EP1317969B1 - Method and device for treating mineral materials such as soil or recycled material - Google Patents

Method and device for treating mineral materials such as soil or recycled material Download PDF

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Publication number
EP1317969B1
EP1317969B1 EP20020292984 EP02292984A EP1317969B1 EP 1317969 B1 EP1317969 B1 EP 1317969B1 EP 20020292984 EP20020292984 EP 20020292984 EP 02292984 A EP02292984 A EP 02292984A EP 1317969 B1 EP1317969 B1 EP 1317969B1
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EP
European Patent Office
Prior art keywords
screen
section
materials
transporter
mineral materials
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EP20020292984
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German (de)
French (fr)
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EP1317969A1 (en
Inventor
Richard Antoine Blaszczyk
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Auxiliaire-Entreprises
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Auxiliaire-Entreprises
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/005—Transportable screening plants
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/12—Apparatus having only parallel elements
    • B07B1/14—Roller screens
    • B07B1/15—Roller screens using corrugated, grooved or ribbed rollers
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C21/00—Apparatus or processes for surface soil stabilisation for road building or like purposes, e.g. mixing local aggregate with binder

Definitions

  • the invention relates to a device and a method for treating mineral materials such as soil or recovery materials.
  • Such materials must generally be the subject, in a first processing step, of a sorting operation and grading classification.
  • Such sorting and particle size classification operations are generally necessary when it is desired to carry out the treatment of land with or without liming, the supply to a commercial network of materials in a suitable granulometric form or the physical stabilization of these materials with a view to their storage.
  • Pre-sorting and material treatment machines are known as envisaged above which comprise in particular a receiving hopper for mineral materials, an extractor of mineral materials contained in the hopper, from below the hopper, a sieve fed with mineral materials by the extractor and at least one material carrier separated by the screen disposed below the screen.
  • the conveyor is preferably a weighing conveyor on which it is possible to incorporate certain additives into the material on which sorting has been carried out.
  • This first carrier can realize the feeding of a installation such as a mixer or a second material recovery conveyor at the exit of the installation.
  • the refusals reaching the exit end of the screen can be evacuated by a third conveyor which feeds for example a crushing plant.
  • Such a known installation is satisfactory, when it is desired to recover or process a homogeneous particle size material, that is to say a material whose particle size is in the same size range whose screen ensures selection.
  • a homogeneous particle size material that is to say a material whose particle size is in the same size range whose screen ensures selection.
  • it is desired to carry out the recovery or the treatment of a material comprising at least two granulometric fractions that is to say of a material consisting of at least a first fraction in a first granulometric slice and a second fraction in a second granulometric slice
  • the pre-sorting and processing plant must therefore be supplemented by additional devices that can be complex and expensive and whose integration into the installation can be difficult.
  • a device for treating mineral materials such as earth or recovery materials comprising a receiving hopper of mineral materials, a extractor of mineral materials contained in the hopper, from below the hopper, at least one screen supplied with mineral materials by the extractor and at least one first carrier of mineral materials separated by the screen, arranged below a part at least one sieve, in a longitudinal direction of the treatment device, this device for treating materials consisting of at least two different size fractions.
  • this device for treating materials consisting of at least two different size fractions.
  • the use of a first conveyor and a second conveyor can optionally unload the first particle size fraction on a pile outside the installation which reduces the number of possible operations.
  • the screen comprises a first separation section of a first size fraction of mineral materials disposed above the first conveyor and at least a second section of separation of a second size fraction of inorganic materials arranged following the first section, in the longitudinal direction of the device, and at least one second conveyor having one end placed above the first conveyor is arranged, in the longitudinal direction, below the second section of the screen, said second conveyor being a conveyor having displacement control means in any of two opposite directions of movement in the longitudinal direction of the treatment device
  • the invention also relates to a method as described in claim 14.
  • Figure 1 there is shown an installation for performing a sorting operation and a treatment on a crude mineral material to obtain a product from two size fractions of the raw material of starting which is made classification.
  • the installation 1 comprises a platform 2 which is provided with support feet 4 on the floor of the building site 1, in the service position of the installation 1, the platform 2 which supports all the components of the installation being in a horizontal arrangement.
  • the components of the installation 1 carried by the platform 2 comprise a loading hopper 5 into which are dumped the mineral materials such as earth or cuttings whose installation ensures sorting and processing.
  • a grid 6 which extends over the entire section of the hopper 5, in a horizontal plane, in its operating position and which can be raised by a control device to rotate the gate 6 by an angle greater than 90 °, as shown in Figure 3.
  • the tilting of the gate beyond the vertical position allows to unlock and fall outside the hopper, blocks of an excessive size that could be wedged between the bars 7 of the grid 6.
  • the bars 7 are mounted articulated to one of their ends along one of the longitudinal edges of the grid, so as to be pivotable to a vertical position, as shown in Figure 3, to ensure the release and the fall of the blocks stuck in the grid 6.
  • the hydraulic tilting means of the gate 6 can be controlled advantageously remotely, by a remote control of the radio or infrared type.
  • an extractor 8 consisting of a conveyor having horizontal rollers and a conveyor belt driven by pulleys in a longitudinal direction of the plant 1, in the direction of the arrow 9, of in order to convey the materials contained in the loading hopper 5 to a first end portion of a screening installation 10 extending in the longitudinal direction of the installation 1, following the loading hopper 5, towards the front of the installation (right part in Figure 1 and Figure 2).
  • the longitudinal direction of the installation 1 is represented in FIG. 1 by the longitudinal axis 11 common to the loading hopper 5, to the extractor 8 and to the screening installation 10.
  • the screening plant 10 comprises, from its first end located below and at the end of the outlet end of the extractor 8, in the longitudinal direction 11, a first section of screen 10a and, at following the first section of screen 10a, a second section of screen 10b extending from the second end of the first section 10a to the second end of the screening plant 10 or output end of the screening plant.
  • the extractor 8 is variable speed so that its flow rate can be adapted to the type of materials to be sorted contained in the loading hopper 5.
  • variable speed of the extractor 8 can be obtained by hydraulic or mechanical means, for example a drive belt or roller, or by electromechanical means frequency variation or DC.
  • the first and the second screen sections 10a and 10b of the screening plant 10 may be constituted by two successive sections of a screen made according to a known construction technique, for example two successive sections of a star screen or a screen. a disc screen.
  • a star screen comprises a plurality of transverse direction shafts perpendicular to the longitudinal direction of circulation of the products in the screen placed one after the other in the longitudinal direction on which are mounted rotating parts in the shape of a star. stars having elastic branches, the rotating parts carried by two successive shafts being offset relative to each other in the transverse direction of the screening installation.
  • Such star screens are proposed, for example, by the German company BACKERS MASCHINENBAU, and the Canadian company ERIN SYSTEMS.
  • first section 10a and the second section of screen 10b are constituted in the form of two successive sections of a star screen
  • the shafts carrying the star rotating parts in the two successive sections of the screening plant are driven separately at different speeds from each other so as to separate raw materials, successively, first and second size fractions.
  • variable speed and adjustable speed drive of the star screen shafts can be achieved by means of a hydraulic, mechanical or electromechanical drive with frequency variation or direct current.
  • a disk screen has a plurality of mutually transverse parallel shafts carrying metal disks, for example of polygonal shape, the corners of which are lined with anti-wear pads, spaced from one another in the transverse direction, the shafts of the cross-directional screen carrying the disks being arranged successively in the longitudinal direction of the screen, that is to say in the direction of circulation of the products to be screened and the disks of two successive shafts in the longitudinal direction are shifted. relative to each other in the transverse direction. Granulometric sorting of materials passing through the screen can be adjusted by adjusting the gap of the discs in the transverse direction.
  • Such a disk screen is proposed, for example, by the German company KRONENBERGER GmbH.
  • the discs carried by the trees in each of the successive sections of the screening plant are arranged with a spacing, in the transverse direction, adapted to the granulometric fraction which is to be separated in the sieve section.
  • the discs fixed on successive rotary shafts have a first spacing distance and, in the second section of screen 10b, the discs fixed on the successive rotary shafts have a second spacing distance.
  • the fraction of separated material corresponding to a desired particle size fraction is recovered below the screen, the materials flowing by gravity between the star rotating elements or the disks. sieve.
  • first screen section 10a of the screening plant 10 of the device according to the invention in the form of a star screen and the second screen 10b in the form of a disc screen or conversely, the first screen 10a in the form of a disc screen and the second screen 10b in the form of a star screen.
