EP2125230B1 - Method for the continuous dry milling process of a vertical grinding mill and vertical grinding mill - Google Patents

Method for the continuous dry milling process of a vertical grinding mill and vertical grinding mill Download PDF

Info

Publication number
EP2125230B1
EP2125230B1 EP08700982.5A EP08700982A EP2125230B1 EP 2125230 B1 EP2125230 B1 EP 2125230B1 EP 08700982 A EP08700982 A EP 08700982A EP 2125230 B1 EP2125230 B1 EP 2125230B1
Authority
EP
European Patent Office
Prior art keywords
grinding
gas
milling container
package
inlet
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP08700982.5A
Other languages
German (de)
French (fr)
Other versions
EP2125230B8 (en
EP2125230A1 (en
Inventor
Stefan Gerl
Jens Sachweh
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Maschinenfabrik Gustav Eirich GmbH and Co KG
Original Assignee
Maschinenfabrik Gustav Eirich GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Maschinenfabrik Gustav Eirich GmbH and Co KG filed Critical Maschinenfabrik Gustav Eirich GmbH and Co KG
Priority to PL08700982T priority Critical patent/PL2125230T3/en
Publication of EP2125230A1 publication Critical patent/EP2125230A1/en
Application granted granted Critical
Publication of EP2125230B1 publication Critical patent/EP2125230B1/en
Publication of EP2125230B8 publication Critical patent/EP2125230B8/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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
    • B02C17/16—Mills in which a fixed container houses stirring means tumbling the charge
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
    • B02C17/18—Details
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
    • B02C17/18—Details
    • B02C17/183—Feeding or discharging devices
    • B02C17/1835—Discharging devices combined with sorting or separating of material
    • B02C17/184—Discharging devices combined with sorting or separating of material with separator arranged in discharge path of crushing zone
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
    • B02C17/18—Details
    • B02C17/183—Feeding or discharging devices
    • B02C17/186—Adding fluid, other than for crushing by fluid energy
    • B02C17/1875—Adding fluid, other than for crushing by fluid energy passing gas through crushing zone
    • B02C17/188—Adding fluid, other than for crushing by fluid energy passing gas through crushing zone characterised by point of gas entry or exit or by gas flow path
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C19/00—Other disintegrating devices or methods
    • B02C19/22—Crushing mills with screw-shaped crushing means

Definitions

  • the invention relates to a method for the continuous dry grinding operation of a tower friction mill according to the preamble of claim 1 and a tower friction mill according to the preamble of claim 10.
  • a generic tower friction mill is from the U.S. Patent 4,754,934 known.
  • the gas is introduced at the bottom of the grinding container and flows through the packing of grinding media and millbase.
  • a centrifuge is mounted on the drive shaft, which is intended to eject the grinding material particles conveyed upwards from the gas flow and to feed them directly back into the grinding process by gravity. So that the introduced from below into the packing of grinding media gas stream loosens this pack and discharges up the Mahlgutp personality at the top of the mill, the gas must have a considerable pressure.
  • this package must be relatively open-pored, ie the size of the grinding media is limited down.
  • the material to be ground must be relatively coarse. This in turn means that the spaces between the individual grinding bodies are insufficiently filled with regrind.
  • the energy consumption for the pressure blower is very high and is of the same order of magnitude as the energy consumption of the drive motor for the actual grinding process.
  • a tower grate mill known in which the ground material is introduced from above into the grinding container and discharged in the region of the bottom through a sieve.
  • a fluid for example in the form of air
  • a comparable tower friction mill is from the JP 2003 181 316 A known.
  • the sieve holes or sieve gaps in the bottom area can become clogged by worn or broken grinding media. This in turn leads to increased wear, which can eventually lead to damage to the lower ends of the screw webs.
  • Another disadvantage is that well-flowing ground material, such as dry quartz sand, flows very quickly through the MahlSystempackung and thus is not subjected to a controlled grinding process.
  • the invention has for its object to provide a method of the generic type and a tower grate mill of the generic type, in which a continuous dry grinding operation while maintaining the packing of grinding media in the grinding container is possible and in which the Use of relatively small grinding media and a high fineness of the ground material to be ground is achieved.
  • the packing of grinding media is dense during the entire grinding process, as it is not loosened from below, for example by gas.
  • the grinding bodies are conveyed upwards in the area covered by at least one screw land and accordingly flow downwards in the area not covered by the screw land, which is bounded externally by the grinding tank.
  • the millbase is thus at least once fully funded by the grinding media package from top to bottom and once from bottom to top and thereby subjected to a grinding process.
  • the media package Due to the conveying effect of the worm web in the region of the drive shaft, the media package is raised in the interior of the grinding container and forms an approximately frusto-conical, sloping outward surface, over which the grinding media roll to the outside. In this case, they press out the grinding stock on the surface or in the surface through the grinding stock outlet from the grinding container, whereby this is still supported to a considerable extent by the gas flow.
  • the tower grate mill shown in the drawing has a closed top, cylindrical grinding container 1, for whose inner diameter D applies: 0.4 m ⁇ D ⁇ 4.0 m.
  • a screw conveyor 2 is arranged as a grinding-body circulation device, which is arranged coaxially to the vertical center axis 3 of the grinding container 1.
  • the Screw conveyor 2 has a coaxial with the central axis 3 arranged drive shaft 4 with a diameter di on which two mutually parallel screw webs 5 with a slope s and an outer diameter da and an upper end 6 are attached.
  • the shaft 4 is rotationally driven by means of an electric motor 7 in a rotational direction 8.
  • the screw conveyor 4 extends down to the immediate vicinity of the bottom 9 of the grinding container 1.
  • the screw-webs 5 extend from this neighborhood to the bottom 9 over a height hs.
  • the tower grinder mill is very slim. For the ratio of the screw height hs to the diameter D of the grinding container 1, 1.5 ⁇ hs / D ⁇ 3.
  • a closed during operation MahlSystem outlet 10 is provided in the vicinity of the bottom 9 of the grinding container 1 in the latter.
  • a grinding stock outlet 11 is formed on the grinding container 1, to which a grinding stock removal line 12 connects.
  • a grinding media retention device in the form of a gap-sieve 14 is arranged, which in the 4 and 5 is shown. It has between approximately parallel to the central axis 3 extending webs 15 column 16, which - as out Fig. 4 can be seen - extend radially to the axis 3 to the outside and continue to expand from bottom to top, as from Fig. 5 seen. At least in the lower region, its width w is smaller than the diameter d 17 of the smallest grinding media 17 used.
  • the outlet opening 13 has a height h13.
  • the worm webs 5 extend from 0.1 h 13 to 0.5 h 13 over the lower edge 18 of the outlet opening 13, ie its upper end 6 is located at this height above the Bottom edge 18.
  • the cross-sectional area swept by the screw lands 5 is (da 2 - di 2 ) x ⁇ / 4.
  • the free annular cross-sectional area between the worm webs 5 and the grinding container is (D 2 - da 2 ) x ⁇ / 4.
  • the free cross-sectional area between the worm webs 5 and the grinding container 1 should be greater than or at most equal to the swept by the worm webs 5 annular cross-section. The following applies: (D 2 - da 2 ) ⁇ (da 2 - di 2 ) .
  • Fig. 1 opens a Mahlgut inlet 19 diametrically opposite the Mahlgut-outlet 11 in the grinding container 1 a. It is arranged above the upper end 6 of the worm webs 5, specifically starting above the upper edge 20 of the outlet opening 13.
  • the grinding stock inlet 19 is preceded by a grinding material feed line 21 into which the grinding material 22 is gas-tight Dosing device 23, for example, a rotary valve, is supplied.
  • a gas inlet 24 open to the atmosphere in this case an air inlet, is provided.
  • the regrind discharge line 12 is connected to a suction fan 25, with the interposition of a wind sifter 26, for example, a conventional cyclone separator, and a downstream of this dust filter separator 27.
  • a wind sifter 26 for example, a conventional cyclone separator
  • a Filter 28 is provided in the separator 27 . It is connected to the bottom of a gas-tight lock 29, such as a rotary valve. From the wind sifter 26 is coarse material to be ground via a return line 30 of the metering device 23 and thus fed to the grinding stock inlet 19 again.
  • the millbase discharged from the separator 27 has the desired fineness.
  • a pressure transducer 31 is arranged in the grinding container 1.
  • a further pressure transducer 32 is arranged in the regrind discharge line 12 relatively close behind the grinding stock outlet 11. Their pressure readings are applied to a differential pressure gauge 33 for determining the pressure difference between the two measured values.
  • a gas volume meter 34 is disposed between the separator 27 and the blower 25.
  • an additional gas line 35 which can be opened or closed via a controllable valve 36, opens into the grinding stock removal line 12 in the vicinity of the grinding stock outlet 11. About this additional gas can be introduced into the conduit 12 when the gas volume flow coming from the grinding container 1 is not sufficient to remove the ground material.
  • a gas flow meter 37 is inserted in this line 35.
  • the grinding container 1 Before commissioning the grinding container 1 is filled with grinding media 17, up to a height which is 80% to 95% of the height of the grinding container 1 to the upper end 6 of the screw webs 5 to just above the lower edge 18 of the outlet opening thirteenth is. Subsequently, the motor 7 is set in operation, so that the shaft 4 is set with the worm webs 5 in the direction of rotation 8 in operation. Corresponding to the pitch of the worm webs 5, the grinding bodies 17, which are located in the annular cross-sectional area of the grinding container 1 swept by the worm webs 5, are conveyed upwards.
  • the worm webs 5 are in proportion to the pitch s to the outer diameter da screw flights 5 0.5 da ⁇ s ⁇ 1.5 da and preferably 0.8 da ⁇ s ⁇ 1.2 da. Furthermore, the shaft 4 is driven with the worm webs 5 at such a speed that the worm webs 5 an outer peripheral speed of 2.0 to 4.0 m / sec and preferably between 2.2 and 3.0 m / sec.
  • the diameter d17 of the grinding bodies 17 the following applies: 10 mm ⁇ d17 ⁇ 30 mm and preferably 15 mm ⁇ d17 ⁇ 25 mm.
  • the supplied millbase 22 generally has a particle size which is smaller than 0.25 d17 of the diameter d17 of the grinding bodies 17 and preferably less than 0.2 d17. Since the grinding media 17 are conveyed upwards in the region of the screw flights 5, they sink downwards in the outer region not swept by the screw flights 5, as indicated by the circulation flow arrows 38 in FIG Fig. 1 is indicated. The millbase fed in the area of the container wall flows downwards with the grinding bodies 17 and is crushed between them. Connecting ⁇ end it is promoted again with further comminution with the grinding media 17 in the area of the screw webs 5 upwards.
  • the grinding media 17 are only slightly, up to 0.3 h 13, above the lower edge 18 of the outlet opening 13 and the screen 14.
  • regrind 22 which swells radially outward from the packing of grinding media 17, directly in front of the sieve 14.
  • air is sucked in from outside through the gas inlet 24 by the blower 25 and flows around the shaft 4 in accordance with the deflection arrow 40 and over the surface 39 of the grinding-body packing.
  • the gas inlet 24 is predominantly orthogonal, ie substantially directed to the axis 3, then only a simple deflection by 180 ° of the air around the shaft 4. If, however, the gas inlet 24 is arranged predominantly tangentially, then forms a rotational flow out.
  • the conveyed according to the deflection arrow 40 through the grinding container 1 air takes very fine ground material 22, which is fed through the Mahlgut inlet 19, directly with and carries it directly.
  • the gas stream enters the regrind discharge line 12 through the sieve 14.
  • the described gas flow in this case pushes the grinding material 22 located in the grinding container 1 in front of the sieve 14 into the line 12. As far as grinding bodies 17 reach the sieve 14, they are retained by this.
  • the entire material to be ground 22 is discharged after a described circulation.
  • the coarse grinding stock 22 which has not yet been sufficiently comminuted is separated off and returned to the grinding process by the return line 30 and via the metering device 23.
  • the conveying air enters together with the finely ground material to be ground 22 in the dust filter 27, where the finely ground material is deposited on the filter 28 and discharged through the lock 29.
  • the freed from the material to be ground 22 air is discharged through the blower 25.
  • the air additionally can be added via the additional gas line 35 of the conveying air.
  • the design of the actual tower friction mill after Fig. 2 is different from the after Fig. 1 by the arrangement of the gas inlet 24 '. This is located opposite the regrind outlet 11 above the millbase inlet 19.
  • the air flow flows around here corresponding to the flow arrow 41, the shaft 4 and then - as in the embodiment according to Fig. 1 over the surface 39 of the grinding material-MahlSystem-packing and presses the ground material 22 through the sieve 14 in the Mahlgut-discharge line 12.
  • the gas inlet 24 'in the direction of the shaft 4 is moved into the grinding container 1, so that the entering through the Mahlgut inlet 19 Mahlgut 22 can flow directly to the inner wall of the grinding container 1 down into the grinding media package.
  • Fig. 3 differs from the two previously illustrated in that the gas flow is not sucked by means of a suction fan. Rather, a pressure blower 42 is provided, which pushes gas with an arbitrary predeterminable pressure through a gas inlet 24 "from above into the grinding container 1. The gas flows according to the flow arrow 43 from above through the grinding container 1 and then over the Surface 39 to the grinding stock outlet 11 and presses in the manner already described, the material to be ground 22 through the sieve 14th
  • any pressure can be adjusted. So that according to the flow arrow 43 in the grinding container 1 after Fig. 3 inflowing gas does not pass through the grinding stock inlet 19 regrind 22nd entrains or swirled above the media package, the Mahlgut inlet 19 is covered by a guide plate 44 so that the Mahlgut-entry is not affected by the gas flow.
  • a guide plate 44 to cover the grinding stock inlet 19 in the embodiments of the Fig. 1 and 2 be used if necessary.
  • the grinding media outlet 10 ' is provided in the bottom 9 of the grinding container 1, whereby the removal of the grinding media 17 from the grinding container 1 can be facilitated.
  • a difference-pressure measurement is made via the measuring device 33 and the corresponding measured value is passed to a central control unit 45. If the measured differential pressure exceeds a predetermined setpoint, this may be an indication that the screen 14 is partially or completely clogged.
  • the fan unit 25 or the blower 42 can be controlled by the control unit 45 in order to increase and / or the main gas volume flow, which is supplied via the gas inlet 24, 24 'or 24 " The aim is to suck in more gas through the sieve 14 in such a case.
  • a main gas flow rate through the meter 34 which are promoted by the fan 25 and 42, respectively should.
  • the secondary gas volume flow to be supplied via the additional gas line 35 is adjusted so that a predetermined desired gas volume flow is conveyed through the grinding container 1. This funded by the grinding container 1 target gas flow rate results from the difference of the main gas volume flow and the secondary gas flow rate. If the gas volume flows are constantly measured via the measuring devices 34 and 37, it follows from an increase in the volume flow detected by the measuring device 37 that the screen 14 is partially or completely blocked. In such a case, the total gas volume flow to be delivered by the fan 25 or 42 is increased. At the same time, the valve 36 is partially or completely closed to achieve in this way a higher gas flow rate through the grinding container 1, and thus to blow the screen 14. Cumulatively, the already described differential pressure measurement can also be used.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Description

