高黏性物料粉矿仓气力清堵助流系统的设计与应用

为了研究物料性质、粉矿仓结构对物料流动能力的影响以及高黏性物料在粉矿仓内部堵塞的解决方案，基于Jenike剪切理论，分析了和尚桥选矿厂粉矿仓内物料的含水率、粒度对物料内摩擦角的影响以及 粉矿仓半顶角、卸料口尺寸对物料流动性能的影响。结果表明：粉矿仓内物料的内摩擦角随含水率的增加而增大，当含水率在10%~11%时，其内摩擦角达到最大值47.2°，而后随含水率的增加逐渐减小；物料的内摩擦 角随粒度的增大逐渐减小，当粒度大于3 mm，内摩擦角变化趋于平缓，稳定在42°左右；半顶角和卸料口尺寸设计不合理极易造成仓堵现象发生。基于上述研究结果，针对粉矿仓的堵塞提出一种气力清堵助流方案， 应用结果表明：粉矿仓的有效容积率和有效储矿量提升40%以上，在年处理量为500万t的前提下，可为选矿厂增加1 400余万元效益。

Design and Application of Pneumatic Cleaning and Flow Aid System for High Viscosity Material Silo

In order to study the effect of material properties and silo structure on material flow capacity， and solutions for high-viscosity materials blocking inside the silo，the influence of the water content and particle size of the material in the fine ore silo of the Heshangqiao Concentrator on the friction angle of the material and the influence of the semi-top angle of the silo and the size of the discharge port on the flow performance of the material were analyzed based on Jenike shear theory.The results showed that the internal friction angle of the materials in the powder ore silo increases with the increase of the water content， when the water content between 10% and 11%， the internal friction angle reaches the maximum value of 47.2°， and then gradually decreases with the increase of the water content. The internal friction angle of the material gradually decreases with the increase of the particle size. When the particle size exceed 3 mm， the change of the internal friction angle tends to be gentle， stable at about 42°. The unreasonable design of the semi-top angle and the size of the discharge port can easily cause the blockage of the warehouse.Based on the above research results， a pneumatic cleaning and flow aid scheme is proposed aiming at the blockage of the powder ore silo. The results showed the effective volume ratio and effective reserves of the powder ore silo are increased by more than 40%，which increases the benefits of more than 14 million yuan for the concentrator under the premise of an annual processing capacity of 5 million tons.