Back to results
US 4,567,026 AGranted
Method for extraction of iron aluminum and titanium from coal ash
AssigneeInterNorth, Inc.
InventorBohdan Lisowyj
Life of this patent
Estimating the term…
Abstract
A method is disclosed for the recovery of iron, aluminum and titanium from coal ash. The method comprises magnetically extracting magnetite from the ash, leaching the ash with a solution of a mineral acid, precipitating and removing titanium and iron hydroxides from the leach solution by adding thereto a solution of a strong base, and precipitating and removing aluminum hydroxide by contacting the remaining solution with carbon dioxide or aluminum hydroxide seeding.
Claims2
A method for the recovery of iron, aluminum, and titanium from coal ash which comprises:
- (a) magnetically extracting magnetite from the ash,
- (b) leaching the ash with a solution of a mineral acid selected from the group consisting of sulfuric, hydrochloric, and nitric acids,
- (c) precipitating and removing titanium and iron hydroxides from the leach solution by adding thereto a solution of a strong base selected from the group consisting of sodium, potassium, and ammonium hydroxides,
- (d) precipitating aluminum hydroxide by contacting the remaining solution from step (c) with a precipitation agent selected from the group consisting of carbon dioxide, a weak mineral acid, and aluminum hydroxide seed, and
- (e) removing the aluminum hydroxide.
2 more elements
Dependencies are inferred from the claim text.