Die Erfindung betrifft ein Verfahren zum kontinuierlichen Trocken-Mahl-Betrieb einer Turm-Reib-Mühle nach dem Oberbegriff des Anspruches 1 und eine Turm-Reib-Mühle nach dem Oberbegriff des Anspruches 10.The invention relates to a method for the continuous dry grinding operation of a tower friction mill according to the preamble of claim 1 and a tower friction mill according to the preamble of claim 10.

Eine gattungsgemäße Turm-Reib-Mühle ist aus der US-PS 4,754,934 bekannt. Hierbei wird das Gas am Boden des Mahlbehälters eingeführt und durchströmt die Packung aus Mahlkörpern und Mahlgut. Im oberen Bereich des Mahlbehälters, deutlich oberhalb des Mahlgut-Einlasses, ist auf der Antriebs-Welle eine Zentrifuge angebracht, die vom Gasstrom nach oben geförderte Mahlgutpartikel abschleudern und dem Mahlprozess durch Schwerkraft direkt wieder zuführen soll. Damit der von unten in die Packung aus Mahlkörpern eingeführte Gasstrom diese Packung auflockert und nach oben die Mahlgutpartikel am oberen Ende der Mühle austrägt, muss das Gas einen erheblichen Druck haben. Durch die erwähnte Auflockerung der Packung aus Mahlkörpern und umlaufend gefördertem Mahlgut wird der Mahleffekt, d. h. die Zerkleinerungsleistung reduziert. Damit der Druckverlust in der Packung aus Mahlkörpern und Mahlgut sich noch in vertretbaren Grenzen hält, muss diese Packung verhältnismäßig offenporig sein, d. h. die Größe der Mahlkörper ist nach unten begrenzt. Außerdem muss das Mahlgut verhältnismäßig grob sein. Dies hat wiederum zur Folge, dass die Zwischenräume zwischen den einzelnen Mahlkörpern nur unzureichend mit Mahlgut gefüllt sind. Darüber hinaus ist der Energieverbrauch für das Druck-Gebläse sehr hoch und liegt in der gleichen Größenordnung, wie der Energieverbrauch des Antriebs-Motors für den eigentlichen Mahlprozess.A generic tower friction mill is from the U.S. Patent 4,754,934 known. Here, the gas is introduced at the bottom of the grinding container and flows through the packing of grinding media and millbase. In the upper part of the grinding container, well above the regrind inlet, a centrifuge is mounted on the drive shaft, which is intended to eject the grinding material particles conveyed upwards from the gas flow and to feed them directly back into the grinding process by gravity. So that the introduced from below into the packing of grinding media gas stream loosens this pack and discharges up the Mahlgutpartikel at the top of the mill, the gas must have a considerable pressure. By the mentioned loosening of the packing of grinding media and circumferentially conveyed regrind the grinding effect, ie the crushing performance is reduced. So that the pressure loss in the packing of grinding media and millbase is still within reasonable limits, this package must be relatively open-pored, ie the size of the grinding media is limited down. In addition, the material to be ground must be relatively coarse. This in turn means that the spaces between the individual grinding bodies are insufficiently filled with regrind. In addition, the energy consumption for the pressure blower is very high and is of the same order of magnitude as the energy consumption of the drive motor for the actual grinding process.

Aus der DE 42 02 101 A1 ist eine Turm-Reib-Mühle bekannt, bei der das Mahlgut von oben in den Mahlbehälter eingeführt und im Bereich des Bodens durch ein Sieb ausgetragen wird. Um Anbackungen und Verstopfungen des Siebes zu vermeiden, wird im Bereich des Bodens ein Fluid, beispielsweise in Form von Luft, zugesetzt. Eine vergleichbare Turm-Reib-Mühle ist aus der JP 2003 181 316 A bekannt. Die im Bodenbereich befindlichen Sieblöcher bzw. Siebspalten können durch verschlissene oder zerbrochene Mahlkörper verstopft werden. Dies führt wiederum zu einem erhöhten Verschleiß, was schließlich auch zu einer Beschädigung der unteren Enden der Schnecken-Stege führen kann. Ein weiterer Nachteil besteht darin, dass gut fließendes Mahlgut, wie beispielsweise trockener Quarzsand, sehr schnell durch die Mahlkörperpackung hindurch fließt und somit keinem kontrollierten Mahlprozess unterworfen wird.From the DE 42 02 101 A1 is a tower grate mill known in which the ground material is introduced from above into the grinding container and discharged in the region of the bottom through a sieve. In order to avoid caking and clogging of the screen, a fluid, for example in the form of air, is added in the region of the bottom. A comparable tower friction mill is from the JP 2003 181 316 A known. The sieve holes or sieve gaps in the bottom area can become clogged by worn or broken grinding media. This in turn leads to increased wear, which can eventually lead to damage to the lower ends of the screw webs. Another disadvantage is that well-flowing ground material, such as dry quartz sand, flows very quickly through the Mahlkörperpackung and thus is not subjected to a controlled grinding process.

