EP0447669B1 - Process and plant for two-stage grinding of brittle materials - Google Patents

Process and plant for two-stage grinding of brittle materials Download PDF

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Publication number
EP0447669B1
EP0447669B1 EP90125239A EP90125239A EP0447669B1 EP 0447669 B1 EP0447669 B1 EP 0447669B1 EP 90125239 A EP90125239 A EP 90125239A EP 90125239 A EP90125239 A EP 90125239A EP 0447669 B1 EP0447669 B1 EP 0447669B1
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Prior art keywords
mill
grinding
grinding stage
separator
stage
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EP90125239A
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German (de)
French (fr)
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EP0447669A1 (en
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Gotthardt Dipl.-Ing. Blasczyk
Norbert Dipl.-Ing. Patzelt
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ThyssenKrupp Industrial Solutions AG
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Krupp Polysius 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
    • B02C21/00—Disintegrating plant with or without drying of the material
    • B02C21/002—Disintegrating plant with or without drying of the material using a combination of a roller mill and a drum mill
    • B02C21/005—Disintegrating plant with or without drying of the material using a combination of a roller mill and a drum mill the roller mill having cooperating rollers
    • 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
    • B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
    • B02C23/10—Separating or sorting of material, associated with crushing or disintegrating with separator arranged in discharge path of crushing or disintegrating zone
    • B02C23/12—Separating or sorting of material, associated with crushing or disintegrating with separator arranged in discharge path of crushing or disintegrating zone with return of oversize material to crushing or disintegrating zone

Definitions

  • the invention relates to a method for the two-stage comminution of brittle regrind (according to the preamble of claim 1) and a grinding plant for the two-stage comminution of brittle regrind (according to the preamble of claim 8), in particular cement materials to be crushed as brittle regrind.
  • DE-A-26 51 548 proposes a method and a grinding plant with a single mill, the fresh material and recycled semolina from at least one sifter downstream of the mill is fed in together, a circulation quantity control consisting essentially of two control loops for fresh material quantity regulation and one Semolina regulation is provided.
  • a circulation quantity control consisting essentially of two control loops for fresh material quantity regulation and one Semolina regulation is provided.
  • BE-A-566 774 shows a grinding process and a grinding plant suitable for carrying it out.
  • This grinding plant contains a first grinding stage with a pre-mill (first mill).
  • This pre-mill is followed by a container for receiving the pre-shredded material, from which a pre-sifter can be fed in a controllable manner, withdrawn from the fine material as finished product and that Whole coarse material is forwarded to a fine mill (multi-chamber compound mill) and at least one chamber of this fine mill is fed.
  • the finely comminuted ground material is conveyed to a second classifier belonging to this second grinding stage, from which the fine material is in turn drawn off as finished material, while the coarse material is fed from this second classifier to an intermediate container, via the level indicator of which the quantity feed from the preliminary container to first sifter is controllable and from which the two chambers of the fine mill can be fed with material via distribution devices.
  • the regulation for the throughput is carried out in such a way that when the throughput in the second grinding stage operating as a recirculating grinding system changes, for example due to a changed quantity of finished goods, there is no control intervention in the control device of this second grinding stage, while the respective throughput quantity change occurs second grinding stage is transferred via the metering belt scale assigned to the roller mill (first grinding stage) in the sense of a change in the speed of the rollers of this roller mill, by one of the second grinding stage coming control signal first for an adapted control intervention of the weigh feeder and accordingly, a further control signal is then processed for a corresponding adaptation of the speed control of the rolls of this roll mill.
  • the invention has for its object to improve a method in the preamble of claim 1 and a grinding plant of the type required in the preamble of claim 8 in such a way that with a particularly sensitive adjustment of the material to be fed to the second mill of the second grinding stage, a relatively high Throughput capacity of this mill is achieved and a relatively simple and reliable adaptability of the throughput capacity of the first grinding stage to that of the second grinding stage is ensured.
  • the first grinding stage with the first mill and an associated air classifier is first of all designed in the form of a circulation grinding system. Since this means that the comminuted material coming from the first mill is first classified in the associated first wind sifter in coarse material (semolina), which is returned to the first mill as a return quantity, and in fine material that is classified as fresh material in the second mill of the second grinding stage (second fresh quantity) supplied, can be kept away from this second mill, which serves for the fine comminution of the material, too coarse regrind so that this second mill can be fed with a relatively narrow grain size distribution in the feed material, which in turn leads to a more uniform fine comminution in this second mill and one higher throughput in this second grinding stage.
  • coarse material coarse material
  • second fresh quantity fine material that is classified as fresh material in the second mill of the second grinding stage supplied
  • the total supply of ground material is kept constant in the two grinding stages by assigned control devices.
  • the fine material of the air classifier of the first grinding stage forms the proportion of fresh material for the second mill of the second grinding stage, with changing the quantity of finished product of this second grinding stage then a constant regulation of the quantity of ground material feed to the second mill can take place in that the air classifier the first grinding stage in the sense of a quantity of fresh material or quantity of feed material required in the second mill.
  • this can be done in a simple, rapid and reliable manner in that the air classifier of the first grinding system has a visual fineness adjustment device with a drive which is infinitely variable in its speed.
  • the first grinding stage and the second grinding stage operate in the manner of a circulation grinding system, each with a mill and a classifier in accordance with the characterizing part of claim 2.
  • a spreader or basket air classifier is particularly advantageous.
  • a basket air classifier is used as the air classifier for each grinding stage, in which a comparatively simple, rapid setting of the visual fineness for the fine material portion can be achieved by means of a stepless adjustability of the drive for the rotating basket within the classifying space.
  • the embodiments of the grinding system described below with reference to the drawing are used in particular for the two-stage comminution of brittle ground material, in particular of cement materials, such as cement clinker, slag and the like.
  • the entire grinding plant contains, as essential plant parts, a first grinding stage designed for the preliminary comminution of regrind in the form of a recirculating grinding system, with a first mill 1 and a first air classifier 2, as well as a downstream of the first grinding stage, intended for the fine comminution of regrind, second grinding stage, likewise in the form of a circulation grinding system, with a second mill 3 and a second air classifier 4;
  • a plurality of storage bunkers 5, 6, 7 can be provided for different regrind components, with metering belt scales 5a, 6a, 7a or other metering devices being arranged under each storage bunker 5, 6, 7 in a manner known per se, which feeders 8 can be controlled in terms of their conveying capacity , for example a conveyor belt, work for fresh material to the first mill 1.
  • the wind sifters used in the first grinding stage and in the second grinding stage can be designed in any suitable, known embodiment which offers a setting option for the visual fineness, ie for the fineness of the fine material quantity, it is preferred, at least the wind sifter 2 to form the first grinding stage as a centrifugal air classifier, in particular as a basket air classifier in a known embodiment.
  • the first air classifier 2 of the first grinding stage and the second are particularly preferred Air classifier 4 of the second grinding stage is designed as a basket air classifier of the same type.
  • each wind classifier 2, 4 has, in a manner known per se, a rotating basket 2a or 4a, which is only indicated by dashed lines, in the region of the inner visual space.
  • This viewing basket 2a or 4a essentially forms a viewing fineness adjustment device which can be adjusted in its speed via a drive motor 9 or 10 which is infinitely variable in its speed and thus in the respectively desired viewing fineness of the classifier.
  • the first air classifier 2 in the first grinding stage has a coarse material or semolina outlet 2b and at least one fine material outlet 2c, preferably a plurality of such fine material outlets 2c. These fine material outlets feed a connecting conveyor 11 of a connecting device, which conveys the fine material coming from this first sifter 2 as a quantity of fresh material (arrow 12) to the good inlet 3a of the second mill 3.
  • the amount of coarse material flowing out of this first air classifier 2 (semolina quantity) is - according to arrow 13 - initially recorded in terms of quantity as the first quantity of returned material by a quantity measuring device, for example a belt scale 14, and then fed to a grinding material feed shaft 15 directly above the feed point of the first mill 1.
  • the filling capacity of this regrind feed shaft 15 can be controlled with regard to the total feed quantity of this first mill 1 via suitable fill level monitoring devices, for which purpose in the present case pressure load cells 16 are provided, on which the regrind feed shaft 15 is supported in a manner known per se.
  • This regrind feed chute 15 is further - according to arrow 17 - fed through the feed device 8 in a controllable or metered manner as the first fresh material quantity via the feed device 8.
  • the material pre-comminuted in the first mill 1 of the first grinding stage (arrow 18) is preferably fed to the first air classifier 2 with the aid of a lifting device, for example an elevator 19.
  • the second mill 3 designed for the fine comminution also gives the finely comminuted material - according to the arrows 20 - to the second air classifier 4 of this second grinding stage via a lifting conveyor, preferably an elevator 21. While the fine material flowing out of the fine material outlets 4c of this second air classifier 4 according to arrows 22 is discharged as finished product from the grinding system, the amount of coarse material flowing out of the coarse material outlet (semolina outlet) 4b of this second air classifier 4 becomes a second return material quantity - according to arrows 23 - for the material inlet 3a of the second mill 3 returned.
  • a suitable quantity measuring device which in the present example is a suitable balance 24 can.
  • the second grinding stage is now associated with a known electrical or electronic control device in such a way that the total feed quantity that can be fed to the second mill 3, ie the sum of the quantity of fresh material (Arrow 12) and the second quantity of return goods (arrow 23) can be regulated constantly, for which purpose the second quantity of fresh goods (arrow 12) conveyed by the first classifier 2 via the connection conveyor 11 as a function of changes in the quantity of returned goods and finished goods (arrows 22 and 23) from the second classifier 4 is regulated.
  • this first control device of the second grinding stage is connected to the drive motor 9, which is variable in its speed, of the viewing basket 2a which determines the visual fineness, by a first controller (F GK ) 25 such that in the case of the changes mentioned in the quantities of finished goods and returned goods (22, 23) of the second grinding stage, the fine material quantity (arrow 12) from the first classifier 2 can be changed via its basket speed in the sense of a constant control of the total quantity of feed material of this second mill 3.
  • a second control device which also works electrically or electronically, is assigned to the first grinding stage in a design known per se.
  • the assignment and design of this second control device is such that when the first fine material quantity (12) and the first return material quantity (13) of the associated first air classifier 2 change, the first fresh material quantity (17) is fed via its feed device 8 in the sense of constant control of the first mill 1 total amount of feed is changeable.
  • this second control device contains, in addition to the usual setting and control devices, a number of controllers, one of which is a controller F GP for quantity measurement signals from the belt weigher 14 (for detecting the first quantity of returned goods 13), a controller F F for detecting the quantity signals from the controller F GP and the Quantity or weight signals from the bunker dosing scales 5a, 6a, 7a and another controller L for the detection of the total quantity of feed material in the grinding material feed shaft 15 is provided by the pressure load cells 16.
  • the associated connections are indicated by dashed lines.
  • the first mill 1 for pre-comminution in the first grinding stage and the second mill 3 for fine comminution in the second grinding stage can be provided per se in any suitable embodiment.
  • the first mill 1 is formed by a roller mill known per se with two rollers 1a, 1b, at least one roller of which can be driven in a manner known per se is and between them form a grinding gap 1c for a material bed size reduction of the material to be fed.
  • the second grinding stage it is preferred to provide a drum or tube mill as the second mill 3, in which the material to be ground is finely comminuted under the action of grinding media, and an embodiment known per se as a ball mill is particularly preferred.
  • the amount of fines (arrow 12) to be fed to this second mill 3 as a fresh material quantity must be reduced accordingly (by a corresponding change in the speed of the viewing basket 2a), so that the second total feed quantity to the second one via the first control device Mill 3 can be regulated constantly.
  • FIG. 2 A second exemplary embodiment or an embodiment variant of the grinding plant described above with reference to FIG. 1 is explained with the aid of the partial flow diagram according to FIG. 2, for which purpose only the parts of the plant required for this, and in particular the connection area, especially from the first grinding step to the second grinding step, are illustrated and be explained.
  • Plant parts executed in the first example are designated by the same reference numerals as in the first example (FIG. 1), so that these plant parts do not have to be explained again individually.
  • this connecting device for the supply of the fine material coming from the first sifter 2 of the first grinding stage is mainly formed by a connecting conveyor
  • this connecting device in this second exemplary embodiment contains ( Fig. 2) in addition to the connection conveyor 11 '(as a fine material conveyor) still an intermediate silo 30, which is arranged between the connection conveyor 11' and the material inlet 3a of the second mill 3 of the fine grinding stage and is controllable in its intermediate storage quantity.
  • the intermediate silo 30 can be equipped with fill level control devices known per se or, as is preferred in this example, can be arranged on pressure measuring cells 31 in order to be able to control the intermediate storage quantities in a suitable manner.
  • the outlet 30a of this intermediate silo 30 is assigned an outlet metering device 32 in a design known per se. Only from this outlet dosing element 32 is the fine material coming from the first classifier 2 (arrow 12) as a second quantity of fresh material and with variable control (metering) fed to the product inlet 3a of the second mill 3, together with that from the second classifier 4 second amount of returned material returned in the second grinding stage (arrows 23); if necessary, a further lifting lever can be arranged between the outlet dosing element 32 and the material inlet 3a of the second mill 3, as is indicated by dash-dotted lines at 33.
  • the first control device for the second grinding stage is then modified in such a way that a first controller (L) 34 in the control connection (only indicated by dashed lines) between the pressure transducers 31 of the intermediate silo 30 and the speed which can be changed Drive motor 9 for the sight basket 2a of the first air classifier 2 and a second controller (R) 35 of this first regulating device is arranged in a control connection - likewise indicated only by dashed lines - between the return material quantity measuring device designed as a scale 24 and the outlet metering element 32.
  • a first controller (L) 34 in the control connection (only indicated by dashed lines) between the pressure transducers 31 of the intermediate silo 30 and the speed which can be changed Drive motor 9 for the sight basket 2a of the first air classifier 2
  • a second controller (R) 35 of this first regulating device is arranged in a control connection - likewise indicated only by dashed lines - between the return material quantity measuring device designed as a scale 24 and the outlet metering element 32.
  • the fine material quantity (arrows 12) to be fed from the first classifier (2) of the first grinding stage to the material inlet 3a of the second mill 2 can be extracted from the second classifier 4, that is, before the above-mentioned mill infeed 3a, initially temporarily stored and then called up in a controlled quantity adapted for constant control with the second return quantity (arrows 23) respectively brought in from the second sifter 4.
  • the total quantity of fresh material required for constant control of the total quantity of feed to the second mill 3 (quantity of fine material 12 from the first sifter 2) is regulated in that the viewing basket 2a is adjusted accordingly in terms of its speed and thus this first sifter 2 in its visual fineness becomes.
  • each grinding stage follows Type of a circulation grinding system, each with a mill and an associated wind sifter
  • this second mill is preferably designed as a tube mill, ball mill or the like, there is the possibility here of adjusting the air flow to be passed through this second mill so that the sufficiently finely comminuted material discharged from it with this mill can be removed as a finished product.
  • the fresh material brought in from the classifier of the first grinding stage to the second mill of the second grinding stage forms the total feed quantity of this second mill
  • the constant control then depending on the finely comminuted material discharged from this second mill as finished product quantity with the aid of the visual fineness setting device of the air classifier of the first grinding stage is constantly regulated.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Disintegrating Or Milling (AREA)
  • Crushing And Grinding (AREA)

