Advanced research and technology direct utilization: recovery of minerals from coal fly ash. Fossil energy program technical progress report, 1 April 1981-30 June 1981
The purpose of this research is to develop methods to process fly ash for (1) the separation and use of an iron-rich fraction; (2) the recovery of metals (primarily Al, Fe, and Ti); and (3) the use of the process residues. During this report period, research on the HiChlor process for the high-temperature chlorination of fly ash included investigation of prechlorinations using Cl/sub 2/-CO gas mixtures to selectively remove iron and titanium, and the physical characterization of fly ash pellets. Gas diffusion coefficients, surface areas, and pore size distributions were measured for both gamma-alumina and fly ash pellets. Experiments on the high temperature sintering of limestone-fly ash mixtures include alumina extractions from sinters prepared using waste materials. High alumina recoveries were obtained for sinters prepared using cement kiln dust as the lime source, and with small amounts of coal refuse added as a mineralizer. Sinter feed mixtures prepared from fly ash, kiln dust, and soda ash were also tested. X-ray diffraction measurements were used to identify the soluble and insoluble compounds found in the clinkers produced. Research has been initiated on methods to agglomerate fly ash mixtures for processing. Agglomerators rather than finely-divided powder mixtures will be more easily handled, transported, and processed. Feed mixtures for both the lime-sinter and HiChlor processes are being studied. A balling disc unit is being used to form agglomerate spheroids. A theoretical analysis of the magnetic separation of fly ash has been completed.
- Research Organization:
- Ames Lab., IA (USA)
- DOE Contract Number:
- W-7405-ENG-82
- OSTI ID:
- 6263056
- Report Number(s):
- IS-4777; ON: DE82003133
- Country of Publication:
- United States
- Language:
- English
Similar Records
Direct utilization: recovery of minerals from coal fly ash. Fossil Energy program. Technical progress report, 1 January-30 March 1980
Direct utilization - recovery of minerals from coal fly ash. Fossil Energy Program. Technical progress report, 1 July 1984-30 September 1984 including summary of work for FY84
Related Subjects
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
ALUMINIUM
MATERIALS RECOVERY
FLY ASH
AGGLOMERATION
SINTERING
WASTE PRODUCT UTILIZATION
FOSSIL-FUEL POWER PLANTS
IRON
LIMESTONE
TITANIUM
CHLORINATION
EXPERIMENTAL DATA
FRACTIONATION
MAGNETIC SEPARATORS
MIXTURES
RESIDUES
SEPARATION PROCESSES
X-RAY DIFFRACTION
AEROSOL WASTES
ASHES
CARBONATE ROCKS
CHEMICAL REACTIONS
COHERENT SCATTERING
CONCENTRATORS
DATA
DIFFRACTION
DISPERSIONS
ELEMENTS
FABRICATION
HALOGENATION
INFORMATION
MANAGEMENT
METALS
NUMERICAL DATA
POWER PLANTS
PROCESSING
RECOVERY
ROCKS
SCATTERING
SEDIMENTARY ROCKS
THERMAL POWER PLANTS
TRANSITION ELEMENTS
WASTE MANAGEMENT
WASTE PROCESSING
WASTES
010800* - Coal
Lignite
& Peat- Waste Management
320305 - Energy Conservation
Consumption
& Utilization- Industrial & Agricultural Processes- Industrial Waste Management