EP0675762A1 - Method and plant for grinding old brasques and similar products - Google Patents

Method and plant for grinding old brasques and similar products

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Publication number
EP0675762A1
EP0675762A1 EP94928436A EP94928436A EP0675762A1 EP 0675762 A1 EP0675762 A1 EP 0675762A1 EP 94928436 A EP94928436 A EP 94928436A EP 94928436 A EP94928436 A EP 94928436A EP 0675762 A1 EP0675762 A1 EP 0675762A1
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EP
European Patent Office
Prior art keywords
crusher
grinding
products
finished product
cone
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.)
Granted
Application number
EP94928436A
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German (de)
French (fr)
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EP0675762B1 (en
Inventor
Francis Desrumaux
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F C B
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F C B
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Publication date
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Publication of EP0675762A1 publication Critical patent/EP0675762A1/en
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Publication of EP0675762B1 publication Critical patent/EP0675762B1/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
    • B03B9/00—General arrangement of separating plant, e.g. flow sheets
    • B03B9/04—General arrangement of separating plant, e.g. flow sheets specially adapted for furnace residues, smeltings, or foundry slags
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25C—PROCESSES FOR THE ELECTROLYTIC PRODUCTION, RECOVERY OR REFINING OF METALS; APPARATUS THEREFOR
    • C25C3/00—Electrolytic production, recovery or refining of metals by electrolysis of melts
    • C25C3/06—Electrolytic production, recovery or refining of metals by electrolysis of melts of aluminium
    • C25C3/08—Cell construction, e.g. bottoms, walls, cathodes
    • C25C3/085—Cell construction, e.g. bottoms, walls, cathodes characterised by its non electrically conducting heat insulating parts

