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WO2015047095A1 - Unité de séparation à courant de foucault possédant un rotor magnétique positionné de manière excentrique à l'intérieur d'un tambour externe et de manière coaxiale à l'intérieur d'un tambour interne. - Google Patents

Unité de séparation à courant de foucault possédant un rotor magnétique positionné de manière excentrique à l'intérieur d'un tambour externe et de manière coaxiale à l'intérieur d'un tambour interne. Download PDF

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Publication number
WO2015047095A1
WO2015047095A1 PCT/NL2014/050665 NL2014050665W WO2015047095A1 WO 2015047095 A1 WO2015047095 A1 WO 2015047095A1 NL 2014050665 W NL2014050665 W NL 2014050665W WO 2015047095 A1 WO2015047095 A1 WO 2015047095A1
Authority
WO
WIPO (PCT)
Prior art keywords
drum
magnetic rotor
eddy current
current separator
separator unit
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.)
Ceased
Application number
PCT/NL2014/050665
Other languages
English (en)
Inventor
Jorrit TUIP
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
RECCO BV
Original Assignee
RECCO BV
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by RECCO BV filed Critical RECCO BV
Publication of WO2015047095A1 publication Critical patent/WO2015047095A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • 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
    • B03C1/00—Magnetic separation
    • B03C1/02—Magnetic separation acting directly on the substance being separated
    • B03C1/23—Magnetic separation acting directly on the substance being separated with material carried by oscillating fields; with material carried by travelling fields, e.g. generated by stationary magnetic coils; Eddy-current separators, e.g. sliding ramp
    • B03C1/24—Magnetic separation acting directly on the substance being separated with material carried by oscillating fields; with material carried by travelling fields, e.g. generated by stationary magnetic coils; Eddy-current separators, e.g. sliding ramp with material carried by travelling fields
    • B03C1/247—Magnetic separation acting directly on the substance being separated with material carried by oscillating fields; with material carried by travelling fields, e.g. generated by stationary magnetic coils; Eddy-current separators, e.g. sliding ramp with material carried by travelling fields obtained by a rotating magnetic drum
    • 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
    • B03C2201/00—Details of magnetic or electrostatic separation
    • B03C2201/20—Magnetic separation of bulk or dry particles in mixtures

