EP3568237A1 - Séparateur magnétique - Google Patents

Séparateur magnétique

Info

Publication number
EP3568237A1
EP3568237A1 EP17719491.7A EP17719491A EP3568237A1 EP 3568237 A1 EP3568237 A1 EP 3568237A1 EP 17719491 A EP17719491 A EP 17719491A EP 3568237 A1 EP3568237 A1 EP 3568237A1
Authority
EP
European Patent Office
Prior art keywords
cylinder
magnetic separator
sorting chamber
material particles
magnetic
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.)
Granted
Application number
EP17719491.7A
Other languages
German (de)
English (en)
Other versions
EP3568237B1 (fr
Inventor
Andreas Schiffers
André BÄTZ
Carsten Gerold
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.)
Loesche GmbH
Original Assignee
Loesche 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
Application filed by Loesche GmbH filed Critical Loesche GmbH
Publication of EP3568237A1 publication Critical patent/EP3568237A1/fr
Application granted granted Critical
Publication of EP3568237B1 publication Critical patent/EP3568237B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

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
    • B03C1/025—High gradient magnetic separators
    • B03C1/031—Component parts; Auxiliary operations
    • B03C1/033—Component parts; Auxiliary operations characterised by the magnetic circuit
    • 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
    • B03C1/10—Magnetic separation acting directly on the substance being separated with cylindrical material carriers
    • B03C1/14—Magnetic separation acting directly on the substance being separated with cylindrical material carriers with non-movable magnets
    • 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
    • B03C1/26—Magnetic separation acting directly on the substance being separated with free falling material
    • 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
    • B03C1/30—Combinations with other devices, not otherwise provided for
    • 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
    • B03C2201/00—Details of magnetic or electrostatic separation
    • B03C2201/20—Magnetic separation whereby the particles to be separated are in solid form

