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WO1998029190A1 - Separation de poudres - Google Patents

Separation de poudres Download PDF

Info

Publication number
WO1998029190A1
WO1998029190A1 PCT/GB1998/000019 GB9800019W WO9829190A1 WO 1998029190 A1 WO1998029190 A1 WO 1998029190A1 GB 9800019 W GB9800019 W GB 9800019W WO 9829190 A1 WO9829190 A1 WO 9829190A1
Authority
WO
WIPO (PCT)
Prior art keywords
magnet assembly
drum
assembly
powder
ferromagnetic
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/GB1998/000019
Other languages
English (en)
Inventor
Stephen Fawell
Paul Genner
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.)
ERIEZ MAGNETICS EUROPE Ltd
Original Assignee
ERIEZ MAGNETICS EUROPE Ltd
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 ERIEZ MAGNETICS EUROPE Ltd filed Critical ERIEZ MAGNETICS EUROPE Ltd
Priority to AU53351/98A priority Critical patent/AU5335198A/en
Publication of WO1998029190A1 publication Critical patent/WO1998029190A1/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
    • B03C1/16—Magnetic separation acting directly on the substance being separated with material carriers in the form of belts
    • B03C1/18—Magnetic separation acting directly on the substance being separated with material carriers in the form of belts with magnets moving during operation
    • 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
    • B03C1/10—Magnetic separation acting directly on the substance being separated with cylindrical material carriers
    • B03C1/12—Magnetic separation acting directly on the substance being separated with cylindrical material carriers with magnets moving during operation; with movable pole pieces
    • 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

