EP0308350A2 - Mineral fine-pulverising method, and pulveriser for carrying out this method - Google Patents

Mineral fine-pulverising method, and pulveriser for carrying out this method Download PDF

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Publication number
EP0308350A2
EP0308350A2 EP88402353A EP88402353A EP0308350A2 EP 0308350 A2 EP0308350 A2 EP 0308350A2 EP 88402353 A EP88402353 A EP 88402353A EP 88402353 A EP88402353 A EP 88402353A EP 0308350 A2 EP0308350 A2 EP 0308350A2
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EP
European Patent Office
Prior art keywords
cylinders
axes
roller
ground
grinding
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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.)
Granted
Application number
EP88402353A
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German (de)
French (fr)
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EP0308350A3 (en
EP0308350B1 (en
Inventor
René Durinck
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.)
Fives Cail Babcock SA
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F C B
Fives Cail Babcock SA
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Publication of EP0308350A2 publication Critical patent/EP0308350A2/en
Publication of EP0308350A3 publication Critical patent/EP0308350A3/en
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Publication of EP0308350B1 publication Critical patent/EP0308350B1/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
    • B02C4/02—Crushing or disintegrating by roller mills with two or more rollers

Definitions

  • the subject of the present invention is a process for fine grinding of minerals consisting in subjecting a layer of the product to be ground to a compression between two cylinders with parallel axes, rotating in opposite directions and being elastically pushed towards one another.
  • said to be forced feed said to be forced feed, the spacing of the cylinders is adjusted to a low value and the mill is fed with a flow rate equal to several times the theoretical flow rate corresponding to this spacing.
  • the material thus forced between the cylinders causes their displacement at the cost of an overload of the pressure of the springs the greater the greater the flow of material.
  • the present invention provides another solution to this. problem. It consists in keeping the ground material under pressure in the space delimited by the cylinders immediately below the fictitious plane containing the axes of the cylinders.
  • One way of creating this pressure consists in closing said space downwards by a dam so as to leave only a passage of reduced section for the output of the crushed products.
  • This barrier could, for example, consist of a roller with a diameter smaller than that of the cylinders, arranged parallel to the latter below the plane of the axes of the cylinders, this roller being elastically pushed towards one of the cylinders while remaining practically in contact with the other cylinder and forming with the first a narrow slot for the outlet of the ground products; this roller may be free to rotate or driven at an adequate speed.
  • This crusher consists essentially of two identical cylinders 10 and 12, with horizontal and parallel axes, elastically pushed towards one another by springs or by means of a hydro-pneumatic system.
  • the two cylinders are rotated at the same speed and in opposite directions.
  • Under the cylinders is disposed a roller 14 of smaller diameter which is mounted so that it can be close and distant from the cylinder 12 while remaining at a substantially constant and low distance from the cylinder 10.
  • the two bearings 18 of the roller 14 can, for example, be guided in two slides or supported by two arms which can pivot about a parallel axis to the axes of the cylinders, so that, in all working conditions, the roller can assume a position of equilibrium relative to the cylinder 12 by being pushed towards the latter by springs 20 so as to exert the desired pressure on the layer of material between the roller and said cylinder.
  • the roller 14 can be rotated so that its tangential speed is approximately equal to that of the cylinders, or different or left free to rotate.
  • the surface of the roller may be smooth or have circumferential, longitudinal, chevron-shaped ribs or grooves, etc.
  • the roller 14 could be replaced by a suitably profiled bar. Means may be provided for adjusting the relative position of the roller and of the cylinder 10 to compensate for their wear, maintaining a suitable clearance between them.
  • the bearings of the cylinder 10 are fixed and the bearings of the other cylinder 12 are mounted on slides or pivoting arms to allow this cylinder to approach and move away from the first.
  • the movable bearings are held in abutment by the elastic thrust means so as to maintain a minimum spacing between the two cylinders.
  • the material to be ground is loading above the cylinders in a feed chute 16, and the feed rate is significantly greater than the rate corresponding to the minimum spacing, so that the cylinders are maintained at a greater spacing by the layer of material that forms between them.
  • grinding is carried out not only by crushing, under the action of the pressure exerted by the cylinders, but also by attrition between particles, so that a high proportion of fine particles is formed.
  • the grinding zone is extended below this plane by the space 22 delimited by the two cylinders and the roller 14 and where the material continues to be subjected to pressures in several directions, which combats the formation of platelets or agglomerates.
  • the force with which the roller 14 is pushed towards the cylinder 12 is chosen according to the nature of the material to be ground and the maximum pressure exerted by the cylinders so that the ground product contains practically no agglomerates.
  • the material leaving the mill can be further ground in a grinding machine with grinding wheels, balls, etc. It may be subject to classification to separate fine particles, having the particle size of the finished product, larger particles which are either recycled in the grinder with the raw product, or subjected to additional grinding in a finishing apparatus.