Description

Die Erfindung betrifft ein Verfahren zur zweistufigen Zerkleinerung von sprödem Mahlgut (entsprechend dem Oberbegriff des Anspruches 1) sowie eine Mahlanlage zur zweistufigen Zerkleinerung von sprödem Mahlgut (gemäß dem Oberbegriff des Anspruches 8), wobei als sprödes Mahlgut insbesondere Zementmaterialien zerkleinert werden sollen.The invention relates to a method for the two-stage comminution of brittle regrind (according to the preamble of claim 1) and a grinding plant for the two-stage comminution of brittle regrind (according to the preamble of claim 8), in particular cement materials to be crushed as brittle regrind.

In der DE-A-26 51 548 werden ein Verfahren und eine Mahlanlage mit einer einzigen Mühle vorgeschlagen, der Frischgut und rückgeführte Grieße aus wenigstens einem der Mühle nachgeordneten Sichter gemeinsam aufgegeben wird, wobei eine Umlaufmengenregelung aus im wesentlichen zwei Regelkreisen für eine Frischgutmengenregelung und eine Grießmengenregelung vorgesehen ist. Hiernach kann bei einer Veränderung der Grießemenge die Trenngrenze des Sichters durch eine Änderung der Streutellerdrehzahl in diesem Sichter neu eingestellt werden, wodurch die Menge der rückgeführten Grieße relativ zur Frischgutmenge konstant gehalten werden kann und wodurch außerdem eine Verschiebung der Trenngrenze und damit eine Qualitätsveränderung des Fertiggutes (feiner oder gröber) herbeigeführt werden kann.DE-A-26 51 548 proposes a method and a grinding plant with a single mill, the fresh material and recycled semolina from at least one sifter downstream of the mill is fed in together, a circulation quantity control consisting essentially of two control loops for fresh material quantity regulation and one Semolina regulation is provided. After this, if the amount of semolina changes, the separating limit of the classifier can be readjusted by changing the spreading disc speed in this classifier, which means that the amount of returned semolina can be kept constant relative to the quantity of fresh material and also causes a shift in the separating limit and thus a change in the quality of the finished product ( finer or coarser) can be brought about.

