DE102007010130B4 - Method and arrangement for separating magnetic particles from a substance - Google Patents

Method and arrangement for separating magnetic particles from a substance

Info

Publication number
DE102007010130B4
DE102007010130B4 DE102007010130A DE102007010130A DE102007010130B4 DE 102007010130 B4 DE102007010130 B4 DE 102007010130B4 DE 102007010130 A DE102007010130 A DE 102007010130A DE 102007010130 A DE102007010130 A DE 102007010130A DE 102007010130 B4 DE102007010130 B4 DE 102007010130B4
Authority
DE
Germany
Prior art keywords
characterized
magnetic
arrangement according
substance
magnetizable
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.)
Expired - Fee Related
Application number
DE102007010130A
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German (de)
Other versions
DE102007010130A1 (en
Inventor
Manfred Dr. Rührig
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.)
Siemens AG
Original Assignee
Siemens AG
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 Siemens AG filed Critical Siemens AG
Priority to DE102007010130A priority Critical patent/DE102007010130B4/en
Publication of DE102007010130A1 publication Critical patent/DE102007010130A1/en
Application granted granted Critical
Publication of DE102007010130B4 publication Critical patent/DE102007010130B4/en
Expired - Fee Related legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION 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
    • B03CMAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C1/00Magnetic separation
    • B03C1/02Magnetic separation acting directly on the substance being separated
    • B03C1/16Magnetic separation acting directly on the substance being separated with material carriers in the form of belts
    • B03C1/22Magnetic separation acting directly on the substance being separated with material carriers in the form of belts with non-movable magnets
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION 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
    • B03CMAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C1/00Magnetic separation
    • B03C1/02Magnetic separation acting directly on the substance being separated
    • B03C1/025High gradient magnetic separators
    • B03C1/031Component parts; Auxiliary operations
    • B03C1/033Component parts; Auxiliary operations characterised by the magnetic circuit
    • B03C1/0332Component parts; Auxiliary operations characterised by the magnetic circuit using permanent magnets

Abstract

Process for the magnetic separation of magnetic or magnetizable particles from a substance, in particular for the purification of liquid mixtures containing magnetic particles, such as suspensions, sludges or the like, with the following process steps:
The substance, in particular the liquid mixture, is brought into contact with solid materials which are magnetically or magnetisable or nonmagnetic or nonmagnetic in some areas,
- In the section of the magnetizable material are continuously removed from the substance to be purified, the magnetic components.