  • the adjustment characteristics of the star screen and discs are determined so as to separate the desired particle size fractions of the mineral materials passing on the screen.
  • a first conveyor 12 is disposed below the first screen 10a of the screening plant 10, along its entire length and below a portion of the screen. the extractor 8.
  • the first conveyor 12 of continuous type extends and ensures a flow of materials, in the longitudinal direction, so as to continuously recover the particle size fraction flowing by gravity below the first screen 10a of the screening apparatus 10 and transporting it in the longitudinal direction towards the rear of the device 1.
  • a discharge hopper 13 may be placed below the first screen 10a of the screening plant 10, so as to direct the particle size fraction separated by the screen 10a to the upper surface of the first conveyor belt 12.
  • the outlet end portion or rear portion of the first conveyor 12 is disposed above a input end of a recovery conveyor 14 ensuring the recovery of the materials discharged at the outlet of the first conveyor 12, the mixing of materials and the feed of a mixer 15.
  • a second conveyor 16 is placed below and in line with the second screen 10b or second section of the screening plant 10, so that the materials corresponding to the second size fraction separated from the Raw materials from the first section of screen 10a by the second screen 10b are poured, preferably via a chute 17, on the upper surface of the carpet of the second conveyor 16 which ensures their recovery continuously.
  • the second conveyor 16 has two directions of circulation, in the longitudinal direction 11 of the installation according to the invention, as represented by the double arrow 18 in FIG.
  • the fraction of material separated by the screen having a second particle size is poured onto the upper surface of the first conveyor 12, generally made in the form of a weighing conveyor.
  • the materials consisting of the first size fraction flowing from the first screen 10a on the carpet of the first conveyor 12 and the second size fraction of the materials from the second screen 10b discharged on the first conveyor by the second conveyor 16 are continuously discharged.
  • the recovery conveyor 14 which is in the form of a conveyor having a mixer feeding belt which allows a substantially homogeneous mixture of the two particle size fractions of the materials before discharging the mixture of materials in the mixer 15.
  • the materials of the second size fraction separated by the second screen 10b are discharged. at the outlet end of the second conveyor 16, for example to be discarded or to be transferred to a crusher for performing a grain size adjustment and homogenization of the second material fraction separated by the second screen 10b.
  • the crushed materials whose particle size has been homogenized can be reintroduced into the installation, via a carrier to be dumped, for example on the first conveyor 12, and then transported with the first fraction of the granulometric fraction. materials to the recovery conveyor 14 which ensures their mixing. These crushed and homogenized materials as to their grain size can also be discharged directly onto the recovery conveyor 14.
  • the second conveyor 16 may advantageously be in the form of a variable speed conveyor whose speed can be controlled to regulate the flow rate of the transported materials.
  • the installation 1 furthermore comprises a conveyor 20 for evacuating the refusals of the screening installation 10, a first end of which, or an inlet end, is disposed vertically and vertically. below the output end of the screening plant 10, at the output end of the second section of screen 10b.
  • the refusals carried by the evacuation conveyor 20 at the front end of the plant 1 can be evacuated and removed or transferred to a crusher so that their particle size is adjusted and homogenized. These crushed and homogenized materials can be reintroduced into the installation, via the first conveyor 12, the second conveyor 16 or the recovery conveyor 14.
  • the mixer 15 may be an arm mixer and pallets with two parallel shafts or a single shaft, depending on the flow of materials introduced into the mixer.
  • the mixer 15 can also be a mixer with disks and articulated arms.
  • the type of mixer is adapted to the materials introduced for their treatment in the mixer.
  • the mixer 15 can be made to be able to be inclined in the transverse direction of the installation, towards the output of the mixer. It is thus possible to adapt the mixer to the cohesive characteristics of the mixtures made in the mixer.
  • the mixer comprises, beneath the rotary shafts 15a and 15b carrying the mixing members of the kneader, a bottom which is preferably movable in the vertical direction, by means of hydraulic or mechanical holding jacks, and hinged about an axis. longitudinal direction to be tilted so that the unblocking and unclogging of the mixer, if necessary.
  • the installation 1 according to the invention comprises means for correcting the particle size or improving the physical characteristics of the product to be manufactured.
  • the installation 1 may comprise, as shown in particular in Figure 5, a dosing assembly and additive supply 19 for introducing an additive in the materials which will then be introduced into the mixer.
  • Such an additive may be constituted for example by a solid binder such as lime, cement, gypsum or products derived from these binders or by a stabilizer such as bentonite.
  • the silo or buffer hopper 21 can be fed with successive charges contained in bags or continuously from a storage silo outside the plant 1 according to the invention.
  • the assembly 19 for dosing and supplying additives to the materials coming from the screening installation may further comprise a metered water supply assembly comprising in particular a tank 23 embarked on the platform 2 of the installation to ensure constant physical suction conditions of water over time to allow optimal operation of the plant according to the invention.
  • the metering screw 22 associated with the addition product silo 21 which can be of the volumetric or weight type is slaved to the overall flow rate of materials transported by the first conveyor 12 in the form of a weighing conveyor.
  • a weighing table associated with the conveyor belt of the first conveyor 12 makes it possible to supply a flow signal to a control installation disposed in an electric power supply and control cabinet (reference 24 in FIG. 2).
  • the cabinet 24 embarked on the platform 2 of the installation contains a control unit and control of the additive supply means, such as the screw 22 for supplying solid binder or liquid supply means such as that the water of the tank 23 or other means of supply of different adjuvants which are added to the materials, in metered quantities according to the signal provided by the weighing table of the first conveyor 12 or weighing conveyor.
  • the additive supply means such as the screw 22 for supplying solid binder or liquid supply means such as that the water of the tank 23 or other means of supply of different adjuvants which are added to the materials, in metered quantities according to the signal provided by the weighing table of the first conveyor 12 or weighing conveyor.
  • the cabinet 24 encloses all the power circuits and the control and servo-control means of the installation 1.
  • cable remote control means infrared or radio can be associated with the installation to ensure remote control of the installation, for example for its commissioning or shutdown.
  • the installation may comprise a preparation and dosing unit of a bituminous emulsion which may for example be introduced into the mixer 15 to obtain, at the outlet of the mixer 15, a product such as gravels mixed with bituminous emulsion or cold mixes.
  • the preparation and dosing unit of the bituminous emulsion may be associated with a bitumen foam production unit for producing a product consisting of gravel mixed with bitumen foam.
  • the frame 2 which may comprise, as shown in Figures 1, 2 and 4, crutches 25, for example four extendable crutches.
  • the set of crutches constitutes an expanding and lifting system of the platform and of the entire installation, as shown in FIG. 4 which shows the crutches 25 in their deployed position ensuring the lifting of the crane.
  • platform 2 and installation 1 as a whole. In this raised position, the plate of a road trailer can be engaged under the frame 2 for the loading and the transfer of the installation 1.
  • the platform 2 can be equipped with a running gear and a fifth wheel, so as to constitute in itself a semi-trailer road.
  • the platform 2 can also be equipped with tracks to move on a site regardless of the nature of the site soil.
  • the platform may be equipped with a shield allowing the support of a loading ramp, for example a loading ramp of the hopper 5 for loading the raw materials and / or the storage silo 21. 'additive.
  • the device according to the invention makes it possible to sort and process materials of very different natures, in particular to obtain mixtures or products containing at least two different size fractions extracted from a crude raw material.
  • the installation according to the invention makes it possible to carry out a preliminary sorting and classification of the raw materials if this sorting and classification are necessary. If the sorting and classification are not necessary, it is possible to eliminate the passage through the screening installation 10, for example by providing a mounting of the screening plant 10 on the platform 2 allowing its movement in the longitudinal direction, so that the raw products extracted from the loading hopper 5 are no longer poured on the input end of the screen, but directly on the first conveyor 12.
  • the mixer 15 can be made separably from the recovery conveyor 14 and associated with lifting means for placing it in a raised position in which the materials discharged by the recovery conveyor no longer enter the blender but are discharged directly outside and behind the installation 1.
  • the plant according to the invention can also make it possible to produce products from mixtures of materials comprising more than two particle size fractions. It is possible to provide a screen comprising, one after the other, more than two screening sections, more than two fractions of different particle sizes and, below each of the successive sections of the screening plant, a conveyor similar to the second conveyor 16, with two directions of circulation, the successive conveyors being placed so that their respective parts of exit and entry are superimposed, so as to recover the materials according to the different grain sizes on a single conveyor which may be a weighing conveyor similar to the first conveyor 12.
  • the installation according to the invention thus makes it possible to carry out numerous operations for sorting and classifying mineral materials and for numerous operations for treating these materials in particular to produce products containing at least two granulometric fractions.

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Description

L'invention concerne un dispositif et un procédé de traitement de matériaux minéraux tels que des terres ou des matériaux de récupération.The invention relates to a device and a method for treating mineral materials such as soil or recovery materials.

