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
  • B03C1/16—Magnetic separation acting directly on the substance being separated with material carriers in the form of belts
  • B03C1/22—Magnetic separation acting directly on the substance being separated with material carriers in the form of belts 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
  • B03C2201/00—Details of magnetic or electrostatic separation
  • B03C2201/20—Magnetic separation whereby the particles to be separated are in solid form
• • 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 magnetical field, special shape or generation

Definitions

• the present invention relates to a method and a device for separating chips of magnetic material, such as steel, from a mixture of such chips and chips of nonmagnetic material, such as aluminium, in which mixture chips of magnetic material and non-magnetic material, due to their form, hook into each other and interconnect.
• the object of the present invention is to provide a method and a device, which eliminate this problem and thus make it possible to separate chips of magnetic material from chips of non-magnetic material even if these chips are interconnected.
• this object is achieved by a method, in which the chip mixture is supplied to one side of a plane run of an endless conveyor belt, which in this run passes over a fixed magnetic plate, which is arranged at the side of the plane run opposite to said one side close to the plane run and supports a plurality of permanent magnets, which are adapted to retain the chips of magnetic material on the conveyor belt and have such alternating polarity and are positioned in such a manner on the magnetic plate that, as the conveyor belt moves over the magnetic plate, flinging motions are imparted to the chips of magnetic material to release chips of non-magnetic material connected to these chips, and the plane run of the endless conveyor belt is oriented in such a manner that the major part of the chips of nonmagnetic material, which are released from the chips of agnetic material as the conveyor belt moves over the magnetic plate, fall freely from said one side of the plane run without falling back on the conveyor belt.
• a device which is characterised in that an endless conveyor belt, which has a plane run, which is intended to receive the chip mixture at one side thereof, and a mag- netic plate, which is arranged at the side of the plane run opposite to said one side close to the plane run and supports a plurality of permanent magnets, which are adapted to retain the chips of magnetic material on the conveyor belt and have such alternating polarity and are positioned in such a manner on the magnetic plate that, as the conveyor belt moves over the magnetic plate, flinging motions are imparted to the chips of magnetic material to release chips of non-magnetic material connected to these chips, the plane run being oriented such that the major part of the chips of non-magnetic material, which are released from the chips of magnetic material as the conveyor belt moves over the magnetic plate, fall freely from said one side of the plane run without falling back on the conveyor belt.
• the conveyor belt is preferably provided with drivers, which extend transversely of the conveyor belt and are adapted to remove chips of magnetic material which
• the direction of motion of the conveyor belt suitably forms an angle of 30°-60° with the horizontal plane.
• the plane of the plane run is advantageously inclined in relation to the vertical plane in the direction of said one side.
• Fig. 1 is a side view schematically showing a device according to the invention.
• Fig. 2 shows the device in the direction of the arrow II in Fig. 1.
• Fig. 3 is a top plan view showing on a larger scale a magnetic plate arranged in the device according to Figs 1 and 2.
• the device shown in Figs 1 and 2 has a frame (not shown) , which supports an upper cylinder 1 and a parallel lower cylinder 2.
• a motor (not shown) is arranged to ro- tate the upper cylinder 1.
• An endless conveyor belt 3 in the form of a rubber sheeting having a profiled outside extends over the two cylinders 1 and 2.
• the conveyor belt 3 is driven in the direction of the arrow P by the upper cylinder 1 driven by the motor.
• the conveyor belt 3 has a first plane run 3a and a parallel second plane run 3b between the two cylinders 1 and 2.
• the conveyor belt 3 On its outside, the conveyor belt 3 has a plurality of ribs 4, which extend transversely of the conveyor belt along its entire width.
• a magnetic plate 5 which supports a plurality of permanent magnets, is arranged between and parallel with the two plane runs 3a and 3b.
• the magnetic plate 5 is arranged close to the first plane run 3a and extends along the major part of its width and length (see Fig. 1) .
• the conveyor belt 3 is inclined such that its direction of motion P forms an angle with the horizontal plane (see Fig. 1) .
• this angle ⁇ is about 40° but can vary within a range of suitably 30°- 60°.
• the plane of the first run 3a is inclined in the direction of the outside of the first run at an angle ⁇ to the vertical plane (see Fig. 2) .
• this angle ⁇ is about 10° but can vary within a range of suitably 0°-90°.
• a substantially horizontal vibrator conveyor 6 is adapted to convey a mixture 7 of turning and/or milling chips 8 of magnetic material, such as steel, and turning and/or milling chips 9 of non-magnetic material, such as aluminium, to the first run 3a of the conveyor belt 3.
