Patent US4243387A successfully refreshed from Google Patents.
Patent US3932276A successfully refreshed from Google Patents.
US3932276A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filtration aids in uranium ore processing
Assignee: Stein Hall and Co Inc
•
Filing: 1974-05-09
•
Granted: 1976-01-13
•
Expires: 1994-05-09
Abstract
Abstract Improved flocculation efficiency and filtration of carbonate leached uranium ore pulps are obtained by incorporating hydroxyalkyl guars in the filter feed slurry.
Inventors
- 👤 Harold L. Ford
- 👤 Nathan M. Levine
- 👤 Alan Robert Risdon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:37
CPC Classifications
B; B01; B01D; B01D21/00; B01D21/01; C; C22; C22B; C22B60/00; C22B60/02; C22B60/0204; C22B60/0217; C22B60/0252
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
114 words
A process of improving the filtration efficiency and separation of uranium containing pregnant solutions from the solid tailings of uranium ore pulps obtained by carbonate leaching of uranium ore which comprises mixing said ore pulps with an aqueous solution containing 0.1 to 1 weight percent based on the total weight of the solution of hydroxyalkyl guar having a molar substitution (M.S.) of about 0.1 to 3.0 and selected from the group consisting of hydroxyethyl and hydroxypropyl guar in the amount of 0.1 to 2.0 pounds of hydroxyalkyl guar per ton of uranium ore and filtering said ore pulps and guar, said mixing and filtering taking place at a temperature of about 150° to 180°F.
Claim 2
Dependent Claim
114 words
A process of improving the filtration efficiency and separation of uranium containing pregnant solutions from the solid tailings of uranium ore pulps obtained by carbonate leaching of uranium ore which comprises mixing said ore pulps with an aqueous solution containing 0.1 to 1 weight percent based on the total weight of the solution of hydroxyalkyl guar having a molar substitution (M.S.) of about 0.1 to 3.0 and selected from the group consisting of hydroxyethyl and hydroxypropyl guar in the amount of 0.1 to 2.0 pounds of hydroxyalkyl guar per ton of uranium ore and filtering said ore pulps and guar, said mixing and filtering taking place at a temperature of about 150° to 180°F.
Claim 3
Dependent Claim
19 words
The process of claim 1 wherein the hydroxyalkyl guar is hydroxypropyl guar having an M.S. of 0.1 to 3.0.
Claim 4
Dependent Claim
12 words
The process of claim 2 wherein the M.S. is 0.2 to 1.2.
Claim 5
Dependent Claim
17 words
The process of claim 1 wherein the aqueous solution contains 0.3 to 0.6 weight percent hydroxypropyl guar.
Claim 6
Dependent Claim
20 words
The process of claim 1 wherein the amount of hydroxyalkyl guar is 0.3 to 1.0 pound per ton of ore.
Claim 7
Dependent Claim
12 words
The process of claim 5 wherein the hydroxyalkyl guar is hydroxypropyl guar.
References Cited (Backward Citations)
US3183058A
Cited
US3326890A
Cited
US3532218A
Cited
US3723408A
Cited
US3700612A
Cited
US3830736A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-01-12 | 1979-07-14 | 1980-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-12 | 1983-07-14 | 1984-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-12 | 1987-07-14 | 1988-01-13 | $7700.00 | Window Closed / Lapsed |