Definitions

  • the present invention relates to a method of separating a mixture of ferromagnetic and non-ferromagnetic powders into their components.
  • a number of methods have been used hitherto to separate the ferromagnetic (typically iron or steel) powder from the non-ferromagnetic powder being manufactured or processed.
  • One such method uses a grating formed of a plurality of elongate magnet assemblies mounted parallel to each other and spaced apart horizontally: the powder mixture is poured through this grating, the ferromagnetic powder adhering to the magnet assemblies and the non-ferromagnetic material falling through; the separator typically comprises several such gratings mounted one-above-the-other and deflectors are provided to deflect the falling powder mixture to flow over the individual magnet assemblies.
  • Another known method uses a matrix through which the powder mixture is poured, the matrix being encircled by an electromagnet coil and vibrated by a vibratory drive.
  • the flux produced by the electromagnet is concentrated by the matrix, to cause the ferromagnetic powder to be captured by the matrix.
  • a further known powder separation method uses a horizontally-mounted drum over which the powder mixture is poured.
  • the drum encloses a permanent magnet: the non- ferromagnetic powder flows over the surface of the drum for part of its circumference and then drops vertically, whilst the ferromagnetic powder is attracted towards the permanent magnet and is held to the surface of the drum for a greater proportion of its circumference before dropping.
  • separators are of limited effectiveness.
  • a particular problem is that a ferromagnetic particle may be surrounded by non-ferromagnetic particles, such that if the magnetic field of the apparatus is insufficiently strong to retain the overall clump of particles, the whole is passed as if it were non-ferromagnetic.
  • the first two of these separators require additional steps to remove the ferromagnetic powder from the grating or matrix to which it becomes adhered.
  • a method of separating a mixture of powders of ferromagnetic and non-ferromagnetic materials comprising providing a cylindrical magnet assembly which is mounted with its axis horizontal and comprises a plurality of magnets disposed one-after-another around the circumference of said assembly, adjacent said magnets presenting alternate poles radially outwards, rotating said cylindrical magnet assembly around its axis, providing a curved surface which is concentric with said cylindrical magnet assembly and extends at least over an arc of 90° from a point vertically above said axis to a point horizontally aligned with said axis, and causing said powder mixture to move onto said curved surface at its upper region and then move downwardly in a path which follows said surface.
  • the non-ferromagnetic powder falls more or less vertically downwards when it reaches the point of the curved surface which is horizontally aligned with the axis of the rotating cylindrical magnet assembly.
  • the ferromagnetic powder is attracted radially inwards by the magnets, and does not drop from the curved surface until it has travelled to a lower angular position.
  • the non-ferromagnetic and ferromagnetic powders can therefore be collected in separate outlets.
  • the curved surface may comprise a fixed surface onto which the mixed powder is poured, and over which the mixed powder then slides.
  • the curved surface comprises a drum which is coaxial with the cylindrical magnet assembly, and is rotated in the direction of required movement of the powder.
  • an endless belt may be trained over a drum and a roller spaced from that drum, the drum being coaxial with the cylindrical magnet assembly: the mixed powder is then poured onto the upper run of the belt, and is then conveyed up to and around the drum.
  • this method is very effective in separating mixtures of ferromagnetic and non-ferromagnetic powders of less than 250 micron (and particularly less than 100 micron) particle size.
  • the method is particularly effective in breaking up "clumps" of mixed powders: we believe that this is because, in moving in the curved path coaxial with the cylindrical magnet assembly, the powder is strongly agitated due to the rapidly changing magnetic field to which it is subjected; thus, as the magnet assembly rotates, the magnetic field at each point reverses alternately as the successive permanent magnets pass that point.
  • the cylindrical magnet assembly is rotated in the opposite direction to the movement of the powder.
  • the rotation of the cylindrical magnet assembly produces 500 to 50,000 pole changes per minute.
  • an assembly having 22 magnets disposed one-after- another around its circumference and rotating at 1500 r.p. . produces 33,000 pole changes per minute.
  • the magnet assembly produces 22,000 to 44,000 pole changes per minute.
  • magnet assembly of 22 magnets and 12 inch diameter.
  • magnet assembly of 10 magnets and 5 inch diameter.
  • the magnet assembly may be of any desired diameter and number of magnets.
  • the method is intended for use with dry powder but may also be used where the powder is damp.
  • one of the component powders separated by the rotating magnet assembly is guided to a second rotating magnet assembly, which performs a second stage of separation.
  • one or more further rotating magnet assemblies may be provided to perform further stages of separation.
  • FIGURE 1 is a diagrammatic side view of one embodiment of separation for use in carrying out a method in accordance with the invention.
  • FIGURE 2 is a diagrammatic plan view of the separator of Figure 1.
  • a powder separator apparatus which comprises an endless belt 10 trained around a rotatable drum 12 and a roller 14 which are mounted with their axes parallel to each other and horizontally spaced- apart.
  • An electric motor 13 is provided to drive the roller 14 and hence the belt 10 in the direction shown by the arrow A.
  • a magnet assembly drum 16 which comprises a plurality of permanent magnets positioned one-after-another around the circumference of the drum, with adjacent magnets presenting alternate poles (N,S) to the outer surface of the drum.
  • An electric motor 17 is provided for rotating the magnet assembly drum 16 in the direction indicated by the arrow B.
  • the direction of rotation of the magnet assembly drum 16 is opposite the direction of rotation of the drum 12.
  • the drum 12 and belt 10 are of plastics or other non-metal material and the spacing between the outer surface of drum 16 and the inner surface of drum 12 is as small as possible.
  • the apparatus further comprises a feed hopper 18 for holding the mixture of powder to be separated.
  • a mechanical agitator 19 is provided for the hopper so that powder in this feed hopper falls onto the belt 10 and is thus conveyed to the drum 12 and then around the circumference of the drum.
  • Non- ferromagnetic powder falls vertically, generally tangentially of the drum 12.
  • Ferromagnetic powder is retained on the belt 10 for a greater proportion of the drum circumference, being attracted to it by the permanent magnets of the magnetic drum assembly 16.
  • the ferromagnetic powder falls from the belt 10, but at a point or zone spaced somewhat from the point or zone at which the non-ferromagnetic powder falls.
  • the ferromagnetic and non-ferromagnetic powders thus fall into separate outlet ducts 20,22.
  • the apparatus further comprises an enclosure or housing
  • an outlet 26 is provided for connection to an extraction fan, for withdrawing air which may be laden with some of the powder.
  • the method may be used to separate out ferromagnetic powder from non-ferromagnetic powder, but may equally well be used to separate out non- ferromagnetic powder from ferromagnetic powder.
  • the apparatus may include a second rotating magnet assembly and feed belt, onto which the separated material (either 20 or 22) falls.

