EP0783380B1 - Separateur pneumatique a vitesse reduite - Google Patents

Separateur pneumatique a vitesse reduite Download PDF

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Publication number
EP0783380B1
EP0783380B1 EP95933903A EP95933903A EP0783380B1 EP 0783380 B1 EP0783380 B1 EP 0783380B1 EP 95933903 A EP95933903 A EP 95933903A EP 95933903 A EP95933903 A EP 95933903A EP 0783380 B1 EP0783380 B1 EP 0783380B1
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EP
European Patent Office
Prior art keywords
conduit
air
foraminous member
particulate material
grill
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
Application number
EP95933903A
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German (de)
English (en)
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EP0783380A1 (fr
Inventor
Joseph B. Bielagus
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Beloit Technologies Inc
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Beloit Technologies Inc
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Publication date
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Publication of EP0783380A1 publication Critical patent/EP0783380A1/fr
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    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/02—Pretreatment of the raw materials by chemical or physical means
    • D21B1/026—Separating fibrous materials from waste
    • D21B1/028—Separating fibrous materials from waste by dry methods
    • 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
    • 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
    • B07B1/38—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens oscillating in a circular arc in their own plane; Plansifters
    • 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
    • B07B11/00—Arrangement of accessories in apparatus for separating solids from solids using gas currents
    • B07B11/06—Feeding or discharging 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
    • 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
    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
    • D21B1/00—Fibrous raw materials or their mechanical treatment
    • D21B1/02—Pretreatment of the raw materials by chemical or physical means
    • D21B1/023—Cleaning wood chips or other raw materials

