关键词: 油页岩灰渣;发气物质;熔射温度;空心陶瓷微球

Abstract: The hollow ceramic microspheres were prepared using flame spray gun with oil shale ash as experimental material.Thermal analysis of oil shale ash was analyzed by TG-DSC.The microstructure and phase composition of oil shale ash and hollow ceramic microspheres were characterized by SEM and XRD.The results show that the vast majority of microspheres prepared by flame spraying method are spherical , with a small number of irregular shapes , moreover , the hollow structures can be found after the microspheres being broken .The formation mechanism of the hollow microspheres as follows:the bubbles are generated by the substance of producing gas , furthermore a cloud of bubbles coalesces to form larger bubbles in melted oil shale ash powder , finally, the hollow microspheres are formed after cooling solidification .The loose structure of oil shale ash , sufficient gas content and suitable temperature are important factors for the formation of hollow structure .

Key words: oil shale ash;substance of producing gas;melting temperature;hollow ceramic microsphere