Low-alumina portland cement from lime-soda sinter residue
A byproduct for the Ames Lime-Soda Sinter Process for recovering alumina from power plant fly ash was investigated as a cement raw material. This investigation dealt with a determination of the best method to utilize the process residue from both a clinker quality and an economic perspective. The experimental work was divided into 4 major areas; characterization of the sinter residue, laboratory burnability tests, physical testing of produced residue-cements, and a kinetic study of C{sub 3}S formation. Other important topics were considered such as the effect use of the sinter residue has on the energy requirements of a commercial cement kiln and on the economics of a combined lime-soda sinter, cement plant. It was found that a low-alumina, C{sub 3}S-bearing cement could be readily produced from a raw mix containing significant amounts of sinter residue, which was found to consist of {beta}-C{sub 2}S, C{sub 3}A, CaCO{sub 3}, MgO, and C{sub 4}AF. Based on an energy balance using a typical cement feed containing around 75%{sub w} limestone as a reference, use of the residue in a cement feed allows for a 50% reduction in required energy for the kiln and a 32%{sub w} increased throughput. A laboratory produced residue-cement was found to meet all of the specifications for a Type 5 portland cement. The rate of return found for a combined lime-soda sinter and cement facility processing 43,800 tons per year (TPY) of alumina and 530,400 TPY of portland cement was 4.7%.
- Research Organization:
- Iowa State Univ. of Science and Technology, Ames, IA (USA)
- OSTI ID:
- 5752642
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
010800* -- Coal
Lignite
& Peat-- Waste Management
ACTIVATION ENERGY
AEROSOL WASTES
ALUMINIUM
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
ASHES
BUILDING MATERIALS
CARBON COMPOUNDS
CARBON SULFIDES
CEMENTS
CHALCOGENIDES
CHEMICAL ANALYSIS
CORROSION RESISTANCE
ECONOMICS
ELEMENTS
ENERGY
ENERGY CONSUMPTION
FLY ASH
KILNS
LIME-SODA SINTER PROCESS
MANAGEMENT
MATERIALS
MATERIALS RECOVERY
MATERIALS TESTING
METALS
OXIDES
OXYGEN COMPOUNDS
PORTLAND CEMENT
PROCESSING
RECOVERY
RESIDUES
SOLID WASTES
SPECIFICATIONS
SULFATES
SULFIDES
SULFUR COMPOUNDS
SYNTHESIS
TESTING
WASTE MANAGEMENT
WASTE PROCESSING
WASTE PRODUCT UTILIZATION
WASTES