EP1401583A1 - Method and device for fine grinding of mineral particles - Google Patents

Method and device for fine grinding of mineral particles

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Publication number
EP1401583A1
EP1401583A1 EP02760362A EP02760362A EP1401583A1 EP 1401583 A1 EP1401583 A1 EP 1401583A1 EP 02760362 A EP02760362 A EP 02760362A EP 02760362 A EP02760362 A EP 02760362A EP 1401583 A1 EP1401583 A1 EP 1401583A1
Authority
EP
European Patent Office
Prior art keywords
balls
fine grinding
particle size
mill
grinding method
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
EP02760362A
Other languages
German (de)
French (fr)
Other versions
EP1401583B1 (en
Inventor
Philippe Artru
Merien Ould Rouis
Edouard Landao
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.)
Winoa SA
Original Assignee
Wheelabrator Allevard 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 Wheelabrator Allevard SA filed Critical Wheelabrator Allevard SA
Publication of EP1401583A1 publication Critical patent/EP1401583A1/en
Application granted granted Critical
Publication of EP1401583B1 publication Critical patent/EP1401583B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B02—CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02C—CRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C17/00—Disintegrating by tumbling mills, i.e. mills having a container charged with the material to be disintegrated with or without special disintegrating members such as pebbles or balls
    • B02C17/18—Details
    • B02C17/20—Disintegrating members