Definitions

  • the present invention relates to apparatuses and methods for separating fractions of a particulate material in general. More particularly, the present invention relates to apparatuses and methods for utilizing air to separate components of a particulate material on the basis of differing density and aerodynamic factors.
  • the air density separator uses a vertical separation chamber through which a stream of air is drawn with a velocity in the range of four to five thousand feet per minute (20,3 to 25,4 m/s). Wood chips to be separated are metered by an auger into the separation chamber where the high velocity air stream disperses the chips evenly over the chamber. The more dense knots fall through the uprising current of air and are rejected. The lighter chips are drawn from the separation chamber by the flow of air and separated from the air by a cyclone.
  • US-A-4,280,903 discloses an apparatus and method for separating mixed particulate material based on density and aerodynamic factors.
  • the material to be separated falls onto a separating medium fixed in a chamber.
  • the chamber is vibrated and the light particles are entrained upwardly by an air stream, whereas the heavier particles traverse the separating medium.
  • US-A-4,299,694 discloses a separating apparatus and method where a series of separating rods or bars are adjustable in relative orientation to regulate the separation velocity and turbulence of an air stream to enhance the separating action.
  • the apparatus and method of the invention comprises the features of claims 1 and 12, respectively.
  • air is drawn through the conduit at a velocity insufficient to disperse the particulate material and the particulate material discharged onto the vibrating foraminous member is evenly dispersed across the cross section of the conduit into the upwardly moving air stream within the conduit.
  • the air density separation apparatus of the present invention employs a vertical air separation chamber.
  • the vertical air separation chamber is connected to a cyclone which in turn is connected to a fan.
  • the fan draws air out of the cyclone which in turn causes air to be drawn up through the open-bottomed separation chamber.
  • air density separators utilized in separating wood chips from wood knots, air is drawn rapidly up through the separation chamber at four to five thousand feet per minute (20.3 to 25.4 m/s).
  • the wood chips are metered into the separation chamber through an air lock or a supply auger.
  • the auger dumps the chips into the high velocity air stream where the high velocity air disperses the chips across the separation chamber so that the rising stream of air may separate the chips based on their density and cross-sectional area.
  • the separation chamber is somewhat longer and the air is drawn up through the chamber at approximately seven hundred to eight hundred feet per minute (3.55 to 4.06 m/s). Because of the relatively low velocity of the air, the air stream itself is noneffective at dispersing the shredded plastic bottles and their associated paper labels evenly into the air stream.
  • a grid of closely spaced narrow bars extends into the separation chamber. The bars are cantilevered into the separation chamber and are caused to vibrate by an oscillatory mounting.
  • the shredded material may be fed by an ordinary chute without an air lock onto the deck of the grid of bars. Air moving rapidly between the bars lifts and separates the various constituents of the shredded bottles.
  • the lightweight paper is drawn up through the separation chamber and into the cyclone.
  • the cyclone removes the lightweight paper from the air stream and air is drawn from the cyclone by a fan.
  • the air density separator of this invention is estimated to remove ninety-five to ninety-eight percent of the paper from a feed of shredded plastic bottles with a loss of plastic with the paper of only zero to one percent.
  • FIG. 1 a low velocity air density separator 20 is shown in FIG. 1.
  • the air density separator 20 has a vertically disposed conduit 22 which defines a vertical air separation chamber 24. Mixed particulate matter 44 is introduced into the separation chamber 24 from a material hopper 58.
  • the air separation chamber 24 is connected by a duct 26 to a cyclone 28.
  • the cyclone is connected to a fan 30. The fan draws air from the cyclone 28 which in turn draws air through the duct 26 which causes a stream of air indicated by arrows 32 to enter the bottom 34 of the conduit 22.
  • the mixed material 44 is discharged from the hopper 58 along an inclined chute 60 onto a foraminous screen formed by a grill 36 disposed within the separation chamber 24.
  • the grill 36 has a multiplicity of closely spaced narrow bars 38 which extend across the conduit 22 between a material inlet 40 and a trash outlet 42.
  • the grill 36 is cantilevered from a mount 46 which resiliently supports the grill 36 on springs 48.
  • a ferromagnetic member 50 is mounted to the grill 36 and is driven by a solenoid 52 to cause the grill 36 to vibrate at about sixty Hertz. Certain material will be entrained in the upwardly moving air and will leave the separation chamber through the duct 26. The remaining particulate material which is not entrained and which is of a size to pass through the grill 36 will exit the separation chamber 24 through the bottom 34 of the conduit 22 and will be collected on a conveyor 35.
  • a conventional air density separator air is drawn up through the separation chamber at four to five thousand feet per minute (20,3 to 25,4 m/s) while the granular material to be separated such as wood chips is dispensed into the air chamber either by a chute with an air lock or by an auger which distributes the material across the separation chamber.
  • the high velocity air stream moving up through the separation chamber is effective to disperse the granular material being separated in the air stream. Materials which are sufficiently dense fall down through the separation chamber whereas lighter materials become entrained in the air and are drawn into a cyclone where they are separated.
  • An air density separator separates a particulate matter depending on what is known in the aerodynamic field as ballistic coefficient.
  • Ballistic coefficient is a function of the density of the object, the area of the object presented to the air stream, and a shape-dependent coefficient.
  • Ballistic coefficient controls the maximum rate at which an object will fall through a still column of air. Because the resistance of an object through the air increases with velocity, an object which is accelerated by the earth's gravitational force eventually reaches a velocity where the acceleration force of gravity is balanced by the drag force of the air through which the object is moving.