Um die vorgenannten Nachteile zu vermeiden, ist es aus der JP 2005 246 204 A bekannt, die gesamte Packung aus Mahlkörpern zusammen mit dem zerkleinerten Mahlgut über einen im Bodenbereich angeordneten Schneckenförderer aus dem Mahlbehälter abzuziehen. Bei dieser bekannten Ausgestaltung muss die Mahlkörper-Mahlgut-Mischung außerhalb des Mahlbehälters, beispielsweise durch Sieben, voneinander getrennt werden. Die Mahlkörper müssen zusammen mit dem neuen Mahlgut wieder zugeführt werden. Dies führt zu einem erheblichen apparativen Aufwand.To avoid the aforementioned disadvantages, it is from the JP 2005 246 204 A it is known to withdraw the entire package of grinding media together with the comminuted material to be ground from the grinding container via a screw conveyor arranged in the bottom area. In this known embodiment, the grinding media-millbase mixture outside the grinding container, for example by sieving, to be separated from each other. The grinding media must be returned together with the new regrind. This leads to a considerable expenditure on equipment.

Weiterhin ist es aus der DD 268 892 A1 bekannt, in einer Turm-Reib-Mühle das Mahlgut mittels im Bodenbereich zugeführter Druckluft nach oben heraus zu blasen oder am oberen Ende des offenen Mahlbehälters über eine kreisförmige, ebene Überlaufkante auszutragen. Nachteilig hieran ist, dass im Betrieb keine kompakte Packung aus Mahlkörpern mit direktem Mahlgut-Mahlkörper-Kontakt entsteht, da die Mahlkörper im trockenen Mahlgut schwimmen. Ebenfalls können Mahlkörper über die Überlaufkante ausgetragen werden.Furthermore, it is from the DD 268 892 A1 It is known to blow up the material to be ground in a tower friction mill by means of compressed air supplied in the bottom area or to discharge it at the upper end of the open grinding container via a circular, planar overflow edge. The disadvantage of this is that in operation no compact packing of grinding media with direct grinding material-Mahlkörper-contact arises because the grinding media in the dry Ground material to float. Likewise, grinding media can be discharged via the overflow edge.

Aus der DE 15 07 653 A1 ist eine Rührwerksmühle zum Mahlen und Dispergieren von Feststoffteilen in flüssigen Medien bekannt, die in einem vertikalen, geschlossenen, zylindrischen Mahlbehälter einen mittig angeordneten Schnecken-Förderer aufweist. Der obere Bereich des Mahlraums ist durch ein zylindrisches Sieb begrenzt. Eine Mahlkörper-Packung erstreckt sich bis in dieses Sieb hinein. Am unteren Ende des Mahlraums ist ein Mahlgut-Einlass vorgesehen. Ein Mahlgut-Auslass umgibt das zylindrische Sieb. Das Mahlgut wird durch die Mahlkörper-Packung nach oben gefördert und hierbei zerkleinert und dispergiert. Dies geschieht durch die Relativbewegung der Mahlkörper gegeneinander, die durch den Schnecken-Förderer verursacht wird.From the DE 15 07 653 A1 discloses an agitating mill for grinding and dispersing solid particles in liquid media having a centrally located screw conveyor in a vertical, closed cylindrical milling vessel. The upper region of the grinding chamber is delimited by a cylindrical sieve. A media package extends into this screen. At the lower end of the grinding chamber a regrind inlet is provided. A regrind outlet surrounds the cylindrical screen. The millbase is conveyed upwards by the grinding media packing and hereby comminuted and dispersed. This is done by the relative movement of the grinding media against each other, which is caused by the screw conveyor.

Aus der DE 12 42 078 B ist eine ganz ähnliche Rührwerksmühle bekannt, bei der das als Schnecken-Förderer ausgebildete Rührwerk Mahlkörper im Außenbereich des Mahlraums nach oben und im Bereich des Schnecken-förderers nach unten fördert.From the DE 12 42 078 B a quite similar agitator mill is known in which the agitator designed as a screw conveyor promotes grinding media in the outer region of the grinding chamber upwards and in the region of the screw conveyor downwards.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren der gattungsgemäßen Art und eine Turm-Reib-Mühle der gattungsgemäßen Art zu schaffen, bei denen ein kontinuierlicher Trocken-Mahl-Betrieb bei gleichzeitigem Verbleib der Packung aus Mahlkörpern im Mahlbehälter möglich ist und bei denen auch der Einsatz relativ kleiner Mahlkörper und eine hohe Feinheit des gemahlenen Mahlgutes erreicht wird.The invention has for its object to provide a method of the generic type and a tower grate mill of the generic type, in which a continuous dry grinding operation while maintaining the packing of grinding media in the grinding container is possible and in which the Use of relatively small grinding media and a high fineness of the ground material to be ground is achieved.

Diese Aufgabe wird erfindungsgemäß bei einem Verfahren der gattungsgemäßen Art durch die Merkmale im Kennzeichnungsteil des Anspruches 1 gelöst. Die Packung aus Mahlkörpern ist während des gesamten Mahlprozesses dicht, da sie nicht von unten, beispielsweise durch Gas, aufgelockert wird. Die Mahlkörper werden in dem von mindestens einem Schnecken-Steg überdeckten Bereich nach oben gefördert und fließen dementsprechend in dem nicht vom Schnecken-Steg überdeckten ringförmigen, außen vom Mahlbehälter begrenzten Bereich nach unten. Das Mahlgut wird also mindestens einmal vollständig durch die Mahlkörper-Packung von oben nach unten und einmal von unten nach oben gefördert und dabei einem Mahl-Prozess unterworfen. Durch die Förderwirkung des Schnecken-Steges im Bereich der Antriebs-Welle wird die Mahlkörper-Packung im Innenbereich des Mahlbehälters angehoben und bildet eine etwa kegelstumpfförmige, nach außen abfallende Oberfläche, über die die Mahlkörper nach außen rollen. Sie drücken hierbei das auf der Oberfläche oder in der Oberfläche befindliche Mahlgut durch den Mahlgut-Auslass aus dem Mahlbehälter heraus, wobei dies noch in erheblichem Maße durch den GasStrom unterstützt wird. Vorteilhafte Ausgestaltungen des Verfahrens ergeben sich aus den Ansprüchen 2 bis 9.This object is achieved in a method of the generic type by the features in the characterizing part of the claim 1 solved. The packing of grinding media is dense during the entire grinding process, as it is not loosened from below, for example by gas. The grinding bodies are conveyed upwards in the area covered by at least one screw land and accordingly flow downwards in the area not covered by the screw land, which is bounded externally by the grinding tank. The millbase is thus at least once fully funded by the grinding media package from top to bottom and once from bottom to top and thereby subjected to a grinding process. Due to the conveying effect of the worm web in the region of the drive shaft, the media package is raised in the interior of the grinding container and forms an approximately frusto-conical, sloping outward surface, over which the grinding media roll to the outside. In this case, they press out the grinding stock on the surface or in the surface through the grinding stock outlet from the grinding container, whereby this is still supported to a considerable extent by the gas flow. Advantageous embodiments of the method will become apparent from the claims 2 to 9.

Die der Erfindung zugrunde liegende Aufgabe wird weiterhin bei der Turm-Reib-Mühle nach dem Anspruch 10 gelöst. Auch hier ergeben sich vorteilhafte Ausgestaltungen aus den Ansprüchen 11 bis 15.The object underlying the invention is further achieved in the tower friction mill according to claim 10. Again, advantageous embodiments result from the claims 11 to 15.

Weitere Merkmale, Vorteile und Einzelheiten der Erfindung ergeben sich aus der nachfolgenden Beschreibung von Ausführungsbeispielen anhand der Zeichnung. Es zeigt

Fig. 1
eine schematische Darstellung einer Turm-Reib-Mühle mit Rotationsströmung eines Gas-Stroms,
Fig. 2
einen gegenüber Fig. 1 abgewandelten Mahlbehälter einer Turm-Reib-Mühle mit Zuführung eines Gas-Stroms diametral zum Mahlgut-Auslass,
Fig. 3
eine dritte Ausführungsform eines Mahlbehälters einer Turm-Reib-Mühle mit Vertikalzuführung eines Gas-Stroms,
Fig. 4
einen Horizontal-Teil-Schnitt durch ein Sieb im Mahlgut-Auslass und
Fig. 5
eine Draufsicht auf das Sieb gemäß dem Sichtpfeil V in Fig. 4.
Further features, advantages and details of the invention will become apparent from the following description of exemplary embodiments with reference to the drawing. It shows
Fig. 1
1 is a schematic representation of a tower friction mill with rotational flow of a gas stream,
Fig. 2
one opposite Fig. 1 Modified grinding container of a tower friction mill with supply of a gas flow diametrically to the regrind outlet,
Fig. 3
a third embodiment of a grinding container of a tower grinder mill with vertical supply of a gas stream,
Fig. 4
a horizontal section through a sieve in the regrind outlet and
Fig. 5
a plan view of the sieve according to the viewing arrow V in Fig. 4 ,

Die in der Zeichnung dargestellte Turm-Reib-Mühle weist einen oben geschlossenen, zylindrischen Mahlbehälter 1 auf, für dessen Innendurchmesser D gilt: 0,4 m ≤ D ≤ 4,0 m. Im Mahlbehälter 1 ist als Mahlkörper-Umwälz-Einrichtung ein Schnecken-Förderer 2 angeordnet, der koaxial zur senkrechten Mittel-Achse 3 des Mahlbehälters 1 angeordnet ist. Der Schnecken-Förderer 2 weist eine koaxial zur Mittel-Achse 3 angeordnete Antriebs-Welle 4 mit einem Durchmesser di auf, auf der zwei zueinander parallele Schnecken-Stege 5 mit einer Steigung s und einem Außendurchmesser da und einem oberen Ende 6 befestigt sind. Die Welle 4 ist mittels eines Elektro-Motors 7 in einer Drehrichtung 8 drehantreibbar. Der Schnecken-Förderer 4 erstreckt sich nach unten bis in die unmittelbare Nähe des Bodens 9 des Mahlbehälters 1. Die Schnecken-Stege 5 erstrecken sich aus dieser Nachbarschaft zum Boden 9 über eine Höhe hs. Die Turm-Reib-Mühle ist sehr schlank ausgebildet. Für das Verhältnis der Schneckenhöhe hs zum Durchmesser D des Mahlbehälters 1 gilt: 1,5 ≤ hs/D ≤ 3.The tower grate mill shown in the drawing has a closed top, cylindrical grinding container 1, for whose inner diameter D applies: 0.4 m ≤ D ≤ 4.0 m. In the grinding container 1, a screw conveyor 2 is arranged as a grinding-body circulation device, which is arranged coaxially to the vertical center axis 3 of the grinding container 1. Of the Screw conveyor 2 has a coaxial with the central axis 3 arranged drive shaft 4 with a diameter di on which two mutually parallel screw webs 5 with a slope s and an outer diameter da and an upper end 6 are attached. The shaft 4 is rotationally driven by means of an electric motor 7 in a rotational direction 8. The screw conveyor 4 extends down to the immediate vicinity of the bottom 9 of the grinding container 1. The screw-webs 5 extend from this neighborhood to the bottom 9 over a height hs. The tower grinder mill is very slim. For the ratio of the screw height hs to the diameter D of the grinding container 1, 1.5 ≦ hs / D ≦ 3.

