EP1333929B1 - Mahlen von körnigem material - Google Patents

Mahlen von körnigem material Download PDF

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Publication number
EP1333929B1
EP1333929B1 EP01982610A EP01982610A EP1333929B1 EP 1333929 B1 EP1333929 B1 EP 1333929B1 EP 01982610 A EP01982610 A EP 01982610A EP 01982610 A EP01982610 A EP 01982610A EP 1333929 B1 EP1333929 B1 EP 1333929B1
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EP
European Patent Office
Prior art keywords
impeller
grinding
suspension
grinding chamber
rotation
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.)
Expired - Lifetime
Application number
EP01982610A
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English (en)
French (fr)
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EP1333929A1 (de
Inventor
David Anthony Pearce
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.)
Imerys Minerals Ltd
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Imerys Minerals Ltd
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Publication date
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Publication of EP1333929A1 publication Critical patent/EP1333929A1/de
Application granted granted Critical
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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
    • B02C17/18—Details
    • B02C17/22—Lining for containers
    • 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
    • B02C17/16—Mills in which a fixed container houses stirring means tumbling the charge
    • B02C17/163—Stirring means
    • 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
    • B02C17/20—Disintegrating members

Definitions

  • the present invention relates to grinding, and particularly to an apparatus and a method for attrition grinding of particulate mineral materials.
  • US 4108385 discloses a colloidal mill having rotating grinding impellers in a vessel. Each blade is individually removable and exchangeable.
  • DE 1248440 discloses a grinding apparatus comprising a vessel, an impeller for agitating the contents of the vessel and a screen for varying the working volume of the vessel.
  • apparatus for grinding a suspension of a particulate solid material which apparatus comprises:
  • the configuration of the impeller provided in the apparatus of the invention causes enhanced grinding of the suspension of particulate material introduced into the apparatus.
  • the apparatus of the invention uses less energy during operation and achieves an improved level of grinding compared to prior art configurations.
  • a method of grinding a suspension of a particulate solid material in an apparatus as defined in the first aspect of the invention comprises:
  • the or each blade of the impeller has a leading face in the direction of rotation of the impeller, and preferably an upper edge of the said leading face is the leading edge and a lower edge of the said leading face is the trailing edge.
  • the impeller acts to drive the material in the grinding chamber downwards towards a base of the grinding chamber, thereby compressing the material in the grinding chamber.
  • the impeller may comprise a hub in the form of an annular body having a central opening which may be disposed on a substantially vertically orientated rotatable shaft.
  • An upper end of the shaft may be connected to a drive means to rotatably drive the shaft and the impeller during operation of the apparatus.
  • the annular body of the impeller may comprise a plurality of blades, each of the blades projecting radially from the annular body and preferably being equidistantly spaced from each other around an exterior face of the annular body, and each of the blades being pitched relative to the plane of rotation of the impeller.
  • the 'pitch' of a blade is defined as the angle between the chord of the blade (or the leading face of the blade in the direction of rotation of the impeller) and the plane of rotation of the blades of the impeller.
  • the impeller may have an annular body and a plurality of blades which may be unitary, or, alternatively, the plurality of blades may be fixedly secured to the annular body.
  • the pitched blades have a pitch angle in the range of from about 30° to about 60°. Optimally, the pitch angle is about 45° which during use of the apparatus of the invention advantageously produces a ground particulate material product having the desired particle size properties.
  • the plane of rotation of the impeller may be substantially perpendicular to a substantially vertically orientated rotatable impeller shaft.
  • each blade of the plurality of blades of the impeller has a substantially equivalent pitch angle; in other words, the chord of each blade may have a substantially equivalent gradient.
  • the preferred orientation of the pitched blades provides enhanced grinding of the suspension of particulate mineral material, to produce a ground mineral product having the required particle size with a reduce energy input.
  • a front (leading) face and/or a rear (trailing) face of each blade may be substantially flat (planar).