  • This principal is used to separate the granular material into two or more components based on the ballistic coefficient of the granules.
  • the granular material By introducing the granules into an upwardly moving stream of air which has a velocity which is greater than the terminal velocity of some of the particles and less than the terminal velocity of other particles, the granular material will be separated into two fractions.
  • an air velocity in the range of four to five thousand feet per minute (20.3 to 25.4 m/s) is chosen which exceeds the terminal velocity of the wood chips, thereby causing them to rise to the top of the air chamber and be transported through a duct to a cyclone.
  • the knots which have a terminal velocity greater than four to five thousand feet per minute (20.3 to 25.4 m/s), fall through the air to exit the bottom of the separation chamber.
  • An exemplary problem addressed by the low velocity air density separator 20 is separating shredded paper from shredded plastic.
  • the recycling of post-consumer plastic bottles has resulted in a feed stock formed by the shredding of plastic milk bottles or plastic pop bottles.
  • the feed stock contains both plastic from the bottles and paper from the labels associated with the bottles.
  • the plastic shards 54 as seen in FIG. 2 are of a thicker gauge of material than the paper or light grade plastic labels, they have a higher ballistic co-efficient and can be separated in theory in an air density separator.
  • both the plastic and the paper are of relatively low ballistic coefficient and so the velocity of the air in the air density separator must be in the range of five hundred to a thousand feet per minute (2.54 to 5.08 m/s), preferably in the range of seven to eight hundred feet per minute (3.55 to 4.06 m/s).
  • the problem with these low velocities can be readily demonstrated by taking a handful of paper confetti such as the punchings from a paper punch and dropping them into the air. Some of the paper punchings will become dispersed and rapidly reach their terminal velocity and slowly settle to the floor. Others, however, will clump together and fall as a unit reaching the floor first.
  • it is observed with lightweight materials they must be adequately dispersed in the column of air moving up through the vertical separation chamber 24 if it is desired to reliably separate them on the basis of their ballistic coefficients.
  • the grill 36 formed of closely spaced narrow bars 38.
  • the bars 38 In a chamber having dimensions of approximately fourteen inches (35.5 cm) by twenty-six inches (66 cm), the bars 38 would have a depth of one and a half inches (3.8 cm) with a thickness of one and a half to three millimeters and a bar to bar gap of between one-eighth and one-fourth of an inch (0.32 and 0.63 cm) when used with a shredded material 44 having an average size of one-quarter inch to one half inch (0.63 cm to 1.27 cm).
  • the bars 38 are formed into the grill 36 within a frame 64.
  • One or more transverse reinforcements may be installed on the underside of the grill 36 formed by the bars 38.
  • shredded plastic and paper is fed on the chute 60 onto the deck 62 of the grill 36.
  • the chute 60 extends partially over the grill 36 within the separation chamber.
  • a cover 63 may be provided to prevent buildup of material on portions of the grill not within the chamber.
  • the vibrating grill 36 disperses the granular material across the deck.
  • the air stream which passes up through the bars 38 of the deck lofts the lightweight paper 56 and entrains it in the flow of air.
  • the heavier plastic 54 slides through the bars and drops out the open end of the duct 22.
  • Table 2 summarizes the results of three tests which were run with twenty pound samples in the air density separator 20.
  • a shredded mixture of plastic and paper having a bulk density of 18.5 pounds per cubic foot (296.5 kg/m 3 ) was fed at a rate of fifteen hundred pounds (680 kg) per hour into the separation chamber, 5.8 percent of the material was recovered from the cyclone as paper and 94.2 percent was recovered from the bottom of the separation chamber and consisted of plastic.
  • test was run at feed rates of two thousand pounds (907 kg) per hour and twenty-five hundred pounds (1134 kg) per hour. A slightly lesser amount of paper was recovered at the higher rates. It appears separation of the paper from the plastic is slightly less effective at higher rates. Visual inspection of the separated plastic and paper indicated that approximately ninety-five to ninety-eight percent of the paper was removed from the plastic and only zero to one percent of the plastic was lost with the removed paper.
  • the air density separator 20 inlet 40 does not require an air lock because of the relatively low velocity of the air.
  • the relatively small effect that openings in the wall 70 of the conduit 22 have on the stream is utilized to allow an oversize tray 72 to extend from the deck 62 of the grill 36 through the wall 74 opposite the inlet wall 70. Trash which has become included in the granular material 44 traverses the sloped grill 36 and exits the duct 22 on the chute 72 which directs the trash for collection in a reject bin 78, as shown in FIG. 1.
  • the cyclone 28 uses centrifugal forces to separate the majority of the particulate material from the air stream.
  • the cyclone has an air lock 80 which allows the paper to be removed from the cyclone.
  • the air that is withdrawn from the cyclone passes through the fan and then into a bag house (not shown) where any residual dust is removed before venting to the atmosphere.
  • the low velocity air density separator 20 may employ a foraminous member of configuration other than a grill of narrow bars.
  • the foraminous member could be a vibrating screen, or a vibrating plate with holes punched therein.
  • the foraminous member could consist of an interdigitating bar screen with alternating bars oscillating one hundred eighty degrees out of phase with respect to adjacent bars.
  • separation chamber 24 of approximately 10 feet in height has been illustrated, the separation chamber may be shorter or longer.
  • the low velocity air density separator may be used to separate products other than shredded post-consumer plastic containers.
  • the density separator 20 has utility for separating dirt and sand from wood chips.
  • vibration is not limited to the vibratory action in a vertical plane produced by the solenoid arrangement shown in FIGS. 1 and 2 but encompasses vibrating in all planes and oscillatory motion such as employed by a bar screen.
  • the grill 36 could be caused to vibrate at other frequencies and other mechanisms for causing the vibration could be employed including a drive employing eccentric weights, cam followers on a crank shaft, piezoelectric actuators and systems caused to vibrate by high amplitude low frequency air pressure waves including sound waves.

