EP0348262B1 - Process for comminuting minerals and roller mill for applying this process - Google Patents

Process for comminuting minerals and roller mill for applying this process Download PDF

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Publication number
EP0348262B1
EP0348262B1 EP19890401594 EP89401594A EP0348262B1 EP 0348262 B1 EP0348262 B1 EP 0348262B1 EP 19890401594 EP19890401594 EP 19890401594 EP 89401594 A EP89401594 A EP 89401594A EP 0348262 B1 EP0348262 B1 EP 0348262B1
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EP
European Patent Office
Prior art keywords
rolls
transducer
ground
cylinders
grinding mill
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EP19890401594
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German (de)
French (fr)
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EP0348262A1 (en
Inventor
Alain Chielens
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C4/00—Crushing or disintegrating by roller mills
    • B02C4/02—Crushing or disintegrating by roller mills with two or more rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C19/00—Other disintegrating devices or methods
    • B02C19/16—Mills provided with vibrators
    • 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
    • B02C4/10—Crushing or disintegrating by roller mills with a roller co-operating with a stationary member
    • B02C4/18—Crushing or disintegrating by roller mills with a roller co-operating with a stationary member in the form of a bar

Definitions

  • the present invention relates to a process of 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 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 subjecting the ground material to vibrations at low or medium frequency at its exit from the cylinders, in an area located as close as possible to the imaginary plane containing the axes of the cylinders.
  • the vibration frequency will be between 1 Hz and 1000 Hz.
  • These vibrations can be applied to the ground material by means of a transducer constituted, for example, by a bar with a triangular section, solid or hollowed out and in the latter case with contours. closed or not, placed between the cylinders with one of its edges situated as close as possible to the imaginary plane containing the axes of the cylinders and subjected to longitudinal and / or transverse vibrations by known means.
  • the vibrations could be applied by means of a roller of small diameter, with an axis parallel to the axes of the cylinders, and placed between the cylinders below the plane of the axes of the cylinders. Sufficient space will be provided between the transducer and at least one of the cylinders to allow the evacuation of the ground products.
  • 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. Both cylinders are rotated at the same speed and in opposite directions, as indicated by the arrows.
  • a bar 14 of triangular section arranged with one of its edges upward and symmetrically with respect to the plane of symmetry of the cylinders.
  • This bar is supported at its ends by elastic means or slides and is connected to a vibration generator 16, electromagnetic, unbalanced or of any other type, which makes it vibrate longitudinally and / or transversely.
  • Adjustment means are provided to adjust the position of the bar relative to the cylinders, in particular to compensate for wear, and maintain a predetermined clearance between the bar and the cylinders.
  • an instantaneous erasure device for the bar which can be a known device with springs, counterweight, hydraulic or other means, is provided to allow the passage of overwhelming elements.
  • the bearings of one of the cylinders are fixed and the bearings of the other cylinder are mounted on slides or pivoting arms to allow it to approach and move away from the first cylinder.
  • the mobile bearings are held in abutment by the elastic thrust means so as to maintain a minimum spacing between the cylinders.
  • the material to be ground is loaded above the cylinders in a chute supply 18, and the feed rate is significantly greater than the rate corresponding to the minimum spacing, fixed by the stops, so that the cylinders are maintained at a greater spacing by the layer of material which forms between them.
  • the grinding is carried out not only by crushing, under the action of the pressure exerted by the cylinders, but also by attrition between the particles, so that a high proportion of fine particles is formed.
  • the vibrations applied by the bar 14 to the layer of ground material causes the destruction of possible agglomerates in the ground product.
  • the frequency of the vibrations is chosen according to the nature of the materials to be ground and will be between 1 and 1000 Hertz.
  • the ground material is discharged through the slots provided between the cylinders and the bar, on either side of the latter.
  • the bar could be arranged asymmetrically very close to one of the cylinders, the crushed materials then being discharged through the slot made between the bar and the other cylinder.
  • the bar could possibly be replaced by a small diameter roller placed asymmetrically near one of the cylinders with its axis parallel to those of the cylinders.
  • the device for vibrating the bar may be provided with adjustment means making it possible to maintain the amplitude of the vibrations at a value sufficient to create the energy necessary to obtain the desired result: absence of agglomerates in the product leaving the mill.
  • this device is constituted by an electromagnetic vibrator, the frequency can be controlled by the amplitude so as to maintain the level of amplitude whatever the added mass of ground particles supported instantaneously by the bar.

