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US 4,319,988 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.
Claims9
A high purity magnetite derived from fly ash which is the product of coal combustion obtained by:
- (a) subjecting fly ash to dry magnetic separation;
- (b) forming a slurry comprising the magnetic fraction obtained from said dry separation;
- (c) subjecting such slurry to a first wet magnetic separation;
- (d) screening the magnetic fraction from said first wet magnetic separation;
- (e) subjecting the oversized particles to grinding;
- (f) screening the products from said grinding step;
- (g) subjecting the passed material from the screening steps (d) and (f) to a final wet magnetic separation;
- and
- (h) separating a high purity magnetite from said final wet separation.
6 more elements
A process for recovering magnetite from fly ash obtained as a product from coal combustion, said process including the steps of:
- (a) subjecting fly ash to dry magnetic separation;
- (b) forming a slurry comprising the magnetic fraction obtained from said dry separation;
- (c) subjecting such slurry to a first wet magnetic separation;
- (d) screening the magnetic fraction from said first wet magnetic separation;
- (e) subjecting the oversized particles to grinding;
- (f) screening the products from said grinding step;
- (g) subjecting the passed material from the screening steps (d) and (f) to a final wet magnetic separation;
- and
- (h) separating a high purity magnetite from said final wet separation.
6 more elements
Dependencies are inferred from the claim text.