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US 4,432,868 AGranted
Separation of high grade magnetite from fly ash
AssigneeHalomet, Incorporated
InventorRobert G. Aldrich
Life of this patent
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Abstract
A unique, high-grade magnetite obtained from fly ash, the use thereof in the cleaning of coal, and low iron content fly ash.
Claims2
Magnetite derived from fly ash obtained as a product of coal combustion which comprises an admixture of spherical particles and broken spherical particles, the broken spherical particles being obtained by grinding spherical particles having a size greater than 325 mesh;
- said magnetite having a percent magnetics of at least about 96% as measured by Davis Tube and a specific gravity of from about 4.1 to about 4.5 and consisting essentially of particles less than 325 mesh.
Dependencies are inferred from the claim text.