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  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)

Abstract

The subject of the invention is a method for the fine pulverising of minerals, consisting in subjecting a layer of the material to be pulverised to a compression between two rolls (10, 12) with parallel axes, rotating in opposite directions and pushed elastically towards each other, and a pulveriser for carrying out this method. In order to prevent the formation of agglomerates, the pulverised material is kept under pressure in the space (22) defined by the rolls (10, 12) immediately below the imaginary plane (X-X) containing the axes of the rolls by closing the said space by a member (14) forming a barrier. <IMAGE>

Description

La présente invention a pour objet un procédé de broyage fin de minéraux consistant à soumettre une couche du produit à broyer à une compression entre deux cylindres à axes parallèles, tournant en sens inverses et poussés élasti­quement l'un vers l'autre. Dans ce mode de fonctionnement du broyeur à cylindres, dit à alimentation forcée, on règle l'écartement des cylindres à une valeur faible et on alimente le broyeur avec un débit égal à plusieurs fois le débit théorique correspondant à cet écartement. La matière ainsi forcée entre les cylindres provoque leur déplacement au prix d'une surcharge de la pression des ressorts d'autant plus grande que le débit de matière est plus important. Il y a alors compactage et autobroyage au sein de la couche de matière et production d'un grand pourcentage de particules nettement plus fines que celles qui seraient obtenues par un broyage grain par grain avec le même écartement des cylindres.The subject of the present invention is a process for fine grinding of minerals consisting in subjecting a layer of the product to be ground to a compression between two cylinders with parallel axes, rotating in opposite directions and being elastically pushed towards one another. In this operating mode of the roll mill, said to be forced feed, the spacing of the cylinders is adjusted to a low value and the mill is fed with a flow rate equal to several times the theoretical flow rate corresponding to this spacing. The material thus forced between the cylinders causes their displacement at the cost of an overload of the pressure of the springs the greater the greater the flow of material. There is then compaction and self-grinding within the layer of material and production of a large percentage of particles much finer than those which would be obtained by grinding grain by grain with the same spacing of the cylinders.

Les pressions élevées auxquelles est soumise la matière entre les cylindres risquent de provoquer la formation d'agglo­mérats et, pour éviter ce phénomène, on a proposé de mélanger aux matières à broyer des produits anti-agglomérants ou de donner aux cylindres des vitesses périphériques différentes. Ces solutions sont onéreuses, la première parce qu'elle con­duit à une consommation relativement importante de produits coûteux, la seconde parce qu'elle entraîne une usure rapide des cylindres.The high pressures to which the material between the cylinders is subjected risks causing the formation of agglomerates and, to avoid this phenomenon, it has been proposed to mix anti-caking agents with the materials to be ground or to give the cylinders different peripheral speeds. These solutions are expensive, the first because it leads to a relatively large consumption of expensive products, the second because it causes rapid wear of the cylinders.

La présente invention apporte une autre solution à ce problème. Elle consiste à maintenir la matière broyée sous pression dans l'espace délimité par les cylindres immédiate­ment au-dessous du plan fictif contenant les axes des cylin­dres. Un moyen de créer cette pression consiste à fermer ledit espace vers le bas par un barrage de façon à ne laisser subsister qu'un passage de section réduite pour la sortie des produits broyés. Ce barrage pourra, par exemple, être consti­tué par un rouleau de diamètre inférieur à celui des cylin­dres, disposé parallèlement à ceux-ci au-dessous du plan des axes des cylindres, ce rouleau étant poussé élastiquement vers l'un des cylindres en restant pratiquement au contact de l'autre cylindre et en formant avec le premier une fente étroite pour la sortie des produits broyés ; ce rouleau pourra être libre en rotation ou entraîné à une vitesse adéquate.The present invention provides another solution to this. problem. It consists in keeping the ground material under pressure in the space delimited by the cylinders immediately below the fictitious plane containing the axes of the cylinders. One way of creating this pressure consists in closing said space downwards by a dam so as to leave only a passage of reduced section for the output of the crushed products. This barrier could, for example, consist of a roller with a diameter smaller than that of the cylinders, arranged parallel to the latter below the plane of the axes of the cylinders, this roller being elastically pushed towards one of the cylinders while remaining practically in contact with the other cylinder and forming with the first a narrow slot for the outlet of the ground products; this roller may be free to rotate or driven at an adequate speed.