  • the impeller may comprise an arrangement of one or more tiers. Preferably, there are two, three or four tiers to further improve the performance of the method of the invention.
  • a two tier impeller provided in such apparatus may be called a double-pitched impeller.
  • the two tiered impeller may be arranged to rotate in unison and the upper tier of the impeller may be upwardly spaced from the lower tier so as to maximise the grinding effect of the impeller to comminute the suspension of particulate material introduced into the grinding chamber.
  • the impeller blades of the upper tier may be pitched at substantially an equivalent pitch angle to the impeller blades of the lower tier.
  • a comminuted product mainly consisting of particles having a particle size less than 2 ⁇ m is generally recognised in the art as being an aptly ground product.
  • the ground particulate product produced by the method of the invention advantageously consists of a greater yield of particles having a finer particle size than a ground product produced by known prior art grinding apparatus.
  • at least 90% by weight of the ground particulate product comprises particles having a particle size less than 5 ⁇ m; and preferably at least 70% by weight of the ground product comprises particles having a particle size less than 2 ⁇ m.
  • the apparatus of the invention uses less energy during operation and achieves an improved level of grinding compared to prior art configurations.
  • the amount of energy used by apparatus in accordance with the invention when grinding materials such as kaolin may be in the range of from about 20kWh/t to 150kWh/t; optimally the energy to be applied is about 55kWh/t to 150kWh/t.
  • the amount of energy to be applied when grinding materials such as calcium carbonate is preferably up to 3ookwh/t.
  • the use of a pitched impeller as described hereinbefore in the apparatus of the invention causes improved mixing of the charge resulting in improved grinding of the suspension of material introduced into the apparatus.
  • the 'charge' is defined as the mixture of the particulate grinding medium and the suspension of particulate solid material contained in the grinding chamber of the apparatus, which term is commonly known to skilled people in the art.
  • Such improved grinding is believed by the applicant to be caused by grinding of the mineral material suspension relatively near, or in the region of, an interior face of the wall of the grinding chamber. Grinding may be initiated by rotation of the pitched impeller at a suitable velocity so as to fluidise the (bed of) grinding medium and cause mixing of the grinding medium with the suspension of material to be ground.
  • a suitable rotational velocity of the pitched impeller may be in the range of from 50rpm to 400rpm.
  • a baffle member may be arranged over the particulate grinding medium and the suspension of particulate solid material.
  • the baffle member may be formed of an annular baffle plate having a central opening which may receive therethrough a substantially vertically orientated rotatable shaft.
  • the baffle plate may be made of a plastics material, such as, for example a polyurethane material.
  • the baffle member is of rigid construction and may be made of steel. It may be lined with an antiwear component such as a polyurethane coating or lining.
  • the baffle member is removably secured to an interior face of the wall of the grinding chamber, or, alternatively, to a top end of the grinding chamber.
  • the baffle member lies in a plane which is substantially perpendicular to a rotational axis of the impeller shaft.
  • the baffle member is located at a preset height over the charge, such that during operation of the apparatus the baffle member ensures that the charge is in a relatively compressed condition.
  • Such location of the baffle member optimises the energy delivered to each unit volume of the charge (through rotation of the impeller) thereby maximising the grinding of the mineral material suspension.
  • the baffle member also serves to limit the extent to which the charge rides up the interior face of the wall of the grinding chamber.
  • baffle member in the apparatus of the invention also further enhances the technical advantages which may be achieved by the provision of a pitched impeller as hereinbefore described. For instance, the yield of ground particulate product having a fine particle size (of ideally less than 2 ⁇ m) is further improved and the amount of energy applied to the apparatus is further reduced resulting in a particularly preferred embodiment of the invention.
  • the particulate grinding medium which may be employed according to the method of the invention may be of a natural or a synthetic material.
  • the grinding medium may comprise balls, beads or pellets of any hard mineral, ceramic or metallic material; such materials may include, for example, alumina, zirconia, zirconium, silicate, aluminium silicate or the mullite-rich material which is produced by calcining kaolinitic clay at a temperature in the range of from 1300°C to 1800°C.
