EP0648539A2 - Closed circuit grinding plant - Google Patents
Closed circuit grinding plant Download PDFInfo
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- EP0648539A2 EP0648539A2 EP94114845A EP94114845A EP0648539A2 EP 0648539 A2 EP0648539 A2 EP 0648539A2 EP 94114845 A EP94114845 A EP 94114845A EP 94114845 A EP94114845 A EP 94114845A EP 0648539 A2 EP0648539 A2 EP 0648539A2
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- Prior art keywords
- grinding
- fine
- classifier
- roller press
- circuit
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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
- B02C21/00—Disintegrating plant with or without drying of the material
Definitions
- the invention relates to a circulation grinding plant (circular grinding plant) with a high-pressure roller press with material bed comminution of the feed material and with a downstream disagglomerator / sifter, the size (coarse sifter) of which is recirculated to the roller press.
- a method for comminuting or grinding brittle material to be ground is known (EP-B-0 084 383, FIGS. 3 and 4), in which the material to be ground is pressed under high pressure in the nip of a high-pressure roller press, which in part leads to particle destruction and in part leads to the creation of cracks in the interior of the particle and is visibly expressed in the formation of agglomerates (so-called Schülpen).
- the individual particles of the material to be ground are crushed in the narrowest roller gap of the high-pressure roller press in a material bed, ie in a bed of material compressed between two surfaces, one speaks of the so-called material bed size reduction.
- the gut agglomerates coming from the high-pressure roller press can be disagglomerated or dissolved with comparatively little expenditure of energy, and they are then fed to a classifier, the size of which is completely recirculated to the high-pressure roller press.
- the agglomerates from the roller press already contain fine material that is extracted from the classifier of the closed-circuit grinding system together with the classifying air.
- this known finished grinding system which can produce a finished product without the ball mill being connected to the high-pressure roller press, is characterized by a high material circulation rate, i.e. the quantity of semolina recirculated from the classifier to the roll press is large, which makes a large classifier as well as a large high-pressure roller press, whose throughput in t / h is limited to a certain value in practice.
- the known rotary grinding plant is limited in the variation of the desired product quality such as grain size, grain distribution, etc. B. not simultaneously two differently fine finished products of the same good material such. B. Produce cement.
- the invention has for its object to provide an overall characterized by a low specific energy requirement using a high-pressure roller press system, which is very variable in terms of the product quality generated and z.
- B. is able to simultaneously produce at least two different fine finished product of the same good material, without high material circulation rates and the use of tube mills or other fine grinding mills are required.
- Characteristic of the rotary grinding plant according to the invention is the series connection of at least two grinding circuits, each of which comprises a high-pressure roller press and a classifier.
- the material cycle in the first grinding circuit is relieved in that the fines / middle goods drawn off from the classifier of the first grinding circuit are introduced into the second grinding circuit with or without the sifting air flow.
- So z. B. the withdrawn from the classifier of the first grinding cycle, the visual air flow, which is loaded with fine and medium material, introduced directly into the classifier of the second grinding circuit, the exhaust side Separator and induced draft fan is connected downstream.
- a partial flow can be discharged as a less fine finished product from the connecting line of the two grinding circuits, through which medium / fine material is transferred from the first grinding circuit into the two grinding circuit, e.g. B. with a fineness of 2800 cm2 / g measured according to Blaine, while the fine finished product is withdrawn from the classifier of the second grinding circuit, for. B. with a fineness of 4500 cm2 / g according to Blaine.
- the rotary grinding plant according to the invention With the rotary grinding plant according to the invention, at least two differently fine finished products of the same good material, such as e.g. B. Produce cement.
- the quality of the end product e.g. B. affect the grain distribution of the mixed product.
- differently fine cements with certain grain distributions and certain proportions of specific surfaces are indeed required, which results in the different cement qualities or types of cement.
- the rotary grinding plant according to the invention is able to meet these practical requirements with the lowest possible specific energy requirement.
- the rotary grinding plant according to the invention is also able to meet the requirement for high finished goods output in t / h and for high fineness of the end product (withdrawn from the second grinding cycle), as would not be possible with the installation of only a single bed-crushing high-pressure roller press.
- the two classifiers and high pressure roller presses can be optimized in their respective grinding circuits with regard to their operating conditions, e.g. B. with regard to the roll dimensions, roll surface structures, roll circumferential speeds, specific pressure in the roll gap, roll gap geometry, specific roll press operation due to fine material feed, solid loading of the visible air, etc.
- a further connecting line can be provided in the recirculating grinding system, through which a partial flow of the classifier from the first classifier to the first high-pressure roller press leads to the second high-pressure roller press (second grinding circuit) is led.
- this classifier connection line the first grinding circuit can be relieved in a targeted manner with a certain amount of semolina and the second grinding circuit can be specifically loaded with this amount of semolina.