Landscapes

  • Manufacturing Cores, Coils, And Magnets (AREA)

Abstract

L'invention concerne un procédé de séparation d'un mélange de poudres ferromagnétiques et non ferromagnétiques; dans le procédé selon l'invention, le mélange de poudres est disposé dans une surface de forme courbe s'étendant au-dessus d'un ensemble (16) magnétique cylindrique en rotation, comprenant plusieurs aimants disposés l'un derrière l'autre autour de la circonférence de l'ensemble, les aimants contigus présentant des pôles alternés radialement vers l'extérieur. Le mélange de poudres peut être versé sur une bande (10) transporteuse disposée autour d'un tambour (12) dont l'axe est occupé par l'ensemble (16): la bande (10) transporte le mélange de poudres autour de la partie supérieure de l'ensemble (16), où il est séparé en différents composants (20, 22).
PCT/GB1998/000019 1997-01-03 1998-01-05 Separation de poudres Ceased WO1998029190A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU53351/98A AU5335198A (en) 1997-01-03 1998-01-05 Powder separation

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB9700081.4A GB9700081D0 (en) 1997-01-03 1997-01-03 Power separation
GB9700081.4 1997-01-03

Publications (1)

Publication Number Publication Date
WO1998029190A1 true WO1998029190A1 (fr) 1998-07-09

Family

ID=10805530

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1998/000019 Ceased WO1998029190A1 (fr) 1997-01-03 1998-01-05 Separation de poudres

Country Status (3)

Country Link
AU (1) AU5335198A (fr)
GB (1) GB9700081D0 (fr)
WO (1) WO1998029190A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2182716A1 (es) * 2001-07-25 2003-03-01 Bagur Virginia Campins Separador magnetico de cuerpos metalicos no ferromagneticos.
CN101590445B (zh) * 2009-05-27 2011-12-21 镇江市江南矿山机电设备有限公司 交叉带式永磁磁选机
WO2012093389A1 (fr) * 2010-12-08 2012-07-12 P.M.S.R. Technologies Ltd. Appareil et procédé de séparation magnétique

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2939580A (en) * 1957-05-27 1960-06-07 Carpenter James Hall Magnetic ore separator
EP0106675A2 (fr) * 1982-10-13 1984-04-25 Edward L. Bateman Limited Séparation magnétique
EP0342330A2 (fr) * 1988-05-19 1989-11-23 Lindemann Maschinenfabrik GmbH Appareil de séparation de métaux non magnétiques d'un mélange de solides
EP0439983A2 (fr) * 1990-01-29 1991-08-07 ETS G. ANDRIN ET FILS (Société Anonyme) Séparateur magnétique de particules et morceaux en métal non-ferreux

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2939580A (en) * 1957-05-27 1960-06-07 Carpenter James Hall Magnetic ore separator
EP0106675A2 (fr) * 1982-10-13 1984-04-25 Edward L. Bateman Limited Séparation magnétique
EP0342330A2 (fr) * 1988-05-19 1989-11-23 Lindemann Maschinenfabrik GmbH Appareil de séparation de métaux non magnétiques d'un mélange de solides
EP0439983A2 (fr) * 1990-01-29 1991-08-07 ETS G. ANDRIN ET FILS (Société Anonyme) Séparateur magnétique de particules et morceaux en métal non-ferreux

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2182716A1 (es) * 2001-07-25 2003-03-01 Bagur Virginia Campins Separador magnetico de cuerpos metalicos no ferromagneticos.
ES2182716B1 (es) * 2001-07-25 2004-06-01 Virginia Campins Bagur Separador magnetico de cuerpos metalicos no ferromagneticos.
CN101590445B (zh) * 2009-05-27 2011-12-21 镇江市江南矿山机电设备有限公司 交叉带式永磁磁选机
WO2012093389A1 (fr) * 2010-12-08 2012-07-12 P.M.S.R. Technologies Ltd. Appareil et procédé de séparation magnétique
US9010538B2 (en) 2010-12-08 2015-04-21 Smolkin Raphael Apparatus and method for magnetic separation

Also Published As

Publication number Publication date
AU5335198A (en) 1998-07-31
GB9700081D0 (en) 1997-02-19

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