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
The research discussed in this report deals with resource recovery from coal conversion solid wastes. Progress is reported on two methods (the HiChlor and Lime-Sinter processes) for extracting metal values from power plant fly ash. Preliminary work is also reported on a method of making cement from the residue of the lime-sinter process. In the HiChlor Process, metal oxides in the fly ash are converted to volatile chlorides by reaction with chlorine in the presence of a reductant. Several versions of this approach are being investigated. The Lime-Sinter Process utilizes a solid state reaction to selectively convert the alumina in fly ash to a soluble form. Fly ash is mixed with limestone and a suitable mineralizer (to reduce the temperature required for sintering and to enhance alumina recovery) and then sintered in a high temperature kiln. Alumina is recovered by leaching the resulting clinker. A complex relationship between the calcium, alumina, silica, and sulfur constituents in the feed mixture controls the formation and extraction of aluminate compounds. Alumina recovery levels are enhanced by promoting the formation of less-soluble calcium compounds and/or more-soluble aluminum compounds. A study is underway to determine the degree to which flue gas scrubber sludge can be used both as a limestone substitute and as a sulfur bearing mineralizer. Results show that 20 to 25% of the limestone can be provided by the scrubber sludges. 25 refs.,25 figs., 10 tabs.
- Research Organization:
- Ames Lab., IA (USA)
- DOE Contract Number:
- W-7405-ENG-82
- OSTI ID:
- 5868050
- Report Number(s):
- IS-4874; ON: DE85011292
- Resource Relation:
- Other Information: Portions of this document are illegible in microfiche products. Original copy available until stock is exhausted
- Country of Publication:
- United States
- Language:
- English
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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
Direct utilization: recovery of minerals from coal fly ash. Fossil Energy program. Technical progress report, 1 January-30 March 1980
Related Subjects
01 COAL, LIGNITE, AND PEAT
FLY ASH
CHEMICAL COMPOSITION
MATERIALS RECOVERY
HICHLOR PROCESS
RESEARCH PROGRAMS
LIME-SODA SINTER PROCESS
ALUMINIUM
EXPERIMENTAL DATA
FLOWSHEETS
FOSSIL-FUEL POWER PLANTS
IRON
PELLETIZING
REDUCING AGENTS
SCRUBBERS
SLUDGES
X-RAY DIFFRACTION
X-RAY FLUORESCENCE ANALYSIS
AEROSOL WASTES
ASHES
CHEMICAL ANALYSIS
COHERENT SCATTERING
DATA
DIAGRAMS
DIFFRACTION
ELEMENTS
EQUIPMENT
FABRICATION
INFORMATION
MANAGEMENT
METALS
MOLDING
NONDESTRUCTIVE ANALYSIS
NUMERICAL DATA
POLLUTION CONTROL EQUIPMENT
POWER PLANTS
PROCESSING
RECOVERY
RESIDUES
SCATTERING
THERMAL POWER PLANTS
TRANSITION ELEMENTS
WASTE MANAGEMENT
WASTE PROCESSING
WASTES
X-RAY EMISSION ANALYSIS
320305* - Energy Conservation
Consumption
& Utilization- Industrial & Agricultural Processes- Industrial Waste Management
010800 - Coal
Lignite
& Peat- Waste Management