• These chips 8, 9 are supplied from a chip crusher (not shown) , in which chips originating from turning and milling operations have been crushed into a size of about 1 mm - 20 mm.
• the vibrator conveyor 6 ends at a distance from the first run 3a of the conveyor belt 3, but since it is located, seen from the side as shown in Fig. 1, within the area of the magnetic plate 5, the chips 8 of magnetic material and the chips 9 of non-magnetic material connected thereto are supplied, by magnetic effect, to the first run 3a.
• the chips 9 of non-magnetic material which are not connected to any chip or chips 8 of magnetic material fall down into a first container 10, which is placed under the conveyor belt 3 and which is intended for chips 9 of non-magnetic material.
• a second container 11, which is intended for chips 8 of magnetic material, is placed under the conveyor belt 3, seen in the direction of motion P, in front of the first container 10.
• a certain degree of inclination ⁇ is required to utilise at least part of the width of the conveyor belt 3 when transferring the mixture 7 from the vibrator conveyor 6. If ⁇ was 0°, i.e. the direction of motion P was horizontal, naturally only a limited part of the width of the conveyor belt 3 would be utilised, at least initially, that is the part corre- sponding to the height of the mixture 7 of chips 8, 9 which is present on the vibrator conveyor 6.
• the magnetic plate 5 On its side facing away from the first run 3a, the magnetic plate 5 has a steel plate 5a, on which the per- manent magnets are positioned, and on its side facing the first run 3a a plate 5b of stainless steel .
• the permanent magnets are positioned between these plates 5a and 5b.
• the permanent magnets are blocks, which have a right-angled parallelepipedic shape and which are arranged in parallel rows 12 that extend in the transverse direction of the conveyor belt 3 at a distance from each other in its longitudinal direction and are distributed over the entire surface of the magnetic plate 5.
• the magnets are of the kind which are sometimes referred to as "super mag- nets" and, in this case, they are magnets marketed under the trade name Neodymium. The magnets are retained on the magnetic plate 5 by their powerful magnetic effect.
• the permanent magnets are arranged in three groups distributed along the magnetic plate 5, that is a first group I, a second group II located downstream of said first group and a third group III located downstream of said second group.
• the magnet blocks are arranged adjacent to each other to form rows 12 with alternating polarity (N and S) .
• the distance between the rows 12 in the first group I which is somewhat smaller than the distance between the rows 12 in the second group II, is adjusted to the size of the smaller chips 8 of magnetic material in the mixture 7 which are to be separated, whereas the distance between the rows 12 in the second group II is adjusted to the size of the larger chips 8 of magnetic material in the mixture 7 which are to be separated.
• the chips 8 and 9 have, as already mentioned, a size of about 1 mm - 20 mm.
• the distance between the rows 12 of the first group I and between the rows 12 of the second group II is 3 mm and 10 mm, respectively, whereas the extension of the magnet blocks in the longitudinal direction of the conveyor belt 3 is about 30 mm.
• the distance between the rows 12 is the same as in the second group II, but the blocks in each row are not arranged adjacent to each other but at a distance from each other, which is substantially the same as the distance between the rows 12.
• the blocks in one and the same row 12 have alternating polarity (N and S) .
• Blocks located opposite to each other in the different rows 12 of the third group III also have alternating polarity (N and S) .
• chips 8 and 9 When chips 8 and 9 have been supplied to the first plane run 3a of the conveyor belt 3, they are conveyed in the direction of motion P. Owing to the fact that the permanent magnets are positioned in the above-described manner and have the above-described alternating polarity, flinging motions are imparted to the chips 8 of magnetic material as the conveyor belt 3 moves over the magnetic plate 5, such that chips 9 of non-magnetic material connected to these chips 8 are released. The chips 9 of nonmagnetic material which have been released in this manner fall down into the container 10.
• Chips 8 of magnetic material successively gather at the upstream edge of the magnetic plate 5, i.e. they do not pass said edge of the conveyor belt 3.
• chips 8 of magnetic material are hit by a rib 4, they are thrown away batchwise from the conveyor belt 3 and gath- ered in the container 11.

Landscapes

• Belt Conveyors (AREA)
• Non-Mechanical Conveyors (AREA)
• Processing Of Solid Wastes (AREA)

Applications Claiming Priority (3)

Publications (1)

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ID=20418155

Family Applications (1)

Country Status (4)

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Family Cites Families (2)

• 1999
  • 1999-12-16 SE SE9904613A patent/SE518215C2/sv not_active IP Right Cessation
• 2000
  • 2000-12-11 AU AU22437/01A patent/AU2243701A/en not_active Abandoned
  • 2000-12-11 WO PCT/SE2000/002476 patent/WO2001043879A1/en not_active Application Discontinuation
  • 2000-12-11 EP EP00986146A patent/EP1237658A1/en not_active Withdrawn

Non-Patent Citations (1)

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