EP0292724B1 - Procédé et installation de broyage pour matériau friable - Google Patents

Procédé et installation de broyage pour matériau friable Download PDF

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Publication number
EP0292724B1
EP0292724B1 EP88106819A EP88106819A EP0292724B1 EP 0292724 B1 EP0292724 B1 EP 0292724B1 EP 88106819 A EP88106819 A EP 88106819A EP 88106819 A EP88106819 A EP 88106819A EP 0292724 B1 EP0292724 B1 EP 0292724B1
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EP
European Patent Office
Prior art keywords
grinding
crushed
roller mill
returned
stage
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
EP88106819A
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German (de)
English (en)
Other versions
EP0292724A2 (fr
EP0292724A3 (en
Inventor
Osbert Dipl.-Ing. Knobloch
Manfred Dipl.-Ing. Müller
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.)
ThyssenKrupp Industrial Solutions AG
Original Assignee
Krupp Polysius AG
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Application filed by Krupp Polysius AG filed Critical Krupp Polysius AG
Publication of EP0292724A2 publication Critical patent/EP0292724A2/fr
Publication of EP0292724A3 publication Critical patent/EP0292724A3/de
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C4/00—Crushing or disintegrating by roller mills
    • B02C4/02—Crushing or disintegrating by roller mills with two or more rollers
    • 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 (according to the preamble of claim 1) and a system (according to the preamble of claim 10) for crushing brittle regrind.
  • a method according to the preamble of claim 1 is known for example from EP-A-84 383.
  • Difficulties can arise here in the crushing of regrind of high humidity, which tends to stick and / or bake above a critical moisture value.
  • there are clay-containing raw material components in cement production that neither stick nor lead to moisture when the humidity is below 15%, but stick extremely strongly when the moisture is above 18% and even adhere to vertical walls.
  • the invention is therefore based on the object to design a method according to the preamble of claim 1 and a system according to the preamble of claim 10 so that even high moisture grist, which tends to stick and / or bake above a critical moisture value, comminutes properly can be.
  • a two-stage comminution of regrind takes place initially with the aid of two different mills, these two mills being connected to form a recirculating grinding system via a single classifier, and in contrast to the present invention - expressly the fresh, to be comminuted (moist) starting material should not be fed to the roller mill, but preferably to an impact hammer mill. Accordingly, moist fresh material is pre-comminuted in this first mill, which is preferably designed as an impact hammer mill, and at the same time partially dried with the supply of a hot gas stream in this mill.
  • the moist, fresh feed material is also fed to the two rollers of the material bed roller mill together with the recycled regrind partial stream. If at least part of the partial stream returned to the roll nip is sufficiently dried before it is re-introduced into the roll nip, it can be achieved that a mixed moisture which is below the critical moisture content is established in the roll nip. In this way, the properties of the bulk material and the intake behavior of the ground material are decisively improved and sticking and caking of the ground material in the material bed roller mill are avoided.
  • the millbase to the material bed roller mill By supplying a dried partial stream the millbase to the material bed roller mill also achieves contact drying in the roller mill, which considerably facilitates the drying of the material as a whole.
  • the method according to the invention enables simple adaptation to a variable degree of moisture in the ground material to be ground. There is also the possibility of detecting only seasonal peaks in the material moisture by temporarily and / or partially drying and operating the method during the rest of the time without the use of heat.
  • FIGS. 1 to 3 Three exemplary embodiments of the method according to the invention are illustrated in FIGS. 1 to 3, each in a basic scheme.
  • the process diagram according to FIG. 1 contains a stage 1, in which the fresh regrind is drawn off.
  • This stage 1 can be formed, for example, by a bunker, a plate belt or a screw.
  • stage 2 the fresh regrind is mixed with recycled regrind.
  • This stage 2 can be formed, for example, by a belt, a box feeder or a mixing screw.