  • particles of natural sand of a suitable particle size may be used in the method of the invention.
  • the type of and particle size of grinding medium to be selected for use in the invention may be dependent on the properties, such as, eg. the particle size of and the chemical composition of the feed suspension of inorganic material to be ground.
  • the particulate as, eg. the particle size of and the chemical composition of the feed suspension of inorganic material to be ground.
  • the particulate grinding medium comprises particles having an average diameter in the range of from 0.1mm to 6.0mm and, more preferably in the range of from 0.2mm to 4.0mm.
  • the grinding medium (or media) may be present in an amount of from 40% to 70% by volume of the charge; and, more preferably in an amount of about 60% by volume of the charge.
  • the suspension of particulate solid material to be comminuted by the method of the invention may be of an inorganic material and preferably a mineral material.
  • the mineral material may be used in its naturally occurring form or its chemically synthesised form.
  • Such materials may include, for example calcium carbonate, a kaolin clay and any other suitable mineral material.
  • the particulate inorganic material may preferably be present in an amount of from 10% to 85% by weight of the suspension; more preferably, the inorganic material may be present in an amount of from 20% to 80% by weight of the suspension. Most preferably, the inorganic material may be present in an amount of about 30% to 75% by weight of the suspension.
  • the suspension of solid material to be comminuted may be of a relatively high viscosity, in which case a dispersing agent may preferably be added to the suspension prior to comminution by the method of the invention.
  • the dispersing agent may be, for example, a water soluble condensed phosphate, a water soluble salt of a polysilicic acid or a polyelectrolyte, for example a water soluble salt of a poly(acrylic acid) or of a poly (methacrylic acid) having a number average molecular weight not greater than 20,000.
  • the amount of the dispersing agent used would generally be in the range of from 0.1 to 2.0% by weight, based on the weight of the dry particulate solid material.
  • the suspension may be introduced into the grinding chamber of the apparatus at a temperature in the range of from 4°C to 100°C.
  • a grinding apparatus generally designated by reference numeral 1 comprising a grinding chamber 2 containing a mixture 3 of a particulate grinding medium and a suspension of a particulate solid material.
  • a rotatable vertically orientated shaft 4 is suspended in the grinding chamber 3, an upper end of the shaft 4 being supported above the grinding chamber.
  • a motor 5 is connected to the shaft by means of a suitable gear arrangement.
  • a double pitched impeller 6 having two tiers 6a, 6b is secured to the shaft 4.
  • a conduit 7 having an inlet opening 8 is provided at the base of the grinding chamber 2 to supply a feed suspension of particulate solid material to the chamber 2 to be comminuted.
  • the inlet opening 8 is centrally located at the base of the grinding chamber 2 under a free end of the vertically orientated shaft 4.
  • the drive shaft 4 extends through an opening 20 in the baffle plate 16.
  • the pitched impeller 6 comprises an annular body 11 having a central opening for disposing the impeller 6 onto the shaft 4, and, six blades 12 radially projecting from the annular body 11.
  • Each blade 12 is pitched at an equivalent angle of about 45° relative to the plane of rotation of the impeller 6, such that a leading face 14 of each blade in the direction of rotation R of the impeller faces in a direction with a downward component.
  • the shaft 4 and the pitched impeller 6 rotate to fluidise the particulate grinding medium and cause mixing of the grinding medium with the suspension of particulate solid material, resulting in grinding of the particulate solid suspension.
  • the action of the pitched blades 6 and baffle plate 16 combine to compress the particulate solid suspension and improve the grinding efficiency.
  • the comminuted solid suspension comprising particles of a desired particle size exits the grinding chamber 2 through a mesh 9 and is carried along a conduit 10 for further refining if necessary.
  • a kaolin suspension containing 30% by weight solids was introduced through inlet conduit 7 into a grinding apparatus of the type illustrated in Figure 1 .
  • Silica sand present in an amount of 60% by volume was used as the grinding medium in the apparatus.
  • the magnitude of energy applied to the apparatus was 75kWh/t.
  • the comminuted suspension obtained from the apparatus through conduit 10 was found to contain 92% by weight of particles having a particle size less than 2 ⁇ m.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Crushing And Pulverization Processes (AREA)
  • Disintegrating Or Milling (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)

