Advanced research and technology. Direct utilization: recovery of minerals from coal fly ash. Technical progress report, July 1, 1981-September 30, 1981. [HiChlor and sintering processes]

Technical Report · Tue Dec 01 04:00:00 EST 1981

OSTI ID:5412563

Burnet, G; Dunker, J W; Murtha, M J

The primary objective of this investigation is to develop and/or improve methods for utilization of coal fly ash as a source of minerals. Processes are being studied for the recovery of aluminium oxide, iron oxides, and titanium oxide from fly ash and for utilization of the residues. Some of the highlights of the investigations on the HiChlor process development, and sinter processes for alumina recovery are as follows: computer calculations of the equilibrium conditions for the HiChlor process have shown that there may be economic and processing advantages to operation at conditions substoichiometric in chlorine; prechlorination, reaction of fly ash with Cl/sub 2/ and CO, has been shown to remove up to 40% of the Fe from a bituminous fly ash and up to 60% of the Fe from a subbituminous fly ash; physical characterization of alpha-alumina and leached fly ash pellets has shown both to have a low surface area and an ill-defined pore structure; the CO-Cl/sub 2/ chlorination conversion rate for alpha-alumina has been determined to be mass-transfer controlled in pellets under HiChlor process conditions; both anhydrous and aqueous product separation schemes for the HiChlor process have been examined, as well as alternate chlorination methods for coal fly ash; economic analysis of the HiChlor process has been updated to reflect current costs; experiments on the high-temperature sintering of limestone-fly ash mixtures have included alumina extraction and x-ray diffraction measurements of prepared sinter mixtures; addition of coal refuse to limestone-fly ash sinters has resulted in substantial increases in the amount of soluble alumina which can be extracted; sintering of mixtures of limestone and fly ash with several oxide additives has revealed that the concentration of phosphorus oxide in the sinters determines whether the sinters auto-disintegrate.

• Research Organization: Ames Lab., IA (USA)
• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 5412563
• Report Number(s): IS-4785; ON: DE82007855
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
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
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
ASHES
CARBON COMPOUNDS
CARBON MONOXIDE
CARBON OXIDES
CARBONATE ROCKS
CARBONATES
CHALCOGENIDES
CHEMICAL REACTIONS
CHLORINATION
COHERENT SCATTERING
DATA
DIFFRACTION
ECONOMIC ANALYSIS
ECONOMICS
EXPERIMENTAL DATA
FABRICATION
FLY ASH
FOSSIL-FUEL POWER PLANTS
HALOGENATION
INFORMATION
IRON COMPOUNDS
IRON OXIDES
LIMESTONE
MANAGEMENT
MATERIALS RECOVERY
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHOSPHORUS COMPOUNDS
PHOSPHORUS OXIDES
POWER PLANTS
PROCESSING
RECOVERY
RESEARCH PROGRAMS
RESIDUES
ROCKS
SCATTERING
SEDIMENTARY ROCKS
SINTERING
SODIUM CARBONATES
SODIUM COMPOUNDS
THERMAL POWER PLANTS
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS
WASTE MANAGEMENT
WASTE PROCESSING
WASTE PRODUCT UTILIZATION
WASTES
X-RAY DIFFRACTION