US4125460A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic beneficiation of clays utilizing magnetic particulates
Assignee: ECC America Inc
•
Filing: 1976-12-22
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Granted: 1978-11-14
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Expires: 1996-12-22
Abstract
Abstract A method for magnetically separating discoloring contaminants of low magnetic attractability from a crude kaolin clay containing said contaminants. A dispersed aqueous slurry of the clay is admixed with a finely divided magnetic particulate. The slurry is thereupon passed through a porous, ferromagnetic matrix in the presence of an applied magnetic field, whereby contaminants seeded by the particulate are separated from the slurry.
Inventors
- 👤 Alan J. Nott
- 👤 William M. Price
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 14:58
CPC Classifications
C; C04; C04B; C04B33/00; C04B33/02; C04B33/10
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
162 words
A method for magnetically separating discoloring titaniferous contaminants of low magnetic attractability from a crude kaolin clay, comprising the steps of: forming a dispersed aqueous slurry of said clay; seeding said slurry with a particulate selected from one or more members of the group consisting of (1) a finely divided ferrimagnetic powder wherein at least 50% by weight of the particles thereof are of less than 30 microns E.S.D.; (2) an aqueous unpeptized precipitate of a magnetic ferrite, the particles of which are of predominantly colloidal size; and (3) an aqueous peptized precipitate of a magnetic ferrite, the particles of which are of predominantly colloidal size and are dispersed in a substantially entirely and uniformly aqueous phase; and subjecting the seeded slurry to a magnetic separation by passing said slurry through a porous ferromagnetic matrix positioned in a magnetic field having an intensity in the range of from about 0.5 to 5 kG, to remove said titaniferous contaminants seeded by said particulate.
Claim 2
Independent Claim
162 words
A method for magnetically separating discoloring titaniferous contaminants of low magnetic attractability from a crude kaolin clay, comprising the steps of: forming a dispersed aqueous slurry of said clay; seeding said slurry with a particulate selected from one or more members of the group consisting of (1) a finely divided ferrimagnetic powder wherein at least 50% by weight of the particles thereof are of less than 30 microns E.S.D.; (2) an aqueous unpeptized precipitate of a magnetic ferrite, the particles of which are of predominantly colloidal size; and (3) an aqueous peptized precipitate of a magnetic ferrite, the particles of which are of predominantly colloidal size and are dispersed in a substantially entirely and uniformly aqueous phase; and subjecting the seeded slurry to a magnetic separation by passing said slurry through a porous ferromagnetic matrix positioned in a magnetic field having an intensity in the range of from about 0.5 to 5 kG, to remove said titaniferous contaminants seeded by said particulate.
Claim 3
Dependent Claim
13 words
A method in accordance with claim 1, wherein said particulate comprises ferroso-ferric oxide.
Claim 4
Dependent Claim
32 words
A method in accordance with claim 2, further including leaching the purified product from said magnetic separation, to remove leachable iron, including at least part of the remnants of said seeding particulate.
Claim 5
Dependent Claim
13 words
A method in accordance with claim 1, wherein said matrix comprises steel wool.
Claim 6
Dependent Claim
13 words
A method in accordance with claim 1, wherein said matrix comprises steel balls.
Claim 7
Dependent Claim
13 words
A method in accordance with claim 1, wherein said matrix comprises steel tacks.
Claim 8
Dependent Claim
17 words
A method in accordance with claim 1, wherein said particulate comprises a said powder of natural magnetite.
Claim 9
Dependent Claim
23 words
A method in accordance with claim 1, wherein the retention time of said slurry in said magnetic field is at least 15 seconds.
Claim 10
Dependent Claim
14 words
A method in accordance with claim 1, wherein said particulate comprises a magnetic ferrite.
Claim 11
Dependent Claim
19 words
A method in accordance with claim 1, wherein said particulate comprises a precipitate of NiFe 2 O 4 .
Claim 12
Dependent Claim
19 words
A method in accordance with claim 1, wherein said particulate comprises a precipitate of CoFe 2 O 4 .
References Cited (Backward Citations)
US933717A
Cited
US1043851A
Cited
US2352324A
Cited
US2834470A
Cited
US2954122A
Cited
US3215572A
Cited
US3480555A
Cited
US3372803A
Cited
US3482685A
Cited
US3471011A
Cited
US3670337A
Cited
US3627678A
Cited
US3806449A
Cited
SU452800A1
Cited
US3843540A
Cited
US3853983A
Cited
US3926789A
Cited
US3887479A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-11-13 | 1982-05-15 | 1982-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-11-13 | 1986-05-15 | 1986-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-11-13 | 1990-05-15 | 1990-11-14 | $7700.00 | Window Closed / Lapsed |