Claims (14)

  1. Appareil pour séparer une matière particulaire mixte en se basant sur des facteurs de densité et sur des facteurs aérodynamiques, ledit appareil comprenant:
    un conduit (22) s'étendant essentiellement à la verticale, comportant des parois (70) comprenant un sommet et une base (34) ouverte vers le bas, les parois (70) définissant un passage pour l'écoulement ascendant de l'air, ledit passage possédant une superficie de section;
    une canalisation (26) reliée au sommet du conduit et jointe à ce dernier pour permettre à l'air d'être aspiré vers le haut à travers le conduit (22);
    un ventilateur (30) relié à la canalisation (26) qui aspire de l'air à travers le conduit (22) à une faible vitesse insuffisante pour disperser ladite matière particulaire;
    un élément (36) muni de preforations s'étendant dans le conduit (22) et dans le passage pour l'air, ledit élément (36) muni de preforations s'étendant essentiellement d'une paroi à l'autre dans ledit conduit (22) et comportant des ouvertures de dimensions suffisantes pour laisser passer ladite matière particulaire; et
    un moyen (50, 52) pour faire vibrer l'élément (36) muni de preforations, dans lequel la matière particulaire mixte déchargée sur l'élément (36) muni de preforations est ainsi dispersée de manière essentiellement uniforme à travers ladite superficie de section dans un courant d'air à mouvement ascendant à l'intérieur du conduit (22), des particules individuelles étant ainsi exposées audit courant d'air, certaines particules étant entraínées dans l'air et transportées hors du conduit (22) vers le haut, et d'autres particules traversant l'élément (36) muni de preforations pour quitter la base du conduit.
  2. Appareil selon la revendication 1, dans lequel l'élément (36) muni de preforations comprend plusieurs barres étroites (38) disposées en une relation parallèle en étant écartées l'une de l'autre.
  3. Appareil selon la revendication 2, dans lequel les barres (38) formant la grille (36) possèdent une largeur entre un demi et trois millimètres, et sont espacées l'une de l'autre sur une distance entre un huitième et un quart de pouce (3,2 mm et 6,3 mm).
  4. Appareil selon la revendication 1, dans lequel l'élément (36) muni de preforations est monté en résilience à l'extérieur du conduit (22) et est incliné vers le bas pour pénétrer dans le conduit (22).
  5. Appareil selon la revendication 1, comprenant en outre une glissière d'alimentation (60) s'étendant dans la canalisation et positionnée au-dessus de l'élément (36) muni de preforations pour distribuer la matière particulaire mixte à l'élément (36) muni de preforations.
  6. Appareil selon la revendication 1, comprenant en outre un cyclone (28) monté entre la canalisation (26) et le ventilateur (30).
  7. Appareil selon la revendication 1, dans lequel les parois du conduit définissent une superficie de section et dans lequel le ventilateur (30) possède une capacité d'aspiration entre cinq cent et mille pieds cubes (14,2 et 28,3 m3) d'air par minute par pied carré (0,09 m2) de superficie de section du conduit lorsqu'il est mis en service à sa capacité maximale.
  8. Appareil selon la revendication 1, dans lequel le moyen (50, 52) pour faire vibrer l'élément (36) muni de preforations est un solénoïde (52) qui vient se mettre en contact par voie magnétique avec l'élément (36) muni de preforations de façon à le faire vibrer.
  9. Appareil selon la revendication 1, dans lequel le conduit (22) possède une entrée (40) pour la matière et une sortie (42) pour la matière en dessous de l'entrée et opposée à cette dernière, et dans lequel l'élément (36) muni de preforations s'étend entre l'entrée (40) et la sortie (42) et est incliné vers le bas depuis l'entrée jusqu'à la sortie, si bien que la matière granulaire placée sur l'élément (36) muni de preforations, qui ne tombe à travers l'élément comprenant les microperforations ni n'est entraínée dans un courant d'air se déplaçant vers le haut à travers le conduit (22), progresse le long de l'élément (36) muni de preforations depuis l'entrée (40) jusqu'à la sortie (42) pour se décharger du conduit (22).