Der BE-A-566 774 läßt sich ein Mahlverfahren und eine zu dessen Durchführung geeignete Mahlanlage entnehmen. Diese Mahlanlage enthält eine erste Mahlstufe mit einer Vormühle (erste Mühle). Dieser Vormühle ist zur Aufnahme des vorzerkleinerten Gutes ein Behälter nachgeordnet, aus dem regelbar ein Vorsichter gespeist werden kann, von dem Feingut als Fertiggut abgezogen und das ganze Grobgut zu einer Feinmühle (Mehrkammer-Verbundmühle) weitergeleitet und wenigstens einer Kammer dieser Feinmühle zugeführt wird. Aus den Mahlkammern dieser Feinmühle wird das feinzerkleinerte Mahlgut einem zu dieser zweiten Mahlstufe gehörenden zweiten Sichter zugefördert, aus dem das Feingut wiederum als Fertiggut abgezogen wird, während das Grobgut aus diesem zweiten Sichter einem Zwischenbehälter zugeführt wird, über dessen Niveauanzeiger die Mengenzuführung aus dem Vorbehälter zum ersten Sichter regelbar ist und aus dem die beiden Kammern der Feinmühle über Aufteileinrichtungen mit Gut gespeist werden können.BE-A-566 774 shows a grinding process and a grinding plant suitable for carrying it out. This grinding plant contains a first grinding stage with a pre-mill (first mill). This pre-mill is followed by a container for receiving the pre-shredded material, from which a pre-sifter can be fed in a controllable manner, withdrawn from the fine material as finished product and that Whole coarse material is forwarded to a fine mill (multi-chamber compound mill) and at least one chamber of this fine mill is fed. From the grinding chambers of this fine mill, the finely comminuted ground material is conveyed to a second classifier belonging to this second grinding stage, from which the fine material is in turn drawn off as finished material, while the coarse material is fed from this second classifier to an intermediate container, via the level indicator of which the quantity feed from the preliminary container to first sifter is controllable and from which the two chambers of the fine mill can be fed with material via distribution devices.

Aus der DE-A-34 07 535 sind ein Verfahren und eine Anlage gemäß den ersten Teilen der Ansprüche 1 und 8 bekannt, wonach für die Vorzerkleinerung in einer ersten Stufe als erste Mühle eine Gutbett-Walzenmühle mit zwei Walzen verwendet wird, wobei dieser Walzenmühle eine Dosierbandwaage als Zufördereinrichtung für Frischgut zugeordnet ist. Das in dieser Walzenmühle vorzerkleinerte Gut wird insgesamt der Mühle einer zweiten Mahlstufe zusammen mit der von einem Sichter dieser zweiten Mahlstufe kommenden Rückgutmenge (abgetrenntes Grobgut bzw. abgetrennte Grieße) zugeführt. Bei dieser bekannten Ausführung wird die Regelung für die Durchsatzleistung in der Weise vorgenommen, daß bei einer Änderung der Durchsatzmengen in der als Umlaufmahlsystem arbeitenden zweiten Mahlstufe, beispielsweise aufgrund einer geänderten Fertiggutmenge, ein Regeleingriff in die Regeleinrichtung dieser zweiten Mahlstufe unterbleibt, während die jeweilige Durchsatzmengenänderung der zweiten Mahlstufe über die der Walzenmühle (erste Mahlstufe) zugeordnete Dosierbandwaage im Sinne einer Drehzahländerung der Walzen dieser Walzenmühle übertragen wird, indem ein von der zweiten Mahlstufe kommendes Regelsignal zunächst für einen angepaßten Regeleingriff der Dosierbandwaage und dementsprechend dann ein weiteres Regelsignal für eine entsprechende Anpassung der Drehzahlregelung der Walzen dieser Walzenmühle verarbeitet wird.From DE-A-34 07 535 a method and a system according to the first parts of claims 1 and 8 are known, according to which a material bed roller mill with two rollers is used as the first mill for the pre-comminution in a first stage, this roller mill a dosing belt scale is assigned as a feed device for fresh goods. The material pre-comminuted in this roller mill is fed to the mill in a second grinding stage together with the return material quantity (separated coarse material or separated semolina) coming from a classifier of this second grinding stage. In this known embodiment, the regulation for the throughput is carried out in such a way that when the throughput in the second grinding stage operating as a recirculating grinding system changes, for example due to a changed quantity of finished goods, there is no control intervention in the control device of this second grinding stage, while the respective throughput quantity change occurs second grinding stage is transferred via the metering belt scale assigned to the roller mill (first grinding stage) in the sense of a change in the speed of the rollers of this roller mill, by one of the second grinding stage coming control signal first for an adapted control intervention of the weigh feeder and accordingly, a further control signal is then processed for a corresponding adaptation of the speed control of the rolls of this roll mill.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren der im Oberbegriff des Anspruches 1 sowie eine Mahlanlage der im Oberbegriff des Anspruches 8 vorausgesetzten Art in der Weise zu verbessern, daß bei einer besonders feinfühligen Anpassung des der zweiten Mühle der zweiten Mahlstufe zuzuführenden Mahlgutes eine relativ hohe Durchsatzmengenleistung dieser Mühle erreicht und dabei eine relativ einfache und zuverlässige Anpaßbarkeit der Durchsatzmengenleistung der ersten Mahlstufe an die der zweiten Mahlstufe gewährleistet ist.The invention has for its object to improve a method in the preamble of claim 1 and a grinding plant of the type required in the preamble of claim 8 in such a way that with a particularly sensitive adjustment of the material to be fed to the second mill of the second grinding stage, a relatively high Throughput capacity of this mill is achieved and a relatively simple and reliable adaptability of the throughput capacity of the first grinding stage to that of the second grinding stage is ensured.

Erfindungsgemäß wird dies einerseits durch die Kombination mit Verfahrensmerkmalen nach dem Kennzeichen des Anspruches 1 und andererseits mit einer Kombination von Anlagenmerkmalen gemäß dem Kennzeichen des Anspruches 8 erreicht.According to the invention, this is achieved on the one hand by the combination with method features according to the characterizing part of claim 1 and on the other hand with a combination of system features according to the characterizing part of claim 8.

Vorteilhafte Ausgestaltungen und Weiterbildungen der Erfindung ergeben sich aus den Unteransprüchen.Advantageous refinements and developments of the invention result from the subclaims.

Bei dieser erfindungsgemäßen Ausführung ist zunächst einmal die erste Mahlstufe mit der ersten Mühle und einem zugehörigen Windsichter in Form eines Umlaufmahlsystems ausgebildet. Da hierdurch das von der ersten Mühle kommende, vorzerkleinerte Gut zunächst im zugehörigen ersten Windsichter in Grobgut (Grieße), das als Rückgutmenge zur ersten Mühle zurückgeführt wird, und in Feingut klassiert wird, das der zweiten Mühle der zweiten Mahlstufe als Frischgutmenge (zweite Frischgutmenge) zugeführt wird, kann von dieser für die Feinzerkleinerung des Gutes dienenden zweiten Mühle noch zu grobes Mahlgut ferngehalten werden, so daß diese zweite Mühle mit einer relativ eng begrenzten Korngrößenverteilung im Aufgabegut beschickt werden kann, was wiederum zu einer gleichmäßigeren Feinzerkleinerung in dieser zweiten Mühle und einer höheren Durchsatzmengenleistung in dieser zweiten Mahlstufe führen kann.In this embodiment according to the invention, the first grinding stage with the first mill and an associated air classifier is first of all designed in the form of a circulation grinding system. Since this means that the comminuted material coming from the first mill is first classified in the associated first wind sifter in coarse material (semolina), which is returned to the first mill as a return quantity, and in fine material that is classified as fresh material in the second mill of the second grinding stage (second fresh quantity) supplied, can be kept away from this second mill, which serves for the fine comminution of the material, too coarse regrind so that this second mill can be fed with a relatively narrow grain size distribution in the feed material, which in turn leads to a more uniform fine comminution in this second mill and one higher throughput in this second grinding stage.

