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WO2015052368A1 - Procédé et dispositif pour séparer des particules faiblement magnétiques - Google Patents

Procédé et dispositif pour séparer des particules faiblement magnétiques Download PDF

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Publication number
WO2015052368A1
WO2015052368A1 PCT/FI2014/000025 FI2014000025W WO2015052368A1 WO 2015052368 A1 WO2015052368 A1 WO 2015052368A1 FI 2014000025 W FI2014000025 W FI 2014000025W WO 2015052368 A1 WO2015052368 A1 WO 2015052368A1
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WO
WIPO (PCT)
Prior art keywords
mixture
particles
conveyor belt
magnetic field
movement
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.)
Ceased
Application number
PCT/FI2014/000025
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English (en)
Inventor
Niklas Erik Tomasson TÖRNKVIST
Pekka Suominen
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.)
MAGSORT Oy
Original Assignee
MAGSORT Oy
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Filing date
Publication date
Application filed by MAGSORT Oy filed Critical MAGSORT Oy
Publication of WO2015052368A1 publication Critical patent/WO2015052368A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • B03C1/025—High gradient magnetic separators
    • B03C1/031—Component parts; Auxiliary operations
    • B03C1/033—Component parts; Auxiliary operations characterised by the magnetic circuit
    • B03C1/0332—Component parts; Auxiliary operations characterised by the magnetic circuit using permanent 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
    • B03C1/025—High gradient magnetic separators
    • B03C1/031—Component parts; Auxiliary operations
    • B03C1/033—Component parts; Auxiliary operations characterised by the magnetic circuit
    • B03C1/0335—Component parts; Auxiliary operations characterised by the magnetic circuit using coils
    • 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
    • B03C1/04—Magnetic separation acting directly on the substance being separated with the material carriers in the form of trays or with tables
    • B03C1/06—Magnetic separation acting directly on the substance being separated with the material carriers in the form of trays or with tables with magnets moving during operation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C—MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C1/00—Magnetic separation
    • B03C1/02—Magnetic separation acting directly on the substance being separated
    • B03C1/16—Magnetic separation acting directly on the substance being separated with material carriers in the form of belts
    • B03C1/18—Magnetic separation acting directly on the substance being separated with material carriers in the form of belts with magnets moving during operation
    • 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
    • B03C1/23—Magnetic separation acting directly on the substance being separated with material carried by oscillating fields; with material carried by travelling fields, e.g. generated by stationary magnetic coils; Eddy-current separators, e.g. sliding ramp
    • B03C1/24—Magnetic separation acting directly on the substance being separated with material carried by oscillating fields; with material carried by travelling fields, e.g. generated by stationary magnetic coils; Eddy-current separators, e.g. sliding ramp with material carried by travelling fields
    • B03C1/247—Magnetic separation acting directly on the substance being separated with material carried by oscillating fields; with material carried by travelling fields, e.g. generated by stationary magnetic coils; Eddy-current separators, e.g. sliding ramp with material carried by travelling fields obtained by a rotating magnetic drum
    • 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
    • B03C1/23—Magnetic separation acting directly on the substance being separated with material carried by oscillating fields; with material carried by travelling fields, e.g. generated by stationary magnetic coils; Eddy-current separators, e.g. sliding ramp
    • B03C1/24—Magnetic separation acting directly on the substance being separated with material carried by oscillating fields; with material carried by travelling fields, e.g. generated by stationary magnetic coils; Eddy-current separators, e.g. sliding ramp with material carried by travelling fields
    • B03C1/253—Magnetic separation acting directly on the substance being separated with material carried by oscillating fields; with material carried by travelling fields, e.g. generated by stationary magnetic coils; Eddy-current separators, e.g. sliding ramp with material carried by travelling fields obtained by a linear motor
    • 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 of bulk or dry particles in mixtures
    • 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
    • B03C2201/22—Details of magnetic or electrostatic separation characterised by the magnetic field, e.g. its shape or generation

Definitions

  • the present disclosure relates to a device and to a method for separating particles having positive magnetic susceptibility from mixture comprising the particles and nonmagnetic other particles.