Definitions

  • Old pot liners are carbon products that come from the demolition of the coating of the walls and the bottom of the alumina electrolysis tanks constituting the cathode. This coating wears and deteriorates and it is necessary to replace it periodically with a new coating.
  • the coating demolition operation called debridging, is carried out using pneumatic tools and produces large blocks which may contain inclusions of metals such as iron or aluminum. These blocks are then brought back by conventional means to a size which allows passage through a square mesh grid of approximately 400 mm.
  • the old pot lining is heavily impregnated with harmful products, such as fluorides and cyanides.
  • harmful products such as fluorides and cyanides.
  • new regulations on pollution and environmental protection oblige to treat them, for example to calcine them, to eliminate harmful products and possibly allow the recovery of carbonaceous constituents .
  • the invention relates more particularly to aluminum production plants in which the treatment of old pot lining requires a prior reduction of these pot lining into pieces whose size does not exceed a few millimeters, and relates to a process and a grinding installation. allowing this result to be achieved with only two reduction stages and one screening.
  • the process which is the subject of the present invention is characterized in that it comprises a crushing operation in which the old pot lining is reduced to pieces whose dimensions do not exceed 50 mm, a screening operation making it possible to separate the grains having a size of a few millimeters and constituting the finished product, and a grinding operation making it possible to reduce the rejection of screening to the dimensions of the finished product.
  • the grains of the finished product will all have dimensions of less than 2.5-3 mm.
  • the products of the grinding operation can be sent back to screening.
  • the installation for implementing the invention is characterized in that it comprises a crusher, a screen whose mesh size corresponds to that of the finished product, a vibrating cone crusher, means for transporting to screens the products leaving the crusher and possibly those leaving the crusher and means for returning rejects from the screen to the entry of the crusher.
  • the vibrating cone crusher is a crusher in which the cone or the tank is vibrated, the other element, tank or cone, of the crusher being fixed or mobile. Grinders of this type are capable of a high reduction ratio compared to conventional cone mills, the movements of the cone of which are controlled by an eccentric.
  • the crusher may be a jaw crusher in which the jaws form an angle of less than 20 ° between them. This reduced angle favors the taking of reputed soapy products such as old pot lining.
  • FIG. 1 is the diagram of an installation for grinding old pot lining designed according to the invention
  • Figure 2 is a vertical sectional view of a vibrating cone crusher
  • FIG. 3 is the diagram of another installation according to the invention.
  • the installation of FIG. 1 consists essentially of a feed hopper 10, a jaw crusher 12, a vibrating cone crusher 14, a screen 16, two endless belt conveyors 18 and 20, an elevator 22, a dust filter 24 and a silo 26.
  • the hopper 10 is provided with a vibrating extractor 28 which makes it possible to load the blocks with which it is filled on the conveyor 18 supplying the crusher 12.
  • Magnetic separators 30 and eddy current separators 31, making it possible to eliminate scrap and other metal parts are placed on the conveyors 18 and 20 and / or at their jetty.
  • Crusher 12 is a single acting jaw crusher. This device is of conventional construction except for the angle formed by the jaws between them which is equal to about 16 ° and significantly less than that usually adopted on this type of crusher. This reduced angle favors the taking of pondered soapy products such as old pot lining.
  • the inlet opening of the crusher 12 is sufficient to absorb blocks passing through a 400 mm square mesh grid and its outlet opening is dimensioned so that the blocks are reduced to pieces having practically all dimensions less than 50 mm. about.
  • This result which corresponds to a reduction rate of the order of 8, is achieved not only thanks to a suitable dimensioning of the inlet and outlet openings, but also thanks to the fact that a jaw stroke is adopted.
  • mobile reduced so that the throughput of the crusher is significantly lower than that of a conventional cone crusher of the same size, for example 10T / H instead of 50-60 T / H.
  • the crushed product is loaded on the conveyor 20 and transported by the latter and the elevator 22 to the screen 16.
  • the latter is equipped with a mesh grid of a few millimeters on a side, for example 3 mm.
  • the products having passed through this grid are stored in the silo 26.
  • the screen 16 is also equipped with an upper grid with 50 mm mesh which makes it possible to recover and eliminate any enormous, mainly pieces of aluminum, which were crushed and rejected by the crusher 14.
  • the refusals of the screen 16, the dimensions of which are greater than 3 mm, are sent to a buffer hopper 32 which feeds the crusher 14 and makes it possible to keep it constantly loaded, which is an essential condition for its effectiveness.
  • the crusher 14, shown in FIG. 2, is constituted, like the conventional cone crushers, by a frame 40 carrying at its upper part a tank 42 in which is fixed a wearing part 44 in the form of a hollow cone trunk, called concave, and by a cone 46 placed inside the concave and resting on a spherical surface whose center is located on the axis of the concave and which allows the cone to rotate around its axis and to make a gyratory movement inside the concave.
  • the movements of the cone are controlled by an eccentric
  • these movements are caused by an eccentric mass 48 rotatably mounted on the tail of the cone and driven in rotation by a motor 50.
  • This crusher has a reduction ratio of around 20, significantly higher than that of a conventional cone crusher.
  • the products leaving the crusher 14 are loaded onto the conveyor 20 and transported, with the products leaving the crusher 12, to the screen 16.
  • the designation vibrating cone crusher used in this description includes all cone crushers where one of the elements , cone or tank, or both are vibrated by any suitable means, not imposing a predetermined path on said element.
  • the jaw crusher could be replaced by other devices capable of reduce 400 mm blocks into pieces of 50 mm or smaller.
  • This device which consists of a drum with a horizontal axis whose diameter is greater than the length and which is rotated about its axis, by appropriate means, is fed through a central opening provided on one of the bottoms and features on. its wall, near the other bottom, openings whose dimensions are chosen so as to allow only the pieces whose size is less than the desired maximum size to pass.
  • FIG. 3 shows the diagram of an installation comprising an autogenous crusher designated by the reference number 12 '. All the other devices of this installation are designated by the same reference number as in FIG. 1.
  • the crusher 12 ′ has on one of its bottoms a central opening into which a feed chute opens. 28, and openings are provided on its cylindrical wall, near the other bottom, for the evacuation of the ground products. These openings are surrounded by an annular casing provided at its base with an airlock for the evacuation of the ground products and connected to the suction of a fan through the filter 24.
  • the fine fraction of the ground product is entrained by the air flow circulating in the grinder and recovered in the filter.
  • the fine crushed products could be discharged pneumatically through a central opening in the bottom of the mill adjacent to the peripheral openings.
  • the autogenous crusher 12 'reduces the blocks by 400 mm into pieces whose size is around 30 mm and the vibrating cone crusher 14 operates in open circuit (without screening of the crushed products and recycling of rejects), the crushed products practically all having a size less than 3 mm.
  • the invention is not limited to the grinding of old pot lining but also applies to similar materials, polluted by metals and / or harmful products, such as cyanides, fluorides, etc., for example briquetting or refractory linings of steel blast furnaces or metallurgical furnaces.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Crushing And Grinding (AREA)
  • Crushing And Pulverization Processes (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Electrolytic Production Of Metals (AREA)
  • Disintegrating Or Milling (AREA)

