Add time:08/01/2019         Source:sciencedirect.com

Carbide slag modified using ultrasonic technology is used as the calcareous materials for the first time to prepare xonotlite via dynamic hydrothermal synthesis. This paper analyzes the effect of modification conditions on carbide slag activity, crystalline phase composition and morphology of xonotlite. The carbide slag activity and synthesized xonotlite are explored testing sedimentation volume, time of phenolphthalein erubescence, granularity distributing and using XRD and SEM techniques. The results indicate that carbide slag activity is improved by the ultrasonic process at 160 W for 3 h, and carbide slag after proper modification could be used to prepare pure xonotlite. Different ultrasonic times for carbide slag have great impact on the crystallinity and morphology of xonotlite. The xonotlite crystals made up of a large amount of spherical particles are successfully prepared under the conditions of initial CaO/SiO2 mol ratio of 1.0, water/solid weight ratio of 30, at 215 °C for 10 h.

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