Definitions

  • the invention relates to a process for the fine grinding of mineral particles by means of a grinder containing grinding bodies comprising steel or cast iron balls, having dimensions of between 20 mm and 120 mm.
  • the object of the invention is to develop a fine grinding process for mineral particles making it possible to obtain an optimum yield from the grinder with energy savings and an increase in productivity.
  • the method according to the invention is characterized by the following stages consisting in: - manufacturing by atomization of steel balls with high carbon content or of cast iron in a range of particle size remaining less than 15 mm, - and mixing the balls with the balls inside the mill according to a predetermined weight proportion depending on the particle size of the mineral particles to be ground, and the desired reduction ratio between the feed and the final product.
  • the proportion by weight of the balls in the mixture increases in the event of a reduction in the particle size distribution of the particles at the inlet, and conversely decreases in the event of an increase in said particle size distribution.
  • the steel or the cast iron balls have a carbon content of the order of 0.6% to 3.5%, and can be alloyed with Cr and / or Mo. According to another characteristic of the invention, the balls undergo, after atomization, a heat treatment for hardening to the core intended to reinforce the mechanical resistance and the resistance to corrosion.
  • FIG. 1 is a schematic view of the grinding circuit equipped with a primary mill upstream of a secondary mill for fine grinding of the particles;
  • FIG. 2 illustrate two diagrams of the reduction ratio of the particles of the product to be ground according to the weight proportion of the balls in the ground mixture.
  • the invention relates to the fine grinding of mineral particles, in particular of rocks, ores, concentrated sulphides or other minerals with a high metallic content, or even industrial minerals, having previously undergone a first reduction in size in a primary mill 10
  • the dimensions of the mineral particles obtained following this prior grinding are generally greater than 50 or 100 microns.
  • Subsequent fine grinding is then carried out in a secondary reciprocating mill 12 with recirculation (closed circuit) to reduce the particle size of the particles at the outlet 14. It is also possible to use a mill without recirculation (open circuit not shown) in Figure 1).
  • the primary crusher 10 of the autogenous type is associated with a screen 16 surmounted by a watering ramp 18 to separate the solid fragments of rock according to their size. The largest fragments are recycled in the primary mill 10, and the finest are sent to the secondary grinding circuit.
  • the base of the screen 16 is connected by a pipe 18 to a recovery tank 20, which is connected by a pump 22 to at least one cyclone separation device 24.
  • Cyclone 24 has an underflow 26 for recycling and an overflow 28 for evacuation of the finished product corresponding to fine grinding whose particle size is less than 100 microns.
  • a pipe 30 connects the underflow 26 to a hopper 32 for supplying the secondary mill 12 to ensure the recycling of excessively large particles.
  • the secondary crusher 12 with horizontal rotary drum 33 has an inlet 34 in connection with the hopper 32, and a longitudinal chamber 35 containing bodies or grinding media constituted by a mixture of balls 36 and balls 38 of steel.
  • the outlet 14 of the secondary crusher 12 is offset downward relative to the level of the inlet 34, and comprises a grid 40 disposed above the recovery tank 20.
  • the balls 36 and the balls 38 are distributed over the entire length of the chamber 35 while remaining stored by gravity at a filling level set back from the inlet 34 and the outlet 14, said level depending on the load factor.
  • the particles to be ground are injected into the chamber 35 in the axial direction indicated by the arrow F.
  • the balls 36 of the grinding charge are used in a conventional manner in grinders, and are generally made of steel or cast iron with sizes between 20 mm and 120 mm.
  • the shape of the balls 36 can be spherical or cylindrical with precise diameters.
  • liquid phase grinding system described above can also be replaced by dry grinding in open or closed circuit with recirculation.
  • the fluid is air.
  • the innovation consists in mixing the balls 38 of smaller sizes with the balls 36 to optimize the reduction ratio of the particles inside the secondary mill 12.
  • the balls 38 have spherical or slightly flattened shapes, with diameters less than 15 mm.
  • the chemical composition of the balls 38 can be that of steel or cast iron shot, with a carbon content of the order of 0.6% to 3.5%.
  • the steel or cast iron can be alloyed with Cr and / or Mo, or any other element capable of reinforcing the resistance to wear, to corrosion and to mechanical shocks occurring during grinding.
  • the steel or cast iron balls 38 are advantageously obtained by atomization with water or by centrifugation, with a range of variable particle sizes remaining less than 15 mm. After the atomization phase, the balls 38 undergo a selection of the shape, sorting by sizes, and then heat treatments to carry out core hardening intended to standardize the hardness at the periphery and in the center.
  • the minimum cooling rate in the mass of a ball 38 is preferably greater than 10 ° C / second.
  • the proportion by weight of the balls 38 in the mixture with the balls 36 depends on the particle size of the particles at the inlet 34 of the secondary mill 12. It will be all the greater the finer the particle size of the particles at the inlet. Conversely, in the event of an increase in the particle size of the particles of the product to be ground, it is necessary to reduce the proportion of the balls 38 relative to the balls 36. During the rotation of the grinding drum 33, the balls 38 attack the small particles , while the balls 36 take care of the larger particles. The grindability of the product to be ground can also influence the proportion of the balls 38.
  • the balls 38 and the balls 36 of the grinding bodies have a real density greater than 7.5.
  • the smallest balls 38 will occupy the interstices between the balls 36 so as to increase the apparent density of the load, and to release volume for the pulp 42.
  • the apparent density of the balls (38) must be greater than 4.
  • the diameter of the spherical balls (38) is preferably between 1 mm and 12 mm.
  • the pulp layer 42 exceeds the level of the grinding load, at a level substantially coplanar with the outlet 14, and below the inlet 34.
  • FIG. 2 shows two diagrams of the reduction ratio of the particles of the product to be ground as a function of the weight proportion of the balls 38 in the grinding mixture corresponding to two particle sizes of 160 microns and 370 microns of the particles, and at the same grinding time on the order of 30 minutes.
  • the reduction ratio of the particles is optimum (approximately 7.5) when the percentage of beads 38 in the mixture is 60%.
  • the reduction ratio increases linearly by 40% (from 5.3 to 7.5) for a percentage of beads 38 varying from 0 to 60%.
  • the reduction ratio of the particles is optimum (approximately 6.2) when the percentage of beads 38 in the mixture is 30%. It then decreases with a slight slope (up to 5.8) when the percentage of beads 38 varies from 30% to 60%.
  • the reduction ratio increases linearly by 16% (from 5.3 to 6.2) for a percentage of beads 38 varying from 0 to 30%.
  • the vertices A and B of the two curves correspond to the maximum degree of grinding of the grinder for predetermined particle sizes at the inlet.
  • the optimum final particle size at the outlet of the secondary mill 12 is then of the order of 20 microns following the reduction ratio of 7.5 for an inlet particle size of 160 microns, and 60 microns following the reduction ratio of 6 , 2 for an input particle size of 370 microns.

Landscapes

  • Engineering & Computer Science (AREA)
  • Food Science & Technology (AREA)
  • Crushing And Grinding (AREA)
  • Disintegrating Or Milling (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
  • Manufacture Of Metal Powder And Suspensions Thereof (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Crushing And Pulverization Processes (AREA)

Abstract

A method for fine grinding of mineral particles consists of producing by atomization pellets, made from steel with a high carbon content, or cast iron, with a granular size range less than 15 mm and mixing the pellets with balls, made from steel or cast iron with dimensions between 20 mm and 120 mm, in a rotating grinding mill, the proportion by weight of pellets depending on the granular size of the mineral particles for grinding and the desired reduction ratio.