In der Nähe des Bodens 9 des Mahlbehälters 1 ist in letzterem ein während des Betriebes verschlossener Mahlkörper-Auslass 10 vorgesehen. Etwa in der Höhe des oberen Endes 6 der Schnecken-Stege 5 ist am Mahlbehälter 1 ein Mahlgut-Auslass 11 ausgebildet, an den sich eine Mahlgut-Abförder-Leitung 12 anschließt.In the vicinity of the bottom 9 of the grinding container 1 in the latter a closed during operation Mahlkörper outlet 10 is provided. Approximately at the height of the upper end 6 of the screw webs 5, a grinding stock outlet 11 is formed on the grinding container 1, to which a grinding stock removal line 12 connects.

In der Auslass-Öffnung 13 des Mahlgut-Auslasses 11 ist eine Mahlkörper-Rückhalte-Einrichtung in Form eines Spalt-Siebes 14 angeordnet, das in den Fig. 4 und 5 dargestellt ist. Es weist zwischen sich etwa parallel zur Mittel-Achse 3 erstreckenden Stegen 15 Spalte 16 auf, die sich - wie aus Fig. 4 ersichtlich ist - radial zur Achse 3 nach außen erweitern und die sich weiterhin von unten nach oben erweitern, wie aus Fig. 5 ersichtlich. Zumindest im unteren Bereich ist ihre Weite w kleiner als der Durchmesser d 17 der kleinsten eingesetzten Mahlkörper 17.In the outlet opening 13 of the grinding stock outlet 11, a grinding media retention device in the form of a gap-sieve 14 is arranged, which in the 4 and 5 is shown. It has between approximately parallel to the central axis 3 extending webs 15 column 16, which - as out Fig. 4 can be seen - extend radially to the axis 3 to the outside and continue to expand from bottom to top, as from Fig. 5 seen. At least in the lower region, its width w is smaller than the diameter d 17 of the smallest grinding media 17 used.

Die Auslass-Öffnung 13 hat eine Höhe h13. Die Schnecken-Stege 5 erstrecken sich von 0,1 h 13 bis 0,5 h 13 über die Unterkante 18 der Auslass-Öffnung 13, d. h. ihr oberes Ende 6 befindet sich in dieser Höhe über der Unterkante 18. Die von den Schnecken-Stegen 5 überstrichene Querschnittsfläche ist (da2 - di2) x π/4. Die freie ringförmige Querschnittsfläche zwischen den Schnecken-Stegen 5 und dem Mahlbehälter beträgt (D2 - da2) x π/4. Die freie Querschnittsfläche zwischen den Schnecken-Stegen 5 und dem Mahlbehälter 1 soll größer oder höchstens gleich dem von den Schnecken-Stegen 5 überstrichenen ringförmigen Querschnitt sein. Es gilt also: (D2 - da2) ≥ (da2 - di2). The outlet opening 13 has a height h13. The worm webs 5 extend from 0.1 h 13 to 0.5 h 13 over the lower edge 18 of the outlet opening 13, ie its upper end 6 is located at this height above the Bottom edge 18. The cross-sectional area swept by the screw lands 5 is (da 2 - di 2 ) x π / 4. The free annular cross-sectional area between the worm webs 5 and the grinding container is (D 2 - da 2 ) x π / 4. The free cross-sectional area between the worm webs 5 and the grinding container 1 should be greater than or at most equal to the swept by the worm webs 5 annular cross-section. The following applies: (D 2 - da 2 ) ≥ (da 2 - di 2 ) .

Bei der Ausführung nach Fig. 1 mündet diametral gegenüber dem Mahlgut-Auslass 11 ein Mahlgut-Einlass 19 in den Mahlbehälter 1 ein. Er ist oberhalb des oberen Endes 6 der Schnecken-Stege 5 angeordnet, und zwar etwa beginnend oberhalb der Oberkante 20 der Auslass-Öffnung 13. Dem Mahlgut-Einlass 19 ist eine Mahlgut-Zuführ-Leitung 21 vorgeordnet, in die Mahlgut 22 über eine gasdichte Dosier-Einrichtung 23, beispielsweise eine Zellenradschleuse, zugeführt wird.In the execution after Fig. 1 opens a Mahlgut inlet 19 diametrically opposite the Mahlgut-outlet 11 in the grinding container 1 a. It is arranged above the upper end 6 of the worm webs 5, specifically starting above the upper edge 20 of the outlet opening 13. The grinding stock inlet 19 is preceded by a grinding material feed line 21 into which the grinding material 22 is gas-tight Dosing device 23, for example, a rotary valve, is supplied.

Oberhalb der Auslass-Öffnung 13, und zwar auch oberhalb des Mahlgut-Einlasses 19, ist auf der Seite der Auslass-Öffnung 13 ein zur Atmosphäre hin offener Gas-Einlass 24, im konkreten Fall also ein Luft-Einlass, vorgesehen.Above the outlet opening 13, and also above the grinding stock inlet 19, on the side of the outlet opening 13, a gas inlet 24 open to the atmosphere, in this case an air inlet, is provided.

Die Mahlgut-Abförder-Leitung 12 ist an ein Saug-Gebläse 25 angeschlossen, und zwar unter Zwischenschaltung eines Wind-Sichters 26, beispielsweise eines üblichen Zyklon-Abscheiders, und eines diesem nachgeordneten Staub-Filter-Abscheiders 27. In dem Abscheider 27 ist ein Filter 28 vorgesehen. Er ist unten an eine gasdichte Schleuse 29, beispielsweise eine Zellenradschleuse, angeschlossen. Aus dem Wind-Sichter 26 wird grobes Mahlgut über eine Rückführ-Leitung 30 der Dosier-Einrichtung 23 und damit dem Mahlgut-Einlass 19 erneut zugeführt. Das aus dem Abscheider 27 ausgetragene Mahlgut hat die gewünschte Feinheit.The regrind discharge line 12 is connected to a suction fan 25, with the interposition of a wind sifter 26, for example, a conventional cyclone separator, and a downstream of this dust filter separator 27. In the separator 27 is a Filter 28 is provided. It is connected to the bottom of a gas-tight lock 29, such as a rotary valve. From the wind sifter 26 is coarse material to be ground via a return line 30 of the metering device 23 and thus fed to the grinding stock inlet 19 again. The millbase discharged from the separator 27 has the desired fineness.

In dem Mahlbehälter 1 ist ein Druckgeber 31 angeordnet. Gleichermaßen ist in der Mahlgut-Abförder-Leitung 12 verhältnismäßig dicht hinter dem Mahlgut-Auslass 11 ein weiterer Druckgeber 32 angeordnet. Deren Druckmesswerte werden auf ein Differenz-Druck-Messgerät 33 zur Ermittlung der Druckdifferenz zwischen den beiden gemessenen Werten gegeben. In der Leitung 12 ist zwischen dem Abscheider 27 und dem Gebläse 25 ein Gas-Volumen-Messgerät 34 angeordnet. Außerdem mündet in die Mahlgut-Abförder-Leitung 12 in der Nähe des Mahlgut-Auslasses 11 eine Zusatz-Gas-Leitung 35 ein, die über ein steuerbares Ventil 36 geöffnet oder geschlossen werden kann. Hierüber kann Zusatz-Gas in die Leitung 12 eingeführt werden, wenn der aus dem Mahlbehälter 1 kommende Gas-Volumenstrom nicht ausreichend ist, um das Mahlgut abzufördern. Auch in diese Leitung 35 ist ein Gas-Volumenstrom-Messgerät 37 eingefügt.In the grinding container 1, a pressure transducer 31 is arranged. Similarly, in the regrind discharge line 12 relatively close behind the grinding stock outlet 11, a further pressure transducer 32 is arranged. Their pressure readings are applied to a differential pressure gauge 33 for determining the pressure difference between the two measured values. In line 12, a gas volume meter 34 is disposed between the separator 27 and the blower 25. Furthermore, an additional gas line 35, which can be opened or closed via a controllable valve 36, opens into the grinding stock removal line 12 in the vicinity of the grinding stock outlet 11. About this additional gas can be introduced into the conduit 12 when the gas volume flow coming from the grinding container 1 is not sufficient to remove the ground material. Also in this line 35, a gas flow meter 37 is inserted.

