ABSTRACT

In this study, the energy efficiency of three alternative grinding media including, coarse silica beads, fine silica beads, and granular sand, were evaluated and compared against standard stainless steel. Stirred mill test results show that both silica beads and granular sand were more efficient than stainless steel in producing ultrafine particles following the order of coarse silica beads>granular sand>fine silica beads>stainless steel. The finest product size corresponding to a P₈₀ value of 2.33 μm was generated by coarse silica beads with a nominal size of 420 × 1190 μm, which also consumed the least amount of grinding energy. The specific energy input was reduced by almost 50% as opposed to that of stainless steel, while the operating work index was reduced by 87%. Overall, the test data indicate that grinding media density, media particle size and shape all play a role in determining the optimized grinding behavior of the coal material.

摘要

在这项研究中，评估了三种替代研磨介质（包括粗二氧化硅珠、细二氧化硅珠和粒砂）的能源效率，并与标准不锈钢进行了比较。搅拌磨试验结果表明，硅珠和粒砂均比不锈钢更有效地生产超细颗粒，其顺序为粗硅珠>粒砂>细硅珠>不锈钢。_{与 P 80}对应的最佳产品尺寸标称尺寸为 420 × 1190 μm 的粗二氧化硅珠产生 2.33 μm 的值，这也消耗了最少的研磨能量。与不锈钢相比，单位能量输入降低了近50%，而运行工作指数降低了87%。总体而言，测试数据表明，研磨介质密度、介质粒度和形状都在决定煤材料的优化研磨行为中发挥作用。