Description

  • The The invention relates to a method for magnetic separation of magnetic particles from a substance, in particular for purification magnetic mixtures containing magnetic particles, such as suspensions, whitewash or the like. In addition, the invention also relates to associated arrangement to carry out the Process.
  • magnetic Separators are used to process magnetic processes in industrial processes To separate components from non-magnetic. It can be about undesirable Impurities, e.g. As iron in aluminum scrap in aluminum recycling, unwanted iron components in wood processing or waste tire processing, or specifically for a specific recycling or recycling of magnetic Ingredients, eg. As structural steel in concrete recycling, act.
  • typically, Such a separator consists of a device with the strong Magnetic field gradients are generated. There are both electromagnets as well as permanent magnets used. The latter have the advantage, none need your own energy supply. In a magnetic field gradient, a force is applied to a magnetic body applied the magnetization of the body and proportional to the gradient of the magnetic field. Magnetically, bodies can either be that they carry their own magnetic moment, or by an external magnetic field, z. B. that of the gradient field, magnetized become.
  • outgoing From the above prior art, it is an object of the invention to provide an improved Process for the separation of magnetic or magnetizable Specify particles and create an associated arrangement.
  • Regarding the The method is according to the invention by the measures of claim 1. In terms of the associated Arrangement is the object by the features of claim 7 solved. Further developments of the method and the associated arrangement are in the dependent claims specified.
  • object The invention relates to a method for the magnetic separation of magnetic particles of a substance in which the substance is in contact with solid materials that are partially magnetic or magnetizable or non-magnetic or nonmagnetizable, is brought and in the sections of the magnetizable material from the to be cleaned Substance continuously removed the magnetic components become.
  • Preferably takes place with the method according to the invention a purification of mixtures containing magnetic particles with fluidic Consistency, such as suspensions, sludges or the like, where in this case, let the individual process steps be carried out easily. In particular, the magnetizable areas move relatively to the substance to be purified in the opposite direction, d. H. it will realized a countercurrent principle. It is advantageously the magnetizable material alternately in a first step a first field magnetized and in a second step by demagnetized a second field. In addition, even more extensive gradient fields used to make more particles that are not more immediate Near the magnetizable material, tighten.
  • at an arrangement for carrying out the method according to the invention it is proposed a continuously moving endless Tape at least partially made of magnetizable sections To train material over which material the substances to be cleaned or separated guided be, each continuously from the substances, the magnetic Components are removed.
  • In the arrangement according to the invention, in particular the following advantageous properties are realized:
    • The strip material is preferably an iron (Fe) base alloy, typically an iron / chromium (FeCr) alloy with further constituents. As a material thus comes into consideration stainless steel, for example, due to mechanical processing, typically a cold deformation, for. Roll, is in a crystal structure that is magnetic. In the case of stainless steel, this is usually the martensitic phase, which is formed or reinforced by cold deformation (so-called hardening martensite). Advantageously, this stainless steel strip is locally modified so that it loses its magnetizability, ie non-magnetic or paramagnetic. As a modification according to the invention is a local heating by electromagnetic radiation (laser, infrared heater), by an inductive heating or by direct contact with a heating element into consideration. With suitable process control, the martensitic phase can be transformed into the austenitic phase, with the martensitic phase being characterized in particular by another crystal structure, namely a cubic structure. In connection with the invention it is essential that the conversion phase is non-magnetic, ie not magnetizable.
    • - Next is a magnetization device seen that imprints the conveyor belt a remanent magnetization, z. B. an electromagnet or a permanent magnet over which the tape is guided.
    • By a partial heat treatment of the material results in a local variation of the magnetization of the material and thus a magnetization gradient which in turn causes a field gradient in a leaking stray field.
    • - Bringing the material to be separated - as mentioned in the form of a suspension, a thin slurry or the like. - On the tape, the magnetic components of the material are attracted to these locally existing field gradients and held to a certain extent. So they move with the stray field gradient of the band. When applied countercurrently, the particles accumulate more and more until a kind of saturation is achieved.
    • - If the thus loaded with magnetic particles tape is pulled out of the range of the magnetization field, the magnetic components remain on the tape, adhere, provided that the magnetic properties of the strip material were chosen so that a remanent magnetization is maintained even in the field-free state (high remanence ( Br) / saturation (B s ) ratio).
    • In the case of typical cold-rolled stainless steel sheets, the latter property is produced during magnetization in the strip / rolling direction
    • - The thus separated particles also adhere after the tape material has left the liquid.
