Salt-soda sinter process for recovering aluminum from fly ash

Patent · Tue Mar 03 00:00:00 EST 1981

OSTI ID:6287882

Mcdowell, W J; Seeley, F G

A method for recovering aluminum values from fly ash comprises sintering the fly ash with a mixture of NaCl and Na2CO3 to a temperature in the range 700*-900* C for a period of time sufficient to convert greater than 90% of the aluminum content of the fly ash into an acid-soluble fraction and then contacting the thus-treated fraction with an aqueous solution of nitric or sulfuric acid to effect dissolution of aluminum and other metal values in said solution.

• Assignee: Department of Energy
• Patent Number(s): US 4254088
• OSTI ID: 6287882
• Resource Relation: Patent File Date: Filed date 27 Mar 1979
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
ALUMINIUM
MATERIALS RECOVERY
FLY ASH
RECYCLING
NITRIC ACID
ORGANIC SOLVENTS
SODIUM CARBONATES
SODIUM CHLORIDES
SOLVENT EXTRACTION
SULFURIC ACID
WASTE PROCESSING
AEROSOL WASTES
ALKALI METAL COMPOUNDS
ASHES
CARBON COMPOUNDS
CARBONATES
CHLORIDES
CHLORINE COMPOUNDS
ELEMENTS
EXTRACTION
HALIDES
HALOGEN COMPOUNDS
HYDROGEN COMPOUNDS
INORGANIC ACIDS
MANAGEMENT
METALS
OXYGEN COMPOUNDS
PROCESSING
RECOVERY
RESIDUES
SEPARATION PROCESSES
SODIUM COMPOUNDS
SOLVENTS
WASTE MANAGEMENT
WASTES
010800* - Coal
Lignite
& Peat- Waste Management
320305 - Energy Conservation
Consumption
& Utilization- Industrial & Agricultural Processes- Industrial Waste Management