Visualization and Assessment of Hang-Up Phenomena Using Vertical Transparent Ore-Pass Models

Limestone is one of the most important mineral resources, and it only that can be fully supplied by domestic producers. Generally, a certain amount ores stored in ore passes temporally after blasting excavation, extraction carried out from bottom pass. However, hang-up phenomena sometimes occurred some cases are recently reported. Once occur, will cause serious problems. In this study, flow experiments vertical were conducted using pass models which was composed transparent acrylic tubes, conditions hang-ups discussed. Since assembled with also possible to observe phenomenon directly. To discuss effect cross-sectional shapes passes, two kinds ore-passes, is, circular square cross-sections, prepared. Using various sizes ores, relation between size area It found almost did not occur when ratio mean grain exceeds value 5. circular-shaped little preferable avoid compared The same procedure applied mixed types different diameters mixed. case, also, results as obtained single-size ores. 3D-DEM analysis conducted, validity