Erfindungsgemäß werden in den beiden Mahlstufen jeweils die Gesamtmahlgutzufuhr durch zugeordnete Regeleinrichtungen konstant gehalten. Hierbei bildet dann - wie erwähnt - das Feingut des Windsichters der ersten Mahlstufe den Frischgut-Mengenanteil für die zweite Mühle der zweiten Mahlstufe, wobei dann bei sich ändernder Fertiggutmenge dieser zweiten Mahlstufe eine Konstantregelung der Mahlgutzuführmenge zur zweiten Mühle dadurch erfolgen kann, daß der Windsichter der ersten Mahlstufe im Sinne einer in der zweiten Mühle erforderlichen Frischgutmenge bzw. Aufgabegutmenge beeinflußt wird. Dies kann erfindungsgemäß auf einfache, rasche und zuverlässige Weise dadurch geschehen, daß der Windsichter der ersten Mahlanlage eine Sichtfeinheits-Einstellvorrichtung mit einem in seiner Drehzahl stufenlos verstellbaren Antrieb aufweist.According to the invention, the total supply of ground material is kept constant in the two grinding stages by assigned control devices. Here, as mentioned, the fine material of the air classifier of the first grinding stage forms the proportion of fresh material for the second mill of the second grinding stage, with changing the quantity of finished product of this second grinding stage then a constant regulation of the quantity of ground material feed to the second mill can take place in that the air classifier the first grinding stage in the sense of a quantity of fresh material or quantity of feed material required in the second mill. According to the invention, this can be done in a simple, rapid and reliable manner in that the air classifier of the first grinding system has a visual fineness adjustment device with a drive which is infinitely variable in its speed.

In einer besonders bevorzugten Ausführungsform der Erfindung arbeiten die erste Mahlstufe und die zweite Mahlstufe nach Art eines Umlaufmahlsystems mit jeweils einer Mühle und einem Sichter entsprechend dem Kennzeichen des Anspruches 2.In a particularly preferred embodiment of the invention, the first grinding stage and the second grinding stage operate in the manner of a circulation grinding system, each with a mill and a classifier in accordance with the characterizing part of claim 2.

Bei der weiter oben genannten Ausführungsform des Windsichters mit Sichtfeinheits-Einstellvorrichtung ist die Verwendung eines Streuteller- oder Korbwindsichters besonders vorteilhaft. Mit besonderem Vorzug wird als Windsichter für jede Mahlstufe ein Korbwindsichter verwendet, bei dem sich durch eine stufenlose Einstellbarkeit des Antriebes für den rotierenden Korb innerhalb des Sichtraumes eine verhältnismäßig einfache, rasche Einstellung der Sichtfeinheit für den Feingutanteil erzielen läßt.In the embodiment of the wind sifter with the fineness adjustment device mentioned above, the Use of a spreader or basket air classifier is particularly advantageous. With particular preference, a basket air classifier is used as the air classifier for each grinding stage, in which a comparatively simple, rapid setting of the visual fineness for the fine material portion can be achieved by means of a stepless adjustability of the drive for the rotating basket within the classifying space.

Die Erfindung sei nachfolgend anhand der Zeichnung näher beschrieben. In dieser Zeichnung zeigen

Fig. 1
ein vereinfachtes Fließschema der ganzen Mahlanlage mit zwei als Umlaufmahlsysteme ausgebildeten Mahlstufen, gemäß einem ersten Ausführungsbeispiel;
Fig. 2
ein Teil-Fließschema eines zweiten Ausführungsbeispieles der Mahlanlage, wobei insbesondere der Übergangsbereich von der ersten Mahlstufe zur zweiten Mahlstufe veranschaulicht ist.
The invention is described below with reference to the drawing. Show in this drawing
Fig. 1
a simplified flow diagram of the entire grinding plant with two grinding stages designed as circulation grinding systems, according to a first embodiment;
Fig. 2
a partial flow diagram of a second embodiment of the grinding plant, in particular the transition area from the first grinding stage to the second grinding stage is illustrated.

Bei dem in Fig. 1 veranschaulichten ersten Ausführungsbeispiel der gesamten Mahlanlage sind aus Gründen der Übersichtlichkeit in der Hauptsache nur die Anlagenteile veranschaulicht, die zur Erläuterung dieser erfindungsgemäßen Ausführung erforderlich sind, während an sich bekannte Filtereinrichtungen, Antriebsmotoren, insbesondere für Förder- und Dosiereinrichtungen, Schaltungs- und Steuereinrichtungen usw. weitgehend weggelassen worden sind.In the first exemplary embodiment of the entire grinding plant illustrated in FIG. 1, for the sake of clarity, only the parts of the plant that are required to explain this embodiment according to the invention are illustrated, while filter devices, drive motors, in particular for conveying and metering devices, are known per se - and control devices etc. have been largely omitted.

Die anhand der Zeichnung nachfolgend beschriebenen Ausführungsformen der Mahlanlage dienen insbesondere zur zweistufigen Zerkleinerung von sprödem Mahlgut, insbesondere von Zementmaterialien, wie Zementklinker, Schlacke und dergleichen.The embodiments of the grinding system described below with reference to the drawing are used in particular for the two-stage comminution of brittle ground material, in particular of cement materials, such as cement clinker, slag and the like.

Gemäß Fließschema der Fig. 1 enthält die gesamte Mahlanlage als wesentliche Anlagenteile eine für die Vorzerkleinerung von Mahlgut in Form eines Umlaufmahlsystems ausgebildete erste Mahlstufe mit einer ersten Mühle 1 und einem ersten Windsichter 2 sowie eine der ersten Mahlstufe nachgeschaltete, für die Feinzerkleinerung von Mahlgut bestimmte, ebenfalls in Form eines Umlaufmahlsystems ausgebildete zweite Mahlstufe mit einer zweiten Mühle 3 und einem zweiten Windsichter 4; außerdem können mehrere Vorratsbunker 5, 6, 7 für verschiedene Mahlgutkomponenten vorgesehen sein, wobei unter jedem Vorratsbunker 5, 6, 7 in an sich bekannter Weise Dosierbandwaagen 5a, 6a, 7a oder andere Dosiereinrichtungen angeordnet sind, die auf eine in ihrer Förderleistung steuerbare Zufördereinrichtung 8, beispielsweise ein Förderband, für Frischgut zur ersten Mühle 1 arbeiten.According to the flow diagram of FIG. 1, the entire grinding plant contains, as essential plant parts, a first grinding stage designed for the preliminary comminution of regrind in the form of a recirculating grinding system, with a first mill 1 and a first air classifier 2, as well as a downstream of the first grinding stage, intended for the fine comminution of regrind, second grinding stage, likewise in the form of a circulation grinding system, with a second mill 3 and a second air classifier 4; In addition, a plurality of storage bunkers 5, 6, 7 can be provided for different regrind components, with metering belt scales 5a, 6a, 7a or other metering devices being arranged under each storage bunker 5, 6, 7 in a manner known per se, which feeders 8 can be controlled in terms of their conveying capacity , for example a conveyor belt, work for fresh material to the first mill 1.

Obwohl die in der ersten Mahlstufe und in der zweiten Mahlstufe verwendeten Windsichter in jeder geeigneten, an sich bekannten Ausführungsform ausgebildet sein können, die eine Einstellmöglichkeit für die Sichtfeinheit, d. h. für die Feinheit der Feingutmenge, bietet, wird es vorgezogen, zumindest den Windsichter 2 der ersten Mahlstufe als Fliehkraft-Windsichter, insbesondere als Korbwindsichter an sich bekannter Ausführungsform auszubilden. Mit besonderem Vorzug werden der erste Windsichter 2 der ersten Mahlstufe und der zweite Windsichter 4 der zweiten Mahlstufe als im Prinzip gleichartige Korbwindsichter ausgeführt. Hierbei besitzt jeder Windsichter 2, 4 in an sich bekannter Weise einen jeweils nur gestrichelt angedeuteten rotierenden Korb 2a bzw. 4a im Bereich des inneren Sichtraumes. Dieser Sichtkorb 2a bzw. 4a bildet im wesentlichen eine Sichtfeinheits-Verstellvorrichtung, die über einen in seiner Drehzahl stufenlos verstellbaren Antriebsmotor 9 bzw. 10 in seiner Drehzahl und somit in der jeweils gewünschten Sichtfeinheit des Sichters eingestellt werden kann.Although the wind sifters used in the first grinding stage and in the second grinding stage can be designed in any suitable, known embodiment which offers a setting option for the visual fineness, ie for the fineness of the fine material quantity, it is preferred, at least the wind sifter 2 to form the first grinding stage as a centrifugal air classifier, in particular as a basket air classifier in a known embodiment. The first air classifier 2 of the first grinding stage and the second are particularly preferred Air classifier 4 of the second grinding stage is designed as a basket air classifier of the same type. In this case, each wind classifier 2, 4 has, in a manner known per se, a rotating basket 2a or 4a, which is only indicated by dashed lines, in the region of the inner visual space. This viewing basket 2a or 4a essentially forms a viewing fineness adjustment device which can be adjusted in its speed via a drive motor 9 or 10 which is infinitely variable in its speed and thus in the respectively desired viewing fineness of the classifier.