- the circulation grinding system is composed of two grinding circuits connected in series, of which the first grinding circuit is a high-pressure roller press (10) with a downstream disagglomerator / sifter (11) and the second grinding circuit is also a high-pressure roller press (12) with a downstream disagglomerator / sifter (13).
- Both roller presses each have two rotatably mounted, counter-rotating rollers that are separated from one another by a press roll nip.
- Fresh produce (14) e.g. B. not pre-shredded cement clinker
- the roller press (10) is given up and subjected to a combined single grain shredding and material bed shredding.
- the material comminuted in the narrowest nip by comminution of the material bed emerges from the nip and comminuted and, if necessary, partially agglomerated, ie pressed into flakes (15), the proportion of particles of the cement to be produced which have already been reduced to the desired fineness.
- the slugs (15) are preferably dynamic via the conveyor or line (16) Sifter (11) is abandoned, which can be equipped in its upper area with an impact crusher (17), in which the flake material (15) is deagglomerated before it enters the classifying area of the sifter (11).
- an impact crusher (17) in which the flake material (15) is deagglomerated before it enters the classifying area of the sifter (11).
- fine material / middle class (19) is separated from the disagglomerated good together with the classifier exhaust air, while the coarse grain fraction (20) [large size] leaving the classifier (11) goes to the roller press ( 10) is recirculated. It is also possible to feed at least a partial flow of the fresh material to the first grinding circuit instead of (14) at (21).
- the fines / medium extraction line (19) from the classifier (11) of the first grinding circuit leads together with the classifying air to the classifier (13) of the second grinding circuit, in which the fine material (22) is separated from the medium (23), the latter the high-pressure roller press (12) for material bed comminution is fed, from which the Schülpenmaterial (24) via the conveyor or line (25) to the deagglomeration stage (26) of the classifier (13) is recirculated.
- a good part flow as a second less fine finished product (B) with a fineness of can be obtained via branch lines (32) and separators (33) e.g. B. 2800 cm2 / g measured according to Blaine can be discharged, wherein the separator (33) leaving exhaust air flow can be fed back at least in part into the connecting line (19) via induced draft fan and line (34).
- the desired different cement qualities can be produced by mixing the finished products (A and B), it also being possible to influence the desired particle size distribution in the finished product.
- the connecting line (19) there between the two grinding circuits is replaced by a connecting line (35) in which the fine / medium material is conveyed to the second grinding circuit, which in a separator (11 ) downstream separator (36) has been separated from the classifier exhaust air (37), which is recirculated to the classifier (11) in a separate circuit by a separate suction fan (38).
- the fine material / medium (35) from the first grinding circuit is introduced via line (39 and / or 40) into the second grinding circuit, specifically into the material supply line and / or into the material extraction line of the deagglomerator / classifier (26, 13).
- the classifier (13) of the second grinding circuit is also equipped with its own classifying air recirculation line (41), the classifying air recirculation being accomplished by the induced draft fan (28).
- the finished products (A and B) obtained simultaneously can also be mixed with one another in order to produce very specific desired finished product qualities. Otherwise, the same parts in the exemplary embodiments of FIGS. 1, 2 and 3 are provided with the same reference numbers.
Abstract
Description
Die Erfindung betrifft eine Umlaufmahlanlage (Kreislaufmahlanlage) mit einer Hochdruck-Walzenpresse mit Gutbettzerkleinerung des Aufgabegutes und mit nachgeschaltetem Desagglomerator/Sichter, dessen Grieße (Sichtergrobgut) zur Walzenpresse rezirkuliert werden.The invention relates to a circulation grinding plant (circular grinding plant) with a high-pressure roller press with material bed comminution of the feed material and with a downstream disagglomerator / sifter, the size (coarse sifter) of which is recirculated to the roller press.