Pour pouvoir réutiliser des matériaux de récupération, préparer des produits utilisables à partir de tels matériaux de récupération ou de terres, ou encore pour stabiliser et pour traiter des sols, il peut être nécessaire de réaliser sur les terres ou matériaux de récupération des opérations de tri et, éventuellement, un concassage et/ou un mélange des matériaux avec différents additifs.In order to reuse reclaimed materials, prepare products that can be used with such waste materials or soil, or to stabilize and treat soils, it may be necessary to carry out sorting operations on the soil or waste materials. and, optionally, crushing and / or mixing the materials with different additives.

Il en est ainsi, en particulier, lorsqu'on désire récupérer des déblais de voirie, des bétons de récupération ou des recyclés constitués de divers rejets ou encore mettre en oeuvre ou traiter des terres, par exemple argileuses ou calcaires ou des stériles de découvertes de carrières.This is particularly the case when it is desired to recover road cuttings, recuperated concretes or recycled materials made up of various discharges, or to use or treat earths, for example clayey or calcareous, or waste-rock waste. careers.

De tels matériaux doivent généralement faire l'objet, dans une première étape de traitement, d'une opération de tri et de classification granulométrique.Such materials must generally be the subject, in a first processing step, of a sorting operation and grading classification.

De telles opérations de tri et de classification granulométrique sont généralement nécessaires lorsqu'on désire effectuer le traitement de terres avec ou sans chaulage, la fourniture à un réseau commercial de matériaux sous une forme granulométrique adaptée ou la stabilisation physique de ces matériaux en vue de leur stockage.Such sorting and particle size classification operations are generally necessary when it is desired to carry out the treatment of land with or without liming, the supply to a commercial network of materials in a suitable granulometric form or the physical stabilization of these materials with a view to their storage.

Pour obtenir un matériau sous une forme granulométrique satisfaisante, il peut être nécessaire de réaliser le concassage des refus provenant d'une opération de tri, avant de réincorporer les refus concassés aux matériaux de granulométrie satisfaisante.To obtain a material in a satisfactory particle size, it may be necessary to crush the refusal from a sorting operation, before reincorporating the crushed rejects materials of satisfactory size.

On connaît des machines de pré-triage et de traitement de matériaux tels qu'envisagés ci-dessus qui comportent en particulier une trémie de réception des matériaux minéraux, un extracteur de matériaux minéraux contenus dans la trémie, par le dessous de la trémie, un crible alimenté en matériaux minéraux par l'extracteur et au moins un transporteur de matériaux séparés par le crible disposé en-dessous du crible.Pre-sorting and material treatment machines are known as envisaged above which comprise in particular a receiving hopper for mineral materials, an extractor of mineral materials contained in the hopper, from below the hopper, a sieve fed with mineral materials by the extractor and at least one material carrier separated by the screen disposed below the screen.

Le transporteur est de préférence un transporteur peseur sur lequel on peut réaliser l'incorporation de certains additifs au matériau sur lequel on a effectué le tri. Ce premier transporteur peut réaliser l'alimentation d'une installation telle qu'un malaxeur ou d'un second transporteur de reprise des matériaux à la sortie de l'installation.The conveyor is preferably a weighing conveyor on which it is possible to incorporate certain additives into the material on which sorting has been carried out. This first carrier can realize the feeding of a installation such as a mixer or a second material recovery conveyor at the exit of the installation.

Les refus parvenant à l'extrémité de sortie du crible peuvent être évacués par un troisième transporteur qui alimente par exemple une installation de concassage.The refusals reaching the exit end of the screen can be evacuated by a third conveyor which feeds for example a crushing plant.

Une telle installation connue est satisfaisante, lorsqu'on désire récupérer ou traiter un matériau de granulométrie homogène, c'est-à-dire un matériau dont les dimensions des particules se situent dans une même tranche granulométrique dont le crible assure la sélection. Dans le cas où l'on veut réaliser la récupération ou le traitement d'un matériau comportant au moins deux fractions granulométriques, c'est-à-dire d'un matériau constitué d'au moins une première fraction dans une première tranche granulométrique et une seconde fraction dans une seconde tranche granulométrique, il est nécessaire d'utiliser un second crible et des transporteurs assurant la reprise de la seconde fraction granulométrique qui doit être ajoutée à la première fraction granulométrique.Such a known installation is satisfactory, when it is desired to recover or process a homogeneous particle size material, that is to say a material whose particle size is in the same size range whose screen ensures selection. In the case where it is desired to carry out the recovery or the treatment of a material comprising at least two granulometric fractions, that is to say of a material consisting of at least a first fraction in a first granulometric slice and a second fraction in a second granulometric slice, it is necessary to use a second screen and carriers ensuring the recovery of the second size fraction to be added to the first size fraction.

L'installation de pré-triage et de traitement doit donc être complétée par des dispositifs supplémentaires qui peuvent être complexes et coûteux et dont l'intégration à l'installation peut être difficile.The pre-sorting and processing plant must therefore be supplemented by additional devices that can be complex and expensive and whose integration into the installation can be difficult.

On connaît également dans le document DE-C-4 309 671, étant la base des préambules des revendications indépendantes, un dispositif de traitement de matériaux minéraux tels que des terres ou des matériaux de récupération, comportant une trémie de réception des matériaux minéraux, un extracteur de matériaux minéraux contenus dans la trémie, par le dessous de la trémie, au moins un crible alimenté en matériaux minéraux par l'extracteur et au moins un premier transporteur de matériaux minéraux séparés par le crible, disposé en-dessous d'une partie au moins du crible, dans une direction longitudinale du dispositif de traitement, ce dispositif permettant de traiter des matériaux constitués d'au moins deux fractions granulométriques différentes. Dans ce dispositif, l'utilisation d'un premier convoyeur et d'un second convoyeur permet de décharger éventuellement la première fraction granulométrique sur un tas à l'extérieur de l'installation ce qui réduit le nombre d'opérations possibles.Also known in DE-C-4 309 671, being the basis of the preambles of the independent claims, a device for treating mineral materials such as earth or recovery materials, comprising a receiving hopper of mineral materials, a extractor of mineral materials contained in the hopper, from below the hopper, at least one screen supplied with mineral materials by the extractor and at least one first carrier of mineral materials separated by the screen, arranged below a part at least one sieve, in a longitudinal direction of the treatment device, this device for treating materials consisting of at least two different size fractions. In this device, the use of a first conveyor and a second conveyor can optionally unload the first particle size fraction on a pile outside the installation which reduces the number of possible operations.

Dans le dispositif selon l'invention, le crible comporte un premier tronçon de séparation d'une première fraction granulométrique des matériaux minéraux disposé au-dessus du premier transporteur et au moins un second tronçon de séparation d'une seconde fraction granulométrique des matériaux minéraux disposé à la suite du premier tronçon, dans la direction longitudinale du dispositif, et au moins un second transporteur comportant une extrémité placée au-dessus du premier transporteur est disposé, dans la direction longitudinale, en-dessous du second tronçon du crible, ledit second transporteur étant un transporteur comportant des moyens de commande de déplacement dans l'un quelconque des deux sens de déplacement opposés, dans la direction longitudinale du dispositif de traitementIn the device according to the invention, the screen comprises a first separation section of a first size fraction of mineral materials disposed above the first conveyor and at least a second section of separation of a second size fraction of inorganic materials arranged following the first section, in the longitudinal direction of the device, and at least one second conveyor having one end placed above the first conveyor is arranged, in the longitudinal direction, below the second section of the screen, said second conveyor being a conveyor having displacement control means in any of two opposite directions of movement in the longitudinal direction of the treatment device

L'invention concerne aussi un procédé tel que décrit dans la revendication 14.The invention also relates to a method as described in claim 14.

D'autres particularités sont décrites dans les revendications dépendantes.Other features are described in the dependent claims.

Afin de bien faire comprendre l'invention, on va décrire, à titre d'exemple, en se référant aux figures jointes en annexe, une installation suivant l'invention et sa mise en oeuvre pour réaliser le traitement d'un matériau comportant deux fractions granulométriques différentes.

