Patent US1855003A successfully refreshed from Google Patents.
Patent US4478711A successfully refreshed from Google Patents.
US4478711A
Expired / Lapsed
US
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Method and apparatus for separating dry magnetic material
Assignee: Cryogenic Consultants Ltd
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Filing: 1982-07-09
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Granted: 1984-10-23
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Expires: 2002-07-09
Abstract
Abstract The invention relates to separators for separating relatively magnetic particles from relatively non-magnetic particles in the dry state. The method of the invention involves allowing a mixture of the particles to flow past a magnet, preferably a high strength magnet, which is so arranged as to produce a strong magnetic field in a radial direction, the radial component greatly exceeding the axial component and the axial component exerting a force which is preferably substantially less than that of gravity. In this way, the magnetic particles are diverted towards the magnet but not retained by it while the non-magnetic particles continue in their original path.
Inventors
- 👤 Enrico Cohen
- 👤 Jeremy A. Good
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 11:07
CPC Classifications
B; B03; B03C; B03C1/00; B03C1/02; B03C1/035; Y; Y10; Y10S; Y10S505/00; Y10S505/825; Y10S505/931; Y10S505/932
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
239 words
A method of separating relatively magnetic particles from relatively non-magnetic particles in a dry state comprising the steps of: providing an adjustable, substantially vertical, flow of a mixture of the magnetic and non-magnetic particles, the particles moving under at least the influence of gravity, in a three-dimensional stream in a common path adjacent to, and at a predetermined distance away from, a magnet, producing a uniform strong magnetic field force with said magnet having a radial component produced over a relatively short proportion of said path of the particles, said radial component greatly exceeding an axial component of the magnetic field force, and said axial component exerting a force which is less than that of gravity, said path being a predetermined distance away from the magnet in a direction of said radial component of the magnetic field force, so that magnetic particles in said mixture of particles are diverted from said path toward said magnet but are not retained by it while particles in said mixture of particles not diverted toward said magnet continue in said path, and separating particles in said mixture of particles not diverted from said path toward said magnet from magnetic particles in said mixture of particles diverted from said path toward said magnet with a splitter located adjacent to said path of the particles below said relatively short proportion of said path over which said radial component of the magnetic field force is produced.
Claim 2
Independent Claim
239 words
A method of separating relatively magnetic particles from relatively non-magnetic particles in a dry state comprising the steps of: providing an adjustable, substantially vertical, flow of a mixture of the magnetic and non-magnetic particles, the particles moving under at least the influence of gravity, in a three-dimensional stream in a common path adjacent to, and at a predetermined distance away from, a magnet, producing a uniform strong magnetic field force with said magnet having a radial component produced over a relatively short proportion of said path of the particles, said radial component greatly exceeding an axial component of the magnetic field force, and said axial component exerting a force which is less than that of gravity, said path being a predetermined distance away from the magnet in a direction of said radial component of the magnetic field force, so that magnetic particles in said mixture of particles are diverted from said path toward said magnet but are not retained by it while particles in said mixture of particles not diverted toward said magnet continue in said path, and separating particles in said mixture of particles not diverted from said path toward said magnet from magnetic particles in said mixture of particles diverted from said path toward said magnet with a splitter located adjacent to said path of the particles below said relatively short proportion of said path over which said radial component of the magnetic field force is produced.
Claim 3
Dependent Claim
22 words
A method as claimed in claim 1 wherein said mixture is provided in a spiral path around and down adjacent said magnet.
Claim 4
Dependent Claim
28 words
A method as claimed in claim 1 in which all of said particles are caused to move in said path with the assistance of suction or gaseous pressure.
Claim 5
Dependent Claim
23 words
A method as claimed in claim 1 in which the pressure of the air, through which all of the particles fall, is reduced.
Claim 6
Dependent Claim
35 words
A method as claimed in claim 1 in which said magnet comprises a plurality of horizontally disposed magnetic coils wound in opposite directions and positioned one vertically above the other with a small gap therebetween.
Claim 7
Dependent Claim
24 words
A method as claimed in claim 1 in which said magnet is a high strength magnet having a field strength of about 20,000 gauss.
