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EP0366516A1 - Process for grinding and drying wet minerals, and equipment for carrying out this process - Google Patents

Process for grinding and drying wet minerals, and equipment for carrying out this process Download PDF

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Publication number
EP0366516A1
EP0366516A1 EP89402783A EP89402783A EP0366516A1 EP 0366516 A1 EP0366516 A1 EP 0366516A1 EP 89402783 A EP89402783 A EP 89402783A EP 89402783 A EP89402783 A EP 89402783A EP 0366516 A1 EP0366516 A1 EP 0366516A1
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EP
European Patent Office
Prior art keywords
grinding
mill
fine grinding
grinding chamber
chamber
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP89402783A
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German (de)
French (fr)
Inventor
Francis Dambrine
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.)
F C B
Original Assignee
F C B
Fives Cail Babcock SA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by F C B, Fives Cail Babcock SA filed Critical F C B
Publication of EP0366516A1 publication Critical patent/EP0366516A1/en
Withdrawn legal-status Critical Current

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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
    • B02C21/002—Disintegrating plant with or without drying of the material using a combination of a roller mill and a drum mill
    • B02C21/005—Disintegrating plant with or without drying of the material using a combination of a roller mill and a drum mill the roller mill having cooperating 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
    • B02C23/00—Auxiliary methods or auxiliary devices or accessories specially adapted for crushing or disintegrating not provided for in preceding groups or not specially adapted to apparatus covered by a single preceding group
    • B02C23/18—Adding fluid, other than for crushing or disintegrating by fluid energy
    • B02C23/24—Passing gas through crushing or disintegrating zone
    • B02C23/32—Passing gas through crushing or disintegrating zone with return of oversize material to crushing or disintegrating zone