Description

Procédé et dispositif de broyage fin de particules minérales.Process and device for fine grinding of mineral particles.
Domaine technique de l'inventionTechnical field of the invention
L'invention est relative à un procédé de broyage fin de particules minérales au moyen d'un broyeur renfermant des corps de broyage comprenant des boulets en acier ou en fonte, ayant des dimensions comprises entre 20 mm et 120 mm.The invention relates to a process for the fine grinding of mineral particles by means of a grinder containing grinding bodies comprising steel or cast iron balls, having dimensions of between 20 mm and 120 mm.
Etat de la techniqueState of the art
Il est classique d'utiliser des boulets de broyage dans des broyeurs rotatifs horizontaux pour réduire la granulométrie de particules minérales concassées préalablement. Les tailles de ces boulets à l'état neuf sont rarement inférieures à 22,5 mm. La résistance mécanique de ces boulets de grandes tailles reste néanmoins limitée à cause de la répartition radiale inégale de la dureté et de ta structure métallique obtenues lors des traitements thermiques. La dureté est souvent inférieure au centre, ce qui entraîne une usure accélérée et irrégulière des boulets. Un autre inconvénient est l'énergie importante nécessaire au broyeur pour obtenir une granulométrie prédéterminée à la sortie, et cela d'autant plus que cette granulométrie est fine.It is conventional to use grinding balls in horizontal rotary mills to reduce the particle size of previously crushed mineral particles. The sizes of these balls in new condition are rarely less than 22.5 mm. The mechanical resistance of these large-sized balls nevertheless remains limited because of the uneven radial distribution of the hardness and of the metallic structure obtained during the heat treatments. The hardness is often lower in the center, which leads to accelerated and irregular wear of the balls. Another drawback is the large energy required for the crusher to obtain a predetermined particle size at the outlet, and all the more so since this particle size is fine.
II est en effet déjà prouvé et décrit dans de nombreuses publications, que plus la granulométrie du produit d'entrée est fine, plus il est favorable de diminuer la taille des boulets pour obtenir une efficacité de broyage donnée avec le minimum d'énergie dépensée. Le facteur déterminant devient alors la surface des médias de broyage qui augmente à mesure que leurs tailles diminuent. Dans un broyeur rotatif, l'essentiel de l'énergie variable est celle qui est nécessaire pour mettre la charge des corps broyants en mouvement, alors que l'énergie d'entraînement en rotation du broyeur lui-même, est prédéterminée. En cas de diminution de la charge des corps broyants, on diminuera l'énergie nécessaire (à productivité égale). Cette diminution de la charge est possible avec un média de broyage de taille réduite, qui permet un broyage plus efficace, toutes choses égales par ailleurs.It is indeed already proven and described in numerous publications, that the finer the particle size of the input product, the more it is favorable to reduce the size of the balls to obtain a given grinding efficiency with the minimum energy expended. The determining factor then becomes the surface of the grinding media which increases as their sizes decrease. In a rotary mill, most of the variable energy is that which is necessary to set the load of the grinding bodies in motion, while the energy of rotation driving of the mill itself, is predetermined. In the event of a reduction in the load of the grinding bodies, the energy required will be reduced (for equal productivity). This reduction in load is possible with a reduced grinding medium, which allows more efficient grinding, all other things being equal.
Objet de l'inventionSubject of the invention
L'objet de l'invention consiste à élaborer un procédé de broyage fin de particules minérales permettant d'obtenir un rendement optimum du broyeur avec une économie d'énergie et une augmentation de la productivité.The object of the invention is to develop a fine grinding process for mineral particles making it possible to obtain an optimum yield from the grinder with energy savings and an increase in productivity.
Le procédé selon l'invention est caractérisé par les étapes suivantes consistant à : - fabriquer par atomisation des billes d'acier à haute teneur en carbone ou de fonte dans une gamme de granulométrie restant inférieure à 15 mm, - et mélanger les billes avec les boulets à l'intérieur du broyeur selon une proportion pondérale prédéterminée dépendant de la granulométrie des particules minérales à broyer, et du rapport de réduction souhaité entre l'alimentation et le produit final.The method according to the invention is characterized by the following stages consisting in: - manufacturing by atomization of steel balls with high carbon content or of cast iron in a range of particle size remaining less than 15 mm, - and mixing the balls with the balls inside the mill according to a predetermined weight proportion depending on the particle size of the mineral particles to be ground, and the desired reduction ratio between the feed and the final product.
Selon une caractéristique de l'invention, la proportion pondérale des billes dans le mélange augmente en cas de diminution de la granulométrie des particules à l'entrée, et inversement diminue en cas d'augmentation de ladite granulométrie.According to a characteristic of the invention, the proportion by weight of the balls in the mixture increases in the event of a reduction in the particle size distribution of the particles at the inlet, and conversely decreases in the event of an increase in said particle size distribution.
