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US 4,070,274 AGranted
Coarse concentrated iron ore for catalytic purposes
AssigneeUnited States Steel Corporation
InventorRoy E. Bryson
Life of this patent
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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.
Claims11
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.
1 more element
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.
2 more elements
Dependencies are inferred from the claim text.