  • the particles having the positive magnetic susceptibility can be for example hematite, ilmenite or pyrrhotite.
  • iron oxides include magnetite Fe 3 0 4 , hematite Fe 2 C>3, goethite FeO(OH), limonite FeO(OH) n(H 2 0) and siderite FeCCb.
  • the iron extraction process includes enriching the iron ore.
  • the enriching process entails separation of the iron ore from unusable materials. Because most of the iron ores are magnetic in nature, the separation process is performed using magnetic separation techniques with the aid of which the iron ores are purified to a stage from where other metallurgical processes can be used to obtain pure iron.
  • Typical magnetic separation processes cannot be used for separating paramagnetic materials such as hematite Fe 2 C>3, ilmenite FeTi03 and pyrrhotite that has a repeating unit Fei -x S where x is from 0 to 0.2. Since the paramagnetic materials are only weakly magnetic, many conventional separation methods based on magnetic properties of minerals cannot be used for separating paramagnetic materials from other mining materials.
  • magnetation One process suitable for separating hematite is known as magnetation.
  • the material comprising hematite is crushed and mixed with water to create slurry.
  • the slurry is then pumped through magnetic separation chambers to separate hematite.
  • Commercial interest in this process stems from the possibility of extracting additional iron from tailings supplied by existing mines, thus increasing the yield of the mines.
  • the magnetation has its shortcomings. The magnetation requires a large setup involving machines for mixing the crushed material with water to create slurry and for pumping the slurry through the magnetic separation chambers. Requirement of a large setup increases the costs of performing the separation process.
  • the costs are also high because magnetic flux densities significantly over 1 T are needed in the magnetic separation chamber and thus there is a need for powerful electromagnets which require a high capacity electric current supply and sufficient cooling. This, in turn, leads to an increase in the costs of iron produced from iron ore enriched using the magnetation. Further, the magnetic separation chambers through which the slurry is passed need continual cleansing for functioning efficiently. The continual cleansing leads to high maintenance cost of the magnetation setup.
  • a new a device for separating first particles having positive magnetic susceptibility from mixture comprising the first particles and nonmagnetic second particles.
  • the first particles can be, for example but not necessarily, hematite, ilmenite or pyrrhotite and the second particles can be for example quartz sand.
  • a device according to the invention comprises:
  • the magnetizing equipment and the carrier equipment are adapted to produce the magnetic field and to carry the mixture, respectively, so that mutually opposite polarity portions of the magnetic field are adapted to sweep the mixture in a sweeping direction and thereby deflect the direction of movement of the first particles towards the sweeping direction and away from the direction of movement of the second particles so that the deflected direction of movement of the first particles intersects the sweeping direction.
  • the deflected direction of movement of the first particles makes it possible to receive the first and second particles with separate collectors.
  • a method for separating first particles having positive magnetic susceptibility from mixture comprising the first particles and nonmagnetic second particles.
  • a method according to the invention comprises:
  • the producing the magnetic field and the moving the mixture with respect to the magnetic field are carried out so that mutually opposite polarity portions of the magnetic field sweep the mixture in a sweeping direction and thereby deflect the direction of movement of the first particles towards the sweeping direction and away from the direction of movement of the second particles so that the deflected direction of movement of the first particles intersects the sweeping direction.
  • figure la shows a schematic side view of a device according to an exemplifying and non-limiting embodiment of the invention for separating particles having positive magnetic susceptibility from nonmagnetic particles
  • figure lb shows a schematic top view of the device illustrated in figure la
  • figure lc shows a schematic view of a section taken along a line A-A shown in figure la
  • figure 2 illustrates a device according to another exemplifying and non-limiting embodiment of the invention for separating particles having positive magnetic susceptibility from nonmagnetic particles
  • figure 3 illustrates a device according to an exemplifying and non-limiting embodiment of the invention for separating particles having positive magnetic susceptibility from nonmagnetic particles
  • figures 4a and 4b illustrate a device according to an exemplifying and non-limiting embodiment of the invention for separating particles having positive magnetic susceptibility from nonmagnetic particles
  • figure 5 shows a flowchart
  • Figure la shows a schematic side view of a device according to an exemplifying and non-limiting embodiment of the invention.
