EP0137172B1 - High-intensity magnetic separator - Google Patents

High-intensity magnetic separator Download PDF

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Publication number
EP0137172B1
EP0137172B1 EP84109058A EP84109058A EP0137172B1 EP 0137172 B1 EP0137172 B1 EP 0137172B1 EP 84109058 A EP84109058 A EP 84109058A EP 84109058 A EP84109058 A EP 84109058A EP 0137172 B1 EP0137172 B1 EP 0137172B1
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EP
European Patent Office
Prior art keywords
space
magnetic
plane
field strength
poles
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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
Application number
EP84109058A
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German (de)
French (fr)
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EP0137172A3 (en
EP0137172A2 (en
Inventor
Karl-Heinz Kukuck
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.)
ThyssenKrupp Industrial Solutions AG
Original Assignee
Krupp Polysius AG
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Publication date
Application filed by Krupp Polysius AG filed Critical Krupp Polysius AG
Publication of EP0137172A2 publication Critical patent/EP0137172A2/en
Publication of EP0137172A3 publication Critical patent/EP0137172A3/en
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Publication of EP0137172B1 publication Critical patent/EP0137172B1/en
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    • 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
    • B03C1/035—Open gradient magnetic separators, i.e. separators in which the gap is unobstructed, characterised by the configuration of the gap

Definitions

  • the invention relates to a strong field magnetic separator according to the preamble of claim 1.
  • Strong field magnetic separators such as those used for the sorting of weakly magnetic minerals, contain flow spaces with more or less converging magnetic fields, whereby the magnetic particles carried by the turbidity are led through the converging magnetic field to a pole and adhere there.
  • a magnetic separator is known from WO-A-8 002 280, for example, which has semicircular, annular passage channels between the pole pieces.
  • FR-A-1 141 536 also describes a magnetic separator whose pole pieces have projections and recesses arranged between them on the opposite surfaces, the projections of one pole piece lying opposite the recesses of the other pole piece, so that an inhomogeneous magnetic field in the flow space for the same Cloudiness arises.
  • a strong field magnetic separator according to the preamble of claim 1 is finally known from DE-C-405 920. It contains side-by-side cutting poles that face a surface pole. The magnetic particles carried by the slurry are guided to the cutting edge by the strongly converging magnetic field.
  • the separation success is determined, among other things, by the differences in the field strength. If, for example, the surface and cutting poles are formed by plates that have a flat surface on one side and ribs with a triangular cross-sectional profile on the other side, there is the maximum of the field strength in the area of the rib ridge and the minimum of the field strength in the area of the rib base.
  • the selectivity of a magnetic separator is determined by its ability to separate particles with different mass and different magnetic susceptibility. Magnetic and non-magnetic particles are distributed almost evenly in the flow space. In order to be able to polarize small magnetic particles in the area of the base of the rib, a minimum field strength is required there. At this value of the minimum field strength in the area of the base of the ribs, a correspondingly higher field strength results on the rib ridge, by means of which larger, but specifically weaker magnetic particles, which are supposed to get into the non-magnetic discharge, are attracted to the rib ridge.
  • the invention is therefore based on the object of developing a strong field magnetic separator which is distinguished by a greater selectivity.
  • the boundary between the space filled with non-magnetic material and the space forming the flow channel for the sludge expediently runs approximately along an area of the same field strength. The selection of this area results from a compromise between the desired values of the throughput rate and the selectivity.
  • the known Starkfe f d magnetic separator illustrated schematically in FIG. 1 contains a number of opposing surface poles and cutting edge poles, which are formed by plates 1 which have a flat surface 2 on one side and ribs 3 with a triangular cross-sectional profile on the other side.
  • the flange surface 2 forms the surface pole and the ribs 3 the cutting pole.
  • FIG. 2 shows the course of the magnetic forces (relative values) within the area designated by x in FIG. 1.
  • the amounts vary between 0.566 (maximum) at the rib crest and 0.005 (minimum) in the area of the rib base.
  • the result of this large area is that a mixture which is very heterogeneous in its magnetic susceptibility and grain size is excited in a wide range. This results in a poor degree of separation.
  • the space between the surface pole (flat surface 2) and the opposing cutting edge poles (ribs 3) is in a space 5 filled with non-magnetic, wear-resistant material and having a low field strength and a space 6 forming the flow channels for the turbidity high field strength divided.
  • the space 5 filled with non-magnetic material extends from the flat surface 2 to the rib base 7, during which the space 6 forming the flow channels for the slurry surrounds the rib comb 8 and ends in the region of the rib flanks 9.
  • the boundary 10 between the rooms 5 and 6 is designed in the embodiment of FIG. 3 approximately circular arc. This boundary expediently follows an area of the same field strength.

