EP3762148B1 - Verfahren und vorrichtung zur elektrostatischen trennung von körnigen materialien - Google Patents

Verfahren und vorrichtung zur elektrostatischen trennung von körnigen materialien Download PDF

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EP3762148B1
EP3762148B1 EP19714711.9A EP19714711A EP3762148B1 EP 3762148 B1 EP3762148 B1 EP 3762148B1 EP 19714711 A EP19714711 A EP 19714711A EP 3762148 B1 EP3762148 B1 EP 3762148B1
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particles
electrodes
electric field
cylindrical
separation chamber
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French (fr)
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EP3762148A1 (de
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Lucien Dascalescu
Thami ZEGHLOUL
Karim MEDLES
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Centre National de la Recherche Scientifique CNRS
Universite de Poitiers
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Centre National de la Recherche Scientifique CNRS
Universite de Poitiers
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C7/00—Separating solids from solids by electrostatic effect
    • B03C7/02—Separators
    • B03C7/12—Separators with material falling free
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C7/00—Separating solids from solids by electrostatic effect
    • B03C7/006—Charging without electricity supply, e.g. by tribo-electricity, pyroelectricity
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C7/00—Separating solids from solids by electrostatic effect
    • B03C7/02—Separators
    • B03C7/06—Separators with cylindrical material carriers