L'acier ou la fonte des billes possèdent une teneur en carbone de l'ordre de 0,6% à 3,5%, et peuvent être alliés avec du Cr et/ou du Mo. Selon une autre caractéristique de l'invention, les billes subissent après atomisation, un traitement thermique pour une trempé à cœur destinée à renforcer la résistance mécanique et la tenue à la corrosion.The steel or the cast iron balls have a carbon content of the order of 0.6% to 3.5%, and can be alloyed with Cr and / or Mo. According to another characteristic of the invention, the balls undergo, after atomization, a heat treatment for hardening to the core intended to reinforce the mechanical resistance and the resistance to corrosion.
Description sommaire des dessinsBrief description of the drawings
D'autres avantages et caractéristiques ressortiront plus clairement de la description qui va suivre d'un mode de réalisation de l'invention donné à titre d'exemple non limitatif, et représenté aux dessins annexés, dans lesquels:Other advantages and characteristics will emerge more clearly from the description which follows of an embodiment of the invention given by way of nonlimiting example, and represented in the appended drawings, in which:
la figure 1 est une vue schématique du circuit de broyage équipé d'un broyeur primaire en amont d'un broyeur secondaire pour le broyage fin des particules ; la figure 2 illustrent deux diagrammes du rapport de réduction des particules du produit à broyer en fonction de la proportion pondérale des billes dans le mélange de broyage.Figure 1 is a schematic view of the grinding circuit equipped with a primary mill upstream of a secondary mill for fine grinding of the particles; FIG. 2 illustrate two diagrams of the reduction ratio of the particles of the product to be ground according to the weight proportion of the balls in the ground mixture.
Description d'un mode de réalisation préférentiel.Description of a preferred embodiment.
L'invention concerne le broyage fin de particules minérales, notamment de roches, de minerais, de concentré de sulfures ou autres minéraux à forte teneur métallique, ou encore de minéraux industriels, ayant subi au préalable une première réduction de tailles dans un broyeur primaire 10. Les dimensions des particules minérales obtenues à la suite de ce broyage préalable sont généralement supérieures à 50 ou 100 microns. Le broyage fin ultérieur est opéré par la suite dans un broyeur secondaire 12 rotatif à recirculation (circuit fermé) pour réduire la granulométrie des particules à la sortie 14. Il est également possible de faire usage d'un broyeur sans recirculation (circuit ouvert non représenté à la figure 1).The invention relates to the fine grinding of mineral particles, in particular of rocks, ores, concentrated sulphides or other minerals with a high metallic content, or even industrial minerals, having previously undergone a first reduction in size in a primary mill 10 The dimensions of the mineral particles obtained following this prior grinding are generally greater than 50 or 100 microns. Subsequent fine grinding is then carried out in a secondary reciprocating mill 12 with recirculation (closed circuit) to reduce the particle size of the particles at the outlet 14. It is also possible to use a mill without recirculation (open circuit not shown) in Figure 1).
Le broyeur primaire 10 du type autogène est associé à un crible 16 surmonté d'une rampe d'arrosage 18 pour séparer selon leur grosseur les fragments solides de roches. Les plus gros fragments sont recyclés dans le broyeur primaire 10, et les plus fins sont envoyés dans le circuit de broyage secondaire. La base du crible 16 est reliée par une conduite 18 à un bac de récupération 20, lequel est branché par une pompe 22 à au moins un dispositif de séparation à cyclone 24.The primary crusher 10 of the autogenous type is associated with a screen 16 surmounted by a watering ramp 18 to separate the solid fragments of rock according to their size. The largest fragments are recycled in the primary mill 10, and the finest are sent to the secondary grinding circuit. The base of the screen 16 is connected by a pipe 18 to a recovery tank 20, which is connected by a pump 22 to at least one cyclone separation device 24.
Le cyclone 24 comporte une sous-verse 26 de recyclage et une sur-verse 28 d'évacuation pour le produit fini correspondant à un broyage fin dont la granulométrie est inférieure à 100 microns. Une canalisation 30 relie la sous-verse 26 à une trémie 32 d'alimentation du broyeur secondaire 12 pour assurer le recyclage des particules trop grosses.Cyclone 24 has an underflow 26 for recycling and an overflow 28 for evacuation of the finished product corresponding to fine grinding whose particle size is less than 100 microns. A pipe 30 connects the underflow 26 to a hopper 32 for supplying the secondary mill 12 to ensure the recycling of excessively large particles.
Le broyeur secondaire 12 à tambour 33 horizontal rotatif, comporte une entrée 34 en liaison avec la trémie 32, et une chambre 35 longitudinale renfermant des corps ou médias de broyage constitués par un mélange de boulets 36 et de billes 38 en acier. La sortie 14 du broyeur secondaire 12 est décalée vers le bas par rapport au niveau de l'entrée 34, et comprend une grille 40 disposée au-dessus du bac de récupération 20.The secondary crusher 12 with horizontal rotary drum 33, has an inlet 34 in connection with the hopper 32, and a longitudinal chamber 35 containing bodies or grinding media constituted by a mixture of balls 36 and balls 38 of steel. The outlet 14 of the secondary crusher 12 is offset downward relative to the level of the inlet 34, and comprises a grid 40 disposed above the recovery tank 20.