Man hat in den letzten Jahren erhebliche Anstrengungen unternommen, Rohrmühlen bzw. Kugelmühlen durch andere Mahlprozesse möglichst vollständig zu ersetzen. So ist ein Verfahren zur Zerkleinerung bzw. Mahlung spröden Mahlgutes bekannt (EP-B-0 084 383, Fig. 3 und 4), bei dem das Mahlgut im Walzenspalt einer Hochdruck-Walzenpresse unter hohem Druck gepreßt wird, was teils zur Partikelzerstörung, teils zur Erzeugung von Anrissen im Partikelinneren führt und sich sichtbar in der Bildung von Agglomeraten (sogenannten Schülpen) äußert. Weil die einzelnen Partikel des Mahlgutes im Bereich des engsten Walzenspältes der Hochdruck-Walzenpresse in einem Gutbett, d. h. in einer zwischen zwei Flächen zusammengedrückten Materialschüttung gegenseitig zerquetscht werden, spricht man hierbei von der sogenannten Gutbettzerkleinerung. Die aus der Hochdruck-Walzenpresse kommenden Gutagglomerate lassen sich mit vergleichsweise geringem Energieaufwand desagglomerieren bzw. auflösen und sie werden dann einem Sichter aufgegeben, dessen Grieße vollständig zur Hochdruck-Walzenpresse rezirkuliert werden. Infolge der Anwendung des hohen Preßdruckes in der Hochdruck-Walzenpresse und der Zerstörung des Korngefüges enthalten die aus der Walzenpresse kommenden Gutagglomerate bereits fertig feines Gut, das aus dem Sichter der Kreislaufmahlanlage zusammen mit der Sichtluft abgezogen wird. Dieses bekannte Fertigmahlsystem, das ein Fertigprodukt herstellen kann, ohne daß der Hochdruck-Walzenpresse eine Kugelmühle nachgeschaltet ist, ist allerdings durch eine hohe Gutkreislaufrate gekennzeichnet, d. h. die vom Sichter zur Walzenpresse rezirkulierte Grießemenge ist groß, was einen groß gebauten Sichter sowie eine große Hochdruck-Walzenpresse bedingt, deren Durchsatzleistung in t/h in der Praxis aber auf einen bestimmten Wert begrenzt ist. Außerdem ist die bekannte Umlaufmahlanlage in der Variierung der jeweils gewünschten Produktqualität wie Kornfeinheit, Kornverteilung etc. beschränkt, es lassen sich z. B. nicht gleichzeitig zwei verschieden feine Fertigprodukte desselben Gutmaterials wie z. B. Zements herstellen.In recent years, considerable efforts have been made to replace tube mills or ball mills as completely as possible with other grinding processes. A method for comminuting or grinding brittle material to be ground is known (EP-B-0 084 383, FIGS. 3 and 4), in which the material to be ground is pressed under high pressure in the nip of a high-pressure roller press, which in part leads to particle destruction and in part leads to the creation of cracks in the interior of the particle and is visibly expressed in the formation of agglomerates (so-called Schülpen). Because the individual particles of the material to be ground are crushed in the narrowest roller gap of the high-pressure roller press in a material bed, ie in a bed of material compressed between two surfaces, one speaks of the so-called material bed size reduction. The gut agglomerates coming from the high-pressure roller press can be disagglomerated or dissolved with comparatively little expenditure of energy, and they are then fed to a classifier, the size of which is completely recirculated to the high-pressure roller press. As a result of the application of the high pressure in the high-pressure roller press and the destruction of the grain structure, the agglomerates from the roller press already contain fine material that is extracted from the classifier of the closed-circuit grinding system together with the classifying air. However, this known finished grinding system, which can produce a finished product without the ball mill being connected to the high-pressure roller press, is characterized by a high material circulation rate, i.e. the quantity of semolina recirculated from the classifier to the roll press is large, which makes a large classifier as well as a large high-pressure roller press, whose throughput in t / h is limited to a certain value in practice. In addition, the known rotary grinding plant is limited in the variation of the desired product quality such as grain size, grain distribution, etc. B. not simultaneously two differently fine finished products of the same good material such. B. Produce cement.
Es ist auch bekannt (DE-A-39 19 416), zwei Gutbettzerkleinetungs-Hochdruck-Walzenpressen parallel zu schalten, in den beiden Walzenpressen unterschiedliche mahlbare bzw. unterschiedlich harte Gutmaterialien wie Zementrohmehlkomponenten zu behandeln und die Gutausträge beider Walzenpressen zu einem gemeinsamen Sichter zu führen, aus dem ein einziges Fertigprodukt wie z. B. Zementrohmehl abgezogen wird. Auch mit dieser Umlaufmahlanlage ist es nicht möglich, z. B. gleichzeitig zwei verschieden feine Fertiggprodukte ein und desselben Gutmaterials herzustellen.It is also known (DE-A-39 19 416) to connect two high-pressure material bed crushing high-pressure roller presses in parallel, to treat different grindable or hard materials such as cement raw meal components in the two roller presses, and to guide the material discharges from both roller presses to a common classifier , from which a single finished product such. B. raw cement flour is withdrawn. Even with this rotary grinding plant, it is not possible, e.g. B. Simultaneously produce two different fine finished products of the same good material.
Der Erfindung liegt die Aufgabe zugrunde, eine insgesamt durch einen niedrigen spezifischen Energiebedarf gekennzeichnete Umlaufmahlanlage mit Anwendung eines Hochdruck-Walzenpressensystems zu schaffen, das hinsichtlich der erzeugten Produktqualität sehr variierbar ist und das z. B. in der Lage ist, gleichzeitig wenigstens zwei verschieden feine Fertigproduktes desselben Gutmaterials herzustellen, ohne daß hohe Gutkreislaufraten und der Einsatz von Rohrmühlen oder anderen Feinzerkleinerungsmühlen erforderlich sind.The invention has for its object to provide an overall characterized by a low specific energy requirement using a high-pressure roller press system, which is very variable in terms of the product quality generated and z. B. is able to simultaneously produce at least two different fine finished product of the same good material, without high material circulation rates and the use of tube mills or other fine grinding mills are required.
