Research on residual carbon separation technology of coal gasification fine slag and its product characteristics
As a by-product produced by coal gasification process,coal gasification fine slag(CGFS)is rich in residual carbon and various inorganic elements,and has high utilization value.The separation of carbon and ash components is a prerequisite for its resource utilization and harmless disposal,but the low recovery rate of residual carbon greatly restricts its resource utilization.A hydrocyclone was used to classify CGFS,which was combined with spiral separator for gravity separation of CGFS,and the properties of each product were analyzed by using XRD,TG,and SEM.The analysis results showed that when the slurry feed concentration of the hydrocyclone was 7.5％and the feed pressure was 0.06 MPa,the combustible recovery rate was as high as 59.07％,the bottom ash content was 40.17％,and the yield was 36.50％;when the feed slurry flow rate of the spiral separator was 0.6 m3/s,the ash contents of the concentrate,intermediate ore,and tailings were 44.00％,39.49％,and 85.28％,respectively,and the yields were 28.78％,21.45％,and 49.76％,respectively.By optimizing the parameters of the joint sorting process,efficient separation of coal ash could be achieved.Under the optimal separation conditions,the ash contents of the concentrate,intermediate ore,and tailings obtained were 22.83％,51.37％,and 88.04％,respectively.The mineral phases in CGFS were enriched in different products,with Berlin stone,blue spar,and hematite enriched in the concentrate,and least mineral phases in intermediate ore,mainly consisting of quartz and hematite,and spherical glass bodies enriched in the tailings.
coal gasification fine slagspiral separatorcombustible recovery ratephysical and chemical propertiesresource utilization
万方数据
维普