Abstract

The invention relates to aluminium production plants where processing of old brasques (carbonated products resulting from the demolition of alumina electrolytic cell wall and bottom linings) calls for preliminary reduction of the brasques to small pieces of only a few milimetres in size. The grinding process disclosed involves a crushing operation (12) to reduce the old brasques to pieces no bigger than 50 mm, screening (16) for separating out particles a few milimetres in size and constituting the finished product, and grinding (14) for reducing oversize material to finished product dimensions.

Description

PROCÉDÉ ET INSTALLATION POUR LE BROYAGE DE VIEILLES BRASQUES METHOD AND INSTALLATION FOR THE CRUSHING OF OLD ARMS
ET DE PRODUITS SIMILAIRESAND SIMILAR PRODUCTS
Les vieilles brasques sont des produits carbonés qui proviennent de la démolition du revêtement des parois et du fond des cuves d'électrolyse de l'alumine constituant la cathode. Ce revêtement s'use et se détériore et il est nécessaire de le remplacer périodiquement par un revêtement neuf. L'opération de démolition du revêtement, appelée débrasquage, est effectuée au moyen d'outils pneumatiques et produit des blocs de forte taille pouvant contenir des inclusions de métaux tels que le fer ou l'aluminium. Ces blocs sont ensuite ramenés par des moyens classiques à une taille qui permet le passage à travers une grille à maille carrée de 400 mm environ.Old pot liners are carbon products that come from the demolition of the coating of the walls and the bottom of the alumina electrolysis tanks constituting the cathode. This coating wears and deteriorates and it is necessary to replace it periodically with a new coating. The coating demolition operation, called debridging, is carried out using pneumatic tools and produces large blocks which may contain inclusions of metals such as iron or aluminum. These blocks are then brought back by conventional means to a size which allows passage through a square mesh grid of approximately 400 mm.
Les vieilles brasques sont fortement imprégnées de produits nocifs, tels que des fluorures et des cyanures. Jusqu'à présent, elles étaient mises en décharge, mais les nouvelles réglementations sur la pollution et la protection de l'environnement obligent à les traiter, par exemple à les calciner, pour en éliminer les produits nocifs et éventuellement permettre la récupération des constituants carbonés.The old pot lining is heavily impregnated with harmful products, such as fluorides and cyanides. Until now, they were landfilled, but new regulations on pollution and environmental protection oblige to treat them, for example to calcine them, to eliminate harmful products and possibly allow the recovery of carbonaceous constituents .
L'invention concerne plus particulièrement les usines de production d'aluminium dans lesquelles le traitement des vieilles brasques exige une réduction préalable de ces brasques en morceaux dont la taille n'excède pas quelques millimètres, et a pour objet un procédé et une installation de broyage permettant d'atteindre ce résultat avec seulement deux étages de réduction et un criblage.The invention relates more particularly to aluminum production plants in which the treatment of old pot lining requires a prior reduction of these pot lining into pieces whose size does not exceed a few millimeters, and relates to a process and a grinding installation. allowing this result to be achieved with only two reduction stages and one screening.
Le procédé objet de la présente invention est caractérisé en ce qu'il comporte une opération de concassage dans laquelle les vieilles brasques sont réduites en morceaux dont les dimensions n'excèdent pas 50 mm, une opération de criblage permettant de séparer les grains ayant une taille de quelques millimètres et constituant le produit fini, et une opération de broyage permettant de réduire les refus du criblage aux dimensions du produit fini. De préférence, les grains du produit fini auront tous des dimensions inférieures à 2,5-3 mm. Les produits de l'opération de broyage pourront être renvoyés au criblage.The process which is the subject of the present invention is characterized in that it comprises a crushing operation in which the old pot lining is reduced to pieces whose dimensions do not exceed 50 mm, a screening operation making it possible to separate the grains having a size of a few millimeters and constituting the finished product, and a grinding operation making it possible to reduce the rejection of screening to the dimensions of the finished product. Preferably, the grains of the finished product will all have dimensions of less than 2.5-3 mm. The products of the grinding operation can be sent back to screening.
