The lime-soda sinter process for resource recovery from fly ash: A new look
- Ames Laboratory, and Iowa State University, Ames, IA (United States)
The lime-soda sinter process is one of the earliest and most thoroughly researched and evaluated of the several methods available for resource recovery from fly ash. The principle product, metallurgical grade alumina, is obtained with yields as high as 90% depending upon how much alumina needs to be left in the residue to form acceptable byproduct cement clinker. The process has the advantages of requiring a relatively low sintering temperature (1100-1200°C), using conventional equipment of carbon steel construction, utilizing a variety of calcium and mineralizer raw materials, and producing only a single byproduct consisting of dicalcium silicate that has been shown to be an attractive raw material for the manufacture of portland cement. An economic feasibility study for a combined facility to produce alumina and cement from the fly ash generated by a 1000 MWe coal-fired power station shows a 10.5% return on average investment. This is increased to 14.2% when a disposal charge of $$\$$$$10/ton of fly ash consumed is credited to the process. Research has shown that the soda ash can be replaced by coal cleaning refuse or that the soda ash and one-fourth of the limestone can be replaced by FGD sludge with a savings in raw material cost in both cases. The return on average investment becomes 14.5% when the refuse is used and 15.2% when the sludge is used. The return could be increased further if an inexpensive fluxing agent were substituted for the alumina deliberately left in the residue.
- Research Organization:
- Ames Laboratory (AMES), Ames, IA (United States)
- Sponsoring Organization:
- USDOE Office of Fossil Energy and Carbon Management (FECM)
- DOE Contract Number:
- W-7405-ENG-82
- OSTI ID:
- 5747435
- Report Number(s):
- IS-M--664; CONF-910171--1; ON: DE91011904
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
010800* -- Coal
Lignite
& Peat-- Waste Management
AEROSOL WASTES
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
ASHES
BUILDING MATERIALS
CAPITALIZED COST
CEMENTS
CHALCOGENIDES
CHEMICAL COMPOSITION
CHEMICAL REACTIONS
COAL PREPARATION
COST
DESULFURIZATION
DIAGRAMS
ECONOMICS
ENERGY FACILITIES
FEASIBILITY STUDIES
FLOWSHEETS
FLUE GAS
FLY ASH
FOSSIL-FUEL POWER PLANTS
GASEOUS WASTES
INDUSTRIAL PLANTS
LIME-SODA SINTER PROCESS
MANAGEMENT
MATERIAL BALANCE
MATERIALS
MATERIALS RECOVERY
OPERATING COST
OXIDES
OXYGEN COMPOUNDS
POWER PLANTS
PROCESSING
PROFITS
RECOVERY
RESIDUES
RESOURCE RECOVERY FACILITIES
SIZE
SLUDGES
SOLID WASTES
TAILINGS
TECHNOLOGY ASSESSMENT
THERMAL POWER PLANTS
WASTE DISPOSAL
WASTE MANAGEMENT
WASTE PROCESSING
WASTE PROCESSING PLANTS
WASTE PRODUCT UTILIZATION
WASTES