  • La figure 1 est une vue en élévation latérale de l'installation permettant de mettre en oeuvre l'invention.
  • La figure 2 est une vue de dessus de l'installation représentée sur la figure 1.
  • La figure 3 est une vue de face suivant 3 de la figure 1.
  • La figure 4 est une vue de derrière suivant 4 de l'installation de la figure 1 dans une position relevée.
  • La figure 5 est une vue transversale suivant 5-5 de la figure 1.
In order to clearly understand the invention, an installation according to the invention and its implementation for carrying out the treatment of a material comprising two fractions will be described by way of example with reference to the appended figures. different particle sizes.
  • Figure 1 is a side elevational view of the installation for implementing the invention.
  • Figure 2 is a top view of the installation shown in Figure 1.
  • Figure 3 is a front view along 3 of Figure 1.
  • Figure 4 is a rear view 4 of the installation of Figure 1 in a raised position.
  • Figure 5 is a cross-sectional view 5-5 of Figure 1.

Sur la figure 1, on voit une installation permettant de réaliser une opération de tri et un traitement sur un matériau minéral brut pour obtenir un produit à partir de deux fractions granulométriques du matériau brut de départ dont on réalise la classification.In Figure 1, there is shown an installation for performing a sorting operation and a treatment on a crude mineral material to obtain a product from two size fractions of the raw material of starting which is made classification.

On se réfèrera à l'ensemble des figures et en particulier aux figures 1 et 2 pour décrire l'installation désignée de manière générale par le repère 1.Reference will be made to all the figures and in particular to FIGS. 1 and 2 to describe the installation generally designated by the reference numeral 1.

L'installation 1 comporte une plate-forme 2 qui est munie de pieds d'appui 4 sur le sol du chantier 1, dans la position de service de l'installation 1, la plate-forme 2 qui supporte l'ensemble des composants de l'installation étant dans une disposition horizontale.The installation 1 comprises a platform 2 which is provided with support feet 4 on the floor of the building site 1, in the service position of the installation 1, the platform 2 which supports all the components of the installation being in a horizontal arrangement.

Les composants de l'installation 1 portée par la plate-forme 2 comportent une trémie de chargement 5 dans laquelle sont déversés les matériaux minéraux tels que des terres ou des déblais dont l'installation assure le tri et le traitement.The components of the installation 1 carried by the platform 2 comprise a loading hopper 5 into which are dumped the mineral materials such as earth or cuttings whose installation ensures sorting and processing.

A l'intérieur de la trémie de chargement 5 est placée une grille 6 qui s'étend sur toute la section de la trémie 5, dans un plan horizontal, dans sa position de service et qui peut être relevée par un dispositif de commande hydraulique permettant de faire pivoter la grille 6 d'un angle supérieur à 90°, comme représenté sur la figure 3. Dans la position de la grille 6 représentée sur la figure 3, le basculement de la grille au-delà de la position verticale permet de réaliser le déblocage et la chute à l'extérieur de la trémie, des blocs d'une taille excessive qui pourraient être coincés entre les barreaux 7 de la grille 6. Pour cela, les barreaux 7 sont montés articulés à l'une de leurs extrémités suivant l'un des bords longitudinaux de la grille, de manière à pouvoir pivoter jusqu'à une position verticale, comme représenté sur la figure 3, pour assurer la libération et la chute des blocs coincés dans la grille 6.Inside the loading hopper 5 is placed a grid 6 which extends over the entire section of the hopper 5, in a horizontal plane, in its operating position and which can be raised by a control device to rotate the gate 6 by an angle greater than 90 °, as shown in Figure 3. In the position of the gate 6 shown in Figure 3, the tilting of the gate beyond the vertical position allows to unlock and fall outside the hopper, blocks of an excessive size that could be wedged between the bars 7 of the grid 6. For this, the bars 7 are mounted articulated to one of their ends along one of the longitudinal edges of the grid, so as to be pivotable to a vertical position, as shown in Figure 3, to ensure the release and the fall of the blocks stuck in the grid 6.

Les moyens de basculement hydrauliques de la grille 6 peuvent être commandés avantageusement à distance, par une télécommande du type radio ou infrarouge.The hydraulic tilting means of the gate 6 can be controlled advantageously remotely, by a remote control of the radio or infrared type.

En-dessous de la trémie de chargement 5, est disposé un extracteur 8 constitué par un transporteur comportant des rouleaux horizontaux et un tapis transporteur entraîné par des poulies dans une direction longitudinale de l'installation 1, dans le sens de la flèche 9, de manière à faire parvenir les matériaux contenus dans la trémie de chargement 5 à une première partie d'extrémité d'une installation de criblage 10 s'étendant dans la direction longitudinale de l'installation 1, à la suite de la trémie de chargement 5, vers l'avant de l'installation (partie de droite sur la figure 1 et sur la figure 2).Below the loading hopper 5 is an extractor 8 consisting of a conveyor having horizontal rollers and a conveyor belt driven by pulleys in a longitudinal direction of the plant 1, in the direction of the arrow 9, of in order to convey the materials contained in the loading hopper 5 to a first end portion of a screening installation 10 extending in the longitudinal direction of the installation 1, following the loading hopper 5, towards the front of the installation (right part in Figure 1 and Figure 2).

La direction longitudinale de l'installation 1 est représentée sur la figure 1 par l'axe longitudinal 11 commun à la trémie de chargement 5, à l'extracteur 8 et à l'installation de criblage 10.The longitudinal direction of the installation 1 is represented in FIG. 1 by the longitudinal axis 11 common to the loading hopper 5, to the extractor 8 and to the screening installation 10.

L'installation de criblage 10 comporte, à partir de sa première extrémité située en-dessous et à l'aplomb de l'extrémité de sortie de l'extracteur 8, dans la direction longitudinale 11, un premier tronçon de crible 10a et, à la suite du premier tronçon de crible 10a, un second tronçon de crible 10b s'étendant depuis la seconde extrémité du premier tronçon 10a jusqu'à la seconde extrémité de l'installation de criblage 10 ou extrémité de sortie de l'installation de criblage.The screening plant 10 comprises, from its first end located below and at the end of the outlet end of the extractor 8, in the longitudinal direction 11, a first section of screen 10a and, at following the first section of screen 10a, a second section of screen 10b extending from the second end of the first section 10a to the second end of the screening plant 10 or output end of the screening plant.

L'extracteur 8 est à vitesse variable de manière que son débit puisse être adapté au type de matériaux à trier contenus dans la trémie de chargement 5.The extractor 8 is variable speed so that its flow rate can be adapted to the type of materials to be sorted contained in the loading hopper 5.

La vitesse variable de l'extracteur 8 peut être obtenue par des moyens hydrauliques ou mécaniques, par exemple un variateur à courroie ou à galets, ou encore par des moyens électromécaniques à variation de fréquence ou à courant continu.The variable speed of the extractor 8 can be obtained by hydraulic or mechanical means, for example a drive belt or roller, or by electromechanical means frequency variation or DC.

Le premier et le second tronçons de crible 10a et 10b de l'installation de criblage 10 peuvent être constitués par deux sections successives d'un crible réalisé selon une technique de construction connue, par exemple deux sections successives d'un crible à étoiles ou d'un crible à disques.The first and the second screen sections 10a and 10b of the screening plant 10 may be constituted by two successive sections of a screen made according to a known construction technique, for example two successive sections of a star screen or a screen. a disc screen.

Un crible à étoiles comporte une pluralité d'arbres de direction transversale perpendiculaire à la direction longitudinale de circulation des produits dans le crible placés l'un à la suite de l'autre dans la direction longitudinale sur lesquels sont montées des parties tournantes en forme d'étoiles comportant des branches élastiques, les parties tournantes portées par deux arbres successifs étant décalées les unes par rapport aux autres dans la direction transversale de l'installation de criblage.A star screen comprises a plurality of transverse direction shafts perpendicular to the longitudinal direction of circulation of the products in the screen placed one after the other in the longitudinal direction on which are mounted rotating parts in the shape of a star. stars having elastic branches, the rotating parts carried by two successive shafts being offset relative to each other in the transverse direction of the screening installation.

De tels cribles à étoiles sont proposés, par exemple, par la société allemande BACKERS MASCHINENBAU, et par la société canadienne ERIN SYSTEMS.Such star screens are proposed, for example, by the German company BACKERS MASCHINENBAU, and the Canadian company ERIN SYSTEMS.

Dans le cas où le premier tronçon 10a et le second tronçon de crible 10b sont constitués sous la forme de deux sections successives d'un crible à étoiles, les arbres portant les parties tournantes en étoile dans les deux sections successives de l'installation de criblage sont entraînés séparément à des vitesses différentes l'une de l'autre, de manière à séparer des matériaux bruts, successivement, une première et une seconde fractions granulométriques.In the case where the first section 10a and the second section of screen 10b are constituted in the form of two successive sections of a star screen, the shafts carrying the star rotating parts in the two successive sections of the screening plant are driven separately at different speeds from each other so as to separate raw materials, successively, first and second size fractions.

