Advanced research and technology: direct utilization-recovery of minerals from coal fly ash. Technical progress report, 1 October 1978-30 September 1979
Research focused on technical development of promising methods for recovering minerals from power plant fly ash. Development of the high-temperature (HiChlor) gas chlorination process and refinement and definition of the recovery steps of extraction and desilication for the lime-soda sinter process were emphasized. A preliminary design and cost estimate for commercialization of the HiChlor process and a proposal for a process development unit for scale-up of the lime-soda sinter process were prepared. Both physical and chemical beneficiation techniques to upgrade the iron content of the magnetic fly ash were tested; chemical beneficiation using high-temperature NaOH leaching was found to be the most effective method. Pretreatment for each of the processes includes magnetic separation of coal fly ash. Bituminous coal fly ashes contain magnetic iron oxide particles which can be removed by magnetic separation. The magnetic material consists primarily of iron oxides, with small amounts of silica and alumina. Removal of additional silica and alumina will give a product which can be used for steel production. Physical investigations included careful study of internal structure of fly ash particles. Fly ash samples were separated for a range of electromagnetic power settings and the fractions were analyzed for size determinations, chemical compositions, and morphological contents. Chemical analyses showed that, for the nonmagnetic fly ash fractions, the silica and iron contents are independent of size, and that the alumina content is highest in the smaller particles.
- Research Organization:
- Ames Lab., Ames, IA (United States)
- DOE Contract Number:
- W-7405-ENG-82
- OSTI ID:
- 5602680
- Report Number(s):
- IS-4720
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
ALUMINIUM OXIDES
MATERIALS RECOVERY
FLY ASH
WASTE PRODUCT UTILIZATION
IRON OXIDES
TITANIUM OXIDES
CHEMICAL REACTORS
CHLORINATION
FEASIBILITY STUDIES
FOSSIL-FUEL POWER PLANTS
MAGNETIC SEPARATORS
MINERALS
AEROSOL WASTES
ALUMINIUM COMPOUNDS
CHALCOGENIDES
CHEMICAL REACTIONS
CONCENTRATORS
HALOGENATION
IRON COMPOUNDS
MANAGEMENT
OXIDES
OXYGEN COMPOUNDS
POWER PLANTS
PROCESSING
RECOVERY
THERMAL POWER PLANTS
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
WASTE MANAGEMENT
WASTE PROCESSING
WASTES
010800* - Coal
Lignite
& Peat- Waste Management
320305 - Energy Conservation
Consumption
& Utilization- Industrial & Agricultural Processes- Industrial Waste Management