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
  • B03C1/23—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
  • B03C2201/00—Details of magnetic or electrostatic separation
  • B03C2201/20—Magnetic separation of bulk or dry particles in mixtures

Definitions

• the invention has for its object to provide a device that ensures the targeted discharge of the conductive particles from the alternating magnetic field, without the above-mentioned disadvantages must be taken into account.
• an eddy current separator is formed with a delivery medium and at least one exciter for an alternating magnetic field.
• the Wirbelstromabscheider further comprises at least one discharge, which detects the repelled particles from the alternating magnetic field and transported away or deflected from its trajectory.
• FIG. 10 representation of a detail of the second, third and fourth
• FIGS. 3 to 8 show various embodiments of an eddy-current separator with a delivery medium and at least one exciter 5 shown for a magnetic alternating field.
• the eddy current separator comprises at least one discharge means, which detects the particles repelled by the alternating magnetic field and removes them or diverts them from their trajectory.
• the discharge can also be referred to as Austragshne.
• the brush 32 or the brush roller 32 is designed to rotate.
• the brush or brush roller 32 rotates in such a way that the movement to the conveying medium 2 is synchronous.
• the rotating brush roller can be spoken of an active discharge. The particles are detected by the bristles of the brush 32 and laterally thrown over the separating blade 6, so that they are transferred to concentrate 8.
• the discharge is as stated in the form of a rotating brush or brush roller 32 executed. Brush rollers have proven particularly useful because the bristles can avoid oversized, lying on the tape, non-conductive particles and thus the risk of grits between the conveyor belt and discharge device is prevented.
• the brush 32 and the brush roller 32 is stationary or substantially stationary or stationary to the conveying medium 2.
• This discharge can also be referred to as a passive discharge.
• the passive discharge has a positive effect on the separation result, especially by avoiding the erroneous jumps described above in connection with FIG.
• FIG. 3 embodiment shown a significant improvement of the separation result, even if the brush stood still. Particles that jump vertically above the flywheel 5 bounce off the bristles of the discharge aid 32 designed as a brush, fall perpendicularly back onto the belt and thus again have the opportunity to "jump off” and thus to discharge correctly into the concentrate 8.
• FIG. 4 shows a second embodiment of the dispensing means.
• the discharge means has the shape of a suction device 18.
• the suction device 18 detects the jump over the flywheel 5 particles and leads them into the concentrate 8. Particles that jump vertically above the flywheel 5, get into the catchment area of the suction device 18 and are deposited via an aero-cyclone 21, the suction side in front of a fan 20th is installed. The separation of the particles from the air stream could also done differently.
• suction device such devices are understood in which the high-jumping material particles are detected and removed by an air flow.
• a blowing device or an air knife which blows the high-jumping particles with a sharp air flow eg laterally, can represent a suction device.
• the diffuser ensures that the intake region 18b of the suction device 18 is level and parallel to the surface 33, and only the The lower edge is detected by the suction device via this plane
• the diffuser is typically located less than 150 mm above the conveyor belt, which limits the processable grain size accordingly.
• An advantage of the second embodiment is that conventional belt eddy current separators can be retrofitted with a suction device 18. Experiments have shown that in the eddy current sorting of small particles can be achieved by the additional attachment of a suction device, an increase in the application of conductive particles of about 2-5%.
• the suction device 18 can stand alone or in combination with the brush or the brush roller 32 according to the first embodiment be used.
• the discharge means in this case comprises the brush roller 32, an intake passage 19, a blower 20 and a separation cyclone 21.
• Intake channel 19, blower 20 and separation cyclone 21 here form the suction device 18.
• the high above the flywheel 5 particles are detected by the brush roller 32, advised from there into the suction device 18 and are finally transferred via the separation cyclone 21 into the concentrate 8.
