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.