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Office of Scientific and Technical Information
 

Recovery of aluminum and other metal values from fly ash

Patent ·
OSTI ID:6494465
;

The invention described herein relates to a method for improving the acid leachability of aluminum and other metal values found in fly ash which comprises sintering the fly ash, prior to acid leaching, with a calcium sulfate-containing composition at a temperature at which the calcium sulfate is retained in said composition during sintering and for a time sufficient to quantitatively convert the aluminum in said fly ash into an acid leachable form.

Assignee:
Department of Energy
Patent Number(s):
US 4252777
OSTI ID:
6494465
Country of Publication:
United States
Language:
English

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Related Subjects

01 COAL, LIGNITE, AND PEAT
010800* -- Coal
Lignite
& Peat-- Waste Management
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
320305 -- Energy Conservation
Consumption
& Utilization-- Industrial & Agricultural Processes-- Industrial Waste Management
AEROSOL WASTES
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM
ASHES
CALCIUM COMPOUNDS
CALCIUM SULFATES
DISSOLUTION
ELEMENTS
FABRICATION
FLY ASH
LEACHING
MANAGEMENT
MATERIALS RECOVERY
METALS
OXYGEN COMPOUNDS
PROCESSING
RECOVERY
RECYCLING
RESIDUES
SEPARATION PROCESSES
SINTERING
SULFATES
SULFUR COMPOUNDS
WASTE MANAGEMENT
WASTE PROCESSING
WASTES