Ces vitesses sont elles-mêmes variables et réglables, de manière à pouvoir à ajuster les deux fractions granulométriques séparées par le crible.These speeds are themselves variable and adjustable, so as to adjust the two size fractions separated by the screen.

L'entraînement à vitesse variable et réglable des arbres du crible à étoiles peut être obtenu au moyen d'un entraînement hydraulique, mécanique ou électromécanique à variation de fréquence ou à courant continu.The variable speed and adjustable speed drive of the star screen shafts can be achieved by means of a hydraulic, mechanical or electromechanical drive with frequency variation or direct current.

Un crible à disques comporte une pluralité d'arbres parallèles entre eux de direction transversale portant des disques métalliques, par exemple de forme polygonale dont les angles sont garnis de pastilles anti-usure, espacés l'un de l'autre dans la direction transversale, les arbres du crible de direction transversale portant les disques étant disposés successivement dans la direction longitudinale du crible, c'est-à-dire dans la direction de circulation des produits à cribler et les disques de deux arbres successifs dans la direction longitudinale sont décalés l'un par rapport à l'autre dans la direction transversale. Le tri granulométrique des matériaux passant dans le crible peut être réglé en ajustant l'écartement des disques dans la direction transversale.A disk screen has a plurality of mutually transverse parallel shafts carrying metal disks, for example of polygonal shape, the corners of which are lined with anti-wear pads, spaced from one another in the transverse direction, the shafts of the cross-directional screen carrying the disks being arranged successively in the longitudinal direction of the screen, that is to say in the direction of circulation of the products to be screened and the disks of two successive shafts in the longitudinal direction are shifted. relative to each other in the transverse direction. Granulometric sorting of materials passing through the screen can be adjusted by adjusting the gap of the discs in the transverse direction.

Un tel crible à disques est proposé, par exemple, par la société allemande KRONENBERGER GmbH.Such a disk screen is proposed, for example, by the German company KRONENBERGER GmbH.

Dans le cas où le premier tronçon de crible 10a et le second tronçon de crible 10b de l'installation de criblage 10 du dispositif suivant l'invention sont constitués par deux sections successives d'un crible à disques, les disques portés par les arbres dans chacune des sections successives de l'installation de criblage sont disposés avec un écartement, dans la direction transversale, adapté à la fraction granulométrique dont on veut assurer la séparation dans la section du crible. Dans le premier tronçon de crible 10a, les disques fixés sur les arbres rotatifs successifs ont une première distance d'écartement et, dans le second tronçon de crible 10b, les disques fixés sur les arbres rotatifs successifs ont une seconde distance d'écartement.In the case where the first section of screen 10a and the second section of screen 10b of the screening plant 10 of the device according to the invention are constituted by two successive sections of a disc screen, the discs carried by the trees in each of the successive sections of the screening plant are arranged with a spacing, in the transverse direction, adapted to the granulometric fraction which is to be separated in the sieve section. In the first section of screen 10a, the discs fixed on successive rotary shafts have a first spacing distance and, in the second section of screen 10b, the discs fixed on the successive rotary shafts have a second spacing distance.

Dans tous les cas, que le crible soit à étoiles ou à disques, la fraction de matériau séparée correspondant à une fraction granulométrique voulue est récupérée en-dessous du crible, les matériaux s'écoulant par gravité entre les éléments tournants en étoile ou les disques du crible.In any case, whether the screen is star or disk, the fraction of separated material corresponding to a desired particle size fraction is recovered below the screen, the materials flowing by gravity between the star rotating elements or the disks. sieve.

On peut également réaliser le premier tronçon de crible 10a de l'installation de criblage 10 du dispositif suivant l'invention sous la forme d'un crible à étoiles et le second crible 10b sous la forme d'un crible à disques ou inversement, le premier crible 10a sous la forme d'un crible à disques et le second crible 10b sous la forme d'un crible à étoiles. Dans un cas comme dans l'autre, les caractéristiques de réglage du crible à étoiles et du crible à disques sont déterminées de manière à séparer les fractions granulométriques voulues des matériaux minéraux passant sur le crible.It is also possible to carry out the first screen section 10a of the screening plant 10 of the device according to the invention in the form of a star screen and the second screen 10b in the form of a disc screen or conversely, the first screen 10a in the form of a disc screen and the second screen 10b in the form of a star screen. In one case as in the other, the adjustment characteristics of the star screen and discs are determined so as to separate the desired particle size fractions of the mineral materials passing on the screen.

Comme il est visible en particulier sur la figure 1 et sur la figure 5, un premier transporteur 12 est disposé en-dessous du premier crible 10a de l'installation de criblage 10, suivant toute sa longueur et en-dessous d'une partie de l'extracteur 8. Le premier transporteur 12 de type continu s'étend et asure une circulation de matériaux, dans la direction longitudinale, de manière à pouvoir récupérer en continu la fraction granulométrique s'écoulant par gravité en-dessous du premier crible 10a de l'installation de criblage 10 et de la transporter dans la direction longitudinale vers l'arrière du dispositif 1. Une trémie de déversement 13 peut être placée en-dessous du premier crible 10a de l'installation de criblage 10, de manière à diriger la fraction granulométrique séparée par le crible 10a vers la surface supérieure du tapis du premier transporteur 12. La partie d'extrémité de sortie ou partie arrière du premier transporteur 12 est disposée au-dessus d'une extrémité d'entrée d'un transporteur de reprise 14 assurant la reprise des matériaux déversés à la sortie du premier transporteur 12, le mélange des matériaux et l'alimentation d'un mélangeur 15.As can be seen in particular in FIG. 1 and FIG. 5, a first conveyor 12 is disposed below the first screen 10a of the screening plant 10, along its entire length and below a portion of the screen. the extractor 8. The first conveyor 12 of continuous type extends and ensures a flow of materials, in the longitudinal direction, so as to continuously recover the particle size fraction flowing by gravity below the first screen 10a of the screening apparatus 10 and transporting it in the longitudinal direction towards the rear of the device 1. A discharge hopper 13 may be placed below the first screen 10a of the screening plant 10, so as to direct the particle size fraction separated by the screen 10a to the upper surface of the first conveyor belt 12. The outlet end portion or rear portion of the first conveyor 12 is disposed above a input end of a recovery conveyor 14 ensuring the recovery of the materials discharged at the outlet of the first conveyor 12, the mixing of materials and the feed of a mixer 15.

Selon l'invention, de plus, un second transporteur 16 est placé en-dessous et à l'aplomb du second crible 10b ou second tronçon de l'installation de criblage 10, de manière que les matériaux correspondant à la seconde fraction granulométrique séparée des matériaux bruts provenant du premier tronçon de crible 10a par le second crible 10b se déversent, de préférence par l'intermédiaire d'une goulotte 17, sur la surface supérieure du tapis du second transporteur 16 qui assure leur récupération en continu.According to the invention, in addition, a second conveyor 16 is placed below and in line with the second screen 10b or second section of the screening plant 10, so that the materials corresponding to the second size fraction separated from the Raw materials from the first section of screen 10a by the second screen 10b are poured, preferably via a chute 17, on the upper surface of the carpet of the second conveyor 16 which ensures their recovery continuously.

De préférence, le second transporteur 16 est à deux sens de circulation, dans la direction longitudinale 11 de l'installation suivant l'invention, comme représenté par la double flèche 18 sur la figure 1.Preferably, the second conveyor 16 has two directions of circulation, in the longitudinal direction 11 of the installation according to the invention, as represented by the double arrow 18 in FIG.

Lorsque le second transporteur 16 est commandé de manière à se déplacer dans un premier sens, vers l'arrière de l'installation 1 selon l'invention, la fraction de matériau séparée par le crible ayant une seconde granulométrie est déversée sur la surface supérieure du premier transporteur 12, généralement réalisé sous la forme d'un transporteur peseur.When the second conveyor 16 is controlled so as to move in a first direction, towards the rear of the installation 1 according to the invention, the fraction of material separated by the screen having a second particle size is poured onto the upper surface of the first conveyor 12, generally made in the form of a weighing conveyor.

Les matériaux constitués de la première fraction granulométrique s'écoulant depuis le premier crible 10a sur le tapis du premier transporteur 12 et par la seconde fraction granulométrique des matériaux provenant du second crible 10b déversés sur le premier transporteur par le second transporteur 16 sont déversés en continu à l'extrémité de sortie du premier transporteur 12 sur le transporteur de reprise 14 qui est réalisé sous la forme d'un transporteur ayant un tapis d'alimentation mélangeur qui permet de réaliser un mélange sensiblement homogène des deux fractions granulométriques des matériaux avant de déverser le mélange de matériaux dans le mélangeur 15.The materials consisting of the first size fraction flowing from the first screen 10a on the carpet of the first conveyor 12 and the second size fraction of the materials from the second screen 10b discharged on the first conveyor by the second conveyor 16 are continuously discharged. at the outlet end of the first conveyor 12 on the recovery conveyor 14 which is in the form of a conveyor having a mixer feeding belt which allows a substantially homogeneous mixture of the two particle size fractions of the materials before discharging the mixture of materials in the mixer 15.