Definitions

  • Eddy current separator unit having a magnetic rotor positioned eccentrically inside an outer drum and coaxially inside an inner drum.
  • the invention relates to the field of high-intensity eddy current separator units of the type comprising a magnetic rotor which is positioned inside a drum.
  • a conveyor belt is guided over the drum.
  • a stream of fractions which contain non-ferrous metals is conveyed via the belt along the assembly of drum and magnetic rotor.
  • a fast rotating of the magnetic rotor causes eddy current fields to occur inside the non-ferrous metals which lead to throwing the non-ferrous metals from the belt.
  • the magnetic rotor With presently known eddy current separator units the magnetic rotor is mostly driven at a maximum rotational speed of 3000-3800 rpm inside the drum. This drum is made out of glass fibre. The conveyor belt is driven at a relative low speed of around 2,5 m/s.
  • the magnetic rotor can be positioned coaxially inside the outer drum. It is however preferred to position the magnetic rotor eccentrically inside the drum. See fig. 1. An air gap is present in between them, which air gap does not have a constant thickness seen in a radial direction, but instead narrows and widens in a circumferential direction because of the eccentric position of the magnetic rotor inside the drum.
  • a disadvantage of the eccentric type of eddy current separator units is that the assembly of magnetic rotor and drum may get overheated if the rotational speed of the magnetic rotor gets above a certain level. If the rotational speed of the magnetic rotor is increased, then with those eccentric type of eddy current separator units, disturbing air vortexes may start to occur between the quickly rotating magnetic rotor and the slowly rotating drum. This is caused by the fact that air is dragged along by the quickly rotating magnetic rotor, which air is forced to flow into the narrowing air gap between the drum and the magnetic rotor. Even if an inner circumferential wall of the drum and an outer
  • the present invention aims to at least partly overcome the abovementioned disadvantages or to provide a usable alternative.
  • the present invention aims to provide an eddy current separation unit with an increased efficiency because its magnetic rotor can be driven at higher rotational speeds without this causing all kinds of negative side effects due to a possible temperature build-up.
  • the unit comprises a drivable conveyor belt for supplying a stream of fractions, for example a stream of slags, in particular waste incineration slags, which contain non-ferrous metals.
  • the conveyor belt is guided over a rotatable outer drum.
  • the outer drum is rotatable around a first central axis. If the conveyor belt is driven to move in a conveying direction then the outer drum shall start to co-rotate along with it. It is also possible to drive the outer drum in rotation such that it is able to drive the conveyor belt.
  • a rotatable magnetic rotor is positioned inside the outer drum for the generation of eddy currents.
  • the magnetic rotor is positioned eccentrically inside the outer drum.
  • the magnetic rotor is rotatable around a second central axis.
  • the first and second central axes lie parallel at a distance of each other.
  • an inner drum is now provided coaxially around the magnetic rotor and thus also eccentrically within the outer drum.
  • the inner drum has a third central axis.
  • the second central axis and third central axis lie coaxial.
  • the inner drum comprises inner and outer circumferential walls with which it lies interspaced from inner and outer circumferential walls of both the inner and outer drums such that inner and outer gaps are obtained in between them.
  • the outer gap is present in between the eccentrically positioned inner and outer drums and has a varying thickness, that is to say that it converges towards a narrowing and from there widens again seen in a circumferential direction.
  • the inner gap is present in between the coaxially positioned magnetic rotor and inner drum and has a substantially constant thickness.
  • an aimed separation point can be obtained there where the assembly of magnetic rotor and inner drum lies closest relative to the outer drum.
  • the total distance between the magnetic rotor and the conveyor belt at the location of the aimed separation point (the sum of the inner gap, wall thickness of the inner drum, outer gap, wall thickness of the outer drum, and thickness of the conveyor belt) is the smallest, the magnetic fields may be the largest.
  • a substantially uniform and constant layer of cooling medium for example a layer of air
  • This layer of medium present inside the inner gap is able to smoothly and evenly rotate along with the magnetic rotor. A repeated compression of this medium no longer has to take place.
  • the medium inside the inner gap does not have to pass through a narrowing each time. The medium which is present inside the inner gap gets much less heated up.
  • a varying medium layer for example a layer of air
  • This layer of medium present inside the outer gap may still get dragged along somewhat because of the outer drum co-rotating with the belt. This medium still may get compressed inside the narrowing. This however does not have to lead to substantial temperature rises, as long as the speed of the conveyor belt and outer drum is kept low relative to the inner drum, which normally is the case.
  • the magnetic rotor can be driven at substantial higher rotational speeds compared to the state of the art. Top speeds of more than 4500 rpm, in particular more than 5000 rpm, and even more than 6000 rpm are deemed possible, in particular for industrial applicable high intensity eddy current separator units having widths of 800-1500 mm or more. This in turn will lead to an increase in efficiency. Higher rotational speeds, will increase the number of field changes per second of the eddy currents. This will highly increase the separation of fine cq small non-ferrous metals, in particular having sizes of less than 10 mm, more in particular having sizes of less than 8 mm.
  • the magnetic rotor preferably comprises the highest class of Neodymium magnets. Because of the high rotational speeds at which the magnetic rotor can be driven, those Neodymium magnets need to be reliably connected to a body of the rotor. This is crucial since otherwise outbreaks of heavy magnets may lead to serious accidents.