Definitions

  • the invention relates to a magnetic separator for the dry separation of material particles with different magnetic susceptibilities.
  • Ores are often mined from hard rock.
  • valuable mineral minerals grown in the crude product are present together with worthless minerals, which are also called mountains.
  • worthless minerals which are also called mountains.
  • a sorting between the ore mineral and the mountains can take place using different properties of the two goods to be sorted.
  • the finer the degree of adhesion in the raw material the finer it must be comminuted. This means that in part comminution to dust size in the range of about 100 ⁇ and smaller is necessary.
  • the quality of ore deposits worldwide is decreasing, it is becoming more and more difficult to prepare the corresponding solid rock and then to sort it.
  • the invention can also for the treatment of secondary mineral resources such as slags, ashes, other metallurgical residues, such as filter dusts, scale, are used when magnetic or magnetizable components to be concentrated or separated.
  • secondary mineral resources such as slags, ashes, other metallurgical residues, such as filter dusts, scale
  • wet treatment systems or wet magnetic separators which essentially function as a carrier medium via water, and can be used over a wide number of particle sizes in the sense of fineness.
  • the invention is therefore based on the object of providing a magnetic separator for dry-separating material particles having different magnetic susceptibilities, which is suitable for use in a large particle size range, in particular also below 100 ⁇ m. This object is achieved by a magnetic separator with the features of claim 1.
  • the latter has a cylinder which is rotatable about its longitudinal axis and a magnet device which is arranged fixedly within the cylinder and extends substantially over the length of the cylinder.
  • the magnetic device is designed to generate a magnetic field that is essentially uninterrupted in the longitudinal direction of the cylinder.
  • a sorting chamber which extends along at least a portion of the lateral surface of the cylinder in the circumferential direction of the cylinder and parallel to the longitudinal axis of the cylinder along the height of the cylinder.
  • the sorting chamber has, in cross-section, a maximum width which corresponds essentially to the width of the magnetic device and a maximum depth which corresponds to substantially half the width of the magnetic device.
  • the magnetic separator has means for the dispersed deposition of material particles into the sorting chamber and means for generating a conveying air flow through the sorting chamber, wherein in operation the material particles are conveyed through the sorting chamber by means of the conveying air flow.
  • a motor is provided to rotate the cylinder about its longitudinal axis, wherein in operation, the lateral surface of the cylinder is moved by rotation of the cylinder substantially perpendicular to the flow direction of the conveying air and wherein the magnetic device and the cylinder are formed and arranged relative to each other, that the magnetic field substantially in the region of the part of the lateral surface with the sorting chamber and in the sorting chamber has sufficient strength to pull material particles to the lateral surface.
  • the invention is based on several fundamental principles and findings acting in combination. On the one hand, it was recognized that it was important for a good effect It is necessary for the magnetic separator to have a sufficiently strong magnetic field in the sorting chamber through which the conveying air stream flows with the dispersed material particles so that a separation of the different material particles can take place depending on their different magnetic susceptibilities. For this purpose, it is preferred if the sorting chamber is dimensioned such that extends at least within the range of the sorting chamber, in particular which extends along the cylinder, the magnetic field which is generated by the magnetic device.
  • the sorting chamber is dimensioned so that it has a maximum width in cross-section, which corresponds substantially to the width of the magnetic device and has a maximum depth which corresponds substantially to half the width of the magnetic device , It should be noted here that the maximum depth is also dependent on the strength of the magnetic field. In this respect, it may be possible to deviate from this by using a stronger magnet device.
  • the invention is based on the finding that for the purest possible separation of material particles with different magnetic susceptibilities results in a better result, if the flow direction of the conveying air flow is provided substantially perpendicular to the rotational direction of the cylinder. As a result, material particles attracted to the cylinder are rapidly and quickly removed from the sorting chamber by the rotation of the cylinder. Forming too thick a layer of attracted material particles on the cylinder, the magnetic field is weakened as a whole, which in turn leads to poorer sorting or Separierovicn.
  • the magnetic device can be designed in any desired manner.
  • N-pole stands for North Pole and S-Pol for South Pole. It can be a permanent magnet as well as an electromagnet.