Description

Die Erfindung betrifft einen Starkfeld-Magnetscheider entsprechend dem Oberbegriff des Anspruches 1.The invention relates to a strong field magnetic separator according to the preamble of claim 1.

Starkfeld-Magnetscheider, wie sie insbesondere für die Sortierung schwach magnetischer Mineralien eingesetzt werden, enthalten Strömungsräume mit mehr oder weniger konvergierenden Magnetfelder, wobei die von der Trübe mitgeführten magnetischen Partikel durch das konvergierende Magnetfeld zu einem Pol geführt werden und dort anhaften.Strong field magnetic separators, such as those used for the sorting of weakly magnetic minerals, contain flow spaces with more or less converging magnetic fields, whereby the magnetic particles carried by the turbidity are led through the converging magnetic field to a pole and adhere there.

Durch die WO-A- 8 002 280 ist beispielsweise ein Magnetscheider bekannt, der halbkreisförmig ausgebildete, ringförmige Durchtrittskanäle zwischen den Polschuhen aufweist. Die FR-A- 1 141 536 beschreibt weiterhin einen Magnetscheider, dessen Polschuhe an den einander gegenüberliegenden Flächen Vorsprünge und dazwischen angeordnete Vertiefungen aufweisen, wobei die Vorsprünge des einen Polschuhes den Vertiefungen des anderen Polschuhes gegenüberliegen, so dß gleichfalls ein inhomogenes Magnetfeld im Strömungsraum für die Trübe entsteht.A magnetic separator is known from WO-A-8 002 280, for example, which has semicircular, annular passage channels between the pole pieces. FR-A-1 141 536 also describes a magnetic separator whose pole pieces have projections and recesses arranged between them on the opposite surfaces, the projections of one pole piece lying opposite the recesses of the other pole piece, so that an inhomogeneous magnetic field in the flow space for the same Cloudiness arises.

Ein Starkfeld-Magnetscheider entsprechend dem Oberbegriff des Anspruches 1 ist schließlich durch die DE-C- 405 920 bekannt. Er enthält nebeneinander angeordnete Schneidenpole, die einem Flächenpol gegenüberstehen. Die von der Trübe mitgeführten magnetischen Partikel werden hierbei durch das stark konvergierende Magnetfeld zu den Schneidenpolen geführt.A strong field magnetic separator according to the preamble of claim 1 is finally known from DE-C-405 920. It contains side-by-side cutting poles that face a surface pole. The magnetic particles carried by the slurry are guided to the cutting edge by the strongly converging magnetic field.

Der Trennerfolg wird hierbei unter anderem von den Unterschieden der Feldstärke bestimmt. Werden beispielsweise die Flächen- und Schneidenpole durch Platten gebildet, die auf der einen Seite eine Planfläche und auf der anderen Seite Rippen mit dreieckförmigem Querschnittsprofil aufweisen, so herrscht das Maximum der Feldstärke im Bereich des Rippenkammes und das Minimum der Feldstärke im Bereich des Rippengrundes.The separation success is determined, among other things, by the differences in the field strength. If, for example, the surface and cutting poles are formed by plates that have a flat surface on one side and ribs with a triangular cross-sectional profile on the other side, there is the maximum of the field strength in the area of the rib ridge and the minimum of the field strength in the area of the rib base.

Nun wird die Trennschärfe eines Magnetscheiders durch seine Fähigkeit bestimmt, Partikel mit unterschiedlicher Masse und unterschiedlicher magnetischer Suszeptibilität abzuscheiden. Magnetische und unmagnetische Partikel sind im Strömungsraum annähernd gleichmäßig verteilt. Um kleine magnetische Partikel im Bereich des Rippengrundes polarisieren zu können, ist dort eine Mindestfeldstärke erforderlich. Bei diesem Wert der Mindestfeldstärke im Bereich des Rippengrundes ergibt sich am Rippenkamm eine entsprechend höhere Feldstärke, durch die dann größere, jedoch spezifisch schwächer magnetische Partikel, die an sich in den unmagnetischen Austrag gelangen sollen, zum Rippenkamm angezogen werden.Now the selectivity of a magnetic separator is determined by its ability to separate particles with different mass and different magnetic susceptibility. Magnetic and non-magnetic particles are distributed almost evenly in the flow space. In order to be able to polarize small magnetic particles in the area of the base of the rib, a minimum field strength is required there. At this value of the minimum field strength in the area of the base of the ribs, a correspondingly higher field strength results on the rib ridge, by means of which larger, but specifically weaker magnetic particles, which are supposed to get into the non-magnetic discharge, are attracted to the rib ridge.

Der Erfindung liegt daher die Aufgabe zugrunde, einen Starkfeld-Magnetscheider zu entwickeln, der sich durch eine größere Trennschärfe auszeichnet.The invention is therefore based on the object of developing a strong field magnetic separator which is distinguished by a greater selectivity.

