Experimental study on fluidized attrition characteristics and mechanism of quartz sand particles
A fluidized bed cold experimental system was designed to carry out quartz sand particle attrition ex-periments and investigate the effects of operating parameters,particle properties and other factors on the parti-cle attrition process,focusing on two main mechanisms of particle attrition,fragmentation and abrasion.The results show that both fragmentation and abrasion play a significant role in the rapid attrition stage,the size change rate is large and a large amount of fine powder is produced.Meanwhile,the mass fraction of particles produced by fragmentation is obviously smaller than that of fine powder produced by abrasion,and thus abra-sion is the dominant mechanism.The change rate of particle size increases with the increase of apparent gas velocity,and has no obvious relationship with the initial particle size.After entering the steady-state attrition stage,the dominant attrition mechanism of quartz sand is still abrasion,the fragmentation mechanism has little contribution to the particle fluidization attrition,and the particle size change rate does not change with the ap-parent gas velocity and initial particle size.Based on the experimental data,a mathematical model suitable for predicting fluid attrition of quartz sand particles is proposed.
attritionabrasionfragmentationattrition mechanismmathematical model
万方数据
维普