  • a three-pole magnet in the sense of the invention can be formed by virtue of the fact that the middle pole acts quasi as a double or common pole and the field lines extend between the middle pole and the respective two outer poles. It is advantageous in the use of a three-pole magnet that magnetic field lines in the middle of the sorting space due to the geometry of the sorting space and the structure of the magnetic device concentrate and thus is achieved with high efficiency and a strong acting on the material particles magnetic field can be generated.
  • a collecting chamber which is located substantially outside the magnetic field of the magnetic device, can be provided in the direction of rotation of the cylinder. Since the magnetic field in the collection chamber no longer acts on the lateral surface of the cylinder, the material particles originally attracted to the lateral surface of the cylinder by the magnetic field are no longer attracted to or retained on the latter. This means that the material particles in the collection chamber detach from the lateral surface of the cylinder and fall off. In other words, it is possible by this construction to take out of the sorting chamber conveyed out material particles in the collection chamber and further dissipate from there. In this context, it is preferable if the magnetic field extends substantially only within the sorting chamber, so that the collecting chamber can then be provided to the sorting chamber, preferably immediately thereafter.
  • entrainment strips which advantageously extend parallel to the longitudinal axis of the cylinder, improve the removal of the material particles which are drawn by the magnetic field to the lateral surface of the cylinder.
  • a sealing region is advantageously formed, whereby the air flow from the collecting chamber into the sorting chamber is adjustable and changeable.
  • an additional post-cleaning of the resulting product which preferably consists only of magnetizable material particles, can be achieved.
  • the air flow which flows through the sealing area between the collecting chamber and the sorting chamber in the direction of the collecting chamber, tears a part of the accumulated on the lateral surface of the cylinder material particles with back into the sorting chamber.
  • explicit injection or cleaning nozzles may be provided, with which air can be blown onto the lateral surface of the cylinder.
  • This explicit inflation of air which can also be called clean-blowing, has the same effect as the air flow through the sealing area.
  • the possibility of adjusting the air flow or the air through the injection nozzles, the purity of the product produced can be adjusted.
  • the means for generating the conveying air flow through the sorting chamber can be designed as desired.
  • air can be actively blown into the sorting chamber.
  • the magnetic separator is operable in relation to the environment in the negative pressure by means of a blower, which sucks air from the magnetic separator.
  • Operation in vacuum has the advantage that the material particles, which have been comminuted to very high finenesses, remain inside the magnetic separator and can not escape from it through any openings.
  • dust pollution problems Environment and the like reduced.
  • ambient air but also corresponding gases such as process gases or air or the like can be understood.
  • a dedusting filter is arranged downstream of the sorting chamber and if a fan for the magnetic separator is provided after the dedusting filter.
  • an acceleration section for the material particles is preferably provided.
  • This acceleration section serves to accelerate the dispersed material particles over a short distance to the speed of the conveying air flow. This can be done for example by a narrowing of the cross section in the lines to the sorting chamber.
  • further means for better dispersion of the material particles in the conveying air flow for example cams, staggered teeth or also static mixers, can be provided.
  • a diffuser may be provided which serves to further disperse the material particles in the conveying air flow.
  • the diffuser can be realized for example by an enlargement or widening of the flow cross-section of the lines. It serves to further disperse the material particle conveying air mixture and to adjust the flow rate to the desired entry speed.
  • the diffuser has an expansion angle between 4 ° to 6 ° to minimize flow separation and / or segregation.
  • a further advantage of providing a diffuser is that the flow rate of the conveying air flow in the sorting chamber is reduced and thus a slow and straightforward passing of the conveying air flow on the lateral surface of the cylinder is made possible.
  • a device for generating opposing or opposing flow rolls can be arranged in the conveying air flow.
  • This device can be embodied, for example, as a triangular and / or angle-adjustable metal sheet, by the shape and orientation of which two counter-rotating flow rolls are generated.
  • Another advantage is that the provision of flow rolls a larger cross section and thus a higher throughput through the sorting chamber is made possible, since it is not mandatory that the magnetic field over the entire cross section of the sorting chamber is strong enough, as by means of the flow rollers the conveyed material particles from areas with too weak a magnetic field are also transported into areas with a strong enough magnetic field.
