Use of commercial limestone and other commercially available raw materials in the lime-soda sinter process for the extraction of alumina from a sub-bituminous western coal fly ash

Technical Report · Thu Oct 01 00:00:00 EDT 1981

OSTI ID:5863632

El-Hout, A A

The study of commercial limestone in the Lime-Soda Sinter process has shown that high alumina recoveries are possible using high grade limestones. High recovery sinter compositions using limestone appear to be in the same region as those performed with calcium carbonate reagent, and thus the results demonstrate that high grade limestone can be used as a substitute. Magnesium oxide is a relatively inert material in the sinter reactions. Dolomitic limestones can be used but only the calcium carbonate portion of the rock is reactive. Potassium carbonate is reactive and can replace soda ash; therefore, it is expected that credit can be taken for both Na/sub 2/O and K/sub 2/O contained in fly ashes, limestones, kiln dusts, etc., to decrease the amount of soda ash which must be added to sinter mixtures. Sodium chloride cannot substitute for sodium carbonate; the chloride ion is probably detrimental in the sinter reaction. Synthetic Trona was shown to be an excellent substitute for sodium carbonate. Kiln dust can be used as a suitable lime substitute. The particle size of the limestone is an important factor in the investigation of the maximum yield of aluminum.

• Research Organization: Ames Lab., IA (USA)
• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 5863632
• Report Number(s): IS-T-972
• Resource Relation: Other Information: Thesis
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
ALUMINIUM
MATERIALS RECOVERY
FLY ASH
LIME-SODA SINTER PROCESS
MATERIAL SUBSTITUTION
CALCIUM CARBONATES
CHEMICAL ANALYSIS
DOLOMITE
LIMESTONE
MAGNESIUM OXIDES
POTASSIUM CARBONATES
SODIUM CARBONATES
SYNTHETIC ROCKS
TRONA
AEROSOL WASTES
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
ASHES
CALCIUM COMPOUNDS
CARBON COMPOUNDS
CARBONATE ROCKS
CARBONATES
CHALCOGENIDES
ELEMENTS
MAGNESIUM CARBONATES
MAGNESIUM COMPOUNDS
MANAGEMENT
MATERIALS
METALS
MINERALS
OXIDES
OXYGEN COMPOUNDS
POTASSIUM COMPOUNDS
PROCESSING
RECOVERY
RESIDUES
ROCKS
SEDIMENTARY ROCKS
SODIUM COMPOUNDS
SODIUM MINERALS
SYNTHETIC MATERIALS
WASTE MANAGEMENT
WASTE PROCESSING
WASTES
010800* - Coal
Lignite
& Peat- Waste Management
320305 - Energy Conservation
Consumption
& Utilization- Industrial & Agricultural Processes- Industrial Waste Management