Patent US3677475A successfully refreshed from Google Patents.
US3677475A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Beneficiation of clay-containing sylvinite ore
Assignee: IMC Fertilizer Inc
•
Filing: 1970-10-02
•
Granted: 1972-07-18
•
Expires: 1990-10-02
Abstract
Abstract Coarse clay-containing sylvinite is subjected to gravity separation and the overflow is divided into two portions by sizing at about one-quarter inch. The finer fraction is subjected to a gravity separation to provide a sylvite product while the coarser fraction is crushed to minus about one-quarter inch and then subjected to gravity separation to provide a sylvite concentrate which is subjected to another gravity separation to provide a sylvite product.
Inventors
- 👤 William B Dancy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:03
CPC Classifications
B; B03; B03B; B03B9/00
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
22 words
A process according to claim 1 wherein said ore is sized to provide particles having a maximum size of about three-fourth inch.
Claim 2
Dependent Claim
54 words
subjecting said fraction of (1) to gravity separation in a media having a specific gravity of separation intermediate the specific gravity of sylvite and halite whereby sylvite-containing particles are removed as an overflow fraction characterized by a K2O:clay ratio of at least about 10:1 and halite and clay particles are removed as an underflow;
Claim 3
Dependent Claim
31 words
sizing said overflow fraction of (2) to provide a first fraction having particle sizes of less than about one-fourth inch and second fraction having particle sizes greater than about one-fourth inch;
Claim 4
Dependent Claim
22 words
A process according to claim 1 wherein said ore is sized to provide particles having a maximum size of about one-half inch.
Claim 5
Dependent Claim
17 words
A process according to claim 1 wherein said gravity separations employ heavy media as the liquid media.
Claim 6
Dependent Claim
33 words
subjecting said first fraction of (3) to gravity separation in a media having a specific gravity of separation intermediate the specific gravity of sylvite and halite whereby an overflow sylvite concentrate is obtained;
Claim 7
Dependent Claim
24 words
comminuting said second fraction of (3) and sizing said fraction to provide particles having sizes ranging from about 1/4 inch to about 10 mesh;
Claim 8
Dependent Claim
22 words
A process according to claim 1 wherein said gravity separations employ a heavy media of brine and magnetite and are vortex separations.
Claim 9
Dependent Claim
18 words
A process according to claim 1 wherein said ore is heated to remove free water prior to comminuting.
Claim 10
Dependent Claim
32 words
subjecting said comminuted particles of (5) to gravity separation in a media having a specific gravity of separation intermediate the specific gravity of sylvite and halite to provide a sylvite-containing overflow; and
Claim 11
Dependent Claim
33 words
subjecting said sylvite-containing overflow of (6) to gravity separation in a media having a specific gravity of separation intermediate the specific gravity of sylvite and halite whereby an overflow sylvite concentrate is obtained.
Claim 12
Dependent Claim
16 words
A process according to claim 1 wherein the undersize from comminution is subjected to wet beneficiation.
Claim 13
Dependent Claim
13 words
A process according to claim 7 wherein said wet beneficiation is froth flotation.
Claim 14
Dependent Claim
12 words
A process according to claim 7 wherein said wet beneficiation is crystallization.
Claim 15
Dependent Claim
20 words
A process according to claim 7 wherein the composite K2O: clay ratio of said undersize is at least about 8:1.
Claim 16
Dependent Claim
20 words
A process according to claim 7 wherein the composite K2O: clay ratio of said undersize is at least about 10:1.
Claim 17
Dependent Claim
28 words
A process according to claim 1 wherein the comminuted particles of step (5) are subjected to further gravity separation by recycling to the gravity separation of step (2).
Claim 18
Dependent Claim
25 words
A process according to claim 1 wherein the underflow from the gravity separation of (7) is comminuted and recycled to the gravity separation of (2).
Claim 19
Dependent Claim
25 words
A process according to claim 1 wherein the undersize from comminution and the underflow from the gravity separation of (7) are subjected to wet beneficiation.
References Cited (Backward Citations)
CA792819A
Cited
US2675966A
Cited
US2569141A
Cited
US3037624A
Cited
US3008655A
Cited
US3331504A
Cited
US3337328A
Cited
US3417927A
Cited
US3384310A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |