EP1948360B1 - Wälzmühle - Google Patents

Wälzmühle Download PDF

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Publication number
EP1948360B1
EP1948360B1 EP06806404A EP06806404A EP1948360B1 EP 1948360 B1 EP1948360 B1 EP 1948360B1 EP 06806404 A EP06806404 A EP 06806404A EP 06806404 A EP06806404 A EP 06806404A EP 1948360 B1 EP1948360 B1 EP 1948360B1
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EP
European Patent Office
Prior art keywords
roller mill
grinding
classifying
mill according
area
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
EP06806404A
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German (de)
English (en)
French (fr)
Other versions
EP1948360A1 (de
Inventor
André BÄTZ
Michael Keyssner
Udo Meyer
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.)
Loesche GmbH
Original Assignee
Loesche GmbH
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Application filed by Loesche GmbH filed Critical Loesche GmbH
Publication of EP1948360A1 publication Critical patent/EP1948360A1/de
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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
    • B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
    • B02C15/001—Air flow directing means positioned on the periphery of the horizontally rotating milling surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C15/00—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs
    • B02C2015/002—Disintegrating by milling members in the form of rollers or balls co-operating with rings or discs combined with a classifier

Definitions

  • the invention relates to a roller mill, in particular for crushing ores, according to the preamble of claim 1, for example, from WO 2005 000473 is known.
  • Mills which are to be used in ore processing, must ensure gentle comminution.
  • the regrind should only be comminuted to such an extent that the subsequent processes for obtaining the respective valuable material of the ore can be carried out as efficiently as possible. In particular, fines are to be avoided, as they have a negative effect on the subsequent processes.
  • Out DE 102 24 009 B4 is a shear-free ore crushing known, in which a LOESCHE type air flow roller mill is used.
  • the transport of the material to be ground within the grinding chamber and to the separator and to the downstream dust separator takes place with the aid of an air or gas stream, which flows from an annular channel arranged below the grinding bowl into the grinding chamber. Due to the flow direction from bottom to top and thus against gravity and the geometric conditions with respect to the height of the grinding chamber or distance to the viewing space, a correspondingly large kinetic energy must be available to ensure the pneumatic transport of the grinding material particles.
  • the energy consumption increases when the grain fraction to be transported has larger Mahlgutpelle.
  • ore processing requires a coarser grain fraction than is required by the cement and power plant industries, where subtleties of, for example, 15% R0.09 on cement raw material or coals are common for the downstream firing processes. In contrast, residual values of, for example, 20% R0.212 are required for ores. This leads to a higher energy requirement for the gas flow, which is why the known air flow rolling mills are not used or to a small extent.
  • An improved energy balance in the field of particle transport can be achieved if instead of the pneumatic conveying a mechanical promotion takes place.
  • the millbase placed in the center of a grinding bowl which is moved outwardly by the centrifugal force and comminuted in the grinding gap between the grinding rolls and the grinding path and then thrown over the grinding bowl edge, falls into an annular gap formed by the rotating grinding bowl and a stationary cylindrical housing ,
  • About inclined sheets in a lower part of the mill the material to be ground slips to mechanical conveyors, which transport the material to be separated to visual or screening devices where the fine fraction is separated from the coarse grain.
  • the coarse grain is re-fed to the mill for further comminution, and up to ten turns are required to achieve the desired grain size.
  • the fines are processed in downstream processes.
  • Such grinding circuits are operated with roller-type grinding machines of the LOESCHE type and are also known with mills of a different type, for example with roll presses (US Pat. WO 99/54514 A1 ).
  • a roller mill which is used for mixing materials and also for comminution, for example ores.
