EP0529434A1 - Broyeur-agitateur et méthode d'emploi de celui. - Google Patents

Broyeur-agitateur et méthode d'emploi de celui. Download PDF

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Publication number
EP0529434A1
EP0529434A1 EP92113855A EP92113855A EP0529434A1 EP 0529434 A1 EP0529434 A1 EP 0529434A1 EP 92113855 A EP92113855 A EP 92113855A EP 92113855 A EP92113855 A EP 92113855A EP 0529434 A1 EP0529434 A1 EP 0529434A1
Authority
EP
European Patent Office
Prior art keywords
grinding
mill
outlet
ball mill
agitator
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.)
Granted
Application number
EP92113855A
Other languages
German (de)
English (en)
Other versions
EP0529434B1 (fr
Inventor
Ulrich Barthelmess
Ulrich Dr. Schindler
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.)
Omya GmbH
Original Assignee
Omya GmbH
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 Omya GmbH filed Critical Omya GmbH
Publication of EP0529434A1 publication Critical patent/EP0529434A1/fr
Application granted granted Critical
Publication of EP0529434B1 publication Critical patent/EP0529434B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • B02C17/002—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls with rotary cutting or beating elements
    • 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

Definitions

  • the invention relates to a method for operating an agitator ball mill according to the preamble of claim 1 and agitator ball mills in particular for this method.
  • Agitator ball mills with a fixed, vertically arranged, cylindrical grinding container, in which a vertical agitator shaft equipped with grinding disks are arranged, have proven themselves in practice; such a mill is e.g. known from U.S. Patent 2,855,156.
  • the grinding container has several inlets distributed over its axial length, through which the grinding stock is input distributed over the axial length and flows against the centrifugal effect radially from the outside inwards in such a way that a centrifugal fluidized bed is created in relation to the grinding media and the grinding stock is removed from the area free of grinding media by a grinding media separating device.
  • the ground material to be dispersed thus fills the entire interior of the grinding container.
  • the particles of the material to be ground arrive in a radial (or spiral) path from the inlet to the separating sieve arranged in the center of the grinding container. This essentially radial path is for a sufficient, uniform comminution too low, so that the regrind has to be passed through the mill several times.
  • centrifugal fluidized bed sought in this proposal is doubtful insofar as the radially outward centrifugal force is intended to counteract the inward flow force of the particles.
  • the grinding bed is loosened up, so to speak, no grinding pressure is obtained which would correspond to the centrifugal force applied per se. Because of the thick grinding bed, this mill tends to build up heat, which also limits the throughput of the mill.
  • a relatively high peripheral speed and thus a relative speed between the stirring elements and the housing is also required, which is associated with high abrasion and wear of grinding media, stirring elements and walls.
  • the invention is based on the same object as practically every mill, namely the greatest possible throughput with a small space requirement and in particular a narrow grain spectrum in the fine material.
  • an agitator ball mill of the type mentioned is operated at supercritical speed (at which the centrifugal force outweighs gravity) with a degree of filling of around 25%, the grinding media being retained in the mill.
  • a mill operated according to the invention has a thick one Grinding bed, the grinding bed preferably extending over 1/3 to 2/3 of the radius of the grinding container from the outside inwards.
  • the centrifugal force takes the place of (or in addition to) gravity.
  • Corresponding to the radial thickness of the grinding bed there is a high centrifugal force which increases in the direction radially outward; this increasing centrifugal force corresponds to a high grinding pressure, which takes the place of the hydrostatic grinding pressure based only on gravity in the conventional agitator ball mill according to US Pat. No. 2,855,156.
  • This centrifugal grinding pressure is practically arbitrarily adjustable by speed control. In contrast to the previously known mill, it is the same over the entire length or height of the mill.
  • the mill operated according to the invention leaves a large free interior space which is used primarily for removing water vapor formed in the interior of the grinding bed, so that overheating in the mill cannot occur.
  • a high grinding performance with a narrow grain spectrum and with a small space requirement is achieved.
  • a larger centrifugal force acts on the coarse and specifically heavy particles than on the smaller and lighter particles.
  • the grinding media have a greater density than the regrind. Therefore, radially on the outside, directly on the container wall, there is predominantly grinding media existing layer.
  • the regrind in particular slurry
  • the coarser particles of the ground material reach further outwards radially than the finer particles.
  • the feed material with the still coarse particles initially migrates radially outward due to the centrifugal force and is ground there by the grinding material which is larger due to the larger centrifugal force.
  • the now smaller particles are pushed further inwards, where they are further ground at the now lower grinding pressure.
  • the grinding pressure is therefore automatically adjusted to the particle size: the coarser particles that require a larger grinding pressure initially migrate radially outwards, into the zone of the larger grinding pressure, while the finer particles that require a lower grinding pressure or for which a smaller grinding pressure is cheaper to be subject to this smaller grinding pressure further radially inside.