  10. Appareil selon la revendication 1, dans lequel le conduit (22) possède une section transversale rectangulaire et dans lequel l'élément (36) muni de preforations possède une aire de surface essentiellement égale à supérieure à la section transversale du conduit (22).
  11. Appareil selon l'une quelconque des revendications 1 à 10, dans lequel la base (34) est ouverte dans l'atmosphère, si bien qu'un courant d'air peut être aspiré depuis la base jusqu'au sommet du conduit (22);
    l'élément (36) muni de preforations est une grille (36) comprenant des barres étroites (38) disposées en une relation parallèle et espacées l'une de l'autre, qui s'étend dans le conduit (22), la grille (36) étant montée en résilience à l'extérieur du conduit (22), si bien que les barres (38) sont inclinées vers le bas pour pénétrer dans le conduit (22);
    le moyen (50, 52) provoquant la vibration de la grille (36) étant monté à l'extérieur du conduit (22) et en relation d'entraínement avec la grille (36); et comprenant en outre
    une glissière d'alimentation (60) s'étendant dans la canalisation (26), qui distribue une matière particulaire mixte comportant au moins deux composants possédant des vitesses terminales différentes, à la grille (36); et
    un cyclone (28) en relation de réception avec la canalisation (26) au sommet du conduit (22), dans lequel le composant de la matière particulaire mixte possédant une vitesse terminale inférieure est entraíné dans l'air aspiré dans le cyclone (28), et est séparé de l'air qui y règne, le ventilateur (30) étant relié au cyclone (28) pour aspirer le courant d'air à travers le conduit (22) et à travers le cyclone (28).
  12. Procédé pour séparer en fractions séparées un courant d'une matière particulaire mixte en se basant sur des facteurs de densité et sur des facteurs aérodynamiques, le procédé comprenant les étapes consistant à:
    distribuer un courant de matière particulaire à un élément vibrant (36) muni de preforations renfermé dans un conduit (22), dans lequel la matière comporte au moins deux composants possédant des vitesses terminales différentes;
    aspirer un courant d'air vers le haut à travers le conduit (22) à une vitesse insuffisante pour disperser la matière, mais à une vitesse suffisante pour entraíner au moins une portion de la matière particulaire;
    faire vibrer l'élément (36) muni de preforations pour disperser la matière de manière essentiellement uniforme à travers la superficie de section du conduit (22) dans le courant d'air se déplaçant vers le haut à l'intérieur du conduit (22), si bien que la matière dispersée peut être séparée sur base de sa vitesse terminale dans le courant d'air, par lequel le composant de la matière particulaire mixte possédant une vitesse terminale inférieure est entraíné dans le courant d'air;
    transporter le composant entraíné de la matière dans le courant d'air vers le haut hors du conduit (22); et
    faire passer le composant non entraíné de la matière particulaire mixte à travers l'élément (36) muni de preforations pour quitter la base (34) du conduit.
  13. Procédé selon la revendication 12, dans lequel le courant d'air est aspiré à travers le conduit (22) à une vitesse entre 500 et 1.000 pieds/minute (2,54 et 5,08 m/s).
  14. Procédé selon la revendication 13, dans lequel la matière particulaire séparée comprend des articles en matière plastique issue de la consommation, qui sont déchiquetés pour former la matière particulaire, et dans lequel un premier composant comprend des fragments de matière plastique et le second composant comprend une matière plus mince possédant une vitesse terminale inférieure.
EP95933903A 1994-09-28 1995-09-25 Separateur pneumatique a vitesse reduite Expired - Lifetime EP0783380B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US31397994A 1994-09-28 1994-09-28
US313979 1994-09-28
PCT/US1995/012095 WO1996009901A1 (fr) 1994-09-28 1995-09-25 Separateur pneumatique a vitesse reduite

