US3599879A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Grinding treatment of clay
Assignee: Imerys Minerals Ltd
•
Filing: 1970-02-17
•
Granted: 1971-08-17
•
Expires: 1990-02-17
Abstract
Abstract A forth flotation process for the removal of mineral impurities from a crude clay wherein the flotation reagents are removed from the purified clay particles by agitation of a slurry of the clay with a particulate grinding material consisting of particles of a size in the range from one-half inch to 100 mesh B. S. sieve. The weight ratio of particulate grinding material to clay is in the range 2:1 to 5:1, and the agitation is continued for a time sufficient to dissipate in the slurry at least 100 horsepower hours of energy per long ton of clay.
Inventors
- 👤 Norman Owen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:24
CPC Classifications
B; B28; B28C; B28C1/00; B28C1/003
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
31 words
A process according to claim 1, wherein the particulate grinding material consists of particles ranging in size from a No. 10 mesh B.S. sieve to a No. 30 mesh B.S. sieve.
Claim 2
Dependent Claim
33 words
A process according to claim 2, wherein said mixture resulting from step (d) is agitated for a time sufficient to dissipate therein at least 150 horsepower hours of energy per ton of clay.
Claim 3
Dependent Claim
167 words
In a process for increasing the brightness of a clay feedstock wherein the clay feedstock is conditioned and then subjected in the form of a reagentized aqueous slurry to a froth flotation process so as to form a suspension of purified clay in a reagentized aqueous liquor, the improvement which comprises the steps of a. adjusting the concentration of the suspension of purified clay in a reagentized aqueous liquor to a solids content of at least 20 percent by weight, b. mixing the aqueous suspension of purified clay with a particulate grinding material in a volume ratio of particulate grinding material to clay/water suspension in the range 0.5 to 1.5:1, the particulate grinding material consisting of particles of a size in the range from 1/2 inches to 100 mesh B.S. sieve, c. agitating the mixture resulting from step (b) for a time sufficient to dissipate therein at least 100 horsepower hours of energy per ton of clay, and d. separating the particulate grinding material and the clay.
Claim 4
Dependent Claim
79 words
A process according to claim 4, wherein the suspension of purified clay in a reagentized aqueous liquor is concentrated to a solids content of at least 65 percent by weight to remove a major proportion of the reagentized aqueous liquor and is thereafter formed into an aqueous slurry having a solids content in the range from 20 to 65 percent by weight and containing a nonmucilaginous dispersing agent, prior to mixing in the particulate grinding material in step (b).
Claim 5
Dependent Claim
73 words
A process according to claim 4, wherein tHe suspension of purified clay in a reagentized aqueous liquor is concentrated to a solids content of at least 65 percent by weight to remove a major proportion of the reagentized aqueous liquor and is thereafter formed into an aqueous slurry having a solids content in the range from 20 to 40 percent by weight, prior to mixing with the particulate grinding material in step (b).
References Cited (Backward Citations)
US2920832A
Cited
US3464634A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-16 | 1975-02-15 | 1975-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-16 | 1979-02-15 | 1979-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-16 | 1983-02-15 | 1983-08-17 | $7700.00 | Window Closed / Lapsed |