Claims (25)

  1. Vorrichtung (1) zum Mahlen einer Suspension eines partikulären festen Materials, umfassend:
    eine Mahlkammer (2), die ein partikuläres Mahlmittel enthält,
    eine Einrichtung (7, 8) zum Einbringen einer Suspension des partikulären festen Materials in die Mahlkammer (2),
    einen drehbaren Rührflügel (6) zum Rühren des partikulären Mahlmittels und der Suspension des partikulären festen Materials in der Mahlkammer (2), wobei der Rührflügel (6) mindestens einen Flügel (12) hat und der oder jeder Flügel (12) des Rührflügels (6) in Bezug auf die Ebene der Rotation des Rührflügels (6) geneigt ist, und
    eine Einrichtung (5) zum Antreiben des Rührflügels (6), so dass eine Suspension eines gemahlenen partikulären festen Materials hergestellt wird, dadurch gekennzeichnet, dass die Ebene der Rotation des Rührflügels (6) im Wesentlichen horizontal ist und dass der oder jeder Flügel (12) des Rührflügels (6) in Bezug auf die Ebene der Rotation des Rührflügels (6) geneigt ist, so dass das Material in der Mahlkammer (2) nach unten zu einer Grundfläche der Mahlkammer (2) getrieben wird.
  2. Vorrichtung nach Anspruch 1, dadurch gekennzeichnet, dass der Rührflügel (6) ein Ansatzstück (11) umfasst, wobei der oder jeder Flügel (12) des Rührflügels (6) im Wesentlichen in rechten Winkeln zur Rotationsachse des Rührflügels (6) von dem Ansatzstück (11) vorspringt.
  3. Vorrichtung nach Anspruch 2, dadurch gekennzeichnet, dass das Ansatzstück (11) einen ringförmigen Körper (11) mit einer zentralen Öffnung umfasst, die eine drehbare Antriebswelle (4) aufnimmt.
  4. Vorrichtung nach Anspruch 3, dadurch gekennzeichnet, dass die Antriebswelle (4) an dem Rührflügel (6) an einem Ende befestigt und mit Antriebseinrichtungen (5) an ihrem anderen Ende verbunden ist.
  5. Vorrichtung nach einem der Ansprüche 2 bis 4, dadurch gekennzeichnet, dass die Flügel (12) mit dem Ansatzstück (11) des Rührflügels einstückig gebildet sind.
  6. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass die Neigung des oder jedes Flügels (12) in Bezug auf die Ebene der Rotation des Rührflügels (6) zwischen 30° und 60° beträgt.
  7. Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, dass die Neigung des oder jedes Flügels (12) des Rührflügels (6) in Bezug auf die Ebene der Rotation des Rührflügels (6) 45° beträgt.
  8. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Rührflügel (6) eine Mehrzahl an Flügeln (12) hat und jeder Flügel (12) in im Wesentlichen demselben Winkel in Bezug zur Ebene der Rotation des Rührflügels (6) geneigt ist.
  9. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass der Rührflügel (6) eine Mehrzahl an Flügeln (12) umfasst, die in zwei oder mehr Ebenen (6a, 6b) angeordnet sind.
  10. Vorrichtung nach Anspruch 9, dadurch gekennzeichnet, dass die Ebenen (6a, 6b) übereinander in einem im Wesentlichen vertikal ausgerichteten Stapel liegen.
  11. Vorrichtung nach Anspruch 10, dadurch gekennzeichnet, dass jede Ebene (6a, 6b) von Flügeln an einem jeweiligen Ansatzstück (11) montiert ist, wobei die Ansatzstücke an einer gemeinsamen Antriebswelle (4) montiert sind.
  12. Vorrichtung nach einem der Ansprüche 9 bis 11, dadurch gekennzeichnet, dass die Flügel (12) der jeweiligen Ebenen (6a, 6b) des Rührflügels (6) in demselben Winkel in Bezug zur Ebene der Rotation des Rührflügels (6) geneigt sind.
  13. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass sich ein Prallelement (16) in der Mahlkammer (2) oberhalb des Rührflügels (6) befindet.
  14. Vorrichtung nach Anspruch 13, dadurch gekennzeichnet, dass das Prallelement (16) eine Platte umfasst, die sich in einer Ebene befindet, die im Wesentlichen parallel zur Ebene der Rotation des Rührflügels (6) ist.
  15. Vorrichtung nach Anspruch 13 oder 14, dadurch gekennzeichnet, dass das Prallelement (16) eine zentrale Öffnung (20) hat, die eine Antriebswelle (4) des Rührflügels aufnimmt.
  16. Vorrichtung nach einem der Ansprüche 13 bis 15, dadurch gekennzeichnet, dass das Prallelement (16) starr gebaut ist und mit einer Antiverschleißkomponente ausgestattet ist.
  17. Vorrichtung nach Anspruch 16, dadurch gekennzeichnet, dass die Antiverschleißkomponente eine Auskleidung oder ein Element mit einer Polyurethanbeschichtung umfasst.
  18. Vorrichtung nach einem der Ansprüche 13 bis 17, dadurch gekennzeichnet, dass das Prallelement (16) abnehmbar an einer Wand (18) der Mahlkammer (2) befestigt ist.
  19. Vorrichtung nach einem der Ansprüche 13 bis 18, dadurch gekennzeichnet, dass das Prallelement (16) sich in einer voreingestellten Höhe über der Suspension von partikulärem festem Material in der Mahlkammer (2) befindet.
  20. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass sich die Einrichtung (5) zum Antreiben des Rührflügels (6) über der Mahlkammer (2) befindet.
  21. Vorrichtung nach einem der vorhergehenden Ansprüche, dadurch gekennzeichnet, dass eine vordere Fläche (14) des oder jedes Flügels (12) in Richtung der Rotation des Rührflügels (6) in eine Richtung mit einer Abwärtskomponente zeigt.
  22. Verfahren zum Mahlen einer Suspension eines partikulären festen Materials in einer Vorrichtung (1) nach einem der vorhergehenden Ansprüche, gekennzeichnet durch folgende Schritte:
    Einbringen des partikulären Mahlmittels und der Suspension von partikulärem festem Material in die Mahlkammer (2) und
    Rühren des partikulären Mahlmittels und der Suspension von partikulärem festem Material durch Rotation des Rührflügels (6), so dass eine Suspension eines gemahlenen partikulären festen Materials hergestellt wird.
  23. Verfahren nach Anspruch 22, dadurch gekennzeichnet, dass das Mahlmittel Partikel mit einem mittleren Durchmesser im Bereich von 0,1 mm bis 6 mm umfasst.
  24. Verfahren nach Anspruch 23, dadurch gekennzeichnet, dass das Mahlmittel einen mittleren Durchmesser im Bereich von 0,2 mm bis 4 mm hat.
  25. Verfahren nach Anspruch 23 oder 24, dadurch gekennzeichnet, dass das Mahlmittel in einer Menge von 40% bis 70% vorliegt, bezogen auf das Volumen des Materials (3), das in die Mahlkammer (2) eingebracht wird.
EP01982610A 2000-11-13 2001-11-13 Mahlen von körnigem material Expired - Lifetime EP1333929B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GBGB0027659.2A GB0027659D0 (en) 2000-11-13 2000-11-13 Grinding of particulate material
GB0027659 2000-11-13
PCT/GB2001/005006 WO2002038274A1 (en) 2000-11-13 2001-11-13 Grinding of particulate material