  • the roller mill has, at the level of the grinding bowl, a discharge opening in the grinding space wall for the comminuted material to be ground.
  • the horizontal Mahlgutaustrag done with the help of arranged on the underside of the grinding bowl fan blades.
  • the grinding process and the degree of comminution are determined by the design of the housing adjacent the grinding bowl or the grinding chamber wall, the horizontal discharge opening, the adjustable fan blades and vertical deflectors arranged between the grinding rolls.
  • An alternative formed mill has next to the horizontal Discharge opening still openings below the grinding bowl. In this passes over the Mahlschdorflrand and into the annular gap between the grinding bowl and the lower part of the mill falling, crushed material, which is then fed mechanically or by means of blowers for further treatment.
  • the invention has for its object to form a roller mill such that a mechanical or pneumatic transport of the crushed ground material accounts for a visual or screening system and the desired grain fraction can be achieved with a relatively low energy consumption.
  • a basic idea of the invention can be seen in the fact that a viewing apparatus is arranged below the grinding chamber, in which the comminuted grinding stock which has been crushed on the grinding bowl and falls downwards over the grinding bowl edge as a result of gravity is subjected to a screening and separated into a fine material and coarse material fraction.
  • the sighting takes place with the aid of a gas or air stream, referred to below as the classifying air stream, which is fed to the classifying device via a lower annular chamber and loaded with fine material.
  • the coarser material particles pass through a coarse material discharge from the viewing device, which is integrated into the roller mill for a "down" direction.
  • An energy saving is achieved because a promotion of the comminuted material to be ground to a sifter or to a screening system outside the mill is eliminated. Also, no kinetic energy is required, since the falling energy of Mahlgutpizate which are dropped over the Mahlschdorflrand exploited.
  • the viewing device and the annular chamber are arranged cylindrically around a lower region of the grinding bowl and at least one inlet opening for the classifying air stream and at least one fine material discharge and a coarse material discharge are formed in the annular chamber or wall of the classifying device.
  • the viewing device below the grinding chamber can be designed for a static and / or dynamic sighting.
  • dynamic classifying rotors may be arranged in the region of the annular space, which have a horizontal or vertical axis of rotation.
  • a static viewing device which is designed as a blind sifter and has inclined, overlapping lamellae.
  • These blinds classifiers can be operated with a relatively high dust concentration. By requiring less gas relative to the regrind, further energy savings are achieved.
  • the slats of the shutter device designed as a blind are directed obliquely downwards and outwards.
  • the ground material dropped over the grinding bowl edge which falls under the influence of the free falling energy into the sighting device, strikes the overlapping lamellae, wherein the mass flow slows down when hitting each lamella and due to the inclination over the Edge is led to the next slat.
  • the introduced classifying air flow flows through the blind and the regrind curtain.
  • the finer particles are directed outwards and leave the sighting device with the classifying air flow through the fines discharge.
  • the coarser particles fall down in the direction Grobgutaustrag, which is arranged in a bottom region of the reformerwandung.
  • the size of the particles deflected to the fines discharge can be influenced by the amount of gas and the resulting speeds between the fins. If the fines gas stream downstream of the fins has a deflection of e.g. experiences about 90 °, an additional separation effect is achieved.
  • cover elements are arranged which can limit the annular space opening axially and / or ring segment-like and serve for sealing.
  • the cover elements are expediently designed in the form of flaps or ring segments and delimit the annular space opening in such a way that it is completely filled by the ground material flow dropped over the grinding bowl edge.
  • the cover elements are expediently adjustable, in particular pivotable about a horizontal axis, attached to the grinding chamber wall.