Definitions

  • the present invention generally relates to a method allowing the sorting of mixtures of granular materials having different electrical characteristics (several non-conductors, or several conductors and non-conductors or even several conductors) by using the forces of the electric field, the forces aerodynamics and gravity.
  • the present invention also relates to a device allowing the implementation of such a method.
  • the method according to the invention applies in particular to the separation of granular materials of millimetric and sub-millimetric size (typically particles whose equivalent diameter is between 50 ⁇ m and 2 mm), in the recycling, mining, pharmaceutical and food industry.
  • millimetric and sub-millimetric size typically particles whose equivalent diameter is between 50 ⁇ m and 2 mm
  • the separation of the finer particles proves to be more complicated to implement, because of the disturbances induced by the aerodynamic forces, of which the effects on the micronized particles (of size less than 500 ⁇ m) exceed those induced by electrical forces.
  • Drum electrostatic separators are the solution of choice for processing millimeter-sized granular conductive and non-conductive material mixtures. They can also be used for the separation of granular mixtures of millimetric size of several non-conductive materials, previously charged by triboelectric effect [1] , or of several conductive materials, based on the differences in density between the constituents [ 2] . These separators are also used for the separation of sub-millimetric mixtures, in particular for the treatment of ores. However, the flow rates of materials to be treated are low, the particles having to be dispersed to form a monolayer on the surface of the drum.
  • separators for sorting mixtures of non-conductive granular materials of larger size (typically from 1 to 8 mm).
  • These separators include a device which uses the triboelectric effect to charge the granular materials, before dropping them through an area of intense electric field, created between two vertical electrodes, one being connected to a high voltage generator and the other to a high voltage generator of opposite polarity or ground.
  • These separators are not suitable for processing particles of sub-millimeter size, because the aerodynamic forces and/or forces of adhesion to the electrodes would be too great and would greatly limit the action of the electric field.
  • the particles charged either by triboelectric effect or by corona discharge are deposited in a single layer on the surface of a metal belt conveyor connected to the earth.
  • the sorting of these particles takes place in the electric field created between this metal strip and a cylindrical electrode, connected to a high voltage power supply and located above the conveyor.
  • This type of separator is also used for sorting granular mixtures of sub-millimeter sizes (typically from 0.25 to 1 mm), but only under laboratory conditions because the productivity in terms of sorting of such a type of separator is limited by the constraint of depositing the particles in a monolayer on the surface of the strip electrode.
  • a tribo-electrostatic separator usable in the food industry [3],[4] the particles are charged by friction while crossing a metal tube under the action of compressed air, before passing, always in a rigorously controlled airflow, in an electric field created between two vertical electrodes of opposite polarity.
  • the particles collected at the two electrodes are sucked into cyclone-type collectors.
  • Such a separator requires periodic cleaning of the electrodes, which makes it unusable in continuous operation, in an industrial context.
  • the cylindrical electrodes can be connected to high voltage DC generators (i.e. typically greater than 5 kV and less than 120 kV) of positive polarities and negative, one of the electrodes being connected to one of the polarities of said generators while the other electrode is connected to the other polarity or to ground.
  • high voltage DC generators i.e. typically greater than 5 kV and less than 120 kV
  • the granular material which it is desired to separate may only comprise particles which do not conduct electricity.
  • the charge of the particles could be carried out by triboelectric effect in a triboelectric charger communicating with the separation chamber via a cone distributor.
  • the granular material which it is desired to separate may comprise a mixture of electrically non-conductive particles and of conductive particles.
  • the particles can be charged in a corona effect charger located upstream of said electrodes.
  • the corona effect occurs in the vicinity of electrodes with a small radius of curvature (tips), subjected to the high DC voltage generated by the voltage generator, as soon as the electric field E at their surface called electrodes becomes sufficiently large (approximately 30 kV/cm), so that the air ionizes and forms a luminous crown around it.
  • the granular material which it is sought to separate may comprise a mixture of electrically conductive particles.
  • the charge of the particles could be carried out by electrostatic induction created by the electric field E generated between the cylindrical electrodes.
  • the difference between the surface electrical resistivities of the materials leads to different electrical charges of the particles which are more or less attracted by the cylindrical electrode, thus leading to their separation. Particle trajectories are also affected by different densities.
  • the particles to be separated can have a diameter of between 0.125 mm and 2 mm.
  • the intensity of the intense electric field E may be between 4 kV/cm and 5 kV/cm.
  • the particles once charged at the end of step A of the process according to the invention, are introduced into the electric field zone in the form of a cylindrical sheet with a thickness of between 1 mm and 5 mm. , depending on the size of the particles making up the mixture to be treated.
  • the recovery step F) of the particles to be separated can be carried out in a collector system, said particles being recovered in intermediate compartments of the collector system, said intermediate compartments being cylindrical, coaxial with the electrodes and each connected to a vacuum cleaner - cyclone.
  • the method according to the invention may also comprise a step of transferring the particles to be separated from the intermediate compartments to the terminal compartments of the collector system, through the cyclone vacuum cleaners.
