New processes for the recovery of resource materials from coal combustion wastes
Laboratory-scale tests of methods for the recovery of aluminum and other metal values from fly ash have included reported processes such as lime-sinter, lime-soda-sinter, and the obvious direct acid leach methods, as well as two new combination sinter--dilute acid leach methods. In the first, fly ash is sintered with a NaCl--Na/sub 2/CO/sub 3/ mixture at 1000/sup 0/C followed by successive leaches with water and 1 N HNO/sub 3/ or H/sub 2/SO/sub 4/. In the second, fly ash is sintered with a CaSO/sub 4/--CaCo/sub 3/ mixture at 1400/sup 0/C, after which the sinter-cake is pugged with 36 N H/sub 2/SO/sub 4/ and then diluted to 4 N for a second leaching period. Both of these new methods are capable of recovering greater than 95 percent of the aluminum, of yielding a pure Al/sub 2/O/sub 3/ product if a solvent extraction circuit is included, and providing for product option flexibility in that Fe, Ti, Mn, U, and Th can also be recovered.
- Research Organization:
- Oak Ridge National Lab., TN (USA)
- DOE Contract Number:
- W-7405-ENG-26
- OSTI ID:
- 6558256
- Report Number(s):
- CONF-780801-39
- Resource Relation:
- Conference: 13. intersociety energy conversion engineering conference, San Diego, CA, USA, 20 Aug 1978
- Country of Publication:
- United States
- Language:
- English
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Chemical development of the Calsinter process for recovering resource materials from fly ash
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Related Subjects
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
ALUMINIUM
RECOVERY
FLY ASH
CHEMICAL COMPOSITION
WASTE PRODUCT UTILIZATION
ASHES
CALCIUM CARBONATES
CALCIUM SULFATES
COAL
COMBUSTION
FEASIBILITY STUDIES
IRON
LEACHING
MANGANESE
SODIUM CARBONATES
SODIUM CHLORIDES
THORIUM
TITANIUM
URANIUM
ACTINIDES
AEROSOL WASTES
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBONACEOUS MATERIALS
CARBONATES
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
DISSOLUTION
ELEMENTS
ENERGY SOURCES
FOSSIL FUELS
FUELS
HALIDES
HALOGEN COMPOUNDS
METALS
OXIDATION
OXYGEN COMPOUNDS
RESIDUES
SEPARATION PROCESSES
SODIUM COMPOUNDS
SULFATES
SULFUR COMPOUNDS
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENTS
WASTES
010800* - Coal
Lignite
& Peat- Waste Management
320305 - Energy Conservation
Consumption
& Utilization- Industrial & Agricultural Processes- Industrial Waste Management