Diese Aufgabe wird gemäß der Erfindung mit den Maßnahmen des Kennzeichnungsteils des Anspruchs 1 gelöst.This object is achieved according to the invention with the measures of the characterizing part of claim 1.
Charakteristisch für die erfindungsgemäße Umlaufmahlanlage ist die Hintereinanderschaltung wenigstens zweier Mahlkreisläufe, von denen jeder eine Hochdruck-Walzenpresse und einen Sichter umfaßt. Der Gutkreislauf im ersten Mahlkreislauf wird dadurch entlastet, daß das aus dem Sichter des ersten Mahlkreislaufes abgezogene Feingut/Mittelgut mit oder ohne dem Sichtluftstrom in den zweiten Mahlkreislauf eingebracht wird. So wird z. B. der aus dem Sichter des ersten Mahlkreislaufes abgezogene Sichtluftstrom, der mit Feingut und Mittelgut beladen ist, direkt in den Sichter des zweiten Mahlkreislaufes eingeführt, dem abluftseitig ein Abscheider und Saugzuggebläse nachgeschaltet ist. Es besteht aber auch die Möglichkeit, aus dem aus dem Sichter des ersten Mählkreislaufs abgezogenen Sichtluftstrom mittels eines Abscheiders das Feingut/Mittelgut abzutrennen und dieses in den zweiten Mahlkreislauf einzuführen, und zwar im Gutkreislauf des zweiten Mahlkreislaufes gesehen vor und/oder nach dem in diesem Kreislauf eingeschalteten Sichter. Jedenfalls kann aus der Verbindungsleitung der beiden Mahlkreisläufe, durch welche Mittelgut/Feingut aus dem ersten Mahlkreislauf in den zwei Mahlkreislauf überführt wird, ein Teilstrom als weniger feines Fertigprodukt ausgeschleust werden, z. B. mit einer Feinheit von 2800 cm²/g gemessen nach Blaine, während des feine Fertigprodukt aus dem Sichter des zweiten Mahlkreislaufs abgezogen wird, z. B. mit einer Feinheit von 4500 cm²/g nach Blaine. Mit der erfindungsgemäßen Umlaufmahlanlage lassen sich also mit niedrigem spezifischen Gesamtenergiebedarf gleichzeitig wenigstens zwei verschieden feine Fertigprodukte desselben Gutmaterials wie z. B. Zement herstellen. Durch Vermischung der beiden Fertigprodukte in bestimmten Mischungsverhältnissen läßt sich auch noch die Qualität des Endproduktes, z. B. die Kornverteilung des Mischproduktes beeinflussen. In der Praxis werden in der Tat verschieden feine Zemente mit bestimmten Kornverteilungen und bestimmten Anteilen von spezifischen Oberflächen benötigt, woraus sich die verschiedenen Zementqualitäten bzw. Zementsorten ergeben. Die erfindungsgemäße Umlaufmahlanlage ist in der Lage, diesen Anforderungen der Praxis mit möglichst geringem spezifischen Energiebedarf Rechnung zu tragen.Characteristic of the rotary grinding plant according to the invention is the series connection of at least two grinding circuits, each of which comprises a high-pressure roller press and a classifier. The material cycle in the first grinding circuit is relieved in that the fines / middle goods drawn off from the classifier of the first grinding circuit are introduced into the second grinding circuit with or without the sifting air flow. So z. B. the withdrawn from the classifier of the first grinding cycle, the visual air flow, which is loaded with fine and medium material, introduced directly into the classifier of the second grinding circuit, the exhaust side Separator and induced draft fan is connected downstream. However, there is also the possibility of separating the fine / middle goods from the classifying air stream drawn from the classifier of the first grinding circuit and introducing them into the second grinding circuit, namely before and / or after in the circulation of the second grinding circuit switched on sifter. In any case, a partial flow can be discharged as a less fine finished product from the connecting line of the two grinding circuits, through which medium / fine material is transferred from the first grinding circuit into the two grinding circuit, e.g. B. with a fineness of 2800 cm² / g measured according to Blaine, while the fine finished product is withdrawn from the classifier of the second grinding circuit, for. B. with a fineness of 4500 cm² / g according to Blaine. With the rotary grinding plant according to the invention, at least two differently fine finished products of the same good material, such as e.g. B. Produce cement. By mixing the two finished products in certain mixing ratios, the quality of the end product, e.g. B. affect the grain distribution of the mixed product. In practice, differently fine cements with certain grain distributions and certain proportions of specific surfaces are indeed required, which results in the different cement qualities or types of cement. The rotary grinding plant according to the invention is able to meet these practical requirements with the lowest possible specific energy requirement.