  • this grinding bed Radially inside, concentrically within this grinding bed made up of individual cylindrical zones according to the specific weight, a free cylindrical - or slightly conical - cavity is obtained. Gases, in particular water vapor, can enter this cavity from the bed of the grinding bed and can then be discharged from the mill. By means of this water vapor discharged from the grinding bed, the grinding bed is constantly cooled, so that the throughput can be increased without the risk of overheating, in particular local overheating within the grinding bed.
  • the operating method according to the invention is primarily intended for continuous operation of horizontally arranged agitator ball mills, in which the ground material is continuously fed in at one end of the grinding container, preferably through a hollow shaft, and is removed at the opposite end.
  • the method according to the invention is also possible in batch operation.
  • vertically arranged agitator ball mills can also be operated according to the invention.
  • the grinding pressure due to the hydrostatic pressure is superimposed on the grinding pressure due to the centrifugal force, so there is a resulting grinding pressure in the direction obliquely downwards / outwards.
  • the agitators of the agitator shaft are preferably ring disks which are provided with through openings for removing the escaping water vapor.
  • agitator ball mill in which agitators in the form of concentric annular disks are also provided on the inner circumference of the grinding vessel, which engage radially inwardly between the agitator shaft agitators also formed by annular disks and whose inside diameter is smaller than the outside diameter of the Agitator shaft washers.
  • the mill is filled to such an extent that the inner cylindrical or conical surface of the grinding bed layer has a smaller inner radius than the inner radius of the grinding disks on the jacket of the grinding container.
  • the mill according to FIG. 1 as well as according to FIG. substantial from a rotatable, multi-part grinding container 1 and a concentric to this agitator shaft 2, on which ring disks 3 are attached at a uniform distance from each other.
  • the annular disks 3 have openings 4 on their radially inner area for the passage of the water vapor which forms within the grinding bed.
  • the grinding bowl and the agitator shaft are on both sides by means of the roller bearings 7,8; 9, 10 stored.
  • a pulley 5 is provided for the rotary drive of the grinding container 1, and a clutch 6 is provided for driving the agitator shaft 2.
  • the agitator shaft 2 has on one end face 1a a central bore 11 which widens conically at its inner end and is connected to the grinding chamber via at least one radial bore 12.
  • the suspension to be ground is pumped into the agitator ball mill through a feed pipe 13, which extends through the bore 11 to the area of the conical widening. The required amount of grinding media has previously been entered into the mill.
  • the grinding container 1 On the opposite end face 1b of the grinding container 1 there are at least one opening 15 as an outlet for the suspension and - radially inside the suspension outlets 15 - at least one opening 16 for the steam formed. These openings lead into a fixed collecting chamber 17 which has an outlet nozzle 18 for the steam on the upper side and an outlet nozzle 19 for the suspension on the underside.
  • the outlet openings 16 for steam lie evenly distributed on a circle within the circle with the outlet openings 15 for the suspension.
  • the radial distance between the outlet openings 15 determines the degree of filling.
  • This radial distance - and thus the degree of filling - is preferably adjustable.
  • the outlet openings 15 can be formed by radial slots, in each of which a slide or the like can be adjusted radially.
  • the mill is operated at supercritical speed with a degree of filling of at least 25%. Due to the centrifugal force, a cylindrical stratification is formed. A radially outer zone 20 is mainly filled with grinding media, while a radially inner zone 21 mainly consists of the grinding stock suspension. The radial thickness of the regrind suspension (the inner zone 21) decreases from the inlet to the outlet, i. H. due to the loss of flow pressure, there is a gradient towards the outlet openings 15. A corresponding, conical interior 14 is free of grinding media and suspension.
  • the mill is divided into a plurality of sections or chambers, which are connected to one another at their radially outer area.
  • the millbase suspension must therefore flow from the inlet side to the outlet side in each case around these ring disks on a substantially meandering flow path, as a result of which the grinding intensity is practically the same for all particles: this results in a higher product quality.
  • the additional stirring elements of the grinding container also increase the power consumption and thus the throughput.
  • stirring elements are also provided on the inner circumference of the grinding container 1.
  • These stirring elements consist of concentric rings or ring disks 22, which are arranged approximately centrally between the ring disks 3 of the shaft and whose inner diameter is smaller than the outer diameter of the ring disks 3 of the agitator shaft 2.
  • the subdivision of the mill into a plurality of sections is improved by means of these ring disks 22 on the container jacket.
  • the millbase suspension is thus forced to flow from the inlet side to the outlet side around these grinding ring disks 22 of the container casing 1 and the ring disks 3 of the shaft 2 on the meandering flow path. This further improves the grinding intensity.
  • the additional stirring elements of the grinding container also increase the power consumption and thus the throughput.
  • the steam is discharged via the openings 4 of the grinding rings 3, the steam outlet openings 16 and the steam outlet nozzle 18 and the mill is thus cooled. In this way, overheating of the mill is avoided despite the increased power consumption and thus the higher throughput.
  • the casing of the grinding container can also be designed other than cylindrical, in particular conical or double-conical.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Disintegrating Or Milling (AREA)
EP92113855A 1991-08-23 1992-08-14 Broyeur-agitateur et méthode d'emploi de celui. Expired - Lifetime EP0529434B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4128074 1991-08-23
DE4128074A DE4128074C2 (de) 1991-08-23 1991-08-23 Rührwerkskugelmühle

