweils an der Innenwand des Mahlrohrs angeordnete Hubleisten 13 in axialer Richtung.2 that the main axis of rotation 1, about which the grinding tubes 2 and 3 of a planetary mill rotate, is arranged inclined by approximately 20 ° with respect to the horizontal of the machine corridor 4. On the inlet side, the planetary mill is rotatably supported on a bearing 5, while on the discharge side a cylindrical gear block 6 rotates in a bearing housing 7. The gear block 6 causes the rotation of the grinding tubes 2 and 3 about the main axis of rotation 1 and the simultaneous, but opposite rotation about their own axes of rotation 8 and 9 by means of built-in drive means. The grinding tubes 2 and 3 each have one above their near the end of their entry Cross section extending inlet slot wall 10. The discharge wall 11 located at the end at the discharge end of the grinding tubes 2 and 3 is provided with an annular, coaxial slot 12 for the ground material to pass through. Lifting strips 13 arranged on the inner wall of the grinding tube each extend in the axial direction between the inlet slot wall 10 and the discharge wall 11.

Um die Verstellung der Neigung der Hauptdrehachse 1 gegenüber der Horizontalen bei der Planetenmühle auf einfache Weise durchführen zu können, ist das Lager 5 über eine beidendig angelenkte Verstellspindel 20 und das Lagergehäuse 7 über zwei achsgleich angeordnete Schwenklager 21 auf dem Maschinenflur 4 abgestützt. Dadurch ergibt sich vorteilhaft eine statisch bestimmte Dreipunktlagerung der Anlage. Die Achsen der Schwenklager 21 und der Gelenke der Verstellspindel 20 verlaufen je­weils senkrecht zur Hauptdrehachse 1.In order to be able to easily adjust the inclination of the main axis of rotation 1 with respect to the horizontal at the planetary mill, the bearing 5 is supported on the machine corridor 4 via an adjusting spindle 20 articulated at both ends and the bearing housing 7 via two pivot bearings 21 which are arranged in the same axis. This advantageously results in a statically determined three-point mounting of the system. The axes of the pivot bearings 21 and the joints of the adjusting spindle 20 each run perpendicular to the main axis of rotation 1.

Das Mahlgut gelangt durch einen feststehend angeordneten Einlauftrichter 14 über eine Förderschnecke 19 und anschließend über einen im Lager 5 gehaltenen Verteiler 15, dessen zwei rohrförmige Arme jeweils in einen flanschförmigen Einlauf 16 münden, welcher gleichzeitig der Lagerung des Einlaufenden des jeweiligen Mahlrohrs dient. Durch die Einlaufschlitzwand 10 gelangt das Mahl­gut anschließend in den Arbeitsraum des jeweiligen Mahl­rohrs, wo es durch die darin befindlichen Mahlkörper zerkleinert wird und durch den ringförmigen Schlitz 12 in ein nachgeschaltetes Austragsrohr 17 weitergeleitet und danach über ein Auffanggehäuse 18 aus der Einrichtung ausgetragen wird. Die Austragsrohre 17 durchdringen koaxial zu den Drehachsen 8 und 9 der Mahlrohre 2 und 3 den Ge­triebeblock 6. Gegeneinander drehende Teile der Planeten­mühle sind jeweils mit geeigneten Abdichtungselementen versehen.The ground material passes through a fixedly arranged inlet funnel 14 via a screw conveyor 19 and then via a distributor 15 held in the bearing 5, the two tubular arms of which each open into a flange-shaped inlet 16, which simultaneously serves to support the inlet end of the respective grinding tube. Through the inlet slot wall 10, the regrind then arrives in the working space of the respective grinding tube, where it is comminuted by the grinding media located therein and passed through the annular slot 12 into a downstream discharge tube 17 and is then discharged from the device via a collecting housing 18. The discharge tubes 17 penetrate the gear block 6 coaxially with the axes of rotation 8 and 9 of the grinding tubes 2 and 3. Parts of the planetary mill rotating against each other are each provided with suitable sealing elements.