  • the cylindrical electrodes of the separation chamber can be connected to DC high voltage generators of positive and negative polarities, one of the electrodes being connected to one of the polarities of said generators and the other electrode being connected to the other polarity or to ground, so as to be able to generate an electric field E.
  • the granular material intended to be separated in the device according to the invention is as defined above.
  • the charging device may advantageously be a triboelectric charger communicating with the separation chamber via a cone distributor.
  • the charging device may advantageously be a corona effect and electrostatic induction charger located in the separation chamber upstream of the electrodes, the material supply of said device load being carried out via a cone distributor.
  • the charging device may advantageously be an electrostatic induction charger located in the separation chamber upstream of the electrodes, the material supply of said charging device being carried out via a cone splitter.
  • the means for producing the downward vertical air flow can be vacuum cleaners of the cyclone type, preferably with a controlled flow rate, further allowing the recovery of said particles in the collector system.
  • the electrostatic separation device according to the invention may further comprise, upstream of the charging device, a metering device for granular material capable of controlling the flow rate thereof.
  • the cyclone vacuum cleaners 2250 also allow the transfer of particles 11 and 12 collected in the intermediate compartments 231 and 232 to the final compartments 233 and 234.
  • the cylindrical electrodes 221, 222 are connected to DC high voltage generators of positive and negative polarities, one being connected to one of the polarities of said generators and the other being connected to the other polarity or to earth, so to be able to generate an electric field E, which is perpendicular to the downward vertical airflow 225 generated by the cyclone vacuum cleaners 2250.
  • the figure 1 shows more particularly a first embodiment of the electrostatic separation device according to the invention in which the charging device 21 is a tribo-electric charger 21 (for example with vibrations, with a fluidized bed or with a rotating cylinder) communicating with the separation 22 via a cone distributor 212.
  • the device for separating the figure 1 further comprises, upstream of the tribo-electric feeder 21, a screw feeder 210 to control the flow rate of granular material 1 in the feeder 21.
  • the cleaning of the electrodes 221, 222 and the collection of the particles 11a and 11b once separated are carried out continuously, in a sealed installation, allowing the treatment of granular mixtures 1 of millimeter and sub-millimeter size.
  • the figure 2 shows more particularly a second embodiment of the electrostatic separation device according to the invention in which the charging device 21 is a corona effect charger located in the separation chamber 22 upstream of the electrodes 221, 222.
  • the separation device figure 2 further comprises, upstream of the separation chamber 22, a screw feeder 210 and a cone distributor 211 communicating with the corona effect feeder 21, the screw feeder 210 making it possible to control the flow rate of granular material 1 in the feeder 21.
  • the figures 3A and 3B show more particularly a third embodiment of the electrostatic separation device according to the invention in which the charging device 21 is an electrostatic induction charger located in the separation chamber 22 upstream of the electrodes 221, 222.
  • the picture 3 further comprises, upstream of the separation chamber 22, a screw feeder 210 and a cone distributor 211 communicating with the electrostatic induction feeder 21, the screw feeder 210 making it possible to control the flow rate of granular material 1 in the feeder 21.
  • the figure 7 shows the results of the separation of a mixture composed of 50% ABS and 50% PC.
  • the mixture was charged into a vibration system and then fed into the separator through an oscillating chute.
  • the purity of this separation is close to 100%.
  • the ABS product was polluted by PC particles, and the purity dropped to around 95%.
  • a feasibility test of the electrostatic separation of the constituents of a conductor/conductor mixture was carried out with the electrostatic separation device according to the invention in which the charging device 21 is a corona effect charger (illustrated on the figure 2A ).
  • the sample tested is a sample composed of 1.4 g of copper particles, and 1.4 g of aluminum particles, the diameter of the particles being of the order of 50 ⁇ m.
  • the electrodes were powered at a voltage of 17 kV, for a current of 0.006 mA.
  • More than 70% of the lighter aluminum particles were collected on the inner cylindrical electrode, at a purity close to 100% (as shown in the figure 11 ).
  • the heavier copper particles were recovered from the bins at the lower end of the electrode system in a product weighing 1.2 g and also containing up to 20% aluminum (as shown in the figure 12 ).
  • the rest of the particles of both metals (about 0.5 g) were found "stuck" on the surface of the outer cylindrical electrode (as illustrated in the figure 13 ).
  • a separator 3 tribo -aero-electrostatic with electrode disks 321, 322 .
  • the loading and the separation are carried out in the separation chamber 32 of the separator 3.
  • the mixture of particles is loaded into a fluidized bed and the charged particles are attracted by the electrode discs 321, 322 which evacuate them in their rotational movement.
  • This separator allows separation in a continuous regime with a flow rate of only 10 g/s, with, in addition, sealing and recovery problems, mainly for fine particles, at the outlet of electrodes 321 and 322.
  • the results of this separation as well as sealing and recovery problems 5 are shown on the figure 9 .
  • the figure 10 illustrates the results of the separation of the 50% ABS and 50% PC mixture in a separator 4 known from the state of the prior art: this is a free-fall electrostatic separator 4, with two plate electrodes 421, 422.
  • the mixture was loaded into a vibration system and then fed into separator 4 through an oscillating chute.
  • the free-fall separator 4 does not allow continuous operation and the separation deteriorates as soon as the electrodes 421, 422 are covered with particles.

