垂直溜井贮矿段放矿中矿岩运动速度变化特征

Variation Characteristics of Ore-rock Movement Velocity During Ore-drawing in the Storage Section of Vertical Orepass

为研究溜井贮矿段放矿过程中矿岩颗粒运动速度变化特征,采用颗粒离散元数值模拟方法,进行了垂直溜井贮矿段放矿试验,分析了溜井贮矿段放矿过程中整体矿岩速度分布及个体速度变化过程。结合时均化分析方法,讨论了矿岩经过筒仓和放矿漏斗时的时均速度变化特征。研究表明:溜井贮矿段放矿过程中矿岩颗粒的瞬时速度始终处于波动状态,其波动特征表现为0~4.0 s内大振幅、波峰波谷明晰;4.0~16.5 s内振幅较小、呈周期性变化;16.5~20.0 s内振幅较大且波峰波谷平均值随时间增长而增大、速度呈明显增长趋势。在筒仓部分矿岩颗粒时均速度接近于恒定,不随放矿时间变化,越靠近筒仓中心线矿岩时均速度越大,到达放矿漏斗所用时间越少;在放矿漏斗部分矿岩颗粒时均速度随放矿时间增加而增大,同时越靠近井壁,时均速度越小,颗粒经过放矿漏斗部分的时均速度明显大于经过筒仓部分的时均速度。

In order to study the velocity variation characteristics of the ore particles in the ore-drawing process of theorepass storage section,the discrete element numerical simulation method is used to carry out the ore-drawing test of the verti-cal 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 orerock passing through silo and drawing funnel are discussed.The study results show that the instantaneous velocity of ore androck particles is always in a state of fluctuation during the ore-drawing process of the chute storage section,which is charac-terized by large amplitude and clear peak and trough in the early stage of 0~4.0 s,and small amplitude and periodic changein 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 initialamplitude is small and the peak and trough is large,the average value increases with time and fluctuates violently,and thenshows 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 ofthe ore rock,and the less time it takes to reach the ore-drawing hopper.The time-homogenization velocity of particles increas-es with the increase of ore-dressing time.At the same time,the closer to the shaft wall,the lower the time-homogenizationspeed.The time-homogenization velocity of the particles passing through the ore-drawing funnel is greater than that of the silo.