L'installation pour la mise en oeuvre de l'invention est caractérisée en ce qu'elle comporte un concasseur, un crible dont la dimension des mailles correspond à celle du produit fini, un broyeur vibrant à cône, des moyens pour transporter jusqu'au crible les produits sortant du concasseur et éventuellement ceux sortant du broyeur et des moyens pour renvoyer les refus du crible à l'entrée du broyeur. Le broyeur vibrant à cône est un broyeur dans lequel le cône ou la cuve est mis en vibrations, l'autre élément, cuve ou cône, du broyeur étant fixe ou mobile. Les broyeurs de ce type sont capables d'un rapport de réduction élevé par rapport aux broyeurs à cône classiques dont les mouvements du cône sont commandés par un excentrique. Le concasseur pourra être un concasseur à mâchoires dans lequel les mâchoires forment entre elles un angle inférieur à 20°. Cet angle réduit favorise la prise des produits réputés savonneux comme les vieilles brasques.The installation for implementing the invention is characterized in that it comprises a crusher, a screen whose mesh size corresponds to that of the finished product, a vibrating cone crusher, means for transporting to screens the products leaving the crusher and possibly those leaving the crusher and means for returning rejects from the screen to the entry of the crusher. The vibrating cone crusher is a crusher in which the cone or the tank is vibrated, the other element, tank or cone, of the crusher being fixed or mobile. Grinders of this type are capable of a high reduction ratio compared to conventional cone mills, the movements of the cone of which are controlled by an eccentric. The crusher may be a jaw crusher in which the jaws form an angle of less than 20 ° between them. This reduced angle favors the taking of reputed soapy products such as old pot lining.
A la place du concasseur à mâchoires, on pourra utiliser un broyeur autogène ou semi- autogène à sortie périphérique. D'autres caractéristiques de l'invention apparaîtront à la lecture de la description qui suit et se réfère aux dessins l'accompagnant qui montrent, à titre d'exemple non limitatif, deux formes de réalisation de l'invention. Sur ces dessins :Instead of the jaw crusher, an autogenous or semi-autogenous crusher with peripheral output can be used. Other characteristics of the invention will appear on reading the description which follows and refers to the accompanying drawings which show, by way of nonlimiting example, two embodiments of the invention. In these drawings:
La figure 1 est le schéma d'une installation de broyage de vieilles brasques conçue selon l'invention; La figure 2 est une vue en coupe verticale d'un broyeur vibrant à cône; etFIG. 1 is the diagram of an installation for grinding old pot lining designed according to the invention; Figure 2 is a vertical sectional view of a vibrating cone crusher; and
La figure 3 est le schéma d'une autre installation conforme à l'invention. L'installation de la figure 1 est constituée essentiellement par une trémie d'alimentation 10, un concasseur à mâchoires 12, un broyeur vibrant à cône 14, un crible 16, deux transporteurs à bande sans fin 18 et 20, un élévateur 22, un filtre de dépoussiérage 24 et un silo 26.Figure 3 is the diagram of another installation according to the invention. The installation of FIG. 1 consists essentially of a feed hopper 10, a jaw crusher 12, a vibrating cone crusher 14, a screen 16, two endless belt conveyors 18 and 20, an elevator 22, a dust filter 24 and a silo 26.
La trémie 10 est munie d'un extracteur vibrant 28 qui permet de charger les blocs dont elle est remplie sur le transporteur 18 alimentant le concasseur 12. Des séparateurs magnétiques 30 et des séparateurs à courants de Foucault 31, permettant d'éliminer les ferrailles et autres pièces métalliques, sont placés sur les transporteurs 18 et 20 et/ou à leur jetée. Le concasseur 12 est un concasseur à mâchoires à simple effet. Cet appareil est de construction classique sauf en ce qui concerne l'angle que forment les mâchoires entre elles qui est égal à environ 16° et nettement inférieur à celui habituellement adopté sur ce type de concasseur. Cet angle réduit favorise la prise des produits réputés savonneux comme les vieilles brasques. L'ouverture d'entrée du concasseur 12 est suffisante pour absorber des blocs passant à travers une grille à maille carrée de 400 mm et son ouverture de sortie est dimensionnée pour que les blocs soient réduits en morceaux ayant pratiquement tous des dimensions inférieures à 50 mm environ. Ce résultat, qui correspond à un taux de réduction de l'ordre de 8, est atteint non seulement grâce à un dimensionnement convenable des ouvertures d'entrée et de sortie, mais aussi grâce au fait que l'on adopte une course de la mâchoire mobile réduite de telle sorte que le débit du concasseur soit nettement inférieur à celui d'un concasseur à cône classique de même dimension, par exemple 10T/H au lieu de 50-60 T/H.The hopper 10 is provided with a vibrating extractor 28 which makes it possible to load the blocks with which it is filled on the conveyor 18 supplying the crusher 12. Magnetic separators 30 and eddy current separators 31, making it possible to eliminate scrap and other metal parts are placed on the conveyors 