Abstract: In order to study the velocity variation characteristics of the ore particles in the ore-drawing process of the orepass storage section，the discrete element numerical simulation method is used to carry out the ore-drawing test of the vertical orepass storage section. The overall ore velocity during the ore-drawing process of the orepass storage section is analyzed.Combined with the time-homogenization analysis method，the variatioin characteristics of time-homogenization velocity of ore rock passing through silo and drawing funnel are discussed.The study results show that the instantaneous velocity of ore and rock particles is always in a state of fluctuation during the ore-drawing process of the chute storage section，which is characterized by large amplitude and clear peak and trough in the early stage of 0~4.0 s，and small amplitude and periodic change in the middle period of 4.0~16.5 s.When approaching the ore-drawing funnel in the later period of 16.5~20.0 s， the initial amplitude is small and the peak and trough is large，the average value increases with time and fluctuates violently，and then shows an obvious increasing trend.The time-homogenization velocity of the ore particles in the part of silo is close to constant，and does not change ore-dressing time.The closer to the centerline of the silo， the higher the time-homogenization speed of the ore rock， and the less time it takes to reach the ore-drawing hopper.The time-homogenization velocity of particles increases with the increase of ore-dressing time.At the same time， the closer to the shaft wall， the lower the time-homogenization speed.The time-homogenization velocity of the particles passing through the ore-drawing funnel is greater than that of the silo.

Key words: storage section of orepass, instantaneous velocity of ore-rock, time homogenization, fluctuation form