Lorsque le second transporteur 16 est commandé de manière que le tapis se déplace dans un second sens de circulation dirigé vers l'avant de l'installation 1 selon l'invention, les matériaux de la seconde fraction granulométrique séparés par le seconde crible 10b sont déversés à l'extrémité de sortie du second transporteur 16, par exemple pour être mis au rebut ou pour être transférés dans un concasseur permettant de réaliser un ajustement et une homogénéisation granulométrique de la seconde fraction des matériaux séparée par le second crible 10b. Dans ce cas, les matériaux concassés et dont la granulométrie a été homogénéisée peuvent être réintroduits dans l'installation, par l'intermédiaire d'un transporteur pour être déversés, par exemple sur le premier transporteur 12, puis transportés avec la première fraction granulométrique des matériaux jusqu'au transporteur de reprise 14 qui assure leur mélange. Ces matériaux concassés et homogénéisés quant à leur granulométrie peuvent être également déversés directement sur le transporteur de reprise 14.When the second conveyor 16 is controlled so that the belt moves in a second direction of flow directed towards the front of the installation 1 according to the invention, the materials of the second size fraction separated by the second screen 10b are discharged. at the outlet end of the second conveyor 16, for example to be discarded or to be transferred to a crusher for performing a grain size adjustment and homogenization of the second material fraction separated by the second screen 10b. In this case, the crushed materials whose particle size has been homogenized can be reintroduced into the installation, via a carrier to be dumped, for example on the first conveyor 12, and then transported with the first fraction of the granulometric fraction. materials to the recovery conveyor 14 which ensures their mixing. These crushed and homogenized materials as to their grain size can also be discharged directly onto the recovery conveyor 14.

Le second transporteur 16 peut être avantageusement réalisé sous la forme d'un transporteur à vitesse variable dont la vitesse peut être commandée pour régler le débit des matériaux transportés.The second conveyor 16 may advantageously be in the form of a variable speed conveyor whose speed can be controlled to regulate the flow rate of the transported materials.

De manière connue, l'installation 1 selon l'invention comporte de plus un transporteur 20 d'évacuation des refus de l'installation de criblage 10 dont une première extrémité, ou extrémité d'entrée, est disposée à l'aplomb et en-dessous de l'extrémité de sortie de l'installation de criblage 10, à l'extrémité de sortie du second tronçon de crible 10b.In a known manner, the installation 1 according to the invention furthermore comprises a conveyor 20 for evacuating the refusals of the screening installation 10, a first end of which, or an inlet end, is disposed vertically and vertically. below the output end of the screening plant 10, at the output end of the second section of screen 10b.

Les refus transportés par le transporteur d'évacuation 20 à l'extrémité avant de l'installation 1 peuvent être évacués et éliminés ou encore transférés dans un concasseur, de manière que leur granulométrie soit ajustée et homogénéisée. Ces matériaux concassés et homogénéisés peuvent être réintroduits dans l'installation, par l'intermédiaire du premier transporteur 12, du second transporteur 16 ou du transporteur de reprise 14.The refusals carried by the evacuation conveyor 20 at the front end of the plant 1 can be evacuated and removed or transferred to a crusher so that their particle size is adjusted and homogenized. These crushed and homogenized materials can be reintroduced into the installation, via the first conveyor 12, the second conveyor 16 or the recovery conveyor 14.

Le mélangeur 15 peut être un mélangeur à bras et palettes à deux arbres parallèles ou encore un seul arbre, suivant le débit des matériaux introduits dans le mélangeur.The mixer 15 may be an arm mixer and pallets with two parallel shafts or a single shaft, depending on the flow of materials introduced into the mixer.

Sur la figure 1, on a représenté de manière schématique un mélangeur à deux arbres parallèles.In Figure 1, there is shown schematically a mixer with two parallel shafts.

Le mélangeur 15 peut être également un mélangeur à disques et à bras articulés. De manière générale, le type de mélangeur est adapté aux matériaux introduits pour leur traitement dans le mélangeur.The mixer 15 can also be a mixer with disks and articulated arms. In general, the type of mixer is adapted to the materials introduced for their treatment in the mixer.

De manière avantageuse, le mélangeur 15 peut être réalisé pour pouvoir être incliné dans la direction transversale de l'installation, vers la sortie du mélangeur. On peut ainsi adapter le mélangeur aux caractéristiques de cohésion des mélanges réalisés dans le mélangeur. Le mélangeur comporte, en-dessous des arbres rotatifs 15a et 15b portant les organes de mélange du malaxeur, un fond qui est de préférence mobile dans la direction verticale, grâce à des vérins hydrauliques ou mécaniques de maintien, et articulé autour d'un axe de direction longitudinale pour pouvoir être basculé de manière qu'on réalise le déblocage et le débourrage du mélangeur, en cas de besoin.Advantageously, the mixer 15 can be made to be able to be inclined in the transverse direction of the installation, towards the output of the mixer. It is thus possible to adapt the mixer to the cohesive characteristics of the mixtures made in the mixer. The mixer comprises, beneath the rotary shafts 15a and 15b carrying the mixing members of the kneader, a bottom which is preferably movable in the vertical direction, by means of hydraulic or mechanical holding jacks, and hinged about an axis. longitudinal direction to be tilted so that the unblocking and unclogging of the mixer, if necessary.

De manière avantageuse, l'installation 1 selon l'invention comporte des moyens permettant de corriger la granulométrie ou d'améliorer les caractéristiques physiques du produit à fabriquer.Advantageously, the installation 1 according to the invention comprises means for correcting the particle size or improving the physical characteristics of the product to be manufactured.

Par exemple, l'installation 1 peut comporter, comme représenté en particulier sur la figure 5, un ensemble de dosage et de fourniture d'additif 19 permettant d'introduire un additif dans les matériaux qui seront ensuite introduits dans le mélangeur.For example, the installation 1 may comprise, as shown in particular in Figure 5, a dosing assembly and additive supply 19 for introducing an additive in the materials which will then be introduced into the mixer.

Un tel additif peut être constitué par exemple par un liant solide tel que la chaux, le ciment, le gypse ou des produits dérivés de ces liants ou encore par un stabilisateur tel que la bentonite.Such an additive may be constituted for example by a solid binder such as lime, cement, gypsum or products derived from these binders or by a stabilizer such as bentonite.

L'ensemble 19 permettant l'introduction dans les matériaux d'additifs en quantité dosée comporte en particulier un silo ou trémie 21 et une vis doseuse 22 permettant d'extraire en quantité dosée de l'additif contenu dans le silo 21 et de le déverser sur le premier transporteur 12 assurant le transfert vers le transporteur mélangeur 14 de reprise de la première et de la seconde fractions granulométriques des matériaux, séparées par l'installation de criblage 10.The assembly 19 allowing the introduction into the additive materials in metered quantity comprises in particular a silo or hopper 21 and a metering screw 22 for extracting in metered quantity of the additive contained in the silo 21 and to discharge it. on the first conveyor 12 ensuring the transfer to the mixing conveyor 14 of recovery of the first and the second particle size fractions of the materials, separated by the screening plant 10.

Le silo ou trémie tampon 21 peut être alimenté par charges successives contenues dans des sacs ou en continu à partir d'un silo de stockage extérieur à l'installation 1 selon l'invention.The silo or buffer hopper 21 can be fed with successive charges contained in bags or continuously from a storage silo outside the plant 1 according to the invention.

L'ensemble 19 de dosage et de fourniture d'additifs aux matériaux provenant de l'installation de criblage peut comporter de plus un ensemble d'alimentation en eau en quantité dosée comportant en particulier une citerne 23 embarquée sur la plate-forme 2 de l'installation pour assurer des conditions physiques d'aspiration de l'eau constantes au cours du temps pour permettre un fonctionnement optimal de l'installation suivant l'invention.The assembly 19 for dosing and supplying additives to the materials coming from the screening installation may further comprise a metered water supply assembly comprising in particular a tank 23 embarked on the platform 2 of the installation to ensure constant physical suction conditions of water over time to allow optimal operation of the plant according to the invention.