La description qui suit se réfère au dessin l'accompagnant qui montre, à titre d'exemple non limitatif, un mode de réalisation de l'invention et dont l'unique figure est une représentation schématique, en coupe, d'un broyeur à cylindres conçu pour la mise en oeuvre de l'invention.The description which follows refers to the accompanying drawing which shows, by way of nonlimiting example, an embodiment of the invention and the only figure of which is a diagrammatic representation, in section, of a roller mill designed for the implementation of the invention.

Ce broyeur est constitué essentiellement par deux cylindres identiques 10 et 12, à axes horizontaux et parallèles, poussés élastiquement l'un vers l'autre par des ressorts ou au moyen d'un système hydro-pneumatique. Les deux cylindres sont entrainés en rotation à la même vitesse et en sens inverses. Sous les cylindres est disposé un rouleau 14 de plus petit diamètre qui est monté de façon à pouvoir être rapproché et éloigné du cylindre 12 tout en restant à une distance sensiblement constante et faible du cylindre 10. Les deux paliers 18 du rouleau 14 peuvent, par exemple, être guidés dans deux glissières ou supportés par deux bras pouvant pivoter autour d'un axe parallèle aux axes des cylindres, de manière à ce que, dans toutes les conditions de travail, le rouleau puisse prendre une position d'équilibre par rapport au cylindre 12 en étant poussé vers celui-ci par des ressorts 20 de façon à exercer la pression voulue sur la couche de matière entre le rouleau et ledit cylindre. Le rouleau 14 peut être entrainé en rotation de telle sorte que sa vitesse tangetielle soit approximativement égale à celle des cylindres, ou différente ou laissé libre en rotation. La surface du rouleau peut être lisse ou comporter des nervures ou des rainures circonférentielles, longitudinales, en forme de chevrons, etc. Le rouleau 14 pourrait être remplacé par une barre convenablement profilée. Des moyens pourront être prévus pour régler la position relative du rouleau et du cylindre 10 pour compenser leur usure maintenir entre eux un jeu convenable.This crusher consists essentially of two identical cylinders 10 and 12, with horizontal and parallel axes, elastically pushed towards one another by springs or by means of a hydro-pneumatic system. The two cylinders are rotated at the same speed and in opposite directions. Under the cylinders is disposed a roller 14 of smaller diameter which is mounted so that it can be close and distant from the cylinder 12 while remaining at a substantially constant and low distance from the cylinder 10. The two bearings 18 of the roller 14 can, for example, be guided in two slides or supported by two arms which can pivot about a parallel axis to the axes of the cylinders, so that, in all working conditions, the roller can assume a position of equilibrium relative to the cylinder 12 by being pushed towards the latter by springs 20 so as to exert the desired pressure on the layer of material between the roller and said cylinder. The roller 14 can be rotated so that its tangential speed is approximately equal to that of the cylinders, or different or left free to rotate. The surface of the roller may be smooth or have circumferential, longitudinal, chevron-shaped ribs or grooves, etc. The roller 14 could be replaced by a suitably profiled bar. Means may be provided for adjusting the relative position of the roller and of the cylinder 10 to compensate for their wear, maintaining a suitable clearance between them.

Généralement, les paliers du cylindre 10 sont fixes et les paliers de l'autre cylindre 12 sont montés sur des glissières ou des bras pivotants pour permettre à ce cylindre de se rapprocher et s'écarter du premier. Au repos les paliers mobiles sont maintenus en butée par les moyens de poussée élastique de façon à maintenir un écartement minimal entre les deux cylindres. En marche, la matière à broyer est mise en charge au-dessus des cylindres dans une goulotte d'alimentation 16, et le débit d'alimentation est nettement supérieur au débit correspondant à l'écartement minimal, de sorte que les cylindres sont maintenus à un écartement supé­rieur par la couche de matière qui se forme entre eux. Au sein de cette couche, le broyage est réalisé non seulement par écrasement, sous l'action de la pression exercée par les cylindres, mais aussi par attrition entre particules, de sorte qu'il se forme une forte proportion de fines particules.Generally, the bearings of the cylinder 10 are fixed and the bearings of the other cylinder 12 are mounted on slides or pivoting arms to allow this cylinder to approach and move away from the first. At rest the movable bearings are held in abutment by the elastic thrust means so as to maintain a minimum spacing between the two cylinders. When in motion, the material to be ground is loading above the cylinders in a feed chute 16, and the feed rate is significantly greater than the rate corresponding to the minimum spacing, so that the cylinders are maintained at a greater spacing by the layer of material that forms between them. Within this layer, grinding is carried out not only by crushing, under the action of the pressure exerted by the cylinders, but also by attrition between particles, so that a high proportion of fine particles is formed.