Die erfindungsgemäße Umlaufmahlanlage ist außerdem in der Lage, dem Erfordernis nach hohen Fertiggutleistungen in t/h sowie nach hohen Feinheitsgraden des (aus dem zweiten Mahlkreislauf abgezogenen) Endproduktes Rechnung zu tragen, wie es mit der Installierung nur einer einzigen GutbettzerkleinerungsHochdruck-Walzenpresse nicht möglich wäre. Die beiden Sichter und Hochdruck-Walzenpressen können in ihren jeweiligen Mahlkreisläufen hinsichtlich ihrer Betriebsbedingungen jeweils optimiert werden, z. B. hinsichtlich der Walzendimensionen, Walzenoberflächenstrukturen, Walzenumfangsgeschwindigkeiten, spezifischer Druck im Walzenspalt, Walzenspaltgeometrie, spezifischer Walzenpressenbetrieb wegen feiner Materialaufgabe, Feststoffbeladungsgrad der Sichtluft usw..The rotary grinding plant according to the invention is also able to meet the requirement for high finished goods output in t / h and for high fineness of the end product (withdrawn from the second grinding cycle), as would not be possible with the installation of only a single bed-crushing high-pressure roller press. The two classifiers and high pressure roller presses can be optimized in their respective grinding circuits with regard to their operating conditions, e.g. B. with regard to the roll dimensions, roll surface structures, roll circumferential speeds, specific pressure in the roll gap, roll gap geometry, specific roll press operation due to fine material feed, solid loading of the visible air, etc.
Nach einem weiteren Merkmal der Erfindung kann bei der Umlaufmahlanlage außer der die beiden Sichter der beiden Mahlkreisläufe verbindenden Verbindungsleitung eine weitere Verbindungsleitung vorgesehen sein, durch welche ein Teilstrom der vom ersten Sichter zur ersten Hochdruck-Walzenpresse geführten Sichtergrieße zur zweiten Hochdruck-Walzenpresse (zweiter Mahlkreislauf) geführt ist. Mittels dieser Sichtergrießeverbindungsleitung kann der erste Mahlkreislauf mit einer bestimmten Grießemenge gezielt entlastet und mit dieser Grießemenge der zweite Mahlkreislauf gezielt belastet werden.According to a further feature of the invention, in addition to the connecting line connecting the two classifiers of the two grinding circuits, a further connecting line can be provided in the recirculating grinding system, through which a partial flow of the classifier from the first classifier to the first high-pressure roller press leads to the second high-pressure roller press (second grinding circuit) is led. By means of this classifier connection line, the first grinding circuit can be relieved in a targeted manner with a certain amount of semolina and the second grinding circuit can be specifically loaded with this amount of semolina.
Die Erfindung und deren weitere Merkmale und Vorteile werden anhand der in den Figuren schematisch dargestellten Ausführungsbeispiele näher erläutert.The invention and its further features and advantages are explained in more detail with reference to the exemplary embodiments shown schematically in the figures.
Es zeigt:
- Fig. 1:
- die erfindungsgemäße Umlaufmahlanlage mit zwei hintereinandergeschalteten Mahlkreisläufen in einer ersten Schaltungsanordnung;
- Fig. 2:
- die Umlaufmahlanlage der Fig. 1 in einer zweiten Schaltungsanordnung, und
- Fig. 3:
- die Umlaufmahlanlage der Fig. 1 in einer dritten Schaltungsanordnung.
- Fig. 1:
- the rotary grinding plant according to the invention with two grinding circuits connected in series in a first circuit arrangement;
- Fig. 2:
- 1 in a second circuit arrangement, and
- Fig. 3:
- 1 in a third circuit arrangement.
Nach Fig. 1 ist die Umlaufmahlanlage aus zwei hintereinandergeschalteten Mahlkreisläufen zusammengesetzt, von denen der erste Mahlkreislauf eine Hochdruck-Walzenpresse (10) mit nachgeschaltetem Desagglomerator/Sichter (11) und der zweite Mahlkreislauf ebenfalls eine Hochdruck-Walzenpresse (12) mit nachgeschaltetem Desagglomerator/Sichter (13) aufweisen. Beide Walzenpressen weisen jeweils zwei drehbar gelagerte, gegenläufig rotierbare und durch einen Preßwalzenspalt voneinander getrennte Walzen auf. Frischgut (14), z. B. nicht vorzerkleinerter Zementklinker, wird der Walzenpresse (10) aufgegeben und dort einer kombinierten Einzelkornzerkleinerung und Gutbettzerkleinerung unterzogen. Das im engsten Walzenspalt durch Gutbettzerkleinerung zerkleinerte Gut tritt aus dem Walzenspalt zerkleinert und gegebenenfalls teilweise agglomeriert, d. h. zu Schülpen (15) gepreßt aus, deren Anteil an bereits bis zur gewünschten Feinheit reduzierter Partikel des herzustellenden Zementes relativ hoch sein kann. Die Schülpen (15) werden über Transporteur bzw. Leitung (16) dem vorzugsweise dynamischen Sichter (11) aufgegeben, der in seinem oberen Bereich mit einem Prallzerkleinerer (17) ausgerüstet sein kann, in welchem das Schülpenmaterial (15) desagglomeriert wird, bevor es in den Sichtraum des Sichters (11) eintritt. Es besteht aber auch die Möglichkeit, dem Sichter (11) einen externen separaten Desagglomerator vorzuschalten. In dem mit eingeführter Sichtluft (18) betriebenen Sichter (11) wird aus dem desagglomerierten Gut Feingut/Mittelgut (19) zusammen mit der Sichterabluft abgeschieden, während die den Sichter (11) verlassende grobe Kornfraktion (20) [grobe Grieße] zur Walzenpresse (10) rezirkuliert wird. Es besteht auch die Möglichkeit, wenigstens einen Teilstrom des Frischgutes statt bei (14) bei (21) dem ersten Mahlkreislauf zuzuführen.According to Fig. 1, the circulation grinding system is composed of two grinding circuits connected in series, of which the first grinding circuit is a high-pressure roller press (10) with a downstream disagglomerator / sifter (11) and the second grinding circuit is also a high-pressure roller press (12) with a downstream disagglomerator / sifter (13). Both roller presses each have two rotatably mounted, counter-rotating rollers that are separated from one another by a press roll nip. Fresh produce (14), e.g. B. not pre-shredded cement clinker, the roller press (10) is given up and subjected to a combined single grain shredding and material bed shredding. The material comminuted in the narrowest nip by comminution of the material bed emerges from the nip and comminuted and, if necessary, partially agglomerated, ie pressed into flakes (15), the proportion of particles of the cement to be produced which have already been reduced to the desired fineness. The slugs (15) are preferably dynamic via the conveyor or line (16) Sifter (11) is abandoned, which can be equipped in its upper area with an impact crusher (17), in which the flake material (15) is deagglomerated before it enters the classifying area of the sifter (11). However, there is also the option of connecting an external, separate deagglomerator to the classifier (11). In the classifier (11) operated with introduced classifying air (18), fine material / middle class (19) is separated from the disagglomerated good together with the classifier exhaust air, while the coarse grain fraction (20) [large size] leaving the classifier (11) goes to the roller press ( 10) is recirculated. It is also possible to feed at least a partial flow of the fresh material to the first grinding circuit instead of (14) at (21).
Die Feingut-/Mittelgut-Abzugsleitung (19) aus dem Sichter (11) des ersten Mahlkreislaufs führt zusammen mit der Sichtluft zum Sichter (13) des zweiten Mahlkreislaufs, in welchem das Feingut (22) vom Mittelgut (23) getrennt wird, welch letzteres der Hochdruck-Walzenpresse(12) zur Gutbettzerkleinerung zugeführt wird, aus der das Schülpenmaterial (24) über Transporteur bzw. Leitung (25) zur Desagglomerierstufe (26) des Sichters (13) rezirkuliert wird.The fines / medium extraction line (19) from the classifier (11) of the first grinding circuit leads together with the classifying air to the classifier (13) of the second grinding circuit, in which the fine material (22) is separated from the medium (23), the latter the high-pressure roller press (12) for material bed comminution is fed, from which the Schülpenmaterial (24) via the conveyor or line (25) to the deagglomeration stage (26) of the classifier (13) is recirculated.
Im Abscheider (27) wird das in der Sichterabluft enthaltene Feingut als Fertigprodukt (A) mit einer Feinheit von z. B. 4500 cm²/g gemessen nach Blaine von der Sichterabluft abgetrennt, die über ein Saugzuggebläse (28) abgezogen und über Leitung (29, 18) zum Sichter (11) des ersten Mahlkreislaufs rezirkuliert wird. Es besteht auch die Möglichkeit, den Sichter (13) des zweiten Mahlkreislaufs über die Leitungen (30, 31) mit einer eigenen/zusätzlichen Sichtluft zu versorgen. Aus der Verbindungsleitung (19) der beiden Mahlkreisläufe zur Überführung des aus dem Sichter (11) des ersten Mahlkreislaufs abgezogenen Feinguts/Mittelguts kann über Abzweigleitungen (32) und Abscheider (33) ein Gutteilstrom als zweites weniger feines Fertigprodukt (B) mit einer Feinheit von z. B. 2800 cm²/g gemessen nach Blaine ausgeschleust werden, wobei der den Abscheider (33) verlassende Abluftstrom über Saugzuggebläse und Leitung (34) wenigstens zum Teil wieder in die Verbindungsleitung (19) eingespeist werden kann. Durch Vermischung der Fertigprodukte (A und B) sind gewünschte verschiedene Zementqualitäten herstellbar, wobei auch noch Einfluß auf die jeweils gewünschte Kornverteilung im Fertigprodukt genommen werden kann.In the separator (27), the fines contained in the classifier exhaust air as finished product (A) with a fineness of z. B. 4500 cm² / g measured according to Blaine separated from the classifier exhaust air, which is drawn off via a suction fan (28) and recirculated via line (29, 18) to classifier (11) of the first grinding circuit. It is also possible to supply the classifier (13) of the second grinding circuit with its own / additional classifying air via the lines (30, 31). From the connecting line (19) of the two grinding circuits for transferring the fines / middle goods withdrawn from the classifier (11) of the first grinding circuit, a good part flow as a second less fine finished product (B) with a fineness of can be obtained via branch lines (32) and separators (33) e.g. B. 2800 cm² / g measured according to Blaine can be discharged, wherein the separator (33) leaving exhaust air flow can be fed back at least in part into the connecting line (19) via induced draft fan and line (34). The desired different cement qualities can be produced by mixing the finished products (A and B), it also being possible to influence the desired particle size distribution in the finished product.
