EP2055395B1 - Procédé et dispositif destinés au criblage de particules - Google Patents

Procédé et dispositif destinés au criblage de particules Download PDF

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Publication number
EP2055395B1
EP2055395B1 EP08167886.4A EP08167886A EP2055395B1 EP 2055395 B1 EP2055395 B1 EP 2055395B1 EP 08167886 A EP08167886 A EP 08167886A EP 2055395 B1 EP2055395 B1 EP 2055395B1
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EP
European Patent Office
Prior art keywords
screen
particles
cover
sieve
granulate
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.)
Not-in-force
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EP08167886.4A
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German (de)
English (en)
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EP2055395A2 (fr
EP2055395A3 (fr
Inventor
Dr. Hilmar Von Campe
Werner Buss
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Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
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Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
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Publication of EP2055395A2 publication Critical patent/EP2055395A2/fr
Publication of EP2055395A3 publication Critical patent/EP2055395A3/fr
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Classifications

    • 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
    • B07B1/28—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens
    • 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
    • B07B13/00—Grading or sorting solid materials by dry methods, not otherwise provided for; Sorting articles otherwise than by indirectly controlled devices
    • B07B13/003—Separation of articles by differences in their geometrical form or by difference in their physical properties, e.g. elasticity, compressibility, hardness
    • 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
    • B07B13/00—Grading or sorting solid materials by dry methods, not otherwise provided for; Sorting articles otherwise than by indirectly controlled devices
    • B07B13/04—Grading or sorting solid materials by dry methods, not otherwise provided for; Sorting articles otherwise than by indirectly controlled devices according to size
    • B07B13/05—Grading or sorting solid materials by dry methods, not otherwise provided for; Sorting articles otherwise than by indirectly controlled devices according to size using material mover cooperating with retainer, deflector or discharger
    • 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
    • B07B13/00—Grading or sorting solid materials by dry methods, not otherwise provided for; Sorting articles otherwise than by indirectly controlled devices
    • B07B13/10—Grading or sorting solid materials by dry methods, not otherwise provided for; Sorting articles otherwise than by indirectly controlled devices using momentum effects
    • 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
    • B07B13/00—Grading or sorting solid materials by dry methods, not otherwise provided for; Sorting articles otherwise than by indirectly controlled devices
    • B07B13/14—Details or accessories
    • B07B13/16—Feed or discharge arrangements
    • 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
    • B07B4/00—Separating solids from solids by subjecting their mixture to gas currents
    • B07B4/08—Separating solids from solids by subjecting their mixture to gas currents while the mixtures are supported by sieves, screens, or like mechanical elements
    • 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
    • B07B9/00—Combinations of apparatus for screening or sifting or for separating solids from solids using gas currents; General arrangement of plant, e.g. flow sheets

Definitions

  • the granules forming particles are fed to the melt via pipes. It must be ensured that a largely geometrically homogeneous granules are promoted, so in particular long grains are removed with an aspect ratio of> 3: 1, which otherwise remain stuck and can lead to clogging of the pipe.
  • Sieve cascades can be used to separate needle-shaped particles, wherein usually three sieve channels are arranged one above the other.
  • the inclined arranged gutters are set in vibration, wherein the ejection end of the respective upper gutter projects beyond the beginning of the underlying gutter in the conveying direction, so that the long grains are thrown off and can not fall into the following gutter.
  • the regularly shaped grains fall through the sieve from Siebrinne to Siebrinne.
  • a disadvantage of this method is that even smaller particles such as dust fall through the mesh, so that a dedusting does not take place. Due to the purity requirement, however, it should be avoided that dust is added to the melt, since it is disproportionately heavily contaminated due to the large overall surface area.
  • a further disadvantage is that the dust falling through the sieve cloth also soils the larger particles.
  • drum screening machines which rotate around the cylinder axes and separate too long needles from the granules. These can then slip out of the interior of the drum axis with slightly inclined drum axis.
  • a method of the type mentioned is the DE-C-195 26 841 refer to.