A l'intérieur du tambour 33, les boulets 36 et les billes 38 sont répartis sur toute la longueur de la chambre 35 en restant stockés par gravité à un niveau de remplissage en retrait par rapport à l'entrée 34 et la sortie 14, ledit niveau dépendant du coefficient de remplissage de la charge. Les particules à broyer sont injectées dans la chambre 35 dans le sens axial indiqué par la flèche F.Inside the drum 33, the balls 36 and the balls 38 are distributed over the entire length of the chamber 35 while remaining stored by gravity at a filling level set back from the inlet 34 and the outlet 14, said level depending on the load factor. The particles to be ground are injected into the chamber 35 in the axial direction indicated by the arrow F.
Les boulets 36 de la charge de broyage sont utilisés d'une manière classique dans les broyeurs, et sont généralement en acier ou en fonte avec des tailles comprises entre 20 mm et 120 mm. La forme des boulets 36 peut être sphérique ou cylindrique avec des diamètres précis.The balls 36 of the grinding charge are used in a conventional manner in grinders, and are generally made of steel or cast iron with sizes between 20 mm and 120 mm. The shape of the balls 36 can be spherical or cylindrical with precise diameters.
Le système de broyage en phase liquide décrit précédemment peut également être remplacé par un broyage à sec en circuit ouvert ou fermé avec recirculation.The liquid phase grinding system described above can also be replaced by dry grinding in open or closed circuit with recirculation.
Dans ce cas, le fluide est de l'air. Un tel dispositif est particulièrement adapté au broyage de ciment. L'innovation consiste à mélanger les billes 38 de tailles inférieures avec les boulets 36 pour optimiser le rapport de réduction des particules à l'intérieur du broyeur secondaire 12.In this case, the fluid is air. Such a device is particularly suitable for grinding cement. The innovation consists in mixing the balls 38 of smaller sizes with the balls 36 to optimize the reduction ratio of the particles inside the secondary mill 12.
Les billes 38 présentent des formes sphériques ou légèrement aplaties, avec des diamètres inférieurs à 15 mm. La composition chimique des billes 38 peut être celle de la grenaille d'acier ou de fonte, avec une teneur en carbone de l'ordre de 0,6% à 3,5%. L'acier ou la fonte peuvent être alliés avec du Cr et/ou du Mo, ou tout autre élément susceptible de renforcer la résistance à l'usure, à la corrosion et aux chocs mécaniques intervenant lors du broyage.The balls 38 have spherical or slightly flattened shapes, with diameters less than 15 mm. The chemical composition of the balls 38 can be that of steel or cast iron shot, with a carbon content of the order of 0.6% to 3.5%. The steel or cast iron can be alloyed with Cr and / or Mo, or any other element capable of reinforcing the resistance to wear, to corrosion and to mechanical shocks occurring during grinding.
Les billes 38 d'acier ou de fonte sont obtenues avantageusement par atomisation à l'eau ou par centrifugation, avec une gamme de granulométries variables restant inférieures à 15 mm. Après la phase d'atomisation, les billes 38 subissent une sélection de la forme, un tri par tailles, et ensuite des traitements thermiques pour réaliser des trempes à cœur destinées à uniformiser la dureté à la périphérie et au centre.The steel or cast iron balls 38 are advantageously obtained by atomization with water or by centrifugation, with a range of variable particle sizes remaining less than 15 mm. After the atomization phase, the balls 38 undergo a selection of the shape, sorting by sizes, and then heat treatments to carry out core hardening intended to standardize the hardness at the periphery and in the center.
Lors de la phase d'atomisation, la vitesse de refroidissement minimum dans la masse d'une bille 38 est de préférence supérieure à 10°C/seconde.During the atomization phase, the minimum cooling rate in the mass of a ball 38 is preferably greater than 10 ° C / second.
La proportion en poids des billes 38 dans le mélange avec les boulets 36 dépend de la granulométrie des particules à l'entrée 34 du broyeur secondaire 12. Elle sera d'autant plus grande que la granulométrie des particules à l'entrée est fine. Inversement, en cas d'augmentation de la granulométrie des particules du produit à broyer, il est nécessaire de diminuer la proportion des billes 38 par rapport aux boulets 36. Lors de la rotation du tambour 33 de broyage, les billes 38 attaquent les petites particules, alors que les boulets 36 se chargent des plus grosses particules. La broyabilité du produit à broyer peut également influer sur la proportion des billes 38.The proportion by weight of the balls 38 in the mixture with the balls 36 depends on the particle size of the particles at the inlet 34 of the secondary mill 12. It will be all the greater the finer the particle size of the particles at the inlet. Conversely, in the event of an increase in the particle size of the particles of the product to be ground, it is necessary to reduce the proportion of the balls 38 relative to the balls 36. During the rotation of the grinding drum 33, the balls 38 attack the small particles , while the balls 36 take care of the larger particles. The grindability of the product to be ground can also influence the proportion of the balls 38.
Les billes 38 et les boulets 36 des corps broyants possèdent une densité réelle supérieure à 7,5. Les plus petites billes 38 vont occuper les interstices entre les boulets 36 de manière à augmenter la densité apparente de la charge, et à libérer du volume pour la pulpe 42. La densité apparente des billes (38) doit être supérieure à 4. Le diamètre des billes (38) spheriques est de préférence compris entre 1 mm et 12 mm.The balls 38 and the balls 36 of the grinding bodies have a real density greater than 7.5. The smallest balls 38 will occupy the interstices between the balls 36 so as to increase the apparent density of the load, and to release volume for the pulp 42. The apparent density of the balls (38) must be greater than 4. The diameter of the spherical balls (38) is preferably between 1 mm and 12 mm.