  • stage 3 the ground material is crushed.
  • This stage 3 is formed by a material bed roller mill, the two rollers of which are pressed against one another at high pressure.
  • stage 4 which is used to disintegrate or deagglomerate the ground material. It is formed, for example, by a hammer mill, an impact mill, a short grinding tube, a mixing bowl or a disintegrator.
  • stage 4 The deagglomerated regrind then passes from stage 4 to stage 5, in which the regrind is dried.
  • This stage can be formed, for example, by a riser dryer, a spreading dryer or a drying drum.
  • Partial stage 1 can be formed, for example, by a deflector, the separating cut of which is, for example, in the range between 200 and 500 ⁇ m.
  • the sub-stage 6.2 can be formed by a static classifier or a rotor classifier be, the separation cut is for example in the range between 10 and 50 microns or between 20 and 100 microns.
  • the coarse material of both sub-stages 6.1 and 6.2 is returned to stage 2 and mixed with fresh regrind there before being re-introduced into the comminution stage.
  • stage 7 can be formed by a cyclone, a filter or by classifier cyclones.
  • Stages 4 and 5 can be combined here into a single step, so that the ground material crushed in the nip is dried and deagglomerated at the same time.
  • a scatter dryer possibly with a short grinding part, can be used for this purpose.
  • two sub-stages 6a and 6b connected in parallel are provided in the classifying stage, the coarse material occurring in both sub-stages being returned to stage 2.
  • the fine material flows of the sub-stages 6a and 6b are jointly passed to stage 7 for the separation of the finished product.
  • the material discharged by gravity can be classified in the high-performance classifier (for example in a rotor classifier with its own air circulation).
  • the material discharged with the gas flow can be classified in a flow classifier.
  • both classifying units i.e. the sub-stages 6a and 6b are combined.
  • stages 4 and 5 are interchanged in the order.
  • the ground material crushed in stage 3 is thus first dried in stage 5 and then disrupted or deagglomerated in stage 4.
  • stage 4 The goods discharged from stage 4 are partially fed to sub-stage 6a and partially to sub-stage 6b. The latter also receives a partial flow of the material discharged from stage 5.
  • the drying units for stage 5 include, in particular, a spreading dryer, an impact dryer or a drying drum in question. Since a certain deagglomeration already occurs in the dryer, this part of the dried material is fed together with the gas stream to sub-stage 6b (preferably a flow classifier). The rest of the dried material, which still contains agglomerates, is fed to stage 4 for digestion.
  • a hammer or impact mill, a disintegrator, a short tube mill or a mixing bowl can be considered as an aggregate for stage 4.
  • stage 4 The material broken down in stage 4 is mechanically guided to sub-stage 6a (a classifier).
  • sub-stage 6a a classifier
  • the sub-stages 6a and 6b can be combined, for example in the form of a current classifier with partial mechanical loading.
  • a portion of the finished goods must also be returned to the roller mill, and expediently one in a partial stream of the dried, but not yet classified material contained in the finished product.
  • Another possibility in the case of high moisture content of the fresh ground material is to operate the material bed roller mill with an energy conversion level that has been reduced so far and thereby to increase the circulation factor to such an extent that, with a predetermined drying of the ground material in the roller gap, a mixed moisture content arises which is below the critical moisture content.
  • a case can be given, for example, if the feed moisture is about three times the limit moisture (i.e. the critical moisture content), but if the circulation factor resulting from the grinding (at full energy conversion level) is lower, e.g. 2 is.
  • FIG. 4 shows the system diagram on which this is based, which corresponds to the variant according to FIG. 1 (the reference numerals also used in FIG. 1 being used for the individual stages).
  • stage 3 a material bed roller mill is used, as stage 4 a hammer mill, as stage 5 a riser dryer, as stage 6.1 a deflector and as stage 6.2 a rotor sifter.
  • Level 7 is a cyclone.
  • the result is a mixed moisture of 11.6%, which is just below the limit moisture of 12%.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Disintegrating Or Milling (AREA)
  • Combined Means For Separation Of Solids (AREA)