Der erste Windsichter 2 in der ersten Mahlstufe besitzt einen Grobgut- bzw. Grießeauslauf 2b sowie wenigstens einen Feingutauslauf 2c, vorzugsweise mehrere solcher Feingutausläufe 2c. Diese Feingutausläufe speisen einen Verbindungsförderer 11 einer Verbindungseinrichtung, die das aus diesem ersten Sichter 2 kommende Feingut als Frischgutmenge (Pfeil 12) dem Guteinlauf 3a der zweiten Mühle 3 zufördert. Die von diesem ersten Windsichter 2 auslaufende Grobgutmenge (Grießemenge) wird - gemäß Pfeil 13 - als erste Rückgutmenge zunächst mengenmäßig von einer beispielsweise als Bandwaage 14 ausgebildeten Mengenmeßeinrichtung erfaßt und dann einem Mahlgut-Aufgabeschacht 15 unmittelbar über der Aufgabestelle der ersten Mühle 1 zugeführt. Dieser Mahlgutaufgabeschacht 15 kann in seiner Füllung hinsichtlich der Gesamtaufgabegutmenge dieser ersten Mühle 1 über geeignete Füllstandsüberwachungseinrichtungen gesteuert werden, wozu im vorliegenden Falle beispielsweise Druckmeßdosen 16 vorgesehen sind, auf denen der Mahlgutaufgabeschacht 15 in an sich bekannter Weise abgestützt ist.The first air classifier 2 in the first grinding stage has a coarse material or semolina outlet 2b and at least one fine material outlet 2c, preferably a plurality of such fine material outlets 2c. These fine material outlets feed a connecting conveyor 11 of a connecting device, which conveys the fine material coming from this first sifter 2 as a quantity of fresh material (arrow 12) to the good inlet 3a of the second mill 3. The amount of coarse material flowing out of this first air classifier 2 (semolina quantity) is - according to arrow 13 - initially recorded in terms of quantity as the first quantity of returned material by a quantity measuring device, for example a belt scale 14, and then fed to a grinding material feed shaft 15 directly above the feed point of the first mill 1. The filling capacity of this regrind feed shaft 15 can be controlled with regard to the total feed quantity of this first mill 1 via suitable fill level monitoring devices, for which purpose in the present case pressure load cells 16 are provided, on which the regrind feed shaft 15 is supported in a manner known per se.

Diesem Mahlgutaufgabeschacht 15 wird ferner - gemäß Pfeil 17 - über die Zufördereinrichtung 8 frisches Rohgut in steuerbarer bzw. dosierbarer Weise als erste Frischgutmenge zugeführt.This regrind feed chute 15 is further - according to arrow 17 - fed through the feed device 8 in a controllable or metered manner as the first fresh material quantity via the feed device 8.

Das in der ersten Mühle 1 der ersten Mahlstufe vorzerkleinerte Gut (Pfeil 18) wird mit Hilfe einer Überhebeeinrichtung, beispielsweise eines Elevators 19, vorzugsweise insgesamt dem ersten Windsichter 2 aufgegeben.The material pre-comminuted in the first mill 1 of the first grinding stage (arrow 18) is preferably fed to the first air classifier 2 with the aid of a lifting device, for example an elevator 19.

Die für die Feinzerkleinerung ausgebildete zweite Mühle 3 gibt das in ihr fein zerkleinerte Gut - entsprechend den Pfeilen 20 - ebenfalls über eine Überhebefördereinrichtung, vorzugsweise einen Elevator 21, dem zweiten Windsichter 4 dieser zweiten Mahlstufe auf. Während das aus den Feingutausläufen 4c dieses zweiten Windsichters 4 gemäß den Pfeilen 22 ablaufende Feingut als Fertiggut aus der Mahlanlage abgeführt wird, wird die aus dem Grobgutauslauf (Grießeauslauf) 4b dieses zweiten Windsichters 4 auslaufende Grobgutmenge als zweite Rückgutmenge - gemäß den Pfeilen 23 - zum Guteinlauf 3a der zweiten Mühle 3 zurückgeführt. Um diese zweite Rückgutmenge (Pfeile 23) mengenmäßig genau erfassen zu können, wird sie zwischen dem Sichter-Grobgutauslauf 4b und dem Guteinlauf 3a der zweiten Mühle 3 über eine geeignete Mengenmeßeinrichtung geführt, bei der es sich im vorliegenden Beispiel etwa um eine geeignete Waage 24 handeln kann.The second mill 3 designed for the fine comminution also gives the finely comminuted material - according to the arrows 20 - to the second air classifier 4 of this second grinding stage via a lifting conveyor, preferably an elevator 21. While the fine material flowing out of the fine material outlets 4c of this second air classifier 4 according to arrows 22 is discharged as finished product from the grinding system, the amount of coarse material flowing out of the coarse material outlet (semolina outlet) 4b of this second air classifier 4 becomes a second return material quantity - according to arrows 23 - for the material inlet 3a of the second mill 3 returned. In order to be able to precisely measure this second amount of returned goods (arrows 23), it is guided between the classifier coarse material outlet 4b and the material inlet 3a of the second mill 3 via a suitable quantity measuring device, which in the present example is a suitable balance 24 can.

Der zweiten Mahlstufe ist nun eine an sich bekannte elektrische oder elektronische Regeleinrichtung in der Weise zugeordnet, daß die der zweiten Mühle 3 zuführbare Gesamtaufgabemenge, d. h. die Summe aus Frischgutmenge (Pfeil 12) und zweiter Rückgutmenge (Pfeil 23) konstantregelbar ist, wozu die vom ersten Sichter 2 über den Verbindungsförderer 11 herangeförderte zweite Frischgutmenge (Pfeil 12) in Abhängigkeit von Änderungen der Rückgut- und Fertiggutmengen (Pfeile 22 und 23) aus dem zweiten Sichter 4 geregelt wird. Zu diesem Zweck ist diese erste Regeleinrichtung der zweiten Mahlstufe mit dem in seiner Drehzahl variablen Antriebsmotor 9 des die Sichtfeinheit bestimmenden Sichtkorbes 2a durch einen ersten Regler (FGK) 25 derart verbunden, daß bei den erwähnten Änderungen in den Fertiggut-und Rückgutmengen (22, 23) der zweiten Mahlstufe die Feingutmenge (Pfeil 12) aus dem ersten Sichter 2 über dessen Korbdrehzahl im Sinne einer Konstantregelung der Gesamtaufgabegutmenge dieser zweiten Mühle 3 veränderbar ist.The second grinding stage is now associated with a known electrical or electronic control device in such a way that the total feed quantity that can be fed to the second mill 3, ie the sum of the quantity of fresh material (Arrow 12) and the second quantity of return goods (arrow 23) can be regulated constantly, for which purpose the second quantity of fresh goods (arrow 12) conveyed by the first classifier 2 via the connection conveyor 11 as a function of changes in the quantity of returned goods and finished goods (arrows 22 and 23) from the second classifier 4 is regulated. For this purpose, this first control device of the second grinding stage is connected to the drive motor 9, which is variable in its speed, of the viewing basket 2a which determines the visual fineness, by a first controller (F GK ) 25 such that in the case of the changes mentioned in the quantities of finished goods and returned goods (22, 23) of the second grinding stage, the fine material quantity (arrow 12) from the first classifier 2 can be changed via its basket speed in the sense of a constant control of the total quantity of feed material of this second mill 3.