  • Spaced to the sieve bottom are a cover plate or link chain arranged to prevent the elongated grains of one of the fractions from straightening so that they can not fall through the sieve bottom.
  • the distance between the cover plate and the sieve bottom can be adjusted. In order to achieve an optimization with respect to the distance, experiments are carried out.
  • An apparatus for sorting elongate objects is the DE-U-202 18 848 refer to.
  • a plate is provided, which must be adjusted depending on the particle size.
  • Corresponding devices are also the FR-A-2 218 145 and the US-A-4,181,603 refer to.
  • a method for screening materials is the US-A-4,194,970 refer to.
  • a sieve tray is used, which is inclined at an angle preferably between 45 ° and 60 ° to the horizontal.
  • the present invention is based on the object of screening off a granulate or granulate mixture a certain material fraction, which differs geometrically in at least one dimension from the rest of the material.
  • a further aspect of the invention provides that the granules freed from the first particles are dust-poor, it being to be prevented during the screening, that impurities are introduced by abrasion of the material of the device, by means of which the screening takes place.
  • the task should be solved, a To avoid time-consuming adjustment of the gap height between the cover and the screen surface when changing the size of the particles.
  • the object is essentially achieved by using as a cover a film, which hangs on the particles due to gravity, or a plate which extends around an axis extending transversely to the conveying direction of the granules on the sieve surface and in the region of the transverse side of the sieve is pivotable such that an adaptation of a between the first screen surface and the cover extending gap depending on the size and / or shape of the particles takes place.
  • a self-regulating adaptation to the first particles to be aligned along the sieve bottom takes place, so that it is ensured even with fluctuations in the aspect ratio that the desired separation between the first and second particles takes place, a possibility which the prior art when using a plate as Cover does not offer. Therefore, it is also necessary in the prior art that the distance between the cover and the sieve bottom is determined by experiments to perform the desired separation. But also chain suspensions do not offer this possibility, since they can move along the transport direction of the particles, so that as a result an erection of the non-sieved particles can not necessarily be prevented. Furthermore, the chains of the hanger can have a distance from one another, which offers the possibility that particles which can not be removed are not caught by the chains and can thus straighten up.
  • the mesh size is designed such that only the second particles fall through the meshes, which in particular have an aspect ratio ⁇ 3: 1.
  • Aspect ratio means the ratio of the length of the particles to their width. Irrespective of this, as a further criterion for sifting out the first particles, it must be stated in principle that the length of the first particles is greater than 5 mm. Particles of smaller lengths, whose aspect ratio is also greater than 3: 1, are not to be referred to as first particles in the sense indicated above.
  • the length specification of more than 5 mm is not a fixed size, but can be varied depending on the material of the granules or the requirements regarding the conveying properties through a pipe system.
  • the inventive method for shredded silicon blanks is applicable, which in turn at high temperatures from a fluidized bed by gas phase deposition of silane at a temperature between 600 ° C and 900 ° C or trichlorosilane at a temperature of 1000 ° C to 1350 ° C in reduced hydrogen are deposited.
  • the resulting poly-silicon is crushed.
  • the grain shape of the material due to the given structure of poly-silicon, is elongated in an approximately circular cross-section (approximately needle-shaped), with usually only very few acicular particles in the total amount. However, these must be completely removed, to the extent mentioned exclude disability during transport through a pipe system.
  • Wafer fracture also used for crystal growth can be correspondingly screened out, wherein, as mentioned, the aspect ratio results from the length of the wafer fragments to its width, which has the wafer fragment perpendicular to the plane defined by the screen when transported on the screen.
  • granules of semiconductor material such as silicon, germanium, GaAs, GaP, CdS, CdTe, CuInSe 2 and other connecting conductors of the grade III-V, II-VI, but also materials such as SiO 2 as base material for the production of quartz, glasses and ceramic materials such as SiC, Al 2 O 3, Si 3 N 4 and other substances which are to be processed as granules, are divided into a material fraction and a sieve fraction, the particles of which have an undesired aspect ratio.