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  • Electrostatic Separation (AREA)

Claims (17)

  1. Verfahren zur elektrostatischen Trennung eines körnigen Materials (1), das Partikel (11, 11a, 11b, 12, 12a, 12b) umfasst, die einen äquivalenten Durchmesser aufweisen, der zwischen 50 µm und 2 mm liegt, wobei das Verfahren die folgenden Schritte umfasst:
    A. Einleiten, mit konstanter Förderleistung, des körnigen Materials in eine Ladevorrichtung (21), die erlaubt, die Partikel (11, 11a, 11b, 12, 12a, 12b) in Abhängigkeit von deren Art zu laden; dann Laden der Partikel;
    B. Erzeugen eines elektrischen Felds E zwischen zwei vertikalen koaxialen zylindrischen Elektroden (221, 222) mit der Achse (OZ), die in einer Trennkammer (22) angeordnet sind, wobei die Stärke von E zwischen 1 kV/cm und 10 kV/cm schwankt,
    - wobei sich die zwei zylindrischen Elektroden (221, 222) in eine innere zylindrische Elektrode (221) mit einem Außendurchmesser die mit der Achse und eine äußere zylindrische Elektrode (222) mit einem Innendurchmesser dei unterteilen,
    - wobei die zylindrischen Elektroden (221, 222) mit einem Hochspannungs-Gleichspannungs-Generator verbunden sind, wobei eine der Elektroden (221) mit der positiven Klemme des Generators verbunden ist und die andere der Elektroden (222) mit seiner negativen Klemme oder mit der Erde verbunden ist;
    - so dass ein elektrischer Feldbereich (224) mit der Form einer zylindrischen Matte mit der Dicke e gebildet wird, die der Formel (1) entspricht: e = d ei − d ie / 2
    Figure imgb0003
    C. Erzeugen eines zur Richtung des elektrischen Felds E senkrecht abfallenden vertikalen Luftstroms (225) im elektrischen Feldbereich (224) durch Ansaugen und dessen mit der Wirkung der Schwerkraft kombinierte Wirkung den kontinuierlichen Transfer der geladenen Partikel (11, 11a, 11b, 12, 12a, 12b) zum elektrischen Feldbereich (224) gestattet;
    D. Verlagern der geladenen Partikel (11, 11a, 11b, 12, 12a, 12b), wenn sie sich im elektrischen Feldbereich (224) befinden, zu den Elektroden entgegengesetzter Polaritäten (221, 222), um dort anzuhaften;
    E. kontinuierliches Lösen, mit Hilfe von mechanischen Reinigungsmitteln (226) der Oberfläche der Elektroden (221, 222), der an der Oberfläche der Elektroden (221, 222) anhaftenden Partikel (11, 11a, 11b, 12), wobei die mechanischen Reinigungsmittel (226) um die vertikale zentrale Achse (OZ) der Elektroden rotatorisch beweglich sind und die Elektroden (221, 222) fest sind, oder umgekehrt;
    F. kontinuierliches Ausleiten der gelösten Partikel (11, 11a, 11b, 12, 12a, 12b) anhand der kombinierten Wirkung der Schwerkraft und des vertikalen Luftstroms (225); dann
    G. Rückgewinnen der Partikel (11, 11a, 11b, 12).
  2. Verfahren nach Anspruch 1, wobei die Partikel (11, 11a, 11b, 12, 12a, 12b) einen äquivalenten Durchmesser aufweisen, der zwischen 0,125 mm und 2 mm liegt.
  3. Verfahren nach Anspruch 1 oder 2, wobei
    - das körnige Material (1) nur nichtleitende Partikel (11a, 11b) umfasst, die in zwei unterschiedliche Kategorien unterteilt sind,
    - das Laden der Partikel (11a, 11b) durch triboelektrische Wirkung in einem triboelektrischen Ladegerät (21) durchgeführt wird, das mit der Trennkammer über einen Verteilerkegel (211) kommuniziert.
  4. Verfahren nach Anspruch 1 oder 2, wobei:
    • das körnige Material (1) eine Mischung aus nichtleitenden Partikeln (11) und leitenden Partikeln (12) umfasst,
    • das Laden der Partikel (11, 12) in der Trennkammer (22) durch Sprühelektrode in einem Sprühelektroden-Ladegerät (21) durchgeführt wird, das sich den Elektroden (221, 222) vorgelagert befindet.
  5. Verfahren nach Anspruch 1 oder 2, wobei:
    • das körnige Material (1) eine Mischung aus leitenden Partikeln (12a, 12b) umfasst,
    • das Laden der Partikel (12a, 12b) in der Trennkammer (22) durch elektrostatische Induktion durchgeführt wird, die von dem elektrischen Feld entlang der Elektroden (221, 222) erzeugt wird.
  6. Verfahren nach einem der Ansprüche 1 bis 4, wobei die Stärke des starken elektrischen Felds E zwischen 4 kV/cm und 5 kV/cm liegt.
  7. Verfahren nach einem der Ansprüche 1 bis 5, wobei die geladenen Materialien in den elektrischen Feldbereich (224) in Form einer zylindrischen Matte mit einer Dicke eingeleitet werden, die je nach Größe der Partikel zwischen 1 mm und 5 mm liegt.
