Utilization of fluidized bed combustion ashes as raw material in the production of a special cement

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2009

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Soner, İlker

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Fluidized bed combustion (FBC) ashes containing significant amount of free CaO and CaSO4 in addition to valuable inorganic acidic oxide ingredients such as SiO2, Fe2O3 and Al2O3 can be utilized as potential raw materials in the production of nonexpansive belite-rich calcium sulfoaluminate cement which is one of the special cement type of sulfoaluminate-belite cements having performance characteristics similar to those of ordinary portland cement besides lower energy requirements and CO2 emissions during manufacturing. Therefore, in this thesis study, possibility of producing non-expansive belite-rich calcium sulfoaluminate cement by adding FBC ashes in various proportions to the raw meal was investigated. For this purpose, a raw meal composed a mixture of limestone, bauxite, gypsum together with 10 wt % bottom ash and 15 wt % baghouse filter ash was prepared. It was sintered in a laboratory scale muffle furnace at temperatures of 1200, 1250 and 1300 °C for various holding times. The results of chemical and mineralogical analysis as well as microscopic examination reveal that FBC ashes have the potential to be used in the raw meal due to the presence of characteristic mineral phases of this type of cements, i.e. yeelimite, larnite, ferrite and anhydrite, in the sample obtained at optimum sintering temperature of 1250 °C for 60 min.

Subject Keywords

Chemical engineering., General Civil Engineering.

URI

http://etd.lib.metu.edu.tr/upload/12610651/index.pdf
https://hdl.handle.net/11511/18544

Collections

Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

İ. Soner, “Utilization of fluidized bed combustion ashes as raw material in the production of a special cement,” M.S. - Master of Science, Middle East Technical University, 2009.