• the suction device has the advantage that in the eddy-current sorting of small particles (0.5-6 mm), the additional application of such a discharge aid results in an increase in the application of conductive particles to about 10%.
• the blowing device 25 can be used alone as the sole discharge means or in combination with the suction device 19, as shown in FIG. Here, the air flow of the blowing device 25 is directed substantially to the intake passage 19.
• the brush or the brush roller 32 according to the first or the second embodiment may also be arranged. Consequently, the discharge means then consists of the Suction device 18, the blowing device 25 and the brush or the brush roller 25th
• the eddy current separator comprises a plurality of exciters, here in the form of pole wheels 5, 14.
• the pole wheels are arranged here below the conveying path of the conveying medium 2 and ensure that the particles jump up from the conveying medium 2.
• the plurality of pole wheels 5, 14 are arranged transversely below the conveying medium, which here has the shape of a conveyor belt.
• such a device is shown in two-stage design.
• the material is conveyed via a first flywheel 14 and then via a second flywheel 5.
• Small conductive particles are z. B. deposited over the front fast-running flywheel 14, while large particles are separated with the slower running rear flywheel 5.
• a discharge means is arranged here above the front rotor 14.
• the dispensing means is shown here as a suction device 19, but could also be in the form of another dispensing means described in connection with the embodiments described herein. In other variants, also discharge means described herein can be arranged in the region of the rear pole wheel 5.
• pole wheels 5, 14 The arrangement of two pole wheels 5, 14 a greater efficiency is achieved.
• the spreading is increased if the conductive particles pass through a plurality of pole wheels 5, 14 one after the other and thus have several opportunities to get into the concentrate.
• the pole wheels 5, 14 by adapting Polraddesign and running speed to different Materials and grain sizes are optimized. Large conductive particles would z. For example, in the embodiment shown in FIG. 2, it is deposited over the front low-speed flywheel, while small particles are separated with the fast-running rear flywheel.
• the high quality of the concentrate obtained by means of the discharge aid 19 above the rotor 14 is noteworthy, since the discharge aid only detects conductive particles, ie only those that jump up.
• the discharge means acts with electrostatic forces on the particles.
• FIG. 7 shows a fifth embodiment of an eddy current separator.
• the discharge is stationary or stationary with respect to the pumped medium. It can also be spoken of a passive discharge.
• the passive discharge means in the form of a broom 17 is shown.
• the broom 17 is installed here above the flywheel 5 transversely to the conveying medium or to the conveyor belt.
• FIG. 8 shows a further embodiment of the passive discharge means.
• the discharge means has the shape of a flap 17 suspended above the flywheel.
• the flap 17 is preferably made of plastic.
• pole wheel 5 is mounted centrically to the deflection roller and rotates in the conveying direction. Particles that jump vertically above the flywheel 5, bounce off the discharge 17, fall back on the fluid and thus get once again opportunity to jump and thus to a correct discharge into the concentrate.
• the passive discharge means according to the fifth and sixth embodiments can also be combined with the active discharge means according to the first to fourth embodiments. In this context, it should be mentioned that all embodiments can be combined with each other as desired and that the same parts are provided with the same reference numerals.
• FIG. 9 shows the results of a test series in which a mixture of glass and aluminum with a grain size of 2-4 mm was processed on an eddy current separator with a centrally arranged rotor.
• the passive discharge aid was a broom as shown in FIG. 7 outlined.
• the application mass aluminum in the concentrate / mass aluminum in the feed material was 77.4% with the rotor in synchronism ("clockwise", as shown in FIG.
• the pole wheels 4, 15 can be arranged centrically or eccentrically to the roller or deflecting drum 3, 4 of the conveying medium 2.
• Discharge agent (broom, cloth)
• Discharge agent (blowing device)

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• Electrostatic Separation (AREA)

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Cited By (2)

Citations (14)

• 2013
  • 2013-05-07 WO PCT/EP2013/059488 patent/WO2013167591A1/fr not_active Ceased

Patent Citations (14)

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