EP0366759B1 - Verfahren zur zerkleinerung von sprödem mahlgut - Google Patents

Verfahren zur zerkleinerung von sprödem mahlgut Download PDF

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Publication number
EP0366759B1
EP0366759B1 EP89905398A EP89905398A EP0366759B1 EP 0366759 B1 EP0366759 B1 EP 0366759B1 EP 89905398 A EP89905398 A EP 89905398A EP 89905398 A EP89905398 A EP 89905398A EP 0366759 B1 EP0366759 B1 EP 0366759B1
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EP
European Patent Office
Prior art keywords
comminution
grinding
tube mill
stage
classifying
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.)
Revoked
Application number
EP89905398A
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German (de)
English (en)
French (fr)
Other versions
EP0366759A1 (de
Inventor
Franz Thomas
Herbert Weit
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.)
Christian Pfeiffer Maschinenfabrik GmbH and Co KG
Original Assignee
Christian Pfeiffer Maschinenfabrik GmbH and Co KG
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Filing date
Publication date
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Application filed by Christian Pfeiffer Maschinenfabrik GmbH and Co KG filed Critical Christian Pfeiffer Maschinenfabrik GmbH and Co KG
Priority to AT89905398T priority Critical patent/ATE97836T1/de
Publication of EP0366759A1 publication Critical patent/EP0366759A1/de
Application granted granted Critical
Publication of EP0366759B1 publication Critical patent/EP0366759B1/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
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/08—Separating or sorting of material, associated with crushing or disintegrating
    • B02C23/10—Separating or sorting of material, associated with crushing or disintegrating with separator arranged in discharge path of crushing or disintegrating zone
    • B02C23/12—Separating or sorting of material, associated with crushing or disintegrating with separator arranged in discharge path of crushing or disintegrating zone with return of oversize material to crushing or disintegrating zone
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C21/00—Disintegrating plant with or without drying of the material