Eine der Fig. 2 entsprechende Planetenmühlen-Anlage wird bevorzugt so ausgeführt, daß deren Mahltrommeln einen lichten Durchmesser von 450 mm und eine wirksame Länge von 900 mm aufweisen, und die Drehfrequenz der Mahlrohre auf der Mahlrohrbahn mit 135 min⁻¹ eingestellt wird. Die Eigenfrequenz der Mahlrohre liegt bei 270 min⁻¹, woraus sich bei einem Durchmesser der Mahlrohrbahn von 900 mm im Betrieb eine Fleihkraft von 9 g ergibt. Die Höhe der Hubleisten wird den eingesetzten Mahlkörpern so angepaßt, daß sie zwischen dem 0,5- und 1,5-fachen der maximalen Mahlkörperdurchmesser liegt und bevorzugt auf das etwa 0,9-fache des maximalen Mahlkörperdurch­messers eingestellt wird. Die Anzahl der Hubleisten richtet sich nach dem lichten Durchmesser der Mahl­trommel, beträgt jedoch mindestens 4. Der Abstand der auf den Mahltrommelumfang gleichmäßig verteilten Hub­leisten soll 0,3 m nicht über- und 0,1 m nicht unter­schreiten. Vorteilhaft ist ein Abstand, der zwischen 0,15 und 0,2 m liegt.A planetary mill system corresponding to FIG. 2 is preferably designed so that its grinding drums have a clear diameter of 450 mm and an effective length of 900 mm, and the rotational frequency of the grinding tubes on the grinding tube track is set at 135 min⁻¹. The natural frequency of the grinding tubes is 270 min⁻¹, which gives a grinding force of 9 g in operation with a diameter of the grinding tube track of 900 mm. The height of the lifting strips is adapted to the grinding media used so that it is between 0.5 and 1.5 times the maximum grinding media diameter and is preferably set to about 0.9 times the maximum grinding media diameter. The number of lifting bars depends on the clear diameter of the milling drum, but is at least 4. The distance between the lifting bars evenly distributed on the circumference of the milling drum should not exceed 0.3 m and not less than 0.1 m. A distance of between 0.15 and 0.2 m is advantageous.

Der dem Aufgabetrichter 14 nachgeschaltete Verteiler 15 ist so gelagert, daß seine Drehzahl von der Drehfrequenz der Mahlrohre unabhängig einstellbar ist und mit einer 2,5- bis 4-fachen Drehfrequenz, bezogen auf die Mahl­rohrbahn, betrieben wird. Auf diese Weise werden Stau­ungen des Mahlgutes mit Sicherheit vermieden.The distributor 15 downstream of the feed hopper 14 is mounted in such a way that its speed can be set independently of the rotational frequency of the grinding tubes and is operated at a 2.5- to 4-fold rotational frequency, based on the grinding tube path. In this way, congestion of the ground material can be avoided with certainty.

VersuchsberichtTest report

Im halbtechnischen Maßstab wurde eine Planetenmühle eingesetzt, die wie das Ausführungsbeispiel nach Fig. 2 aufgebaut war. Der lichte Durchmesser der Mahl­rohre betrug 120 mm, die wirksame Mahlrohrlänge 210 mm. Die Neigung der Hauptdrehachse war auf 18° eingestellt. Bei dem Zerkleinern wurde Kalkstein mit einer Korngröße von 1 bis 3,15 mm als Mahlgut in einer Produktrate von 25 kg/g aufgegeben. Die Umlaufzahl, das ist das Verhältnis des Massenstroms des Mühlenaustrags zu dem des Mahlprodukts betrug 2,5. Daraus ergab sich eine Fliehkrafthöhe von 13 g. Die gattierten kugelförmigen Mahlkörper hatten einen mittleren Durchmesser von 7,2 mm und bestanden aus Stahl. Der Füllungsgrad der Mahl­körper in den Mahlrohren betrug 0,4. Der Planetenmühle war ein Kanalradsichter entsprechend dem Fließbild nach Fig. 1 vorgeschaltet. Das aus dem Kanalsichter ausge­schiedene Mahlprodukt wies bei 100 % des Austrags eine Feinheit < 24 µm auf. Der spezifische Energie­bedarf für die Mahlung lag unter 50 kWh/t des erzeugten Mahlprodukts.A planetary mill was used on a semi-industrial scale, which was constructed like the exemplary embodiment according to FIG. 2. The inside diameter of the grinding tubes was 120 mm, the effective length of the grinding tubes was 210 mm. The inclination of the main axis of rotation was set to 18 °. During the crushing process, limestone with a grain size of 1 to 3.15 mm was used as a regrind in a product rate of 25 kg / g. The number of cycles, that is the ratio of the mass flow of the mill discharge to that of the ground product was 2.5. This resulted in a centrifugal force of 13 g. The spherical grinding media had an average diameter of 7.2 mm and were made of steel. The degree of filling of the grinding media in the grinding tubes was 0.4. The planetary mill was preceded by a channel wheel classifier according to the flow diagram according to FIG. 1. The ground product separated from the sewer sifter had a fineness of <24 µm at 100% of the discharge. The specific energy requirement for the grinding was below 50 kWh / t of the grinding product produced.