Publications (2)

Publication Number Publication Date
EP0529434A1 true EP0529434A1 (fr) 1993-03-03
EP0529434B1 EP0529434B1 (fr) 1996-06-12

Family

ID=6439012

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92113855A Expired - Lifetime EP0529434B1 (fr) 1991-08-23 1992-08-14 Broyeur-agitateur et méthode d'emploi de celui.

Country Status (9)

Country Link
US (1) US5312055A (fr)
EP (1) EP0529434B1 (fr)
JP (1) JP2576930B2 (fr)
AT (1) ATE139144T1 (fr)
CA (1) CA2076251C (fr)
DE (2) DE4128074C2 (fr)
DK (1) DK0529434T3 (fr)
ES (1) ES2088521T3 (fr)
GR (1) GR3020528T3 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012146784A3 (fr) * 2011-04-28 2012-12-20 Bühler AG Broyeur agitateur
CN114377794A (zh) * 2022-02-07 2022-04-22 王可新 一种土壤肥料生产用球磨造粒设备

Families Citing this family (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3174694B2 (ja) * 1994-09-28 2001-06-11 三菱重工業株式会社 横型ミルによる粉砕方法
DE19614295A1 (de) * 1995-04-21 1996-10-24 Friedrich Dr Ing Vock Verfahren und Vorrichtung zum Nassmahlen und Dispergieren von Feststoffpartikeln in Flüssigkeiten
WO1996039251A1 (fr) * 1995-06-06 1996-12-12 Kotobuki Eng. & Mfg. Co., Ltd. Broyeur humide d'agitation a billes et procede
CN1131113C (zh) * 1997-08-29 2003-12-17 劳安(管理)有限公司 颗粒物料碾磨机
AU732830B2 (en) * 1997-08-29 2001-05-03 Lowan (Management) Pty Limited Grinding mill
US6450428B1 (en) 1999-05-05 2002-09-17 Lowan (Management) Pty Limited Feed arrangement for grinding mill incorporating fluid feed
KR19990073270A (ko) * 1999-06-29 1999-10-05 정상옥 건식및습식겸용볼밀
JP3363148B1 (ja) 2002-06-06 2003-01-08 有限会社大東土木 乾式微粉末収集システム
BRPI0816273A2 (pt) * 2007-09-06 2015-03-17 Lowan Man Pty Ltd Moinho de moagem e método de moagem
DK2272591T3 (da) * 2009-07-06 2013-12-16 Bachofen Willy A Ag Kuglemølle med omrører
DE102012013279A1 (de) * 2012-07-05 2014-01-09 Roland Nied Verfahren zum Betrieb einer Rührwerkskugelmühle sowie Rührwerkskugelmühle dafür
CN102814218B (zh) * 2012-08-25 2016-05-11 向小月 基于同心双轴的研磨冷却装置
CN103657803A (zh) * 2012-09-25 2014-03-26 昆山尚达智机械有限公司 一种新型湿法球磨机
CN103394397A (zh) * 2013-07-20 2013-11-20 杜云增 湿式球式破碎机
CN104148146A (zh) * 2014-08-29 2014-11-19 灌阳县陈工选矿机械制造有限公司 一种球磨机
EP3025786A1 (fr) * 2014-11-28 2016-06-01 Omya International AG Appareil de broyage simultané et flottation par mousse
MX2018001017A (es) * 2015-07-28 2018-06-06 Outotec Finland Oy Mejoras en molinos.
US10500591B2 (en) * 2015-09-02 2019-12-10 Air Products And Chemicals, Inc. System and method for the preparation of a feedstock
WO2017203712A1 (fr) * 2016-05-27 2017-11-30 日環特殊株式会社 Dispositif de broyage de parois ou membranes cellulaires, et procédé de mise en œuvre de ce dispositif
DE102018122540B3 (de) 2018-09-14 2019-11-21 Vertical Power Mills Technology AG Vertikale Kugelmühle, Statorsegment für eine vertikale Kugelmühle und Verfahren zum Warten einer vertikalen Kugelmühle
US11691155B2 (en) 2020-09-17 2023-07-04 U.S. Silica Company Methods and apparatus for producing nanometer scale particles utilizing an electrosterically stabilized slurry in a media mill
KR102231445B1 (ko) * 2020-09-22 2021-04-12 주식회사 가람이엔지 수중 녹조 마이크로 분쇄기