Diese Aufgabe wird erfindungsgemäß durch die kennzeichnenden Merkmale des Anspruches 1 gelöst.This object is achieved by the characterizing features of claim 1.

Durch die Ultterteilung des Raumes zwischen dem Flächenpo4 und einem gegenüberstehenden Schneidenpol in einen mit unmagnetischem, verschleißfestem Material gefüllten Raum niedriger Feldstärke und einen den Strömungskanat für die Trübe bildenden Raum hoher Feldstärke wird die Feldstärkedifferenz innerhalb des Strömungskanales in erwünschter Weise verringert. Damit wird die Gefahr verkleinert, daß große, jedoch spezifisch schwächer magnetische Partikel im Gebiet höchster Feldstärke an den Schneidenpol gezogen und damit abgeschieden werden.The U l of the space between the Flächenpo4 and an opposing Schneidenpol tterteilung in a container filled with non-magnetic, wear-resistant material space low field strength and the Strömungskanat forming for the pulp chamber of high field strength, the field strength difference is reduced within the flow channel in the desired manner. This reduces the risk that large, but specifically weaker magnetic particles in the area with the highest field strength are drawn to the cutting pole and thus separated.

Zweckmäßig verläuft die Grenze zwischen dem mit unmagnetischem Mßterial gefüllten Raum und dem den Strömungskanal für die Trübe bildenden Raum annähernd längs einer Fläche gleicher Feldstärke. Die Auswahl dieser Fläche resultiert dabei aus einem Kompromiß zwischen den gewünschten Werten der Durchsatzrate und der Trennschärfe.The boundary between the space filled with non-magnetic material and the space forming the flow channel for the sludge expediently runs approximately along an area of the same field strength. The selection of this area results from a compromise between the desired values of the throughput rate and the selectivity.

Ein Ausführungsbeispiel der Erfindung ist in der Zeichnung veranschaulicht. Es zeigen

  • Fig. 1 eine Schemadarstellung eines bekannten Starkfeld-Magnetscheiders.
  • Fig. 2 ein Diagramm, das den Verlauf der Magnetkräfte in dem in Fig. 1 mit x bezeichneten Raum wiedergibt,
  • Fig. 3 eine Schemadarstellung des erfindungsgemäßen Starkfeld-Magnetscheiders.
An embodiment of the invention is illustrated in the drawing. Show it
  • Fig. 1 is a schematic representation of a known strong field magnetic separator.
  • 2 is a diagram showing the course of the magnetic forces in the space designated by x in FIG. 1,
  • Fig. 3 is a schematic representation of the strong field magnetic separator according to the invention.

Der in Fig. 1 schematisch veranschaulichte bekannte Starkfefd-Magnetscheider enthält eine Anzahl von einander gegenüberstehenden Flächenpolen und Schneidenpolen, die durch Platten 1 gebildet werden, die auf der einen Seite eine Planfläche 2 und auf der anderen Seite Rippen 3 mit dreieckförmigem Querschnittsprofil aufweisen. Die Pfanfläche 2 bildet hierbei den Flächenpol und die Rippen 3 die Schneidenpole.The known Starkfe f d magnetic separator illustrated schematically in FIG. 1 contains a number of opposing surface poles and cutting edge poles, which are formed by plates 1 which have a flat surface 2 on one side and ribs 3 with a triangular cross-sectional profile on the other side. The flange surface 2 forms the surface pole and the ribs 3 the cutting pole.

Zwischen der Planfläche 2 und den Rippen 3 ist ein Strömungskanal 4 für die Trübe vorhanden, die die abzuscheidenden magnetischen Partikel enthält.Between the flat surface 2 and the ribs 3 there is a flow channel 4 for the slurry, which contains the magnetic particles to be separated.

Fig. 2 zeigt dem Verlauf der Magnetkräfte (Relativwerte) innerhalb des in Fig. 1 mit x bezeichneten Gebietes. Die Beträge variieren zwischen 0,566 (Maximum) am Rippenkamm und 0,005 (Minimum) im Bereich des Rippengrundes. Dieser große Bereich hat zur Folge, daß ein in seiner magnetischen Suszeptibilität und Korngröße sehr heterogenes Gemisch in großer Bandbreite angeregt wird. Daraus resultiert ein schlechter Trenngrad.FIG. 2 shows the course of the magnetic forces (relative values) within the area designated by x in FIG. 1. The amounts vary between 0.566 (maximum) at the rib crest and 0.005 (minimum) in the area of the rib base. The result of this large area is that a mixture which is very heterogeneous in its magnetic susceptibility and grain size is excited in a wide range. This results in a poor degree of separation.