Definitions

  • the present invention relates to the drying and grinding of wet materials, for example one or more raw materials for the manufacture of a cement clinker, and more particularly the methods and installations using for these operations a rotary tubular mill with divided balls in several chambers and provided with an inlet at each of its ends and peripheral outlet orifices situated between the pre-grinding and fine grinding chambers.
  • the wet product to be ground is introduced at one end of the tubular mill, into a drying chamber.
  • This chamber can be confused with the pre-grinding chamber or separated from it by a partition provided with levers which allow the passage of the product from one chamber to the other while preventing the exit of the grinding bodies contained in the pre-grinding.
  • the pre-grinding and fine grinding chambers are separated from each other by perforated partitions between which the peripheral outlet orifices are located, arranged in one or two circular rows.
  • the product leaving the pre-grinding chamber through said orifices is sent to a classifier where it is divided into two fractions: a fine fraction constituting the finished product and a coarse fraction which is introduced into the fine grinding chamber, through the other end of the crusher.
  • the product leaving the fine grinding chamber through the peripheral orifices is also sent to the classifier which may or may not be the one used in the first step. Gases are admitted at the two ends of the mill, evacuated by the peripheral orifices, which open out into a circular cover surrounding the mill, and sent to a separator and a dust collector; the larger particles separated from the gases are sent to the classifier or directly to the fine grinding chamber and the finer particles are removed with the finished product.
  • the object of the present invention is to reduce the specific consumption and to increase, for a given dimensioning of the tubular mill, the capacity of the installations of the type described above.
  • the drying and grinding process object of the invention, is characterized in that at least a fraction of the dried and partially milled product leaving the pre-grinding chamber is subjected to crushing grinding in a forced-feed roller mill and at least a fraction of the product leaving said cylinder mill is introduced into the fine grinding chamber of the tubular mill, the product leaving this latter chamber being sent to the classifier.
  • a fraction of the product leaving the cylinder mill can be returned to the inlet of said mill.
  • a partial flow of classifier refusals and / or a fraction of the product leaving the fine grinding chamber and / or a portion of the largest particles separated from the gases may be returned to the inlet of the cylinder mill.
  • the installation which is the subject of the invention is characterized in that it comprises, in addition to the conventional multi-chamber tubular crusher, a cylinder crusher designed to operate as a forced feed, the inlet of which is connected to the outlet of the chamber pre-grinding of the tubular crusher and the outlet of which is connected to the inlet of the fine grinding chamber.
  • a distributor may be provided at the outlet of the roller mill to allow recycling of a fraction of the product leaving said mill, one outlet of this dispenser being connected to the inlet of the fine grinding chamber and the other outlet being connected at the entrance of the roller mill.
  • Distributors may also be placed on the outlet of the classifier rejects and on the outlet of the fine grinding chamber to allow a fraction of the products extracted by these outlets to be returned to the inlet of the roller mill.
  • the pre-grinding and fine grinding chambers can be separated by a solid partition, the outlet orifices then being arranged in two circular rows, on either side of this partition.
  • the single figure in this drawing schematically represents an installation for implementing the invention essentially comprising a rotary tubular dryer-mill 10, a cylinder mill 12, a classifier 14 and a separator-dust collector 16.
  • the dryer-mill 10 is supported and rotated by conventional means. It has an inlet at each of its ends and is divided into a drying chamber 18, a pre-grinding chamber 20 and a fine grinding chamber 22.
  • the chambers 18 and 20 are separated by a partition 24 provided with blades and d a central opening making it possible to transfer the products from one chamber to the other while preventing the grinding bodies (balls) contained in the chamber 20 from passing into the chamber 18.
  • the chambers 20 and 22 are separated by a solid partition 26. Holes 28-30 are formed in the shell of the mill, in two circular rows arranged on either side of the partition 26. Grids 32-34 are placed in front these orifices to prevent the passage of the grinding bodies and limit the particle size of the products leaving the chambers 20 and 22.
  • the orifices 28-30 open into covers 36-38 surrounding the grinder.
  • the lower part of each of these hoods is in the form of a hopper and is provided with an evacuation orifice connected, directly or by any means of transport, to the base of an elevator, for example with buckets, 40-42.
  • a distributor 44 placed on the evacuation orifice of the cover 38 makes it possible to direct a part of the products leaving the chamber 22 towards the elevator 40.
  • the upper part of the covers 36-38 is connected to a separation-dedusting unit shown diagrammatically at 16.
  • this unit the gases escaping from the chambers 20 and 22, through the orifices 28-30 are freed from the grains and dust which they carry.
  • the gases captured by the covers 36 and 38 could be treated in two separate units.
  • the roller mill 12 is designed to operate in forced feeding. In this operating mode, the spacing of the cylinders is adjusted to a low value and the mill is supplied with a flow rate equal to several times the theoretical flow rate corresponding to this spacing. The cylinders are then separated from each other against the action of the springs or jacks, which tend to bring them closer, and exert on the layer of compressed material between the cylinders a pressure all the greater as the flow of material is more important. There is then compaction and self-grinding within the layer of material and production of a large number of particles much finer than those which would be obtained by grinding grain by grain.
  • the roller mill 12 is supplied by the elevator 40.
  • the crushed products are collected in a hopper placed under the cylinders and a distributor 46 makes it possible to divide them into two streams, one of which is sent to the fine grinding chamber 22 of the tubular crusher and the other is recycled, for example by means of the elevator 40.
  • the classifier 14 can be an air separator, static or dynamic, or of any other known type. It is supplied by the elevator 42 and has two outputs: an output for fine products (48), and an output for rejects. A distributor 50 placed on this last outlet makes it possible to recycle a fraction of the rejects in the fine grinding chamber 22 and to bring the other fraction to the inlet of the roller mill 12.
  • the separator-dust collector 16 the relatively large particles are separated from the dust which is mixed with the finished product, the first being sent either to the inlet of the roller mill 12 or to the fine grinding chamber 22.
  • the operation of this installation is as follows:
  • the wet product to be ground M is introduced with a hot gas G into the chamber 18 where it is dried; this room can be provided with levers or other organs improving heat exchange.
  • the dried product passes into chamber 20 which contains balls ensuring pre-grinding of the product up to a particle size suitable for the operation of the roller mill 12.
  • the product having the desired particle size passes through the grid 32, falls into the bottom of the cover 36, through the orifices 28, then is taken up by the elevator 40 and discharged into the hopper 13 loaded on the mill 12 .
  • the dried and pre-crushed product undergoes additional grinding before being returned to the chamber 22 of the tubular crusher 10 where it is subjected to a final grinding by the balls contained in this chamber; a fraction of the product leaving the mill 12 can be recycled (link 47).
  • the product having the desired particle size crosses the grid 34 and falls into the bottom of the cover 38, through the orifices 30, and is taken up by the elevator 42 which supplies the classifier 14.
  • the finished product leaves the finished product which is discharged at 48 and, on the other hand, the rejects which are returned to the chamber 22 of the mill 10, either wholly or partially; in the latter case, the other fraction of the refusals is sent to the supply to the roller mill 12 (link 51).
  • a part of the product leaving the chamber 22 can optionally be brought back to the inlet of the mill 12 by the distributor 44 and the link 45.
  • the drying gas having passed through the chambers 18 and 20 and the ventilation air A or the gases necessary for drying the abrasive or rheologically plastic moist products admitted into the chamber 22 are collected in the covers 36 and 38 and freed of the grains and dust. which they transport in the separator-dust collector 16.
  • the fine particles are mixed with the finished products and the larger grains are returned either to the chamber 22 of the mill 10, or to the mill 12.
  • the invention also makes it possible to substantially increase the capacity of an existing installation with a tubular crusher, by adding a cylinder crusher to it.
  • the pre-grinding chamber can be omitted or confused with the drying chamber.
  • the solid partition 26 could be eliminated, the orifices 28 and 30 being combined and the covers 36 and 38 replaced by a single cover; in this case, the products collected at the bottom of the hood will be shared between the cylinder crusher and the classifier.