18 and 20 and / or at their jetty. Crusher 12 is a single acting jaw crusher. This device is of conventional construction except for the angle formed by the jaws between them which is equal to about 16 ° and significantly less than that usually adopted on this type of crusher. This reduced angle favors the taking of reputed soapy products such as old pot lining. The inlet opening of the crusher 12 is sufficient to absorb blocks passing through a 400 mm square mesh grid and its outlet opening is dimensioned so that the blocks are reduced to pieces having practically all dimensions less than 50 mm. about. This result, which corresponds to a reduction rate of the order of 8, is achieved not only thanks to a suitable dimensioning of the inlet and outlet openings, but also thanks to the fact that a jaw stroke is adopted. mobile reduced so that the throughput of the crusher is significantly lower than that of a conventional cone crusher of the same size, for example 10T / H instead of 50-60 T / H.
Le produit concassé est chargé sur le transporteur 20 et transporté par celui-ci et l'élévateur 22 jusqu'au crible 16. Celui-ci est équipé d'une grille à mailles de quelques millimètres de côté, par exemple 3 mm. Les produits ayant traversé cette grille sont stockés dans le silo 26. Le crible 16 est aussi équipé d'une grille supérieure à mailles de 50 mm qui permet de récupérer et d'éliminer d'éventuels imbroyables, principalement des morceaux d'aluminium, qui auraient été écrasés et rejetés par le broyeur 14.The crushed product is loaded on the conveyor 20 and transported by the latter and the elevator 22 to the screen 16. The latter is equipped with a mesh grid of a few millimeters on a side, for example 3 mm. The products having passed through this grid are stored in the silo 26. The screen 16 is also equipped with an upper grid with 50 mm mesh which makes it possible to recover and eliminate any unbelievable, mainly pieces of aluminum, which were crushed and rejected by the crusher 14.
Les refus du crible 16, dont les dimensions sont supérieures à 3 mm, sont envoyés dans une trémie tampon 32 qui alimente le broyeur 14 et permet de le maintenir en charge en permanence, ce qui est une condition essentielle de son efficacité.The refusals of the screen 16, the dimensions of which are greater than 3 mm, are sent to a buffer hopper 32 which feeds the crusher 14 and makes it possible to keep it constantly loaded, which is an essential condition for its effectiveness.
Le broyeur 14, représenté sur la figure 2, est constitué, comme les broyeurs à cône classiques, par un bâti 40 portant à sa partie supérieure une cuve 42 dans laquelle est fixée une pièce d'usure 44 en forme de tronc de cône creux, appelée concave, et par un cône 46 placé à l'intérieur du concave et reposant sur une surface sphérique dont le centre est situé sur l'axe du concave et qui permet au cône de tourner autour de son axe et d'effectuer un mouvement giratoire à l'intérieur du concave. Alors que dans les broyeurs à cône classiques, les mouvements du cône sont commandés par un excentrique, dans le broyeur 14 ces mouvements sont provoqués par une masse excentrée 48 montée rotative sur la queue du cône et entraînée en rotation par un moteur 50. Ce broyeur a un rapport de réduction de l'ordre de 20, nettement plus élevé que celui d'un broyeur à cône classique.The crusher 14, shown in FIG. 2, is constituted, like the conventional cone crushers, by a frame 40 carrying at its upper part a tank 42 in which is fixed a wearing part 44 in the form of a hollow cone trunk, called concave, and by a cone 46 placed inside the concave and resting on a spherical surface whose center is located on the axis of the concave and which allows the cone to rotate around its axis and to make a gyratory movement inside the concave. Whereas in conventional cone crushers, the movements of the cone are controlled by an eccentric, in the crusher 14 these movements are caused by an eccentric mass 48 rotatably mounted on the tail of the cone and driven in rotation by a motor 50. This crusher has a reduction ratio of around 20, significantly higher than that of a conventional cone crusher.
Les produits sortant du broyeur 14 sont chargés sur le transporteur 20 et transportés, avec les produits sortant du concasseur 12, jusqu'au crible 16.The products leaving the crusher 14 are loaded onto the conveyor 20 and transported, with the products leaving the crusher 12, to the screen 16.
Bien que dans l'exemple décrit, ce soit le cône du broyeur qui est mis en vibration au moyen d'une masse excentrée rotative, la dénomination broyeur vibrant à cône utilisée dans cette description englobe tous les broyeurs à cône où l'un des éléments, cône ou cuve, ou les deux sont mis en vibrations par tout moyen approprié, n'imposant pas une trajectoire prédéterminée audit élément.Although in the example described, it is the cone of the crusher which is vibrated by means of a rotary eccentric mass, the designation vibrating cone crusher used in this description includes all cone crushers where one of the elements , cone or tank, or both are vibrated by any suitable means, not imposing a predetermined path on said element.
