Direct utilization - recovery of minerals from coal fly ash. Technical progress report, October 1, 1982-December 31, 1982
Research included an examination of the adsorbed water on coal fly ash, the utilization of phosgene as a chlorination agent, the physical adsorption and chemisorption of phosgene on fly ash particles, and the aqueous separation of chlorination products. Results of an investigation of coal fly ash powder samples using photoacoustic infrared spectroscopy showed almost complete removal of adsorbed water after drying for 30 hours at 700/sup 0/C. A thermodynamic computer simulation of the chlorination of an SiO/sub 2/ and Al/sub 2/O/sub 3/ mixture of 2:1 molar ratio with a stoichiometric amount of carbon present revealed that silica is the preferred reactant at lower temperature, but that alumina chlorination is preferred at 800/sup 0/C. Experiments using phosgene to chlorinate acid-leached Texas lignite fly ash gave information about the kinetic rate dependence of the reaction involved. Work to determine the amount of chemisorption and physical adsorption of phosgene on pellets of the leached Texas lignite ash was initiated to permit the calculation of surface reaction rates. Separation of FeCl/sub 3/ by solvent extraction improved as the chloride ion concentration of the aqueous phase increased, regardless of whether the associated cation was hydrogen or aluminum. A static equilibrium cell/furnace arrangement with ultraviolet spectroscopy capability has been confirmed to be suitable for measurement of the absorbance of vapor species. A Harper 6 in. dia rotary kiln was used to continuously sinter a limestone-soda ash-fly ash mixture in the form of 1/8 in. dia pellets. Extraction of sintered material with dilute aqueous soda ash solution gave aluminate recoveries comparable to those obtained when small samples were sintered in a benchscale tube furnace. Results are presented which show that x-ray diffraction data can be used to calculate the amounts of individual compounds in sintered samples.
- Research Organization:
- Ames Lab., IA (USA)
- DOE Contract Number:
- W-7405-ENG-82
- OSTI ID:
- 5767423
- Report Number(s):
- IS-4829; ON: DE83016748
- Resource Relation:
- Other Information: Portions are illegible in microfiche products. Original copy available until stock is exhausted
- Country of Publication:
- United States
- Language:
- English
Similar Records
Advanced research and technology: direct utilization, recovery of minerals from coal fly ash. Fossil-Energy Program technical progress report, October 1, 1981-December 31, 1981
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]
Related Subjects
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
ALUMINIUM CHLORIDES
RECOVERY
ALUMINIUM OXIDES
CHLORINATION
FLY ASH
SORPTIVE PROPERTIES
IRON CHLORIDES
PHOSGENE
CHEMISORPTION
SILICON OXIDES
WATER
ADSORPTION
CHEMICAL REACTION KINETICS
HICHLOR PROCESS
SEPARATION PROCESSES
SINTERING
AEROSOL WASTES
ALUMINIUM COMPOUNDS
ASHES
CARBONIC ACID DERIVATIVES
CHALCOGENIDES
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
FABRICATION
HALIDES
HALOGEN COMPOUNDS
HALOGENATION
HYDROGEN COMPOUNDS
IRON COMPOUNDS
KINETICS
MANAGEMENT
ORGANIC CHLORINE COMPOUNDS
ORGANIC COMPOUNDS
ORGANIC HALOGEN COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
PROCESSING
REACTION KINETICS
RESIDUES
SILICON COMPOUNDS
SORPTION
SURFACE PROPERTIES
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