EP0272485B1 - Method and installation for the two-stage crushing of brittle material - Google Patents

Method and installation for the two-stage crushing of brittle material Download PDF

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Publication number
EP0272485B1
EP0272485B1 EP87117376A EP87117376A EP0272485B1 EP 0272485 B1 EP0272485 B1 EP 0272485B1 EP 87117376 A EP87117376 A EP 87117376A EP 87117376 A EP87117376 A EP 87117376A EP 0272485 B1 EP0272485 B1 EP 0272485B1
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Prior art keywords
mill
tailings
roll mill
delivered
fresh material
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Expired - Lifetime
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EP87117376A
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German (de)
French (fr)
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EP0272485A2 (en
EP0272485A3 (en
Inventor
Gotthardt Dipl.-Ing. Blasczyk
Norbert Dipl.-Ing. Patzelt
Heinz-Georg Dipl-Ing. Mersmann
Hardy Dipl-Ing. Kropf
Franz Josef Dipl.-Ing. Adrian
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ThyssenKrupp Industrial Solutions AG
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Krupp Polysius AG
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Publication of EP0272485A2 publication Critical patent/EP0272485A2/en
Publication of EP0272485A3 publication Critical patent/EP0272485A3/en
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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
    • B02C4/28—Details
    • B02C4/42—Driving mechanisms; Roller speed control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C25/00—Control arrangements specially adapted for crushing or disintegrating

Definitions

  • the invention relates to a method (according to the preamble of claim 1) and a system (according to the preamble of claim 4) for the two-stage comminution of brittle regrind.
  • the invention has for its object to provide a method according to the preamble of claim 1 and a system according to the preamble of claim 3 that results in the overall system as high as possible energy savings or the lowest possible work requirements for the crushing of the ground material.
  • the system shown for the two-stage comminution of brittle ground material for example cement clinker, contains a roller mill 1 and a second mill 2 connected downstream of the roller mill 1, which is preferably designed as a ball mill.
  • the system also contains a classifier 3 for classifying the material discharged from the second mill 2.
  • a measuring device 4 is provided for determining the amount of semolina produced during the screening.
  • a control flap 6 provided with a motor 5, which serves to divide the amount of semolina produced during the screening into a partial flow fed to the roller mill 1 and a partial flow fed to the second mill 2.
  • the ground material to be comminuted is located in storage containers 7, 8, 9 (which, for example, are assigned to individual components). It is fed to the roller mill 1 via metering belt scales 10, 11, 12.
  • the roller mill 1 contains 2 rollers 13, 14, of which the roller 13 is designed as a fixed roller and the roller 14 as a loose roller.
  • the two rollers pressed against each other at high pressure are driven by electric motors 15, 16 via gears 17, 18.
  • the measuring device 4 which determines the total amount of semolina produced during the sifting, is connected to a controller 22, which receives a signal from a summing element 23 which corresponds to the amount of fresh material just supplied (ie the sum of the withdrawals from the storage containers 7, 8, 9) Amount of regrind).
  • the controller 22 is connected to the drives of the dosing belt scales 10, 11, 12 via a switching element 24.
  • a second control circuit contains a measuring device 19 for determining the quantity of semolina fed to the roller mill 1, a computing element 20 and a regulator 21.
  • the first regulator 20 is supplied with a signal by the summing element 23 which corresponds to the current quantity of fresh material. He also receives a predetermined target value (26) for the sum of the quantity of fresh material and the quantity of semolina returned to the roller mill. From this, the computing element 20 forms a target value for the quantity of semolina returned to the roller mill. This setpoint is fed to the second controller 21.
  • the controller 21 receives a signal from the measuring device 19, which corresponds to the quantity of semolina returned to the roller mill 1. From this, the controller 21 forms a control signal which is fed to the servomotor 5 of the control flap 6.
  • the system also contains a device 25, which is likewise connected to the switching element 24, for monitoring the fill level of the second mill 2.
  • the function of the system is as follows: The regrind fed to the roller mill 1 is comminuted in the nip of the roller mill and, if the grain size is appropriate, is also comminuted individually. The agglomerates resulting from the comminution of the material bed are dissolved in the second mill 2. If necessary, the ground material in the second mill 2 undergoes further comminution.
  • the material discharged from the mill 2 is sighted in the sifter 3.
  • a partial flow of the roller mill 1 and a further partial flow of the mill 2 are fed from the resulting amount of semolina via the control flap 6.
  • the quantity of fresh material fed to the roller mill 1 via the metering belt scales 10, 11, 12 is dependent on the total amount of semolina obtained during the screening is regulated in such a way that the sum of the quantity of fresh material and the total amount of semolina of the mill 2 remains constant.
  • the amount of semolina obtained during the screening is divided between the partial streams fed to the roller mill 1 and the second mill 2 in such a way that the total amount of fresh material and the amount of semolina fed to the roller mill remains constant.
  • the roller mill 1 is therefore operated with a constant amount of material per unit time (t / h).
  • the roller mill 1 expediently runs at a constant speed.
  • the device 25 sends a signal to the switching element 24 and interrupts the above-described regulation of the quantity of fresh material depending on the total amount of semolina (ie the first control circuit) until the fill level of the mill 2 normalized again.