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

Abstract

The present invention relates to the drying and the grinding of wet materials, for example of one or more raw materials for the manufacture of a cement clinker and, more particularly, the processes and equipment using, for these operations, a rotary tubular ball mill divided into several chambers and equipped with an inlet at each of its ends and peripheral discharge orifices located between the coarse- grinding and fine-grinding chambers. With a view to reducing the specific consumption and to increasing, for a given dimensioning of the tubular mill, the capacity of the equipment of the type described hereinabove, the dried and partially ground product emerging from the coarse-grinding chamber (20) is subjected to grinding by crushing in a forced-feed roll mill (12) and at least a fraction of the product emerging from the said roll mill is introduced into the fine-grinding chamber (22) of the tubular mill (10), the product emerging from this latter chamber being conveyed into a classifier (14). <IMAGE>

Description

La présente invention concerne le séchage et le broyage de matières humides, par exemple d'une ou plusieurs matières premières pour la fabrication d'un clinker de ciment, et plus particulièrement les procédés et installations utilisant pour ces opérations un broyeur tubulaire rotatif à boulets divisé en plusieurs chambres et muni d'une entrée à chacune de ses extrémités et d'orifices de sortie périphériques situés entre les chambres de prébroyage et de broyage fin.The present invention relates to the drying and grinding of wet materials, for example one or more raw materials for the manufacture of a cement clinker, and more particularly the methods and installations using for these operations a rotary tubular mill with divided balls in several chambers and provided with an inlet at each of its ends and peripheral outlet orifices situated between the pre-grinding and fine grinding chambers.

Dans les installations connues du type concerné, le produit humide à broyer est introduit à une extrémité du broyeur tubulaire, dans une chambre de séchage. Cette chambre peut être confondue avec la chambre de prébroyage ou séparée de celle-ci par une cloison munie de releveurs qui permettent le passage du produit d'une chambre dans l'autre tout en interdisant la sortie des corps de broyage contenus dans la chambre de prébroyage. Les chambres de prébroyage et de broyage fin sont séparées l'une de l'autre par des cloisons perforées entre lesquelles se trouvent les orifices de sortie périphériques disposés suivant une ou deux rangées circulaires. Le produit sortant de la chambre de prébroyage par lesdits orifices est envoyé à un classificateur où il est divisé en deux fractions : une fraction fine constituant le produit fini et une fraction grossière qui est introduite dans la chambre de broyage fin, par l'autre extrémité du broyeur. Le produit sortant de la chambre de broyage fin par les orifices périphériques est également envoyé au classificateur qui peut être ou non celui utilisé dans la première étape. Des gaz sont admis aux deux extrémités du broyeur, évacués par les orifices périphériques, qui débouchent dans un capot circulaire entourant le broyeur, et envoyés dans un séparateur et un dépoussiéreur; les particules les plus grosses séparées des gaz sont envoyées dans le classificateur ou directement dans la chambre de broyage fin et les particules plus fines sont évacuées avec le produit fini.In known installations of the type concerned, the wet product to be ground is introduced at one end of the tubular mill, into a drying chamber. This chamber can be confused with the pre-grinding chamber or separated from it by a partition provided with levers which allow the passage of the product from one chamber to the other while preventing the exit of the grinding bodies contained in the pre-grinding. The pre-grinding and fine grinding chambers are separated from each other by perforated partitions between which the peripheral outlet orifices are located, arranged in one or two circular rows. The product leaving the pre-grinding chamber through said orifices is sent to a classifier where it is divided into two fractions: a fine fraction constituting the finished product and a coarse fraction which is introduced into the fine grinding chamber, through the other end of the crusher. The product leaving the fine grinding chamber through the peripheral orifices is also sent to the classifier which may or may not be the one used in the first step. Gases are admitted at the two ends of the mill, evacuated by the peripheral orifices, which open out into a circular cover surrounding the mill, and sent to a separator and a dust collector; the larger particles separated from the gases are sent to the classifier or directly to the fine grinding chamber and the finer particles are removed with the finished product.

Le but de la présente invention est de diminuer la consommation spécifique et d'augmenter, pour un dimensionnement donné du broyeur tubulaire,la capacité des installations du type décrit ci-dessus.The object of the present invention is to reduce the specific consumption and to increase, for a given dimensioning of the tubular mill, the capacity of the installations of the type described above.

Le procédé de séchage et broyage, objet de l'invention, est caractérisé en ce qu'au moins une fraction du produit séché et partiellement broyé sortant de la chambre de prébroyage est soumis à un broyage par écrasement dans un broyeur à cylindres à alimentation forcée et au moins une fraction du produit sortant dudit broyeur à cylindres est introduite dans la chambre de broyage fin du broyeur tubulaire, le produit sortant de cette dernière chambre étant envoyé dans le classificateur.The drying and grinding process, object of the invention, is characterized in that at least a fraction of the dried and partially milled product leaving the pre-grinding chamber is subjected to crushing grinding in a forced-feed roller mill and at least a fraction of the product leaving said cylinder mill is introduced into the fine grinding chamber of the tubular mill, the product leaving this latter chamber being sent to the classifier.

Une fraction de produit sortant du broyeur à cylindres pourra être renvoyée à l'entrée dudit broyeur. De même, un débit partiel des refus du classificateur et/ou une fraction du produit sortant de la chambre de broyage fin et/ou une partie des particules les plus grosses séparées des gaz pourront être renvoyés à l'entrée du broyeur à cylindres.A fraction of the product leaving the cylinder mill can be returned to the inlet of said mill. Likewise, a partial flow of classifier refusals and / or a fraction of the product leaving the fine grinding chamber and / or a portion of the largest particles separated from the gases may be returned to the inlet of the cylinder mill.