  • the contaminants deposit on the surface so that contamination occurs proportionally to the existing surface. Therefore, according to a further aspect of the invention, it is to be ensured that dust particles formed during comminution, whose grain size is usually ⁇ 10 ⁇ m, are not removed by screening, since otherwise there is the danger that the dust adheres to the larger particles. Therefore, according to the invention, dedusting takes place before the actual screening process.
  • the first sieve may be preceded by a second sieve of smaller mesh size. In particular, mesh sizes between 0.3 mm and 1 mm are to be preferred.
  • the invention proposes that via the second sieve with a mesh size of preferably between 0.3 mm to 1 mm, in particular between 0.5 mm and 0.8 mm, a suction is assigned, which extends above or below the screen.
  • the suction is from the top of the screen to prevent larger particles from clogging from the underside of the screen when aspirated.
  • the granules fall vertically in front of the suction nozzle or opening.
  • the suction flow can be chosen so that the particles of Gutfr forcing, especially those of a grain size with a mean diameter between 0.3 mm to 0.5 mm, are not hawked, whereas microscopic particles ( ⁇ 0.3 mm) from Suction flow detected and thus sucked.
  • the sieve should be arranged above the closed bottom surface of a vibrating sieve, which is in particular vibrated by means of a magnetic vibrator.
  • the sieve forming the bottom between the sieve cloth, which should be made of plastic to avoid metal abrasion, is covered according to the invention with a cover, such as a foil, which may have a thickness between 50 .mu.m and 1 mm, in particular in the range of 500 .mu.m.
  • a cover such as a foil, which may have a thickness between 50 .mu.m and 1 mm, in particular in the range of 500 .mu.m.
  • the particles enter the space between the cover, ie the film and the sieve or the sieve fabric.
  • Uniformly shaped particles may fall through the sieve meshes, whereas due to the cover, the long grains are aligned with their longitudinal axes along the plane defined by the sieve and thus prevented from straightening and falling through the sieve. In this way, it is possible effectively to sieve long grains, so that even single grains in very small amounts of z. B. 1 wt .-% can be reliably screened from the total amount.
  • the long grains fall out of the sieve at the end of the sieve and can be collected and collected in a separate container.
  • the z. B. has a thickness between 2 mm and 4 mm and is inherently stiff.
  • a related plate is pivotally mounted about an axis which is transverse to the conveying direction and above the feeding area of the sieve.
  • the plate is the task side bent so that there is a funnel-shaped opening for the supplied granules.
  • the pivotally mounted plate also results in a self-adjustment.
  • the screen sifting the first particles is preferably inclined to the horizontal, the screening task being at a higher point than the end.
  • a can also z.
  • a process for obtaining a pure granules freed from long-particle particles by, in particular, a combination of screening process and dedusting is provided, wherein the long-grain sieving process according to the invention is connected downstream of dedusting.
  • a device for screening particles of a predetermined size of a longitudinal extension x comprising at least one sieve with a mesh size y spanning an area is characterized in that the sieve of mesh size y with y ⁇ x is covered by a cover with a gap spacing ⁇ s with ⁇ s ⁇ x is and that the transport path of the particles between the sieve and the cover runs.
  • the cover can rest automatically due to gravity on the particles conveyed on the screen.
  • the cover should limit a funnel-shaped feed opening on the task side, through which the particles can be fed to the wire.
  • the cover may be a film having a thickness between 100 ⁇ m and 3 mm, in particular in the range between 500 ⁇ m and 1 mm.
  • the basis weight should be between 5 mg / cm 2 and 150 mg / cm 2 .
  • the film may also be a film filled with a fluid. This has the advantage that the weight of the "film” can be adjusted in a simple manner and designed for the particles to be screened off.
  • the cover is an inherently rigid plate.
  • the cover is pivotally fixed to one above the task side transverse edge of the screen.
  • the first sieve is preceded by a further sieve as a second sieve with a mesh size z with z ⁇ y.