Description

Die Erfindung betrifft ein Verfahren (entsprechend dem Oberbegriff des Anspruches 1) sowie eine Anlage (gemäß dem Gattungsbegriff des Anspruches 4) zur zweistufigen Zerkleinerung von sprödem Mahlgut.The invention relates to a method (according to the preamble of claim 1) and a system (according to the preamble of claim 4) for the two-stage comminution of brittle regrind.

Ein Verfahren sowie eine Anlage dieser Art sind Gegenstand der deutschen Patentanmeldung P 35 20 069.3. Bei dieser älteren Lösung wird der der Walzenmühle zugeführte Teilstrom der Grießmenge so bemessen, daß im Füllschacht der Walzenmühle auch bei wechselnder Frischgutmenge ein nahezu konstanter Füllstand aufrechterhalten wird.A method and an installation of this type are the subject of German patent application P 35 20 069.3. In this older solution, the partial flow of the semolina quantity fed to the roller mill is dimensioned such that an almost constant filling level is maintained in the filling shaft of the roller mill even with changing quantities of fresh material.

Der Erfindung liegt die Aufgabe zugrunde, ein Verfahren entsprechend dem Oberbegriff des Anspruches 1 sowie eine Anlage gemäß dem Gattungsbegriff des Anspruches 3 so auszubilden, daß sich im Gesamtsystem eine möglichst hohe Energieeinsparung bzw. ein möglichst geringer spezifischer Arbeitsbedarf für die Zerkleinerung des Mahlgutes ergibt.The invention has for its object to provide a method according to the preamble of claim 1 and a system according to the preamble of claim 3 that results in the overall system as high as possible energy savings or the lowest possible work requirements for the crushing of the ground material.

Diese Aufgabe wird erfindungsgemäß durch die kennzeichnenden Merkmale des Anspruches 1 bzw. Anspruches 3 gelöst.This object is achieved by the characterizing features of claim 1 and claim 3.

Zweckmäßige Ausgestaltungen sind Gegenstand der Unteransprüche.Appropriate configurations are the subject of the subclaims.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung schematisch veranschaulicht.An embodiment of the invention is illustrated schematically in the drawing.

Die dargestellte Anlage zur zweistufigen Zerkleinerung von sprödem Mahlgut, beispielsweise von Zementklinker, enthält eine Walzenmühle 1 und eine der Walzenmühle 1 nachgeschaltete zweite Mühle 2, die vorzugsweise als Kugelmühle ausgebildet ist.The system shown for the two-stage comminution of brittle ground material, for example cement clinker, contains a roller mill 1 and a second mill 2 connected downstream of the roller mill 1, which is preferably designed as a ball mill.

Die Anlage enthält ferner einen Sichter 3 zur Sichtung des aus der zweiten Mühle 2 ausgetragenen Gutes.The system also contains a classifier 3 for classifying the material discharged from the second mill 2.

Weiterhin ist eine Meßeinrichtung 4 zur Ermittlung der bei der Sichtung anfallenden Grießmenge vorgesehen. An diese Meßeinrichtung 4 schließt sich eine mit einem Motor 5 versehene Stellklappe 6 an, die dazu dient, die bei der Sichtung angefallene Grießmenge in einen der Walzenmühle 1 zugeführten Teilstrom und einen der zweiten Mühle 2 zugeführten Teilstrom zu unterteilen.Furthermore, a measuring device 4 is provided for determining the amount of semolina produced during the screening. Connected to this measuring device 4 is a control flap 6 provided with a motor 5, which serves to divide the amount of semolina produced during the screening into a partial flow fed to the roller mill 1 and a partial flow fed to the second mill 2.

