EP0760713B1 - Dispositif et procede de separation et de qualification de particules formant un produit granuleux - Google Patents
Dispositif et procede de separation et de qualification de particules formant un produit granuleux Download PDFInfo
- Publication number
- EP0760713B1 EP0760713B1 EP95918502A EP95918502A EP0760713B1 EP 0760713 B1 EP0760713 B1 EP 0760713B1 EP 95918502 A EP95918502 A EP 95918502A EP 95918502 A EP95918502 A EP 95918502A EP 0760713 B1 EP0760713 B1 EP 0760713B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- particles
- fluid
- separation
- guide channel
- flow
- 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.)
- Expired - Lifetime
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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
- B07B11/00—Arrangement of accessories in apparatus for separating solids from solids using gas currents
- B07B11/04—Control 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
- B07B4/02—Separating solids from solids by subjecting their mixture to gas currents while the mixtures fall
Definitions
- the present invention relates to a device for separating and qualifying particles forming a granular product, this device comprising a separation of the particles, means for bringing the particles into the tank, a organ for separating these particles formed from at least one generator of movements arranged to generate in said separation tank, a flow longitudinal of a fluid carrying said particles, and means of recovery of said particles.
- It also relates to a process for separating and qualifying particles forming a granular product, into which we introduce progressively said particles in a separation device such as defined above, and the particles are collected on recovery means placed under said tank, taking into account their longitudinal position on these means of recovery.
- This process has various drawbacks due in particular to the clogging of the sieve and erosion of particles against the mesh of the sieve.
- the device has a closed container in which is placed a tube having one end upstream and a downstream end.
- a hopper is placed above this tube to near its upstream end and allows the introduction of particles.
- a fan is mounted near the downstream opening of the tube and generates a flow closed-circuit air flowing one way through the tube and the other direction between the tube and the closed container. Wires are placed near the upstream end of the tube so as to reduce the turbulence of the air flow and thus create the most laminar possible.
- Recovery bins are arranged in the bottom of the tube, perpendicular to the axis of this tube. The entire device is designed to minimize pressure drops in the tube.
- This device has various drawbacks In particular, the desired laminar flow is difficult to achieve with a device of this type due to the shape of the tank and the circuit that the air has to perform. In practice, a substantially laminar flow cannot be obtained only for relatively low flow velocities, which does not allow sorting of heavy particles. This device is intended to sort particles whose diameter is between 10 and 1000 ⁇ m.
- French patent number FR-975.556 describes a process for the separation and qualification of heterogeneous materials as well as a device for the implementation of this process.
- This device includes means for bringing the particles into a chamber of seperation. The particles are transported by a flow of fluid through a conduit in a rotary drum which opens into said chamber.
- This room of separation has an upper part in which the fluid flow circulates and a lower part in which the fluid flow does not circulate.
- the lower part of this chamber is fitted with hoppers comprising movable flaps which allow recover the particles propelled by the fluid flow and which fall by gravity into these last.
- the hoppers are still provided with an annular distributor at their base. perforated to generate a vertical fluid flow to put the particles back lighter suspended in the room.
- This device which presents multiple moving organs is complex to manufacture.
- the present invention proposes to overcome these drawbacks by providing a device and a process making it possible to obtain a homogeneous flow for high flow speeds, this which allows to separate large particles and thus to diversify the industrial applications of the device.
- the guide channel is substantially cylindrical and is open at both ends.
- the movement generator comprises a pump arranged upstream of the guide channel and arranged to propel the fluid to through this channel.
- the device preferably comprises at least one source of fluid arranged to generate a downward flow of fluid, perpendicular to the longitudinal flow of fluid generated by the motion generator.
- the device comprises at least one vibration generator arranged to generate a vibration of the fluid in the channel guidance, in a transverse direction relative to the longitudinal flow generated by the motion generator.
- the device comprises weighing means arranged to measure the mass of the particles as a function of their position on said particles recovery means, and a data processing device arranged for record these masses and these positions.
- This object is also achieved by a process as defined in the preamble and characterized in what we generate a longitudinal flow of a fluid in the guide channel, without generating of fluid flow in the lower container.
- each transverse portion of particles on the recovery means we establish a curve of the mass of each portion according to its position on the recovery means and we compare the curve of the mass of each portion according to its position on the means of recovery to a similar curve performed using a granular product of reference whose characteristics are known.