  8. Verfahren nach einem der Ansprüche 1 bis 6, wobei die zu trennenden Partikel (11, 11a, 11b, 12, 12a, 12b) einen Durchmesser zwischen 0,125 mm und 2 mm aufweisen.
  9. Verfahren nach einem der Ansprüche 1 bis 7, wobei der Schritt des Rückgewinnens F) der Partikel (11, 11a, 11b, 12, 12a, 12b) in einem Sammlersystem (23) durchgeführt wird, wobei die Partikel (11, 11a, 11b, 12) in Zwischenabteilen (231, 232) des Sammlersystems (23) zurückgewonnen werden, wobei die Zwischenabteile zylindrisch, koaxial mit den Elektroden (221, 222) sind und jedes mit einem Zyklonsauger (2250) verbunden ist.
  10. Verfahren nach Anspruch 8, das ferner einen Transferschritt der Partikel (11, 12) von den Zwischenabteilen (231, 232) zu den terminalen Abteilen (233, 234) des Sammlersystems (23) durch die Zykonsauger (2250) hindurch umfasst.
  11. Vorrichtung zur elektrostatischen Trennung eines körnigen Materials (1), das Partikel (11, 11a, 11b, 12, 12a, 12b) umfasst, die einen Durchmesser aufweisen, der zwischen 125 µm und 2 mm liegt, wobei die Vorrichtung umfasst:
    • eine Vorrichtung (21) zum Laden der zu trennenden Partikel (11, 11a, 11b, 12, 12a, 12b);
    • eine Trennkammer (22), die zwei vertikale koaxiale zylindrische Elektroden (221, 222) mit der Achse (OZ) umfasst, die unterteilt sind in
    - eine innere zylindrische Elektrode (221) mit einem Außendurchmesser die und eine äußere zylindrische Elektrode (222) mit einem Innendurchmesser dei,
    - wobei die zylindrischen Elektroden (221, 222) mit einem Hochspannungs-Gleichspannungs-Generator verbunden sind, wobei eine der Elektroden (221) mit der positiven Klemme des Generators verbunden ist und die andere der Elektroden (222) mit seiner negativen Klemme verbunden ist, so dass ein elektrisches Feld E erzeugt werden kann;
    • Mittel zur Erzeugung (2250) eines zur Richtung des elektrischen Feldes E senkrecht abfallenden vertikalen Luftstroms (225) durch Ansaugen in die Trennkammer (22),
    • Reinigungsmittel (226) der Oberfläche der Elektroden (221, 222); und eine Rückgewinnungsvorrichtung (23) der Partikel (11, 11a, 11b, 12),
    dadurch gekennzeichnet, dass die Reinigungsmittel (226) der Oberfläche der Elektroden (221, 222) mechanisch sind, wobei die mechanischen Reinigungsmittel (226) um die Achse (OZ) rotatorisch beweglich sind und die Elektroden (221, 222) fest sind oder umgekehrt.
  12. Vorrichtung nach Anspruch 10, wobei die Ladevorrichtung (21) ein triboelektrisches Ladegerät (21) ist, das mit der Trennkammer (22) über einen Verteilerkegel (212) kommuniziert.
  13. Vorrichtung nach Anspruch 10, wobei die Ladevorrichtung (21) ein Ladegerät mit Sprühelektrode ist, das sich in der Trennkammer (22) den Elektroden (221, 222) vorgelagert befindet, wobei die Versorgung der Ladevorrichtung (21) mit Material durch einen Verteilerkegel (211) hindurch durchgeführt wird.
  14. Vorrichtung nach einem der Ansprüche 10 bis 13, wobei die mechanischen Reinigungsmittel (226) der Oberfläche der Elektroden Bürsten oder Rechen sind.
  15. Vorrichtung nach einem der Ansprüche 10 bis 13, wobei die Mittel zur Erzeugung (2250) eines abfallenden vertikalen Luftstroms (225) Sauger vom Typ Zyklon (2250) sind, die ferner die Rückgewinnung der Partikel (11, 11a, 11b, 12, 12a, 12b) im Sammlersystem (23) gestatten.
  16. Vorrichtung nach Anspruch 15, wobei die Vorrichtung zur Rückgewinnung (23) der Partikel (11, 11a, 11b, 12, 12a, 12b) ein Produktsammlersystem (23) ist, das umfasst:
    - zwei zylindrische, zu dem Elektrodensystem (221, 222) koaxiale und mit den Zyklonsaugern (2250) verbundene Zwischenabteile (231, 232);
    - zwei terminale Abteile (233, 234), zu denen die Partikel (11, 12) von den Zwischenabteilen (231, 232) durch die Zykonsauger (2250) hindurch transferiert werden.
  17. Vorrichtung nach einem der Ansprüche 10 bis 16, die ferner einen Dosierer (210) des körnigen Materials (1) umfasst, der der Ladevorrichtung (21) vorgelagert ist und imstande, dessen Förderleistung zu steuern.
EP19714711.9A 2018-03-07 2019-03-07 Verfahren und vorrichtung zur elektrostatischen trennung von körnigen materialien Active EP3762148B1 (de)