Lorsque l'on broye simultanément plusieurs produits pour obtenir un mélange de composition donnée et que l'un des produits est particulièrement abrasif ou à rhéologie plastique, on peut l'introduire directement dans la chambre de broyage fin pour éviter l'usure des cylindres du broyeur à cylindres.When several products are milled simultaneously to obtain a mixture of given composition and one of the products is particularly abrasive or with plastic rheology, it can be introduced directly into the fine grinding chamber to avoid wear of the cylinders of the cylinder crusher.

L'installation objet de l'invention est caractérisée en ce qu'elle comporte, en plus du broyeur tubulaire à plusieurs chambres classique, un broyeur à cylindres conçu pour fonctionner en alimentation forcée, dont l'entrée est reliée à la sortie de la chambre de prébroyage du broyeur tubulaire et dont la sortie est reliée à l'entrée de la chambre de broyage fin. Un distributeur pourra être prévu à la sortie du broyeur à cylindres pour permettre le recyclage d'une fraction du produit sortant dudit broyeur, une sortie de ce distributeur étant reliée à l'entrée de la chambre de broyage fin et l'autre sortie étant reliée à l'entrée du broyeur à cylindres. Des distributeurs pourront également être placés sur la sortie des refus du classificateur et sur la sortie de la chambre de broyage fin pour permettre de renvoyer à l'entrée du broyeur à cylindres une fraction des produits extraits par ces sorties.The installation which is the subject of the invention is characterized in that it comprises, in addition to the conventional multi-chamber tubular crusher, a cylinder crusher designed to operate as a forced feed, the inlet of which is connected to the outlet of the chamber pre-grinding of the tubular crusher and the outlet of which is connected to the inlet of the fine grinding chamber. A distributor may be provided at the outlet of the roller mill to allow recycling of a fraction of the product leaving said mill, one outlet of this dispenser being connected to the inlet of the fine grinding chamber and the other outlet being connected at the entrance of the roller mill. Distributors may also be placed on the outlet of the classifier rejects and on the outlet of the fine grinding chamber to allow a fraction of the products extracted by these outlets to be returned to the inlet of the roller mill.

Les chambres de pré-broyage et de broyage fin pourront être séparées par une cloison pleine, les orifices de sortie étant alors disposés suivant deux rangées circulaires, de part et d'autre de cette cloison.The pre-grinding and fine grinding chambers can be separated by a solid partition, the outlet orifices then being arranged in two circular rows, on either side of this partition.

D'autres caractéristiques de l'invention apparaitront à la lecture de la description qui suit et se réfère au dessin l'accompagnant qui montre, à titre d'exemple non limitatif, un mode de réalisation de l'invention.Other characteristics of the invention will appear on reading the description which follows and refers to the accompanying drawing which shows, by way of nonlimiting example, an embodiment of the invention.

L'unique figure de ce dessin représente schématiquement une installation pour la mise en oeuvre de l'invention comprenant essentiellement un sécheur-broyeur tubulaire rotatif 10, un broyeur à cylindres 12, un classificateur 14 et un séparateur-dépoussiéreur 16.The single figure in this drawing schematically represents an installation for implementing the invention essentially comprising a rotary tubular dryer-mill 10, a cylinder mill 12, a classifier 14 and a separator-dust collector 16.

Le sécheur-broyeur 10 est supporté et entrainé en rotation par des moyens conventionnels. Il comporte une entrée à chacune de ses extrémités et est divisé en une chambre de séchage 18, une chambre de pré-broyage 20 et une chambre de broyage fin 22. Les chambres 18 et 20 sont séparées par une cloison 24 munie de pales et d'une ouverture centrale permettant de transférer les produits d'une chambre à l'autre tout en empêchant les corps de broyage (boulets) contenus dans la chambre 20 de passer dans la chambre 18.The dryer-mill 10 is supported and rotated by conventional means. It has an inlet at each of its ends and is divided into a drying chamber 18, a pre-grinding chamber 20 and a fine grinding chamber 22. The chambers 18 and 20 are separated by a partition 24 provided with blades and d a central opening making it possible to transfer the products from one chamber to the other while preventing the grinding bodies (balls) contained in the chamber 20 from passing into the chamber 18.

Les chambres 20 et 22 sont séparées par une cloison pleine 26. Des orifices 28-30 sont ménagés dans la virole du broyeur, suivant deux rangées circulaires disposées de part et d'autre de la cloison 26. Des grilles 32-34 sont placées devant ces orifices pour empêcher le passage des corps de broyage et limiter la granulométrie des produits sortant des chambres 20 et 22.The chambers 20 and 22 are separated by a solid partition 26. Holes 28-30 are formed in the shell of the mill, in two circular rows arranged on either side of the partition 26. Grids 32-34 are placed in front these orifices to prevent the passage of the grinding bodies and limit the particle size of the products leaving the chambers 20 and 22.

