New developments in the lime-soda sinter process for recovery of alumina from fly ash
A further investigation of the lime-soda sinter process has resulted in unique correlations between sinter composition and yield of alumina for fly ashes from both bituminous and subbituminous coals. Either an excess or deficiency of limestone or soda ash compared to the quantities called for by the correlations will reduce the recovery of alumina below the better than 90 percent level otherwise attainable. No apparent difference in reactivity was found between the calcium contained in the fly ashes and that in the added limestone. Lower sintering temperatures can be used for fly ashes from subbituminous coals. Process economics are determined largely by the alumina and calcium contents of the ash, the sintering temperature required, and sales credit for by-products.
- Research Organization:
- Ames Lab., IA (USA); Iowa State Univ. of Science and Technology, Ames (USA). Dept. of Chemical Engineering
- DOE Contract Number:
- W-7405-ENG-82
- OSTI ID:
- 6446806
- Report Number(s):
- IS-M-177; CONF-790205-2
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
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
ALKALI METAL COMPOUNDS
ALUMINATES
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
BITUMINOUS COAL
BLACK COAL
BY-PRODUCTS
CARBON COMPOUNDS
CARBONACEOUS MATERIALS
CARBONATE ROCKS
CARBONATES
CHALCOGENIDES
CHEMICAL COMPOSITION
CHEMICAL REACTIONS
COAL
CONCENTRATORS
CORRELATIONS
ECONOMICS
ENERGY SOURCES
FABRICATION
FEASIBILITY STUDIES
FLY ASH
FOSSIL FUELS
FUELS
IRON COMPOUNDS
LIMESTONE
MAGNETIC SEPARATORS
MANAGEMENT
MATERIALS RECOVERY
MINERALS
OPTIMIZATION
OXIDES
OXYGEN COMPOUNDS
PROCESSING
RECOVERY
REMOVAL
RESERVOIR ROCK
ROCKS
SEDIMENTARY ROCKS
SILICA
SILICON COMPOUNDS
SILICON OXIDES
SINTERING
SODIUM CARBONATES
SODIUM COMPOUNDS
SOLUBILITY
SUBBITUMINOUS COAL
TRANSITION ELEMENT COMPOUNDS
WASTE MANAGEMENT
WASTE PROCESSING
WASTE PRODUCT UTILIZATION
WASTES
YIELDS