  • the mesh size y of the first screen should be between 2 and 5 mm.
  • the mesh size z of the second screen should preferably be between 0.3 mm and 1 mm, in particular between 0.5 mm and 0.8 mm.
  • an extraction should be arranged above and below the second sieve.
  • the first and second screen should be connected to a vibration device, which may have a magnetic vibrator.
  • the first or second sieve can be bottom of a sieve, wherein the first sieve and the second sieve are possibly sections of a single sieve.
  • the sieve or sieve can also be mounted on a vibrating conveyor.
  • the granular material to be sifted off falls down on a suction opening in front of the first sieve in order to achieve an extremely effective dedusting.
  • the granulate or granule mixture is, in particular, comminuted poly-silicon material which has been deposited from the gas phase from trichlorosilane in reducing hydrogen, without, however, restricting the teaching according to the invention.
  • the corresponding particles are of flat to cylindrically symmetric form.
  • the crushed material is z. B. fed to pulling crystals of a melt. This is done via piping, which may have kinks and corners. Therefore, it must be ensured that particles that do not obey the previously indicated secondary conditions, are removed from the granules, otherwise there is a risk that the particles get caught in the pipes and thus close them.
  • the method according to the invention is preferably intended for comminuted poly-silicon blanks, this does not restrict the teaching according to the invention. Rather, the invention relates generally to granules of semiconductor material such as silicon, germanium, GaAs, GaP, CdS, CdTe, CuInSe 2 and other compound semiconductors of the grade III-V, II-VI, but also to materials such as SiO 2 as a base material for the production of quartz, glasses and ceramic materials such as SiC, Al 2 O 3 , Si 3 N 4 and other substances that are processed as granules. Furthermore, needle-shaped metal parts or particles can also be removed.
  • semiconductor material such as silicon, germanium, GaAs, GaP, CdS, CdTe, CuInSe 2 and other compound semiconductors of the grade III-V, II-VI, but also to materials such as SiO 2 as a base material for the production of quartz, glasses and ceramic materials such as SiC, Al 2 O 3 , Si 3 N 4 and other substances that are processed as
  • the granules of a vibrating trough 10 is supplied, which has a vibrated housing 12 and at a distance from the bottom wall 14 comprises a plane spanning a sieve 18.
  • About the existing plastic sieve 18 is the Granules, so the in Fig. 1
  • shown particles 16, 20 promoted to make a desired separation of fractions of the type described below.
  • Below the sieve 18 is a funnel 22, which opens into an opening, below which a receptacle 24 for the particles is arranged, which pass through the sieve 18.
  • the vibrating device 10 after Fig. 1a has a magnetic vibrator 28 which is connected to the housing 12 and this vibrated.
  • the housing 12 itself can be supported by springs 30, 32 shown in principle on a base.
  • the wire 18 extends to the horizontal (line 34) at an angle ⁇ , which is between 0 ° and 60 °, preferably in the range between 0 ° and 20 °.
  • the task point is above the ejection area.
  • Fig. 3 is purely a principle of a section of the sieve 18 shown.
  • the transport direction of the particles present on the sieve is indicated by the arrow 34.
  • the particles By causing the screen 18 to vibrate, the particles are moved onto roughly parabolas 36, causing elongated particles 38 to rise (Figure 40) and thus fall through the meshes of the screen 18.
  • the particle 38 is one which has the aspect ratio to be avoided with a length which is greater than the mesh size, the above-mentioned disadvantages which occur in conveying the fraction of particles which pass through the sieve 18 can occur and has a maximum length that is smaller than the mesh size.
  • these particles have an aspect ratio ⁇ 3: 1.
  • the invention provides that above the screen 18, a cover 42 extends, which ensures that the particles 38 can not set up as the Fig. 4 can be seen.
  • the particles of the granulate are conveyed between the cover 42 and the sieve 18 along the latter (arrow 34), without the risk that the particles with the aspect ratio> 3: 1, which can also be referred to as long grain, can scale up to an extent such that these enforce the meshes of the sieve 18.
