High-temperature chlorination of coal fly ash. [MS Thesis; 52 references; 750 to 900/sup 0/C]

Technical Report · Tue Jan 01 04:00:00 EST 1980

DOI:https://doi.org/10.2172/5235458· OSTI ID:5235458

Adelman, D J

Fly ash is being considered here as a source of aluminum and possibly titanium. The HiChlor process has been proposed and the steps necessary to extract and purify the metals from fly ash are outlined. A reduction-chlorination reaction is suggested as the step to remove the metals from fly ash. The fly ash is exposed at elevated temperatures to a reductant and chlorine, and volatile metal chlorides are produced. The purpose of the work reported here was to study this gas-solid reaction. Test conditions were specified, experiments conducted, and the results analyzed in an effort to decide what limited the reaction rates and the final fly ash conversions. With such information, operating conditions can be specified and equipment designed to improve the yields and efficiency of the reaction. The thermodynamics of the reactions of iron oxides, aluminium oxides, silicon oxides, and titanium oxides with the reductant and chlorine are considered. Leaching of the fly ash before reaction is desirable to remove calcium oxides (calcium compounds react preferentially with the chlorine). The reaction was followed for a two hour period; at this point the reaction nearly stopped with 80% recovery of alumina. Carbon monoxide is the primary reductant at 750/sup 0/C and carbon at 900/sup 0/C. (LTN)

• Research Organization: Ames Lab., IA (USA)
• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 5235458
• Report Number(s): IS-T-924
• 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
ALUMINIUM
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CARBON
CHALCOGENIDES
CHEMICAL REACTIONS
CHLORIDES
CHLORINATION
CHLORINE COMPOUNDS
DISSOLUTION
ELEMENTS
ENERGY
ENTHALPY
FLY ASH
FREE ENERGY
GRAPHITE
HALIDES
HALOGEN COMPOUNDS
HALOGENATION
IRON COMPOUNDS
IRON OXIDES
LEACHING
METALS
NONMETALS
OXIDES
OXYGEN COMPOUNDS
PHYSICAL PROPERTIES
RECOVERY
REDUCING AGENTS
REDUCTION
SEPARATION PROCESSES
TEMPERATURE DEPENDENCE
THERMODYNAMIC PROPERTIES
TITANIUM
TRANSITION ELEMENT COMPOUNDS
TRANSITION ELEMENTS
VOLATILITY
WASTE PRODUCT UTILIZATION
WASTES