- a downward flow of fluid is generated in a direction substantially perpendicular to the direction of the longitudinal flow of fluid generated by said motion generator.
- horizontal vibrations are generated transverse in the separation device.
- the device 10 essentially comprises a separation tank 11 for the particles making up the granular product, a member 12 for separating said particles, means recovery 13 of these particles, weighing means 14 and a device 15 data processing.
- the separation tank 11 is formed by a cylindrical guide channel 16 open to its two ends, and of a lower container 17 closed at its two ends and arranged under the guide channel. Channel 16 and container 17 communicate over their entire length.
- the guide channel is associated with means 18 for supplying said particles, these supply means comprising for example a conveyor belt 19 arranged to transport particles of the granular product to be separated from a source of particles (not shown) at a first end 20, called the downstream end, of the guide channel 16.
- these supply means comprising for example a conveyor belt 19 arranged to transport particles of the granular product to be separated from a source of particles (not shown) at a first end 20, called the downstream end, of the guide channel 16.
- the lower container 17 is formed by two parallel planar walls 21 spaced apart by a distance less than the maximum width of the guide channel 16 and greater than the largest dimension of the particles to be sorted.
- This container 17 has a bottom 22 open and disposed above the recovery means 13. These include an endless conveyor 23, placed over the entire length of tank 11.
- the separation member 12 comprises a movement generator 24 arranged at the downstream end 20 of the guide channel 16 and placed in such a way that it generates a substantially homogeneous and longitudinal fluid flow in this channel.
- the motion generator 24 can for example be a pump, a blower or a water source and its nature depends on the product to be separated. He must be able transmit part of the energy of the fluid flow to the particles, without show no chemical interaction with these particles.
- Weighing means 14 are placed below one end of the ribbon conveyor 23 so that by moving this ribbon, part of the particles which it door falls on these weighing means.
- the data processing device 15 is connected to the weighing means 14 and is arranged to record the masses measured by these weighing means as well as the movements of the endless conveyor 23.
- the separation device 10 described above is mainly used for three different operations, namely the realization of a reference curve, the qualification of a product and sorting of the particles which constitute a product granular.
- FIG. 3 is representative of the particle distribution of a reference product given for given measurement conditions.
- the third operation that can be performed using the device separation of FIGS. 1 and 2, namely the sorting of the particles forming a product, consists in separating these particles into different classes depending on their position on the conveyor belt and use only the relevant class or classes.
- the separation device 30 as illustrated in FIG. 4 differs from that of Figures 1 and 2 essentially by the recovery means 31. These have a separating element 32 produced in the form of a container 33 disposed under the bottom of the tank between two positioning stops 34.
- This device is basically used to separate particles from a product only a fraction of which is of interest.
- the container is placed in a position such that the interesting fraction of the granular product falls into this last when all the particles pass through, the separation tank. So the container allows a product to be collected, the particle content of which interest is particularly high, while the product falling on recovery means outside of container 33, has a particle content interesting little, if any.
- the separation device 40 illustrated in FIG. 5 comprises three generators of vibrations 41 arranged along the guide channel 42 in the part superior of the latter. These three vibration generators generate a transverse acoustic wave in this channel, these waves each having a different natural frequency and / or amplitude. Their purpose is to modify the trajectory of particles passing in their immediate vicinity. The light particles moving in front of one of these generators 41 will have their strongly deviated trajectory whereas the heavy particles will only be weakly influenced by these acoustic waves. So the distribution of particles on the recovery means can be changed by adding these vibration generators. A container 43 is further placed under each of these generators 41 slightly shifted forward, in order to recover the particles in three separate lots. It is possible to modify the amplitude and the frequency of vibrations, as well as the speed of the fluid flow so that obtain optimal separation.
- the separation device 50 illustrated in FIG. 6 three sources 51 of fluid are arranged above the guide channel 52 so as to generate in this channel, a downward vertical fluid flow. These sources 51 of fluid have the same function as the vibration generators 41 illustrated in the figure 5.
- the recovery means 53 comprise two containers 54, 55 one of which 54 is open and connected to evacuation means (not shown) and the other of which 55 is closed. This device is particularly suitable for separating usable particles of a mixture of particles. As in the mode of embodiment illustrated in FIG. 5, it is possible to vary the speeds of the different flows, so as to obtain the best possible separation. These speeds flows are determined experimentally based on the type of product to sort and the desired result.