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

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 present invention relates to a process of 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 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 clearly 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 entraine 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 soumettre la matière broyée à des vibrations à basse ou moyenne fréquence à sa sortie des cylindres, dans une zone située aussi près que possible du plan fictif contenant les axes des cylindres. La fréquence de vibration sera comprise entre 1 Hz et 1000 Hz. Ces vibrations pourront être appliquées à la matière broyée au moyen d'un transducteur constitué, par exemple, par une barre à section triangulaire, pleine ou évidée et dans ce dernier cas à contours fermés ou non, placée entre les cylindres avec une de ses arêtes située le plus près possible du plan fictif contenant les axes des cylindres et soumise à des vibrations longitudinales et/ou transversales par des moyens connus. En variante, les vibrations pourront être appliquées au moyen d'un rouleau de petit diamètre, à axe parallèle aux axes des cylindres, et placé entre les cylindres au-dessous du plan des axes des cylindres. Un espace suffisant sera ménagé entre le transducteur et au moins un des cylindres pour permettre l'évacuation des produits broyés.The present invention provides another solution to this problem. It consists in subjecting the ground material to vibrations at low or medium frequency at its exit from the cylinders, in an area located as close as possible to the imaginary plane containing the axes of the cylinders. The vibration frequency will be between 1 Hz and 1000 Hz. These vibrations can be applied to the ground material by means of a transducer constituted, for example, by a bar with a triangular section, solid or hollowed out and in the latter case with contours. closed or not, placed between the cylinders with one of its edges situated as close as possible to the imaginary plane containing the axes of the cylinders and subjected to longitudinal and / or transverse vibrations by known means. As a variant, the vibrations could be applied by means of a roller of small diameter, with an axis parallel to the axes of the cylinders, and placed between the cylinders below the plane of the axes of the cylinders. Sufficient space will be provided between the transducer and at least one of the cylinders to allow the evacuation of the ground products.

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 following description refers to the accompanying drawing which shows, by way of non-limiting example, an embodiment of the invention and the only figure of which is a schematic representation, in section, of a mill cylinders 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, comme indiqué par les flèches.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. Both cylinders are rotated at the same speed and in opposite directions, as indicated by the arrows.

Entre les cylindres et au-dessous du plan X-X contenant les axes des cylindres est placée une barre 14 à section triangulaire disposée avec l'une de ses arêtes vers le haut et symétriquement par rapport au plan de symétrie des cylindres. Cette barre est supportée à ses extrémités par des moyens élastiques ou des glissières et est reliée à un générateur de vibrations 16, électromagnétique , à balourd ou de tout autre type, qui permet de la faire vibrer longitudinalement et/ou transversalement. Des moyens de réglage, non représentés, sont prévus pour ajuster la position de la barre par rapport aux cylindres, notamment pour compenser l'usure, et maintenir un jeu prédéterminé entre la barre et les cylindres. Par ailleurs, un dispositif d'effacement instantané de la barre, qui peut être un dispositif connu à ressorts, à contrepoids, hydraulique ou autre, est prévu pour permettre le passage d'élements imbroyables.Between the cylinders and below the plane X-X containing the axes of the cylinders is placed a bar 14 of triangular section arranged with one of its edges upward and symmetrically with respect to the plane of symmetry of the cylinders. This bar is supported at its ends by elastic means or slides and is connected to a vibration generator 16, electromagnetic, unbalanced or of any other type, which makes it vibrate longitudinally and / or transversely. Adjustment means, not shown, are provided to adjust the position of the bar relative to the cylinders, in particular to compensate for wear, and maintain a predetermined clearance between the bar and the cylinders. Furthermore, an instantaneous erasure device for the bar, which can be a known device with springs, counterweight, hydraulic or other means, is provided to allow the passage of unbelievable elements.

Les paliers de l'un des cylindres sont fixes et les paliers de l'autre cylindre sont montés sur des glissières ou des bras pivotants pour lui permettre de se rapprocher et s'écarter du premier cylindre. Au repos, les paliers mobiles sont maintenus en butée par les moyens de poussée élastique de façon à maintenir un écartement minimal entre les cylindres. En marche, les matières à broyer sont mises en charge au-dessus des cylindres dans une goulotte d'alimentation 18, et le débit d'alimentation est nettement supérieur au débit correspondant à l'écartement minimal, fixé par les butées, de sorte que les cylindres sont maintenus à un écartement supérieur par la couche de matières 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 les particules, de sorte qu'il se forme une forte proportion de fines particules.The bearings of one of the cylinders are fixed and the bearings of the other cylinder are mounted on slides or pivoting arms to allow it to approach and move away from the first cylinder. At rest, the mobile bearings are held in abutment by the elastic thrust means so as to maintain a minimum spacing between the cylinders. In operation, the material to be ground is loaded above the cylinders in a chute supply 18, and the feed rate is significantly greater than the rate corresponding to the minimum spacing, fixed by the stops, so that the cylinders are maintained at a greater spacing by the layer of material which forms between them. Within this layer, the grinding is carried out not only by crushing, under the action of the pressure exerted by the cylinders, but also by attrition between the particles, so that a high proportion of fine particles is formed.

