EP1878505B1 - Process and device for the separation of fragments of liberated ferrous scrap from not liberated ferrous scrap fragments by means of a static magnet - Google Patents

Process and device for the separation of fragments of liberated ferrous scrap from not liberated ferrous scrap fragments by means of a static magnet Download PDF

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Publication number
EP1878505B1
EP1878505B1 EP06117130A EP06117130A EP1878505B1 EP 1878505 B1 EP1878505 B1 EP 1878505B1 EP 06117130 A EP06117130 A EP 06117130A EP 06117130 A EP06117130 A EP 06117130A EP 1878505 B1 EP1878505 B1 EP 1878505B1
Authority
EP
European Patent Office
Prior art keywords
magnet
liberated
scrap
magnetic field
fragments
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.)
Not-in-force
Application number
EP06117130A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP1878505A1 (en
Inventor
Peter Carlo Rem
Simon Peter Maria Berkhout
Otto Norbert Fraunholcz
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.)
Recycling Avenue
Technische Universiteit Delft
Original Assignee
Recycling Avenue
Technische Universiteit Delft
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
Priority to AT06117130T priority Critical patent/ATE471213T1/de
Priority to EP10155597A priority patent/EP2206558B1/en
Priority to AT10155597T priority patent/ATE533560T1/de
Priority to EP06117130A priority patent/EP1878505B1/en
Priority to ES06117130T priority patent/ES2346145T3/es
Application filed by Recycling Avenue, Technische Universiteit Delft filed Critical Recycling Avenue
Priority to DE602006014960T priority patent/DE602006014960D1/de
Priority to DK06117130.2T priority patent/DK1878505T3/da
Publication of EP1878505A1 publication Critical patent/EP1878505A1/en
Application granted granted Critical
Publication of EP1878505B1 publication Critical patent/EP1878505B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • B03C1/22—Magnetic separation acting directly on the substance being separated with material carriers in the form of belts with non-movable magnets