Lors du broyage, la couche de pulpe 42 dépasse le niveau de la charge de broyage, à un niveau sensiblement coplanaire avec la sortie 14, et en-dessous de l'entrée 34.During grinding, the pulp layer 42 exceeds the level of the grinding load, at a level substantially coplanar with the outlet 14, and below the inlet 34.
La figure 2 montre deux diagrammes du rapport de réduction des particules du produit à broyer en fonction de la proportion pondérale des billes 38 dans le mélange de broyage correspondant à deux granulométries de 160 microns et 370 microns des particules, et à un même temps de broyage de l'ordre de 30 minutes.FIG. 2 shows two diagrams of the reduction ratio of the particles of the product to be ground as a function of the weight proportion of the balls 38 in the grinding mixture corresponding to two particle sizes of 160 microns and 370 microns of the particles, and at the same grinding time on the order of 30 minutes.
Pour la courbe F80 de 160 microns de granulométrie, le rapport de réduction des particules est optimum (environ 7,5) lorsque le pourcentage de billes 38 dans le mélange est de 60%. Le rapport de réduction croît linéairement de 40% (de 5,3 à 7,5) pour un pourcentage de billes 38 variant de 0 à 60%.For the 160 micron particle size curve F80, the reduction ratio of the particles is optimum (approximately 7.5) when the percentage of beads 38 in the mixture is 60%. The reduction ratio increases linearly by 40% (from 5.3 to 7.5) for a percentage of beads 38 varying from 0 to 60%.
Pour la courbe F80 de 370 microns de granulométrie, le rapport de réduction des particules est optimum (environ 6,2) lorsque le pourcentage de billes 38 dans le mélange est de 30%. Il décroît ensuite avec une faible pente (jusqu'à 5,8) lorsque le pourcentage de billes 38 varie de 30% à 60%. Le rapport de réduction croît linéairement de 16% (de 5,3 à 6,2) pour un pourcentage de billes 38 variant de 0 à 30%.For the F80 curve of 370 microns in particle size, the reduction ratio of the particles is optimum (approximately 6.2) when the percentage of beads 38 in the mixture is 30%. It then decreases with a slight slope (up to 5.8) when the percentage of beads 38 varies from 30% to 60%. The reduction ratio increases linearly by 16% (from 5.3 to 6.2) for a percentage of beads 38 varying from 0 to 30%.
Les sommets A et B des deux courbes correspondent au degré de broyage maximum du broyeur pour des granulométries prédéterminées à l'entrée. La granulométrie finale optimum à la sortie du broyeur secondaire 12 est alors de l'ordre de 20 microns suite au rapport de réduction de 7,5 pour une granulométrie d'entrée de 160 microns, et de 60 microns suite au rapport de réduction de 6,2 pour une granulométrie d'entrée de 370 microns.The vertices A and B of the two curves correspond to the maximum degree of grinding of the grinder for predetermined particle sizes at the inlet. The optimum final particle size at the outlet of the secondary mill 12 is then of the order of 20 microns following the reduction ratio of 7.5 for an inlet particle size of 160 microns, and 60 microns following the reduction ratio of 6 , 2 for an input particle size of 370 microns.
Il est bien entendu possible de choisir le pourcentage de billes 38 de 10% à 80% en fonction de la granulométrie finale souhaitée. Les avantages qui en découlent pour un même produit à broyer (nature et granulométrie) à l'entrée du broyeur 12, sont les suivants :It is of course possible to choose the percentage of beads 38 from 10% to 80% depending on the final particle size desired. The advantages which result from this for the same product to be ground (nature and grain size) at the inlet of the mill 12, are the following:
- économie d'énergie de l'ordre de 10% à 20% pour un broyeur rotatif horizontal, et 30% à 300% pour un broyeur rotatif vertical, notamment du type Vertimill, à flux égal de matière solide traversant le broyeur ;- energy saving of the order of 10% to 20% for a horizontal rotary mill, and 30% to 300% for a vertical rotary mill, in particular of the Vertimill type, with equal flow of solid matter passing through the mill;
- augmentation de la productivité pouvant atteindre 30% à énergie égale et à finesse égale du produit broyé à la sortie ;- increase in productivity of up to 30% at equal energy and at the same fineness of the product ground at the outlet;
- amélioration de la finesse du produit broyé à énergie égale et à débit égal.- improvement of the fineness of the product ground at equal energy and at equal rate.
Lors de la rotation du broyeur 12 horizontal de la figure 1 , on a noté que les billes 38 ne s'échappent pas à travers la grille 40, et restent stockées par gravité à l'intérieur de la chambre 35 en se plaçant sous les boulets 36 de manière à former une couche inférieure d'épaisseur progressive le long de la direction longitudinale. Au cours du broyage, la plupart des billes 38 s'accumulent du côté de la sortie 14, sans dépasser le niveau de la couche de pulpe 42. Les billes 38 restent néanmoins protégées par une couche de boulets 36. During the rotation of the horizontal grinder 12 of FIG. 1, it has been noted that the balls 38 do not escape through the grid 40, and remain stored by gravity inside the chamber 35 by placing themselves under the balls 36 so as to form a lower layer of progressive thickness along the longitudinal direction. During grinding, most of the balls 38 accumulate on the side of the outlet 14, without exceeding the level of the pulp layer 42. The balls 38 nevertheless remain protected by a layer of balls 36.

