EP0484309A2 - Verfahren und Vorrichtung zur Trennung körniger Materialen - Google Patents

Verfahren und Vorrichtung zur Trennung körniger Materialen Download PDF

Info

Publication number
EP0484309A2
EP0484309A2 EP91850268A EP91850268A EP0484309A2 EP 0484309 A2 EP0484309 A2 EP 0484309A2 EP 91850268 A EP91850268 A EP 91850268A EP 91850268 A EP91850268 A EP 91850268A EP 0484309 A2 EP0484309 A2 EP 0484309A2
Authority
EP
European Patent Office
Prior art keywords
space
separation
particles
magnetic field
throwing
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
EP91850268A
Other languages
English (en)
French (fr)
Other versions
EP0484309A3 (en
Inventor
Per-Arne Svensson
Björn Madsen
Göran Forslund
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.)
SCANDINAVIAN RECYCLING AB
Original Assignee
SCANDINAVIAN RECYCLING AB
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 SCANDINAVIAN RECYCLING AB filed Critical SCANDINAVIAN RECYCLING AB
Publication of EP0484309A2 publication Critical patent/EP0484309A2/de
Publication of EP0484309A3 publication Critical patent/EP0484309A3/en
Ceased legal-status Critical Current

Links

Images

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

Definitions

  • the present invention generally relates to dry separation of particles, and in particular to a method and a device for separating at least one particulate, electrically conductive, non-magnetic material included as a constituent or as constituents in a mixture.
  • EP-0,307,250 A2 describes a method for separating a mixture of flat metal alloy particles. This separation method relies on differences in particle size and differences in electrical conductivity or density.
  • This publication states, by way of example, the use of a vibrating separator table together with a rapidly alternating magnetic field which in electrically conductive particles applied to the table induces eddy currents causing the particles to be deflected to a varying extent. The magnetic field is provided underneath the particles (cf. Fig. 3).
  • the prior-art separation techniques described above provide a degree of separation which is insufficient in many applications, and suffer from a number of drawbacks.
  • the major drawback, especially reflected in the above-mentioned European patent publication where the magnetic field is located below the particles, is that the greatest magnetic force (magnetic flux density) is on the underside of the particles, this bringing about a rotational direction of the electrically conductive particles that is oppositely directed to the desired transport direction or direction of separation, which adversely affects the separation.
  • the present invention overcomes the drawbacks of prior-art separation techniques, and one object thereof is to provide such a high degree of separation that the separated products, without further processing or purification, can be used as raw materials in refining processes with high demands on the purity of the raw materials.
  • the electrically conductive, non-magnetic particles By subjecting, in accordance with the invention, the electrically conductive, non-magnetic particles to a rotating, alternating magnetic field inducing electric eddy currents in the particles while these are being repeatedly thrown up into the field in a direction opposite to the direction of rotation of the magnets generating the magnetic field, at a throwing angle ⁇ relative to the horizontal plane, where 0 ⁇ ⁇ ⁇ 90°, and by arranging the rotary means above the particles, a very high degree of separation of about 98% or more is achieved.
  • the invention thus relates to a method and a device for separating at least one particulate, electrically conductive, non-magnetic material included as a constituent or as constituents in a mixture, as recited in the preambles of the respective independent claims, the method and the device having the features appearing from the characterising clauses of the respective independent claims.
  • the device shown in Fig. 1 has a feeding unit 1 including a rotary disc 1a for supplying particles to a separation means 2 having a cover 3 and a bottom 4.
  • the cover 3 has a central opening in which the feeding unit 1 opens.
  • the separation means is closed, with the exception of the central opening and slots provided at the periphery of the separation means.
  • the separation means 2 is sloping downwards, counting from the centre, which implies a movement of the particles towards the periphery of the separation means.
  • the device includes a means 5 for generating a magnetic field.
  • the means 5 has an upper hood 6, whose inside is equipped with a plurality of magnets (not shown).
  • the separation means 2 is disposed underneath the means 5.
  • the hood 6 is rotated by means of a motor 8 (via a transmission 9).
  • the separation means 2 is of plastic, its cover and bottom having a thickness of about 2-5 mm.
  • An apparatus 11 is adapted to throw up the particles into the magnetic field.