Claims (10)

  1. Procédé de fragmentation de matière friable dans l'emprise de deux cylindres comprimés l'un contre l'autre avec une forte pression, un courant partiel de la matière ayant subi la fragmentation étant recyclé dans l'emprise des cylindres et sa fragmentation se poursuivant avec celle de matière fraîche, caractérisé en ce que, pour la fragmentation de matière contenant une humidité élevée et tendant fortement à s'empâter et/ou à coller au-dessus d'un taux d'humidité critique, au moins partie du courant partiel recyclé dans l'emprise des cylindres est suffisamment asséchée avant d'être réintroduite dans l'emprise des cylindres pour que l'humidité se règle dans l'emprise des cylindres à une moyenne qui est inférieure à la teneur critique en humidité.
  2. Procédé selon la revendication 1, caractérisé en ce que la matière ayant subi la fragmentation dans l'emprise des cylindres est tout d'abord désagglomérée et ensuite séchée.
  3. Procédé selon la revendication 1, caractérisé en ce que la matière ayant subi la fragmentation dans l'emprise des cylindres est tout d'abord séchée et ensuite désagglomérée.
  4. Procédé selon la revendication 1, caractérisé en ce que la matière ayant subi la fragmentation dans l'emprise des cylindres est séchée et désagglomérée simultanément.
  5. Procédé selon l'une des revendications 1 à 4, suivant lequel la matière ayant subi la fragmentation dans un broyeur à cylindres pour lit de matière est classée après le séchage et la désagglomération, caractérisé en ce que la totalité de la matière grossière provenant du classement est recyclée sur le broyeur à cylindres.
  6. Procédé selon la revendication 5, caractérisé en ce qu'une fraction de produit fini, de préférence une fraction de produit fini contenue dans un courant partiel de la matière séchée, mais pas encore classée, est aussi recyclée sur le broyeur à cylindres.
  7. Procédé selon la revendication 5, caractérisé en ce que le broyeur à cylindres pour lit de matière est exploité avec un niveau de transformation d'énergie suffisamment abaissé et le facteur de circulation en est ainsi suffisamment augmenté pour que l'humidité se règle, pour un séchage prédéterminé de la matière fragmentée dans l'emprise des cylindres, à une moyenne qui est inférieure à la teneur critique en humidité.
  8. Procédé selon la revendication 5, caractérisé en ce que le classement de la matière est effectué dans deux étages montés l'un derrière l'autre, la matière grossière provenant des deux étages de classement étant recyclée sur le broyeur à cylindres.
  9. Procédé selon la revendication 5, caractérisé en ce que le classement de la matière est effectué en deux courants partiels au moyen de deux étages de classement montés en parallèle, la matière grossière provenant des deux étages de classement étant recyclée sur le broyeur à cylindres.
  10. Installation de fragmentation de matière friable, comprenant
    a) un broyeur à cylindres (3) pour matière en lit, se composant de deux cylindres comprimés l'un contre l'autre avec une forte pression,
    b) un dispositif (6.1, 6.2 ; 6a, 6b) de classement de la matière ayant subi la fragmentation,
    c) un dispositif assurant l'envoi de matière fraîche et de la matière grossière provenant du dispositif de classement de la matière ayant subi la fragmentation sur le broyeur à cylindres (3),
       caractérisé par
    d) un dispositif (5) qui est destiné au séchage d'au moins une partie de la matière recyclée sur le broyeur à cylindres (3) et qui est disposé de préférence entre un dispositif (4) de désagglomération de la matière monté en aval du broyeur à cylindres (3) et le dispositif (6.1, 6.2 ; 6a, 6b) de classement de la matière.
EP88106819A 1987-05-27 1988-04-28 Procédé et installation de broyage pour matériau friable Expired - Lifetime EP0292724B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19873717975 DE3717975A1 (de) 1987-05-27 1987-05-27 Verfahren und anlage zur zerkleinerung von sproedem mahlgut
DE3717975 1987-05-27

Publications (3)

Publication Number Publication Date
EP0292724A2 EP0292724A2 (fr) 1988-11-30
EP0292724A3 EP0292724A3 (en) 1989-11-02
EP0292724B1 true EP0292724B1 (fr) 1991-09-18

Family

ID=6328598

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88106819A Expired - Lifetime EP0292724B1 (fr) 1987-05-27 1988-04-28 Procédé et installation de broyage pour matériau friable

Country Status (4)