Ferner ist eine - ebenfalls elektrisch oder elektronisch arbeitende - zweite Regeleinrichtung in an sich bekannter Ausführung der ersten Mahlstufe zugeordnet. Die Zuordnung und Ausbildung dieser zweiten Regeleinrichtung ist derart, daß bei einer Änderung der ersten Feingutmenge (12) und der ersten Rückgutmenge (13) des zugehörigen ersten Windsichters 2 die erste Frischgutmenge (17) über ihre Zufördereinrichtung 8 im Sinne einer Konstantregelung der der ersten Mühle 1 zugeführten Gesamtaufgabegutmenge veränderbar ist. Zu diesem Zweck enthält diese zweite Regeleinrichtung außer üblichen Einstell- und Steuereinrichtungen mehrere Regler, von denen ein Regler FGP Mengenmeßsignale von der Bandwaage 14 (zur Erfassung der ersten Rückgutmenge 13), ein Regler FF zur Erfassung der Mengensignale vom Regler FGP sowie der Mengen- bzw. Gewichtssignale von den Bunker-Dosierwaagen 5a, 6a, 7a und ein weiterer Regler L für die Erfassung der Gesamtaufgabegutmenge im Mahlgutaufgabeschacht 15 von den Druckmeßdosen 16 vorgesehen ist. In allen Regeleinrichtungen sind die zugehörigen Verbindungen jeweils durch gestrichelte Linien angedeutet.Furthermore, a second control device, which also works electrically or electronically, is assigned to the first grinding stage in a design known per se. The assignment and design of this second control device is such that when the first fine material quantity (12) and the first return material quantity (13) of the associated first air classifier 2 change, the first fresh material quantity (17) is fed via its feed device 8 in the sense of constant control of the first mill 1 total amount of feed is changeable. For this purpose, this second control device contains, in addition to the usual setting and control devices, a number of controllers, one of which is a controller F GP for quantity measurement signals from the belt weigher 14 (for detecting the first quantity of returned goods 13), a controller F F for detecting the quantity signals from the controller F GP and the Quantity or weight signals from the bunker dosing scales 5a, 6a, 7a and another controller L for the detection of the total quantity of feed material in the grinding material feed shaft 15 is provided by the pressure load cells 16. In all control devices, the associated connections are indicated by dashed lines.

Die erste Mühle 1 für die Vorzerkleinerung in der ersten Mahlstufe und die zweite Mühle 3 für die Feinzerkleinerung in der zweiten Mahlstufe können an sich in jeder geeigneten Ausführung vorgesehen sein. Als besonders vorteilhaft hat es sich jedoch erwiesen, wenn, wie es in den beschriebenen Ausführungsbeispielen bevorzugt wird, die erste Mühle 1 durch eine an sich bekannte Walzenmühle mit zwei Walzen 1a, 1b gebildet wird, von denen wenigstens eine Walze in an sich bekannter Weise antreibbar ist und die zwischen sich einen Mahlspalt 1c für eine Gutbettzerkleinerung des zugeführten Mahlgutes bilden.The first mill 1 for pre-comminution in the first grinding stage and the second mill 3 for fine comminution in the second grinding stage can be provided per se in any suitable embodiment. However, it has proven to be particularly advantageous if, as is preferred in the exemplary embodiments described, the first mill 1 is formed by a roller mill known per se with two rollers 1a, 1b, at least one roller of which can be driven in a manner known per se is and between them form a grinding gap 1c for a material bed size reduction of the material to be fed.

Für die zweite Mahlstufe wird es dagegen vorgezogen, eine Trommel- oder Rohrmühle als zweite Mühle 3 vorzusehen, in der unter Einwirkung von Mahlkörpern das zugeführte Mahlgut feinzerkleinert wird, und besonders bevorzugt ist dabei eine an sich bekannte Ausführung als Kugelmühle.For the second grinding stage, on the other hand, it is preferred to provide a drum or tube mill as the second mill 3, in which the material to be ground is finely comminuted under the action of grinding media, and an embodiment known per se as a ball mill is particularly preferred.

Die Verfahrensweise zum Betrieb der in Fig. 1 veranschaulichten Mahlanlage ergibt sich bereits im wesentlichen aus der vorhergehenden Beschreibung. Wenn also im Praxisbetrieb dieser Mahlanlage beispielsweise ein feineres Endprodukt gewünscht wird oder durch eine schwerere Mahlbarkeit des aufgegebenen Mahlgutes der Fertiggutanteil (Pfeile 22) aus dem zweiten Sichter 4 der zweiten Mahlstufe herabgesetzt wird, dann fällt in diesem zweiten Sichter 4 - bei konstant gehaltener Durchsatzmenge - eine entsprechend größere zweite Rückgutmenge (Pfeile 23) an, mit der die zweite Mühle 3 belastet wird. Dementsprechend muß für eine konstant bleibende Durchsatzmenge in dieser zweiten Mahlstufe die dieser zweiten Mühle 3 als Frischgutmenge zuzuführende Feingutmenge (Pfeil 12) vom ersten Windsichter 2 entsprechend reduziert werden (durch entsprechende Drehzahländerung des Sichtkorbes 2a), damit über die erste Regeleinrichtung die zweite Gesamtaufgabegutmenge zur zweiten Mühle 3 konstantgeregelt werden kann. Dies bedeutet dann, daß aus dem ersten Windsichter 2 der ersten Mahlstufe eine entsprechend größere Grobgut- bzw. erste Rückgutmenge (Pfeile 13) anfällt, so daß dann über die dieser ersten Mahlstufe zugeordnete zweite Regeleinrichtung - in der erläuterten Weise - die von der Zufördereinrichtung 8 dem Mahlgutaufgabeschacht 15 der ersten Mühle 1 heranzuführende erste Frischgutmenge aus den Vorratsbunkern 5 bis 7 entsprechend verringert werden muß, damit auch die erste Gesamtaufgabegutmenge dieser ersten Mühle 1 konstantgeregelt werden kann. In entsprechend umgekehrter Weise erfolgt eine Konstantregelung, wenn ein größerer Anteil Feingut (Pfeile 22) als Fertiggut aus dem zweiten Sichter 4 der zweiten Mahlstufe abgezogen wird.The procedure for operating the grinding plant illustrated in FIG. 1 essentially results from the preceding description. If, for example, a finer end product is desired in practical operation of this grinding plant or if the proportion of finished product (arrows 22) from the second classifier 4 of the second grinding stage is reduced due to the fact that the feed material is more difficult to grind, then the following applies: this second sifter 4 - with a constant throughput quantity - a correspondingly larger second return quantity (arrows 23) with which the second mill 3 is loaded. Accordingly, for a constant throughput in this second grinding stage, the amount of fines (arrow 12) to be fed to this second mill 3 as a fresh material quantity must be reduced accordingly (by a corresponding change in the speed of the viewing basket 2a), so that the second total feed quantity to the second one via the first control device Mill 3 can be regulated constantly. This then means that from the first air classifier 2 of the first grinding stage a correspondingly larger amount of coarse material or first return material is produced (arrows 13), so that then via the second control device assigned to this first grinding stage - in the manner explained - that from the feed device 8 the first quantity of fresh material from the storage bunkers 5 to 7 to be brought into the grinding material feed shaft 15 of the first mill 1 must be reduced accordingly so that the first total quantity of feed material of this first mill 1 can also be regulated constantly. In a correspondingly reversed manner, constant control takes place when a larger proportion of fine material (arrows 22) is withdrawn as finished product from the second classifier 4 of the second grinding stage.

Anhand des Teil-Fließschemas gemäß Fig. 2 wird ein zweites Ausführungsbeispiel bzw. eine Ausführungsvariante der zuvor anhand Fig. 1 beschriebenen Mahlanlage erläutert, wozu lediglich vor allem die hierfür erforderlichen Anlagenteile und dabei insbesondere der Verbindungsbereich vor allem von der ersten Mahlstufe zur zweiten Mahlstufe veranschaulicht und erläutert sei. Der Einfachheit halber sind alle gleichartig zum ersten Beispiel ausgeführten Anlagenteile mit denselben Bezugszeichen wie im ersten Beispiel (Fig. 1) bezeichnet, so daß diese Anlagenteile nicht nochmal einzeln erläutert werden müssen.A second exemplary embodiment or an embodiment variant of the grinding plant described above with reference to FIG. 1 is explained with the aid of the partial flow diagram according to FIG. 2, for which purpose only the parts of the plant required for this, and in particular the connection area, especially from the first grinding step to the second grinding step, are illustrated and be explained. For the sake of simplicity, they are all the same Plant parts executed in the first example are designated by the same reference numerals as in the first example (FIG. 1), so that these plant parts do not have to be explained again individually.