Contrairement à ce qui se passe dans les broyeurs à cylindres classiques où les produits broyés sortent librement de la zone de broyage, c'est-à-dire de l'espace compris entre les cylindres et limité vers le bas par le plan fictif X - X contenant les axes des cylindres, dans le broyeur objet de l'invention la zone de broyage se prolonge au-dessous de ce plan par l'espace 22 délimité par les deux cylindres et le rouleau 14 et où la matière continue de subir des pressions dans plusieurs directions, ce qui combat la formation de plaquettes ou d'agglomérats. La force avec laquelle le rouleau 14 est poussé vers le cylindre 12 est choisie en fonction de la nature de la matière à broyer et de la pres­sion maximale exercée par les cylindres de telle sorte que le produit broyé ne contienne pratiquement pas d'agglomérats.Contrary to what happens in conventional roller mills where the crushed products leave freely from the crushing zone, that is to say from the space between the cylinders and limited downwards by the imaginary plane X - X containing the axes of the cylinders, in the grinder object of the invention the grinding zone is extended below this plane by the space 22 delimited by the two cylinders and the roller 14 and where the material continues to be subjected to pressures in several directions, which combats the formation of platelets or agglomerates. The force with which the roller 14 is pushed towards the cylinder 12 is chosen according to the nature of the material to be ground and the maximum pressure exerted by the cylinders so that the ground product contains practically no agglomerates.

La matière sortant du broyeur peut subir un broyage complémentaire dans un appareil finisseur à meules, à boulets etc. Elle peut être soumise à une classification pour séparer les particules fines, ayant la granulométrie du produit fini, des particules plus grosses qui sont, soit recyclées dans le broyeur avec le produit brut, soit soumises à un broyage complémentaire dans un appareil finisseur.The material leaving the mill can be further ground in a grinding machine with grinding wheels, balls, etc. It may be subject to classification to separate fine particles, having the particle size of the finished product, larger particles which are either recycled in the grinder with the raw product, or subjected to additional grinding in a finishing apparatus.

Claims (4)

1. Procédé de broyage fin de minéraux consistant à soumettre une couche de la matière à broyer à une compression entre deux cylindres à axes parallèles, tournant en sens inverses et poussés élastiquement l'un vers l'autre, caractérisé en ce qu'on assure une alimentation forcée des cylindres et on maintient la matière broyée sous pression dans l'espace délimité par les cylindres (10, 12) immédiatement au-dessous du plan fictif (X - X) contenant les axes des cylindres.1. A method of fine grinding of minerals consisting in subjecting a layer of the material to be ground to compression between two cylinders with parallel axes, rotating in opposite directions and elastically pushed towards each other, characterized in that it ensures forced feeding of the cylinders and the crushed material is kept under pressure in the space delimited by the cylinders (10, 12) immediately below the imaginary plane (X - X) containing the axes of the cylinders. 2. Procédé de broyage selon la revendication 1, caractérisé en ce qu'on crée ladite pression en fermant ledit espace vers le bas de façon à ne laisser subsister qu'un passage de section réduite pour la sortie des produits broyés.2. Grinding method according to claim 1, characterized in that the said pressure is created by closing the said space downwards so as to leave only a passage of reduced section for the output of the ground products. 3. Procédé de broyage selon la revendication 2, caractérisé en ce qu'une fraction des produits broyés est recyclée entre les cylindres (10, 12).3. Grinding process according to claim 2, characterized in that a fraction of the ground products is recycled between the cylinders (10, 12). 4. Broyeur pour la mise en oeuvre du procédé selon la revendication 1, 2 ou 3, comportant deux cylindres (10, 12) à axes horizontaux et parallèles, tournant en sens inverses et poussés élastiquement l'un vers l'autre, caractérisé en ce qu'il comporte en outre un rouleau (14) dont le diamètre est inférieur à celui des cylindres et qui est placé sous les cylindres, parallèlement à ceux-ci, et poussé élastiquement vers l'un des cylindres en restant pratiquement au contact de l'autre cylindre.4. Crusher for implementing the method according to claim 1, 2 or 3, comprising two cylinders (10, 12) with horizontal and parallel axes, rotating in opposite directions and elastically pushed towards each other, characterized in which it further comprises a roller (14) whose diameter is smaller than that of the cylinders and which is placed under the cylinders, parallel to them, and pushed elastically towards one of the cylinders, remaining practically in contact with the other cylinder.
EP19880402353 1987-09-17 1988-09-16 Mineral fine-pulverising method, and pulveriser for carrying out this method Expired - Lifetime EP0308350B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8712875 1987-09-17
FR8712875A FR2620635B1 (en) 1987-09-17 1987-09-17 PROCESS OF FINE GRINDING OF MINERALS AND CRUSHER FOR THE IMPLEMENTATION OF THIS PROCESS