  • the cover 42 is a thin film 114, the z. B. has a thickness between 50 microns and 3 mm.
  • the particles to be screened pass between the film 42 and the screen 18, with uniformly shaped particles having a maximum length dimension smaller than the mesh size falling through the screen meshes. In contrast, the long grains are prevented by the cover 42 from rising and falling through the wire 18.
  • the cover is formed as a film 114, there is the advantage that automatically adjusts the distance between the film, so the cover 42 and the surface of the sieve to the shape of the particles or their size, so that an optimal screening is possible.
  • the film may optionally be filled with a fluid, so to speak, be a flexible flat bag or a bag in order to achieve a desired weight with which the film rests on the particles.
  • a film 114 as the cover 52 has the advantage that a self-adjustment takes place, since the film rests on the particles due to gravity, so that adaptation to the extent of the particles takes place perpendicular to the plane defined by the screen 18. Regardless, the weight of the film 114 ensures that the particles can not straighten up as previously indicated.
  • a cover 48 extends above the screen 18 and is pivotable about an axis 46 which extends transversely to the screen longitudinal axis and in the feed area of the screen 18. This also results in a self-adjusting adaptation to the particles conveyed along the screen 18.
  • the plate 44 On the feed side, the plate 44 is bent to provide an inlet funnel 48 for the particles to be dispensed. In the area of the inlet funnel 48 is a closed bottom plate 19, which merges into the first sieve 18.
  • the sieve 18 with the cover 42 is preceded by a further sieve 50 of smaller mesh size ( Fig. 2 ).
  • the sieves 18 and 50 may be provided in a screening device.
  • the sieves 18, 50 may emanate from a vibrating sieve, which may be inclined to the horizontal, or from a horizontal vibratory conveyor.
  • the vibrating conveyor 100 comprises a housing 102 with, for example, made of metal or abrasion-resistant plastic bottom 104, parallel to the first sieve 18, along which the particles 16, 18 are conveyed.
  • the housing 102 is connected via leaf springs 106, 108 with a bottom plate 110, from which a magnet 112 extends, via which the bottom 104 and thus the housing 102 is attracted against the voltage generated by the leaf springs 106, 108.
  • the housing 102 is vibrated to transport the particles 16, 20 along the screen 18.
  • the particles 16, 20 are moved to throw parabola 52, which should have an angle of preferably 30 ° to 60 °, in particular in about 45 ° to the horizontal, to allow the conveying to the extent required.
  • the cover 44 extends above the sieve 18 and the particles 16, 20 and, according to the invention, has a gravitational force on the particles 16.
  • 20 legend foil 114 is.
  • a feed opening 48 between the foil 114 and plate, respectively 44 and the screen 18 is provided, which tapers in the transport direction, that has a quasi V-shape in section.
  • the closed surface 19 In the region of the feed opening 48 is the closed surface 19, which then passes into the sieve 18.
  • the second screen 50 which has a mesh size preferably in the range between 0.3 mm and 1 mm, preferably between 0.5 mm and 0.8 mm, serves to screen off particulate matter and contaminant dust.
  • the particles conveyed along the second screen 50 are likewise moved on the throwing parabolas 52 by the vibration of the screen 50 and thereby shaken, so that loosely adhering micrometer-sized particles are detached due to the friction of the particles. These can then be sucked either through the sieve 50 down (arrow 54) or upwards (arrow 56).
  • a suction device is provided which has a width which covers the screen mesh over its entire width b.
  • the suction opening should have a cross-section axb, with 5 cm ⁇ a ⁇ sieve length. The larger a is selected, the better removed microparticles can be removed and the lower the likelihood that granulate particles attributable to the good fraction will be extracted with suction.
  • a plurality of suction funnels 58, 60 disposed above the screen 50 to suck the minute particles.
  • the speed at which the particles impinge on the wall of the vibration device should not be greater than about 1 m / s.