Während in der Mischanlage nach dem ersten Beispiel (Fig. 1) die Verbindungseinrichtung für die Zufuhr des aus dem ersten Sichter 2 der ersten Mahlstufe kommenden Feingutes (Pfeil 12) in der Hauptsache durch einen Verbindungsförderer gebildet wird, enthält diese Verbindungseinrichtung in diesem zweiten Ausführungsbeispiel (Fig. 2) neben dem Verbindungsförderer 11' (als Feingutförderer) noch einen Zwischensilo 30, der zwischen dem Verbindungsförderer 11' und dem Guteinlauf 3a der zweiten Mühle 3 der Feinmahlstufe angeordnet und in seiner Zwischenspeichermenge steuerbar ist. Zu diesem Zweck kann der Zwischensilo 30 mit an sich bekannten Füllstands-Steuereinrichtungen ausgestattet oder - wie in diesem Beispiel bevorzugt - auf Druckmeßdosen 31 angeordnet sein, um die Zwischenspeichermengen in geeigneter Weise steuern zu können. Dem Auslauf 30a dieses Zwischensilos 30 ist ein Auslauf-Dosierorgan 32 in an sich bekannter Ausführung zugeordnet. Erst von diesem Auslauf-Dosierorgan 32 wird das aus dem ersten Sichter 2 kommende Feingut (Pfeil 12) als zweite Frischgutmenge genau und mit veränderbarer Steuerung (Dosierung) dem Guteinlauf 3a der zweiten Mühle 3 zugeführt, und zwar zusammen mit der vom zweiten Sichter 4 der zweiten Mahlstufe wieder zurückgeführten zweiten Rückgutmenge (Pfeile 23); im Bedarfsfalle kann zwischen dem Auslauf-Dosierorgan 32 und dem Guteinlauf 3a der zweiten Mühle 3 noch ein weiterer Überhebeelevator angeordnet werden, wie es bei 33 strichpunktiert angedeutet ist.While in the mixing plant according to the first example (FIG. 1) the connecting device for the supply of the fine material coming from the first sifter 2 of the first grinding stage (arrow 12) is mainly formed by a connecting conveyor, this connecting device in this second exemplary embodiment contains ( Fig. 2) in addition to the connection conveyor 11 '(as a fine material conveyor) still an intermediate silo 30, which is arranged between the connection conveyor 11' and the material inlet 3a of the second mill 3 of the fine grinding stage and is controllable in its intermediate storage quantity. For this purpose, the intermediate silo 30 can be equipped with fill level control devices known per se or, as is preferred in this example, can be arranged on pressure measuring cells 31 in order to be able to control the intermediate storage quantities in a suitable manner. The outlet 30a of this intermediate silo 30 is assigned an outlet metering device 32 in a design known per se. Only from this outlet dosing element 32 is the fine material coming from the first classifier 2 (arrow 12) as a second quantity of fresh material and with variable control (metering) fed to the product inlet 3a of the second mill 3, together with that from the second classifier 4 second amount of returned material returned in the second grinding stage (arrows 23); if necessary, a further lifting lever can be arranged between the outlet dosing element 32 and the material inlet 3a of the second mill 3, as is indicated by dash-dotted lines at 33.

Bei dieser Ausführungsvariante gemäß Fig. 2 ist die erste Regeleinrichtung für die zweite Mahlstufe dann in der Weise abgewandelt, daß ein erster Regler (L) 34 in der - nur gestrichelt angedeuteten - Steuerverbindung zwischen den Druckmeßdosen 31 des Zwischensilos 30 und dem in seiner Drehzahl veränderbaren Antriebsmotor 9 für den Sichtkorb 2a des ersten Windsichters 2 und ein zweiter Regler (R) 35 dieser ersten Regeleinrichtung in einer - ebenfalls nur gestrichelt angedeuteten - Steuerverbindung zwischen der als Waage 24 ausgebildeten Rückgutmengen-Meßvorrichtung und dem Auslauf-Dosierorgan 32 angeordnet ist.In this embodiment variant according to FIG. 2, the first control device for the second grinding stage is then modified in such a way that a first controller (L) 34 in the control connection (only indicated by dashed lines) between the pressure transducers 31 of the intermediate silo 30 and the speed which can be changed Drive motor 9 for the sight basket 2a of the first air classifier 2 and a second controller (R) 35 of this first regulating device is arranged in a control connection - likewise indicated only by dashed lines - between the return material quantity measuring device designed as a scale 24 and the outlet metering element 32.

In diesem Falle (Fig. 2) kann somit die vom ersten Sichter (2) der ersten Mahlstufe dem Guteinlauf 3a der zweiten Mühle 2 zuzuführende Feingutmenge (Pfeile 12) vor der Zusammenführung mit der zweiten Rückgutmenge (Pfeile 23) aus dem zweiten Sichter 4, also vor dem genannten Mühlen-Guteinlauf 3a, zunächst zwischengespeichert und dann in einer für die Konstantregelung mit der jeweils aus dem zweiten Sichter 4 herangeführten zweiten Rückgutmenge (Pfeile 23) angepaßten Menge gesteuert abgerufen werden. Demnach wird auch in diesem Falle dann insgesamt die für die Konstantregelung der Gesamtaufgabegutmenge zur zweiten Mühle 3 erforderliche Frischgutmenge (Feingutmenge 12 aus dem ersten Sichter 2) dadurch geregelt, daß der Sichtkorb 2a in seiner Drehzahl und somit dieser erste Sichter 2 in seiner Sichtfeinheit entsprechend angepaßt wird.In this case (FIG. 2), the fine material quantity (arrows 12) to be fed from the first classifier (2) of the first grinding stage to the material inlet 3a of the second mill 2 (arrows 12) can be extracted from the second classifier 4, that is, before the above-mentioned mill infeed 3a, initially temporarily stored and then called up in a controlled quantity adapted for constant control with the second return quantity (arrows 23) respectively brought in from the second sifter 4. Accordingly, in this case as well, the total quantity of fresh material required for constant control of the total quantity of feed to the second mill 3 (quantity of fine material 12 from the first sifter 2) is regulated in that the viewing basket 2a is adjusted accordingly in terms of its speed and thus this first sifter 2 in its visual fineness becomes.

Während anhand der Fig. 1 und 2 bisher Ausführungsbeispiele von Mahlanlagen und Zerkleinerungsverfahren beschrieben worden sind, bei denen jede Mahlstufe nach Art eines Umlaufmahlsystems mit je einer Mühle und einem zugehörigen Windsichter arbeitet, besteht gemäß einer besonders einfachen Ausführungsform aber auch die Möglichkeit, in der zweiten Mahlstufe den Sichter wegzulassen und das in der zweiten Mühle der zweiten Mahlstufe feinzerkleinerte Gut insgesamt als Fertiggut (Fertiggutmenge) abzuführen. Da diese zweite Mühle bevorzugt als Rohrmühle, Kugelmühle oder dergleichen ausgebildet ist, besteht hier die Möglichkeit, den durch diese zweite Mühle hindurchzuführenden Luftstrom so einzustellen, daß das mit ihm aus dieser Mühle ausgetragene, genügend feinzerkleinerte Gut insgesamt als Fertiggut abgeführt werden kann. In diesem Falle bildet dann das von dem Sichter der ersten Mahlstufe zur zweiten Mühle der zweiten Mahlstufe herangeführte Frischgut die Gesamtaufgabegutmenge dieser zweiten Mühle, wobei die Konstantregelung dann in Abhängigkeit von dem aus dieser zweiten Mühle als Fertiggutmenge ausgetragenen, feinzerkleinerten Gut mit Hilfe der Sichtfeinheits-Einstellvorrichtung des Windsichters der ersten Mahlstufe konstantgeregelt wird. Diese Verfahrensweise dürfte ohne zusätzliche zeichnerische Darstellung leicht vorstellbar sein, das - im Vergleich zu den Beispielen gemäß Fig.1 und 2 - im wesentlichen nur der zweite Windsichter entfällt.While embodiments of grinding plants and comminution processes have been described so far with reference to FIGS. 1 and 2, in which each grinding stage follows Type of a circulation grinding system, each with a mill and an associated wind sifter, there is, according to a particularly simple embodiment, the possibility to omit the classifier in the second grinding stage and to remove the finely comminuted goods in the second mill of the second grinding stage as finished goods (finished goods quantity). Since this second mill is preferably designed as a tube mill, ball mill or the like, there is the possibility here of adjusting the air flow to be passed through this second mill so that the sufficiently finely comminuted material discharged from it with this mill can be removed as a finished product. In this case, the fresh material brought in from the classifier of the first grinding stage to the second mill of the second grinding stage forms the total feed quantity of this second mill, the constant control then depending on the finely comminuted material discharged from this second mill as finished product quantity with the aid of the visual fineness setting device of the air classifier of the first grinding stage is constantly regulated. This procedure should be easy to imagine without an additional graphic representation, which - compared to the examples according to FIGS. 1 and 2 - essentially only eliminates the second air classifier.

