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

Technical Report · Tue Sep 01 04:00:00 EDT 1981

OSTI ID:6263056

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

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

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
AGGLOMERATION
ALUMINIUM
ASHES
CARBONATE ROCKS
CHEMICAL REACTIONS
CHLORINATION
COHERENT SCATTERING
CONCENTRATORS
DATA
DIFFRACTION
DISPERSIONS
ELEMENTS
EXPERIMENTAL DATA
FABRICATION
FLY ASH
FOSSIL-FUEL POWER PLANTS
FRACTIONATION
HALOGENATION
INFORMATION
IRON
LIMESTONE
MAGNETIC SEPARATORS
MANAGEMENT
MATERIALS RECOVERY
METALS
MIXTURES
NUMERICAL DATA
POWER PLANTS
PROCESSING
RECOVERY
RESIDUES
ROCKS
SCATTERING
SEDIMENTARY ROCKS
SEPARATION PROCESSES
SINTERING
THERMAL POWER PLANTS
TITANIUM
TRANSITION ELEMENTS
WASTE MANAGEMENT
WASTE PROCESSING
WASTE PRODUCT UTILIZATION
WASTES
X-RAY DIFFRACTION