Les orifices 28-30 débouchent dans des capots 36-38 entourant le broyeur. La partie inférieure de chacun de ces capots est en forme de trémie et est munie d'un orifice d'évacuation relié, directement ou par un moyen de transport quelconque, à la base d'un élévateur, par exemple à godets, 40-42. Un distributeur 44 placé sur l'orifice d'évacuation du capot 38 permet de diriger une partie des produits sortant de la chambre 22 vers l'élévateur 40.The orifices 28-30 open into covers 36-38 surrounding the grinder. The lower part of each of these hoods is in the form of a hopper and is provided with an evacuation orifice connected, directly or by any means of transport, to the base of an elevator, for example with buckets, 40-42. A distributor 44 placed on the evacuation orifice of the cover 38 makes it possible to direct a part of the products leaving the chamber 22 towards the elevator 40.

La partie haute des capots 36-38 est reliée à une unité de séparation - dépoussiérage schématisée en 16. Dans cette unité les gaz s'échappant des chambres 20 et 22, à travers les orifices 28-30 sont débarrassés des grains et poussières qu'ils transportent. En variante, les gaz captés par les capots 36 et 38 pourraient être traités dans deux unités séparées.The upper part of the covers 36-38 is connected to a separation-dedusting unit shown diagrammatically at 16. In this unit the gases escaping from the chambers 20 and 22, through the orifices 28-30 are freed from the grains and dust which they carry. Alternatively, the gases captured by the covers 36 and 38 could be treated in two separate units.

Le broyeur à cylindres 12 est conçu pour fonctionner en alimentation forcée. Dans ce mode de fonctionnement, l'écartement des cylindres est réglé à une valeur faible et le broyeur est alimenté avec un débit égal à plusieurs fois le débit théorique correspondant à cet écartement. Les cylindres sont alors écartés l'un de l'autre contre l'action des ressorts ou vérins, qui tendent à les rapprocher, et exercent sur la couche de matière comprimée entre les cylindres une pression 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 nombre de particules nettement plus fines que celles qui seraient obtenues par un broyage grain par grain.The roller mill 12 is designed to operate in forced feeding. In this operating mode, the spacing of the cylinders is adjusted to a low value and the mill is supplied with a flow rate equal to several times the theoretical flow rate corresponding to this spacing. The cylinders are then separated from each other against the action of the springs or jacks, which tend to bring them closer, and exert on the layer of compressed material between the cylinders a pressure all the greater as the flow of material is more important. There is then compaction and self-grinding within the layer of material and production of a large number of particles much finer than those which would be obtained by grinding grain by grain.

Le broyeur à cylindres 12 est alimenté par l'élévateur 40. Les produits broyés sont recueillis dans une trémie placée sous les cylindres et un distributeur 46 permet de les diviser en deux courants dont l'un est envoyé dans la chambre de broyage fin 22 du broyeur tubulaire et l'autre est recyclée, par exemple au moyen de l'élévateur 40.The roller mill 12 is supplied by the elevator 40. The crushed products are collected in a hopper placed under the cylinders and a distributor 46 makes it possible to divide them into two streams, one of which is sent to the fine grinding chamber 22 of the tubular crusher and the other is recycled, for example by means of the elevator 40.

Le classificateur 14 peut être un séparateur à air, statique ou dynamique, ou de tout autre type connu. Il est alimenté par l'élévateur 42 et comporte deux sorties : une sortie pour les produits fins (48), et une sortie pour les refus. Un distributeur 50 placé sur cette dernière sortie permet de recycler une fraction des refus dans la chambre de broyage fin 22 et de ramener l'autre fraction à l'entrée du broyeur à cylindres 12.The classifier 14 can be an air separator, static or dynamic, or of any other known type. It is supplied by the elevator 42 and has two outputs: an output for fine products (48), and an output for rejects. A distributor 50 placed on this last outlet makes it possible to recycle a fraction of the rejects in the fine grinding chamber 22 and to bring the other fraction to the inlet of the roller mill 12.

Dans le séparateur-dépoussiéreur 16, les particules relativement grosses sont séparées des poussières qui sont mélangées au produit fini, les premières étant envoyées soit à l'entrée du broyeur à cylindres 12, soit dans la chambre de broyage fin 22.In the separator-dust collector 16, the relatively large particles are separated from the dust which is mixed with the finished product, the first being sent either to the inlet of the roller mill 12 or to the fine grinding chamber 22.

Des ventilateurs non représentés assurent la circulation des gaz.Fans not shown ensure the circulation of gases.

Le fonctionnement de cette installation est le suivant : Le produit humide à broyer M est introduit avec un gaz chaud G dans la chambre 18 où il est séché; cette chambre peut être munie de releveurs ou autres organes améliorant les échanges thermiques. Le produit séché passe dans la chambre 20 qui contient des boulets assurant un prébroyage du produit jusqu'à une granulométrie adaptée au fonctionnement du broyeur à cylindres 12. Le produit ayant la granulométrie voulue traverse la grille 32, tombe dans le fond du capot 36, à travers les orifices 28, puis est repris par l'élévateur 40 et déversé dans la trémie 13 en charge sur le broyeur 12.The operation of this installation is as follows: The wet product to be ground M is introduced with a hot gas G into the chamber 18 where it is dried; this room can be provided with levers or other organs improving heat exchange. The dried product passes into chamber 20 which contains balls ensuring pre-grinding of the product up to a particle size suitable for the operation of the roller mill 12. The product having the desired particle size passes through the grid 32, falls into the bottom of the cover 36, through the orifices 28, then is taken up by the elevator 40 and discharged into the hopper 13 loaded on the mill 12 .