In derselben Anlage wurde Zementklinder zu Feinstzement verarbeitet. Dabei wurde die Neigung der Mahlrohrachsen auf 15° eingestellt. Die Produktrate betrug 4 kg/h bei einer Aufgabekorngröße < 3 mm. Die Umlaufzahl be­trug 4 und der Mahlkörperfüllungsgrad wieder 0,4. Die sich ergebende Fliehkrafthöhe lag bei 3 g. Bei einem spezifischen Energiebedarf von 42 kWh/t ergab sich eine Feinheit des Mahlprodukts von 5000 cm²/g nach Blaine.In the same plant, cement binder was processed into fine cement. The inclination of the grinding tube axes was set to 15 °. The product rate was 4 kg / h with a feed grain size <3 mm. The number of cycles was 4 and the degree of filling of the grinding media was again 0.4. The resulting centrifugal force was 3 g. With a specific energy requirement of 42 kWh / t, the fineness of the ground product was 5000 cm² / g according to Blaine.

In der Anlage wurde ferner Bauxit mit einer Korngröße < 3,15 mm bei einer Mahlrohrachsen-Neigung von 15° mit einer Produktrate von 14 kg/h und bei einem Mahl­körperfüllunggrad von 0,4 mit Stahlkugeln von 10 mm Durchmesser aufgegeben. Die Umlaufzahl betrug 2,5, die Fliehkrafthöhe 13 g. Die erzielte Feinheit des Mahl­produktes lag bei einem spezifischen Energiebedarf von 90 kWh/t 81 % des Mahlproduktes < 12 µm.In the plant, bauxite with a grain size of <3.15 mm and a grinding tube axis inclination of 15 ° with a product rate of 14 kg / h and a grinding media filling degree of 0.4 with steel balls of 10 mm diameter was also added. The number of rotations was 2.5 and the centrifugal force was 13 g. The fineness of the ground product was achieved with a specific energy requirement of 90 kWh / t 81% of the ground product <12 µm.

Claims (12)