Das zu zerkleinernde Mahlgut befindet sich in Vorratsbehältern 7, 8, 9 (die beispielsweise einzelnen Komponenten zugeordnet sind). Es wird über Dosierbandwaagen 10, 11, 12 der Walzenmühle 1 zugeführt.The ground material to be comminuted is located in storage containers 7, 8, 9 (which, for example, are assigned to individual components). It is fed to the roller mill 1 via metering belt scales 10, 11, 12.

Die Walzenmühle 1 enthält 2 Walzen 13, 14, von denen die Walze 13 als Festwalze und die Walze 14 als Loswalze ausgebildet ist. Die beiden mit hohem Druck gegeneinander gepreßten Walzen werden durch Elektromotoren 15, 16 über Getriebe 17, 18 angetrieben.The roller mill 1 contains 2 rollers 13, 14, of which the roller 13 is designed as a fixed roller and the roller 14 as a loose roller. The two rollers pressed against each other at high pressure are driven by electric motors 15, 16 via gears 17, 18.

Die Meßeinrichtung 4, die die bei der Sichtung anfallende gesamte Grießmenge ermittelt, ist mit einem Regler 22 verbunden, der von einem Summierglied 23 ein Signal erhält, das der gerade zugeführten Frischgutmenge entspricht (d.h. der Summe der aus den Vorratsbehältern 7,8, 9 abgezogenen Mahlgutmenge). Der Regler 22 ist über ein Umschaltglied 24 mit den Antrieben der Dosierbandwaagen 10, 11, 12 verbunden.The measuring device 4, which determines the total amount of semolina produced during the sifting, is connected to a controller 22, which receives a signal from a summing element 23 which corresponds to the amount of fresh material just supplied (ie the sum of the withdrawals from the storage containers 7, 8, 9) Amount of regrind). The controller 22 is connected to the drives of the dosing belt scales 10, 11, 12 via a switching element 24.

Ein zweiter Regelkreis enthält eine Meßeinrichtung 19 zur Ermittlung der der Walzenmühle 1 zugeführten Grießmenge, ein Rechenglied 20 sowie einen Regler 21. Dem ersten Regler 20 wird vom Summierglied 23 ein Signal zugeführt, das der derzeitigen Frischgutmenge entspricht. Er erhält ferner einen vorgegebenen Sollwert(26) für die Summe von Frischgutmenge und zur Walzenmühle rückgeführter Grießmenge. Hieraus bildet das Rechenglied 20 einen Sollwert für die zur Walzenmühle rückgeführte Grießmenge. Dieser Sollwert wird dem zweiten Regler 21 zugeleitet.A second control circuit contains a measuring device 19 for determining the quantity of semolina fed to the roller mill 1, a computing element 20 and a regulator 21. The first regulator 20 is supplied with a signal by the summing element 23 which corresponds to the current quantity of fresh material. He also receives a predetermined target value (26) for the sum of the quantity of fresh material and the quantity of semolina returned to the roller mill. From this, the computing element 20 forms a target value for the quantity of semolina returned to the roller mill. This setpoint is fed to the second controller 21.

Der Regler 21 erhält außer diesem vom Rechenglied 20 gebildeten Sollwert ein Signal von der Meßeinrichtung 19, das der zur Walzenmühle 1 rückgeführten Grießmenge entspricht. Hieraus bildet der Regler 21 ein Regelsignal, das dem Stellmotor 5 der Stellklappe 6 zugeführt wird.In addition to this setpoint formed by the computing element 20, the controller 21 receives a signal from the measuring device 19, which corresponds to the quantity of semolina returned to the roller mill 1. From this, the controller 21 forms a control signal which is fed to the servomotor 5 of the control flap 6.

Schließlich enthält die Anlage noch eine gleichfalls mit dem Umschaltglied 24 verbundene Einrichtung 25 zur Überwachung des Füllstandes der zweiten Mühle 2.Finally, the system also contains a device 25, which is likewise connected to the switching element 24, for monitoring the fill level of the second mill 2.

