US3974067A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for improving clay brightness utilizing magnetic separation
Assignee: ECC America Inc
•
Filing: 1974-10-08
•
Granted: 1976-08-10
•
Expires: 1994-10-08
Abstract
Abstract A method for brightening a kaolin clay wherein an aqueous dispersion is initially formed of said clay, which dispersion is blunged and conditioned and the resultant slurry thereupon subjected to a froth flotation treatment to remove titaniferous impurities. The purified product from the froth flotation treatment is thereupon subjected to magnetic separation by passing such product through a slurry-pervious ferromagnetic matrix positioned in a high intensity magnetic field, which results in substantial, additional brightening of the clay.
Inventors
- 👤 Alan J. Nott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:54
CPC Classifications
C; C04; C04B; C04B33/00; C04B33/02; C04B33/10; B; B03; B03D; B03D1/00; B03D1/001; B03D1/004; B03D1/014; B03D2201/00; B03D2201/02
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
144 words
A method for brightening a kaolin clay, comprising: forming an aqueous dispersion of said clay, and blunging and conditioning said dispersion as to dissipate at least 10 h.p.-hrs. of energy per ton of solids, at least said conditioning step being conducted in the presence of oleic acid as a collecting agent; subjecting the resultant blunged and conditioned slurry to a froth flotation treatment to remove titaniferous impurities; and subjecting the product from said froth flotation treatment to a wet magnetic separation to further increase the brightness of said clay be removal of discoloring contaminants in addition to said titaniferous impurities, by passing said product through a slurry-pervious ferromagnetic matrix positioned in a high intensity magnetic field, the retention time in said field being at least 15 seconds, and the said field being maintained at an average field intensity of from 7 to 22 kilogauss.
Claim 2
Independent Claim
144 words
A method for brightening a kaolin clay, comprising: forming an aqueous dispersion of said clay, and blunging and conditioning said dispersion as to dissipate at least 10 h.p.-hrs. of energy per ton of solids, at least said conditioning step being conducted in the presence of oleic acid as a collecting agent; subjecting the resultant blunged and conditioned slurry to a froth flotation treatment to remove titaniferous impurities; and subjecting the product from said froth flotation treatment to a wet magnetic separation to further increase the brightness of said clay be removal of discoloring contaminants in addition to said titaniferous impurities, by passing said product through a slurry-pervious ferromagnetic matrix positioned in a high intensity magnetic field, the retention time in said field being at least 15 seconds, and the said field being maintained at an average field intensity of from 7 to 22 kilogauss.
Claim 3
Dependent Claim
36 words
A method in accordance with claim 1, further including the steps of flocculating the slurry from said magnetic separation; leaching said flocculated slurry; and washing the product clay free of residual leaching agents and reaction products.
Claim 4
Dependent Claim
19 words
A method in accordance with claim 1, wherein said field is maintained at from about 15 to 20 kilogauss.
Claim 5
Dependent Claim
28 words
A method in accordance with claim 3, wherein said magnetic separation step is effected by passing said aqueous slurry through a filamentary matrix maintained in said magnetic field.
Claim 6
Dependent Claim
14 words
A method in accordance with claim 4, wherein said matrix comprises a steel wool.
Claim 7
Dependent Claim
26 words
A method in accordance with claim 1, wherein said blunging and conditioning steps are conducted while said slurry includes from about 35 to 60% solids content.
Claim 8
Dependent Claim
17 words
A method in accordance with claim 6, wherein said blunging and conditioning steps are carried on simultaneously.
Claim 9
Dependent Claim
40 words
A method in accordance with claim 7, wherein said blunging and conditioning step is conducted by agitating said dispersion under alkaline conditions in the presence of said oleic acid, as a collector agent, and of sodium silicate as a dispersant.
Claim 10
Dependent Claim
39 words
A method in accordance with claim 8, wherein said oleic acid is present in concentrations of from about 2 to 4 lbs/ton, and said sodium silicate is present in quantities of from about 1/2 to 16 lbs/ton of clay.
Claim 11
Dependent Claim
37 words
A method in accordance with claim 9, wherein from about 1/2 to 3 lbs/ton of a water soluble salt of a polyacrylic acid or polymethacrylic acid are present in said slurry during said blunging and conditioning step.
Claim 12
Dependent Claim
26 words
A method in accordance with claim 1, wherein at least 25 h.p.-hrs. of energy per ton of solids are dissipated during said blunging and conditioning steps.
Claim 13
Dependent Claim
24 words
A method in accordance with claim 11, wherein said oleic acid is present in concentrations of from about 2 to 4 lbs/ton of solids.
References Cited (Backward Citations)
US3273707A
Cited
US2249569A
Cited
US3032189A
Cited
US3302785A
Cited
US3450257A
Cited
US3471011A
Cited
US3462013A
Cited
US3676337A
Cited
US3826365A
Cited
US3853983A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-08-10 | 1980-02-09 | 1980-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-10 | 1984-02-09 | 1984-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-10 | 1988-02-09 | 1988-08-10 | $7700.00 | Window Closed / Lapsed |