Direct acid dissolution of aluminum and other metals from fly ash
Fly ash could provide a significant domestic source of alumina and thus supply a large part of the US needs for aluminum and possibly also several other metals. The aluminum and other metals can be solubilized from fly ash by acid dissolution methods. The aluminum may be present in any or all of three solid phases: (1) crystalline; (2) glassy amorphous; and (3) irregular, spongy amorphous. The chemistry of these phases controls the solubilization behavior. The aluminum in high-calcium western ashes is primarily found in the amorphous phases, and much of it can be solubilized by using short-time, ambient-temperature leaching. Little of the aluminum in the low-calcium eastern ashes is solubilized under ambient-temperature conditions, and only a portion can be solubilized even at reflux temperature conditions. Some of the aluminum in these eastern ashes is present as mullite, while some is found in the amorphous material. The fraction contained in mullite is relativey acid insoluble, and only partial solubilization can be achieved even under vigorous acid leach conditions.
- Research Organization:
- Oak Ridge National Lab., TN (USA)
- DOE Contract Number:
- W-7405-ENG-26
- OSTI ID:
- 6670624
- Report Number(s):
- CONF-810203-6
- Resource Relation:
- Conference: AIME annual meeting, Chicago, IL, USA, 22 Feb 1981
- Country of Publication:
- United States
- Language:
- English
Similar Records
Dissolution and recovery of aluminum and other metals from Calsinter process sinter product
Weathering processes in relation to leachate properties of alkaline fly ash
Related Subjects
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
ALUMINIUM
SOLVENT EXTRACTION
FLY ASH
CHEMICAL ANALYSIS
CRYSTAL STRUCTURE
LEACHING
AMORPHOUS STATE
CHEMICAL REACTION KINETICS
CRYSTALS
DISSOLUTION
EXPERIMENTAL DATA
GEOGRAPHICAL VARIATIONS
MATERIALS RECOVERY
MULLITE
PH VALUE
TEMPERATURE DEPENDENCE
WASTE PRODUCT UTILIZATION
X-RAY DIFFRACTION
AEROSOL WASTES
COHERENT SCATTERING
DATA
DIFFRACTION
ELEMENTS
EXTRACTION
INFORMATION
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
KINETICS
MANAGEMENT
MATERIALS
METALS
MINERALS
NUMERICAL DATA
PROCESSING
REACTION KINETICS
RECOVERY
SCATTERING
SEPARATION PROCESSES
VARIATIONS
WASTE MANAGEMENT
WASTE PROCESSING
WASTES
010800* - Coal
Lignite
& Peat- Waste Management
010600 - Coal
Lignite
& Peat- Properties & Composition
320305 - Energy Conservation
Consumption
& Utilization- Industrial & Agricultural Processes- Industrial Waste Management