Die Funktion der Anlage ist wie folgt:
Das der Walzenmühle 1 zugeführte Mahlgut erfährt im Spalt der Walzenmühle eine Gutbettzerkleinerung und bei entsprechender Korngröße zugleich eine Einzelkornzerkleinerung. Die bei der Gutbettzerkleinerung anfallenden Agglomerate werden in der zweiten Mühle 2 aufgelöst. Gegebenenfalls erfährt das Mahlgut in der zweiten Mühle 2 eine weitere Zerkleinerung.The function of the system is as follows:
The regrind fed to the roller mill 1 is comminuted in the nip of the roller mill and, if the grain size is appropriate, is also comminuted individually. The agglomerates resulting from the comminution of the material bed are dissolved in the second mill 2. If necessary, the ground material in the second mill 2 undergoes further comminution.

Das aus der Mühle 2 ausgetragene Gut wird im Sichter 3 gesichtet. Von der hierbei anfallenden Grießmenge wird über die Stellklappe 6 ein Teilstrom der Walzenmühle 1 und ein weiterer Teilstrom der Mühle 2 zugeführt.The material discharged from the mill 2 is sighted in the sifter 3. A partial flow of the roller mill 1 and a further partial flow of the mill 2 are fed from the resulting amount of semolina via the control flap 6.

Über einen ersten Regelkreis, der die Meßeinrichtung 4 und den Regler 22 enthält, wird die der Walzenmühle 1 über die Dosierbandwaagen 10, 11, 12 zugeführte Frischgutmenge in Abhängigkeit von der bei der Sichtung anfallenden gesamten Grießmenge so geregelt, daß die Summe von Frischgutmenge und gesamter Grießmenge der Mühle 2 konstant bleibt.Via a first control loop, which contains the measuring device 4 and the controller 22, the quantity of fresh material fed to the roller mill 1 via the metering belt scales 10, 11, 12 is dependent on the total amount of semolina obtained during the screening is regulated in such a way that the sum of the quantity of fresh material and the total amount of semolina of the mill 2 remains constant.

Über einen zweiten Regelkreis, der die Meßeinrichtung 19, die Stellklappe 6 sowie das Rechenglied 20 und den Regler 21 enthält, wird die bei der Sichtung anfallende Grießmenge auf die der Walzenmühle 1 und der zweiten Mühle 2 zugeführten Teilströme derart aufgeteilt, daß die Summe von Frischgutmenge und der Walzenmühle zugeführter Grießmenge konstant bleibt. Die Walzenmühle 1 wird daher mit konstanter Materialmenge pro Zeiteinheit (t/h) betrieben.Via a second control circuit, which contains the measuring device 19, the control flap 6 and the computing element 20 and the controller 21, the amount of semolina obtained during the screening is divided between the partial streams fed to the roller mill 1 and the second mill 2 in such a way that the total amount of fresh material and the amount of semolina fed to the roller mill remains constant. The roller mill 1 is therefore operated with a constant amount of material per unit time (t / h).

Zweckmäßig läuft die Walzenmühle 1 hierbei mit konstanter Drehzahl.The roller mill 1 expediently runs at a constant speed.

Überschreitet der Füllstand der Mühle 2 einen Höchstwert, so gibt die Einrichtung 25 ein Signal an das Umschaltglied 24 und unterbricht die vorstehend erläuterte, in Abhängigkeit der Gesamtgrießmenge erfolgende Regelung der Frischgutmenge (d. h. den ersten Regelkreis) so lange, bis sich der Füllstand der Mühle 2 wieder normalisiert hat.If the fill level of the mill 2 exceeds a maximum value, the device 25 sends a signal to the switching element 24 and interrupts the above-described regulation of the quantity of fresh material depending on the total amount of semolina (ie the first control circuit) until the fill level of the mill 2 normalized again.

