细粒全尾动态压密与静态压密机理

采用自制深锥模型进行尾矿浓缩实验,研究了全尾在动态与静态条件下的压密效果.当转速为0.05~0.80r·min^-1时尾矿的极限质量分数范围为67.41%~70.73%,而同等条件下静态压密时尾矿的极限质量分数只有55.82%.静态压密主要依靠重力作用;而动态压密时颗粒更加紧密,导水杆形成的通道使多余的水向上移动.理论挤密模型可以反映全尾压密过程,静态压密行为对应于简单立体结构,动态压密行为对应锥体结构.理论计算的两种模型产生的单位高度沉降量为29.32%,实验结果为28.81%,与理论沉降量相差0.51%.

Dynamic compaction and static compaction mechanism of fine unclassified tailings

Compassion experiments of tailings were carried out with a self-made deep cone model, and the compaction effects were investigated under the conditions of dynamic compaction and static compaction. When the rotational speed is 0.05 to 0.80 r·min-1, the limit mass fraction of tailings is in the range of 67.41% to 70.73%; under the same conditions, it is only 55.82% for static compaction. Dynamic compaction has a higher compaction because excess water can move up through the water-guiding rod, but static compaction mainly relies on the gravity. The extrusion process of tailings can be simulated by theoretical extrusion models:the static compaction behavior corresponds to a simple spatial structure, while a cone structure for the dynamic compaction behavior. The theoretical value of unit sedimentation height calculated by the two kinds of models is 29.32%, and the test result is 28.81%, 0.51% lower than the theoretical value.