Le concasseur à mâchoires pourrait être remplacé par d'autres appareils capables de réduire des blocs de 400 mm en morceaux de 50 mm ou plus petits. On pourrait, en particulier, utiliser un broyeur autogène ou semi-autogène à sortie périphérique. Cet appareil, qui est constitué par un tambour à axe horizontal dont le diamètre est supérieur à la longueur et qui est entraîné en rotation autour de son axe, par des moyens appropriés, est alimenté à travers une ouverture centrale prévue sur l'un des fonds et comporte sur. sa paroi, près de l'autre fond, des ouvertures dont les dimensions sont choisies pour ne laisser passer que les morceaux dont la taille est inférieure à la taille maximale désirée.The jaw crusher could be replaced by other devices capable of reduce 400 mm blocks into pieces of 50 mm or smaller. One could, in particular, use an autogenous or semi-autogenic mill with peripheral output. This device, which consists of a drum with a horizontal axis whose diameter is greater than the length and which is rotated about its axis, by appropriate means, is fed through a central opening provided on one of the bottoms and features on. its wall, near the other bottom, openings whose dimensions are chosen so as to allow only the pieces whose size is less than the desired maximum size to pass.
La figure 3 montre le schéma d'une installation comportant un broyeur autogène désigné par le numéro de référence 12'. Tous les autres appareils de cette installation sont désignés par le même numéro de référence que sur la figure 1. Dans l'installation représentée, le broyeur 12' comporte sur l'un de ses fonds une ouverture centrale dans laquelle débouche une goulotte d'alimentation 28, et des ouvertures sont ménagées sur sa paroi cylindrique, près de l'autre fond, pour l'évacuation des produits broyés. Ces ouvertures sont entourées d'un carter annulaire muni à sa base d'un sas pour l'évacuation des produits broyés et relié à l'aspiration d'un ventilateur à travers le filtre 24. La fraction fine du produit broyé est entraînée par le courant d'air circulant dans le broyeur et récupérée dans le filtre. En variante, les produits broyés fins pourraient être évacués pneumatiquement à travers une ouverture centrale du fond du broyeur adjacent aux ouvertures périphériques.FIG. 3 shows the diagram of an installation comprising an autogenous crusher designated by the reference number 12 '. All the other devices of this installation are designated by the same reference number as in FIG. 1. In the installation shown, the crusher 12 ′ has on one of its bottoms a central opening into which a feed chute opens. 28, and openings are provided on its cylindrical wall, near the other bottom, for the evacuation of the ground products. These openings are surrounded by an annular casing provided at its base with an airlock for the evacuation of the ground products and connected to the suction of a fan through the filter 24. The fine fraction of the ground product is entrained by the air flow circulating in the grinder and recovered in the filter. Alternatively, the fine crushed products could be discharged pneumatically through a central opening in the bottom of the mill adjacent to the peripheral openings.
Le broyeur autogène 12' réduit les blocs de 400 mm en morceaux dont la taille est de l'ordre de 30 mm et le broyeur vibrant à cône 14 fonctionne en circuit ouvert (sans criblage des produits broyés et recyclage des refus), les produits broyés ayant pratiquement tous une taille inférieure à 3 mm.The autogenous crusher 12 'reduces the blocks by 400 mm into pieces whose size is around 30 mm and the vibrating cone crusher 14 operates in open circuit (without screening of the crushed products and recycling of rejects), the crushed products practically all having a size less than 3 mm.
Il est bien entendu que toutes les modifications qui peuvent être apportées aux formes de réalisation décrites ci-dessus par l'emploi de moyens techniques équivalents entrent dans le cadre de l'invention.It is understood that all the modifications which can be made to the embodiments described above by the use of equivalent technical means fall within the scope of the invention.
Par ailleurs, l'invention n'est pas limitée au broyage de vieilles brasques mais s'applique aussi aux matériaux similaires, pollués par des métaux et/ou des produits nocifs, tels que cyanures, fluorures, etc., par exemple aux briquetages ou revêtements réfractaires des hauts- fourneaux sidérurgiques ou des fours métallurgiques. Furthermore, the invention is not limited to the grinding of old pot lining but also applies to similar materials, polluted by metals and / or harmful products, such as cyanides, fluorides, etc., for example briquetting or refractory linings of steel blast furnaces or metallurgical furnaces.