Claims (4)

  1. Method of two-stage crushing of brittle material for grinding, in which
    a) first of all the material for grinding undergoes material bed crushing in the roll gap of a roll mill (1),
    b) the agglomerates formed during this operation are then broken up in a second mill (2) connected after the roll mill (1) and, if required, undergo further crushing,
    c) the material discharged from the second mill (2) is subjected to separating and of the quantity of tailings obtained in this operation one branch stream is delivered to the roll mill (1) and a further branch stream to the mill (2),
    d) the quantity of fresh material delivered to the roll mill (1) being regulated as a function of the total quantity of tailings obtained in the separating operation in such a way that the sum of the quantity of fresh material and the total quantity of tailings obtained during separation remains constant;
    characterised by the following features:
    e) the division of the quantity of tailings obtained in the separating operation and the distribution thereof to the roll mill (1) and the second mill (2) is carried out in such a way that the sum of the quantity of fresh material and the quantity of tailings delivered to the roll mill remains constant,
    f) the filling level of the second mill (2) is monitored and if a maximum value of this filling level is exceeded the control of the quantity of fresh material as a function of the total quantity of tailings is interrupted until the filling level of the second mill has returned to normal.
  2. Method as claimed in claim 1, characterised in that the roll mill (1) is driven at a constant speed.
  3. Apparatus for the two-stage crushing of brittle material for grinding, containing
    a) a roll mill (1),
    b) a second mill (2) connected after the roll mill (1),
    c) a separator (3) for separating the material discharged from the second mill (2),
    d) an arrangement for dividing the quantity of tailings obtained in the separating operation into one branch stream delivered to the roll mill (1) and one branch stream delivered to the second mill (2),
    e) a first control circuit which regulates the quantity of fresh material delivered to the roll mill (1) as a function of the total quantity of tailings obtained in the separating operation in such a way that the sum of the quantity of fresh material and the total quantity of tailings remains constant,
    characterised by the following further parts of the apparatus:
    f) a second control circuit which controls the arrangement (5, 6) for dividing up the quantity of tailings obtained in the separating operation in such a way that the sum of the quantity of fresh material and the quantity of tailings delivered to the roll mill (1) remains the same,
    g) an arrangement (25) for monitoring the filling level of the second mill (2),
    h) and a switching element (24) which when a maximum value for the filling level is exceeded interrupts the regulation of the quantity of fresh material carried out as a function of the total quantity of tailings until the filling level in the second mill has returned to normal.
  4. Apparatus as claimed in claim 3, characterised by the following elements of the second control circuit:
    a) a measuring arrangement (19) for determining the quantity of tailings delivered to the roll mill (1),
    b) a computing element (20) which forms a theoretical value for the quantity of tailings returned to the roll mill from the quantity of fresh material at that moment and a predetermined theoretical value for the sum of the quantity of fresh material and the quantity of tailings returned to the roll mill,
    c) a regulator (21) connected to the computing element (20) and the measuring arrangement (19) which from the theoretical value formed by the computing element (20) and the signal from the measuring arrangement (19) produces a control signal for the arrangement (5, 6) for dividing up the quantity of tailings obtained in the separating operation.
EP87117376A 1986-12-23 1987-11-25 Method and installation for the two-stage crushing of brittle material Expired - Lifetime EP0272485B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19863644342 DE3644342A1 (en) 1986-12-23 1986-12-23 METHOD AND SYSTEM FOR THE TWO-STAGE CRUSHING OF SPROEDEM GROUND MATERIAL
DE3644342 1986-12-23

Publications (3)

Publication Number Publication Date
EP0272485A2 EP0272485A2 (en) 1988-06-29
EP0272485A3 EP0272485A3 (en) 1989-08-16
EP0272485B1 true EP0272485B1 (en) 1992-09-30

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EP87117376A Expired - Lifetime EP0272485B1 (en) 1986-12-23 1987-11-25 Method and installation for the two-stage crushing of brittle material

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US (1) US4783012A (en)
EP (1) EP0272485B1 (en)
JP (1) JPS63166443A (en)
KR (1) KR950007584B1 (en)
BR (1) BR8707013A (en)
CA (1) CA1284975C (en)
DE (2) DE3644342A1 (en)
ES (1) ES2035020T3 (en)
IN (1) IN172197B (en)

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DE4425452A1 (en) * 1994-07-19 1996-01-25 Kloeckner Humboldt Deutz Ag Method of breaking down composite ground material

