EP0862948B1 - Séparateur magnétique - Google Patents

Séparateur magnétique Download PDF

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Publication number
EP0862948B1
EP0862948B1 EP98102052A EP98102052A EP0862948B1 EP 0862948 B1 EP0862948 B1 EP 0862948B1 EP 98102052 A EP98102052 A EP 98102052A EP 98102052 A EP98102052 A EP 98102052A EP 0862948 B1 EP0862948 B1 EP 0862948B1
Authority
EP
European Patent Office
Prior art keywords
housing
pipe
magnetic separator
particles
longitudinal axis
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 - Lifetime
Application number
EP98102052A
Other languages
German (de)
English (en)
Other versions
EP0862948A1 (fr
Inventor
Matthias Dr. Franzreb
Siegfried Prof. Dr. Eberle
Wolfgang Dr. Höll
Percy Kampeis
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.)
Forschungszentrum Karlsruhe GmbH
Original Assignee
Forschungszentrum Karlsruhe GmbH
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
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Publication of EP0862948A1 publication Critical patent/EP0862948A1/fr
Application granted granted Critical
Publication of EP0862948B1 publication Critical patent/EP0862948B1/fr
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
    • B03C1/035—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 magnetic separator according to the preamble of the first claim.
  • Such a magnetic separator is from the publication R.P.A.R. van Kleef, H.W. Myron, P. Wyder and M. R. Parker: "Application of Magnetic Flocculation in a Continuous Flow Magnetic Separator ", IEEE TRANSACTIONS ON MAGNETICS, Vol. MAG-20, No. 5 (1984) 1168-1170.
  • the magnetic separator is there from a vertically arranged, cylindrical housing, that is tapered in its lower part; he is with an inlet pipe that protrudes into the housing. How Shown in a schematic is the lower one Provide a baffle plate at the end of the inlet pipe a distance from the mouth of the inlet pipe is attached.
  • the lower part of the housing is conical and runs in a drain pipe.
  • Another drain pipe is as an overflow educated; The cleaned flows through this drain pipe Fluid from the device.
  • the device is between the Pole shoes of a permanent magnet or in the cavity of one electrical coil used, part of the housing the Area of the largest magnetic field gradient at the upper end of the Coil is exposed.
  • the device is used to separate diamagnetic from ferro- and paramagnetic particles in fluids.
  • the withdrawal rate of the ferro- and paramagnetic particles is caused by a non-homogeneous magnetic field as it is on the edge of an electrical Coil occurs, amplified considerably. Under the influence of the inhomogeneous magnetic field, the settling rate is so great that ferro- and paramagnetic particles against the current of the Fluids are pulled down.
  • the magnetic separator will filled with the particle-laden fluid via the inlet pipe, which is deflected on the baffle plate and in the radial direction flows into the housing. In the housing experience ferro- and paramagnetic particle a downward magnetic Force and leave the case through the spout at the bottom End of the conical area. The fluid and possibly contained diamagnetic particles flow upwards and leave the housing through the overflow.
  • this magnetic separator has have so far not been able to prevail in practice. Therefor two effects are primarily responsible. In addition to the desired has an anti-parallel component to the direction of flow the magnetic field in the area of the housing always a certain Proportion that acts perpendicular to the direction of flow. This creates a force on the ferro- and paramagnetic Particles towards the housing wall. The resulting one Part of the particles adhered to the housing wall leads to a gradual narrowing of the cross section and that these particles do not have the conical area with the Reach the outlet pipe. A second problem is that it is because of of the commonly used strong magnetic fields to one Particle agglomeration comes within the housing.
  • the ferro- and paramagnetic particles form a relatively solid, coherent Bed that is not from the incoming suspension is more evenly flowed through. Rather, in addition to compact, areas not flowed through quickly “Channels” on. The flow velocity is within these "channels" greatly increased, making the ferro- and paramagnetic Particles are transported with the fluid and get into the outlet, so that the separation performance deteriorated.
  • EP 0 014 802 B1 relates to a method for separating a heterogeneous catalyst, which is a magnetic or magnetizable Contains metal from a liquid phase.
  • the Document describes a magnetic separator for implementation of the procedure in which the content of the magnetic separator stirred with the help of a stirrer equipped with turbine blades becomes.
  • Another magnetic separator is described in GB 2 215 640 B.
  • the magnetic separator is operated discontinuously.
  • the distribution of the supplied fluid takes place in one of the Magnetic separator used, hollow cylindrical baffle plate, around which the fluid is directed in a spiral.
  • the invention has for its object a magnetic separator to propose of the type mentioned, in which the inflowing particle-laden fluid distributed more evenly in the housing and in Movement is kept so that the particles at most in to a small extent on the housing wall.
  • a magnetic separator mentioned type provided a rotatable inlet pipe.
  • a cross tube on the rotatable inlet pipe Preferably is at least one cross tube on the rotatable inlet pipe appropriate.
  • the cross tube is preferably at a right angle Supply pipe; however, angles other than the right are also possible.