Die Betriebsweise ist wie folgt:The operation is as follows:

Vor Inbetriebnahme wird der Mahlbehälter 1 mit Mahlkörpern 17 gefüllt, und zwar bis zu einer Höhe, die 80% bis 95% der Höhe des Mahlbehälters 1 bis zum oberen Ende 6 der Schnecken-Stege 5 bis knapp oberhalb der Unterkante 18 der Auslass-Öffnung 13 beträgt. Anschließend wird der Motor 7 in Betrieb gesetzt, so dass die Welle 4 mit den Schnecken-Stegen 5 in Drehrichtung 8 in Betrieb gesetzt wird. Entsprechend der Steigung der Schnecken-Stege 5 werden die Mahlkörper 17, die sich in dem von den Schnecken-Stegen 5 überstrichenen ringförmigen Querschnitts-Bereich des Mahlbehälters 1 befinden, nach oben gefördert. Damit dieser Fördereffekt zuverlässig eintritt, gilt für die Steigung s der Schnecken-Stege 5 im Verhältnis zum Außendurchmesser da der Schnecken-Stege 5 0,5 da ≤ s ≤ 1,5 da und bevorzugt 0,8 da ≤ s ≤ 1,2 da. Weiterhin gilt, dass die Welle 4 mit den Schnecken-Stegen 5 mit einer derartigen Drehzahl angetrieben wird, dass die Schnecken-Stege 5 eine Außen-Umfangs-Geschwindigkeit von 2,0 bis 4,0 m/sec und bevorzugt zwischen 2,2 und 3,0 m/sec aufweisen. Für den Durchmesser d17 der Mahlkörper 17 gilt hierbei: 10 mm ≤ d17 ≤ 30 mm und bevorzugt 15 mm ≤ d17 ≤ 25 mm.Before commissioning the grinding container 1 is filled with grinding media 17, up to a height which is 80% to 95% of the height of the grinding container 1 to the upper end 6 of the screw webs 5 to just above the lower edge 18 of the outlet opening thirteenth is. Subsequently, the motor 7 is set in operation, so that the shaft 4 is set with the worm webs 5 in the direction of rotation 8 in operation. Corresponding to the pitch of the worm webs 5, the grinding bodies 17, which are located in the annular cross-sectional area of the grinding container 1 swept by the worm webs 5, are conveyed upwards. In order for this conveying effect to occur reliably, the worm webs 5 are in proportion to the pitch s to the outer diameter da screw flights 5 0.5 da ≤ s ≤ 1.5 da and preferably 0.8 da ≤ s ≤ 1.2 da. Furthermore, the shaft 4 is driven with the worm webs 5 at such a speed that the worm webs 5 an outer peripheral speed of 2.0 to 4.0 m / sec and preferably between 2.2 and 3.0 m / sec. For the diameter d17 of the grinding bodies 17, the following applies: 10 mm ≦ d17 ≦ 30 mm and preferably 15 mm ≦ d17 ≦ 25 mm.

Mit Beginn des Drehantriebs des Schnecken-Förderers 2 wird zu zerkleinerndes Mahlgut über die gasdichte Dosier-Einrichtung 23 in den Mahlbehälter 1 eingegeben. Das zugeführte Mahlgut 22 hat in der Regel eine Korngröße, die kleiner ist als 0,25 d17 des Durchmessers d17 der Mahlkörper 17 und bevorzugt kleiner als 0,2 d17. Da die Mahlkörper 17 im Bereich der Schnecken-Stege 5 nach oben gefördert werden, sinken sie in dem äußeren nicht von den Schnecken-Stegen 5 überstrichenen Bereich nach unten, wie es durch die Umlauf Fließ-Pfeile 38 in Fig. 1 angedeutet ist. Das im Bereich der Behälterwand eingegebene Mahlgut fließt mit den Mahlkörpern 17 nach unten und wird zwischen diesen zerrieben. Anschlie-βend wird es unter weiterer Zerkleinerung mit den Mahlkörpern 17 im Bereich der Schnecken-Stege 5 wieder nach oben gefördert. Wie weiterhin aus der Zeichnung hervorgeht, werden die Mahlkörper 17 im Bereich der Schnecken-Stege 5, also unmittelbar benachbart zur Welle 4, soweit über die Enden 6 der Schnecken-Stege 5 angehoben, dass die Packung aus Mahlkörpern 17 mit Mahlgut 22 etwa eine kegelstumpfförmige Oberfläche 39 erhält. Die Mahlkörper 17 befinden sich nur geringfügig, und zwar bis 0,3 h 13, oberhalb der Unterkante 18 der Auslass-Öffnung 13 bzw. des Siebes 14. Andererseits befindet sich Mahlgut 22, das radial nach außen aus der Packung aus Mahlkörpern 17 herausquillt, direkt vor dem Sieb 14. Während dieses Mahlvorgangs wird durch das Gebläse 25 Luft von außen durch den Gas-Einlass 24 eingesaugt und strömt entsprechend dem Umlenk-Pfeil 40 um die Welle 4 herum und über die Oberfläche 39 der Mahlkörperpackung. Wenn der Gas-Einlass 24 überwiegend orthogonal, also im Wesentlichen auf die Achse 3 gerichtet ist, dann erfolgt nur eine einfache Umlenkung um 180° der Luft um die Welle 4. Wenn dagegen der Gas-Einlass 24 überwiegend tangential angeordnet ist, dann bildet sich eine Rotations-Strömung aus. Die gemäß dem Umlenk-Pfeil 40 durch den Mahlbehälter 1 geförderte Luft nimmt besonders feines Mahlgut 22, das durch den Mahlgut-Einlass 19 zugeführt wird, direkt mit und trägt es direkt aus. Der Gasstrom tritt durch das Sieb 14 in die Mahlgut-Abförder-Leitung 12 ein. Der geschilderte Gasstrom drückt hierbei das im Mahlbehälter 1 vor dem Sieb 14 befindliche Mahlgut 22 in die Leitung 12. Soweit Mahlkörper 17 vor das Sieb 14 gelangen, werden sie durch dieses zurückgehalten. Grundsätzlich wird das gesamte Mahlgut 22 nach einem geschilderten Umlauf ausgetragen. Im Wind-Sichter 26 wird das grobe noch nicht ausreichend zerkleinerte Mahlgut 22 abgeschieden und durch die Rückführ-Leitung 30 und über die Dosier-Einrichtung 23 erneut dem Mahlprozess zugeführt. Die Förderluft tritt zusammen mit dem fein gemahlenen Mahlgut 22 in den Staub-Filter-Abscheider 27 ein, wo das fein gemahlene Mahlgut am Filter 28 abgeschieden wird und über die Schleuse 29 ausgetragen wird. Die vom Mahlgut 22 befreite Luft wird durch das Gebläse 25 abgefördert.With the beginning of the rotary drive of the screw conveyor 2 to be comminuted millbase is entered via the gas-tight metering device 23 into the grinding container 1. The supplied millbase 22 generally has a particle size which is smaller than 0.25 d17 of the diameter d17 of the grinding bodies 17 and preferably less than 0.2 d17. Since the grinding media 17 are conveyed upwards in the region of the screw flights 5, they sink downwards in the outer region not swept by the screw flights 5, as indicated by the circulation flow arrows 38 in FIG Fig. 1 is indicated. The millbase fed in the area of the container wall flows downwards with the grinding bodies 17 and is crushed between them. Connecting βend it is promoted again with further comminution with the grinding media 17 in the area of the screw webs 5 upwards. As further apparent from the drawing, the grinding media 17 in the area of the screw webs 5, so immediately adjacent to the shaft 4, so far raised over the ends 6 of the screw webs 5, that the packing of grinding media 17 with ground material 22 about a frusto-conical Surface 39 receives. The grinding media 17 are only slightly, up to 0.3 h 13, above the lower edge 18 of the outlet opening 13 and the screen 14. On the other hand, there is regrind 22, which swells radially outward from the packing of grinding media 17, directly in front of the sieve 14. During this milling process, air is sucked in from outside through the gas inlet 24 by the blower 25 and flows around the shaft 4 in accordance with the deflection arrow 40 and over the surface 39 of the grinding-body packing. If the gas inlet 24 is predominantly orthogonal, ie substantially directed to the axis 3, then only a simple deflection by 180 ° of the air around the shaft 4. If, however, the gas inlet 24 is arranged predominantly tangentially, then forms a rotational flow out. The conveyed according to the deflection arrow 40 through the grinding container 1 air takes very fine ground material 22, which is fed through the Mahlgut inlet 19, directly with and carries it directly. The gas stream enters the regrind discharge line 12 through the sieve 14. The described gas flow in this case pushes the grinding material 22 located in the grinding container 1 in front of the sieve 14 into the line 12. As far as grinding bodies 17 reach the sieve 14, they are retained by this. Basically, the entire material to be ground 22 is discharged after a described circulation. In the wind sifter 26, the coarse grinding stock 22 which has not yet been sufficiently comminuted is separated off and returned to the grinding process by the return line 30 and via the metering device 23. The conveying air enters together with the finely ground material to be ground 22 in the dust filter 27, where the finely ground material is deposited on the filter 28 and discharged through the lock 29. The freed from the material to be ground 22 air is discharged through the blower 25.

Wenn die durch den Mahlbehälter 1 zugeführte und über den Mahlgut-Auslass 11 abgeförderte Luft nicht ausreicht, um den geschilderten Abförder-Prozess durchzuführen, dann kann über die Zusatz-Gas-Leitung 35 der Förder-Luft zusätzlich noch Luft zugesetzt werden.If the supplied through the grinding container 1 and discharged via the Mahlgut outlet 11 is not sufficient air to perform the described Abförder process, then the air additionally can be added via the additional gas line 35 of the conveying air.

Die Ausgestaltung der eigentlichen Turm-Reib-Mühle nach Fig. 2 unterscheidet sich von der nach Fig. 1 durch die Anordnung des Gas-Einlasses 24'. Dieser befindet sich gegenüber dem Mahlgut-Auslass 11 oberhalb des Mahlgut-Einlasses 19. Der Luft-Strom umströmt hierbei entsprechend dem Strömungs-Pfeil 41 die Welle 4 und dann - wie bei der Ausführung nach Fig. 1 über die Oberfläche 39 der Mahlgut-Mahlkörper-Packung und drückt das gemahlene Mahlgut 22 durch das Sieb 14 in die Mahlgut-Abförder-Leitung 12. Damit der Luft-Strom nicht bereits das durch den Mahlgut-Einlass 19 eintretende Mahlgut 22 direkt zum Sieb 14 fördert, ist der Gas-Einlass 24' in Richtung zur Welle 4 hin in den Mahlbehälter 1 hineinverlegt, so dass das durch den Mahlgut-Einlass 19 eintretende Mahlgut 22 direkt an der Innenwand des Mahlbehälters 1 herab in die Mahlkörper-Packung fließen kann.The design of the actual tower friction mill after Fig. 2 is different from the after Fig. 1 by the arrangement of the gas inlet 24 '. This is located opposite the regrind outlet 11 above the millbase inlet 19. The air flow flows around here corresponding to the flow arrow 41, the shaft 4 and then - as in the embodiment according to Fig. 1 over the surface 39 of the grinding material-Mahlkörper-packing and presses the ground material 22 through the sieve 14 in the Mahlgut-discharge line 12. So that the air flow is not already entering the Mahlgut inlet 19 Mahlgut 22 directly to the sieve 14th promotes, the gas inlet 24 'in the direction of the shaft 4 is moved into the grinding container 1, so that the entering through the Mahlgut inlet 19 Mahlgut 22 can flow directly to the inner wall of the grinding container 1 down into the grinding media package.