Les vibrations appliquées par la barre 14 à la couche des matières broyées provoquent la destruction d'éventuels agglomérats dans le produit broyé. La fréquence des vibrations est choisie en fonction de la nature des matières à broyer et sera comprise entre 1 et 1000 Hertz. Les matières broyées sont évacuées à travers les fentes ménagées entre les cylindres et la barre, de part et d'autre de celle-ci.The vibrations applied by the bar 14 to the layer of ground material causes the destruction of possible agglomerates in the ground product. The frequency of the vibrations is chosen according to the nature of the materials to be ground and will be between 1 and 1000 Hertz. The ground material is discharged through the slots provided between the cylinders and the bar, on either side of the latter.

En variante, la barre pourrait être disposée asymétriquement très près de l'un des cylindres, les matières broyées étant alors évacuées à travers la fente ménagée entre la barre et l'autre cylindre. La barre pourrait éventuellement être remplacée par un rouleau de petit diamètre placé asymétriquement près de l'un des cylindres avec son axe parallèle à ceux des cylindres.As a variant, the bar could be arranged asymmetrically very close to one of the cylinders, the crushed materials then being discharged through the slot made between the bar and the other cylinder. The bar could possibly be replaced by a small diameter roller placed asymmetrically near one of the cylinders with its axis parallel to those of the cylinders.

Le dispositif de mise en vibration de la barre pourra être muni de moyens de réglage permettant de maintenir l'amplitude des vibrations à une valeur suffisante pour créer l'énergie nécessaire à l'obtention du résultat recherché : absence d'agglomérats dans le produit sortant du broyeur. En particulier, si ce dispositif est constitué par un vibreur électromagnétique, la fréquence pourra être asservie à l'amplitude de façon à maintenir le niveau d'amplitude quelle que soit la masse ajoutée de particules broyées supportée instantanément par la barre.The device for vibrating the bar may be provided with adjustment means making it possible to maintain the amplitude of the vibrations at a value sufficient to create the energy necessary to obtain the desired result: absence of agglomerates in the product leaving the mill. In particular, if this device is constituted by an electromagnetic vibrator, the frequency can be controlled by the amplitude so as to maintain the level of amplitude whatever the added mass of ground particles supported instantaneously by the bar.

Claims (5)

1. Process for comminuting minerals consisting in subjecting a layer of the material to be ground to a compressive stress between two parallel-axis rolls (10, 12) rotating in opposite directions and flexibly thrusted against each other, characterized in that the ground material flowing out from between the rolls (10, 12) is subjected to vibrations the frequency of which ranges between 1 and 1 000 Hertz and is such that the ground product contains practically no agglomerates, the said vibrations being applied by means of an elongated transducer (14) arranged lengthwise between the rolls (10, 12) and under the (X - X) plane containing the axes of the said rolls, and in that the said transducer (14) is kept off at least one of the rolls (10, 12) to allow the ground materials to flow out.
2. Grinding mill for implementing the process according to claim 1 characterized in that the said transducer consists of a solid or hollowed triangular cross-section bar (14) arranged between the rolls (10, 14) so as to form a way out for the ground material flow with at least one of the rolls.
3. Grinding mill for implementing the process according to claim 1, characterized in that the said transducer consists of a small-diameter roll arranged parallel to the axes of the said rolls so as to form a way out for the ground material flow with one of the rolls.
4. Grinding mill according to claim 2 or 3, characterized in that the said transducer is provided with an automatic vibration amplitude control device.
5. Grinding mill according to claim 2, 3 or 4, characterized in that the said transducer is supported by an instantaneous drawing back device allowing uncrushable elements to flow out.
EP19890401594 1988-06-24 1989-06-08 Process for comminuting minerals and roller mill for applying this process Expired - Lifetime EP0348262B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8808519A FR2633197B1 (en) 1988-06-24 1988-06-24 PROCESS OF FINE GRINDING OF MINERALS AND IMPROVED CYLINDER GRINDER FOR CARRYING OUT SAID METHOD
FR8808519 1988-06-24

Publications (2)

Publication Number Publication Date
EP0348262A1 EP0348262A1 (en) 1989-12-27
EP0348262B1 true EP0348262B1 (en) 1992-04-29

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ID=9367689

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EP19890401594 Expired - Lifetime EP0348262B1 (en) 1988-06-24 1989-06-08 Process for comminuting minerals and roller mill for applying this process

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EP (1) EP0348262B1 (en)
ES (1) ES2030986T3 (en)
FR (1) FR2633197B1 (en)
GR (1) GR3004777T3 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104056682A (en) * 2014-06-06 2014-09-24 陈晨 Roller-plate ore grinding machine

Family Cites Families (3)

* 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
DE3433577A1 (en) * 1984-09-13 1986-03-13 Hazemag Dr. E. Andreas GmbH & Co, 4400 Münster Roller mill

Also Published As

Publication number Publication date
FR2633197A1 (en) 1989-12-29
ES2030986T3 (en) 1992-11-16
FR2633197B1 (en) 1992-07-24
EP0348262A1 (en) 1989-12-27
GR3004777T3 (en) 1993-04-28

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