- the device according to the present invention can be used in many areas for product separation, sorting, qualification and control granular. For each type of use and for each form of result desired, the various components of the device and in particular the generator movements and the means of recovery must be adapted. From many possible applications, we can cite some examples.
- an element of separation on recovery means can be consisting of a transverse wall or a recovery tank into which falls the interesting fraction of the mixture. Determining the position of the wall or the tank allows you to choose the fraction used of the mixture.
- the device according to the present invention can for example also be used to separate a gold powder from the rock that contains it.
- the rock is crushed into fine particles, then introduced into the device.
- the fluid flowing in the guide channel is water.
- Three vertical water jets are arranged at the top of the tank. The particles are driven by the longitudinal water flow. When they cross the first jet vertical water, heavy particles have a high kinetic energy and their trajectory is practically not affected by the water jet. The little particles dense on the other hand are entrained at the bottom of the tank by this first jet of water. When the particles arrive at the second jet of water, they have lost part of their kinetic energy by pressure drop. The second jet of water can thus capture the least dense particles. Finally, the third jet captures the densest particles that can be collected in a independent container. As the gold particles are the densest, the first container will contain a high percentage of gold.
- the separation method according to the present invention further allows the study of the friability of a product. This study can be carried out by passing a batch of product in the device, then stressing that product and passing this same batch through the device. The comparison of the two particle distribution curves characterize the friability of the product.
- the fluid flow circulating in the guide channel is the least turbulent possible. This is very easily obtained in the device according to the present invention, due to the geometric shape of this device. Fluid flow flows mainly in the guide channel. This flow is little affected by the presence of particles since they only cross this channel for a lapse of time very short time. The flow can be relatively turbulent, even for high speeds, allowing large particles to sea.
- the products used can for example be food powders, vegetable seeds, mechanical parts such as timepieces, mineral mixtures or pharmaceutical granules.
- the fluid used for generating a flow can for example be a gas such as air or a neutral gas, or a liquid such as water or mercury.
- the guide channel may have an annular shape so that the fluid circulates in closed circuit in the device. In this way, only a small amount of fluid is required and it is not wasted which can be interesting in the case of an expensive or polluting fluid for example.
- the width of the lower container could be adjustable to suit the dimensions of the particles to be sorted.
- the recovery means could be formed by a conveyor placed perpendicular to the guide channel. This embodiment is similar to the cases illustrated by FIGS. 4 and 5 in which the means of recovery include a container. These means of recovery can also include a container disposed between the parallel walls of the tank.
- the method according to the present invention can be used either only for separate the particles forming the granular product, either to separate them and to qualify.
Landscapes
- Combined Means For Separation Of Solids (AREA)
- Separation Of Solids By Using Liquids Or Pneumatic Power (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Air Transport Of Granular Materials (AREA)
- Devices And Processes Conducted In The Presence Of Fluids And Solid Particles (AREA)
- Control And Other Processes For Unpacking Of Materials (AREA)
Description
- la figure 1 est une vue d'ensemble du dispositif selon la présente invention;
- la figure 2 est une vue en perspective du bac de séparation et des moyens de récupération du dispositif selon la présente invention;
- la figure 3 est une courbe illustrant la quantité de produit obtenue en fonction de la position sur les moyens de récupération; et
- les figures 4 à 6 illustrent des variantes de réalisation du dispositif selon la présente invention.
- on introduit dans le bac de séparation 11, un produit granuleux de référence dont les caractéristiques sont connues;
- on génère simultanément dans le canal de guidage 16 un flux de fluide sensiblement homogène et longitudinal, d'amplitude constante. Ce flux est par exemple un flux d'air;
- le ruban convoyeur sans fin 23 étant immobile, on fait passer toutes les particules dans le dispositif.
- On avance le ruban convoyeur 23 d'une distance correspondant à la résolution de mesure souhaitée;
- on pèse les particules tombées sur les moyens de pesage 14;
- on enregistre cette masse ainsi qu'une référence de positionnement dans le dispositif 15 de traitement de données;
- on évacue les particules des moyens de pesage 14, on avance de nouveau le ruban convoyeur et l'on pèse les particules tombées sur les moyens de pesage.