Citations (3)

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Publication number Priority date Publication date Assignee Title
FR1289073A (fr) * 1961-05-04 1962-03-30 Kloeckner Humboldt Deutz Ag Broyeur pour le concassage fin de matières naturelles ou synthétiques
FR1315156A (fr) * 1961-12-06 1963-01-18 Machine à broyer et disperser des particules de matiere dans un liquide
US3223336A (en) * 1960-12-30 1965-12-14 Wienert Fritz Otto Grinding apparatus

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US2592994A (en) * 1942-05-28 1952-04-15 Smidth & Co As F L Method and apparatus for grinding by the use of grinding bodies subjected to centrifugal force
GB1024053A (en) * 1962-11-01 1966-03-30 British Titan Products Treatment of particulate solids
US2560972A (en) * 1947-12-09 1951-07-17 John B Martin Horizontal axis ball mill with peripheral screening and lifting bays
AT256052B (de) * 1963-10-19 1967-08-10 Jan Dipl Ing Kaspar Einrichtung zur Dispergierung von Suspensionen fester Teilchen auf kolloidale Feinheit
FR2015544A1 (fr) * 1968-08-12 1970-04-30 Masap Ag
DE2047244B2 (de) * 1970-09-25 1981-03-26 Gebrüder Netzsch, Maschinenfabrik GmbH & Co, 95100 Selb Rührwerksmühle zum kontinuierlichen Feinmahlen und Dispergieren fließfähigen Mahlgutes
DE2458841C2 (de) * 1974-12-12 1985-03-14 Draiswerke Gmbh, 6800 Mannheim Rührwerksmühle
ES222298Y (es) * 1976-07-13 1977-05-01 Oliver & Batlle, S. A. Disco perfeccionado para molienda.
DE3437866A1 (de) * 1984-10-16 1986-04-17 Basf Farben + Fasern Ag, 2000 Hamburg Dispergierverfahren und ruehrwerksmuehle zu seiner durchfuehrung
JPH0775677B2 (ja) * 1987-06-15 1995-08-16 三菱重工業株式会社 超微粉砕ミル
DE3838981A1 (de) * 1988-11-18 1990-05-23 Eirich Walter Ruehrwerkskugelmuehle

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3223336A (en) * 1960-12-30 1965-12-14 Wienert Fritz Otto Grinding apparatus
FR1289073A (fr) * 1961-05-04 1962-03-30 Kloeckner Humboldt Deutz Ag Broyeur pour le concassage fin de matières naturelles ou synthétiques
FR1315156A (fr) * 1961-12-06 1963-01-18 Machine à broyer et disperser des particules de matiere dans un liquide

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012146784A3 (fr) * 2011-04-28 2012-12-20 Bühler AG Broyeur agitateur
CN114377794A (zh) * 2022-02-07 2022-04-22 王可新 一种土壤肥料生产用球磨造粒设备

Also Published As

Publication number Publication date
DE4128074A1 (de) 1993-02-25
DK0529434T3 (da) 1996-10-14
DE59206535D1 (de) 1996-07-18
EP0529434B1 (fr) 1996-06-12
CA2076251C (fr) 1998-09-29
JP2576930B2 (ja) 1997-01-29
ATE139144T1 (de) 1996-06-15
US5312055A (en) 1994-05-17
GR3020528T3 (en) 1996-10-31
CA2076251A1 (fr) 1993-02-24
DE4128074C2 (de) 1995-06-29
ES2088521T3 (es) 1996-08-16
JPH0691191A (ja) 1994-04-05

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