  • Figure lb shows a schematic top view of the device.
  • figure lb shows schematically mixture 112 which comprises first particles having positive magnetic susceptibility, ⁇ > 0, and nonmagnetic second particles.
  • the first particles can be, for example but not necessarily, hematite, ilmenite or pyrrhotite and the second particles can be for example quartz sand.
  • the first particles are presented as white circles one of which is denoted with a reference number 113 and the second particles are presented as black circles one of which is denoted with a reference number 114.
  • Figure lc shows a schematic view of a section taken along a line A-A shown in figure la.
  • the section plane is parallel with the xz-plane of a coordinate system 199.
  • the device comprises magnetizing equipment 101 for producing magnetic field acting on the mixture 112 and carrier equipment 102 for carrying the mixture so that the mixture is adapted to move with respect to the magnetic field.
  • the magnetizing equipment 101 comprises rotatable elements 103, 104, 105 and 106.
  • each of the rotatable elements 103-106 comprises permanent magnets having radially directed magnetic axes.
  • one of the permanent magnets of the rotatable element 104 is denoted with a reference number 115.
  • the permanent magnets can be embedded to a support matrix made of non-ferromagnetic material for example aluminum.
  • a part of the support matrix of the rotatable element 104 is denoted with a reference number 116 in figure lc.
  • each rotatable element further comprises a ferromagnetic core and a support band for supporting and protecting the permanent magnets.
  • the core of the rotatable element 104 is denoted with a reference number 117 and the support band of the rotatable element 104 is denoted with a reference number 118.
  • the support band can be made of for example carbon fiber or metal.
  • the carrier equipment 102 comprises a conveyor belt 109 driven with an electrical motor 119.
  • the longitudinal direction of the conveyor belt 109 is substantially parallel with a rotation axis of each of the rotating elements 103-106.
  • the conveyor belt is adapted to receive the mixture 112 from a feed box 120 and to move the mixture so that the mixture is a distance away from magnetizing equipment producing the magnetic field, i.e. the mixture does not touch the rotatable elements 103-106.
  • the direction of the movement of the conveyor belt 109 is depicted with an arrow 130 in figure lb.
  • the device comprises advantageously a support structure 121 with the aid of which it is possible to adjust the vertical, i.e. the z-directional, distance between the conveyor belt 109 and the rotating elements 103-106.
  • the rotatable elements 103 and 105 constitute first co-axial rotatable elements which are driven with an electrical motor 122, and the rotatable elements 104 and 106 constitute second co-axial rotatable elements which are driven with an electrical motor 123, as shown in figure lb.
  • the first and second rotatable elements are adjacent to each other in the transversal direction of the conveyor belt 109, i.e. the in the x-direction of the coordinate system 199.
  • the first and second rotatable elements are adapted to rotate in mutually opposite rotational directions as illustrated with arrows 124 and 125 in figure lc.
  • all the rotatable elements 103-106 are driven with only one motor and with a power transmission arrangement comprising gear wheels, a chain and chain wheels, and/or a belt and belt pulleys.
  • a power transmission arrangement comprising gear wheels, a chain and chain wheels, and/or a belt and belt pulleys.
  • a loop line 138 shown in figure lc illustrates an exemplifying flux line of the magnetic field produced by the rotatable element 104.
  • a part 128 of the loop line represents such a portion of the magnetic field which has polarity so that the field acting on the mixture 112 is substantially upwards, i.e. in the positive z-direction of the coordinate system 199.
  • a part 129 of the loop line represents such a portion of the magnetic field which has opposite polarity so that the field acting on the mixture 112 is substantially downwards, i.e.
  • the magnetic field produced by the rotatable elements 103 and 105 sweeps the mixture 112 in a sweeping direction illustrated with an arrow 127 shown in figures lb and lc.
