Magnetic separator having a plurality of inclined magnetic separation boxes

Claim 2

A rotary magnetic separator for separating solid magnetic particles from a fluid current, comprising a rotatable horizontally arranged non-magnetic spider rotor having a plurality of inclined arms sloping outwardly downwardly from the center of the rotor; a plurality of magentic separation boxes arranged on the arms of the spider rotor; a series of flat plates located in each magnetic separation box, said plates having triangular grooves on the lower major surface thereof, the apices of said grooves contacting the upper major surface of the next lower plate; upper and lower U-shaped magnetic pieces; means for supporting the upper magnetic pieces in relation to the lower magnetic pieces to form a pair of air-gaps therebetween and between which said separation boxes pass as the rotor rotates, said air gaps being inclined outwardly downwards to correspond to the inclination of the separation boxes; energizing coils located on the ends of the U-shaped member for providing when energized a magnetic field across the air-gap so as to strongly magnetize the plates of a separation box located therein; and means for rotating said spider rotor in cyclic stepped manner for alternately moving each separation box into a zone of strong magnetic field within the air-gap for fluid current to be fed thereinto and thereafter into a zone of zero magnetic field, located midway between the pair of air-gaps defined by said Ushaped magnetic pieces, for the application of scouring fluid to remove the magnetic particles left adhering to the plates of the separation box.

Claim 3

A rotary magnetic sepparator according to claim 1 wherein said spider rotor is carried on a vertically arranged central shaft which runs in a bearing located on the lower U-shaped magnetic piece and wherein a drive motor and gearbox are mounted on the upper U-shaped member to drive said shaft which extends therethrough.

Claim 4

A rotary magnetic separator for separating solid magnetic particles from a fluid current including a rotatable horizontally arranged solid discoidal magnetic rotor having a central flat circular area, surrounded by a downwardly inclined annular area; a plurality of magnetic separation boxes carried about said annular area of the discoidal rotor; a series of flat plates located in each magnetic separation box, said plates having triangular grooves on the Lower major surface thereof, the apices of said grooves contacting the upper major surface of the next lower plate; a U-shaped magnetic piece having outwardly downwardly inclined ends; means for supporting the U-shaped piece such that the inclined ends thereof are located over diametrically opposite separation boxes thereby forming an air-gap between the top of the separation boxes and the outwardly downwardly inclined ends; energizing coils located at end portions of said U-shaped member for providing a magnetic field across the air-gap to strongly magnetize the plates of a separation box located therein; and means for rotating said discoidal rotor in cyclic stepped manner for each separation box in turn to first be moved into a zone of strong magnetic field within the air-gap and secondly into a zone of substantially zero magnetic field whereby the fluid current containing magnetic particles to be separated therefrom is first fed into the separation box in a zone of strong magnetic field whereafter scouring fluid is fed into the separation box in a zone of substantially zero magnetic field so as to remove the magnetic particles left adhering to the plates of the separation box.

Claim 5

A rotary magnetic separator for separating solid magnetic particles from a fluid current including a rotatable horizontally arranged solid discoidal magnetic rotor having a central flat circular area, surrounded by a downwardly inclined annular area; a plurality of magnetic separation boxes carried about said annular area of the discoidal rotor; a series of flat plates located in each magnetic separation box, said plates having triangular grooves on the Lower major surface thereof, the apices of said grooves contacting the upper major surface of the next lower plate; a U-shaped magnetic piece having outwardly downwardly inclined ends; means for supporting the U-shaped piece such that the inclined ends thereof are located over diametrically opposite separation boxes thereby forming an air-gap between the top of the separation boxes and the outwardly downwardly inclined ends; energizing coils located at end portions of said U-shaped member for providing a magnetic field across the air-gap to strongly magnetize the plates of a separation box located therein; and means for rotating said discoidal rotor in cyclic stepped manner for each separation box in turn to first be moved into a zone of strong magnetic field within the air-gap and secondly into a zone of substantially zero magnetic field whereby the fluid current containing magnetic particles to be separated therefrom is first fed into the separation box in a zone of strong magnetic field whereafter scouring fluid is fed into the separation box in a zone of substantially zero magnetic field so as to remove the magnetic particles left adhering to the plates of the separation box.

Claim 6

A rotary magnetic separator according to claim 3, wherein there are sixteen magnetic separation boxes arranged in equi-spaced relation around the annular area of said discoidal rotor, and wherin two additional zones of strong magnetic field are provided to form additional air-gaps at 90* relationship to said first pair of air-gaps, said four air-gaps each being of such a width that two magnetic separation boxes can be accommodated therein simultaneously whilst a pair of separation boxes on each side thereof is in a zone of zero magnetic field.

Claim 7

A magnetic separator for separating solid magnetic particles from a fluid current including a pair of magnetic separation boxes; a series of flat plates located in each magnetic separation box, said plates having triangular grooves on the lower major surface thereof, the apices of said grooves contacting the upper major surface of the next lower plate; upper and lower U-shaped magnetic pieces; means for supporting the upper magnetic piece in relation to the lower magnetic piece to form a pair of air-gaps therebetween in which the magnetic separation boxes are located in inclined relation to the horizontal; energizing coils carried at end portions of the U-shaped members for providing a magnetic field across the air-gap when said coils are energized thereby to sttrongly magnetize the plates of the separation box for removing magnetic particles from a fluid current, during a fluid current feed cycle, said removed magnetic particles adhering to said plates; a main supply of electric current for said coils for strong magnetization of said plates; means for passing a small electric current reverse to that of said main supply through said coils for reducing the remanent magnetic field to substantially zero when said main supply is interrupted during a scouring period to thereby remove the magnetic particles adhering to the plates of the separation box; and jacking means for raising the upper U-shaped magnetic piece in relation to the lower magnetic piece to facilitate removal of the separation boxes from said air-gaps.

Claim 8

A magnetic separator for separating solid magnetic particles from a fluid current including a pair of magnetic separation boxes; a series of flat plates located in each magnetic separation box, said plates having triangular grooves on the lower major surface thereof, the apices of said grooves contacting the upper major surface of the next lower plate; upper and lower U-shaped magnetic pieces; means for supporting the upper magnetic piece in relation to the lower magnetic piece to form a pair of air-gaps therebetween in which the magnetic separation boxes are located in inclined relation to the horizontal; energizing coils carried at end portions of the U-shaped members for providing a magnetic field across the air-gap when said coils are energized thereby to sttrongly magnetize the plates of the separation box for removing magnetic particles from a fluid current, during a fluid current feed cycle, said removed magnetic particles adhering to said plates; a main supply of electric current for said coils for strong magnetization of said plates; means for passing a small electric current reverse to that of said main supply through said coils for reducing the remanent magnetic field to substantially zero when said main supply is interrupted during a scouring period to thereby remove the magnetic particles adhering to the plates of the separation box; and jacking means for raising the upper U-shaped magnetic piece in relation to the lower magnetic piece to facilitate removal of the separation boxes from said air-gaps.

Claim 9

A magnetic separator according to claim 5, wherein said upper U-shaped magnetic piece is carried by a pair of rods, and wherein an arch-support carries a pair of lifting jacks to which the ends of respective rods are attached.

Claim 10

A magnetic separator according to claim 6, wherein the ttop-plate of the separator box is formed as a piston member having a radially extending peripheral flange, the face of the upper U-shaped magnetic piece bearing on the piston member, a packing member being provided between the walls of the separator box and the piston member, and guide bars being provided to cooperate with the upper U-shaped magnetic piece to prevent it sliding on the inclined surface of the separator boxes.

Claim 11

A magnetic separator according to claim 5, wherein each separator box includes two dividing plates located between the triangular grooved plates so as to divide said plates into three groups within said separator box, said dividing plates being longer than the triangular grooved plates and arranged to extend out of the inlet side of the separator box in an upwardly inclined direction owing to the inclination of the separator box, said dividing plates thus forming together with a chute extending from the base of the separator box, three supply troughs for the three groups of triangular grooved plates.