Die Ausgestaltung nach Fig. 3 unterscheidet sich von den beiden zuvor dargestellten dadurch, dass der Gasstrom nicht mittels eines Saug-Gebläses angesaugt wird. Vielmehr ist ein Druck-Gebläse 42 vorgesehen, das Gas mit einem beliebigen vorgebbaren Druck durch einen Gas-Einlass 24" von oben in den Mahlbehälter 1 hineindrückt. Das Gas strömt entsprechend dem Strömungs-Pfeil 43 von oben durch den Mahlbehälter 1 und dann über die Oberfläche 39 zum Mahlgut-Auslass 11 und drückt in der bereits geschilderten Weise das Mahlgut 22 durch das Sieb 14.The design after Fig. 3 differs from the two previously illustrated in that the gas flow is not sucked by means of a suction fan. Rather, a pressure blower 42 is provided, which pushes gas with an arbitrary predeterminable pressure through a gas inlet 24 "from above into the grinding container 1. The gas flows according to the flow arrow 43 from above through the grinding container 1 and then over the Surface 39 to the grinding stock outlet 11 and presses in the manner already described, the material to be ground 22 through the sieve 14th

Während bei den Ausführungen nach den Fig. 1 und 2 aufgrund des Einsatzes eines Saug-Gebläses 25 insgesamt ein Förderdruck von weniger als 1 bar erreicht werden kann, kann durch Einsatz eines Druck-Gebläses 42 ein im Grundsatz beliebiger Druck eingestellt werden. Damit das entsprechend dem Strömungs-Pfeil 43 in den Mahlbehälter 1 nach Fig. 3 einströmende Gas nicht das durch den Mahlgut-Einlass 19 eintretende Mahlgut 22 mitnimmt oder oberhalb der Mahlkörper-Packung verwirbelt, ist der Mahlgut-Einlass 19 mittels eines Leitblechs 44 so abgedeckt, dass der Mahlgut-Eintritt nicht durch den Gasstrom beeinträchtigt wird. Selbstverständlich kann ein solches Leitblech 44 zur Abdeckung des Mahlgut-Einlasses 19 bei den Ausführungen nach den Fig. 1 und 2 bei Bedarf eingesetzt werden.While in the versions after the Fig. 1 and 2 due to the use of a suction fan 25 total delivery pressure of less than 1 bar can be achieved, by using a pressure fan 42 in principle any pressure can be adjusted. So that according to the flow arrow 43 in the grinding container 1 after Fig. 3 inflowing gas does not pass through the grinding stock inlet 19 regrind 22nd entrains or swirled above the media package, the Mahlgut inlet 19 is covered by a guide plate 44 so that the Mahlgut-entry is not affected by the gas flow. Of course, such a guide plate 44 to cover the grinding stock inlet 19 in the embodiments of the Fig. 1 and 2 be used if necessary.

Bei dieser Ausführungsform ist der Mahlkörper-Auslass 10' im Boden 9 des Mahlbehälters 1 vorgesehen, wodurch die Entnahme der Mahlkörper 17 aus dem Mahlbehälter 1 erleichtert werden kann.In this embodiment, the grinding media outlet 10 'is provided in the bottom 9 of the grinding container 1, whereby the removal of the grinding media 17 from the grinding container 1 can be facilitated.

Über das Differenz-Druck-Messgerät 33 und alternativ oder kumulativ auch über das Gas-Volumen-Messgerät 34, 37 kann eine Fein-Steuerung des Gesamtprozesses erfolgen.Via the differential pressure measuring device 33 and alternatively or cumulatively also via the gas volume measuring device 34, 37, a fine control of the overall process can take place.

Im einfachsten Fall wird lediglich eine Differenz-Druck-Messung über das Messgerät 33 vorgenommen und der entsprechende Messwert auf eine zentrale Steuer-Einheit 45 gegeben. Wenn der gemessene Differenz-Druck einen vorgegebenen Sollwert überschreitet, kann dies ein Indiz dafür sein, dass das Sieb 14 teilweise oder ganz verstopft ist. In diesem Fall kann von der Steuer-Einheit 45 das Gebläse 25 oder das Gebläse 42 angesteuert werden, um den Haupt-Gas-Volumenstrom, der über den Gas-Einlass 24, 24' oder 24" zugeführt wird, zu erhöhen und/oder den über das Ventil 36 zugeführten Sekundär-Gas-Volumenstrom zu reduzieren. Ziel ist es dabei, in einem solchen Fall mehr Gas durch das Sieb 14 hindurchzusaugen bzw. hindurchzudrücken.In the simplest case, only a difference-pressure measurement is made via the measuring device 33 and the corresponding measured value is passed to a central control unit 45. If the measured differential pressure exceeds a predetermined setpoint, this may be an indication that the screen 14 is partially or completely clogged. In this case, the fan unit 25 or the blower 42 can be controlled by the control unit 45 in order to increase and / or the main gas volume flow, which is supplied via the gas inlet 24, 24 'or 24 " The aim is to suck in more gas through the sieve 14 in such a case.

Bei Einsatz der beiden Volumenstrom-Messgeräte 34, 37 wird für einen bestimmten vorgegebenen Betrieb ein Haupt-Gas-Volumenstrom über das Messgerät 34 eingestellt, der vom Gebläse 25 bzw. 42 gefördert werden soll. Der über die Zusatz-Gas-Leitung 35 zuzuführende Sekundär-Gas-Volumenstrom wird so eingestellt, dass ein vorgegebener Soll-Gas-Volumenstrom durch den Mahlbehälter 1 gefördert wird. Dieser durch den Mahlbehälter 1 geförderte Soll-Gas-Volumenstrom ergibt sich aus der Differenz des Haupt-Gas-Volumenstroms und des Sekundär-Gas-Volumenstroms. Wenn die Gas-Volumenströme ständig über die Messgeräte 34 und 37 gemessen werden, ergibt sich aus einem Anstieg des von dem Messgerät 37 erfassten Volumenstroms, dass das Sieb 14 teilweise oder ganz verstopft ist. In einem solchen Fall wird der vom Gebläse 25 bzw. 42 zu fördernde Gesamt-Gas-Volumenstrom erhöht. Gleichzeitig wird das Ventil 36 teilweise oder vollständig geschlossen, um auf diese Weise einen höheren Gas-Volumenstrom durch den Mahlbehälter 1 zu erreichen, und um somit das Sieb 14 freizublasen. Kumulativ kann hierbei auch die bereits geschilderte Differenz-Druck-Messung eingesetzt werden.When using the two volumetric flow meters 34, 37 is set for a given operation, a main gas flow rate through the meter 34, which are promoted by the fan 25 and 42, respectively should. The secondary gas volume flow to be supplied via the additional gas line 35 is adjusted so that a predetermined desired gas volume flow is conveyed through the grinding container 1. This funded by the grinding container 1 target gas flow rate results from the difference of the main gas volume flow and the secondary gas flow rate. If the gas volume flows are constantly measured via the measuring devices 34 and 37, it follows from an increase in the volume flow detected by the measuring device 37 that the screen 14 is partially or completely blocked. In such a case, the total gas volume flow to be delivered by the fan 25 or 42 is increased. At the same time, the valve 36 is partially or completely closed to achieve in this way a higher gas flow rate through the grinding container 1, and thus to blow the screen 14. Cumulatively, the already described differential pressure measurement can also be used.

Claims (15)