  • the magnetic field produced by the rotatable elements 104 and 106 sweeps the mixture 112 in a sweeping direction illustrated with an arrow 126 shown in figures lb and lc.
  • the sweeping magnetic field produced by the rotatable elements 103 and 105 deflect the direction of movement of a first portion of the first particles obliquely towards a first longitudinal edge of the conveyor belt 109.
  • the sweeping magnetic field produced by the rotatable elements 104 and 106 deflect the direction of movement of a second portion of the first particles obliquely towards the second longitudinal edge of the conveyor belt 109.
  • the deflected directions of movement of the first particles make it possible to receive the first particles at collectors 131 and 132 as illustrated in figure lb.
  • the second particles whose direction of movement is not deflected are received at a collector 133.
  • the separation of the first particles from the mixture is based on directing magnetic forces to the first particles, the separation is most effective to those of the first particles which are most free, i.e. least hindered by other particles, to move in response to the magnetic forces.
  • Those of the first particles which are located topmost on the trail of the mixture on the conveyor belt 109 are inherently those of the first particles which are most free to be moved by the sweeping magnetic fields.
  • the freedom of all the first particles to move can be increased by agitating the mixture so as to cause the first and second particles to be stirred on the surface of the conveyor belt 109.
  • a particle belonging to the first particles is e.g. bouncing due to the stirring, the particle is free to be moved at least a short distance by the sweeping magnetic field.
  • the separation process can be tuned by adjusting the rotational speeds of the rotatable elements 103-106, by adjusting the speed of movement of the conveyor belt 109, and by adjusting the strength of the magnetic fields acting on the mixture.
  • the strength of the magnetic fields can be adjusted by adjusting the vertical distance between the rotatable elements and the conveyor belt. The vertical distance is advantageously so long that the first particles do not stick on the rotatable elements.
  • the peak value of the magnetic flux density acting on the mixture can be for example from 0.01 T to 0.5 T.
  • the support band 118 can be designed to be so thick that a particle belonging to the first particles does not get captured by the rotatable element even if the particle were thrown towards the rotatable element due to the agitation of the mixture.
  • the exemplifying device illustrated in figures la-lc comprises advantageously an agitator 110 for agitating the conveyor belt 109 so as to cause the first and second particles to be stirred on the upper surface of the conveyor belt.
  • the agitator 110 comprises ferromagnetic elements adapted to agitate the conveyor belt in response to being shaken by the magnetic field produced by the magnetizing equipment and alternating with respect to the ferromagnetic elements.
  • the ferromagnetic elements can be for example flexible wires or strips of ferromagnetic material which are shaken by the magnetic field alternating with respect to the wires or strips and which in turn agitate the conveyor belt.
  • one of the ferromagnetic elements is denoted with a reference number 111.
  • Figure 2 illustrates a device according to another exemplifying and non-limiting embodiment of the invention for separating first particles having positive magnetic susceptibility from mixture 212 comprising the first particles and nonmagnetic second particles.
  • Figure 2 shows a schematic view of a section taken from the device in the same way as figure lc shows the schematic view of the section taken along the line A-A shown in figure la.
  • the device illustrated in figure 2 comprises magnetizing equipment 201 for producing magnetic field acting on the mixture, and carrier equipment 202 for carrying the mixture so that the mixture is adapted to move with respect to the magnetic field.
  • the carrier equipment 202 comprises a conveyor belt 209 for moving the mixture 212 in the y- direction of a coordinate system 299.
  • the magnetizing equipment 201 is adapted to produce the magnetic field so that mutually opposite polarity portions of the magnetic field are adapted to sweep the mixture in a sweeping direction which is depicted with arrows 226 in figure 2.
  • the sweeping magnetic field deflects the direction of movement of the first particles towards the sweeping direction and away from a direction of movement of the second particles, i.e. away from the y- direction of a coordinate system 299.
  • the magnetizing equipment 201 comprises an electromagnet 207 that has a multiphase winding 208.