  • the oscillation frequency of the first and second sieve can be in the range between 10 Hz and 400 Hz, in particular between 50 Hz and 60 Hz.
  • the conveying speed of the particles along the first and second screen should preferably be between 1 mm / s and 100 mm / s.
  • the suction funnels 58, 60 are preferably arranged above the sieve 50.
  • the area of each funnel 58, 60 should be 20 mm ⁇ 20 mm ⁇ 70% (70% open area).
  • the suction power should be up to 3400 1 / min.
  • Suction surface and suction power should be further coordinated so that the extraction speed is 0.1 to 3 m / s, preferably 0.5 m / s.
  • L Long grain: 1.5 mm ⁇ L: B ⁇ 30 mm, where L is approximately 3 mm to 10 mm.
  • Gutfr forcingp 1.5 mm ⁇ L: B ⁇ 10 mm, wherein L is preferably in the range between 0.5 mm and 3 mm.
  • the aspect ratio L: B for undersize particles should be 1.5 mm ⁇ L:

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Combined Means For Separation Of Solids (AREA)

Claims (16)

  1. Procédé pour tamiser des premières particules d'un granulat constitué de premières et de deuxièmes particules, par convoyage du granulat le long d'une surface tamisante, sachant que les premières particules présentent un rapport d'aspect a1 tel que a1 ≥ n : 1, où n = 2, 3, > 3, et les deuxièmes particules un dimensionnement permettant une chute à travers les mailles de la surface tamisante, que le granulat est convoyé le long de la surface tamisante entre ladite surface et un élément de recouvrement (42, 44) s'étendant le long de la surface tamisante, que du fait de la présence de l'élément de recouvrement, les premières particules sont orientées avec leurs axes longitudinaux s'étendant le long de la surface tamisante, l'extension longitudinale de chaque première particule étant supérieure à l'ouverture de maille du tamis (18) constituant la surface tamisante et l'extension longitudinale de la deuxième particule étant égale ou inférieure à l'ouverture de maille,
    caractérisé en ce
    qu'en tant qu'élément de recouvrement est utilisée une pellicule (114), qui s'applique sur les particules sous l'effet de la gravité, ou une plaque (44) qui peut pivoter autour d'un axe (46) s'étendant perpendiculairement au sens de convoyage du granulat sur la surface tamisante et dans la zone du bord transversal côté alimentation du tamis, et ce de manière telle qu'a lieu une adaptation d'un interstice s'étendant entre la première surface tamisante et l'élément de recouvrement en fonction de la taille et/ou de la forme des particules.
  2. Procédé selon la revendication 1,
    caractérisé en ce
    qu'est utilisée une pellicule présentant un grammage GF tel que 5 mg/cm2 ≤ GF ≤ 150 mg/cm2 et/ou une pellicule présentant une épaisseur dF telle que 100 µm < dF ≤ 3 mm.
  3. Procédé selon au moins une des revendications précédentes,
    caractérisé en ce
    que la première surface tamisante est ajustée par rapport à l'horizontale selon un angle α tel que 0° ≤ α ≤ 60°, en particulier 0° ≤ α ≤ 20°.
  4. Procédé selon au moins une des revendications précédentes,
    caractérisé en ce
    que du côté alimentation du tamis, l'élément de recouvrement limite un orifice d'alimentation s'amincissant dans le sens de convoyage.
  5. Procédé selon au moins une des revendications précédentes,
    caractérisé en ce
    qu'avant le convoyage sur la surface tamisante en tant que première surface tamisante, le granulat est convoyé sur une autre surface tamisante en tant que deuxième surface tamisante, que sur et/ou sous cette dernière et/ou au moyen de cette dernière des particules fines de grande surface, en particulier des particules de poussière, sont éliminées, sachant qu'en particulier les particules fines sont aspirées au-dessus et/ou au-dessous de la deuxième surface tamisante par un ou plusieurs orifice(s) d'aspiration s'étendant de préférence sur la totalité de la largeur de la surface tamisante, et que de préférence est utilisé un orifice général d'aspiration qui présente une section transversale a x b, avec 5 cm ≤ a ≤ 1, b = largeur de la surface tamisante et 1 = longueur de la surface tamisante.