Darüber hinaus ist es grundsätzlich auch möglich, den zweiten Windsichter in der zweiten Mahlstufe beizubehalten und trotzdem das im Sichter getrennte Gut insgesamt als Fertiggut abzuführen, indem der Feingutanteil einen feineren ersten Fertiggutanteil und das Grobgut (Grieße) einen gröberen zweiten Fertiggutanteil darstellen.In addition, it is in principle also possible to maintain the second air classifier in the second grinding stage and still remove the goods separated in the classifier as finished goods, in that the fine material portion represents a finer first finished product portion and the coarse material (grit) represents a coarser second finished product portion.

Claims (15)

  1. Method for two-stage comminution of brittle material for grinding, such as cement materials, in which
    a) the material for grinding is subjected to primary comminution in a first grinding stage with a first mill,
    b) material which has been subjected to primary comminution is delivered as fresh material to the mill of a second grinding stage where it is subjected to fine reduction,
    c) at least part of the finely comminuted material from this second grinding stage is removed as finished product,
    d) the quantity of feed material delivered to the second mill is kept constant depending upon the quantity of finished product removed from the second grinding stage,
    characterised by the following features:
    e) all of the material subjected to primary comminution in the first mill is first of all classified in a separator belonging to the first grinding stage into a quantity of oversize material to be delivered to this first mill as the first quantity of recycled material and a quantity of fines to be delivered to the second mill as a second quantity of fresh material;
    f) when the quantity of finished product of the second grinding stage delivered to the second mill alters, the quantity of feed material delivered to the second mill is kept constant by altering the quantity of fines delivered to the second mill as a second quantity of fresh material from the separator of the first grinding stage by corresponding adjustment of the fineness of separation of the separator; and
    g) the first total quantity of feed material delivered to the first mill consisting of a quantity of fresh material delivered from a store and a quantity of recycled material from the separator of the firs( grinding stage are also kept constant by corresponding adaptation of this first quantity of fresh material when the quantities of fines and recycled material of this separator are altered.
  2. Method as claimed in claim 1, characterised in that the first grinding stage and the second grinding stage operate in the manner of a closed-circuit grinding system, each having a mill and a separator, and the material which has been subjected to fine comminution from the second mill is separated in a separator belonging to the second grinding stage at least into one quantity of fines forming a finished product and one quantity of oversize material which undergoes further comminution as a quantity of recycled material together with the quantity of fresh material from the first separator of the first grinding stage, and in which the second total quantity of feed material delivered to the second mill is kept constant when the quantities of finished product and recycled material from the second separator change by altering the quantity of fines delivered to the second mill as a second quantity of fresh material from the first separator of the first grinding stage by corresponding adjustment of the fineness of separation of this first separator.
  3. Method as claimed in claim 2, characterised in that a centrifugal air separator is used at least in the first grinding stage, preferably in both grinding stages, and the fineness of separation of each air separator is adjusted by altering the speed at which separator elements rotate.
  4. Method as claimed in claim 1, characterised in that the material for grinding in the first grinding stage is subjected to material bed comminution in the roll gap between two rolls of a material bed roll mill.
  5. Method as claimed in claim 1, characterised in that the material for grinding in the second grinding stage is subjected to fine reduction under the effect of grinding elements in a drum mill or tube mill.
  6. Method as claimed in claim 1, characterised in that the quantity of fines to be delivered from the first separator of the first grinding stage to the second mill of the second grinding stage is put in intermediate store before being delivered to this second mill.
  7. Method as claimed in claim 2, characterised in that the quantity of fines to be delivered from the first separator of the first grinding stage to the second mill of the second grinding stage is put in intermediate store before being combined with the second quantity of recycled material from the second separator and is called off in a controlled manner in a quantity adapted for keeping constant with the second quantity of recycled material.
  8. Grinding plant for two-stage comminution of brittle material for grinding, such as cement materials, containing
    a) a first grinding stage constructed for the primary comminution and having a first mill (1),
    b) a feed arrangement (8) which is controllable in its conveying capacity for feeding fresh material to the first mill (1),
    c) a second grinding stage which is connected after the first grinding stage and is intended for fine comminution and which is constgructed with a second mill (3) and an air separator (4) in the form of a closed-circuit grinding system in which the finely comminuted material is separated in the air separator into a quantity of fines to be removed as finished product and a quantity of oversize material which can be returned to the second mill as a quantity of recycled material,
    d) a connecting arrangement (11, 11', 30) for the delivery of material which has undergone primary comminution from the first grinding stage as as a quantity of fresh material (12) to the second mill (3) of the second grinding stage,
    e) a regulating arrangement for the second grinding stage which is constructed in such a way that the total quantity of feed material consisting of a quantity of fresh material and a quantity of recycled material which can be delivered to the second mill can be kept constant and for this purpose the quantity of fresh material coming from the first grinding stage can be regulated depending upon alterations in the quantities of recycled material and finished product from the air separator (4) of the second grinding stage,
    characterised by the combination of the following features:
    f) the first grinding stage is also constructed in the form of a closed-circuit grinding system with the first mill (1) and a first air separator (2) which has a fineness adjustment device (2a) and to which all of the material for grinding (18) which has undergone primary comminution from the first mill can be delivered;
    g) the connecting arrangement (11, 11', 13) between the two grinding stages connects the fines outlet (2c) of the first air separator (2) to the material inlet (3a) of the second mill (3);
    h) the regulating arrangement for the second grinding stage is connected to the fineness adjustment device (2a) of the first air separator (2) by a regulator (25) in such a way that in the event of alterations in the quantities of finished product and recycled material (22, 23) from the second grinding stage the quantity of fines (12) from the first air separator (2) can be altered by means of its fineness adjustment device in order to keep the total quantity of feed material of the second mill (3) constant;
    i) a second regulating arrangement is co-ordinated with the first grinding stage in such a way that in the event of an alteration in the quantity of fines (12) and the quantity of recycled material (13) from the appertaining first air separator (2) the quantity of fresh material (17) can be altered by means of its feed arrangement (8) in order to keep the total quantity of feed material delivered to the first mill (1) constant.
  9. Grinding plant as claimed in claim 8, characterised in that at least the first air separator (2) of the first grinding stage is constructed as a centrifugal air separator, and its fineness adjustment devices (2a) have a drive which is infinitely variable in speed.
  10. Grinding plant as claimed in claim 9, characterised in that each air separator (2, 4) is formed by a distributor plate or cage air separator.
  11. Grinding plant as claimed in claim 8, characterised in that the first mill (1) of the first grinding stage is formed by a roll mill with two rolls (1a, 1b) of which at least one roll can be driven and which form a roll gap (1c) between them for material bed comminution.
  12. Grinding plant as claimed in claim 11, characterised in that a feed shaft (15) for material for grinding with a regulable quantity of feed material is co-ordinated with the roll mill (1).
  13. Grinding plant as claimed in claim 8, characterised in that a tube or drum mill, particularly a ball mill, which is constructed for the fine comminuion is provided as the second mill (3) of the second grinding stage.
  14. Grinding plant as claimed in claim 9, characterised in that a device (24) for measuring quantities of recycled material is co-ordinated with the material inlet (3a) of the second mill (3), this measuring device being in control connection with the regulator (25) of the first regulating arrangement for the fineness adjustment device (2a) of the first air separator (2).
  15. Grinding plant as claimed in claim 9, characterised in that a device (24) for measuring quantities of recycled material is co-ordinated with the material inlet (3a) of the second mill (3) and that the connecting arrangement between the two grinding stages contains a fines conveyor (11') and an intermediate silo (30) which is arranged between this fines conveyor and the material inlet (3a) of the second mill (3) and in which the quantity of material in intermediate store in it can be controlled, and a first regulator (34) of the first regulating arrangement co-ordinated with the second grinding stage and acting on the fineness adjustment device (2a) of the first air separator (2) is arranged in the control connection between a control device (31) of the intermediate silo for controlling the quantities in intermediate storage and the said adjustment device (2a) of the first air separator and a second regulator (35) of,this first regulating arrangement is arranged in a control connection between the device (24) for measuring the quantities of recycled material and an outlet proportioning device (32) of the intermediate silo.
EP90125239A 1990-02-20 1990-12-21 Process and plant for two-stage grinding of brittle materials Expired - Lifetime EP0447669B1 (en)

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DE4005323 1990-02-20
DE4005323A DE4005323A1 (en) 1990-02-20 1990-02-20 Crushing plant for cement material - involves first stage accepting pre-crushed material, and feeding to second stage with constant output regulation

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ZA91799B (en) 1992-01-29
ES2043233T3 (en) 1993-12-16
DE59001862D1 (en) 1993-07-29
DE4005323A1 (en) 1991-08-22
US5110056A (en) 1992-05-05

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