Patent US3750963A successfully refreshed from Google Patents.
US3750963A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Benefication of a clay containing sylvinite ore
Assignee: IMC Fertilizer Inc
•
Filing: 1970-10-02
•
Granted: 1973-08-07
•
Expires: 1990-10-02
Abstract
Abstract Coarse, unliberated, clay-containing sylvinite is subjected to gravity beneficiation to remove significant amounts of halite and clay. The sylvite-containing overflow, having a reduced clay content, may be comminuted and subjected to wet beneficiation.
Inventors
- 👤 W Dancy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:01
CPC Classifications
B; B03; B03B; B03B7/00; C; C01; C01D; C01D3/00; C01D3/04; C01D3/08
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
19 words
comminuting said overflow fraction to at least -inch to liberate said sylvite; and 3 wet beneficiating said comminuted particles
Claim 2
Dependent Claim
41 words
A process according to claim 1 wherein said sylvinite ore particles range from about three-quarters inch to about 10 mesh, the overflow from the gravity separation is comminuted to about -10 mesh, and said comminuted particles are subjected to froth flotation.
Claim 3
Dependent Claim
27 words
sizing said ore particles at about 10 mesh to about one-quarter inch to provide an oversize fraction containing sylvite in substantially unliberated form and an undersize fraction;
Claim 4
Dependent Claim
55 words
subjecting the oversize from (2) to gravity separation in a liquid 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 having a K2O:clay ratio of at least about 10:1 and halite and clay particles are removed as an underflow fraction;
Claim 5
Dependent Claim
41 words
A process according to claim 1 wherein said sylvinite ore particles range from about one-half inch to about 10 mesh, the overflow from the gravity separation is comminuted to about -10 mesh, and said comminuted particles are subjected to froth flotation.
Claim 6
Dependent Claim
44 words
A process according to claim 1 wherein said sylvinite ore particles range in size from about three-quarters inch to about one-quarter inch, the overflow from the gravity separation is comminuted to about - 1/4 inch, and said comminuted particles are subjected to crystallization beneficiation.
Claim 7
Dependent Claim
21 words
comminuting said overflow fraction from the gravity separation of (3) to at least - 1/4 inch to liberate the sylvite; and
Claim 8
Dependent Claim
14 words
A process according to claim 1 wherein said gravity separation in a vortex separation.
Claim 9
Dependent Claim
26 words
combining and wet beneficiating said undersize from (2) and said comminuted particles from (4), the composite K2O:clay content of these fractions being at least about 8:1.
Claim 10
Dependent Claim
28 words
A process for beneficiating clay-containing sylvinite ore having a clay content of at least about 3 percent and a K2O:clay ratio of not more than about 5:1 comprising:
Claim 11
Dependent Claim
41 words
A process according to claim 6 wherein said sylvinite ore particles are comminuted to about three-quarters inch and are sized at about 10 mesh, said overflow fraction is comminuted to about -10 mesh and said fractions are subjected to froth flotation.
Claim 12
Dependent Claim
41 words
A process according to claim 6 wherein said sylvinite ore particles are comminuted to about one-half inch and are sized at about 10 mesh, said overflow fraction is comminuted to about -10 mesh and said fractions are subjected to froth flotation.
Claim 13
Dependent Claim
41 words
A process according to claim 6 wherein said sylvinite ore particles are comminuted to about three-quarters inch and are sized at about one-quarter inch, said overflow fraction is comminuted to about - 1/4 inch and said fractions are subjected to crystallization.
Claim 14
Dependent Claim
18 words
A process according to claim 6 wherein said ore is heated to remove free water prior to comminution.
Claim 15
Dependent Claim
14 words
A process according to claim 6 wherein said gravity separation is a vortex separation.
Claim 16
Dependent Claim
21 words
A process according to claim 6 wherein the composite K2O: clay ratio of the fine particles is at least aboUt 10:1.
References Cited (Backward Citations)
CA792819A
Cited
US2325149A
Cited
US2526519A
Cited
US2846068A
Cited
US2931502A
Cited
US2950007A
Cited
US3008655A
Cited
US3145163A
Cited
US3337328A
Cited
US3537657A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-06 | 1977-02-05 | 1977-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-06 | 1981-02-05 | 1981-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-06 | 1985-02-05 | 1985-08-07 | $7700.00 | Window Closed / Lapsed |