Definitions

  • the invention relates to a method for comminuting brittle regrind according to the preamble of claim 1.
  • the good-bed roller mills usually used for simultaneous single-grain and good-bed grinding have the advantage that they can be used to grind relatively fine-grained and regrind particles ⁇ 2 mm are possible.
  • the fact that coarser ground material particles also pass through the material bed roller mill appears even more serious.
  • a material bed roller mill requires a relatively high investment compared to other mills or crushers.
  • the coarse particles passing through the material bed roller mill make it necessary that, for. B. the downstream comminution by means of a gravity mill and in particular a tube mill must also be equipped with grinding media of relatively large diameter. Large steel balls are therefore also required due to the coarse particles that pass through a material bed roller mill. If the degree of filling of a tube mill is reduced, care must be taken to ensure that the relatively large steel balls do not smash the cladding panels, the slotted and end wall panels.
  • the present invention is therefore based on the object of designing the generic method in such a way that, on the one hand, the specific energy requirement for a specific quantity of regrind is improved, and furthermore the overall economy is significantly increased by a sharp reduction in investment costs, and the method should also be flexible in design.
  • the first comminution is followed directly by a sieving process, with which undesired oversize particles can be fed back into the first comminution in the cyclic process.
  • the fine grain obtained is fed to the second comminution.
  • the second comminution takes place in a downstream tube mill, which is designed for the grain size of the screenings with regard to the size of the grinding media and can be operated with a degree of filling of less than 30%.
  • the method according to the invention it is thus possible to achieve a defined feed material at the exit of the primary crusher.
  • the diameter of the grinding media used can now be kept smaller in the second comminution stage, for which a ball or tube mill with grinding media is particularly suitable, so that the pre-comminuted material is specifically stressed and thus the degree of filling can be reduced.
  • the size or the coarse particles of the screening process are suitably returned to the second comminution stage.
  • the material to be discharged which is essentially in the form of agglomerates (slugs)
  • agglomerates slugs
  • the material to be discharged can additionally be fed to a downstream centrifugal crusher for deagglomeration and coarse material comminution in order to be available for further treatment without agglomerates.
  • Another advantage of the method is that no agglomerates (slugs) are produced in the centrifugal crusher. This also enables problem-free separation of the pre-shredded goods into coarse and fine goods (e.g. by sifting). The fine material is drawn off before the second size reduction and thus the economy is further increased, since no unwanted fine material gets into the second size reduction.
  • the first comminution is followed directly by a sieving process, so that undesired oversize particles can be fed back into the first comminution in the cyclic process. This ensures that only the desired fine material is fed to the ball or tube mill.
  • a process flow is shown in a schematic representation, in which the ground material, e.g. Can be cement clinker, the entire system 1 is fed from a feed bunker 2 via a scale 3.
  • a time-metered supply can be carried out by means of the scale 3.
  • the ground material is fed to a primary crusher 4, which is preferably a centrifugal crusher.
  • the material comminuted up to a relatively defined maximum grain size in the centrifugal crusher 4 is passed directly over a section 5 into the second comminution stage, which is designed here as a two-chamber tube mill 6.
  • the first chamber 7 of the tube mill 6 has, for example, steel balls as grinding media with diameters in the range from 40 to 60 mm.
  • the second chamber 8 adjoining the intermediate wall 9, on the other hand, is provided with steel balls in the range from 10 to 30 mm and preferably with diameters in the range from 15 to 30 mm.
  • the coarse material is discharged downwards and passes via a conveyor line which is provided with a bucket elevator 11, and the line 17 into a classifier 18.
  • a crossflow classifier is particularly suitable, the size of which is via the coarse material outlet 20 and the line 21 of the tube mill 6 are fed as a second comminution stage.
  • the fines particles discharged into the fines outlet are withdrawn from the process cycle via a removal section 16.
  • the air-fine particle mixture at the outlet 23 of the tube mill 6 is fed via a line 12 to a filter 13 in which the fine particles are separated from the air.
  • the fine material particles are fed to the removal section 16 via the fine material outlet 15, while the air is discharged via the air outlet 14 may be returned to the process cycle.
  • the regrind 4 comminuted at the exit of the relatively low investment has a well-defined grain size, in which there are largely no larger regrind particles beyond the desired size range. This makes it possible to work with steel balls of reduced diameter in the second downstream comminution stage for which the two-chamber tube mill is provided, the degree of filling of the tube mill also being below the usual values; in particular less than 30%.
  • FIG. 2 shows a variant of the system according to FIG. 1.
  • Corresponding reference numerals relate to the same parts of the system.
  • the difference in comparison to the embodiment according to FIG. 1 lies in the fact that the centrifugal crusher 4 of the first size reduction stage is immediately followed by the classifier 18.
  • the grit of the classifier 18 in the example according to FIG. 2 is now fed via the coarse material outlet 20 and the line 21 in the circuit of the tube mill 6, the equipment of which with grinding media is corresponding to the embodiment according to FIG.
  • FIG. 3 shows a process sequence according to the invention.
  • the same reference numerals as in the previous figures denote the same units.
  • a screening process is followed by the pre-crushing.
  • the ground material leaving the centrifugal crusher 4 is therefore passed through a sieve 35.
  • the oversize particles obtained in the sieve 35 either reach the bucket elevator 11 via the line 36a and are recirculated there or are fed to the centrifugal crusher via the line 36b.
  • the ground material, which is obtained up to a desired particle size is fed via line 37 to the tube mill 6 for further comminution.
  • the material fed to the bucket elevator 11 passes into the sifter 18.
  • the coarse material obtained after the sifting process is again guided into the second comminution stage 6 via the return line 41a.
  • the scope of the method according to the invention relates not only the grinding of cement clinker, but can also be used with comparable materials such as limestone, ores, coal, quartz sand or grit, these details being understood only as examples.
  • the method according to the invention and the plant alternatives provided therefor reduce the specific work required per intended quantity of regrind, this being supplemented by wear reductions at least on the second size reduction stage.
  • lower investment costs are required than in comparable systems based on the prior art.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Disintegrating Or Milling (AREA)
  • Combined Means For Separation Of Solids (AREA)
EP89905398A 1988-05-04 1989-05-03 Verfahren zur zerkleinerung von sprödem mahlgut Revoked EP0366759B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT89905398T ATE97836T1 (de) 1988-05-04 1989-05-03 Verfahren zur zerkleinerung von sproedem mahlgut.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3815217A DE3815217A1 (de) 1988-05-04 1988-05-04 Verfahren zur zerkleinerung von sproedem mahlgut
DE3815217 1988-05-04

Publications (2)

Publication Number Publication Date
EP0366759A1 EP0366759A1 (de) 1990-05-09
EP0366759B1 true EP0366759B1 (de) 1993-12-01

Family

ID=6353633

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89905398A Revoked EP0366759B1 (de) 1988-05-04 1989-05-03 Verfahren zur zerkleinerung von sprödem mahlgut

Country Status (5)

Country Link
US (1) US5058813A (ja)
EP (1) EP0366759B1 (ja)
JP (1) JPH0751221B2 (ja)
DE (2) DE3815217A1 (ja)
WO (1) WO1989010790A1 (ja)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH089016B2 (ja) * 1991-05-14 1996-01-31 川崎重工業株式会社 竪型ローラミルによる粉砕装置および粉砕方法
DE4122717C2 (de) * 1991-07-09 1994-04-14 Ear Gmbh Verfahren und Vorrichtung zur Aufbereitung von Metallträger-Katalysatoren
DK12893A (da) * 1993-02-04 1994-08-05 Smidth & Co As F L Fremgangsmåde til fremstilling af normal såvel som ultrafin cement
DE4320025A1 (de) * 1993-06-17 1994-12-22 Krupp Polysius Ag Mahlanlage und Verfahren zum Mahlen und Sichten von sprödem Mahlgut
DE102011088414A1 (de) * 2011-12-13 2013-06-13 Cerdur Ceramic GmbH Mahlverfahren und Mahlvorrichtung zur Herstellung von Nano-Mahlgut
DE102013005931A1 (de) * 2013-04-05 2014-10-09 Micro Impact Mill Limited Vorrichtung und Verfahren zum Erzzerkleinern mit Rückführung
CN103263966A (zh) * 2013-06-17 2013-08-28 长兴电子材料（昆山）有限公司 一种粉碎球磨一体机

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1219779B (de) * 1962-12-12 1966-06-23 Polysius Gmbh Mahltrocknungsverfahren und Anlage zur Durchfuehrung des Verfahrens
DE1266618B (de) * 1965-05-12 1968-04-18 Rheinische Kalksteinwerke Verfahren zur Regelung fuer das Feinmahlen von Mahlgut unterschiedlicher Mahlbarkeit bei konstanter Aufgabenmenge
DE2620461A1 (de) * 1976-05-08 1977-11-24 Kloeckner Humboldt Deutz Ag Mahltrocknungsanlage
DE2620463C2 (de) * 1976-05-08 1983-01-13 Klöckner-Humboldt-Deutz AG, 5000 Köln Mahltrocknungsanlage
US4398673A (en) * 1980-06-12 1983-08-16 Domtar Industries Inc. Method of classifying and comminuting a gypsum ore or the like
DE3302176A1 (de) * 1983-01-24 1984-07-26 Klöckner-Humboldt-Deutz AG, 5000 Köln Verfahren und anlage zur kontinuierlichen druckzerkleinerung sproeden mahlgutes
DE3314103A1 (de) * 1983-04-19 1984-10-25 Klöckner-Humboldt-Deutz AG, 5000 Köln Verfahren und anlage zur gemeinsamen mahlung zweier oder mehrerer unterschiedlich mahlbarer sproeder stoffe
DE3506486A1 (de) * 1985-02-23 1986-08-28 Klöckner-Humboldt-Deutz AG, 5000 Köln Einrichtung zur zerkleinerung und mahlung sproeden mahlgutes wie zum beispiel zementklinker, erz, kohle oder dergleichen
DE3520069A1 (de) * 1985-06-04 1986-12-04 Krupp Polysius Ag, 4720 Beckum Verfahren und anlage zur zweistufigen zerkleinerung
DE3609229A1 (de) * 1986-03-19 1987-09-24 Krupp Polysius Ag Verfahren und anlage zur zerkleinerung von sproedem mahlgut
DE3644342A1 (de) * 1986-12-23 1988-07-07 Krupp Polysius Ag Verfahren und anlage zur zweistufigen zerkleinerung von sproedem mahlgut
DE3717976A1 (de) * 1987-05-27 1988-12-08 Krupp Polysius Ag Verfahren und anlage zur zerkleinerung von mahlgut

Also Published As

Publication number Publication date
US5058813A (en) 1991-10-22
DE3815217A1 (de) 1989-11-16
WO1989010790A1 (en) 1989-11-16
EP0366759A1 (de) 1990-05-09
DE58906304D1 (de) 1994-01-13
JPH02501544A (ja) 1990-05-31
JPH0751221B2 (ja) 1995-06-05
DE3815217C2 (ja) 1991-01-10

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