  • the sorting chamber can have any desired shape in cross section. It is advantageous if it has a rectangular cross section with rounded or bevelled corners. Such a cross-section has been found to be advantageous because it is particularly well adapted to the magnetic field of the magnetic device forming and thus can be achieved in a simple manner that in the sorting chamber no or only very small areas are present, in which the magnetic field is not strong enough works.
  • the magnetic separator false air is formed low entry. This is particularly relevant when the magnetic separator is operated at negative pressure.
  • the low-level air low-level formation prevents unwanted air from outside the magnetic separator in the magnetic separator, in particular is sucked into the sorting canister, and thus the flow velocity in the sorting chamber would be reduced.
  • the fan also requires less energy to produce a sufficient desired flow rate.
  • the magnetic separator is operated continuously.
  • it plays a central role that a continuous discharge of the drawn on the outer surface of the cylinder magnetizable material particles from the sorting chamber is provided in the collection chamber, so that the magnetic separator can be operated continuously.
  • This is also influenced by the fact that a continuous task of material particles to be separated by means of dispersed imparting into the conveying air flow is possible, which flows through the sorting chamber without interruption.
  • Such a design has the advantage that a higher efficiency can be achieved because it is not necessary, for example, for discharging the magnetizable material particles to stop the system and then start again.
  • the length of the sorting chamber and / or the speed of the conveying air flow are designed and set up such that a residence time of the material particles of 0.01 s to 2 s in the sorting chamber is achieved.
  • a residence chamber has proved to be sufficiently long that a good purity and separation between the two types of material particles, the magnetizable and the non-magnetizable, is achieved.
  • Fig. 1 is a schematic overall view of a magnetic separator according to the invention
  • Fig. 2 is a plan view of dispersed dispensing means according to II of Fig. 1;
  • Fig. 3 is a partially sectioned view along the line III of Fig. 3;
  • Fig. 4 is a sectional view taken along line IV of Fig. 1;
  • Fig. 5 is a sectional view of a magnetic separator according to the invention;
  • Fig. 6 is an enlargement of the area VI of Fig. 5;
  • Fig. 7 is a sectional view of a magnetic separator according to the invention.
  • Fig. 1 is a schematic overall view of a magnetic separator 1 according to the invention is shown. In the following, its structure and operation will be explained in more detail, wherein both the components and the operation of the task of the material particles to be separated 5 in the direction of separation into magnetizable material particles 6 and non-magnetizable material particles 7 will be described.
  • magnetizable and non-magnetizable material particles 6, 7 can be understood to have a different magnetic susceptibility, and the magnetizable material particles 6 can be influenced more strongly by a magnetic field than the non-magnetizable material particles 7. It is not mandatory here required that the non-magnetizable material particles 7 are completely unmagnetisierbar.
  • the material particles 5 to be separated are kept in a bunker 3, from which they can be conveyed away via a screw conveyor 4 and transported into the magnetic separator 1 for separation.
  • the material particles 5 to be separated stored in the bunker can have, for example, a fineness of D90 ⁇ 30 m to D90 ⁇ 500 m.
  • About the screw conveyor 4 reach the Material particles 5 to means 50 for the dispersed deposition of the material particles in a sorting chamber 30 of the magnetic separator. 1
  • the D90 value describes the particle size distribution for a grain distribution where 90% by mass is smaller and 10% by mass is larger than the specified diameter of the marginal grain.
  • the means 50 can be constructed in various ways.
  • the means 50 have a vibrating conveyor trough 52 with serrated ends 53.
  • an inlet funnel 54 which is connected to the line to the sorting chamber 30.
  • the serrations 53 at the end of the vibrating conveyor trough 52 serve to ensure that the material particles 5 are well distributed mechanically and are applied as evenly as possible over the entire cross section of the inlet funnel 54.
  • the magnetic separator 1 is operated in the negative pressure to the environment.
  • means 60 are provided for generating a conveying air flow at the end of the magnetic separator 1, as will be described in more detail later. Due to the existing negative pressure in the magnetic separator 1, ambient air is sucked in as conveying air 61 through the inlet funnel 54 into which the material particles 5 are dispersed.
  • Another possibility for the dispersed application of the material particles 5 is, for example, to realize the dispersed application by means of a metering belt and an air conveying trough.
  • Other possibilities are to provide a rotating plate, on which the material particles 5 are given, which is flowed around by air and thus the material particles 5 are occasionally abandoned in the air flow.
  • a siphon-like solution is possible, which essentially corresponds to a direct spraying the bunker exit.