  • the cross pipe should be rotationally symmetrical to the inlet pipe arranged and provided with outflow openings for the fluid, which are arranged along the axis of the cross tube. So that Fluid emerges from the outflow openings, the ends of the Inlet pipe and the cross pipe are closed.
  • the cross tubes preferably offset from one another on the inlet pipe. With this arrangement, deposits on the To largely prevent housing walls.
  • a further equalization of the fluid flow within of the housing can be achieved in that in the housing one or more gratings installed transversely to the longitudinal axis of the housing become.
  • Another advantage of such grids is that it is in the range of Lattice due to increased collisions to an assembly of fine particles and thus for better retention the fine fraction comes.
  • An embodiment of the magnetic separator is particularly preferred, a conical one at the inlet pipe Clearing device is provided.
  • the conical clearing device is designed in such a way that the particles, which are conical Collect part of the housing, conveyed into the drain pipe become.
  • the magnetic separator according to the invention also contains at least a filtrate drain pipe, preferably in the upper area is arranged. This leaves through the filtrate drain pipe cleaned fluid the magnetic separator while the concentrated Particles are removed from the concentrate drain pipe.
  • the magnetic separator according to the invention is in a device used to generate an electric field.
  • This facility can be an electrical coil or a permanent magnet be with two pole pieces.
  • the middle area of the case should be in the zone of the highest gradients of the magnetic field strength lie.
  • This zone forms a magnetic one for the particles Barrier.
  • For stationary operation of the magnetic separator to achieve it is therefore necessary to accumulate Particles via a drain pipe from the magnetic field area deducted.
  • the problem arises here that also in The course of the concentrate withdrawal the particles a magnetic Must overcome the barrier.
  • the problem is solved that the cross section of the concentrate draw is very small in comparison is chosen for the exit surface of the filtrate, whereby resulting from the high flow rate strong hydrodynamic drag forces the magnetic forces can overcome.
  • Fig. 1 shows a longitudinal section through an embodiment of the magnetic separator according to the invention.
  • a hollow shaft seal 1 is an inlet pipe 2, which is designed as a hollow shaft is rotatably mounted.
  • the hollow shaft seal 1 and filtrate drain pipes 3 are integrated in a flange cover 4, the on a flange ring 5 on the housing 6 of the magnetic separator can be screwed on.
  • the flange cover 4 and the flange ring 5 are sealed by an O-ring 7.
  • the housing 6 is cylindrical; its diameter is chosen so that it is in used the central cavity of an electrical coil can be.
  • the immersion depth of the magnetic separator in the Cavity can be varied by a height adjustment 8.
  • the inlet pipe 2 ends above the bottom of the housing 6, which is conical is shaped. At the top of the conical bottom opens a concentrate drain pipe 9 in the housing. The inlet pipe 2 is closed at its end in the housing. At this The end of the inlet pipe 2 is fixed with a clearing device 10 connected; is an embodiment of the clearing device 10 shown in Fig. 3.
  • a cross pipe 11 is also symmetrical on the inlet pipe 2 sealed ends attached that along its longitudinal axis is provided with outflow openings 12 (see FIG. 2).
  • the cross tube is located in that part of the housing 6 which in immerses the cavity of the electrical coil.
  • the housing 6 is in the area between the cross tube 11 and the flange cover 4 provided with two grids 14 (see Fig. 4) on brackets 13 can be placed.
  • FIG. 2 shows a top view of the magnetic separator shown in FIG. 1.
  • the flange cover 4 is via screw connections 15 connected to the flange ring 5 on the housing 6.
  • the cross tube 11 is placed, along the longitudinal axis of the Outflow openings 12 are rotationally symmetrical.
  • the clearing device 10 is attached to the inlet pipe 2.
  • Fig. 3 shows a differently shaped clearing device 10, the curved Has clearing blades.
  • Fig. 4 shows a grid 14 which from the bracket 13 on the Housing wall 6 is worn.
  • the magnetic separator according to the invention can be operated continuously become.
  • the one loaded with the particles to be separated Fluid flows through the inlet pipe, which is set in slow rotation 2 introduced into the housing 6.
  • Via the outflow openings 12 the fluid is distributed evenly in the cross tube 11; Moreover can thereby avoid deposits on the walls of the housing 6 become.
  • the too contains the conical part forms continuously Operating a sludge zone where the particles are concentrated are.
  • the cleaned fluid leaves the magnetic separator the filtrate drain pipes 3 in the flange cover 4; the particles will due to the magnetic barrier in the area of the largest change in field strength of the magnetic field is retained.
  • Concentrate drain pipe 9 the cross section of which is smaller is as the cross section of the inlet pipe 2. So that in the conical area the formation of deposits on the housing wall can be avoided is at the end of the inlet pipe 2 Broaching device 10 attached to the inlet pipe 2 in Rotation is offset. The blades are angled in the way that they are very close to the conical area Bearing the inner wall of the housing 6. The rotating clearing device 10 effects the transport of the concentrated particles before opening the concentrate drain pipe. In the case of more water Particles such as B. hydroxide slurries, the particles additionally compacted, whereby the solids content in Concentrate drain pipe 9 can be increased.
  • FIG. 3 curved blades shown, the even better Allow the particles to be transported to the concentrate discharge.