Dans le broyeur 12, le produit séché et prébroyé subit un broyage complémentaire avant d'être renvoyé dans la chambre 22 du broyeur tubulaire 10 où il est soumis à un broyage final par les boulets contenus dans cette chambre; une fraction du produit sortant du broyeur 12 peut être recyclée (liaison 47).In the crusher 12, the dried and pre-crushed product undergoes additional grinding before being returned to the chamber 22 of the tubular crusher 10 where it is subjected to a final grinding by the balls contained in this chamber; a fraction of the product leaving the mill 12 can be recycled (link 47).

Lorsque l'on effectue le broyage simultané de plusieurs produits et que l'un d'eux est très abrasif ou rhéologiquement plastique, par exemple le sable ou l'argile dans le cas des matières premières pour la production de clinker de ciment, celui-ci pourra être introduit directement en 52 dans la chambre 22 pour éviter l'abrasion des cylindres du broyeur 12 ou la réduction des performances du broyeur.When grinding several products simultaneously and one of them is very abrasive or rheologically plastic, for example sand or clay in the case of raw materials for the production of cement clinker, this this can be introduced directly at 52 into the chamber 22 to avoid abrasion of the cylinders of the crusher 12 or the reduction of the performance of the crusher.

Le produit ayant la granulométrie voulue traverse la grille 34 et tombe dans le fond du capot 38, à travers les orifices 30, et est repris par l'élévateur 42 qui alimente le classificateur 14.The product having the desired particle size crosses the grid 34 and falls into the bottom of the cover 38, through the orifices 30, and is taken up by the elevator 42 which supplies the classifier 14.

Du classificateur sortent, d'une part, le produit fini qui est évacué en 48 et, d'autre part, les refus qui sont renvoyés dans la chambre 22 du broyeur 10, soit en totalité, soit partiellement; dans ce dernier cas, l'autre fraction des refus est envoyée à l'alimentation du broyeur à cylindres 12 (liaison 51).On the one hand, the finished product leaves the finished product which is discharged at 48 and, on the other hand, the rejects which are returned to the chamber 22 of the mill 10, either wholly or partially; in the latter case, the other fraction of the refusals is sent to the supply to the roller mill 12 (link 51).

Une partie du produit sortant de la chambre 22 peut éventuellement être ramenée à l'entrée du broyeur 12 par le distributeur 44 et la liaison 45.A part of the product leaving the chamber 22 can optionally be brought back to the inlet of the mill 12 by the distributor 44 and the link 45.

Le gaz de séchage ayant traversé les chambres 18 et 20 et l'air de ventilation A ou les gaz nécessaires au séchage des produits humides abrasifs ou rhéologiquement plastiques admis dans la chambre 22 sont collectés dans les capots 36 et 38 et débarrassés des grains et poussières qu'ils transportent dans le séparateur-dépoussiéreur 16. Les fines particules sont mélangées aux produits finis et les grains plus gros sont renvoyés soit dans la chambre 22 du broyeur 10, soit dans le broyeur 12.The drying gas having passed through the chambers 18 and 20 and the ventilation air A or the gases necessary for drying the abrasive or rheologically plastic moist products admitted into the chamber 22 are collected in the covers 36 and 38 and freed of the grains and dust. which they transport in the separator-dust collector 16. The fine particles are mixed with the finished products and the larger grains are returned either to the chamber 22 of the mill 10, or to the mill 12.

Grâce au séchage préalable du produit à broyer et à son prébroyage, qui permet de réduire les morceaux concassés à une grosseur (5-20 mm par exemple) adaptée aux exigences de fonctionnement du broyeur à cylindres, il est possible d'effectuer une part importante du broyage dans le broyeur à cylindres, ce qui permet de diminuer notablement la consommation spécifique de l'installation. L'invention permet aussi d'augmenter de manière substantielle la capacité d'une installation existante à broyeur tubulaire, en lui adjoignant un broyeur à cylindres.Thanks to the preliminary drying of the product to be ground and to its pre-grinding, which makes it possible to reduce the crushed pieces to a size (5-20 mm for example) adapted to the operating requirements of the roller mill, it is possible to carry out a large proportion grinding in the cylinder mill, which significantly reduces the specific consumption of the installation. The invention also makes it possible to substantially increase the capacity of an existing installation with a tubular crusher, by adding a cylinder crusher to it.

