基于微米CT的磨介对产物三维形貌影响实验设计

Experimental Design of Effect of Grinding Media on Three-Dimensional Morphology of Products Based on Micro-CT

本文设计研究球形和六棱柱形研磨介质对煤炭破碎产物三维形貌特征影响的实验,具体过程包括不同时间批次煤炭破碎和筛分,基于高分辨三维X射线显微成像系统的粗粒级煤炭无损检测以及基于Dragonfly三维数据分析软件的完整颗粒分割提取和三维形貌特征参数计算等环节。结果显示:在球磨机转速率较低的前提下,钢球和钢锻的总表面积或总质量相同时,钢球作用下物料的初始粒级破碎速率略高于钢锻,且-1 mm细粒级产率最高。研磨作用促使粗粒级物料的体积和表面积降低,3种研磨条件下表面积最大的钢锻对样品的“磨剥”作用最为明显,颗粒球形度最高。

Grinding experiments of coal are designed to study the influence of spherical and cylindrical media on the three-dimensional morphology characteristics of grinding products.Details of experiments consist of coal grinding,screening of grinding produces,non-destructive testing of coarse-grained coal based on high-resolution three-dimensional X-ray microscopic imaging system,and particle segmentation extraction and three-dimensional morphology feature parameter calculation based on the Dragonfly software.For the low rotation rate condition of the ball mill,if the total surface area or total mass of grinding media is the same,breakage rate of the top size particles ground by the grinding ball is higher than that of the cylindrical media.Moreover,the yield of-1 mm fines yielded by the ball is the highest.The grinding effect reduces the volume and surface area of coarse materials.For the three grinding conditions,the steel cylindrical media with the largest surface area has a more significant“grinding and stripping”effect on coal and the highest particle sphericity.