Claim 8
Dependent Claim
293 words
A magnetic separator for separating relatively magnetic particles from relatively non-magnetic particles in a dry state comprising; a magnet so constructed as to produce a uniform radial magnetic field large compared with its axial field, means for supplying a mixture of magnetic and non-magnetic particulate material in a three-dimensional path adjacent to and at a predetermined distance from said magnet, the supply means and the magnet being arranged such that the material moves along its path under the influence of gravity, and the magnetic particles in said mixture are diverted from said path toward said magnet whereas the particles in said mixture which are not diverted toward said magnet continue substantially in said path, the position of said means for supplying said mixture of magnetic and non-magnetic particles being such that the magnetic particles are allowed to travel a distance sufficient to enable the particles to have a desired velocity, prior to entering the magnetic field, compatible with magnetic particles in said mixture being diverted by the radial field of said magnet by a distance sufficient to substantially separate particles in said mixture which are not diverted toward said magnet from magnetic particles in said mixture which are diverted toward said magnet into separate streams without said diverted magnetic particles being retained by said magnet, and the position and arrangement of said magnet being such that the particles in said mixture are subjected to magnetic force over only a relatively short portion of said path, and a splitter positioned and arranged with respect to said magnet so as to separate particles in said mixture which are not diverted toward said magnet from magnetic particles in said mixture which are diverted toward said magnet after the particles in said mixture have been magnetically separated.
Claim 9
Dependent Claim
293 words
A magnetic separator for separating relatively magnetic particles from relatively non-magnetic particles in a dry state comprising; a magnet so constructed as to produce a uniform radial magnetic field large compared with its axial field, means for supplying a mixture of magnetic and non-magnetic particulate material in a three-dimensional path adjacent to and at a predetermined distance from said magnet, the supply means and the magnet being arranged such that the material moves along its path under the influence of gravity, and the magnetic particles in said mixture are diverted from said path toward said magnet whereas the particles in said mixture which are not diverted toward said magnet continue substantially in said path, the position of said means for supplying said mixture of magnetic and non-magnetic particles being such that the magnetic particles are allowed to travel a distance sufficient to enable the particles to have a desired velocity, prior to entering the magnetic field, compatible with magnetic particles in said mixture being diverted by the radial field of said magnet by a distance sufficient to substantially separate particles in said mixture which are not diverted toward said magnet from magnetic particles in said mixture which are diverted toward said magnet into separate streams without said diverted magnetic particles being retained by said magnet, and the position and arrangement of said magnet being such that the particles in said mixture are subjected to magnetic force over only a relatively short portion of said path, and a splitter positioned and arranged with respect to said magnet so as to separate particles in said mixture which are not diverted toward said magnet from magnetic particles in said mixture which are diverted toward said magnet after the particles in said mixture have been magnetically separated.
Claim 10
Dependent Claim
73 words
A magnetic separator as claimed in claim 7 in which said means for supplying the particles comprises a hopper having an outlet orifice and inner and outer guide skirts to control the shape and direction of the flow of the mixture of magnetic and non-magnetic particulate material, said inner guide skirt extending to a distance of about three times the diameter of the outlet orifice of said hopper, and terminating adjacent the magnet.
Claim 11
Dependent Claim
36 words
A magnetic separator as claimed in claim 7 in which said means for supplying the particles includes a hopper having a wall and an annular outlet provided with an adjustable choke to control the flow rate.
Claim 12
Dependent Claim
24 words
A magnetic separator as claimed in claim 9 in which said choke and wall of said hopper define a conical path adjacent the outlet.
Claim 13
Dependent Claim
52 words
A magnetic separator as claimed in claim 7 wherein said mixture moves in a spiral path around and down adjacent said magnet, the means for supplying a mixture of magnetic and non-magnetic particulate material including a tangential inlet and a wall to constrain the movement of the particles in the desired path.
Claim 14
Dependent Claim
34 words
A magnetic separator as claimed in claim 7 wherein said magnet comprises at least two co-axial coils one positioned horizontally above the other, the at least two co-axial coils being wound in opposite directions.
Claim 15
Dependent Claim
17 words
A magnetic separator as claimed in claim 7 in which said magnet is a high strength magnet.
Claim 16
Dependent Claim
16 words
A magnetic separator as claimed in claim 13 in which said magnet is a superconducting magnet.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-10-23 | 1988-04-23 | 1988-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-10-23 | 1992-04-23 | 1992-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-10-23 | 1996-04-23 | 1996-10-23 | $7700.00 | Window Closed / Lapsed |