  1. Method for a continuous dry milling operation of a vertical grinding machine which comprises
    - a vertical, closed milling container (1);
    - a screw conveyor (2) which is arranged centrally in the milling container (1), the screw conveyor (2) comprising
    -- a drive shaft (4) with a central axis (3) and
    -- at least one screw flight (5) which is arranged on the drive shaft (4), extends along a height (hs) up to an upper end (6) and covers the cross-section of the milling container (1) only partially;
    - a package of grinding bodies (17), the package having an upper surface (39);
    - a grinding stock inlet (19) which projects into the milling container (1) above the package of grinding bodies (17);
    - a gas inlet (24, 24', 24") which projects into the milling container (1) for introducing gas;
    - a grinding stock outlet (11) which projects out of the milling container (1) and has a lower edge (18) and a height (h 13) for discharging grinding stock (22) and gas; and
    - a motor (7) for driving the screw conveyor (2) in a direction of rotation (8) where the at least one screw flight (5) conveys grinding bodies (17) upwards,
    characterized in
    - that the surface (39) of the package of grinding bodies (17) is adjusted in such a way when the screw conveyor (2) is driven for rotation that it obtains an approximately frustoconical shape which slopes radially outwards and ends radially outside in the region of the lower edge (18) of the grinding stock outlet (11);
    - that the gas is introduced into the milling container (1) above the package of grinding bodies (17); and
    - that gas and grinding stock (22) are discharged from the milling container (1) in the region of the surface (39) of the package of grinding bodies (17) through the grinding stock outlet (11).
  2. Method according to claim 1, characterized in that the grinding stock (22) is fed into the milling container (1) opposite to the grinding stock outlet (11).
  3. Method according to claim 1 or 2, characterized in that the gas is moved to the surface (39) of the package of grinding bodies (17) above the package of grinding bodies (17) and is deflected thereby.
  4. Method according to one of claims 1 to 3, characterized in that the gas is passed by the grinding stock inlet (19).
  5. Method according to claim 1 or 2, characterized in that the gas is introduced into the milling container (1) opposite to the grinding stock outlet (11).
  6. Method according to one of claims 1 to 6, characterized in that the gas is sucked out of the milling container (1).
  7. Method according to one of claims 1 to 5, characterized in that the gas is blown into the milling container under pressure.
  8. Method according to one of claims 1 to 7, characterized in that the screw conveyor (2) is driven such that the at least one screw flight (5) has a peripheral speed at its outer periphery of 2.0 to 4.0 m/sec, advantageously of 2.2 to 3.0 m/sec.
  9. Method according to claim 1, characterized in that the package of grinding bodies (17) is adjusted in such a way as to end at a maximum height (h13) of no more than 0.3 h13 above the lower edge (18) of the grinding stock outlet (11).
  10. Vertical grinding mill comprising
    - a vertical, closed milling container (1);
    - a screw conveyor (2) which is arranged centrally in the milling container (1), the screw conveyor (2) comprising
    -- a drive shaft (4) with a central axis (3) and
    -- at least one screw flight (5) which is arranged on the drive shaft (4), extends along a height (hs) up to an upper end (6) and covers the cross-section of the milling container (1) only partially;
    - a package of grinding bodies (17), the package having an upper surface (39);
    - a grinding stock inlet (19) which projects into the milling container (1) above the package of grinding bodies (17);
    - a gas inlet (24, 24', 24") which projects into the milling container (1) for introducing gas;
    - a grinding stock outlet (11) which projects out of the milling container (1) and has a lower edge (18) and a height (h 13) for discharging grinding stock (22) and gas; and
    - a motor (7) for driving the screw conveyor (2) in a direction of rotation (8) where the at least one screw flight (5) conveys grinding bodies (17) upwards,
    characterized in
    - that the grinding stock outlet (11) comprises an outlet opening (13) with a screen (14);
    - that the upper end (6) of the at least one screw flight (5) is arranged on a level with the screen (14); and
    - that the gas inlet (24, 24', 24") is arranged above the upper end (6) of the at least one screw flight (5).
  11. Vertical grinding mill according to claim 10, characterized in that the gas inlet (24) is arranged above the grinding stock outlet (11).
  12. Vertical grinding mill according to claim 10, characterized in that the gas inlet (24') is arranged opposite the grinding stock outlet (11) and above the grinding stock inlet (19).
  13. Vertical grinding mill according to claim 10, characterized in that the gas inlet (24") projects into the milling container (1) from above.
  14. Vertical grinding mill according to one of claims 10 to 13, characterized in
    that a gas baffle plate (44) is provided in front of the grinding stock inlet (19).
  15. Vertical grinding mill according to one of claims 10 to 14, characterized in
    that the screen (14) is a slotted-hole screen.
EP08700982.5A 2007-02-02 2008-01-04 Method for the continuous dry milling process of a vertical grinding mill and vertical grinding mill Not-in-force EP2125230B8 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL08700982T PL2125230T3 (en) 2007-02-02 2008-01-04 Method for the continuous dry milling process of a vertical grinding mill and vertical grinding mill

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102007005250A DE102007005250B3 (en) 2007-02-02 2007-02-02 Dry grinding method for continuous dry grinding in an abrasive tower grinder uses a closed vertical grinding container fitted with a worm feeder driven so as to rotate and feed grinding substances upwards
PCT/EP2008/000030 WO2008092542A1 (en) 2007-02-02 2008-01-04 Method for the continuous dry milling process of a vertical grinding mill and vertical grinding mill

Publications (3)

Publication Number Publication Date
EP2125230A1 EP2125230A1 (en) 2009-12-02
EP2125230B1 true EP2125230B1 (en) 2013-06-05
EP2125230B8 EP2125230B8 (en) 2013-07-17

Family

ID=38825521

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08700982.5A Not-in-force EP2125230B8 (en) 2007-02-02 2008-01-04 Method for the continuous dry milling process of a vertical grinding mill and vertical grinding mill

Country Status (17)

Country Link
US (2) US7971808B2 (en)
EP (1) EP2125230B8 (en)
JP (1) JP5358457B2 (en)
KR (1) KR101381488B1 (en)
CN (1) CN101600504B (en)
AU (1) AU2008210059B2 (en)
BR (1) BRPI0806627A2 (en)
CA (1) CA2677268C (en)
DE (1) DE102007005250B3 (en)
DK (1) DK2125230T3 (en)
ES (1) ES2424021T3 (en)
MX (1) MX2009007307A (en)
PL (1) PL2125230T3 (en)
RU (1) RU2453372C2 (en)
UA (1) UA97510C2 (en)
WO (1) WO2008092542A1 (en)
ZA (1) ZA200905382B (en)

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007005250B3 (en) * 2007-02-02 2008-01-17 Maschinenfabrik Gustav Eirich Gmbh & Co. Kg Dry grinding method for continuous dry grinding in an abrasive tower grinder uses a closed vertical grinding container fitted with a worm feeder driven so as to rotate and feed grinding substances upwards
CN101954305A (en) * 2010-09-25 2011-01-26 昆山密友粉碎设备有限公司 Dry stirring and grinding machine
EP2846917B1 (en) * 2012-05-10 2019-09-18 Belmonte Investments Limited Attritor mill and process for using it
DE102012013279A1 (en) * 2012-07-05 2014-01-09 Roland Nied Method for operating a stirred ball mill and agitator ball mill therefor
CN102728440B (en) * 2012-07-11 2014-04-16 北京萃宝重工科技有限公司 Efficient upright ball mill
US9764329B2 (en) * 2013-01-15 2017-09-19 Aaron Engineered Process Equipment, Inc. Rotary mill
EP2837424A1 (en) * 2013-08-13 2015-02-18 TARTECH eco industries AG Slag crusher
US9943853B2 (en) * 2014-01-16 2018-04-17 Michael Marshall Pulverizing apparatus and method of pulverizing rocks
US10058872B2 (en) 2014-07-03 2018-08-28 STT Enviro Corp. Vertical ball mill with internal materials flow conduit
DE102015200924A1 (en) * 2015-01-21 2016-07-21 Robert Bosch Gmbh Coaxial mill and feed unit for a mill
US10500591B2 (en) * 2015-09-02 2019-12-10 Air Products And Chemicals, Inc. System and method for the preparation of a feedstock
US10926269B2 (en) 2017-12-01 2021-02-23 Metso Minerals Industries, Inc. Vertical grinding mill, screw shaft, and method of designing and/or manufacturing a screw shaft
CN108816395A (en) * 2018-08-09 2018-11-16 洛阳矿山机械工程设计研究院有限责任公司 A kind of variable-pitch auger blender of vertical mixing mill
CN111135912A (en) * 2020-01-15 2020-05-12 厦门艾思欧标准砂有限公司 Energy-saving vertical grinding machine for dry grinding and shaping
CN111420780B (en) * 2020-01-15 2022-03-01 厦门艾思欧标准砂有限公司 Grinding and shaping method of vertical grinding machine
CN113019590B (en) * 2021-03-22 2022-11-08 厦门艾思欧标准砂有限公司 Energy-saving double-bearing vertical grinding machine for dry grinding and shaping
CN113019645B (en) * 2021-03-22 2022-09-09 江苏巨胜智能传动科技有限公司 Tortoise is bred with husky processing apparatus that lays eggs
CN115446320B (en) * 2022-09-06 2023-06-27 江苏威拉里新材料科技有限公司 Metal particle circulation grinding device and use method thereof

Family Cites Families (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1242078B (en) * 1962-06-13 1967-06-08 Spangenberg Maschf G Agitator mill for the continuous grinding and dispersing of substances in liquids
US3350280A (en) * 1963-10-31 1967-10-31 Standard Oil Co Retort for oil-bearing shales
DE1507653C3 (en) * 1966-06-10 1975-05-07 Gustav Spangenberg Maschinenfabrik Gmbh, 6800 Mannheim Device for the continuous grinding and dispersing of substances in liquids
JPS60155957U (en) * 1984-03-28 1985-10-17 日本タワ−ミル株式会社 Product discharge device of tower type grinding mill
JPS60161443U (en) * 1984-04-04 1985-10-26 日本タワ−ミル株式会社 Product sorting and discharge device of tower type grinding mill
DD268892A1 (en) * 1986-11-28 1989-06-14 Akad Wissenschaften Ddr DEVICE AND METHOD FOR FINE AND FINISHING
JPH043630Y2 (en) * 1987-01-23 1992-02-04
JPS63200849A (en) * 1987-02-16 1988-08-19 株式会社　井上製作所 Continuous type raw material fractionating method and device
KR900002381Y1 (en) * 1987-04-08 1990-03-26 구보다뎃고오 가부시기가이샤 Crusher
JPH01120949U (en) * 1988-02-09 1989-08-16
US5167375A (en) * 1988-04-04 1992-12-01 Datta Rabinder S Apparatus for mineral matter separation
JP2976481B2 (en) * 1989-05-10 1999-11-10 松下電器産業株式会社 Method for producing film-like graphite
JPH0389953A (en) * 1989-08-31 1991-04-15 Mitsui Miike Kakoki Kk Dry grinding method
AU626758B2 (en) * 1990-07-23 1992-08-06 Kubota Corporation Pulverizer
JPH0441733U (en) * 1990-08-09 1992-04-09
DE4202101A1 (en) * 1992-01-27 1993-07-29 Zementanlagen Und Maschinenbau Crushing mill for wet or dry material - has nozzles which direct air or water on material to prevent it from caking
AU656843B2 (en) * 1992-03-30 1995-02-16 Kubota Corporation Vertical pulverizer
JPH0585447U (en) * 1992-04-22 1993-11-19 三井三池化工機株式会社 Crusher
JP2566884Y2 (en) * 1992-05-27 1998-03-30 三井鉱山株式会社 Crusher
JPH07256133A (en) * 1994-03-25 1995-10-09 Kubota Corp Frictional crushing
JP3231538B2 (en) 1994-03-25 2001-11-26 株式会社クボタ Protection structure for the inner surface of the processing cylinder of a vertical media agitator and crusher
JP3239671B2 (en) * 1995-03-08 2001-12-17 松下電器産業株式会社 Film heaters, heated seats, evaporation boats and heating furnaces
JP2002333274A (en) * 2001-05-10 2002-11-22 Taikisha Ltd Hot air type drying apparatus and method for treating garbage using the same
JP2003181316A (en) * 2001-12-17 2003-07-02 Nippon Airitsuhi Kk Medium agitation and crushing device and crushing treatment system having the device
JP2005246204A (en) * 2004-03-03 2005-09-15 Kubota Construction Co Ltd Pulverizing method using ball for pulverization
JP2006154802A (en) * 2004-11-08 2006-06-15 Canon Inc Image heating device and heater for use therein
DE102007005250B3 (en) * 2007-02-02 2008-01-17 Maschinenfabrik Gustav Eirich Gmbh & Co. Kg Dry grinding method for continuous dry grinding in an abrasive tower grinder uses a closed vertical grinding container fitted with a worm feeder driven so as to rotate and feed grinding substances upwards