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Publication Number Publication Date
EP0783380A1 EP0783380A1 (fr) 1997-07-16
EP0783380B1 true EP0783380B1 (fr) 1999-03-03

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EP95933903A Expired - Lifetime EP0783380B1 (fr) 1994-09-28 1995-09-25 Separateur pneumatique a vitesse reduite

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EP (1) EP0783380B1 (fr)
JP (1) JPH10504761A (fr)
KR (1) KR970706077A (fr)
CA (1) CA2201339A1 (fr)
DE (1) DE69508099D1 (fr)
WO (1) WO1996009901A1 (fr)
ZA (1) ZA958112B (fr)

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US5829597A (en) * 1994-09-28 1998-11-03 Beloit Technologies, Inc. Air density system with air recirculation and gyrating bar feeder
US6283300B1 (en) 1998-08-21 2001-09-04 Joseph B. Bielagus Feed distribution for low velocity air density separation
KR100848477B1 (ko) * 2007-02-22 2008-07-28 한국지질자원연구원 폴리에틸렌테레프탈레이트와 폴리염화비닐 라벨의 분리방법 및 장치
CN103611680B (zh) * 2013-12-18 2016-11-23 山川秀美生态环境工程股份有限公司 一种振动筛
JP6410976B1 (ja) * 2018-03-14 2018-10-24 新日鉄住金エンジニアリング株式会社 成型体の製造方法及び炭化物の製造方法
CN109013278B (zh) * 2018-07-24 2021-03-02 闽清紫扬信息技术有限公司 一种建筑用优质砂砾筛选装置
CN109482496B (zh) * 2018-11-29 2020-06-02 深圳市天天创科有限公司 一种环保型垃圾分类设备
CN111570266A (zh) * 2020-05-22 2020-08-25 甘肃一安建设科技集团有限公司 一种高效率建筑筛沙设备
CN112139005A (zh) * 2020-09-18 2020-12-29 安徽集讯科技有限公司 一种米糠油加工用筛料设备

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US4280903A (en) * 1980-08-06 1981-07-28 Brown & Williamson Tobacco Corporation Apparatus for separating sand from botanical fines
US4299694A (en) * 1980-08-25 1981-11-10 The Direct Reduction Corporation Method and apparatus for char separation from the discharge materials of an iron oxide reducing kiln
DE3126585C2 (de) * 1981-07-06 1983-08-04 Rheinische Braunkohlenwerke AG, 5000 Köln Verfahren zum Abtrennen von Sand aus einem sandhaltigen, getrockneten Braunkohlenhaufwerk
NO177090C (no) * 1993-03-15 1995-07-19 Norsk Hydro As Separator for utskilling av fluidiserbare og ikke fluidiserbare materialer

Also Published As

Publication number Publication date
ZA958112B (en) 1996-05-08
DE69508099D1 (de) 1999-04-08
KR970706077A (ko) 1997-11-03
EP0783380A1 (fr) 1997-07-16
WO1996009901A1 (fr) 1996-04-04
JPH10504761A (ja) 1998-05-12
CA2201339A1 (fr) 1996-04-04

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