  • a further mixing and dispersion can then be achieved in accordance with changes in direction as well as in the line provided mixer and / or turbulence generating static or dynamic internals. In principle, such static and / or dynamic installations are also possible in the embodiment shown here.
  • an acceleration section 41 is provided with the material particles 5 in the sorting chamber 30 prior to the entry of the conveying air stream 61.
  • This acceleration section 41 is realized essentially by a narrowing of the cross section of the lines and serves for a continuous acceleration of the material particles 5 in the conveying air 61.
  • In the area around the narrowest point of the acceleration section 41 may also impact body, such as cams or offset teeth, and / or a static mixer may be installed to achieve a further dispersion, that is a uniform distribution of the material particles 5 in the conveying air stream 61.
  • the flow rate in the sorting chamber 30 may be adjusted, for example, by the magnitude of the means 60 for generating the conveying air flow, which will be described in more detail below.
  • a diffuser 42 may be mounted before entering the sorting chamber 30.
  • the diffuser 42 can be realized, for example, by widening the delivery cross-section, wherein the angle of the diffuser 42 should be optimally between 4 ° and 6 ° in order to minimize flow separation and / or segregation.
  • the sorting chamber 30 has, as shown, for example, in FIG. 4, a substantially rectangular cross section with rounded or bevelled corners.
  • a longitudinal side of the sorting chamber 30 is limited by a rotating cylinder 10.
  • the magnetic device 20 Inside the cylinder 10 is the magnetic device 20, which is preferably designed as a three-pole magnet 21.
  • the cylinder 10 is advantageously made of a non-magnetizable or hardly magnetizable material, such as aluminum.
  • the magnet device 20 is preferably a three-pole magnet 21.
  • the magnetic device 20 is configured such that it has a central pole 23 and two laterally arranged therefrom further poles 22 and 24, which are opposite to the central pole 23. In other words, the pole of the two outer magnets coincides at the middle pole 23.
  • the embodiment of the magnetic device 20 shown in FIG. 4 is an electromagnet having an iron core 26 and a coil 27 to generate the magnetic field 25.
  • the coil is wound around the middle pole 23.
  • the magnetic field 25 extends essentially along the flow direction in the sorting chamber 30.
  • the width 31 and the depth 32 of the sorting chamber 30 are configured in this way. specifies that the interior of the sorting cannister 30 is filled as completely as possible by the magnetic field 25. This means in particular that the magnetic field 25 within the sorting chamber 30 is strong enough to attract the magnetizable material particles 6.
  • the magnet device 20 itself is located inside the cylinder 10 and is substantially hermetically shielded from the environment. This has the advantage that magnetizable particles 6 can not get directly to the magnet and thus reduce its performance or can pollute it permanently.
  • the magnetizable particles 6 are used on a lateral surface 1 1 of the cylinder 10 by the magnetic field 25 and held.
  • the cylinder 10, which may also be referred to as a drum, is configured such that it can rotate about its longitudinal axis 12.
  • a motor 18 is provided.
  • part of the lateral surface 11, as indicated in FIG. 4 is rotated out of the area of action of the magnetic field 25. This part is located outside of the sorting chamber 30.
  • carrier strips 14 are additionally provided on the lateral surface.
  • a collecting chamber 40 in which the magnetisable particles 6 are collected is then connected to the sorting cannister 30.
  • a rotary valve 47 At the lower end of the collection chamber 40 is, for example, a rotary valve 47 to withdraw the magnetizable particles 6 from the collection chamber 40 without increasing the Falushufeintrag in the magnetic separator 1.
  • the extraction device can also be listed in other ways as long as the false air entry is thereby minimized.
  • the non-magnetizable material particles 7 remain in the sorting chamber 30 and are transported via the conveying air stream 61 in the direction of a dust filter 80.
  • the non-magnetizable material particles 7 are separated from the conveying air stream 61 and can also be removed via a second rotary valve 37 also from the magnetic separator 1.
  • a blower 62 connects, which acts as a means 60 for generating the conveying air flow and sucks air through the magnetic separator 1.
  • FIG. 5 An enlarged view of the region VI of FIG. 5 is shown in FIG. Both figures represent a cross section through a magnetic separator 1 according to the invention.
  • the magnetic separator 1 is operated in the negative pressure to the ambient air.
  • a higher static pressure prevails in the collecting chamber 40 than in the sorting chamber 30.
  • air or gases tend to flow from the collection chamber 40 in the direction of the sorting chamber 30.
  • a sealing area 70 is provided at the point of contact between sorting chamber 30, collecting chamber 40 and lateral surface 11 of cylinder 10. Due to the pressure differences, an air flow from the collecting chamber 40 in the direction of the sorting chamber 30 flows through this sealing region 70. Accordingly, devices such as seals or lips are provided in the sealing region 70, which can minimize or influence the air flow here.
