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Title: 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 bemore » 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.« less
Authors:
; ;
Publication Date:
OSTI Identifier:
5868050
Report Number(s):
IS-4874
ON: DE85011292
DOE Contract Number:
W-7405-ENG-82
Resource Type:
Technical Report
Resource Relation:
Other Information: Portions of this document are illegible in microfiche products. Original copy available until stock is exhausted
Research Org:
Ames Lab., IA (USA)
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; 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