  • Roller mills in modular design according to the LOESCHE principle which separately supported on mill stands and pivotally mounted grinding rollers are equipped with a viewing device, which each has viewing areas between the mill stands. In each field of view is then coaxial and outside a fines discharge, for example a nozzle, and arranged on the bottom side Grobgutaustrag, the merging takes place outside the mill.
  • a fines discharge for example a nozzle
  • the annular chamber in the lower part of the grinding bowl encloses this completely, wherein the seal can be done to the rotating grinding bowl by a labyrinth / gap seal.
  • a cylindrical section or a partially cylindrical connecting wall is arranged in each case between the individual viewing areas, which can be advantageously designed as blinds, which extends into the upper area of the grinding bowl and is sealed here, for example by a gap seal.
  • crushed ground material in the field of view between the mill stands guide plates are arranged below the grinding rollers in the annular space between the grinding bowl and the grinding chamber wall. These are roof-like in the upper area and supported on vertical baffles. The attachment can be made on the vertical connecting wall.
  • Fig. 1 shows a longitudinal section through the left side of a roller mill in the region of a grinding roller 4, which rolls on a grinding bowl 2.
  • the grinding bowl 2 rotates about an axis of rotation 25, and the grinding stock 7 comminuted in a grinding gap between the grinding roll 4 and the grinding bowl 2 passes via the grinding bowl edge 6 into an annular space 5.
  • the annular space 5 is separated from the grinding bowl edge 6 and a grinding chamber wall 3, which is in the Essentially oriented vertically, limited. Upwards, the grinding chamber can have a cover (not shown), and a dedusting device can be arranged.
  • the mill can also be driven in open-air operation.
  • a viewing device 10 is arranged, which is supplied to a classifying air stream 12 via an annular chamber 11.
  • the viewing device 10 is a static blind sifter, which has inclined and overlapping lamellae 16.
  • the sighting device 10 with the fins 16 is arranged such that the comminuted material to be ground 7, which falls on the Mahlschüsselrand 6 and the annulus 5 solely by falling energy down, impinges on the individual fins 16, braked and with the help of the prepare for the coarse material, is sighted.
  • the fines separated from the coarse material passes with the classifying air via a fines discharge 14, which extends almost over the entire height of the sighting device 10 and coaxial with this in an outer wall 13, to the outside, while the coarse material via a coarse material discharge 15 in a bottom wall 17 of Viewing device 10 is discharged.
  • Fig. 1 makes it clear that the fines discharge is arranged in the outer wall 13 such that the fines laden with fine air undergoes a deflection, whereby an additional separation effect is achieved. A rejection of possibly still entrained coarse particles can also be effected by guide plates 27, which are arranged in the fines 14.
  • Fig. 1 illustrates further that the bottom side wall 17, which is bounded on the inside of the annular chamber 11 and the outside of the coarse material discharge 15, the same inclination as the fins 16 of the sighting device 10 has.
  • cover elements 18 are pivotally attached to the grinding chamber wall 3, which prevent the classifying air 12 passes through the annulus 5 in the grinding chamber and can counteract the crushed grist 7 falling down.
  • cover elements 17 can be pivoted in such a way that the annular space 5 has an opening completely filled by the comminuted grinding stock flow.
  • the grinding chamber wall 3 may be formed in the region of the grinding bowl edge 6 as a baffle 24 and be provided with a wear-resistant lining (not shown).
  • Fig. 2 shows a viewing device 10 in a perspective view, which for installation below the grinding bowl of a roller mill in modular design of the LOESCHE type is trained.
  • the sighting device 10 is provided with viewing areas 20, which are arranged between the mill stands (not shown).
  • the annular chamber 11, in which the classifying air or the classifying gas 12 is introduced encloses the grinding bowl 2 (see FIG. 1 ) in a lower area completely.
  • the viewing areas 20 are in Fig. 2 Venetian blinds with slats 16 inclined outwards and downwards, in the region of which stubs are arranged on the outside as fine-material discharge 14 in the outer housing 13 (see FIG Fig. 1 ).