La vis doseuse 22 associée au silo de produit d'addition 21 qui peut être de type volumétrique ou pondéral est asservie au débit global de matériaux transportés par le premier transporteur 12 réalisé sous la forme d'un transporteur peseur. Une table de pesée associée au tapis de reprise du premier transporteur 12 permet de fournir un signal de débit à une installation de commande disposée dans une armoire électrique d'alimentation en puissance et de commande (référence 24 sur la figure 2).The metering screw 22 associated with the addition product silo 21 which can be of the volumetric or weight type is slaved to the overall flow rate of materials transported by the first conveyor 12 in the form of a weighing conveyor. A weighing table associated with the conveyor belt of the first conveyor 12 makes it possible to supply a flow signal to a control installation disposed in an electric power supply and control cabinet (reference 24 in FIG. 2).

L'armoire 24 embarquée sur la plate-forme 2 de l'installation renferme une unité de commande et d'asservissement des moyens de fourniture d'additif, tels que la vis 22 de fourniture de liant solide ou des moyens de fourniture de liquide tel que l'eau de la citerne 23 ou encore d'autres moyens de fourniture de différents adjuvants qui sont ajoutés aux matériaux, en quantités dosées en fonction du signal fourni par la table de pesage du premier transporteur 12 ou transporteur peseur.The cabinet 24 embarked on the platform 2 of the installation contains a control unit and control of the additive supply means, such as the screw 22 for supplying solid binder or liquid supply means such as that the water of the tank 23 or other means of supply of different adjuvants which are added to the materials, in metered quantities according to the signal provided by the weighing table of the first conveyor 12 or weighing conveyor.

L'armoire 24 renferme l'ensemble des circuits de puissance et les moyens de commande et d'asservissement de l'installation 1.The cabinet 24 encloses all the power circuits and the control and servo-control means of the installation 1.

De manière avantageuse, des moyens de télécommande par câble, par onde infrarouge ou radio peuvent être associés à l'installation pour assurer un pilotage à distance de l'installation, par exemple pour sa mise en service ou son arrêt.Advantageously, cable remote control means, infrared or radio can be associated with the installation to ensure remote control of the installation, for example for its commissioning or shutdown.

En plus des moyens d'addition de liant solide ou liquide ou d'adjuvant qui ont été mentionnés plus haut, l'installation peut comporter un ensemble de préparation et de dosage d'une émulsion bitumineuse qui peut être par exemple introduite dans le mélangeur 15 pour obtenir, en sortie du mélangeur 15, un produit tel que des graves mélangés à de l'émulsion bitumineuse ou des enrobés à froid.In addition to the means for adding solid or liquid binder or adjuvant which have been mentioned above, the installation may comprise a preparation and dosing unit of a bituminous emulsion which may for example be introduced into the mixer 15 to obtain, at the outlet of the mixer 15, a product such as gravels mixed with bituminous emulsion or cold mixes.

L'ensemble de préparation et de dosage de l'émulsion bitumineuse peut être associé à un ensemble de production de mousse de bitume pour réaliser la fabrication d'un produit constitué de graves mélangés à de la mousse de bitume.The preparation and dosing unit of the bituminous emulsion may be associated with a bitumen foam production unit for producing a product consisting of gravel mixed with bitumen foam.

L'ensemble des composants de l'installation 1 suivant l'invention qui ont été décrits plus haut sont portés par le châssis 2 qui peut comporter, comme représenté sur les figures 1, 2 et 4, des béquilles 25, par exemple quatre béquilles extensibles verticales qui peuvent être fixées sur des supports prolongeant transversalement l'installation, par rapport aux bords transversaux de la plate-forme ou du châssis 2, à l'avant et à l'arrière. Dans ce cas, l'ensemble des béquilles constitue un système élargisseur et élévateur de la plate-forme et de l'ensemble de l'installation, comme représenté sur la figure 4 qui montre les béquilles 25 dans leur position déployée assurant le levage de la plate-forme 2 et de l'installation 1 dans son ensemble. Dans cette position relevée, le plateau d'une remorque routière peut être engagé sous le châssis 2 pour le chargement et le transfert de l'installation 1.All the components of the installation 1 according to the invention which have been described above are carried by the frame 2 which may comprise, as shown in Figures 1, 2 and 4, crutches 25, for example four extendable crutches. vertical members which can be fixed on supports extending transversely of the installation, with respect to the transverse edges of the platform or the frame 2, at the front and at the rear. In this case, the set of crutches constitutes an expanding and lifting system of the platform and of the entire installation, as shown in FIG. 4 which shows the crutches 25 in their deployed position ensuring the lifting of the crane. platform 2 and installation 1 as a whole. In this raised position, the plate of a road trailer can be engaged under the frame 2 for the loading and the transfer of the installation 1.

De manière avantageuse, la plate-forme 2 peut être équipée d'un train roulant et d'une sellette d'attelage, de manière à constituer en elle-même une semi-remorque routière.Advantageously, the platform 2 can be equipped with a running gear and a fifth wheel, so as to constitute in itself a semi-trailer road.

La plate-forme 2 peut également être équipée de chenilles permettant de la déplacer sur un chantier quelle que soit la nature du sol du chantier.The platform 2 can also be equipped with tracks to move on a site regardless of the nature of the site soil.

De manière avantageuse, la plate-forme peut être équipée d'un bouclier permettant l'appui d'une rampe de chargement, par exemple une rampe de chargement de la trémie 5 de chargement des matériaux bruts et/ou du silo 21 de stockage d'additif.Advantageously, the platform may be equipped with a shield allowing the support of a loading ramp, for example a loading ramp of the hopper 5 for loading the raw materials and / or the storage silo 21. 'additive.

Le dispositif suivant l'invention permet de réaliser le tri et le traitement de matériaux de natures très diverses, pour obtenir en particulier des mélanges ou produits renfermant au moins deux fractions granulométriques différentes extraites d'un produit brut de départ.The device according to the invention makes it possible to sort and process materials of very different natures, in particular to obtain mixtures or products containing at least two different size fractions extracted from a crude raw material.

L'installation suivant l'invention permet de réaliser un tri et une classification préalables des matériaux bruts si ce tri et cette classification sont nécessaires. Si le tri et la classification ne sont pas nécessaires, il est possible de supprimer le passage par l'installation de criblage 10, par exemple en prévoyant un montage de l'installation de criblage 10 sur la plate-forme 2 permettant son déplacement dans la direction longitudinale, de manière que les produits bruts extraits de la trémie de chargement 5 ne soient plus déversés sur l'extrémité d'entrée du crible, mais directement sur le premier transporteur 12.The installation according to the invention makes it possible to carry out a preliminary sorting and classification of the raw materials if this sorting and classification are necessary. If the sorting and classification are not necessary, it is possible to eliminate the passage through the screening installation 10, for example by providing a mounting of the screening plant 10 on the platform 2 allowing its movement in the longitudinal direction, so that the raw products extracted from the loading hopper 5 are no longer poured on the input end of the screen, but directly on the first conveyor 12.

De même, de manière connue, le mélangeur 15 peut être réalisé de manière séparable du transporteur de reprise 14 et associé à des moyens de levage permettant de le placer dans une position relevée dans laquelle les matériaux déversés par le transporteur de reprise ne pénètrent plus dans le mélangeur mais sont déversés directement à l'extérieur et à l'arrière de l'installation 1.Similarly, in known manner, the mixer 15 can be made separably from the recovery conveyor 14 and associated with lifting means for placing it in a raised position in which the materials discharged by the recovery conveyor no longer enter the blender but are discharged directly outside and behind the installation 1.

L'installation suivant l'invention peut également permettre de réaliser des produits à partir de mélanges de matériaux comportant plus de deux fractions granulométriques. On peut prévoir un crible comportant, l'un à la suite de l'autre, plus de deux tronçons de criblage, de plus de deux fractions de granulométries différentes et, en-dessous de chacun des tronçons de l'installation de criblage successifs, un transporteur analogue au second transporteur 16, à deux sens de circulation, les transporteurs successifs étant placés de manière que leurs parties respectives de sortie et d'entrée soient superposées, de manière à récupérer les matériaux selon les différentes granulométries sur un seul transporteur qui peut être un transporteur peseur analogue au premier transporteur 12.The plant according to the invention can also make it possible to produce products from mixtures of materials comprising more than two particle size fractions. It is possible to provide a screen comprising, one after the other, more than two screening sections, more than two fractions of different particle sizes and, below each of the successive sections of the screening plant, a conveyor similar to the second conveyor 16, with two directions of circulation, the successive conveyors being placed so that their respective parts of exit and entry are superimposed, so as to recover the materials according to the different grain sizes on a single conveyor which may be a weighing conveyor similar to the first conveyor 12.

