Patent US4070274A successfully refreshed from Google Patents.
US4070274A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coarse concentrated iron ore for catalytic purposes
Assignee: United States Steel Corp
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Filing: 1976-03-11
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Granted: 1978-01-24
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Expires: 1996-03-11
Abstract
Abstract An iron ore concentrate is made having at least 60% -6 to +14 mesh and no more than about 1% -20 mesh, by a process preferably employing a small counterflow sizer on a product obtained from the concentrate of a spiral concentrator through which is processed a high-iron mill product or partially concentrated coarse feed. The product of the counterflow sizer is agitated to separate cohering particles and then further concentrated.
Inventors
- 👤 Roy E. Bryson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 13:58
CPC Classifications
B; B03; B03B; B03B7/00
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
142 words
Process for making a coarse, low-fines iron ore concentrate comprising a. concentrating, by gravity and density in a spiral concentrator, a ground and screened iron ore to obtain tailings and a first coarse concentrate having about 10 to about 25% by weight particles of -6 to +14 mesh and about 75 to about 90% -20 mesh, b. hydraulically sizing said first coarse concentrate to obtain a second coarse concentrate having about 15 to about 40% particles of -6 to +14 mesh and about 60 to about 85% -20 mesh, c. agitating at least a portion of said second coarse concentrate to separate cohering particles, to obtain a third coarse concentrate, and d. size-separating said third coarse concentrate to obtain a product containing at least 60% particles in the range of about -6 to +14 mesh and up to about 1% -20 mesh.
Claim 2
Dependent Claim
142 words
Process for making a coarse, low-fines iron ore concentrate comprising a. concentrating, by gravity and density in a spiral concentrator, a ground and screened iron ore to obtain tailings and a first coarse concentrate having about 10 to about 25% by weight particles of -6 to +14 mesh and about 75 to about 90% -20 mesh, b. hydraulically sizing said first coarse concentrate to obtain a second coarse concentrate having about 15 to about 40% particles of -6 to +14 mesh and about 60 to about 85% -20 mesh, c. agitating at least a portion of said second coarse concentrate to separate cohering particles, to obtain a third coarse concentrate, and d. size-separating said third coarse concentrate to obtain a product containing at least 60% particles in the range of about -6 to +14 mesh and up to about 1% -20 mesh.
Claim 3
Dependent Claim
21 words
Process of claim 1 in which the ground iron ore is about 20 to about 35% ground iron ore in water.
Claim 4
Dependent Claim
25 words
Process of claim 1 in which tailings from step (a) are treated to remove fines therefrom and the water remaining from said tailings is recycled.
Claim 5
Dependent Claim
31 words
Process of claim 3 in which the tailings are treated with a coagulant to assist in the settling of the fines, and the fines are removed from the water after settling.
Claim 6
Dependent Claim
25 words
Process of claim 1 in which the second coarse concentrate is screened and only the screen oversize is agitated to form the third coarse concentrate.
Claim 7
Dependent Claim
13 words
Process of claim 5 in which water is added to the screen oversize.
Claim 8
Dependent Claim
27 words
Process of claim 5 in which the second coarse concentrate is screened with a screen vibrating at a frequency of at least about 1800 vibrations per minute.
Claim 9
Dependent Claim
66 words
Apparatus for making a coarse, low-fines iron ore concentrate comprising a. a spiral concentrator, b. a hydraulic counterflow sizer for size-separating the coarse concentrate therefrom, c. means for screening the coarse concentrate from said sizer, d. agitating means for subjecting the overflow from said screening means to turbulence to separate cohering particles in said overflow, and e. means for size-separating the product of said agitating means.
Claim 10
Dependent Claim
66 words
Apparatus for making a coarse, low-fines iron ore concentrate comprising a. a spiral concentrator, b. a hydraulic counterflow sizer for size-separating the coarse concentrate therefrom, c. means for screening the coarse concentrate from said sizer, d. agitating means for subjecting the overflow from said screening means to turbulence to separate cohering particles in said overflow, and e. means for size-separating the product of said agitating means.
Claim 11
Dependent Claim
18 words
Apparatus of claim 8 including means for removing fines from the overflow of said counterflow sizer by settling.
Claim 12
Dependent Claim
15 words
Apparatus of claim 8 in which the means for screening is a high-frequency vibrating screen.
Claim 13
Dependent Claim
19 words
Apparatus of claim 10 in which the screen is capable of vibrating at more than 1800 vibrations per minute.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-01-23 | 1981-07-25 | 1982-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-23 | 1985-07-25 | 1986-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-23 | 1989-07-25 | 1990-01-24 | $7700.00 | Window Closed / Lapsed |