Beim Ausführungsbeispiel der Fig. 2 ist im Unterschied zur Fig. 1 die dortige Verbindungsleitung (19) zwischen den beiden Mahlkreisläufen durch eine Verbindungsleitung (35) ersetzt, in der das Feingut/Mittelgut zum zweiten Mahlkreislauf gefördert wird, welches in einem dem Sichter (11) nachgeschalteten Abscheider (36) von der Sichterabluft (37) abgetrennt worden ist, die von einem eigenen Saugzuggebläse (38) in einem eigenen Kreislauf zum Sichter (11) rezirkuliert wird. Das Feingut/Mittelgut (35) aus dem ersten Mahlkreislauf wird über Leitung (39 und/oder 40) in den zweiten Mahlkreislauf eingeführt, und zwar in die Gutzuführungsleitung und/oder in die Gutabzugsleitung des Desagglomerators/Sichters (26, 13). Der Sichter (13) des zweiten Mahlkreislaufs ist ebenfalls mit einer eigenen Sichtluftrezirkulierungsleitung (41) ausgestattet, wobei die Sichtluftrezirkulierung vom Saugzuggebläse (28) bewerkstelligt wird. Auch beim Ausführungsbeispiel der Fig. 2 können die gleichzeitig gewonnenen Fertigprodukte (A und B) jeweils miteinander vermischt werden, um ganz bestimmte gewünschte Fertigproduktqualitäten zu erzeugen. Im übrigen sind gleiche Teile bei den Ausführungsbeispielen der Fig. 1, 2 sowie auch 3 mit gleichen Bezugsziffern versehen.In the exemplary embodiment in FIG. 2, in contrast to FIG. 1, the connecting line (19) there between the two grinding circuits is replaced by a connecting line (35) in which the fine / medium material is conveyed to the second grinding circuit, which in a separator (11 ) downstream separator (36) has been separated from the classifier exhaust air (37), which is recirculated to the classifier (11) in a separate circuit by a separate suction fan (38). The fine material / medium (35) from the first grinding circuit is introduced via line (39 and / or 40) into the second grinding circuit, specifically into the material supply line and / or into the material extraction line of the deagglomerator / classifier (26, 13). The classifier (13) of the second grinding circuit is also equipped with its own classifying air recirculation line (41), the classifying air recirculation being accomplished by the induced draft fan (28). In the embodiment of FIG. 2, the finished products (A and B) obtained simultaneously can also be mixed with one another in order to produce very specific desired finished product qualities. Otherwise, the same parts in the exemplary embodiments of FIGS. 1, 2 and 3 are provided with the same reference numbers.
Bei der erfindungsgemäßen Umlaufmahlanlage gemäß Ausführungsbeispiel der Fig. 3 ist eine die beiden Mahlkreisläufe verbindende zusätzliche Verbindungsleitung (42) vorhanden, durch welche ein Teilstrom der vom ersten Sichter (11) zur ersten Hochdruck-Walzenpresse (10) geführten Sichtergrieße (20) [grobe Grieße] durch Zusammenführung mit den Grießen (23) aus dem zweiten Sichter (13) über Leitung (43) zur zweiten Hochdruck-Walzenpresse (12) geführt wird. Mit dieser Lösung kann auch auf jeweils gewünschte Gutkreislaufraten sowie Kornverteilungen im Aufgabegut für optimiertes Laufverhalten der Walzenpresse im ersten Mahlkreislauf sowie auch im zweiten Mahlkreislauf gezielt Einfluß genommen werden.3, there is an additional connecting line (42) connecting the two grinding circuits, through which a partial flow of the classifier (20) from the first classifier (11) to the first high-pressure roller press (10) [coarse size ] by merging with the semolina (23) from the second classifier (13) via line (43) to the second high-pressure roller press (12). This solution can also be used to influence the desired material circulation rates and grain distributions in the feed material for optimized running behavior of the roller press in the first grinding circuit and also in the second grinding circuit.
Es wäre auch möglich, die beiden Mahlkreisläufe noch dadurch miteinander zu verbinden, daß sie durch einen gemeinsamen Desagglomerator/Sichter verknüpft sind, der als Multifraktionssichter bzw. Mehrproduktensichter wie z. B. Dreiproduktensichter oder Vierproduktensichter ausgebildet sein kann.It would also be possible to connect the two grinding circuits with one another in that they are linked by a common deagglomerator / sifter, which is used as a multifraction sifter or multi-product sifter such. B. three-product classifier or four-product classifier can be formed.
