US2487272A - High-frequency electric separator - Google Patents

High-frequency electric separator Download PDF

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US2487272A
US2487272A US671978A US67197846A US2487272A US 2487272 A US2487272 A US 2487272A US 671978 A US671978 A US 671978A US 67197846 A US67197846 A US 67197846A US 2487272 A US2487272 A US 2487272A
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particles
stream
loop
discharged
frequency electric
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US671978A
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William G Price
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William G Price
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B03SEPARATION 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
    • B03CMAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03C1/00Magnetic separation
    • B03C1/02Magnetic separation acting directly on the substance being separated
    • B03C1/23Magnetic 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

Description

NOV. 8, 1949 w, PRlCE 2,487,272
HIGH-FREQUENCY ELECTRI C SEPARATOR Filed May 24, 1946 w/ INVENTOR L160? G. PRICE:
BYQ a n ms ATTORNEY Patented Nov. 8, 1949 HIGH-FREQUENCY ELECTRIC SEPARATOR William G. Price, Port Blakely, Wash.
Application May .24, 1946, Serial No.'671,978
3 Claims. (Cl. 209-212) My invention relates to the separation of particles of non-magnetizable electrically conductive materials such as gold, silver and copper from non-metallic particles such as ground rock and sand.
The invention has for its object the provision of a means and a method of separating materials of the character referred to, by the use of a high frequency electrical current field through which the mixture of materials is passed in the form of a stream and in such manner that movement of the electrically-conductive particles is so retarded by the field that they fall from the moving stream under the force of gravity.
In the accompanying drawing, Figure 1 is a side view, partly in section, showing apparatus suitable for use in the practice of my invention; Fig. 2 is a schematic plan view of a portion of the apparatus of Fig. 1, and Fig. 3 is a perspective view, on an enlarged scale, of a portion of the electrical coil of Figs. 1 and 2.
The apparatus comprises a base 4 to which is secured a frame 5 in which shafts 6 and l are journaled, the shaft 6 being driven at high speed from any suitable source of power to thereby rotate the shaft I and a table 8 that is secured to the shaft 1. A plate 9 is supported from the base 4 by uprights I and has bins l I, I2 and [3 formed therein in position to receive particles of material projected from the table 8.
Finely divided dry materials such as ground rock containing metal particles or sand with metal particles are supplied to the table 8 by any suitable means such as a conveyor belt l that discharges upon a screen 5 to separate the coarsest particles from the fine particles that will fall into a hopper l7 whose lower end is positioned in proximity to a comically-shaped boss It at the center of the table.
The material is fed at such rate and the table rotated at such speed that the particles of the mixture will be discharged by centrifugal force from the edge of the table in a thin stream or sheet of a thickness not substantially greater than the diameter of single particles. To this end, the table, if its surface is at an angle of approximately 14 to a horizontal plane, will suitably be rotated at about 400 revolutions per minute. The material will be fed from the hopper at a rate depending upon the diameter of the table so as to maintain the desired thinness of the stream or sheet discharged from the edge of the table.
An alternating magnetic field is produced by a high frequency generator 20 at perhaps 30,000
volts and a frequency of 18 mgc. The high-frequency field is produced in a zone extending peripherally of the table by a coil 2| that may suitably be in the form of copper tubingjone portion of which is bent to form a lower loop 22 that extends the complete distance around the table, except for the small space shown in Fig. 3, and an upper loop 23 that also extends completely around the table, except at said space, the tube being bent at 24 where the loops 22 and 23 meet. The free end of each loop is extended laterally at 25 and 26 respectively, for connection with the generator 20. An electrical field as indicated at 21 is thus produced entirely around the peripheral edge of the table.
The vertical spacing of the loops 2223 of the coil and their positions are such that the particles will be discharged from the table through the space between loops and hence through the middle of the field 21. Because an alternating field resists the passage therethrough of electrically-conductive but non-magnetic material, the movement of the metallic particles when discharged from the table will be retarded, causing them to drop into the bin ll, under the force of gravity. The less conductive particles will fall into the bin [2, while the non-conductive particles will fall into the bin l3. Because the mixture is discharged in the form of a stream of single-particle thickness, danger of the metallic particles being pushed over into the bin [3 by the non-metallic particles is reduced to a minimum.
I claim as my invention:
1. An electrical separator comprising a table that is rotatable in a horizontal plane, to centrifugally discharge finely divided material that is supplied to a, central zone thereon, an electric coil disposed adjacent to the edge of the table, but spaced peripherally thereof, and means for supplying an alternating electrical current of high frequency to the coil, of sufiicient intensity to provide a field that will be effective to retard movement of any electrically-conductive but nonmagnetic particles when they are discharged from the table, the coil having a loop positioned to lie beneath the stream of material discharged from the table and a loop'positioned above the other loop and above the stream.
2. An electrical separator comprising a table that is rotatable in a horizontal plane, to centrifugally discharge finely divided material that is supplied to a central zone thereon, an electric coil disposed adjacent to the edge of the table, but spaced peripherally thereof, and means for supplying an alternating electrical current of high frequency to the coil, of suflicient intensity to provide a field that will be effective to retard movement of any electrically-conductive but nonmagnetic particles when they are discharged from the table, the material-receiving surface of the table being sloped upwardly from its center to its peripheral edge, the coil having a loop positioned to lie beneath the stream of discharged material and a loop above the other loop and above the stream.
3. An electrical separator comprising means for projecting a mixture containing electrically-conductive but non-magnetic particles and non-conductive particles, in a generally horizontal direction and in the form of an unsupported thin stream, an electric coil having a loop positioned in a plane below the plane of the stream, and a REFERENCES CITED The following references are of record in the file of this patent:
UNITED STATES PATENTS Number Name Date 653,342 Gates July 10, 1900 1,417,189 McCarthy May 23, 1922 1,422,026 Brown July 4, 1922 1,829,565 Lee Oct. 27, 1931
US671978A 1946-05-24 1946-05-24 High-frequency electric separator Expired - Lifetime US2487272A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2708518A (en) * 1950-06-29 1955-05-17 Gen Electric Method of separation of magnetic particles of high retentivity from those of low retentivity
US3877578A (en) * 1972-09-18 1975-04-15 Occidental Petroleum Corp Separation process for flint, amber, and green glass particles from a mixture of the three colors
US4069145A (en) * 1976-05-24 1978-01-17 Magnetic Separation Systems, Inc. Electromagnetic eddy current materials separator apparatus and method
US4106627A (en) * 1975-01-30 1978-08-15 Agency Of Industrial Science & Technology Method and apparatus for use in separation and recovery of non-magnetic metal pieces
US5275292A (en) * 1992-05-18 1994-01-04 Brugger Richard D Eddy current separator