Claims

Revendications claims
1. Procédé de broyage fin de particules minérales au moyen d'un broyeur (12) rotatif renfermant des corps de broyage comprenant des boulets (36) en acier ou en fonte ayant des dimensions comprises entre 20 mm et 120 mm, o caractérisé par les étapes suivantes consistant à :1. Method of fine grinding of mineral particles by means of a rotary grinder (12) containing grinding bodies comprising balls (36) of steel or cast iron having dimensions between 20 mm and 120 mm, o characterized by following steps consisting of:
- fabriquer par atomisation des billes (38) d'acier à haute teneur en carbone, ou de fonte dans une gamme de granulométrie restant inférieure à 15 mm,- manufacturing by atomization of balls (38) of steel with high carbon content, or of cast iron in a range of particle size remaining less than 15 mm,
- et mélanger les billes (38) avec les boulets (36) à l'intérieur du broyeur (12) selon une proportion pondérale prédéterminée dépendant de la granulométrie des 5 particules minérales à broyer, et du rapport de réduction souhaité.- And mix the balls (38) with the balls (36) inside the mill (12) according to a predetermined weight proportion depending on the particle size of the 5 mineral particles to be ground, and the desired reduction ratio.
2. Procédé de broyage fin selon la revendication 1 , caractérisé en ce que la proportion pondérale des billes (38) dans le mélange augmente en cas de 0 diminution de la granulométrie des particules à l'entrée, et inversement diminue en cas d'augmentation de ladite granulométrie.2. A fine grinding method according to claim 1, characterized in that the proportion by weight of the balls (38) in the mixture increases in the event of a reduction in the particle size distribution at the inlet, and conversely decreases in the event of an increase of said particle size.
3. Procédé de broyage fin selon la revendication 1 ou 2, caractérisé en ce que la 5 teneur en carbone des billes (38) est de l'ordre de 0,6% à 3,5%.3. A fine grinding process according to claim 1 or 2, characterized in that the carbon content of the balls (38) is of the order of 0.6% to 3.5%.
4. Procédé de broyage fin selon la revendication 3, caractérisé en ce que l'acier ou la fonte des billes (38) peut être allié avec du Cr et/ou du Mo. 0 4. A fine grinding process according to claim 3, characterized in that the steel or the cast iron of the balls (38) can be alloyed with Cr and / or Mo. 0
5. Procédé de broyage fin selon la revendication 3 ou 4, caractérisé en ce que les billes (38) subissent après atomisation, un traitement thermique pour une trempe à cœur.5. A fine grinding method according to claim 3 or 4, characterized in that the balls (38) undergo, after atomization, a heat treatment for quenching at heart.
6. Procédé de broyage fin selon la revendication 1 , caractérisé en ce que le diamètre des billes (38) spheriques est de préférence compris entre 1 mm et 12 mm.6. A fine grinding method according to claim 1, characterized in that the diameter of the spherical balls (38) is preferably between 1 mm and 12 mm.
7. Procédé de broyage fin selon l'une des revendications 1 à 6, caractérisé en ce que les particules minérales à broyer présentent à l'entrée (34) du broyeur secondaire (12), une granulométrie supérieure à 50 microns, laquelle est obtenue après une première réduction de tailles dans un broyeur primaire (10).7. A fine grinding method according to one of claims 1 to 6, characterized in that the mineral particles to be ground have at the inlet (34) of the secondary mill (12), a particle size greater than 50 microns, which is obtained after a first reduction in size in a primary mill (10).
8. Procédé de broyage fin selon l'une des revendications 1 à 7, caractérisé en ce que le broyage intervient dans un broyeur horizontal ou vertical.8. A fine grinding method according to one of claims 1 to 7, characterized in that the grinding takes place in a horizontal or vertical mill.
9. Procédé de broyage fin selon l'une des revendications 1 à 7, caractérisé en ce que les billes (38) et les boulets (36) des corps broyants possèdent une densité réelle supérieure à 7,5.9. A fine grinding method according to one of claims 1 to 7, characterized in that the balls (38) and the balls (36) of the grinding bodies have a real density greater than 7.5.
10. Procédé de broyage fin selon l'une des revendications 1 à 7, caractérisé en ce que la densité apparente des billes (38) doit être supérieure à 4.10. A fine grinding method according to one of claims 1 to 7, characterized in that the apparent density of the balls (38) must be greater than 4.
11. Procédé de broyage fin selon l'une des revendications 1 à 10, caractérisé en ce que lors de la phase d'atomisation des billes (38), la vitesse de refroidissement minimum dans la masse est de préférence supérieure à 10°C/seconde. 11. A fine grinding method according to one of claims 1 to 10, characterized in that during the atomization phase of the balls (38), the minimum cooling rate in the mass is preferably greater than 10 ° C / second.
EP02760362A 2001-06-25 2002-06-25 Method and device for fine grinding of mineral particles Expired - Lifetime EP1401583B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
FR0108350 2001-06-25
FR0108350A FR2826299B1 (en) 2001-06-25 2001-06-25 METHOD AND DEVICE FOR FINE GRINDING OF MINERAL PARTICLES
PCT/FR2002/002197 WO2003000427A1 (en) 2001-06-25 2002-06-25 Method and device for fine grinding of mineral particles