  • a seal 72 is provided at the contact area between the sorting chamber 30 and the collection chamber 40. This is larger, in particular longer, than the distance between two entrainment bars 14, so that in conjunction with the entrainment 14 a kind of chamber with closed air volume is formed, which acts as a lock for the air transfer from the collection chamber 40 into the sorting chamber 30.
  • the distance between the seal 72 and the top of the carrier strip 14 can be adjusted, whereby the air flow from the collection chamber 40 into the sorting chamber 30 can be adjusted.
  • the carrier strips 14 also serve to improve the air seal between the sorting chamber 30 and the collecting chamber 40.
  • the distance between the seals and the entrainment 14 is made adjustable.
  • the air flow 71 which forms counter to the rotational direction 13 of the cylinder 10, can be adjusted.
  • the air flow 71 has the task of blowing off the magnetizable 6 and non-magnetizable 7 material particles adhering to the jacket surface 11 or the driver strips 14 and to blow them back into the sorting chamber 30. In this way, a subsequent cleaning of the material particles 5 can be achieved.
  • the air flow 71 is not set so strong that all material particles 5 are basically blown off.
  • the strength and size of the air flow 71 can be varied by adjusting the seals.
  • an air inlet for the collecting chamber 40 is also provided by means of which the amount of air flowing into the collecting chamber can likewise be varied, so that the air flow 71 can also be influenced as a result.
  • a seal 73 is also provided on the other side of the contact point between the collection chamber 30 and the sorting chamber 40, as shown in Fig. 5. Here the best possible sealing is desired.
  • FIGS. 7 and 8. 7 also shows a schematic representation of a section through a magnetic separator 1 according to the invention, wherein Fig. 8 is an enlarged view of the area VIII of FIG. 7. This again relates to the sealing area 70.
  • cleaning nozzles 65 are provided here, which actively blow air onto the jacket surface 11 of the cylinder 10. This active inflation can be done on the one hand by active blowing, on the other hand it is also possible to suck in the existing negative pressure air is pulled in this direction.
  • the purpose of the additional cleaning nozzles 65 is similar to that of the air flow 71 in which the existing material on the lateral surface 1 1 is blown off and a further cleaning in the sorting chamber 30 is supplied.
  • a device for generating flow rollers 44 is provided in the sorting chamber 30.
  • This device can be designed, for example, in the form of a triangular, angle-adjustable sheet metal or a delta wing. What is essential here is that it generates two flow rolls 45 which move in opposite directions and additionally ensure that material particles 5 which are located within the sorting chamber 30 are conveyed as close as possible to the jacket surface 11 of the cylinder 10 and thus the magnetizable particles 6 the lateral surface 1 1 are used.
  • the conveying air flow 61 in the sorting chamber 30 should be as uniform as possible, in particular laminar. This can be considered in the context of the invention as possible parallel to the drum or magnetic axis, which also includes the flow rollers described above.
  • the flow velocity of the conveying air flow 61 is adjusted so that it corresponds approximately to the free fall speed of the material particles 5 in the collective. This means that a non-dispersed task is assumed.
  • the speed is usually in the range between 3 m / s to 7 m / s.
  • the central features of the magnetic separator 1 according to the invention are that the material particles 5, which are to be separated, are transported in cocurrent with the conveying air 61.
  • the conveying air stream 61 and the rotational direction 13 of the cylinder 10 are aligned substantially perpendicular to each other, so that the magnetizable material particles 6, which create on the lateral surface 1 1 of the cylinder 10, are removed as quickly as possible from the magnetic field 25 and so that the performance of the magnetic device 20 is not affected substantially.
  • the resulting magnetic field 25 would weaken permanently and thus present a worse efficiency of the magnetic separator 1.
  • this can usually only by increasing the width of the drum, increasing the thickness of the permissible material layer of magnetizable particles and / or the Drum speed, that is, the rotational speed can be achieved.
  • the thickness of the material layer on the drum can not be achieved without negative effects on the spreading, the purity and the strength of the magnetic field.
  • it behaves with the speed of the drum. From a certain speed of the drum, the centrifugal force is so great that the attracted material particles are thrown back by the rotation of the drum away and thus can not be promoted by the drum from the magnetic field.
  • the sorting chamber it is possible according to the invention by the sorting chamber to increase in all three directions, length, height and width. If the flow rate in the sorting chamber is kept constant, the throughput of the magnetic separator according to the invention in this case grows quadratically, in contrast to proportionally in the prior art. If the flow velocity can also be increased with increasing plant size, a growth law with an even higher potency results.