1. Verfahren zur Feinstzerkleinerung von mineralischen Stoffen, insbesondere mineralischen Rohstoffen, im trockenen Zustand, unter Verwendung einer Planeten­mühle, deren mindestens zwei jeweils mit sich in axialer Richtung erstreckenden Hubleisten versehene Mahlrohre gegenüber ihrer Umlaufbahn jeweils einen 1,5 bis 4-fach kleineren Durchmesser aufweisen und mit einer solchen Umlauffrequenz betrieben werden, daß die auftretenden Fliehkräfte zwischen 2,5 und 15 g betragen, dadurch gekennzeich­net, das die Achsen der Mahlrohre der Planetenmühle bis zu 30° zur Horizontalen geneigt angeordnet werden und das Verhältnis der Umlauffrequenz Mahlrohrbahn/­Mahlrohr 0,4 bis 0,8 eingestellt wird.1. A process for the very fine comminution of mineral substances, in particular mineral raw materials, in the dry state, using a planetary mill, the at least two grinding tubes of which each have axially extending lifting strips have a diameter 1.5 to 4 times smaller than their orbit and be operated with such a rotation frequency that the centrifugal forces occurring are between 2.5 and 15 g, characterized in that the axes of the grinding tubes of the planetary mill are inclined up to 30 ° to the horizontal and the ratio of the circulation frequency grinding tube track / grinding tube 0, 4 to 0.8 is set. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß die Achsen der Mahlrohre zwischen 5 und 20° zur Horizontalen geneigt angeordnet werden.2. The method according to claim 1, characterized in that the axes of the grinding tubes are arranged between 5 and 20 ° inclined to the horizontal. 3. Verfahren nach Anspruch 1 oder 2, dadurch gekenn­zeichnet, daß das Verhältnis der Umlauffrequenz Mahl­rohrbhan/Mahlrohr 0,45 bis 0,65 eingestellt wird.3. The method according to claim 1 or 2, characterized in that the ratio of the rotational frequency Mahlrohrbhan / Mahlrohr 0.45 to 0.65 is set. 4. Verfahren nach Anspruch 1, 2 oder 3, dadurch gekenn­zeichnet, daß die Mahlrohre mit einem Luftstrom in Austragsrichtung von 0,2 bis 1 m/s, vorzugsweise 0,4 bis 0,6 m/s beaufschlagt werden.4. The method according to claim 1, 2 or 3, characterized in that the grinding tubes with an air flow in the discharge direction of 0.2 to 1 m / s, preferably 0.4 to 0.6 m / s are applied. 5. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß der Werkstoff der Mahl­rohrwand so auf das eingesetzte Mahlgut abge­stimmt wird, daß der Haftreibungsbeiwert verringert wird.5. The method according to any one of the preceding claims, characterized in that the material of the grinding tube wall is matched to the grinding material used so that the coefficient of static friction is reduced. 6. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß zumindest teilweise geeignete Mahlkörper der gleichen Art wie das Mahl­gut eingesetzt werden.6. The method according to any one of the preceding claims, characterized in that at least partially suitable grinding media of the same type as the regrind are used. 7. Verfahren nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, daß das in einem nachge­schalteten Sichter abgeschiedene Grobgut im Kreis­lauf in die Planetenmühle zurückgeführt wird.7. The method according to any one of the preceding claims, characterized in that the coarse material separated in a downstream classifier is recycled into the planetary mill. 8. Verfahren nach Anspruch 7, dadurch gekennzeichnet, daß ein trennscharfer Sichter, der Trenngrenzen im Bereich <40 µm aufweist, eingesetzt wird.8. The method according to claim 7, characterized in that a sharp separator having separation limits in the range <40 microns is used. 9. Verfahren nach Anspruch 8, dadurch gekennzeichnet, daß als Sichter ein Kanalradsichter eingesetzt wird.9. The method according to claim 8, characterized in that a channel wheel classifier is used as classifier. 10. Vorrichtung zur Durchführung des Verfahrens nach einem der Ansprüche 1 bis 9, dadurch gekennzeich­net, daß die Mahlrohre 1,5 bis 2 mal so lang wie ihre Durchmesser sind.10. Device for performing the method according to one of claims 1 to 9, characterized in that the grinding tubes are 1.5 to 2 times as long as their diameter. 11. Vorrichtung zur Durchführung des Verfahrens nach An­spruch 10, dadurch gekennzeichnet, daß die Planeten­mühle mit Bezug auf ihre Drehachse neigungsverstellbar angeordnet ist.11. The device for performing the method according to claim 10, characterized in that the planetary mill is arranged with respect to its axis of inclination adjustable. 12. Vorrichtung nach Anspruch 11, dadurch gekennzeichnet, daß die im Austrags- und Eintragsbereich jeweils gelagerte Planetenmühle im Eintragsbereich mindestens eine zwischen dem Lager und der Bodenabstützung beid­endig angelenkte Längenverstelleinrichtung aufweist.12. The apparatus according to claim 11, characterized in that the planetary mill mounted in the discharge and entry area in the entry area has at least one length-adjustable device articulated at both ends between the bearing and the floor support.
EP86113849A 1985-11-02 1986-10-07 Method of finely grinding mineral material and device for carrying out the method Withdrawn EP0221377A3 (en)

Applications Claiming Priority (2)

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DE19853538991 DE3538991A1 (en) 1985-11-02 1985-11-02 METHOD FOR MINIMIZING MINERAL SUBSTANCES AND DEVICE FOR IMPLEMENTING THE METHOD
DE3538991 1985-11-02

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EP0221377A3 EP0221377A3 (en) 1988-08-03