  • the electromagnet 207 produces the above-mentioned sweeping magnetic field when multiphase alternating electrical current is supplied to the multiphase winding 208.
  • a loop line 238 illustrates an exemplifying flux line of the magnetic field produced by the electromagnet 207.
  • the multiphase winding 208 is a 3-phase winding and the multiphase alternating electrical current is 3-phase alternating electrical current.
  • the 3-phase winding can be in principle similar to a stator winding of a 3-phase alternating current electrical motor.
  • the one or more rotatable permanent magnet elements can be on one side of the conveyor belt and the one or more electromagnets can be on the other side of the conveyor belt.
  • the exemplifying device illustrated in figure 2 comprises advantageously an agitator for agitating the conveyor belt 209 so as to cause the first and second particles to be stirred on the upper surface of the conveyor belt.
  • the agitator comprises ferromagnetic elements adapted to agitate the conveyor belt in response to being shaken by the magnetic field produced by the electromagnet 207.
  • one of the ferromagnetic elements is denoted with a reference number 211.
  • Figure 3 illustrates a device according to an exemplifying and non-limiting embodiment of the invention for separating first particles having positive magnetic susceptibility from mixture comprising the first particles and nonmagnetic second particles.
  • the device comprises magnetizing equipment 301 for producing magnetic field acting on the mixture, and carrier equipment 302 for carrying the mixture so that the mixture is adapted to move with respect to the magnetic field.
  • the magnetizing equipment 301 is adapted to produce the magnetic field so that mutually opposite polarity portions of the magnetic field are adapted to sweep the mixture in a sweeping direction which is depicted with an arrow 326 in figure 3.
  • the sweeping magnetic field deflects the direction of movement of the first particles towards the sweeping direction and away from the direction of movement of the second particles.
  • the moving path of the first particles is depicted with a curved arrow 340, and the moving path of the second particles is depicted with a curved arrow 341.
  • the carrier equipment 302 comprises a sliding surface for allowing the gravity force to move the mixture.
  • the magnetizing equipment 301 comprises a wheel provided with permanent magnets which produce the above-mentioned sweeping magnetic field when the wheel is rotated according to an arrow 330 shown in figure 3.
  • Figures 4a and 4b illustrate a device according to an exemplifying and non-limiting embodiment of the invention for separating first particles having positive magnetic susceptibility from mixture comprising the first particles and nonmagnetic second particles.
  • the device comprises magnetizing equipment 401 for producing magnetic field acting on the mixture, and carrier equipment 402 for carrying the mixture so that the mixture is adapted to move with respect to the magnetic field.
  • the carrier equipment 402 comprises a conveyor belt 409 for moving the mixture in the positive y-direction of a coordinate system 499.
  • the magnetizing equipment 401 comprises a plurality of bar-shaped permanent magnets whose magnetic axes are substantially perpendicular to the conveyor belt 409.
  • the permanent magnets are positioned obliquely with respect to the moving direction of the conveyer belt, i.e. obliquely with respect to the y-direction of the coordinate system 499.
  • the north- pole "N" of every second of the permanent magnets is towards the part of the conveyor belt carrying mixture and the south-poles "S" of the rest of the permanent magnets are towards the part of the conveyor belt carrying mixture.
  • the magnetic field produced by the permanent magnets sweeps the mixture in a sweeping direction which is depicted with an arrow 426 in figures 4a and 4b.
  • the sweeping magnetic field deflects the direction of movement of the first particles towards the sweeping direction and away from a direction of movement of the second particles, i.e. away from the y- direction of a coordinate system 499.
  • the moving path of the first particles is depicted with a curved arrow 440, and the moving path of the second particles is depicted with a curved arrow 441.
  • Figure 5 shows a flowchart of a method according to an exemplifying and non- limiting embodiment of the invention for separating first particles having positive magnetic susceptibility from mixture comprising the first particles and nonmagnetic second particles.