Pour certaines applications, la chambre de prébroyage peut être supprimée ou confondue avec la chambre de séchage. La cloison pleine 26 pourrait être supprimée, les orifices 28 et 30 étant confondus et les capots 36 et 38 remplacés par un capot unique; dans ce cas, les produits recueillis au fond du capot seront partagés entre le broyeur à cylindres et le classificateur.For certain applications, the pre-grinding chamber can be omitted or confused with the drying chamber. The solid partition 26 could be eliminated, the orifices 28 and 30 being combined and the covers 36 and 38 replaced by a single cover; in this case, the products collected at the bottom of the hood will be shared between the cylinder crusher and the classifier.

D'autres modifications peuvent être apportées à la forme de réalisation décrite par l'emploi de moyens techniques équivalents, et il est bien entendu que ces modifications entrent dans le cadre de l'invention.Other modifications can be made to the embodiment described by the use of equivalent technical means, and it is understood that these modifications come within the scope of the invention.

Claims (11)

1. Procédé de séchage et de broyage d'un produit humide selon lequel les opérations de séchage, de prébroyage et de broyage fin sont effectuées dans un même broyeur tubulaire rotatif divisé en plusieurs chambres et muni d'une entrée à chacune de ses extrémités et d'orifices de sortie périphériques situés entre les chambres de prébroyage et de broyage fin, caractérisé en ce qu'au moins une fraction du produit séché et partiellement broyé sortant de la chambre de prébroyage (20) est soumis à un broyage par écrasement dans un broyeur à cylindres à alimentation forcée (12) et au moins une fraction du produit sortant dudit broyeur à cylindres est introduit dans la chambre de broyage fin (22) dudit broyeur tubulaire (10).1. Method for drying and grinding a wet product according to which the drying, pre-grinding and fine grinding operations are carried out in the same rotary tubular grinder divided into several chambers and provided with an inlet at each of its ends and peripheral outlet orifices located between the pre-grinding and fine grinding chambers, characterized in that at least a fraction of the dried and partially ground product leaving the pre-grinding chamber (20) is subjected to crushing by crushing in a forced feed roll mill (12) and at least a fraction of the product leaving said roll mill is introduced into the fine grinding chamber (22) of said tubular mill (10). 2. Procédé selon la revendication 1, caractérisé en ce qu'une fraction du produit sortant du broyeur à cylindres (12) est recyclée à l'entrée dudit broyeur.2. Method according to claim 1, characterized in that a fraction of the product leaving the cylinder mill (12) is recycled at the inlet of said mill. 3. Procédé selon la revendication 1 ou 2, selon lequel le produit broyé sortant de la chambre de broyage fin (22) est classé en une fraction fine, constituant le produit fini, et une fraction grossière caractérisé en ce que ladite fraction grossière est divisée en deux parties qui sont dirigées, respectivement, vers la chambre de broyage fin (22) et vers le broyeur à cylindres (12).3. Method according to claim 1 or 2, wherein the ground product leaving the fine grinding chamber (22) is classified into a fine fraction, constituting the finished product, and a coarse fraction characterized in that said coarse fraction is divided in two parts which are directed, respectively, towards the fine grinding chamber (22) and towards the roller mill (12). 4. Procédé selon la revendication 1, 2 ou 3, caractérisé en ce qu'une fraction du produit broyé sortant de la chambre de broyage fin (22) est renvoyée à l'entrée du broyeur à cylindres (12).4. Method according to claim 1, 2 or 3, characterized in that a fraction of the ground product leaving the fine grinding chamber (22) is returned to the inlet of the roller mill (12). 5. Procédé selon l'une quelconque des revendications précédentes, pour le séchage et le broyage d'au moins deux produits dont l'un est fortement abrasif ou rhéologiquement plastique caractérisé en ce que ledit produit est introduit directement dans la chambre de broyage fin (22).5. Method according to any one of the preceding claims, for drying and grinding at least two products, one of which is highly abrasive or rheologically plastic, characterized in that said product is introduced directly into the fine grinding chamber ( 22). 6. Procédé selon l'une quelconque des revendications précédentes et suivant lequel les chambres de séchage, de prébroyage et de broyage fin sont balayées par des gaz qui s'échappent à travers lesdits orifices périphériques et sont traités pour séparer les particules solides qu'ils transportent, caractérisé en ce qu'une fraction au moins des particules de granulométrie supérieure qui sont séparées des gaz est renvoyée à l'entrée du broyeur à cylindres (12).6. Method according to any one of the preceding claims and according to which the drying, pre-grinding and fine grinding chambers are swept by gases which escape through said peripheral orifices and are treated to separate the solid particles which they transport, characterized in that at least a fraction of the particles of greater particle size which are separated from the gases is returned to the inlet of the roller mill (12). 7. Installation pour la mise en oeuvre du procédé de séchage et broyage selon l'une quelconque des revendications 1 à 6, comportant un broyeur tubulaire rotatif (10) comprenant une chambre de prébroyage (20) et une chambre de broyage fin (22) et muni d'une entrée à chacune de ses extrémités et d'orifices de sortie périphériques (28-30) situés entre les chambres de prébroyage et de broyage fin, et un classificateur (14) dont l'entrée est reliée à la sortie de la chambre de broyage fin, caractérisée en ce qu'elle comporte, en outre, un broyeur à cylindres (12) conçu pour fonctionner en alimentation forcée, dont l'entrée est reliée à la sortie de la chambre de prébroyage (20) et dont la sortie est reliée à l'entrée de la chambre de broyage fin (22).7. Installation for implementing the drying and grinding process according to any one of claims 1 to 6, comprising a rotary tubular grinder (10) comprising a pre-grinding chamber (20) and a fine grinding chamber (22) and provided with an inlet at each of its ends and peripheral outlet orifices (28-30) situated between the pre-grinding and fine-grinding chambers, and a classifier (14) whose inlet is connected to the outlet of the fine grinding chamber, characterized in that it further comprises a roller mill (12) designed to operate as a forced feed, the inlet of which is connected to the outlet of the pre-grinding chamber (20) and of which the outlet is connected to the inlet of the fine grinding chamber (22). 8. Installation selon la revendication 7 caractérisée en ce qu'elle comporte un distributeur (46) placé sur la sortie du broyeur à cylindres (12) et apte à répartir le débit de produit broyé entre deux sorties respectivement reliées aux entrées dudit broyeur à cylindres et de la chambre de broyage fin (22).8. Installation according to claim 7 characterized in that it comprises a distributor (46) placed on the outlet of the roller mill (12) and capable of distributing the flow of ground product between two outlets respectively connected to the inlets of said roller mill and the fine grinding chamber (22). 9. Installation selon la revendication 7 ou 8, caractérisée en ce qu'elle comporte un distributeur (50) placé sur la sortie des refus du classificateur (14) et apte à répartir les refus entre deux sorties respectivement reliées aux entrées dudit broyeur à cylindres (12) et de la chambre de broyage fin (22).9. Installation according to claim 7 or 8, characterized in that it comprises a distributor (50) placed on the rejection outlet of the classifier (14) and capable of distributing the rejection between two outputs respectively connected to the inputs of said roller mill (12) and the fine grinding chamber (22). 10. Installation selon la revendication 7, 8 ou 9, caractérisée en ce qu'elle comporte un distributeur (44) placé sur la sortie de la chambre de broyage fin (22) et apte à répartir le produit broyé entre deux sorties reliées respectivement aux entrées du broyeur à cylindres (12) et du classificateur (14).10. Installation according to claim 7, 8 or 9, characterized in that it comprises a distributor (44) placed on the outlet of the fine grinding chamber (22) and capable of distributing the ground product between two outlets connected respectively to the inlets of the roller mill (12) and of the classifier (14). 11. Installation selon la revendication 7, 8, 9 ou 10, caractérisée en ce que les chambres de prébroyage (20) et de broyage fin (22) sont séparées par une cloison pleine (26).11. Installation according to claim 7, 8, 9 or 10, characterized in that the pre-grinding (20) and fine grinding (22) chambers are separated by a solid partition (26).
EP89402783A 1988-10-21 1989-10-10 Process for grinding and drying wet minerals, and equipment for carrying out this process Withdrawn EP0366516A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8813814 1988-10-21
FR8813814A FR2638105A1 (en) 1988-10-21 1988-10-21 PROCESS FOR DRYING AND MILLING WET MINERAL MATERIALS AND INSTALLATION FOR CARRYING OUT SAID METHOD