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US653342A (en) * 1899-09-26 1900-07-10 Theodore J Mayer Diamagnetic separation.
US1417189A (en) * 1920-01-12 1922-05-23 Mccarthy Joseph Bartholemew Concentrator
US1422026A (en) * 1920-01-07 1922-07-04 Electrostatic Separation Compa Process and apparatus for electrostatic separation of finely-divided discrete material
US1829565A (en) * 1925-04-20 1931-10-27 Lee Engineering Res Corp Ore concentration

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US653342A (en) * 1899-09-26 1900-07-10 Theodore J Mayer Diamagnetic separation.
US1422026A (en) * 1920-01-07 1922-07-04 Electrostatic Separation Compa Process and apparatus for electrostatic separation of finely-divided discrete material
US1417189A (en) * 1920-01-12 1922-05-23 Mccarthy Joseph Bartholemew Concentrator
US1829565A (en) * 1925-04-20 1931-10-27 Lee Engineering Res Corp Ore concentration

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2708518A (en) * 1950-06-29 1955-05-17 Gen Electric Method of separation of magnetic particles of high retentivity from those of low retentivity
US3877578A (en) * 1972-09-18 1975-04-15 Occidental Petroleum Corp Separation process for flint, amber, and green glass particles from a mixture of the three colors
US4106627A (en) * 1975-01-30 1978-08-15 Agency Of Industrial Science & Technology Method and apparatus for use in separation and recovery of non-magnetic metal pieces
US4069145A (en) * 1976-05-24 1978-01-17 Magnetic Separation Systems, Inc. Electromagnetic eddy current materials separator apparatus and method
US5275292A (en) * 1992-05-18 1994-01-04 Brugger Richard D Eddy current separator

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