Belite cement clinker from coal fly ash of high Ca content. Optimization of synthesis parameters.
The optimization of parameters of synthesis of belite cement clinker from coal fly ash of high Ca content is presented in this paper. The synthesis process is based on the hydrothermal-calcination-route of the fly ash without extra additions. The hydrothermal treatment was carried out in demineralized water and a 1 M NaOH solution for 4 h at the temperatures of 100 degrees C, 150 degrees C, and 200 degrees C. The precursors obtained during the hydrothermal treatmentwere heated at temperatures of 700 degrees C, 800 degrees C, 900 degrees C, and 1000 degrees C. The changes of fly ash composition after the different treatments were characterized by X-ray diffraction (XRD), FT infrared (FTIR) spectroscopy, surface area (BET-N2), and thermal analyses. From the results obtained we concluded that the optimum temperature of the hydrothermal treatment was 200 degrees C, and the optimum temperature for obtaining the belite cement clinker was 800 degrees C.
Guerrero
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Instituto de Ciencias de la Construcción Eduardo Torroja--(CSIC), Serrano Galvache s/n, 28033 Madrid, España. aguerrero@ietcc.csic.es
Goñi
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S
Campillo
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I
Moragues
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D002118:Calcium / Q000737:chemistry*; D002244:Carbon; D003031:Coal; D060729:Coal Ash; D003247:Conservation of Natural Resources; D003252:Construction Materials; D007220:Industrial Waste; D052638:Particulate Matter; D017550:Spectroscopy, Fourier Transform Infrared; D013696:Temperature; D014961:X-Ray Diffraction
D003031:Coal; D060729:Coal Ash; D007220:Industrial Waste; D052638:Particulate Matter; D002244:Carbon; D002118:Calcium