US4087004A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic beneficiation of clays utilizing magnetic particulates
Assignee: ECC America Inc
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Filing: 1975-10-01
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Granted: 1978-05-02
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Expires: 1995-10-01
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 seeded with a finely divided magnetic particulate. The seeded slurry is then subjected to a magnetic field, to magnetically flocculate the contaminants and the magnetic particulate, and thereupon remove same.
Inventors
- 👤 Alan J. Nott
- 👤 William M. Price
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:12
CPC Classifications
C; C04; C04B; C04B33/00; C04B33/02; C04B33/10
Claims Analysis
Total Claims: 26
Claim 1
Independent Claim
118 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 comprising an aqueous unpeptized suspension of a precipitate of ferrosoferric oxide, the particles of which are of predominantly colloidal size, said precipitate being the product of aqueous coprecipitation of iron (III) with iron (II) salts in the presence of an excess of a strong base; and subjecting the seeded slurry to a magnetic separation by passing said slurry through a porous ferromagnetic matrix positioned in a magnetic field to remove at least part of said particulate together with said titaniferous contaminants flocculated therewith.
Claim 2
Independent Claim
118 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 comprising an aqueous unpeptized suspension of a precipitate of ferrosoferric oxide, the particles of which are of predominantly colloidal size, said precipitate being the product of aqueous coprecipitation of iron (III) with iron (II) salts in the presence of an excess of a strong base; and subjecting the seeded slurry to a magnetic separation by passing said slurry through a porous ferromagnetic matrix positioned in a magnetic field to remove at least part of said particulate together with said titaniferous contaminants flocculated therewith.
Claim 3
Dependent Claim
36 words
A method in accordance with claim 1, further including leaching the purified product separated from said contaminants by said magnetic separation, to remove leachable iron, including at least part of the remnants of said seeding particulate.
Claim 4
Dependent Claim
45 words
A method in accordance with claim 1, wherein said aqueous precipitate is added to said slurry in concentrations of from about 10 to 150 ml per 4 lb. of dry clay, where each said ml includes about 0.05g equivalent of Fe 3 O 4 .
Claim 5
Dependent Claim
32 words
A method in accordance with claim 1, wherein said precipitate is added in concentrations including from about 1/2 to 7 lb. equivalent of Fe 3 O 4 per ton of dry clay.
Claim 6
Dependent Claim
23 words
A method in accordance with claim 1, wherein at least 50% of said particles by weight are of less than 1 micron E.S.D.
Claim 7
Dependent Claim
25 words
A method in accordance with claim 1, wherein said ferroso-ferric oxide has an iron (III) to iron (II) ratio of from about 1 to 2.5.
Claim 8
Dependent Claim
20 words
A method in accordance with claim 6, wherein said ratio is in the range of from about 1.5 to 2.0.
Claim 9
Dependent Claim
20 words
A method in accordance with claim 1, wherein said magnetic field has an average intensity as low as 5 kilogauss.
Claim 10
Dependent Claim
13 words
A method in accordance with claim 8, wherein said matrix comprises steel wool.
Claim 11
Dependent Claim
22 words
A method in accordance with claim 9, wherein said magnetic field has an average intensity of from about 15 to 22 kilogauss.
Claim 12
Dependent Claim
23 words
A method in accordance with claim 10, wherein the retention time of said slurry in said magnetic field is at least 15 seconds.
Claim 13
Dependent Claim
13 words
A method in accordance with claim 8, wherein said matrix comprises steel balls.
Claim 14
Dependent Claim
13 words
A method in accordance with claim 8, wherein said matrix comprises steel tacks.
Claim 15
Dependent Claim
22 words
A method in accordance with claim 8, wherein said magnetic field has an average intensity of from about 5 to 15 kilogauss.
Claim 16
Independent Claim
111 words
A method for magnetically separating discoloring titaniferous contaminants of low magnetic attractability from a crude kaolin clay, comprising the steps of: preparing an aqueous particulate of ferroso-ferric oxide by coprecipitating iron (III) with iron (II) salts, with an excess of a strong base to yield an unpeptized suspension of particles of predominantly colloidal size in an aqueous carrier; forming a dispersed aqueous slurry of said clay; seeding said slurry with said particulate; and subjecting said seeded slurry to a magnetic separation by passing said slurry through a porous ferromagnetic matrix positioned in a magnetic field to magnetically separate at least part of said particulate together with said titaniferous contaminants flocculated therewith.
Claim 17
Independent Claim
111 words
A method for magnetically separating discoloring titaniferous contaminants of low magnetic attractability from a crude kaolin clay, comprising the steps of: preparing an aqueous particulate of ferroso-ferric oxide by coprecipitating iron (III) with iron (II) salts, with an excess of a strong base to yield an unpeptized suspension of particles of predominantly colloidal size in an aqueous carrier; forming a dispersed aqueous slurry of said clay; seeding said slurry with said particulate; and subjecting said seeded slurry to a magnetic separation by passing said slurry through a porous ferromagnetic matrix positioned in a magnetic field to magnetically separate at least part of said particulate together with said titaniferous contaminants flocculated therewith.
Claim 18
Dependent Claim
25 words
A method in accordance with claim 15, wherein said ferrosoferric oxide has an iron (III) to iron (II) ratio of from about 1 to 2.5.
Claim 19
Dependent Claim
20 words
A method in accordance with claim 16, wherein said ratio is in the range of from about 1.5 to 2.0.
Claim 20
Dependent Claim
37 words
A method in accordance with claim 15, further including leaching the purified product separated from said contaminants by said step of magnetic separation, to remove iron, including at least part of the remnants of said seeding particulate.
Claim 21
Dependent Claim
40 words
A method in accordance with claim 15, wherein said particulate is prepared by heating an aqueous solution of said iron salts, and rapidly adding said base thereto, to promote production in said particulate of large numbers of minute seeding nuclei.
Claim 22
Dependent Claim
13 words
A method in accordance with claim 19, wherein said base comprises ammonium hydroxide.
Claim 23
Dependent Claim
44 words
A method in accordance with claim 19, wherein said aqueous particulate is added to said slurry in concentrations of from about 10 to 75 ml per 4 lb. dry clay, where each said ml includes about 0.5g equivalent of Fe 3 O 4 .
Claim 24
Dependent Claim
28 words
A method in accordance with claim 21, wherein said aqueous particulate is added in concentrations of from about 20 to 40 ml per 4 lb. of dry clay.
Claim 25
Dependent Claim
26 words
A method in accordance with claim 15, wherein said matrix comprises steel wool, and wherein said field is as low as 5 kilogauss in average intensity.
Claim 26
Dependent Claim
21 words
A method in accordance with claim 23, wherein said field has an average intensity of from about 5 to 15 kilogauss.
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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) | 1981-05-01 | 1981-10-31 | 1982-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-01 | 1985-10-31 | 1986-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-01 | 1989-10-31 | 1990-05-02 | $7700.00 | Window Closed / Lapsed |