  • the throwing apparatus 11, illustrated only schematically, is of conventional type and comprises, according to a preferred embodiment, a box-like structure whose top face forms the bottom 4 of the separation means 2.
  • the box-like structure being suspended on leaf springs, is set in motion, more specifically in a combined rotary/throwing motion (restrained by the leaf springs) which can be defined as a helical motion, such that the particles are repeatedly thrown up into the magnetic field, i.e. each particle impinges on the bottom several times.
  • This motion can be achieved by means of a piston and cylinder assembly, an eccentric mechanism or the like.
  • the throwing apparatus 11 is so designed that the particles are thrown up into the magnetic field in a direction opposite to the direction of rotation of the hood 6.
  • the throwing height and the throwing angle are dependent on the particle material, particle type and particle size. Generally, however, the throwing height varies from a few millimetres to several centimetres, and the throwing angle relative to the horizontal plane is greater than zero and less than 90°.
  • Fig. 2 illustrates another preferred embodiment in which two magnetic fields are provided, namely a first (represented by the hood 6 internally equipped with magnets) which is disposed above the separation means 2, and a second (represented by the hood 7 internally equipped with magnets) which is disposed below the separation means 2.
  • the hood 7 is driven by a motor 8 (via a transmission 9), the hood 6 being entrained in the rotary movement as a result of the magnetic coupling between the hoods.
  • This embodiment is best suited for separating particles of a relatively small particle size, e.g. 1-2 mm, whereas the embodiment in Fig. 1 is best suited for separating particles of a larger particle size, e.g. 2-10 mm.
  • the purpose of arranging a lower magnetic field combined with the upper one merely is to intensify the magnetic field.
  • Fig. 3 illustrates the separation means 2 in more detail.
  • the cover 3 (broken apart in Fig. 3) and the bottom 4 are interconnected by radial webs 12 dividing the separation means into sections 13.
  • Deflecting members in the form of flanges 14 vertically projecting from the bottom extend partially along imaginary centre radii in each section 13.
  • each section 13 is divided into two chambers 15, 16.
  • collecting means (not shown) in the form of pockets, one for each chamber, from which tubes extend, opening into two large-size containers, namely one container for the tubes coming from the chambers 15 of the sections 13, and another for the tubes coming from the chambers 16 of the sections 13.
  • each section may of course be divided into more than two chambers.
  • an optional number of tubes can be arranged which open into an optional number of large-size containers.
  • Fig. 4C shows how individual particles behave in the magnetic field.
  • magnets which are rotated in order to induce eddy currents in the electrically conductive particles, the direction of rotation being indicated by the arrow A.
  • Below the magnets there is an air gap and under it a plastic element forming the cover of the separation space provided thereunder and further defined by the bottom.
  • the feeding unit randomly distributes the particles into the different sections 13 of the separation means 2.
  • the slope of the separation means 2 implicates a displacement of the particles towards the periphery thereof.
  • a suitable size of the particles included in the mixture is 1-10 mm, preferably 1-8 mm.
  • speed of rotation There is a certain relationship between the speed of rotation and the particle size.
  • small particles require rotational speeds in the upper region of the range, whereas larger particles require rotational speeds in the lower region of the range.
  • Optimal ratios are obtainable by simple tests.
  • the shape of the particles is not critical in the invention. However, it is preferred to use substantially granular particles, which means particles of a shape varying from spherical to polygonal.
  • Non-restricting examples of mixtures which have been successfully separated according to the invention are mixtures containing at least one of the following constituents: copper, lead, glass, plastic, cellulose etc.
  • a condition for a successful separation according to the invention is that the mixture contains at least one electrically conductive, non-magnetic material.

Landscapes

  • Electrostatic Separation (AREA)
EP19910850268 1990-11-01 1991-10-31 Method and device for separating particulate matter Ceased EP0484309A3 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9003485A SE468078B (sv) 1990-11-01 1990-11-01 Anordning foer torrseparering av granuler
SE9003485 1990-11-01

Publications (2)

Publication Number Publication Date
EP0484309A2 true EP0484309A2 (de) 1992-05-06
EP0484309A3 EP0484309A3 (en) 1992-08-12

Family

ID=20380790

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910850268 Ceased EP0484309A3 (en) 1990-11-01 1991-10-31 Method and device for separating particulate matter

Country Status (2)

