Quartzite particles

as a bed material

are used in the high density fluidized bed.However

in the operation

a great amount of fines

due to the attrition of quartzite particles

were elutriated

which would result in the decrease of bed material and bed pressure drop

and herein have an impact on the normal fluidization in the fluidized bed.In view of the attrition of quartzite particles

a mathematic model was established based on the Fleischer’s system energy balance theory about the friction attrition mechanism.The condition that the fine particles were separated from the parent particles was based on the least energy principle of material dynamic failure.The particle’s operation characteristics in the fluidized bed and the particle’s physical properties were also considered in the model.This model could explain some factors of the particle’s attrition.Moreover

the predicted value from the model was close to the experimental value.Therefore

this study would be beneficial to the engineering application of the high density fluidized bed.