  6. Procédé selon la revendication 5,
    caractérisé en ce
    qu'en tant que tamis de la première surface tamisante est utilisé un tamis dont l'ouverture de maille est comprise entre 2 mm et 5 mm et/ou qu'en tant que tamis de la deuxième surface tamisante est utilisé un tamis dont l'ouverture de maille est comprise entre 0,3 mm et 1 mm, en particulier entre 0,5 mm et 0,8 mm.
  7. Procédé selon au moins une des revendications précédentes,
    caractérisé en ce
    qu'avant d'arriver sur la surface tamisante, le granulat est guidé pour passer devant un orifice d'aspiration en chutant à la verticale.
  8. Procédé selon au moins une des revendications précédentes,
    caractérisé en ce
    qu'en tant que granulat sont mis en oeuvre des ébauches de polysilicium concassées et/ou des débris de tranches de silicium et/ou un matériau semiconducteur tel que silicium, germanium, GaAs, GaP, CdS, CdTe, CuInSe2 et autres semi-conducteurs composés des groupes III-V, II-VI, mais aussi en matériaux tels que SiO2 en tant que matériau de base pour la fabrication de quartz, de verres ainsi que matériaux céramiques tels que SiC, Al2O3, Si3N4 et autres substances transformées en granulat.
  9. Dispositif (10) pour tamiser des particules (16, 20, 38) d'une taille prédéfinie et d'une extension longitudinale x, comprenant au moins un tamis (18) délimitant une surface et ayant une ouverture de maille y, sachant que le tamis ayant une ouverture de maille y telle que y < x est recouvert par un élément de recouvrement (42, 44), que les particules peuvent être convoyées entre l'élément de recouvrement et le tamis le long dudit tamis, et que la largeur utile d'interstice dS entre l'élément de recouvrement et le premier tamis est telle que dS < x,
    caractérisé en ce
    que l'élément de recouvrement (42) qui recouvre le tamis (18) pouvant être animé d'oscillations ou de vibrations est une pellicule (114) s'appliquant sous l'effet de la gravité sur les particules (16, 20, 38) convoyées sur le tamis, ou une plaque (44) qui peut pivoter autour d'un axe (46) s'étendant dans la zone du bord transversal côté alimentation du tamis (18).
  10. Dispositif selon la revendication 9,
    caractérisé en ce
    que du côté alimentation, l'élément de recouvrement (42) limite un orifice d'alimentation (48) s'amincissant dans le sens de convoyage des particules (16, 20).
  11. Dispositif selon la revendication 9 ou 10,
    caractérisé en ce
    que la pellicule (114) présente une épaisseur dF telle que 100 µm ≤ dF ≤ 3 mm et/ou un grammage GF tel que 5 mg/cm2 ≤ GF ≤ 150 mg/cm2.
  12. Dispositif selon l'une des revendications 9 à 11,
    caractérisé en ce
    que l'élément de recouvrement (42) s'applique en s'ajustant automatiquement sur les particules (16, 20, 38) convoyées sur le tamis (18).
  13. Dispositif selon l'une des revendications 9 à 12,
    caractérisé en ce
    que le tamis (18) est incliné par rapport à l'horizontale selon un angle α, sachant qu'en particulier l'angle α est tel que 0° ≤ α ≤ 60°, notamment 0° ≤ α ≤ 20°.
  14. Dispositif selon l'une des revendications 9 à 13,
    caractérisé en ce
    qu'en amont du tamis (18) en tant que premier tamis est placé un autre tamis (50) en tant que deuxième tamis, sachant qu'au-dessus et au-dessous du deuxième tamis (50) est disposé un dispositif d'aspiration (58, 60) qui s'étend de préférence sur la totalité de la largeur du deuxième tamis (50), et que le dispositif d'aspiration (58, 60) s'étendant de préférence le long du deuxième tamis (50) présente une section transversale a x b, avec 5 cm ≤ a ≤ 1, b = largeur du deuxième tamis (50) et 1 = longueur du deuxième tamis.
