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

Technical Report · Fri Mar 01 04:00:00 EST 1985

OSTI ID:5868050

Burnet, G; Murtha, M J; Benson, J D

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
• 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
ASHES
CHEMICAL ANALYSIS
CHEMICAL COMPOSITION
COHERENT SCATTERING
DATA
DIAGRAMS
DIFFRACTION
ELEMENTS
EQUIPMENT
EXPERIMENTAL DATA
FABRICATION
FLOWSHEETS
FLY ASH
FOSSIL-FUEL POWER PLANTS
HICHLOR PROCESS
INFORMATION
IRON
LIME-SODA SINTER PROCESS
MANAGEMENT
MATERIALS RECOVERY
METALS
MOLDING
NONDESTRUCTIVE ANALYSIS
NUMERICAL DATA
PELLETIZING
POLLUTION CONTROL EQUIPMENT
POWER PLANTS
PROCESSING
RECOVERY
REDUCING AGENTS
RESEARCH PROGRAMS
RESIDUES
SCATTERING
SCRUBBERS
SLUDGES
THERMAL POWER PLANTS
TRANSITION ELEMENTS
WASTE MANAGEMENT
WASTE PROCESSING
WASTES
X-RAY DIFFRACTION
X-RAY EMISSION ANALYSIS
X-RAY FLUORESCENCE ANALYSIS