Claims (3)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4334904 | 1993-10-13 | ||
| DE4334904A DE4334904A1 (en) | 1993-10-13 | 1993-10-13 | Circulating grinding plant |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| EP0648539A2 true EP0648539A2 (en) | 1995-04-19 |
| EP0648539A3 EP0648539A3 (en) | 1995-10-11 |
| EP0648539B1 EP0648539B1 (en) | 1999-07-07 |
Family
ID=6500062
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP94114845A Expired - Lifetime EP0648539B1 (en) | 1993-10-13 | 1994-09-21 | Closed circuit grinding plant |
Country Status (3)
| Country | Link |
|---|---|
| EP (1) | EP0648539B1 (en) |
| DE (2) | DE4334904A1 (en) |
| DK (1) | DK0648539T3 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015078787A1 (en) * | 2013-11-26 | 2015-06-04 | Khd Humboldt Wedag Gmbh | Method for producing cement |
| CN106622600A (en) * | 2017-01-20 | 2017-05-10 | 长沙万荣粉体设备科技有限公司 | Powder grinding device |
| CN108097364A (en) * | 2018-01-31 | 2018-06-01 | 徐州至信建材机械有限公司 | A kind of novel concrete industrial roll press cycle closed-circuit system of application specific fine powder separation equipment |
| WO2019030226A1 (en) * | 2017-08-08 | 2019-02-14 | Thyssenkrupp Industrial Solutions Ag | Method and plant for producing cement |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101678625B1 (en) | 2008-07-02 | 2016-11-23 | 뷔흘러 에이지 | Apparatus and method for producing flour and/or semolina |
| CN105344446A (en) * | 2015-11-25 | 2016-02-24 | 天津水泥工业设计研究院有限公司 | Roller press pregrinding system adopting light grinding medium |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2616359A1 (en) * | 1987-06-10 | 1988-12-16 | Kloeckner Humboldt Deutz Ag | METHOD AND INSTALLATION FOR COMPRESSION CONTINUOUS GRINDING OF BREAKING MATERIALS |
| DE3744163A1 (en) * | 1987-12-24 | 1989-07-06 | Kloeckner Humboldt Deutz Ag | Method and plant for processing ore, coal or other minerals |
| DE3915432A1 (en) * | 1989-05-11 | 1990-11-15 | Kloeckner Humboldt Deutz Ag | Standard cement mfr. - using high pressure roller press, sieve and gypsum dehydration heat supply |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3920005A1 (en) * | 1989-06-20 | 1991-01-03 | Kloeckner Humboldt Deutz Ag | PLANT FOR CRUSHING OR GRINDING SPROEDEM GOODS AND METHOD FOR OPERATING SUCH A PLANT |
-
1993
- 1993-10-13 DE DE4334904A patent/DE4334904A1/en not_active Withdrawn
-
1994
- 1994-09-21 DE DE59408467T patent/DE59408467D1/en not_active Expired - Fee Related
- 1994-09-21 EP EP94114845A patent/EP0648539B1/en not_active Expired - Lifetime
- 1994-09-21 DK DK94114845T patent/DK0648539T3/en active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2616359A1 (en) * | 1987-06-10 | 1988-12-16 | Kloeckner Humboldt Deutz Ag | METHOD AND INSTALLATION FOR COMPRESSION CONTINUOUS GRINDING OF BREAKING MATERIALS |
| DE3744163A1 (en) * | 1987-12-24 | 1989-07-06 | Kloeckner Humboldt Deutz Ag | Method and plant for processing ore, coal or other minerals |
| DE3915432A1 (en) * | 1989-05-11 | 1990-11-15 | Kloeckner Humboldt Deutz Ag | Standard cement mfr. - using high pressure roller press, sieve and gypsum dehydration heat supply |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2015078787A1 (en) * | 2013-11-26 | 2015-06-04 | Khd Humboldt Wedag Gmbh | Method for producing cement |
| CN106622600A (en) * | 2017-01-20 | 2017-05-10 | 长沙万荣粉体设备科技有限公司 | Powder grinding device |
| WO2019030226A1 (en) * | 2017-08-08 | 2019-02-14 | Thyssenkrupp Industrial Solutions Ag | Method and plant for producing cement |
| CN111032592A (en) * | 2017-08-08 | 2020-04-17 | 蒂森克虏伯工业解决方案股份公司 | Method and apparatus for producing cement |
| CN108097364A (en) * | 2018-01-31 | 2018-06-01 | 徐州至信建材机械有限公司 | A kind of novel concrete industrial roll press cycle closed-circuit system of application specific fine powder separation equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0648539A3 (en) | 1995-10-11 |
| EP0648539B1 (en) | 1999-07-07 |
| DK0648539T3 (en) | 2000-01-17 |
| DE59408467D1 (en) | 1999-08-12 |
| DE4334904A1 (en) | 1995-04-20 |
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