    • - Only if in a second magnetization step by demagnetization z. B. in the opposite field or in a decreasing alternating field, the magnetic moment of the strip material is brought to disappear, the gradient and thus also the forces acting on the particles disappear. In this state, it is relatively easy, for. B. by air flow or mechanically by brushing to remove the magnetic particles from the belt.
    • After this step, the tape is ready to be magnetized again and again to pick up particles from the suspension flowing over it.
  • Further Details and advantages of the invention will become apparent from the following Description of the figures of exemplary embodiments with reference to the drawing in conjunction with the claims. It demonstrate
  • 1 a schematic representation of an improved magnetic separator with a revolving belt conveyor,
  • 2 the top view of the material used for the belt conveyor,
  • 3 a plan view of locally heat treated areas of the material according to 2 and
  • 4 a cross section of the material according to 3 to explain the mode of action according to the invention with associated particles in the magnetic field and an associated section in the region of the magnetic field gradient.
  • facilities for separating magnetic Bestanteilen from a substance, in particular Substances with fluid consistency are found in many technology fields can be used and are referred to as magnetic separators. Technically particularly interesting are separators that work continuously, and low maintenance.
  • following is a novel concept described, with which a kind Flatbed separator made of band-shaped material can be realized, who is able to get over the flat bed material passed suspensions magnetic particles to be taken and outside deposit. The advantage of this separator is the low energy requirement, continuous process management, low maintenance and high process reliability.
  • In 1 For example, for use as a magnetic separator, an exemplary conveyor is provided 1 shown. This consists in a known manner from one over two end rollers 2 respectively. 2 ' continuous endless belt webbing 3 , The material of the tape 3 is magnetizable, which will be discussed below.
  • Inside the webbing 3 are a magnetizer 4 and a demagnetizer 5 attached at a suitable location. magnetizer 4 and demagnetizer 5 can be formed in a known manner, for example as a permanent magnet or as an electromagnet. In particular, the magnetizer 4 In this case, it can also be designed such that it additionally generates a high field gradient in order to also move particles which are located outside the relatively rapidly sloping gradient field of the conveyor into the effective range of the separator
  • It is still a funnel 6 for feeding the conveyor belt with a substance 10 containing magnetic and / or magnetizable impurities present. The impurities are shown schematically as small beads and exemplified with 11 i designated. Furthermore, a recording unit 7 for the substance freed from impurities, with 10 ' is designated present.
  • Based 2 shows that a rolled stainless steel sheet can be used as the starting material for the magnetic separator. For example, a FeCr steel (DIN 4140) is suitable, which is martensitic after a typical cold rolling and thus has ferromagnetic properties. Such a band is with 21 designated.
  • In 3 It is shown that a belt suitable for use with the separator 21 untreated areas 22 that is, accordingly 2 martensitic and thus ferromagnetic. By local heat treatment with a device 25 be in the band 21 produces locally heat-treated areas that are austenitic and thus paramagnetic or non-magnetic. The device 25 For example, a laser, an inductive heating device, a heating wire or the like is used to generate current-driven devices.
  • The effect of the thus pretreated starting material is evident 4 : In the band 21 are separate areas 22 and 23 present, at the boundaries of which gradient fields form. A magnetic field causes a magnetic field in the direction of the ribbon according to the arrow 41 imprinted, taking on the boundaries of the areas 22 and 23 each gradient fields 42 are pronounced.
  • Based on the detail view of the 4 illustrates that the magnetic or magnetizable particles in each case in the north-south or south-north direction align and that thereby creates a resultant force whose size is proportional to the field gradient. By the action of the permanent magnet with reversed Polurig north-south thus the particles can be separated.
  • Next the described arrangement in which the particles of a substance on a conveyor belt can be brought is also a reverse process in which a liquid with magnetic impurities, which is in a container, a device is brought which the above-described magnetic phenomena shows. With that you can likewise the magnetic or magnetizable particles from the substance leached and be separated.
  • In the method described above, it is particularly advantageous that a continuous process can be represented in which a simple process management is present. For this applies:
    • - The magnetization and the demagnetization are two spatially and spatially separated processes, so that a simple separation can take place;
    • - It is only a small amount of energy required, especially when permanent magnets are used;
    • - The stainless steel band is equally corrosion / temperature resistant and conductive, so that no static charges occur;
    • - The dead band material can have a high magnetic moment, z. B. Fe alloys with 1.5 Tesla saturation magnetization; high magnetic field gradients (eg> 100 T / m) can thus be exhibited in a narrow space, provided that the thickness of the suspension layer flow is typically a few mm;
    • - the surface of the band is smooth and even; but it can also be perforated to z. B. specifically set turbulence for a thorough mixing.