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0715893A1 (en) * 1994-12-07 1996-06-12 Klöckner-Humboldt-Deutz Aktiengesellschaft Closed-circuit grinding plant
MD4131C1 (en) * 2010-10-25 2012-05-31 Государственный Университет Молд0 Device for palladium extraction from spent automotive catalysts
CN103263963A (en) * 2013-04-22 2013-08-28 薛运河 Wet-to-dry dispersant-free method for producing ultrafine nanoscale dry powder and involved device

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR3091661B1 (en) 2019-01-14 2020-12-18 Fives Fcb Grinding and drying device

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CH413562A (en) * 1962-12-12 1966-05-15 Polysius Gmbh Mill drying process and tube mill for carrying out the process
DE3518543A1 (en) * 1985-05-23 1986-11-27 Klöckner-Humboldt-Deutz AG, 5000 Köln Method and device for comminuting and grinding brittle material for grinding, such as for example cement clinker, ore, coal or the like

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH413562A (en) * 1962-12-12 1966-05-15 Polysius Gmbh Mill drying process and tube mill for carrying out the process
DE3518543A1 (en) * 1985-05-23 1986-11-27 Klöckner-Humboldt-Deutz AG, 5000 Köln Method and device for comminuting and grinding brittle material for grinding, such as for example cement clinker, ore, coal or the like

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0715893A1 (en) * 1994-12-07 1996-06-12 Klöckner-Humboldt-Deutz Aktiengesellschaft Closed-circuit grinding plant
MD4131C1 (en) * 2010-10-25 2012-05-31 Государственный Университет Молд0 Device for palladium extraction from spent automotive catalysts
CN103263963A (en) * 2013-04-22 2013-08-28 薛运河 Wet-to-dry dispersant-free method for producing ultrafine nanoscale dry powder and involved device
CN103263963B (en) * 2013-04-22 2015-07-01 薛运河 Wet-to-dry dispersant-free method for producing ultrafine nanoscale dry powder and involved device

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