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DE3815217A1 (en) * 1988-05-04 1989-11-16 Pfeiffer Christian Maschf METHOD FOR CRUSHING SPROEDEM GROUND
DE3843338A1 (en) * 1988-12-22 1990-06-28 Krupp Polysius Ag SAFE
DE8916267U1 (en) * 1989-02-20 1996-08-08 Kloeckner Humboldt Deutz Ag Sifter for sifting granular material and grinding system with the activation of such a sifter
DE3921823A1 (en) * 1989-07-03 1991-01-17 Krupp Polysius Ag METHOD AND APPARATUS FOR MINING GRINDING
DE4005323A1 (en) * 1990-02-20 1991-08-22 Krupp Polysius Ag Crushing plant for cement material - involves first stage accepting pre-crushed material, and feeding to second stage with constant output regulation
DE4137199A1 (en) * 1991-11-12 1993-05-13 Krupp Polysius Ag METHOD FOR CONTROLLING A CIRCULATING MACHINE
DE4239602A1 (en) * 1992-11-25 1994-05-26 Krupp Polysius Ag Method and device for comminuting regrind
DE4337215A1 (en) * 1993-10-30 1995-05-04 Kloeckner Humboldt Deutz Ag Circulating grinding plant
DE4443479A1 (en) * 1994-12-07 1996-06-13 Kloeckner Humboldt Deutz Ag Circular grinding plant
DE29508598U1 (en) * 1995-05-31 1995-08-24 Siemens Ag Device for operating grinding plants in the cement industry
JP2000176688A (en) * 1998-12-16 2000-06-27 Matsushita Electric Ind Co Ltd Method for utilizing metallic waste product as casting material, apparatus therefor and casting material obtained with the apparatus
SE527086C2 (en) * 2004-05-13 2005-12-20 Procedo Entpr Etablissement Process system for producing a composite of cementite material with reduced carbon dioxide emissions
US7927417B2 (en) 2008-02-04 2011-04-19 Capitol Aggregates, Ltd. Cementitious composition and apparatus and method for manufacturing the same
EP2980036B1 (en) 2014-07-28 2018-04-25 HeidelbergCement AG Method of grinding cement clinker
CN107399975B (en) * 2017-07-07 2020-09-11 杭州富阳福士得食品有限公司 Be used for ceramic raw materials grinding equipment

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DE1168221B (en) * 1960-03-26 1964-04-16 Elmkalk Und Zementwerke J Schn Process for the automatic control of cement grinding plants with coarse and fine grinders
DE2160540C3 (en) * 1971-12-07 1980-03-20 Ruhrkohle Ag, 4300 Essen Process and device for dedusting hard coal in the wind sifter
SE410561B (en) * 1973-04-13 1979-10-22 Boliden Ab INSTALLATION FOR AUTOGEN OR SEMIAUTOGEN GRINDING OF PIECE MATERIAL, SPECIAL ORE
DE3302176A1 (en) * 1983-01-24 1984-07-26 Klöckner-Humboldt-Deutz AG, 5000 Köln METHOD AND SYSTEM FOR CONTINUOUS PRESSURE REDUCTION OF SPROEDEN GROUND MATERIAL
DE3407535A1 (en) * 1984-03-01 1985-09-05 Klöckner-Humboldt-Deutz AG, 5000 Köln Device for automatically controlling the throughput during the two-stage comminution of brittle materials
DE3506486A1 (en) * 1985-02-23 1986-08-28 Klöckner-Humboldt-Deutz AG, 5000 Köln DEVICE FOR CRUSHING AND GRINDING SPROEDEN GROUND MATERIALS, FOR EXAMPLE Cement clinker, ore, coal or the like
DE3520069A1 (en) * 1985-06-04 1986-12-04 Krupp Polysius Ag, 4720 Beckum METHOD AND PLANT FOR TWO-STAGE CRUSHING

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4425452A1 (en) * 1994-07-19 1996-01-25 Kloeckner Humboldt Deutz Ag Method of breaking down composite ground material

Also Published As

Publication number Publication date
DE3644342A1 (en) 1988-07-07
US4783012A (en) 1988-11-08
ES2035020T3 (en) 1993-04-16
CA1284975C (en) 1991-06-18
EP0272485A2 (en) 1988-06-29
KR880007129A (en) 1988-08-26
BR8707013A (en) 1988-08-09
EP0272485A3 (en) 1989-08-16
KR950007584B1 (en) 1995-07-12
JPS63166443A (en) 1988-07-09
DE3782016D1 (en) 1992-11-05
IN172197B (en) 1993-05-01

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