Claims (22)

  1. Process for the magnetic separation of magnetic or magnetizable particles of a substance, in particular for cleaning liquid particles containing magnetic particles, such as suspensions, whitewash or the like, with the following process steps: - the substance, in particular the liquid mixture, is brought into contact with solid materials, which are regionally are magnetic or magnetizable or nonmagnetic or nonmagnetizable, - in the section of the magnetizable material are made of the substance to be purified continuously removed the magnetic components.
  2. Method according to claim 1, characterized in that that the substance containing magnetic impurities continuously via a Route led containing individual sections of magnetizable material,
  3. Method according to claim 1, characterized in that that in a container with a liquid mixture containing magnetic impurities a device for continuous removal of the magnetic Components is introduced.
  4. Method according to one of the preceding claims, characterized characterized in that in the section of the magnetizable material Gradient fields arise on the magnetic components act the substance to be purified in the sense of a separation.
  5. Method according to one of the preceding claims, characterized characterized in that the magnetizable areas relative Move to the substance to be cleaned in the opposite direction and a cleaning of the substance takes place in countercurrent principle.
  6. Method according to one of the preceding claims, characterized that the magnetizable material alternately in a first step Magnetized by a first field and in a second step is demagnetized by a second field.
  7. Arrangement for carrying out the method according to claim 1 or one of claims 2 to 6, characterized in that a continuously movable endless belt ( 3 ), that at least individual sections ( 22 . 23 ) of magnetizable material through which the magnetic components ( 11 i ) from the substance to be purified ( 10 ).
  8. Arrangement according to claim 7, characterized in that the endlessly moving belt is a revolving conveyor belt ( 3 ).
  9. Arrangement according to claim 7 or claim 8, characterized in that the circulating belt ( 3 ) is magnetizable in a first step at least in sections by a first outer field and the magnetization is at least partially retained even after switching off the first outer field.
  10. Arrangement according to claim 9, characterized that the first magnetic field is a gradient field that the to be cleaned Substance at least partially penetrates.
  11. Arrangement according to claim 7 or claim 9, characterized in that the circulating belt ( 3 ) is demagnetized in a second step by a second outer field, so that the magnetization approximately disappears.
  12. Arrangement according to one of claims 9, 10 or 11, characterized characterized in that a static field and an alternating field exist are.
  13. Arrangement according to one of claims 7 to 12, characterized in that means ( 4 . 5 ) are present to generate magnetic fields, which act alternately on a rotating belt (1-3)
  14. Arrangement according to claim 7 or one of the subsequent claims, characterized in that the circulating belt ( 3 ) is made of stainless steel and has a martensitic crystal structure formed by cold deformation and / or reinforced.
  15. Arrangement according to one of claims 9 to 14, characterized in that two magnetizable sections ( 22 ) with high remanent magnetization along a first direction in each case through a section ( 23 ), which has a significantly lower remanent magnetization along the first direction than the adjacent sections (FIG. 22 ).
  16. Arrangement according to claim 15, characterized in that the sections ( 23 ) are paramagnetic
  17. Arrangement according to claim 15, characterized in that the sections ( 22 ) have a remanent magnetization directed in a second direction which is approximately perpendicular to the first direction.
  18. Arrangement according to claim 15 or claim 17, characterized in that the first direction in longitudinal axis of the band ( 21 ) shows
  19. Arrangement according to one of claims 7 to 18, characterized in that the circulating belt ( 3 ) of stainless steel at least partially has an austenitic phase, which is characterized by a cubic crystal structure.
  20. Arrangement according to claim 19, characterized that the austenitic phase is generated by local heat treatment
  21. Arrangement according to claim 20, characterized in that in the sections ( 23 ) there is a magnetic gradient field with local heat treatment.
  22. Arrangement according to claim 20 or claim 21, characterized characterized in that the energy supply to the local heat treatment electrically, by direct thermal contact, by radiation and / or inductively takes place.
DE102007010130A 2007-02-28 2007-02-28 Method and arrangement for separating magnetic particles from a substance Expired - Fee Related DE102007010130B4 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE102007010130A DE102007010130B4 (en) 2007-02-28 2007-02-28 Method and arrangement for separating magnetic particles from a substance

Applications Claiming Priority (10)

Application Number Priority Date Filing Date Title
DE102007010130A DE102007010130B4 (en) 2007-02-28 2007-02-28 Method and arrangement for separating magnetic particles from a substance
AT08708702T AT552050T (en) 2007-02-28 2008-02-05 Method and arrangement for separating magnetic particles from a substance
BRPI0807986-2A2A BRPI0807986A2 (en) 2007-02-28 2008-02-05 Process and provision for the separation of magnetic particules of a substance.
AU2008220931A AU2008220931B2 (en) 2007-02-28 2008-02-05 Method and arrangement for separating magnetic particles from a substance
PCT/EP2008/051403 WO2008104445A1 (en) 2007-02-28 2008-02-05 Method and arrangement for separating magnetic particles from a substance
PL08708702T PL2125237T3 (en) 2007-02-28 2008-02-05 Method and arrangement for separating magnetic particles from a substance
EP08708702A EP2125237B1 (en) 2007-02-28 2008-02-05 Method and arrangement for separating magnetic particles from a substance
ARP080100797A AR065489A1 (en) 2007-02-28 2008-02-27 Installation procedure for the separation of magnetic particles of a substance
PE2008000394A PE20081812A1 (en) 2007-02-28 2008-02-27 Procedure and installation for separation of magnetic particles of a substance
ZA200904612A ZA200904612B (en) 2007-02-28 2009-07-01 Method and arrangement for separating magnetic particles from a substance