Claims

REVENDICATIONS
1. Procédé pour le broyage de vieilles brasques ou de produits similaires, comportant une opération de concassage, une opération de criblage permettant de séparer du produit concassé les grains ayant les dimensions du produit fini, et une opération de broyage permettant de réduire-les produits du criblage aux dimensions du produit fini, caractérisé en ce que le broyage est effectué dans un broyeur vibrant à cône dont le rapport de réduction est nettement plus grand que celui d'un broyeur à cône classique et en ce que les dimensions des grains du produit fini n'excèdent pas 2,5-3 mm.1. A method for grinding old pot lining or the like, comprising a crushing operation, a screening operation making it possible to separate the grains having the dimensions of the finished product from the crushed product, and a grinding operation making it possible to reduce the products screening to the dimensions of the finished product, characterized in that the grinding is carried out in a vibrating cone mill whose reduction ratio is significantly greater than that of a conventional cone mill and in that the grain dimensions of the product finished do not exceed 2.5-3 mm.
2. Procédé selon la revendication 1, caractérisé en ce que les produits de l'opération de broyage sont également soumis à ladite opération de criblage. 2. Method according to claim 1, characterized in that the products of the grinding operation are also subjected to said screening operation.
3. Installation pour le broyage de vieilles brasques ou de produits similaires caractérisée en ce qu'elle comporte un concasseur (12, 12'), un crible (16) dont la dimension des mailles correspond à celle du produit fini, un broyeur vibrant à cône (14), des moyens (20, 22) pour transporter jusqu'au crible les produits sortant du concasseur et éventuellement ceux sortant du broyeur, et des moyens pour renvoyer les refus du crible (16) à l'entrée du broyeur (14). 3. Installation for grinding old pot lining or similar products characterized in that it comprises a crusher (12, 12 '), a screen (16) whose mesh size corresponds to that of the finished product, a vibrating crusher with cone (14), means (20, 22) for transporting the products leaving the crusher and possibly those leaving the crusher to the screen, and means for returning the rejects from the screen (16) to the inlet of the crusher (14 ).
4. Installation selon la revendication 3, caractérisée en ce que le concasseur est un concasseur à mâchoires (12) dont les mâchoires font entre elles un angle inférieur à 20° et de préférence égal à 16°.4. Installation according to claim 3, characterized in that the crusher is a jaw crusher (12) whose jaws form an angle between them less than 20 ° and preferably equal to 16 °.
5. Installation selon la revendication 3, caractérisée en ce que le concasseur est un broyeur autogène ou semi-autogène à sortie périphérique (12'). 5. Installation according to claim 3, characterized in that the crusher is an autogenous or semi-autogenous crusher with peripheral outlet (12 ').
6. Installation selon l'une quelconque des revendications 3 à 5, caractérisée en ce qu'elle comporte une trémie (32) qui alimente le broyeur (14) et le maintient constamment en charge. 6. Installation according to any one of claims 3 to 5, characterized in that it comprises a hopper (32) which feeds the crusher (14) and keeps it constantly in charge.
EP94928436A 1993-09-28 1994-09-27 Method and plant for grinding old brasques and similar products Expired - Lifetime EP0675762B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR9311492A FR2710554B1 (en) 1993-09-28 1993-09-28 Method and installation for grinding old pot lining and similar products.
FR9311492 1993-09-28
PCT/FR1994/001121 WO1995009052A1 (en) 1993-09-28 1994-09-27 Method and plant for grinding old brasques and similar products