  15. Dispositif selon la revendication 14,
    caractérisé en ce
    que le premier tamis (18) et le deuxième tamis (50) partent d'un dispositif vibrant commun, sachant qu'en particulier au moins le premier tamis (18) part d'une goulette de tamisage vibrante ou d'un convoyeur horizontal à vibrations (100), et que de préférence le dispositif vibrant présente un vibreur magnétique.
  16. Dispositif selon l'une des revendications 14 ou 15,
    caractérisé en ce
    que le premier tamis présente une ouverture de maille y telle que 2 mm ≤ y ≤ 5mm et/ou que le deuxième tamis (50) présente une ouverture de maille z telle que 0,3 mm ≤ z ≤ 1 mm, en particulier 0,5 mm ≤ z ≤ 0,8 mm.
EP08167886.4A 2007-11-02 2008-10-30 Procédé et dispositif destinés au criblage de particules Not-in-force EP2055395B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102007052473A DE102007052473A1 (de) 2007-11-02 2007-11-02 Verfahren und Vorrichtung zum Aussieben von Partikeln

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EP2055395A3 EP2055395A3 (fr) 2011-03-30
EP2055395B1 true EP2055395B1 (fr) 2014-10-15

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JP5803224B2 (ja) * 2011-04-06 2015-11-04 三菱レイヨン株式会社 振動ふるい機
CN102825210A (zh) * 2012-09-19 2012-12-19 溧阳市超强链条制造有限公司 滚子链条轴套的专用筛选装置
DE102013003523A1 (de) * 2013-03-04 2014-09-04 Dietmar Wacker Rüttelsieb
DE102013218003A1 (de) 2013-09-09 2015-03-12 Wacker Chemie Ag Klassieren von Polysilicium
DE102014225105B4 (de) 2014-12-08 2019-01-03 Currenta Gmbh & Co.Ohg Verfahren zur mechanischen Aufbereitung von Carbonfasern
DE102015203654A1 (de) 2015-03-02 2016-09-08 Wacker Chemie Ag Förderung und Fraktionierung von Polysiliciumgranulat in einer Förderrinne
CN104689982A (zh) * 2015-03-10 2015-06-10 湘西自治州丰达合金科技有限公司 一种锻轧锰自动除粉装置
DE102015206849A1 (de) 2015-04-16 2016-10-20 Wacker Chemie Ag Vorrichtung und Verfahren zur Klassierung und Entstaubung von Polysiliciumgranulat
BR112018070356A2 (pt) * 2016-04-03 2019-01-29 Neumann Bruce um aparelho de peneiração
CN106825393B (zh) * 2016-12-28 2019-01-18 重庆市九明机械制造有限公司 石英砂杂质过滤装置
CN108816347A (zh) * 2018-06-09 2018-11-16 汤永红 一种环保型道路施工装置
CN109849216B (zh) * 2019-03-18 2021-02-02 重庆华塑科技有限公司 一种改性塑料颗粒多级精分装置
CN110180780A (zh) * 2019-05-16 2019-08-30 福州集佳油脂有限公司 一种菜籽油加工用菜籽初步摆动筛选装置
CN113399245A (zh) * 2021-05-10 2021-09-17 桑野 一种建筑施工用物料筛分装置
CN114602789A (zh) * 2022-03-07 2022-06-10 武穴德申建材科技有限公司 一种建筑用机制砂高效除粉分离装置

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US7959008B2 (en) 2011-06-14
EP2055395A2 (fr) 2009-05-06
DE102007052473A1 (de) 2009-05-07
ES2520041T3 (es) 2014-11-11
EP2055395A3 (fr) 2011-03-30
US20090134073A1 (en) 2009-05-28

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