  • the magnets may be encapsulated in a resin or carbon while lying inside cavities which are provided in a core body of the rotor.
  • the resin or carbon layer for example can be a layer, which lies tight-fitted around substantially the entire circumference of the magnetic rotor and thus can help to prevent the magnets from breaking out of the magnetic rotor during its high rotational speeds. Preferably this layer then is pre-tensioned around the rotor, such that it is even able to withstand higher outbreak forces.
  • Neodymium magnets are of the highest temperature classification.
  • Those Neodymium magnets preferably comprise dysprosium in order to improve their performance and resistance to demagnetization. For example it may make them heat resistant up to 120°C without losing magnetism.
  • the inner drum rotatable, for example freely rotatable, such that it can start to co-rotate to a certain extent with the dragged along layers of medium inside the inner and outer gaps. It is also possible to drive the inner drum in rotation, for example in the same direction as the outer drum and conveyor belt respectively, such that the relative rotational speed between the inner drum and the outer drum can be minimized or even reduced to zero. In a preferred embodiment, however, the inner drum is mounted stationary such that it is unable to rotate around its central axis. This has the advantage that the mounting of the inner drum can be kept simple, and that no bearings or the like have to be provided for the inner drum.
  • the inner drum can be made and positioned such that a section of minimum wall thickness comes to lie in line with the aimed separation point.
  • the local varying wall thickness can for example be achieved by locally planing/flattening a substantially cylindrical inner drum.
  • the inner drum may have a (local) wall thickness, at least in front of the aimed separation point, of less than 2 mm, in particular less than 1 mm.
  • the inner drum can (locally in front of the aimed separation point) be constructed as thinly walled as possible. This is particularly
  • the inner drum mostly is made from glass fibre.
  • it may comprise an aramid fibre, in particular Kevlar. This makes it possible to make the inner drum even more thinly walled, because of the increased rigidity and strength of such materials.
  • the outer drum can also be made out of all kinds of materials like glass fibre.
  • the outer drum may comprise an aramid fibre, in particular Kevlar. Owing to this the outer drum then may have a wall thickness of less than 5 mm, in particular less than 4 mm.
  • the invention also relates to a method for operating the eddy current separator unit, and to a use of the eddy current separator unit for the extraction of non-ferrous metal containing fractions of slags, in particular residual slags of a waste incinerator plant.
  • Fig. 1 schematically shows an embodiment of an eddy current separator unit without an inner drum according to the state of the art
  • Fig. 2 schematically shows an embodiment of an eddy current separator unit with an inner drum according to the invention
  • Fig. 3 schematically shows a cross sectional view over the line Ill-Ill in fig. 2.
  • the magnetic rotor 1 comprises a substantially cylindrical rotor body with a number of Neodymium magnet pole bodies 3 connected thereto and divided around its circumference.
  • the rotor 1 has a central axis CA1 and is mounted rotatable inside bearings 5 of a frame 7.
  • a drive motor 8 is provided for driving the rotor 1 in rotation at rotational speeds of 4500 rpm or more.
  • the unit further comprises a substantially cylindrical inner drum 10.
  • This inner drum 10 has a central axis CA2 and is fixedly and non-rotatably mounted to the frame 7.
  • the rotor 1 and inner drum 10 are positioned substantially coaxially with each other, such that CA1 is substantially equal to CA2.
  • the rotor 1 has a substantially smooth outer circumferential wall with a radius R1.
  • the inner drum has a substantially smooth inner circumferential wall with a radius R2.
  • R1 is smaller than R2.
  • An inner gap 13 is thus present in between the rotor 1 and inner drum 10. This inner gap 13 has a substantially constant radial thickness and is filled with air.
  • the unit further comprises a substantially cylindrical outer drum 15.
  • This outer drum 15 has a central axis CA3 and is mounted rotatable inside bearings 16 of the frame 7.
  • the rotor 1 cq the inner drum 10 are positioned eccentrically relative to the outer drum 15, such that CA1/CA2 lie at a distance d of CA3.
  • the inner drum 10 has a substantially smooth outer circumferential wall with a radius R3.
  • the outer drum 15 has a substantially smooth inner circumferential wall with a radius R4.
  • R3 is smaller than R4.
  • An outer gap 18 is thus present in between the inner drum 10 and the outer drum 15.
  • This outer gap 18 is also filled with air and has a varying radial thickness and converges towards an aimed separation point 20 which lies on an imaginary line 21 running through the central axes CA1/CA2 and CA3.
  • An endless conveyor belt 24 (only partly shown) is guided over an outer
  • the outer circumferential wall of the outer drum 15 can be provided with some kind of profile such that the belt 24 gets more grip on it.
  • the conveyor belt 24 is driven at a relative low speed of
  • the magnetic rotor 1 and the conveyor belt 24 can be driven in co-rotation or in counter rotation.
  • the conveyor belt 24 feeds the stream of fine fractions along the aimed separation point 20.
  • the fast rotating magnetic rotor 1 causes eddy currents to occur inside the non-ferrous metal parts, which causes strong magnetic fields to occur.
  • the strong magnetic fields cause the non-ferrous metal parts to be launched out of the stream of fractions.
  • the dimensions, shapes and materials of the various parts/components can be varied.
  • air being present inside the inner and outer gaps
  • another medium like for example oil as a cooling medium.
  • the media inside the inner and outer gaps can be kept entirely separated from each other.
  • the invention provides a simple and effective construction for an eddy current separator unit to be operated at substantial higher rotational speeds in order to be able to improve the efficiency thereof without the temperature rising excessively.