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FR1851983A FR3078638B1 (fr) 2018-03-07 2018-03-07 Procede et dispositif de separation electrostatique de materiaux granulaires
PCT/FR2019/050518 WO2019171011A1 (fr) 2018-03-07 2019-03-07 Procédé et dispositif de séparation électrostatique de matériaux granulaires

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CA2640907A1 (en) * 2007-10-11 2009-04-11 John P. Dunn Grid type electrostatic separator/collector and method of using same
FR2943561B1 (fr) * 2009-03-27 2011-05-20 Apr2 Procede de separation electrostatique d'un melange de granules de materiaux differents et dispositif de mise en oeuvre
JP5578826B2 (ja) * 2009-10-02 2014-08-27 協和産業株式会社 廃プラスチックの選別分離方法および選別分離設備
IT1400411B1 (it) * 2010-05-31 2013-05-31 Cassani Metodo e dispositivo per separare particelle di un determinato materiale sintetico da particelle di diversi materiali sintetici
DE102010026445A1 (de) * 2010-07-08 2012-01-12 Evonik Degussa Gmbh Flugaschetrennung mittels Koronaentladung
CN103480513A (zh) * 2013-09-18 2014-01-01 江苏大学 一种高速涡旋电场旋风分离方法及旋风分离器
FR3015312B1 (fr) 2013-12-24 2016-01-01 Agronomique Inst Nat Rech Procede de fractionnement par voie seche de biomasse lignocellulosique
FR3015311B1 (fr) 2013-12-24 2016-01-01 Agronomique Inst Nat Rech Procede de fractionnement d'un tourteau d'oleagineux et applications de ce procede
CN106000654B (zh) * 2016-05-23 2017-10-27 中国矿业大学 一种颗粒反向进料摩擦电选分离装置
US10226775B2 (en) * 2016-10-25 2019-03-12 LaBaer Apparatus for removing particulate matter from liquids
CN108311288B (zh) * 2017-01-12 2019-08-20 重庆科技学院 能够产生非均匀电场的静电净化设备
CN106994393B (zh) * 2017-05-31 2018-08-17 中国矿业大学 一种圆锥面旋转摩擦电选装置及其电选方法
FR3078638B1 (fr) 2018-03-07 2020-04-10 Universite De Poitiers Procede et dispositif de separation electrostatique de materiaux granulaires

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CN112074350A (zh) 2020-12-11
PL3762148T3 (pl) 2022-07-18
US11305295B2 (en) 2022-04-19
CN112074350B (zh) 2023-01-31
EP3762148A1 (de) 2021-01-13
FR3078638A1 (fr) 2019-09-13
FR3078638B1 (fr) 2020-04-10
WO2019171011A1 (fr) 2019-09-12
US20210078016A1 (en) 2021-03-18
ES2920350T3 (es) 2022-08-03

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