Publications (3)

Publication Number Publication Date
EP0308350A2 true EP0308350A2 (en) 1989-03-22
EP0308350A3 EP0308350A3 (en) 1990-02-07
EP0308350B1 EP0308350B1 (en) 1995-08-09

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EP19880402353 Expired - Lifetime EP0308350B1 (en) 1987-09-17 1988-09-16 Mineral fine-pulverising method, and pulveriser for carrying out this method

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EP (1) EP0308350B1 (en)
ES (1) ES2076162T3 (en)
FR (1) FR2620635B1 (en)
GR (1) GR3017286T3 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2648366A2 (en) * 1987-09-17 1990-12-21 Fives Cail Babcock Method for fine grinding of minerals and mill (grinder) for implementing this method
EP0404656A1 (en) * 1989-06-20 1990-12-27 F C B Mineral fine-pulverising method and pulveriser for carrying out this method
CZ299850B6 (en) * 2000-01-28 2008-12-10 F. L. Smidth & Co. A/S Apparatus for grinding particulate material
CN106076490A (en) * 2016-06-25 2016-11-09 五洲丰农业科技有限公司 Composite fertilizer material three axle fine crusher
CN106179578A (en) * 2015-05-05 2016-12-07 威而德(日照)园林机械有限公司 leaf shattering machine
CN112495488A (en) * 2020-12-15 2021-03-16 南京楠凡钰商贸有限公司 Preparation method of moisturizing skin care product

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1396711A (en) * 1921-08-15 1921-11-08 Johnston George Apparatus for pulverizing ore and the like
GB688165A (en) * 1949-12-30 1953-02-25 Miag Vertriebs Gmbh Improvements in or relating to comminuting devices in roller mills
DE1757093A1 (en) * 1968-03-29 1971-03-18 Alpine Ag Roller mill for fine grinding
FR2114071A5 (en) * 1970-11-13 1972-06-30 Constantin E Sa
DE3323517A1 (en) * 1983-06-30 1985-01-10 Klöckner-Humboldt-Deutz AG, 5000 Köln Plant for the comminution of brittle grinding material such as e.g. cement clinker, ore, coal or the like
DE3525936A1 (en) * 1985-07-19 1987-01-29 Krupp Polysius Ag Method and system for dehydrating and comminuting material for milling with a high moisture content

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1396711A (en) * 1921-08-15 1921-11-08 Johnston George Apparatus for pulverizing ore and the like
GB688165A (en) * 1949-12-30 1953-02-25 Miag Vertriebs Gmbh Improvements in or relating to comminuting devices in roller mills
DE1757093A1 (en) * 1968-03-29 1971-03-18 Alpine Ag Roller mill for fine grinding
FR2114071A5 (en) * 1970-11-13 1972-06-30 Constantin E Sa
DE3323517A1 (en) * 1983-06-30 1985-01-10 Klöckner-Humboldt-Deutz AG, 5000 Köln Plant for the comminution of brittle grinding material such as e.g. cement clinker, ore, coal or the like
DE3525936A1 (en) * 1985-07-19 1987-01-29 Krupp Polysius Ag Method and system for dehydrating and comminuting material for milling with a high moisture content

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2648366A2 (en) * 1987-09-17 1990-12-21 Fives Cail Babcock Method for fine grinding of minerals and mill (grinder) for implementing this method
EP0404656A1 (en) * 1989-06-20 1990-12-27 F C B Mineral fine-pulverising method and pulveriser for carrying out this method
CZ299850B6 (en) * 2000-01-28 2008-12-10 F. L. Smidth & Co. A/S Apparatus for grinding particulate material
CN106179578A (en) * 2015-05-05 2016-12-07 威而德(日照)园林机械有限公司 leaf shattering machine
CN106076490A (en) * 2016-06-25 2016-11-09 五洲丰农业科技有限公司 Composite fertilizer material three axle fine crusher
CN112495488A (en) * 2020-12-15 2021-03-16 南京楠凡钰商贸有限公司 Preparation method of moisturizing skin care product

Also Published As

Publication number Publication date
FR2620635B1 (en) 1992-09-11
GR3017286T3 (en) 1995-11-30
EP0308350A3 (en) 1990-02-07
ES2076162T3 (en) 1995-11-01
EP0308350B1 (en) 1995-08-09
FR2620635A1 (en) 1989-03-24

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