Publications (2)

Publication Number Publication Date
EP1333929A1 EP1333929A1 (de) 2003-08-13
EP1333929B1 true EP1333929B1 (de) 2008-05-07

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EP01982610A Expired - Lifetime EP1333929B1 (de) 2000-11-13 2001-11-13 Mahlen von körnigem material

Country Status (12)

Country Link
US (1) US20040033765A1 (de)
EP (1) EP1333929B1 (de)
CN (1) CN100340345C (de)
AT (1) ATE394168T1 (de)
AU (1) AU2002214152A1 (de)
BR (1) BR0115324A (de)
CA (1) CA2428493A1 (de)
DE (1) DE60133918D1 (de)
DK (1) DK1333929T3 (de)
ES (1) ES2305117T3 (de)
GB (1) GB0027659D0 (de)
WO (1) WO2002038274A1 (de)

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CN102527476B (zh) * 2011-12-29 2014-08-06 内蒙古超牌建材科技有限公司 非金属矿粉的湿法研磨系统及其研磨方法
CN107921436B (zh) * 2015-07-28 2024-05-28 美卓奥图泰芬兰有限公司 研磨机的改进
CN106076511B (zh) * 2016-07-02 2019-01-08 黄碎存 一种高效球磨机
CN107321468B (zh) * 2017-07-13 2024-02-20 山东华唐环保科技有限公司 煤质检测系统煤粉精研磨设备
FR3086374B1 (fr) * 2018-09-26 2020-10-09 Commissariat Energie Atomique Four a soles multiples comprenant des bras supportant des dents de rablage a profil optimise, application a la torrefaction de biomasse
CN112221617A (zh) * 2019-06-30 2021-01-15 西安众力沥青有限公司 研磨机构及研磨装置

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US5820040A (en) * 1995-12-19 1998-10-13 Hockmeyer Equipment Corp. Basket media mill with stirring rods and counterpart stators
JPH10309452A (ja) * 1997-03-11 1998-11-24 Shinko Inbesuto:Kk 粉粒体精密処理装置

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CN100340345C (zh) 2007-10-03
CN1486218A (zh) 2004-03-31
GB0027659D0 (en) 2000-12-27
ATE394168T1 (de) 2008-05-15
WO2002038274A1 (en) 2002-05-16
US20040033765A1 (en) 2004-02-19
DE60133918D1 (de) 2008-06-19
AU2002214152A1 (en) 2002-05-21
ES2305117T3 (es) 2008-11-01
EP1333929A1 (de) 2003-08-13
DK1333929T3 (da) 2008-09-01
BR0115324A (pt) 2003-12-09
CA2428493A1 (en) 2002-05-16

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