Claims (11)
- Dispositif de séparation et de qualification de particules formant un produit granuleux, ce dispositif comportant un bac de séparation des particules, des moyens d'amenée des particules dans le bac, un organe de séparation de ces particules formé d'au moins un générateur de mouvements agencé pour générer dans ledit bac de séparation, un flux longitudinal d'un fluide véhiculant lesdites particules, et des moyens de récupération desdites particules, le bac de séparation (11) comportant un canal de guidage (16,42,52) dans lequel circule ledit flux de fluide, et un récipient inférieur (17) dans lequel le flux de fluide ne circule pas, ce canal et ce récipient étant en communication sur toute leur longueur, caractérisé en ce que le récipient inférieur (17) comporte deux parois planes parallèles (21) et un fond (22) comportant au moins une ouverture, la distance entre ces deux parois planes (21) étant inférieure à la largeur maximale du canal de guidage (16,42,52).
- Dispositif selon la revendication 1, caractérisé en ce que le canal de guidage (16,42,52) est sensiblement cylindrique et ouvert à ses deux extrémités.
- Dispositif selon la revendication 1, caractérisé en ce que le générateur de mouvements (24) comporte une pompe disposée en amont du canal de guidage (16) et agencée pour propulser le fluide à travers ce canal.
- Dispositif selon la revendication 1, caractérisé en ce qu'il comporte au moins une source de fluide (51) agencée pour générer un flux de fluide descendant, perpendiculaire au flux longitudinal de fluide généré par le générateur de mouvements (24).
- Dispositif selon la revendication 1, caractérisé en ce qu'il comporte au moins un générateur de vibrations (41) agencé pour générer une vibration du fluide dans le canal de guidage (42), dans une direction transversale par rapport au flux longitudinal généré par le générateur de mouvements.
- Dispositif selon la revendication 1, caractérisé en ce qu'il comporte des moyens de pesage (14) agencés pour mesurer la masse des particules en fonction de leur position sur lesdits moyens de récupération, et un dispositif (15) de traitement de données agencé pour enregistrer ces masses et ces positions.
- Procédé de séparation et de qualification de particules formant un produit granuleux, dans lequel on introduit progressivement lesdites particules dans un dispositif de séparation selon la revendication 1, et l'on récolte les particules sur des moyens de récupération placés sous ledit bac, en tenant compte de leur position longitudinale sur ces moyens de récupération, ce procédé étant caractérisé en ce que l'on génère un flux longitudinal d'un fluide dans le canal de guidage (16,42,52), sans générer de flux du fluide dans le récipient inférieur (17).
- Procédé selon la revendication 7 caractérisé en ce que l'on pèse chaque portion transversale de particules sur les moyens de récupération et en ce que l'on établit une courbe de la masse de chaque portion en fonction de sa position sur les moyens de récupération (13).
- Procédé selon la revendication 8, caractérisé en ce que l'on compare la courbe de la masse de chaque portion en fonction de sa position sur les moyens de récupération (13) à une courbe similaire réalisée en utilisant un produit granuleux de référence dont les caractéristiques sont connues.
- Procédé selon la revendication 7, caractérisé en ce que l'on génère un flux de fluide descendant, dans une direction sensiblement perpendiculaire à la direction du flux longitudinal de fluide généré par ledit générateur de mouvements (24).
- Procédé selon la revendication 7, caractérisé en ce que l'on génère des vibrations horizontales transversales dans le dispositif de séparation (50).
