Study On Catalytic Graphitization Of Residual Carbon In Gasification Fine Slag

Coal gasification technology is the core technology for clean coal utilization and the foundation of modern coal chemical industry.Gasification fine slag is the waste generated in the process of coal gasification.The gasification fine slag has not been effectively utilized.The massive accumulation of gasification fine slag will seriously damage the ecological environment and endanger human health.The use of resources is an urgent task.At this stage,there is less research on the residual carbon in the gasification fine slag.The gasified fine slag contains high residual carbon,but cannot be burned separately.The residual carbon in the gasified fine slag is used as the carbon source of the graphitized material.Not only can the current situation of low utilization rate of gasification fine slag be improved,but also the source of graphite raw materials can be broadened.This paper explores the feasibility of preparing graphite materials from gasified fine slag.In this paper,Ning xia coal gasification fine slag was selected as the research object.The gasification fine slag was analyzed and characterized by laser particle size analysis,BET,SEM,etc.,and the gasification fine slag was subjected to flotation deashing and acid elution ash.Residual carbon under ash conditions,high temperature graphitization of residual carbon,explored the influence of ash,particle size and temperature on high temperature graphitization in gasified fine slag;on the basis of high temperature graphitization,by mechanical mixing,H₃BO₃ and FeC_l3 were added as catalysts to investigate the effects of catalytic graphitization such as catalyst type,addition amount,particle size and temperature.The main mineral elements in gasified fine slag are Si,Al,Fe and Ca.More ash has a promoting effect on high temperature graphitization.The reduction of particle size can also promote the graphitization process.Temperature is an important factor in the graphitization process.Increasing the temperature is more conducive to the progress of graphitization,and at the same time promotes the growth of graphite crystals.H₃BO₃and FeCl₃ show good catalytic activity in the catalytic graphitization process,which can significantly reduce the activation energy required for graphitization,and achieve higher graphitization degree under relatively low heat treatment conditions.At low temperatures,the catalytic effect of boric acid is not as good as that of FeCl₃,but at high temperatures,the catalytic effect is very significant.The paper has 57 figures,27 tables,and 102 references.