Bei der in Fig. 3 dargestellten erfindungsgemäßen Lösung ist demgegenüber der Raum zwischen dem Flächenpol (Planfläche 2) und den gegenüberstehenden Schneidenpolen (Rippen 3) in einen mit unmagnetischem, verschleißfesten Material gefüllten Raum 5 niedriger Feldstärke und einen die Strömungskanäle für die Trübe bildenden Raum 6 hoher Feldstärke unterteilt.In contrast, in the solution according to the invention shown in FIG. 3, the space between the surface pole (flat surface 2) and the opposing cutting edge poles (ribs 3) is in a space 5 filled with non-magnetic, wear-resistant material and having a low field strength and a space 6 forming the flow channels for the turbidity high field strength divided.

Dabei erstreckt sich der mit unmagnetischem Material gefüllte Raum 5 von der Planfläche 2 bis zum Rippengrund 7, während der die Strömungskanäle für die Trübe bildende Raum 6 den Rippenkamm 8 umschließt und im Bereich der Rippenflanken 9 endet.The space 5 filled with non-magnetic material extends from the flat surface 2 to the rib base 7, during which the space 6 forming the flow channels for the slurry surrounds the rib comb 8 and ends in the region of the rib flanks 9.

Die Grenze 10 zwischen den Räumen 5 und 6 ist bei dem Ausführungsbeispiel gemäß Fig. 3 annähernd kreisbogenförmig gestaltet. Zweckmäßig folgt diese Grenze einer Fläche gleicher Feldstärke.The boundary 10 between the rooms 5 and 6 is designed in the embodiment of FIG. 3 approximately circular arc. This boundary expediently follows an area of the same field strength.

In Fig. 2 sind schematisch drei Linien gleicher Feldstärke (und damit gleicher magnetischer Kraft) für die Relativwerte 0,05, 0,03 und 0,02 eingezeichnet.In Fig. 2 three lines of the same field strength (and thus the same magnetic force) for the relative values 0.05, 0.03 and 0.02 are shown schematically.

Claims (3)

1. High intensity magnetic separator, comprising a number of plane poles and knife shaped poles which lie opposite one another producing strongly converging magnetic fields, flow channels for the slurry being provided between the plane poles and the knife shaped poles, characterised in that the space between the plane pole (2) and an opposing knife shaped pole (3) is divided into a space (5) which is filled with non-magnetic wear-resistant material and has a low field strength and a space (6) which forms the flow channel for the slurry and has a high field strength.
2. Magnetic separator as claimed in claim 1, characterised in that the boundary between the space (5) filled with non-magnetic material and the space (6) which forms the flow channel for the slurry runs approximately along a surface of equal field strength.
3. Magnetic separator as claimed in claim 1, in which the plane and knife shaped poles are formed by plates which have on one side a plane surface and on the other side ribs with a triangular cross-section, characterised in that the space (5) which is filled with non-magnetic material extends from the plane surface (2) of a plate (1) to the base of the rib (7) of the adjacent plate, whilst the space (6) which forms the flow channel for the slurry surrounds the crest (8) of the rib and ends in the region of the sides (9) of the rib.
EP84109058A 1983-10-12 1984-07-31 High-intensity magnetic separator Expired EP0137172B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19833337145 DE3337145A1 (en) 1983-10-12 1983-10-12 STARKFELD-MAGNETSCHEIDER
DE3337145 1983-10-12

Publications (3)

Publication Number Publication Date
EP0137172A2 EP0137172A2 (en) 1985-04-17
EP0137172A3 EP0137172A3 (en) 1985-07-24
EP0137172B1 true EP0137172B1 (en) 1986-10-15

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ID=6211666

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Application Number Title Priority Date Filing Date
EP84109058A Expired EP0137172B1 (en) 1983-10-12 1984-07-31 High-intensity magnetic separator

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EP (1) EP0137172B1 (en)
AU (1) AU3414984A (en)
DE (2) DE3337145A1 (en)
ZA (1) ZA846125B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3764390D1 (en) * 1986-04-21 1990-09-27 Siemens Ag METHOD FOR CONTINUOUS SEPARATION OF MAGNETIZABLE PARTICLES AND DEVICE FOR ITS IMPLEMENTATION.

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE405920C (en) * 1924-01-13 1924-11-18 Fried Krupp Grusonwerk Akt Ges Zone pole for magnetic zone separators
FR1141536A (en) * 1956-01-19 1957-09-03 Magnetic separator in aqueous medium
DE2916634A1 (en) * 1979-04-25 1980-11-13 Schloemann Siemag Ag METHOD AND DEVICE FOR DEPOSITING SINTER OR THE LIKE. MAGNETICALLY RELATED PARTICLES FROM USED OR WASTE WATER

Also Published As

Publication number Publication date
EP0137172A3 (en) 1985-07-24
DE3460939D1 (en) 1986-11-20
ZA846125B (en) 1985-04-24
AU3414984A (en) 1985-04-18
EP0137172A2 (en) 1985-04-17
DE3337145A1 (en) 1985-04-25

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