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  • Sorting Of Articles (AREA)
  • Centrifugal Separators (AREA)

Abstract

L'invention concerne une unité de séparation à courant de Foucault comprenant une bande transporteuse pouvant être entraînée 24 pour l'alimentation d'un courant de fractions qui contiennent des métaux non ferreux, un tambour externe pouvant tourner 15 sur lequel la bande transporteuse 24 est guidée, et un rotor magnétique pouvant tourner 1 positionné à l'intérieur du tambour externe 15 pour la production de courants de Foucault. Le rotor magnétique 1 est positionné de manière excentrique à l'intérieur du tambour externe 15. Un tambour interne 10 est ménagé de manière coaxiale autour du rotor magnétique 1 et de manière excentrique au sein du tambour externe 15, de telle sorte qu'un écartement externe 18 avec une épaisseur variable est présent entre les tambours interne et externe 10, 15 positionnés de manière excentrique. Un écartement interne 13 avec une épaisseur sensiblement constante est fourni entre le rotor magnétique 1 et le tambour interne 10.
PCT/NL2014/050665 2013-09-30 2014-09-29 Unité de séparation à courant de foucault possédant un rotor magnétique positionné de manière excentrique à l'intérieur d'un tambour externe et de manière coaxiale à l'intérieur d'un tambour interne. Ceased WO2015047095A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL2011525 2013-09-30
NL2011525A NL2011525C2 (en) 2013-09-30 2013-09-30 Eddy current seperator unit having a magnetic rotor positioned eccentrically inside an outer drum and coaxially inside an inner drum.

Publications (1)

Publication Number Publication Date
WO2015047095A1 true WO2015047095A1 (fr) 2015-04-02

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NL2014/050665 Ceased WO2015047095A1 (fr) 2013-09-30 2014-09-29 Unité de séparation à courant de foucault possédant un rotor magnétique positionné de manière excentrique à l'intérieur d'un tambour externe et de manière coaxiale à l'intérieur d'un tambour interne.

Country Status (2)

Country Link
NL (1) NL2011525C2 (fr)
WO (1) WO2015047095A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106000637A (zh) * 2016-07-19 2016-10-12 湖北力帝机床股份有限公司 金属分选机
WO2021221504A1 (fr) * 2020-04-29 2021-11-04 Goudsmit Magnetic Systems B.V. Rouleau de déviation pour un séparateur de déchets ainsi qu'un séparateur de déchets muni dudit rouleau de déviation
KR20240012156A (ko) * 2022-07-20 2024-01-29 주식회사 대원지에스아이 와전류를 이용한 비철금속 선별장치

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0342330A2 (fr) * 1988-05-19 1989-11-23 Lindemann Maschinenfabrik GmbH Appareil de séparation de métaux non magnétiques d'un mélange de solides
US5092986A (en) 1988-04-25 1992-03-03 Steinert Elektromagnetbau Gmbh Magnetic separator
DE4031585A1 (de) * 1990-10-05 1992-04-09 Lindemann Maschfab Gmbh Vorrichtung zum abtrennen von nichtmagnetisierbaren stoffen aus einem gemisch
DE202012004227U1 (de) * 2012-04-30 2013-08-01 Imro Maschinenbau Gmbh Separationstrommel mit einer rotierenden exzentrischen Poltrommel im Inneren, wobei die Poltrommel mit Gruppen von Polstäben aus Magnetsegmenten unterschiedlicher Breite belegt ist, und Abscheider für Nichteisenmetall-Festkörper mit Separationstrommel

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5092986A (en) 1988-04-25 1992-03-03 Steinert Elektromagnetbau Gmbh Magnetic separator
EP0342330A2 (fr) * 1988-05-19 1989-11-23 Lindemann Maschinenfabrik GmbH Appareil de séparation de métaux non magnétiques d'un mélange de solides
DE4031585A1 (de) * 1990-10-05 1992-04-09 Lindemann Maschfab Gmbh Vorrichtung zum abtrennen von nichtmagnetisierbaren stoffen aus einem gemisch
DE202012004227U1 (de) * 2012-04-30 2013-08-01 Imro Maschinenbau Gmbh Separationstrommel mit einer rotierenden exzentrischen Poltrommel im Inneren, wobei die Poltrommel mit Gruppen von Polstäben aus Magnetsegmenten unterschiedlicher Breite belegt ist, und Abscheider für Nichteisenmetall-Festkörper mit Separationstrommel

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106000637A (zh) * 2016-07-19 2016-10-12 湖北力帝机床股份有限公司 金属分选机
WO2021221504A1 (fr) * 2020-04-29 2021-11-04 Goudsmit Magnetic Systems B.V. Rouleau de déviation pour un séparateur de déchets ainsi qu'un séparateur de déchets muni dudit rouleau de déviation
KR20240012156A (ko) * 2022-07-20 2024-01-29 주식회사 대원지에스아이 와전류를 이용한 비철금속 선별장치
KR102807139B1 (ko) 2022-07-20 2025-05-16 주식회사 대원지에스아이 와전류를 이용한 비철금속 선별장치

Also Published As

Publication number Publication date
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