Research on enhanced gravity sorting of coal rock components of Shendong low-rank bituminous coal
In order to separate and enrich coal and rock components more effectively,based on the industrial analysis,elemental analysis,and surface morphology analysis of coal samples,the influence of rod milling time on the dissociation and enrichment of coal and rock components,and the effect of each influencing factor in the enhanced gravity separation were investigated through rod milling test and enhanced gravity separation test,and the orthogonal optimisation of the factors in the enhanced gravity separation was carried out.The results showed that with the increase of rod milling time,the 0.500-0.250 mm particle size gradually decreased,and when the milling time was increased to 30 min,the 0.500-0.250 mm particle size no longer occurred,and at the same time,the ash content of the rod milled product showed a decreasing trend with the decrease of the particle size,especially the ash content with particle size less than 0.045 mm decreased from 14.81％to 8.62％;when the rod milling process was carried out for 10 min,components with densities less than 1.35 g/cm3 and greater than 1.40 g/cm3 showed significant changes in yield and ash content,which was more conducive to the effective separation and enrichment of the subsequent coal rock components,and the vitrinite content was the highest in the density grades less than 1.35 g/cm3 when the grinding time was 10 min;the rotational frequency had a more significant effect on the Rv and Ev,after the optimisation of factor levels by the Box-behnken orthogonal test,the recovery rate and enrichment ratio of vitrinite could reach 71.61％and 1.15,respectively,and the effect of enhanced gravity sorting of low-rank coal rock components was remarkable.
low-rank bituminous coalcoal rock componentsdissociation characteristicscentrifugal sorting
万方数据
维普
