溜井底部放矿漏斗角对矿石流动性的影响研究

摘要

In order to research the effect of drawing funnel angle at the bottom of the ore-pass on ore fluidity in ore-pass,-480 m to-410 m section of the main ore-pass in Jinshandian Iron Mine is taken as the engineering background,and the PFC2D discrete element software is used to simulate the ore drawing process,of which the drawing funnel angles are 45 °,50°,55°,60° and 65° respectively.For describing quantitatively the difference of ore fluidity under different ore drawing funnel angles,the ore mass flow rate ratio is defined as the evaluation index of ore fluidity.The characteristics of ore fluidity under every drawing funnel angle are analyzed and the effect mechanism of drawing funnel angle on the ore fluidity is revealed.Ore drawing similarity test platform is constructed and ore drawing similarity simulation tests under different drawing funnel angles are carried out.The mass flow rate ratios are calculated and compared with numerical simulation.The results show that the ore mass flow rate ratio is the largest and the ore fluidity is the best when the ore funnel angle is 60 degree;Variation tendency of ore mass flow rate ratios of similarity tests and numerical simulation are almost identical.The results of numerical simulation can be verified by similarity test.%为研究溜井底部放矿漏斗角对矿石流动性的影响,以金山店铁矿-480 ～-410 m段主溜井为工程背景,采用PFC2D离散元软件对放矿漏斗角分别为45°、50°、55°、60°、65°的主溜井放矿过程进行数值模拟.为定量描述不同放矿漏斗角下矿石流动性之间的差异,定义矿石质量流率比为矿石流动性评价指标,分析各放矿漏斗角下的矿石流动性特征,揭示放矿漏斗角对矿石流动性的影响机理.构建溜井放矿相似试验平台,进行溜井放矿相似模拟试验,计算矿石的质量流率比,并将其与数值模拟结果进行对比分析.研究结果表明:当放矿漏斗角为60°时,矿石质量流率比最大,矿石流动性最好;相似试验与数值模拟所得矿石质量流率比的变化趋势基本相同,相似试验结果能对数值模拟结果进行验证.