US4225426A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic beneficiation of clays utilizing magnetic particulates
Assignee: ECC America Inc
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Filing: 1978-02-02
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Granted: 1980-09-30
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Expires: 1998-02-02
Abstract
Abstract A method for magnetically separating titaniferous discolorants from a crude kaolin clay. A dispersed aqueous slurry of the clay is formed and ferrimagnetic particles are thereupon spontaneously coflocculated with the titaniferous discolorants by seeding the slurry with a system of said particles. The system includes predominantly sub-micron size particles, and the particles further, have an isoelectric point in relation to that of the titaniferous discolorants to enable the spontaneous coflocculation. The slurry is thereupon passed through a porous ferromagnetic matrix in the presence of a magnetic field, to separate the coflocculated particles and discolorants at the matrix.
Inventors
- 👤 William M. Price
- 👤 Alan J. Nott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:56
CPC Classifications
B; B03; B03D; B03D3/00; B03D3/06; B01; B01D; B01D21/00; B01D21/0009; B01D21/01; B03C; B03C1/00; B03C1/002; B03C1/005; B03C1/01
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
98 words
A method for magnetically separating titaniferous discolorants from a crude kaolin clay, comprising the steps of: forming a dispersed aqueous slurry of said clay; spontaneously coflocculating ferrimagnetic particles with said titaniferous impurities by seeding said slurry with a system of said particles, wherein said particles are predominantly sub-micron in size and comprise a magnetic ferrite of the general formula MO.Fe 2 O 3 , where M is a divalent metal ion; and passing the resultant slurry through a porous ferromagnetic matrix in the presence of a magnetic field, to separate said coflocculated particles and impurities at said matrix.
Claim 2
Independent Claim
98 words
A method for magnetically separating titaniferous discolorants from a crude kaolin clay, comprising the steps of: forming a dispersed aqueous slurry of said clay; spontaneously coflocculating ferrimagnetic particles with said titaniferous impurities by seeding said slurry with a system of said particles, wherein said particles are predominantly sub-micron in size and comprise a magnetic ferrite of the general formula MO.Fe 2 O 3 , where M is a divalent metal ion; and passing the resultant slurry through a porous ferromagnetic matrix in the presence of a magnetic field, to separate said coflocculated particles and impurities at said matrix.
Claim 3
Dependent Claim
20 words
A method in accordance with claim 1, wherein the particles of said system are suspended in an aqueous carrier phase.
Claim 4
Dependent Claim
17 words
A system in accordance with claim 2, wherein said particles are transiently suspended in said aqueous phase.
Claim 5
Dependent Claim
19 words
A method in accordance with claim 1, wherein said system is added to said slurry as a dry powder.
Claim 6
Dependent Claim
15 words
A method in accordance with claim 4, wherein said system is substantially free of oils.
Claim 7
Dependent Claim
13 words
A method in accordance with claim 1, wherein said ferrite comprises ferroso-ferric oxide.
Claim 8
Dependent Claim
16 words
A method in accordance with claim 1, wherein said ferrite comprises NiFe 2 O 4 .
Claim 9
Dependent Claim
16 words
A method in accordance with claim 1, wherein said ferrite comprises CoFe 2 O 4 .
Claim 10
Dependent Claim
16 words
A method in accordance with claim 1, wherein said ferrite comprises BaFe 2 O 4 .
Claim 11
Dependent Claim
39 words
A method in accordance with claim 1, wherein said system comprises the product of aqueous coprecipitation of an iron (III) salt with the salt of the said divalent metal in the presence of an excess of a strong base.
Claim 12
Dependent Claim
23 words
A method in accordance with claim 10, wherein said system comprises the product of aqueous coprecipitation of iron (III) with nickel (II) salts.
Claim 13
Dependent Claim
23 words
A method in accordance with claim 10, wherein said system comprises the product of aqueous coprecipitation of iron (III) with cobalt (II) salts.
Claim 14
Dependent Claim
24 words
A method in accordance with claim 1, wherein said magnetic field has an intensity in the range of from about 0.5 to 22 kilogauss.
Claim 15
Dependent Claim
24 words
A method in accordance with claim 1, wherein said magnetic field has an intensity in the range of from about 0.5 to 5 kilogauss.
Claim 16
Dependent Claim
14 words
A method in accordance with claim 1, wherein said matrix comprises a steel wool.
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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) | 1983-09-30 | 1984-03-31 | 1984-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-30 | 1988-03-31 | 1988-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-30 | 1992-03-31 | 1992-09-30 | $7700.00 | Window Closed / Lapsed |