Publications (2)

Publication Number Publication Date
EP0675762A1 true EP0675762A1 (en) 1995-10-11
EP0675762B1 EP0675762B1 (en) 1999-11-17

Family

ID=9451282

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Application Number Title Priority Date Filing Date
EP94928436A Expired - Lifetime EP0675762B1 (en) 1993-09-28 1994-09-27 Method and plant for grinding old brasques and similar products

Country Status (13)

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US (1) US5558279A (en)
EP (1) EP0675762B1 (en)
CN (1) CN1115172A (en)
AU (1) AU669823B2 (en)
BR (1) BR9405604A (en)
CA (1) CA2150367C (en)
DE (1) DE69421687T2 (en)
EG (1) EG20317A (en)
FI (1) FI952498A0 (en)
FR (1) FR2710554B1 (en)
NZ (1) NZ273974A (en)
WO (1) WO1995009052A1 (en)
ZA (1) ZA947539B (en)

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US6689092B2 (en) 2000-03-03 2004-02-10 Boehringer International Gmbh Needle-less injector of miniature type

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CA2640514A1 (en) * 2008-09-18 2010-03-18 Kyle Alan Bruggencate Method and apparatus for processing an ore feed
CN102553700A (en) * 2011-07-06 2012-07-11 洛阳宇航重工机械有限公司 Bucket production line device and method for crushing aluminum oxide crusting blocks
CN109127074B (en) * 2018-07-30 2021-06-15 平利县中皇野生艾科研工贸有限公司 Multistage crushing system, multistage moxa preparation technology and four-stage moxa crushing system
CN111111898B (en) * 2020-01-23 2022-04-12 廉博 Digestion and utilization technology process for directly feeding electrolytic shell surface block into purification system
US12042801B2 (en) * 2020-07-29 2024-07-23 Chester Arthur Clark Recycling waste refractory material
CN114733598A (en) * 2022-04-14 2022-07-12 安徽美岚智能装备制造有限公司 Copper sheathing type fine crushing type cone crusher

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US6689092B2 (en) 2000-03-03 2004-02-10 Boehringer International Gmbh Needle-less injector of miniature type

Also Published As

Publication number Publication date
EG20317A (en) 1998-10-31
DE69421687T2 (en) 2001-05-03
FR2710554B1 (en) 1995-12-01
FI952498A (en) 1995-05-23
FI952498A0 (en) 1995-05-23
US5558279A (en) 1996-09-24
ZA947539B (en) 1995-06-23
CN1115172A (en) 1996-01-17
EP0675762B1 (en) 1999-11-17
CA2150367A1 (en) 1995-04-06
NZ273974A (en) 1996-02-27
AU669823B2 (en) 1996-06-20
DE69421687D1 (en) 1999-12-23
WO1995009052A1 (en) 1995-04-06
AU7786594A (en) 1995-04-18
BR9405604A (en) 1999-09-08
FR2710554A1 (en) 1995-04-07
CA2150367C (en) 2000-02-01

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