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WO1990008596A1 (en) * 1989-01-31 1990-08-09 Institut Khimii Tverdogo Tela I Pererabotki Mineralnogo Syrya Sibirskogo Otdelenia Akademii Nauk Sssr Discrete-action planetary mill
EP0487833A2 (en) * 1990-11-27 1992-06-03 Kurimoto, Ltd. Continuous air-swept type planetary ball mill
EP0508109A2 (en) * 1991-03-12 1992-10-14 Linde Aktiengesellschaft Method for screening a fine-grained material
GB2257379A (en) * 1991-07-09 1993-01-13 Ecc Int Ltd Comminution in a planetary mill.
CN100478077C (en) * 2007-05-31 2009-04-15 中国铝业股份有限公司 Mine milling method for improving particles size distribution of bauxite mine milling products
CN103285977A (en) * 2013-06-13 2013-09-11 鞍钢集团矿业公司 Desliming process before grinding
CN109012892A (en) * 2018-10-12 2018-12-18 河南先导机械力化学研究院有限公司 A kind of discharging device and discharge control method for planetary ball mill
CN109092453A (en) * 2018-10-12 2018-12-28 河南先导机械力化学研究院有限公司 Ball milling control device and control method for planetary ball mill
CN111298952A (en) * 2020-03-31 2020-06-19 唐山贺祥机电股份有限公司 Control method for time-interval variable-speed variable-frequency automatic operation of ball mill

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Publication number Priority date Publication date Assignee Title
CN110586258B (en) * 2019-08-24 2021-06-15 武汉宇格电力设备有限公司 Planetary ball mill for industrial use

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GB191321079A (en) * 1913-09-18 1914-09-03 Boulton Ltd William Improved Cylinder or Ball Mill for use in Grinding Potters' Materials and the like.
US1772737A (en) * 1928-05-28 1930-08-12 Austice A Wise Ball mill
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Cited By (15)

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Publication number Priority date Publication date Assignee Title
WO1990008596A1 (en) * 1989-01-31 1990-08-09 Institut Khimii Tverdogo Tela I Pererabotki Mineralnogo Syrya Sibirskogo Otdelenia Akademii Nauk Sssr Discrete-action planetary mill
EP0487833A2 (en) * 1990-11-27 1992-06-03 Kurimoto, Ltd. Continuous air-swept type planetary ball mill
EP0487833A3 (en) * 1990-11-27 1992-07-22 Kurimoto, Ltd. Continuous air-swept type planetary ball mill
EP0508109A3 (en) * 1991-03-12 1993-03-24 Linde Aktiengesellschaft Method for screening a fine-grained material
EP0508109A2 (en) * 1991-03-12 1992-10-14 Linde Aktiengesellschaft Method for screening a fine-grained material
US5364036A (en) * 1991-07-09 1994-11-15 Ecc International Limited Comminution in a planetary mill
GB2257379A (en) * 1991-07-09 1993-01-13 Ecc Int Ltd Comminution in a planetary mill.
GB2257379B (en) * 1991-07-09 1995-04-19 Ecc Int Ltd Comminution in a planetary mill
US5513806A (en) * 1991-07-09 1996-05-07 Ecc International Limited Autogenous comminution in a planetary mill
CN100478077C (en) * 2007-05-31 2009-04-15 中国铝业股份有限公司 Mine milling method for improving particles size distribution of bauxite mine milling products
CN103285977A (en) * 2013-06-13 2013-09-11 鞍钢集团矿业公司 Desliming process before grinding
CN109012892A (en) * 2018-10-12 2018-12-18 河南先导机械力化学研究院有限公司 A kind of discharging device and discharge control method for planetary ball mill
CN109092453A (en) * 2018-10-12 2018-12-28 河南先导机械力化学研究院有限公司 Ball milling control device and control method for planetary ball mill
CN109092453B (en) * 2018-10-12 2021-03-09 河南先导机械力化学研究院有限公司 Ball milling control device and control method for planetary ball mill
CN111298952A (en) * 2020-03-31 2020-06-19 唐山贺祥机电股份有限公司 Control method for time-interval variable-speed variable-frequency automatic operation of ball mill

Also Published As

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DK505086A (en) 1987-05-03
DK505086D0 (en) 1986-10-21
DE3538991A1 (en) 1987-05-21
EP0221377A3 (en) 1988-08-03
ES2003418A6 (en) 1988-11-01
ZA868259B (en) 1987-07-29

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