Abstract: Coal gasification technology is an important technology for the efficient and clean conversion and utilization of coal.Its inorganic components account for about 20%,which is mainly discharged in the form of gasification ash and slag( gasification filter cake and coarse slag),and especially the content ofcarbon in gasification filter cake is about 20-50%,which is the key technical bottleneck of resource utilization.Due to the lack of in-depth analysis of the microscopic physical and chemical properties of carbon in gasification ash and slag,the carbon removal efficiency is low and the cost is high,and the resource utilization is difficult.At present,it is mainly handled by stacking,resulting in serious environmental pollution. In the view of the above problems,the gasification filter cake obtained from entrained flow gasification of a company in Inner Mongolia was taken as the research object in this study.XRD spectrum refinement,particle size analyzer,scanning electron microscope,carbon and sulfur analyzer,thermogravimetric analyzer,ash melting point analyzer and other methods were adopted to study and analyze the elements/minerals phase composition,carbon crystallinity,the distribution of carbon in different particle sizes,the morphology and microstructure of carbon and inorganic phase,the weight loss range of carbon,and the reactivity of gasification filter cake.The results show that the carbon in the gasification filter cake is mainly composed of amorphous carbon with high reactivity and inert graphite carbon with the proportions of 92.94% and 7.06% respectively,which is mainly determined by the type of coal and gasification conditions.The morphology of carbon in the gasification filter cake includes flocculent carbon particles which exist alone and irregular carbon particles fused with inorganic components.The fine particles have a high carbon content and the coarse particles have a high inorganic component content.Under the condition of 500-700 ℃,a weight loss bythermogravimetric analysis is up to 27.38%,which is consistent with the results of carbon and sulfur analysis and muffle furnace loss of ignition,indicating that this part of the loss of ignition is mainly caused by the pyrolysis of carbon at high temperature.Through the analysis of ash melting point,it is found that the softening temperature is 1 130 ℃ and the flow temperature is 1 247 ℃ .The reactivity is high in the range of coal gasification temperature.It can be used for circulation of blending combustion to realize efficient recovery and utilization of carbon resources.