L'installation suivant l'invention permet donc de réaliser de nombreuses opérations de tri et de classification de matériaux minéraux et de nombreuses opérations de traitement de ces matériaux pour réaliser en particulier des produits renfermant au moins deux fraction granulométriques.The installation according to the invention thus makes it possible to carry out numerous operations for sorting and classifying mineral materials and for numerous operations for treating these materials in particular to produce products containing at least two granulometric fractions.

Claims (14)

  1. Apparatus for treating mineral materials such as earth or reclaimed materials, comprising a hopper (5) for receiving the mineral materials, an extractor (8) for extracting mineral materials contained in the hopper (5) from underneath the hopper (5), at least one screen (10) supplied with mineral materials by the extractor (8) and at least one first transporter (12) of mineral materials separated off by the screen, disposed underneath at least part of the screen (10), in a longitudinal direction (11) of the treatment apparatus (1), the screen (10) comprising a first section (10a) for separating a first granulometric fraction of the mineral materials, which is disposed above the first transporter (12), and at least one second section (10b) for separating a second granulometric fraction of the mineral materials, which is disposed after the first section (10a), in the longitudinal direction (11) of the apparatus, and at least one second transporter (16) having one end located above the first transporter (12) is disposed below the second section (10b) of the screen (10) in the longitudinal direction (11), characterised in that the second transporter (16) is a transporter comprising means for controlling movement in either of two opposite directions of movement (18), in the longitudinal direction (11) of the treatment apparatus (1).
  2. Apparatus according to claim 2, characterised in that the first transporter (12) is a weighing transporter comprising a weighing table for measuring a flow rate of materials transported by the first transporter (12).
  3. Apparatus according to claim 1 or 2, characterised in that the screen (10) is a star-type screen and comprises a first section (10a) and at least one second section (10b) in which transverse steering shafts carrying rotary elements in a star shape are driven at different speeds, so as to carry out the separation of the first granulometric fraction of the mineral materials through the first section (10a) of the screen (10) and the separation of the second granulometric fraction of the mineral materials through the second section (10b) of the screen (10).
  4. Apparatus according to claim 1 or 2, characterised in that the screen (10) is a disc-type screen comprising successive transverse rotary shafts bearing separator discs spaced from one another in the transverse direction on each of the shafts, the discs fixed to the rotary shafts of the first section (10a) of the screen (10) having a first spacing and the discs fixed to the successive rotary shafts of the second section (10b) of the screen (10) having a second spacing, so as to allow the first granulometric fraction of the mineral materials to pass through the first screen section (10a) and to allow the second granulometric fraction of the mineral materials to pass through the second section (10b) of the screen (10).
  5. Apparatus according to claim 1 or 2, characterised in that the screen (10) comprises a first section (10a) consisting of either a star screen or a disc screen, and a second section (10b) consisting of either a disc screen or a star screen, the first section (10a) of the screen (10) and the second section (10b) of the screen being of different types, so as to allow the first granulometric fraction of the mineral materials to pass through the first section (10a) of the screen (10) and to allow the second granulometric fraction of the mineral materials to pass through the second section (10b) of the screen (10).
  6. Apparatus according to any one of claims 1 to 5, characterised in that it further comprises, at one of the longitudinal ends or the back end of the apparatus (1), a mixer (15) and a mixer backup transporter (14) having an entry end vertically aligned with and underneath an exit end of the first transporter (12) and a second opposite end in the longitudinal direction (11) or exit end located so as to pour the mineral materials into the mixer (15).
  7. Apparatus according to any one of claims 1 to 6, characterised in that it further comprises a unit (19) for supplying and metering additives consisting of at least one of the following: a solid or liquid binder, water, bitumen, a bitumen emulsion and an adjuvant.
  8. Apparatus according to claim 7, characterised in that the unit (19) for supplying and metering additives comprises a silo (21) and an extracting and metering screw (22) for extracting a metered amount of an additive from the silo (21) and incorporating it in the mineral materials separated off by the screen (10) and transported by the first transporter (12).
  9. Apparatus according to claim 8, characterised in that the equipment comprises means (24) for controlling a flow rate of additives, by volume or by weight, via the screw (22).
  10. Apparatus according to claim 9, characterised in that the flow rate of additive from the metering screw (22) is subject to a measurement of the flow rate, by weight, of the mineral materials separated off by the screen (10) on the first transporter (12) in the form of a transporter comprising a weighing table.
  11. Apparatus according to any one of claims 1 to 10, characterised in that the treatment apparatus is carried by a platform (2) arranged substantially horizontally when in operation on the ground (3) of a site.
  12. Apparatus according to claim 11, characterised in that the platform (2) carries at least one of the following means for supporting it on the ground (3) of the site:
    height-adjustable strut (25),
    caterpillar track,
    wheelbase.
  13. Apparatus according to claim 11, characterised in that the platform (2) comprises at least one wheelbase and a coupling mechanism, so as to form a road semitrailer.
  14. Method of treating raw materials such as earth or reclaimed materials, comprising passing the raw materials into a screening installation (10) and recovering at least one granulometric fraction of the raw materials, and passing the raw materials successively through a first screen section (10a) in order to separate a first granulometric fraction from the raw materials, then through at least one second screen section (10b) in order to separate at least one second granulometric fraction from the raw materials, recovering the first granulometric fraction and the second granulometric fraction of materials, successively, below the first screen section (10a) and second screen section (10b), respectively, in one direction (11) of travel of the materials, and continuously incorporating the at least one second granulometric fraction in the first granulometric fraction of materials, characterised in that the first granulometric fraction is incorporated with the second granulometric fraction.
EP20020292984 2001-12-07 2002-12-03 Method and device for treating mineral materials such as soil or recycled material Expired - Lifetime EP1317969B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0115874A FR2833194B1 (en) 2001-12-07 2001-12-07 DEVICE AND METHOD FOR TREATING MINERAL MATERIALS SUCH AS LAND OR RECOVERY MATERIAL
FR0115874 2001-12-07

Publications (2)

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EP1317969A1 EP1317969A1 (en) 2003-06-11
EP1317969B1 true EP1317969B1 (en) 2006-03-08

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EP20020292984 Expired - Lifetime EP1317969B1 (en) 2001-12-07 2002-12-03 Method and device for treating mineral materials such as soil or recycled material

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EP (1) EP1317969B1 (en)
DE (1) DE60209679D1 (en)
FR (1) FR2833194B1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE202005003569U1 (en) * 2005-03-02 2005-06-30 Dellschau Solid Baumaschinen Gmbh Mobile ground treatment compact system
FR2889096B1 (en) 2005-07-29 2007-11-02 Recymo Sarl INSTALLATION FOR TREATING LIMONOUS FLOORS OF A SITE AND METHOD FOR TREATING THESE LIMITOUS WINDINGS USING THE SAME
FR2899835B1 (en) * 2006-04-12 2011-04-29 Concept Travaux Publics TRANSPORTABLE MODULAR INSTALLATION FOR THE VALORISATION OF PUBLIC WORKS WASTE
FR2899915B1 (en) * 2006-04-14 2008-07-11 Famatec Soc Par Actions Simpli PROCESS AND ASSEMBLY FOR TREATING MINERAL MATERIALS FROM A TRENCH
GB2478150A (en) * 2010-02-26 2011-08-31 Yorkshire Water Services Ltd A material recycling apparatus for processing trench arisings

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4017652A1 (en) * 1990-06-01 1991-12-05 Gaz Industrieanlagen Gmbh Screening appts. for household and industrial waste - has several stepped screens with shafts driven at rising speeds
DE4309671C1 (en) * 1993-03-25 1994-05-05 Gaz Industrieanlagen Gmbh Processing device for sorting building material waste - has first screen unit with three screen steps to remove and send on parts of different particle size to discharge dump or further sorting units.
DE4408903A1 (en) * 1994-03-16 1995-09-21 Ernst Josef Kronenberger Sieve for processing of excavated materials esp. clay
FR2756769B1 (en) * 1996-12-11 1999-02-05 Eds Equipements De Depollution MOBILE MACHINE FOR TREATING NATURAL LANDS IN SOILS TO BE ABLE TO REUSE IN EMBANKMENTS AND TO DEPOLLUTE POLLUTED SOILS
US5975441A (en) * 1997-12-29 1999-11-02 Burkholder; Melvin M. Apparatus for separating rocks from soil
DE29810885U1 (en) * 1998-06-18 1998-08-20 Neuenhauser Maschinenbau Gmbh & Co. Kg, 49828 Neuenhaus Screening plant

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FR2833194A1 (en) 2003-06-13
DE60209679D1 (en) 2006-05-04
EP1317969A1 (en) 2003-06-11
FR2833194B1 (en) 2004-09-24

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