Landscapes

  • Combined Means For Separation Of Solids (AREA)
  • Valve-Gear Or Valve Arrangements (AREA)
  • Dry Shavers And Clippers (AREA)
  • Liquid Crystal (AREA)

Abstract

L'invention concerne un séparateur magnétique (1) servant à la séparation sèche de particules de matériau (5) présentant différentes susceptibilités magnétiques. Le séparateur magnétique comprend un cylindre rotatif (10) dans lequel est disposé de manière fixe un dispositif magnétique (20) s'étendant sensiblement sur la longueur du cylindre. Le séparateur magnétique comprend en outre une chambre de tri (30), laquelle s'étend le long d'au moins une partie de la surface externe (11) du cylindre dans la direction périphérique du cylindre et parallèlement à l'axe longitudinal (12) du cylindre. Le séparateur magnétique selon l'invention comprend des moyens (50) servant au chargement dispersé des particules de matériau dans la chambre de tri ainsi que des moyens (60) servant à produire un flux d'air de transport (61) dans la chambre de tri. Le séparateur magnétique comprend en outre un moteur (18) servant à faire tourner le cylindre autour de son axe longitudinal. Lors du fonctionnement, la surface extérieure du cylindre est déplacée par rotation du cylindre sensiblement perpendiculairement à la direction d'écoulement de l'air de transport.
EP17719491.7A 2017-03-29 2017-03-29 Séparateur magnétique Active EP3568237B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2017/057408 WO2018177518A1 (fr) 2017-03-29 2017-03-29 Séparateur magnétique

Publications (2)

Publication Number Publication Date
EP3568237A1 true EP3568237A1 (fr) 2019-11-20
EP3568237B1 EP3568237B1 (fr) 2020-12-09

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Country Status (12)

Country Link
US (1) US11318477B2 (fr)
EP (1) EP3568237B1 (fr)
CN (1) CN110494223B (fr)
AU (1) AU2017406401B2 (fr)
BR (1) BR112019018701B1 (fr)
CA (1) CA3052337A1 (fr)
ES (1) ES2858588T3 (fr)
RU (1) RU2721912C1 (fr)
TW (1) TWI778036B (fr)
UA (1) UA125465C2 (fr)
WO (1) WO2018177518A1 (fr)
ZA (1) ZA201904882B (fr)

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EP3392611B1 (fr) * 2017-04-19 2019-12-25 Renishaw PLC Piège anti-contamination
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AU2017406401A1 (en) 2019-08-15
BR112019018701B1 (pt) 2023-04-04
CN110494223A (zh) 2019-11-22
UA125465C2 (uk) 2022-03-16
ES2858588T3 (es) 2021-09-30
TW201840366A (zh) 2018-11-16
ZA201904882B (en) 2020-02-26
TWI778036B (zh) 2022-09-21
AU2017406401B2 (en) 2022-04-21
EP3568237B1 (fr) 2020-12-09
BR112019018701A2 (pt) 2020-04-07
CA3052337A1 (fr) 2018-10-04
US11318477B2 (en) 2022-05-03
CN110494223B (zh) 2021-05-28
WO2018177518A1 (fr) 2018-10-04
RU2721912C1 (ru) 2020-05-25

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