Also Published As

Publication number Publication date
JP2010517739A (en) 2010-05-27
KR101381488B1 (en) 2014-04-04
CN101600504B (en) 2011-06-15
DK2125230T3 (en) 2013-09-08
US8141801B2 (en) 2012-03-27
EP2125230B8 (en) 2013-07-17
RU2453372C2 (en) 2012-06-20
US20110240774A1 (en) 2011-10-06
US7971808B2 (en) 2011-07-05
RU2009128952A (en) 2011-03-10
ES2424021T3 (en) 2013-09-26
WO2008092542A1 (en) 2008-08-07
DE102007005250B3 (en) 2008-01-17
MX2009007307A (en) 2009-08-07
EP2125230A1 (en) 2009-12-02
AU2008210059B2 (en) 2011-08-11
AU2008210059A1 (en) 2008-08-07
UA97510C2 (en) 2012-02-27
ZA200905382B (en) 2010-10-27
KR20090115160A (en) 2009-11-04
US20100102151A1 (en) 2010-04-29
CA2677268A1 (en) 2008-08-07
PL2125230T3 (en) 2013-11-29
BRPI0806627A2 (en) 2011-09-13
CN101600504A (en) 2009-12-09
CA2677268C (en) 2014-07-08
JP5358457B2 (en) 2013-12-04

Similar Documents

Publication Publication Date Title
EP2125230B1 (en) Method for the continuous dry milling process of a vertical grinding mill and vertical grinding mill
EP2764808B1 (en) Grinder
DE4432200C1 (en) Agitator mill
DE4447321C2 (en) Agitator mill for wet comminution, with separator to retain grinding beads
DE3311433A1 (en) CLASSIFICATION OF GRIND FROM VERTICAL ROLL MILLS
EP2155353B1 (en) Press screw separator
EP1468739A1 (en) Agitator ball mill
EP0460490B1 (en) Air classifier
DD288987A5 (en) stirred ball mill
EP2632598A2 (en) Roller mill
DE8425837U1 (en) Roller mill
WO2009024159A1 (en) Stirrer mill
DE1286386B (en) Impact mill or centrifugal mill with sifter
EP0700721B1 (en) Agitator mill
DE3811910C2 (en) Mill and method for grinding and drying a moist product simultaneously
EP1080786A1 (en) Method, device and system for fluidised-bed jet mill
DE68926105T2 (en) DEVICE AND METHOD FOR GRINDING AND POWDERING
DE19948727A1 (en) Circuit grinding device with high pressure roller mill and sifter
DE10139413A1 (en) Apparatus for mixing powdered or granular solid with liquid comprises solid feed device, liquid feed devices, acceleration chamber, solid feed chamber, mixing chamber, and compression chamber
CH660073A5 (en) VACUUM DRYING DEVICE.
EP0700724B2 (en) Method and apparatus for continously autogenously milling a flowable processing material
DE4402609C1 (en) Agitator ball mill
DE3222890A1 (en) POWDER MILL DEVICE
EP3541523A1 (en) Mill
EP1350569B1 (en) Waste separation apparatus

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 20090703

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR

DAX Request for extension of the european patent (deleted)
GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

GRAS Grant fee paid

Free format text: ORIGINAL CODE: EPIDOSNIGR3

GRAA (expected) grant

Free format text: ORIGINAL CODE: 0009210

AK Designated contracting states

Kind code of ref document: B1

Designated state(s): AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MT NL NO PL PT RO SE SI SK TR

REG Reference to a national code

Ref country code: GB

Ref legal event code: FG4D

Free format text: NOT ENGLISH

REG Reference to a national code

Ref country code: CH

Ref legal event code: EP

REG Reference to a national code

Ref country code: AT

Ref legal event code: REF

Ref document number: 615318

Country of ref document: AT

Kind code of ref document: T

Effective date: 20130615

REG Reference to a national code

Ref country code: SE

Ref legal event code: TRGR

RAP2 Party data changed (patent owner data changed or rights of a patent transferred)

Owner name: MASCHINENFABRIK GUSTAV EIRICH GMBH & CO. KG

REG Reference to a national code

Ref country code: IE

Ref legal event code: FG4D

Free format text: LANGUAGE OF EP DOCUMENT: GERMAN

REG Reference to a national code

Ref country code: DE

Ref legal event code: R096

Ref document number: 502008010069

Country of ref document: DE

Effective date: 20130801

REG Reference to a national code

Ref country code: RO

Ref legal event code: EPE

REG Reference to a national code

Ref country code: DK

Ref legal event code: T3

REG Reference to a national code

Ref country code: ES

Ref legal event code: FG2A

Ref document number: 2424021

Country of ref document: ES

Kind code of ref document: T3

Effective date: 20130926

REG Reference to a national code

Ref country code: NO

Ref legal event code: T2

Effective date: 20130605

REG Reference to a national code

Ref country code: GR

Ref legal event code: EP

Ref document number: 20130401727

Country of ref document: GR

Effective date: 20130920

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130605

Ref country code: SI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130605

Ref country code: FI

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130605

REG Reference to a national code

Ref country code: NL

Ref legal event code: VDEP

Effective date: 20130605

REG Reference to a national code

Ref country code: LT

Ref legal event code: MG4D

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: BG

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130905

Ref country code: HR

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130605

REG Reference to a national code

Ref country code: PL

Ref legal event code: T3

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: LV

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130605

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: PT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20131007

Ref country code: EE

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130605

Ref country code: SK

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130605

Ref country code: IS

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20131005

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: NL

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130605

PLBE No opposition filed within time limit

Free format text: ORIGINAL CODE: 0009261

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT

26N No opposition filed

Effective date: 20140306

REG Reference to a national code

Ref country code: DE

Ref legal event code: R097

Ref document number: 502008010069

Country of ref document: DE

Effective date: 20140306

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MC

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130605

Ref country code: LU

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20140104

REG Reference to a national code

Ref country code: IE

Ref legal event code: MM4A

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20140104

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 9

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: MT

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130605

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: CY

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT

Effective date: 20130605

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: HU

Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT; INVALID AB INITIO

Effective date: 20080104

REG Reference to a national code

Ref country code: FR

Ref legal event code: PLFP

Year of fee payment: 10

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: CH

Payment date: 20161207

Year of fee payment: 10

Ref country code: CZ

Payment date: 20161227

Year of fee payment: 10

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: PL

Payment date: 20161208

Year of fee payment: 10

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: RO

Payment date: 20170103

Year of fee payment: 10

Ref country code: NO

Payment date: 20170123

Year of fee payment: 10

Ref country code: SE

Payment date: 20170125

Year of fee payment: 10

Ref country code: FR

Payment date: 20170124

Year of fee payment: 10

Ref country code: GR

Payment date: 20170124

Year of fee payment: 10

Ref country code: DE

Payment date: 20170327

Year of fee payment: 10

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: BE

Payment date: 20170124

Year of fee payment: 10

Ref country code: AT

Payment date: 20161209

Year of fee payment: 10

Ref country code: DK

Payment date: 20170125

Year of fee payment: 10

Ref country code: GB

Payment date: 20170125

Year of fee payment: 10

PGFP Annual fee paid to national office [announced via postgrant information from national office to epo]

Ref country code: IT

Payment date: 20170125

Year of fee payment: 10

Ref country code: ES

Payment date: 20170124

Year of fee payment: 10

Ref country code: TR

Payment date: 20170102

Year of fee payment: 10

REG Reference to a national code

Ref country code: DE

Ref legal event code: R119

Ref document number: 502008010069

Country of ref document: DE

REG Reference to a national code

Ref country code: DK

Ref legal event code: EBP

Effective date: 20180131

REG Reference to a national code

Ref country code: NO

Ref legal event code: MMEP

REG Reference to a national code

Ref country code: SE

Ref legal event code: EUG

REG Reference to a national code

Ref country code: CH

Ref legal event code: PL

REG Reference to a national code

Ref country code: AT

Ref legal event code: MM01

Ref document number: 615318

Country of ref document: AT

Kind code of ref document: T

Effective date: 20180104

GBPC Gb: european patent ceased through non-payment of renewal fee

Effective date: 20180104

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: SE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20180105

Ref country code: DE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20180801

Ref country code: RO

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20180104

Ref country code: NO

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20180131

Ref country code: FR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20180131

REG Reference to a national code

Ref country code: FR

Ref legal event code: ST

Effective date: 20180928

REG Reference to a national code

Ref country code: BE

Ref legal event code: MM

Effective date: 20180131

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: AT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20180104

Ref country code: LI

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20180131

Ref country code: GB

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20180104

Ref country code: CH

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20180131

Ref country code: BE

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20180131

Ref country code: CZ

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20180104

Ref country code: GR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20180802

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: DK

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20180131

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: IT

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20180104

REG Reference to a national code

Ref country code: ES

Ref legal event code: FD2A

Effective date: 20190730

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: ES

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20180105

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: PL

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20180104

PG25 Lapsed in a contracting state [announced via postgrant information from national office to epo]

Ref country code: TR

Free format text: LAPSE BECAUSE OF NON-PAYMENT OF DUE FEES

Effective date: 20180104