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Carbide slag was used as the calcareous materials for the first time to prepare xonotlite via dynamic hydrothermal synthesis.The efiects of infiuential factors including difierent calcination temperatures, pretreatment methods of the carbide slag and process param-eters of hydrothermal synthesis on the microstructure and morphology of xonotlite were explored using XRD and SEM techniques.The results indicate that the carbide slag after proper calcination could be used to prepare pure xonotlite;and difierent calcination tem-peratures have little efiect on the crystallinity of synthesized xonotlite, but have great impact on the morphology of secondary particles.The difierent pretreatment methods of the carbide slag pose great impact on the crystallinity and morphology of secondary particles of xonotlite.Xonotlite was also synthesized from pure CaO under the same experimental conditions as that prepared from calcined carbide slag for comparison.Little amount of impurities in carbide slag has no efiect on the mechanism of hydrothermal synthesizing xonotlite from carbide slag.
Carbide slag was used as the calcareous materials for the first time to prepare xonotlite via dynamic hydrothermal synthesis. The efiects of infiuential factors including difierent calcination temperatures, pretreatment methods of the carbide slag and process param-eters of hydrothermal synthesis on the microstructure and morphology of xonotlite were explored using XRD and SEM techniques. The results indicate that the carbide slag after proper calcination could be used to prepare pure xonotlite; and difierent calcination tem-peratures have little efiect on the crystallinity of synthesized xonotlite, but have great impact on the morphology of secondary particles. The difierent pretreatment methods of the carbide slag pose great impact on the crystallinity and morphology of secondary particles of xonotlite. Xonotlite was also synthesized from pure CaO under the same experimental conditions as that prepared from calcined carbide slag for comparison. of impurities in carbide slag h as no efiect on the mechanism of hydrothermal synthesizing xonotlite from carbide slag.