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Combined Means For Separation Of Solids (AREA)
EP06806404A 2005-11-14 2006-10-19 Wälzmühle Not-in-force EP1948360B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102005054209.3A DE102005054209B4 (de) 2005-11-14 2005-11-14 Wälzmühle
PCT/EP2006/010101 WO2007054191A1 (de) 2005-11-14 2006-10-19 Wälzmühle

Publications (2)

Publication Number Publication Date
EP1948360A1 EP1948360A1 (de) 2008-07-30
EP1948360B1 true EP1948360B1 (de) 2009-02-11

Family

ID=37496583

Family Applications (1)

Application Number Title Priority Date Filing Date
EP06806404A Not-in-force EP1948360B1 (de) 2005-11-14 2006-10-19 Wälzmühle

Country Status (12)

Country Link
US (1) US7690591B2 (pt)
EP (1) EP1948360B1 (pt)
CN (1) CN101102848A (pt)
AU (1) AU2006312782B2 (pt)
BR (1) BRPI0606535A2 (pt)
CA (1) CA2594507C (pt)
DE (2) DE102005054209B4 (pt)
DK (1) DK1948360T3 (pt)
MX (1) MX2007009130A (pt)
RU (1) RU2374000C2 (pt)
WO (1) WO2007054191A1 (pt)
ZA (1) ZA200705236B (pt)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9212404B2 (en) 2010-03-05 2015-12-15 Loesche Gmbh Preparation method for stainless steel slags and steelworks slags for recovery of metal

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102006039775A1 (de) * 2006-08-24 2008-02-28 Khd Humboldt Wedag Gmbh Sichteinrichtung zum Sichten körnigen Gutes und Kreislaufmahlanlage mit Einschaltung einer solchen Sichteinrichtung
TWI483787B (zh) * 2007-09-27 2015-05-11 Mitsubishi Hitachi Power Sys A grading device and an upright pulverizing device having the classifying device and a coal fired boiler device
DE102008040100A1 (de) * 2008-07-02 2010-01-07 Bühler AG Vorrichtung und Verfahren zur Fraktionierung von Mahlprodukten
WO2010000811A2 (de) 2008-07-02 2010-01-07 Bühler AG Vorrichtung und verfahren zur herstellung von mehl und/oder griess
CN101596483B (zh) * 2009-06-26 2011-08-03 南京凯盛国际工程有限公司 一种物料粉磨系统
CN102397806B (zh) * 2011-10-13 2015-08-26 郝志刚 立式磨机用物料分散装置
CN105855030B (zh) * 2015-09-24 2019-03-12 佛山科学技术学院 陶瓷原料辊磨机电磁振动筛分回料装置
DE102019200191A1 (de) * 2018-06-08 2019-12-12 Sms Group Gmbh Trockenaufbereitung von Kaolin bei der Herstellung von HPA
CN111804419B (zh) * 2020-06-16 2022-02-01 马鞍山采石矶涂料有限公司 一种可自动返料的研磨装置
CN114643104B (zh) * 2022-04-02 2023-07-18 天津水泥工业设计研究院有限公司 一种基于立式辊磨的磨辊挡料总成
WO2024074632A2 (de) * 2022-10-06 2024-04-11 Gebr. Pfeiffer Se Schüttgutmühle zur grobgutaufbereitung
CN116197008B (zh) * 2023-04-04 2024-02-23 青岛锐丰源化工有限公司 一种化工原料精细化处理装置

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9212404B2 (en) 2010-03-05 2015-12-15 Loesche Gmbh Preparation method for stainless steel slags and steelworks slags for recovery of metal

Also Published As

Publication number Publication date
AU2006312782B2 (en) 2010-12-23
RU2007126382A (ru) 2009-02-27
BRPI0606535A2 (pt) 2009-06-30
CN101102848A (zh) 2008-01-09
DK1948360T3 (da) 2009-06-02
MX2007009130A (es) 2007-11-21
DE102005054209B4 (de) 2014-05-28
RU2374000C2 (ru) 2009-11-27
US7690591B2 (en) 2010-04-06
US20080296422A1 (en) 2008-12-04
ZA200705236B (en) 2008-07-30
AU2006312782A1 (en) 2007-05-18
DE502006002854D1 (de) 2009-03-26
EP1948360A1 (de) 2008-07-30
WO2007054191A1 (de) 2007-05-18
CA2594507A1 (en) 2007-05-18
CA2594507C (en) 2012-05-29
DE102005054209A1 (de) 2007-05-24

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