Country Link
US (1) US4875628A (fr)
EP (1) EP0292724B1 (fr)
DE (2) DE3717975A1 (fr)
ES (1) ES2025723T3 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5076503A (en) * 1989-07-12 1991-12-31 Cook Robert L Size reduction processing apparatus for solid material
DE4028015A1 (de) * 1990-09-04 1992-03-05 Krupp Polysius Ag Verbesserung des einzugsverhaltens einer walzenmuehle
DE4126899A1 (de) * 1991-08-14 1993-02-18 Krupp Polysius Ag Verfahren und anlage zum zerkleinern von sproedem mahlgut
DE10336801B4 (de) * 2003-08-11 2015-02-12 Thyssenkrupp Industrial Solutions Ag Verfahren und Anlage zur Mahlung von Eisenerz bzw. Eisenerzkonzentrat
US7549315B2 (en) * 2007-09-28 2009-06-23 Sgs Lakefield Research, Ltd. Protocol for characterizing rock, method for characterizing rock hardness and methods for use therewith
DE102013100997A1 (de) 2013-01-31 2014-07-31 Thyssenkrupp Resource Technologies Gmbh 1;2Verfahren und Anlage zur Mahlung von stückigem Ausgangsmaterial

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2631204A1 (de) * 1975-08-04 1977-02-24 Dessau Zementanlagenbau Veb Verfahren und vorrichtung zur feinzerkleinerung von mineralien
DE1757093C3 (de) * 1968-03-29 1978-10-19 Alpine Ag, 8900 Augsburg Walzenmühle zur Feinmahlung

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3806046A (en) * 1972-08-18 1974-04-23 Cities Service Co Dry extraction and purification of phosphate pebbles from run-of-mine rock
US3951347A (en) * 1972-09-21 1976-04-20 Polysius Ag Apparatus for crushing material containing particles that are hard to pulverize
DE3334235A1 (de) * 1982-11-04 1984-05-10 Heinz 4630 Bochum Jäger Verfahren und vorrichtung zur energiesparenden herstellung eines feingutes, insbesondere zement
DE3302176A1 (de) * 1983-01-24 1984-07-26 Klöckner-Humboldt-Deutz AG, 5000 Köln Verfahren und anlage zur kontinuierlichen druckzerkleinerung sproeden mahlgutes
DE3518543C3 (de) * 1985-05-23 1996-12-19 Kloeckner Humboldt Deutz Ag Verfahren und Einrichtung zur Zerkleinerung bzw. Mahlung spröden Mahlgutes
DE3520069A1 (de) * 1985-06-04 1986-12-04 Krupp Polysius Ag, 4720 Beckum Verfahren und anlage zur zweistufigen zerkleinerung
DE3525936A1 (de) * 1985-07-19 1987-01-29 Krupp Polysius Ag Verfahren und anlage zur entwaesserung und zerkleinerung von mahlgut hoher feuchte
EP0220681B1 (fr) * 1985-10-29 1991-05-29 Klöckner-Humboldt-Deutz Aktiengesellschaft Installation pour fractionner et broyer des matériaux fragiles et mouillés

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1757093C3 (de) * 1968-03-29 1978-10-19 Alpine Ag, 8900 Augsburg Walzenmühle zur Feinmahlung
DE2631204A1 (de) * 1975-08-04 1977-02-24 Dessau Zementanlagenbau Veb Verfahren und vorrichtung zur feinzerkleinerung von mineralien

Non-Patent Citations (5)

* Cited by examiner, † Cited by third party
Title
DE-Zeitschrift "Zement-Kalk-Gips", Nr. 1, 1979, Seiten 1-9 *
DE-Zeitschrift "Zement-Kalk-Gips", Nr. 1, 1987, Seiten 1-6 *
DE-Zeitschrift "Zement-Kalk-Gips", Nr. 11, 1984, Seiten 563-568 *
US-Zeitschrift "World Cement", März 1985, Seiten 49-58 *
Vortrag: H. Wüstner "Fundamentals and Application of Interparticle Communition", 1986, Bombay *

Also Published As

Publication number Publication date
DE3864901D1 (de) 1991-10-24
EP0292724A2 (fr) 1988-11-30
US4875628A (en) 1989-10-24
EP0292724A3 (en) 1989-11-02
ES2025723T3 (es) 1992-04-01
DE3717975A1 (de) 1988-12-08

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