Publications (2)

Publication Number Publication Date
DE102007010130A1 DE102007010130A1 (en) 2008-09-04
DE102007010130B4 true DE102007010130B4 (en) 2009-12-31

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DE102007010130A Expired - Fee Related DE102007010130B4 (en) 2007-02-28 2007-02-28 Method and arrangement for separating magnetic particles from a substance

Country Status (10)

Country Link
EP (1) EP2125237B1 (en)
AR (1) AR065489A1 (en)
AT (1) AT552050T (en)
AU (1) AU2008220931B2 (en)
BR (1) BRPI0807986A2 (en)
DE (1) DE102007010130B4 (en)
PE (1) PE20081812A1 (en)
PL (1) PL2125237T3 (en)
WO (1) WO2008104445A1 (en)
ZA (1) ZA200904612B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011004321A1 (en) * 2011-02-17 2012-08-23 Krones Aktiengesellschaft Magnetic discharge from bottle washing machines

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1957636A1 (en) * 1969-11-17 1971-05-27 Hazemag Hartzerkleinerung A process for the deposition of iron from Muell
DE2235271A1 (en) * 1971-07-20 1973-03-01 Nippon Mining Co magnetic nasschneider
DE3225647A1 (en) * 1981-07-06 1983-01-20 Cryogenic Consult Magnetic separating plant for minerals
DE102005032661A1 (en) * 2005-07-13 2006-04-20 Schott Ag Cleaning magnetic separator, for removing magnetizable impurities from non-metallic particles, especially crushed quartz glass for recycling, using suction unit with slit nozzle located after magnetic zone

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Publication number Priority date Publication date Assignee Title
GB626887A (en) * 1940-11-12 1949-07-22 Dings Magnetic Separator Co Improvements in magnetic separators
GB1511488A (en) * 1974-11-22 1978-05-17 English Clays Lovering Pochin Magnetic separation
US4059510A (en) * 1975-02-05 1977-11-22 Readings Of Lismore Pty. Limited Magnetic separators
GB1576427A (en) * 1976-04-29 1980-10-08 English Clays Lovering Pochin Magnetic separators
JPS6028544B2 (en) * 1980-11-12 1985-07-05 Bunri Kogyo Kk
GB2089242A (en) * 1980-12-16 1982-06-23 British Nuclear Fuels Ltd A ferromagnetic collector for magnetic separation
JPH0157607B2 (en) * 1981-08-20 1989-12-06 Unitika Ltd
GB2261833A (en) * 1991-11-26 1993-06-02 Csir Magnetic separation of materials
SE518215C2 (en) * 1999-12-16 2002-09-10 Aelmhults El Mek Ab A method and apparatus for the separation of metal chips

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1957636A1 (en) * 1969-11-17 1971-05-27 Hazemag Hartzerkleinerung A process for the deposition of iron from Muell
DE2235271A1 (en) * 1971-07-20 1973-03-01 Nippon Mining Co magnetic nasschneider
DE3225647A1 (en) * 1981-07-06 1983-01-20 Cryogenic Consult Magnetic separating plant for minerals
DE102005032661A1 (en) * 2005-07-13 2006-04-20 Schott Ag Cleaning magnetic separator, for removing magnetizable impurities from non-metallic particles, especially crushed quartz glass for recycling, using suction unit with slit nozzle located after magnetic zone

Also Published As

Publication number Publication date
PE20081812A1 (en) 2009-02-21
DE102007010130A1 (en) 2008-09-04
EP2125237A1 (en) 2009-12-02
AU2008220931B2 (en) 2010-11-18
AU2008220931A1 (en) 2008-09-04
ZA200904612B (en) 2010-04-28
EP2125237B1 (en) 2012-04-04
BRPI0807986A2 (en) 2014-06-24
PL2125237T3 (en) 2012-09-28
WO2008104445A1 (en) 2008-09-04
AR065489A1 (en) 2009-06-10
AT552050T (en) 2012-04-15

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