Definitions

  • the present invention relates to a process and device for the separation of fragments of liberated ferrous scrap from not liberated ferrous scrap fragments by means of a static magnet.
  • the present invention relates to the dramatic reduction of the copper content in liberated ferrous scrap in particular in steel scrap.
  • Steel scrap is produced, among others, from end-of-life consumer products, such as cars as well as electric and electronic appliances at car shredders and waste from energy plants.
  • liberated scrap means fragments which essentially do not contain materials other than iron and steel.
  • not liberated ferrous scrap refers to fragments containing other materials in particular copper.
  • ferrous scrap obtained from shedders contain both liberated and not liberated scrap. This "shredder steel scrap", obtained according to the prior art separation methods, is sold to steel manufacturers to be re-melted and processed into new steel products.
  • the threshold value of copper in steel scrap set by steelmakers has gone down from 0.25 wt-% to 0.2 wt-%.
  • the amount of copper containing parts in steel scrap has substantially risen, up to about 20 wt-%, as a result of design changes of durable consumer goods and passenger vehicles.
  • the liberated ferrous scrap fragments are separated from the not liberated ferrous scrap fragments by means of a static magnet wherein a mixture of said liberated ferrous and not liberated ferrous fragments is fed to a continuous conveyor belt which is driven around drums and wherein said magnet is fixed in the drum distant from the feeding point.
  • Said magnet is attracting liberated ferromagnetic material towards the belt as it passes around the drum, which device comprising a plurality of magnet poles extending around the interior of the drum for substantially 180°, wherein the uppermost pole being positioned at an angle of at least 15° to the vertical through the axis of the drum in the direction of belt travel.
  • the speed of the conveyor belt may not exceed 500 feet per minute (150m/s).
  • WO 88/05696 discloses a process for separating magnetic ore particles from non-magnetic particles using a short belt magnetic separator having a pulley head with axial pole permanent magnets located within said pulley head, said magnets being mounted in a fixed position within said pulley head during operation of said separator.
  • Said axial pole magnets within the pulley head are positioned so that said magnets extend along an arc beginning at a location spaced at least one degree beyond the point of tangency T of an upper surface of the belt with the pulley head.
  • US-A-3,057,477 relates to an apparatus for the sorting of tablets or pills which include a core of magnetically susceptible or paramagnetic material contained within an outer coating or shell. It is the object of US-A-3,057,477 to sort out pills having comprised therein a core of traceable small quantities of paramagnetic or magnetically susceptible material as opposed to pills without such a core.
  • US-A-3,057,477 employs a conveyor belt over which the pills are transported whereby at the end of the conveyor belt a magnetic field is applied which is established by placing electrical coils that are provided with pole pieces next to the belt and adjacent thereto. The resulting magnetic field lines follow therefore a path transverse to the conveying direction of the belt.
  • EP-A-0 455 948 shows a separating device for separating weakly magnetisable material from non-magnetisable material which is fed in a mixture at a feeding point to a continuous belt driven around drums for the transportation of the mixture to a separation zone.
  • magnetic field lines of a magnet are present, and the magnet to be employed therefore is required to be strong in order to attract the weakly magnetisable materials such as steel-qualities that are normally not magnetisable but may have become weakly magnetisable by mechanical agitation resulting in a transition of the steel-structure from austenite to martensite.
  • EP-A-0 455 948 is however not concerned with the separation of strongly magnetisable materials such as iron, nickel and nickel alloys.
  • the present invention relates to a process and device for the separation of liberated ferrous scrap fragments from not liberated ferrous scrap fragments by using a single dipole magnet rather than a plurality of magnets from the above discussed prior art, wherein said magnet is fixed in the drum distant from the feeding point, having magnetic field lines in the separation zone which are predominantly parallel to the belt surface.
  • the invention also relates to a device for the separation of fragments of liberated ferrous scrap from not liberated ferrous scrap in a separation zone, which device is provided with a first drum and a second drum and a continuous belt for the transportation of a mixture of liberated and not liberated scrap to the separation zone, wherein said magnet is a dipole magnet in the drum distant from the feeding point.
  • Said dipole magnet is cylindrical and furthermore the position of said magnet in the drum is such that the magnetic field lines are predominantly parallel to the surface of said belt.
  • the copper content of the feed is 1.5 wt-%.
  • the parallel orientation of the magnetic field line gives the best result relating to a copper content of the recovered steel fraction, i.e. only about 0,18 wt-% copper versus iron recovery of about 82.9 wt-%.
  • the copper content of the copper-rich fraction obtained by the centrifugal forces is about 8.0 wt-% versus about 17.1 wt-% iron recovery in the parallel orientation of the magnetic field lines.
  • the Figure shows the preferred embodiment of the device 1 of the invention for the separation of fragments of liberated ferrous scrap from not liberated ferrous scrap.
  • the liberated and not liberated scrap mixture is fed to the continuous conveyor belt 4 at drum 2 for the transportation of said scrap mixture with a belt speed of 2 to 5 m/s, preferably 3 to 4 m/s, and most preferably 3.5 m/s to the separation zone 6.
  • a belt speed of 2 to 5 m/s, preferably 3 to 4 m/s, and most preferably 3.5 m/s to the separation zone 6.
  • the magnetic field strength should be in balance with the speed of the conveyor belt.
  • the magnetic field strength is 0.10-0.15 Tesla at the belt surface at a belt speed of 3.5 m/s. At a lower belt speed the optimum magnetic field strength will be lower whereas at a higher speed the magnetic field strength should be higher than 0.10-0.15 Tesla.
  • the magnetic field strength is proportional to the belt speed.
  • the Figure further shows the separation zone 6 and some of the magnetic field lines 7.
  • the arrow 8 shows the belt travel direction.
  • the magnet preferably a dipole magnet, which is furthermore preferably a cylindrical magnet, 5 is fixed in the drum 3.
  • the capital letters N and S refer to north and south of the dipole magnet.
  • N is in the down and S is in the upper section, provided that the magnetic field lines are predominantly parallel to the surface of said belt.

Landscapes

  • Manufacture And Refinement Of Metals (AREA)
  • Processing Of Solid Wastes (AREA)
  • Combined Means For Separation Of Solids (AREA)
  • Water Treatment By Electricity Or Magnetism (AREA)
EP06117130A 2006-07-13 2006-07-13 Process and device for the separation of fragments of liberated ferrous scrap from not liberated ferrous scrap fragments by means of a static magnet Not-in-force EP1878505B1 (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
EP10155597A EP2206558B1 (en) 2006-07-13 2006-07-13 Process and device for the separation of fragments of liberated ferrous scrap from not liberated ferrous scrap fragments by means of a static magnet
AT10155597T ATE533560T1 (de) 2006-07-13 2006-07-13 Verfahren und gerät zur trennung von befreiten nicht eisenhaltigen metallteilchen von befreiten eisenhaltigen metallteilchen mittels eines statischen magneten
EP06117130A EP1878505B1 (en) 2006-07-13 2006-07-13 Process and device for the separation of fragments of liberated ferrous scrap from not liberated ferrous scrap fragments by means of a static magnet
ES06117130T ES2346145T3 (es) 2006-07-13 2006-07-13 Proceso y dispositivo para la separacion de fragmentos de residuos ferrosos liberados de fragmentos de residuos ferrosos no liberados mediante un iman estatico.
AT06117130T ATE471213T1 (de) 2006-07-13 2006-07-13 Verfahren und gerät zur trennung von befreiten nicht eisenhaltigen metallteilchen von befreiten eisenhaltigen metallteilchen mittels eines statischen magneten
DE602006014960T DE602006014960D1 (de) 2006-07-13 2006-07-13 Verfahren und Gerät zur Trennung von befreiten nicht eisenhaltigen Metallteilchen von befreiten eisenhaltigen Metallteilchen mittels eines statischen Magneten
DK06117130.2T DK1878505T3 (da) 2006-07-13 2006-07-13 Fremgangsmåde og indretning til separering af frigjorte jernholdige skrotfragmenter fra ikke-frigjorte jernholdige skrotfragmenter ved hjælp af en statisk magnet