Publications (2)

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EP1401583A1 true EP1401583A1 (en) 2004-03-31
EP1401583B1 EP1401583B1 (en) 2006-03-15

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EP (1) EP1401583B1 (en)
JP (1) JP4156510B2 (en)
AT (1) ATE320313T1 (en)
BR (1) BR0210639B1 (en)
CA (1) CA2450190C (en)
DE (1) DE60209921T2 (en)
ES (1) ES2260473T3 (en)
FR (1) FR2826299B1 (en)
MX (1) MXPA03011233A (en)
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JP5896270B2 (en) * 2011-09-16 2016-03-30 新東工業株式会社 Grinding media, grinding method using the grinding media, and manufacturing method of the grinding media
CN103736570B (en) * 2013-12-13 2015-10-21 郭斐 The granule modified processing technology of iron sand, iron sand particle and crusher plate
US9943853B2 (en) * 2014-01-16 2018-04-17 Michael Marshall Pulverizing apparatus and method of pulverizing rocks
CN106391221A (en) * 2016-11-18 2017-02-15 福州恒裕陶瓷有限公司 Ball mill for grinding ceramic glaze
CN109569809A (en) * 2018-11-13 2019-04-05 北京国电龙源环保工程有限公司 A kind of desulfurization based on big data grinds system steel ball method of adjustment and system
CN113731299B (en) * 2021-08-30 2022-10-18 安徽亚格盛电子新材料有限公司 Particle size control process of trimethyl indium
CN114471845B (en) * 2022-02-15 2023-02-10 福建长泰万泰矿物制品有限公司 Silica grinding method

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FR2826299A1 (en) 2002-12-27
DE60209921D1 (en) 2006-05-11
ATE320313T1 (en) 2006-04-15
FR2826299B1 (en) 2003-09-26
JP2004530551A (en) 2004-10-07
JP4156510B2 (en) 2008-09-24
MXPA03011233A (en) 2004-10-28
CA2450190C (en) 2009-09-29
DE60209921T2 (en) 2006-12-14
EP1401583B1 (en) 2006-03-15
ZA200309746B (en) 2004-05-24
BR0210639A (en) 2004-07-27
ES2260473T3 (en) 2006-11-01
BR0210639B1 (en) 2011-01-11
WO2003000427A1 (en) 2003-01-03
US20040118954A1 (en) 2004-06-24
CA2450190A1 (en) 2003-01-03
US7093782B2 (en) 2006-08-22

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