Country Link
EP (1) EP0484309A3 (de)
SE (1) SE468078B (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1003325C2 (nl) * 1996-06-12 1997-12-17 Tno Inrichting voor het door middel van wervelstromen (Eddy-currents) uit een deeltjesstroom afscheiden van non-ferrometalen c.q. het op samenstelling, grootte, vorm of dichtheid van elkaar scheiden van deeltjes uit non-ferrometaal.
WO2007117204A1 (en) * 2006-04-11 2007-10-18 Mattssonföretagen I Uddevalla Aktiebolag Wire-wound engraving roller and method of manufacturing the same

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2129002A1 (de) * 1970-06-15 1971-12-23 Univ Vanderbilt Verfahren und Vorrichtung zur Trennung von Teilchen mit unterschiedlichen elektrischen Leitfähigkeiten
JPS54122466A (en) * 1978-03-16 1979-09-22 Shinko Electric Co Ltd Linear motor type nonmagnetic metal selector
US4313543A (en) * 1979-09-04 1982-02-02 Raytheon Company Multi-size materials separator
ZA886696B (en) * 1987-09-11 1989-04-26 Alcan Int Ltd Method of separating metal alloy particles

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1003325C2 (nl) * 1996-06-12 1997-12-17 Tno Inrichting voor het door middel van wervelstromen (Eddy-currents) uit een deeltjesstroom afscheiden van non-ferrometalen c.q. het op samenstelling, grootte, vorm of dichtheid van elkaar scheiden van deeltjes uit non-ferrometaal.
EP0812624A1 (de) * 1996-06-12 1997-12-17 Nederlandse Organisatie Voor Toegepast-Natuurwetenschappelijk Onderzoek Tno Wirbelstrom-Abscheider
WO2007117204A1 (en) * 2006-04-11 2007-10-18 Mattssonföretagen I Uddevalla Aktiebolag Wire-wound engraving roller and method of manufacturing the same
CN101443129B (zh) * 2006-04-11 2012-02-08 马特森乌德瓦拉有限责任公司 金属丝缠绕雕刻辊及其制造方法

Also Published As

Publication number Publication date
SE9003485L (sv) 1992-05-02
SE9003485D0 (sv) 1990-11-01
SE468078B (sv) 1992-11-02
EP0484309A3 (en) 1992-08-12

Similar Documents

Publication Publication Date Title
CA2496381C (en) Grid type electrostatic separator/collector and method of using same
US4046679A (en) Magnetic drum materials separator
US4137156A (en) Separation of non-magnetic conductive metals
US5060871A (en) Method of separating metal alloy particles
US4106627A (en) Method and apparatus for use in separation and recovery of non-magnetic metal pieces
JP4366513B2 (ja) 金属複合廃材からの有価金属の回収方法および装置
WO2003084667A1 (en) High-tension electrostatic classifier and separator, and associated method
JPS5951878B2 (ja) 磁力によるかん選別機
CA1185566A (en) Separation of particulate materials using an alternating potential electrostatic field
US4238323A (en) Method of and apparatus for electrodynamic separation of nonmagnetic free-flowing materials
EP0484309A2 (de) Verfahren und Vorrichtung zur Trennung körniger Materialen
US4172030A (en) Non-magnetic metal selecting method and apparatus
SU1736610A1 (ru) Магнитно-винтовой сепаратор
US2188516A (en) Apparatus for magnetic separation
US5161695A (en) Method and apparatus for separating particulate material according to conductivity
EP0812624A1 (de) Wirbelstrom-Abscheider
US4070278A (en) Magnetic segregation of mixed non-ferrous solid materials in refuse
DE19737161A1 (de) Verfahren, Anlage und Vorrichtungen zum trockenen Abtrennen von Metallen aus zerkleinerten Schüttgütern, insbesondere Schrottgemischen
US4248700A (en) Transit materials separator
GB2153707A (en) Electromagnetic rotary separator
Kercher et al. Scrap processing by eddy current separation techniques
SU904783A1 (ru) Электромагнитный сепаратор
EP0182892B1 (de) Verfahren und vorrichtung zur trennung von metallteilchen
US5522513A (en) Separator disc
CA1063552A (en) Translating magnetic fields in non-magnetic conductive metals separation system

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): AT BE CH DE DK ES FR GB GR IT LI LU NL SE

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): AT BE CH DE DK ES FR GB GR IT LI LU NL SE

K1C3 Correction of patent application (complete document) published

Effective date: 19920506

17P Request for examination filed

Effective date: 19930112

17Q First examination report despatched

Effective date: 19931124

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN REFUSED

18R Application refused

Effective date: 19950130