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP06117130A EP1878505B1 (en) 2006-07-13 2006-07-13 Process and device for the separation of fragments of liberated ferrous scrap from not liberated ferrous scrap fragments by means of a static magnet

Related Child Applications (1)

Application Number Title Priority Date Filing Date
EP10155597.7 Division-Into 2010-03-05

Publications (2)

Publication Number Publication Date
EP1878505A1 EP1878505A1 (en) 2008-01-16
EP1878505B1 true EP1878505B1 (en) 2010-06-16

Family

ID=37460045

Family Applications (2)

Application Number Title Priority Date Filing Date
EP06117130A Not-in-force EP1878505B1 (en) 2006-07-13 2006-07-13 Process and device for the separation of fragments of liberated ferrous scrap from not liberated ferrous scrap fragments by means of a static magnet
EP10155597A Not-in-force EP2206558B1 (en) 2006-07-13 2006-07-13 Process and device for the separation of fragments of liberated ferrous scrap from not liberated ferrous scrap fragments by means of a static magnet

Family Applications After (1)

Application Number Title Priority Date Filing Date
EP10155597A Not-in-force EP2206558B1 (en) 2006-07-13 2006-07-13 Process and device for the separation of fragments of liberated ferrous scrap from not liberated ferrous scrap fragments by means of a static magnet

Country Status (5)

Country Link
EP (2) EP1878505B1 (es)
AT (2) ATE471213T1 (es)
DE (1) DE602006014960D1 (es)
DK (1) DK1878505T3 (es)
ES (1) ES2346145T3 (es)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106238205A (zh) * 2016-08-09 2016-12-21 宿州市威菱耐火材料有限责任公司 一种磁选机

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL2001322C2 (nl) 2008-02-27 2009-08-31 Univ Delft Tech Werkwijze en inrichting voor het scheiden van vaste deeltjes met een onderling dichtheidsverschil.
WO2010090517A1 (en) 2009-02-03 2010-08-12 Monsanto Holland B.V. Enriching the seed quality of a batch of seeds
NL2002730C2 (en) 2009-04-08 2010-10-11 Univ Delft Tech Method and apparatus for separating a non-ferous metal-comprising fraction from ferrous scrap.
NL2002736C2 (en) 2009-04-09 2010-10-12 Univ Delft Tech Method for separating magnetic pieces of material.

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2690263A (en) * 1950-05-12 1954-09-28 Electromagnets Ltd Magnetic separator
DE1051752B (de) * 1957-05-27 1959-03-05 Gerd Rayhrer Dr Ing Magnetischer Ausscheider von Eisenteilen aus einem Gutstrom
FR1225338A (fr) 1961-10-24 1960-06-30 Procédé et dispositif de triage
GB1602279A (en) 1978-05-23 1981-11-11 British Steel Corp Magnetic separation
US4781821A (en) 1987-01-30 1988-11-01 Usx Corporation Process for operating a short-belt type magnetic separator
DE4014969A1 (de) 1990-05-10 1991-11-14 Lindemann Maschfab Gmbh Verfahren und vorrichtung zum abtrennen insbesondere schwachmagnetisierbarer materialien aus einem feststoffgemisch

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106238205A (zh) * 2016-08-09 2016-12-21 宿州市威菱耐火材料有限责任公司 一种磁选机

Also Published As

Publication number Publication date
EP2206558A1 (en) 2010-07-14
EP1878505A1 (en) 2008-01-16
ES2346145T3 (es) 2010-10-11
ATE533560T1 (de) 2011-12-15
DK1878505T3 (da) 2010-09-27
ATE471213T1 (de) 2010-07-15
DE602006014960D1 (de) 2010-07-29
EP2206558B1 (en) 2011-11-16

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