Landscapes

  • Centrifugal Separators (AREA)
  • Liquid Crystal (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Dry Shavers And Clippers (AREA)
  • Cyclones (AREA)
  • Water Treatment By Electricity Or Magnetism (AREA)

Claims (4)

  1. Séparateur magnétique pour séparer d'un fluide des particules aimantables sous la forme d'un concentrat dans lequel les particules sont en suspension dans le fluide, comprenant
    a) un boítier cylindrique (6) avec un axe longitudinal, ce boítier étant placé dans une installation créant un champ magnétique,
    b) un tube d'alimentation (2) suivant l'axe longitudinal, débouchant dans le boítier (6),
    c) un tube de sortie (9) pour le concentrat et
    d) une sortie de filtrat (3),
    caractérisé en ce que
    e) le tube d'alimentation (2) est relié au boítier (6) de manière à tourner autour de l'axe longitudinal, et
    f) un tube transversal (11) monté sur le tube d'alimentation (2) et ayant, le long de son axe longitudinal, des orifices de sortie (12) symétriques en rotation.
  2. Séparateur magnétique selon la revendication 1,
    caractérisé en ce que
    le tube transversal (11), installé sur le tube d'alimentation (2), fait un angle par rapport à l'axe longitudinal.
  3. Séparateur magnétique selon l'une quelconque des revendications 1 ou 2,
    caractérisé en ce que
    le boítier (6) se termine par une zone conique rejoignant le tube de sortie (9) et le tube d'alimentation (2) comporte un volume conique (10) dans la zone conique pour transférer les particules dans le tube de sortie (9).
  4. Séparateur magnétique selon l'une quelconque des revendication 1, 2 ou 3,
    caractérisé en ce que
    le boítier (6) comporte au moins une grille (14) perpendiculaire à l'axe longitudinal.
EP98102052A 1997-03-04 1998-02-06 Séparateur magnétique Expired - Lifetime EP0862948B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19708697A DE19708697C1 (de) 1997-03-04 1997-03-04 Magnetabscheider
DE19708697 1997-03-04

Publications (2)

Publication Number Publication Date
EP0862948A1 EP0862948A1 (fr) 1998-09-09
EP0862948B1 true EP0862948B1 (fr) 2002-01-09

Family

ID=7822145

Family Applications (1)

Application Number Title Priority Date Filing Date
EP98102052A Expired - Lifetime EP0862948B1 (fr) 1997-03-04 1998-02-06 Séparateur magnétique

Country Status (3)

Country Link
EP (1) EP0862948B1 (fr)
AT (1) ATE211658T1 (fr)
DE (2) DE19708697C1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102004034541B3 (de) * 2004-07-16 2006-02-02 Forschungszentrum Karlsruhe Gmbh Hochgradienten-Magnetabscheider

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0014802B1 (fr) * 1978-12-21 1984-03-21 Imperial Chemical Industries Plc Procédé chimique en phase liquide comprenant la séparation de particules catalytiques par floculation magnétique
JPS5852718B2 (ja) * 1981-12-01 1983-11-24 清進産業株式会社 廃水処理における懸濁物の分離方法と装置
GB2215640B (en) * 1988-02-15 1992-01-22 Andrew John Ker Reid Magnetic separators

Also Published As

Publication number Publication date
ATE211658T1 (de) 2002-01-15
EP0862948A1 (fr) 1998-09-09
DE19708697C1 (de) 1998-05-07
DE59802594D1 (de) 2002-02-14

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