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR9407092A FR2720666B1 (fr) | 1994-06-01 | 1994-06-01 | Dispositif et procédé de séparation de particules formant un produit granuleux. |
FR9407092 | 1994-06-01 | ||
PCT/CH1995/000126 WO1995032810A1 (fr) | 1994-06-01 | 1995-05-31 | Dispositif et procede de separation et de qualification de particules formant un produit granuleux |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0760713A1 EP0760713A1 (fr) | 1997-03-12 |
EP0760713B1 true EP0760713B1 (fr) | 1998-05-13 |
Family
ID=9464065
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP95918502A Expired - Lifetime EP0760713B1 (fr) | 1994-06-01 | 1995-05-31 | Dispositif et procede de separation et de qualification de particules formant un produit granuleux |
Country Status (8)
Country | Link |
---|---|
US (1) | US5871103A (fr) |
EP (1) | EP0760713B1 (fr) |
JP (1) | JP3485572B2 (fr) |
AT (1) | ATE166006T1 (fr) |
CA (1) | CA2191365A1 (fr) |
DE (1) | DE69502495T2 (fr) |
FR (1) | FR2720666B1 (fr) |
WO (1) | WO1995032810A1 (fr) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7104403B1 (en) | 2000-12-20 | 2006-09-12 | The Unimin Corporation | Static two stage air classifier |
US20230019663A1 (en) * | 2020-01-23 | 2023-01-19 | Hans W. Fechner | Method of glue-coating plant particles |
Family Cites Families (17)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR975556A (fr) * | 1942-02-19 | 1951-03-07 | Traitement Ind Des Residus Urb | Procédé et installation pour le classement de matières hétérogènes et en particulier de déchets divers |
US2828011A (en) * | 1953-03-04 | 1958-03-25 | Superior Separator Company | Stratifier and air separator |
US2946438A (en) * | 1955-11-25 | 1960-07-26 | Charbonnages De France | Process and apparatus for the separation of solid particulate materials of different densities and/or different particle sizes |
US3109807A (en) * | 1959-11-27 | 1963-11-05 | Standard Filterbau Gmbh | Gaseous current separator |
GB1161881A (en) * | 1965-11-22 | 1969-08-20 | Ici Ltd | Granulation. |
US3385436A (en) * | 1966-05-31 | 1968-05-28 | V B West | Pneumatic concentrator |
DE1808891A1 (de) * | 1968-11-14 | 1970-06-04 | Alpine Ag | Automatischer Analysensichter |
DE2657754A1 (de) * | 1976-12-20 | 1978-06-29 | Reiff Gmbh & Co Kg Bimsbaustof | Windsichtungsanlage zur trennung von gesteinsmaterial unterschiedlicher korngroesse und wichte |
US4213852A (en) * | 1979-01-15 | 1980-07-22 | Bernard Etkin | Method and apparatus for particle classification |
US4304661A (en) * | 1980-03-10 | 1981-12-08 | Nelson George S | Machines for concentrating ore |
JPH01503368A (ja) * | 1986-08-01 | 1989-11-16 | スタツフオード,ロバート ジヨージ | 風洞内での混合物の選別 |
US5006226A (en) * | 1987-11-02 | 1991-04-09 | Burt Jr Leo O | Fluidized, dry bed, ore concentrator |
EP0353261A1 (fr) * | 1987-11-26 | 1990-02-07 | Hambro Machinery Limited | Appareil de transport et appareil de separation |
US5032256A (en) * | 1990-01-03 | 1991-07-16 | Vickery James D | Method and apparatus for air separation of material |
US5039534A (en) * | 1990-06-22 | 1991-08-13 | The Pillsbury Company | Pea separating apparatus and method of use |
DE9015363U1 (de) * | 1990-11-08 | 1991-01-17 | Christian Pfeiffer Maschinenfabrik GmbH & Co KG, 4720 Beckum | Vorrichtung zur Materialdispergierung |
US5267653A (en) * | 1992-07-23 | 1993-12-07 | Anani Riad M | Sorting method and sorting device |
-
1994
- 1994-06-01 FR FR9407092A patent/FR2720666B1/fr not_active Expired - Fee Related
-
1995
- 1995-05-31 EP EP95918502A patent/EP0760713B1/fr not_active Expired - Lifetime
- 1995-05-31 JP JP53056795A patent/JP3485572B2/ja not_active Expired - Fee Related
- 1995-05-31 WO PCT/CH1995/000126 patent/WO1995032810A1/fr active IP Right Grant
- 1995-05-31 AT AT95918502T patent/ATE166006T1/de not_active IP Right Cessation
- 1995-05-31 US US08/750,105 patent/US5871103A/en not_active Expired - Fee Related
- 1995-05-31 DE DE69502495T patent/DE69502495T2/de not_active Expired - Fee Related
- 1995-05-31 CA CA002191365A patent/CA2191365A1/fr not_active Abandoned
Also Published As
Publication number | Publication date |
---|---|
EP0760713A1 (fr) | 1997-03-12 |
CA2191365A1 (fr) | 1995-12-07 |
ATE166006T1 (de) | 1998-05-15 |
US5871103A (en) | 1999-02-16 |
FR2720666B1 (fr) | 1996-08-23 |
DE69502495D1 (de) | 1998-06-18 |
DE69502495T2 (de) | 1998-12-10 |
WO1995032810A1 (fr) | 1995-12-07 |
JP3485572B2 (ja) | 2004-01-13 |
FR2720666A1 (fr) | 1995-12-08 |
JPH10500894A (ja) | 1998-01-27 |
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