  • the method comprises the following actions:
  • - action 501 moving the mixture with respect to the magnetic field,
  • the producing the magnetic field and the moving the mixture with respect to the magnetic field are carried out so that mutually opposite polarity portions of the magnetic field sweep the mixture in a sweeping direction and thereby deflect the direction of movement of the first particles towards the sweeping direction and away from the direction of movement of the second particles so that the deflected direction of movement of the first particles intersects the sweeping direction.
  • the magnetic field whose mutually opposite polarity portions sweep the mixture is at least partly produced with one or more rotating elements each comprising permanent magnets having radially directed magnetic axes.
  • the magnetic field whose mutually opposite polarity portions sweep the mixture is at least partly produced with one or more electromagnets each having a multiphase winding supplied with multiphase alternating electrical current.
  • the mixture is moved with a conveyor belt.
  • the mixture is moved by allowing the gravity force to move the mixture along a sliding surface.
  • the mixture is moved with a conveyor belt and the longitudinal direction of the conveyor belt is substantially parallel with a rotation axis of each of one or more rotating elements which produce the magnetic field whose mutually opposite polarity portions sweep the mixture.
  • the rotating elements comprise at least one first rotating element and at least one second rotating element so that the first and second rotating elements are adjacent to each other in a transversal direction of the conveyor belt and rotate in mutually opposite rotational directions so as to deflect the direction of movement of a first portion of the first particles obliquely towards a first longitudinal edge of the conveyor belt and the direction of movement of a second portion of the first particles obliquely towards a second longitudinal edge of the conveyor belt.
  • the mixture is moved with a conveyor belt and the longitudinal direction of the conveyor belt is substantially perpendicular to directions of magnetic axes of a multiphase winding of each of one or more electromagnets which produce the magnetic field whose mutually opposite polarity portions sweep the mixture.
  • a method according to an exemplifying and non-limiting embodiment of the invention further comprises agitating the mixture.
  • the mixture can be agitated for example with the aid of one or more ferromagnetic elements shaken by the magnetic field alternating with respect to the ferromagnetic elements.
  • a peak value of the magnetic flux density acting on the mixture is from 0.01 T to 0.5 T.
  • the material of the first particles is material selected from a group consisting of: hematite, ilmenite and pyrrhotite.

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  • Electrostatic Separation (AREA)

Abstract

Cette invention concerne un dispositif pour séparer des premières particules faiblement magnétiques, par exemple, les particules d'hématite, d'un mélange (112) comprenant lesdites premières particules (113) et des secondes particules non magnétiques (114). Le dispositif comprend un équipement (101, 102) pour créer un champ magnétique et pour déplacer le mélange de façon que des parties à polarités mutuellement opposées (N, S) du champ magnétique balaient le mélange dans un sens de balayage et dévient ainsi le sens de déplacement des premières particules en direction du sens de balayage et les éloignent du sens de déplacement des secondes particules. Le sens de déplacement dévié des premières particules permet de recevoir les premières et les secondes particules dans des collecteurs séparés.
PCT/FI2014/000025 2013-10-10 2014-10-06 Procédé et dispositif pour séparer des particules faiblement magnétiques Ceased WO2015052368A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US201361889360P 2013-10-10 2013-10-10
US61/889,360 2013-10-10
US201461930289P 2014-01-22 2014-01-22
US61/930,289 2014-01-22

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WO2015052368A1 true WO2015052368A1 (fr) 2015-04-16

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016166410A1 (fr) * 2015-04-14 2016-10-20 Magsort Oy Dispositif et procédé pour séparer des particules faiblement magnétiques
CN114749272A (zh) * 2022-04-18 2022-07-15 湖南中科电气股份有限公司 一种废钢磁选系统及方法
CN115646645A (zh) * 2022-12-26 2023-01-31 潍坊工程职业学院 一种用于含铁矿物筛选的转动电磁分离设备
EP4368292A1 (fr) * 2022-11-14 2024-05-15 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Dispositif et procédé de séparation de particules de poudre ferromagnétiques de particules de poudre non-ferromagnétique mélangées à celles-ci

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