A new highly efficient conveyance system, which transports reclamation materials using compressed air to gallery in abandoned mine, has been developed. With this new system, the volume density increased more than twice, from 0.37 to 0.79. Moreover, the pressure loss decreased at the rate of 1/150, from 3.28×10
7Pa to 2.25 ×10
5Pa, compared with a conventional slurry conveyance system. In the conventional system, a significant amount of water is added to the reclamation materials. The volume density must be so low, otherwise the reclamation materials is too viscous to be conveyed.
The purpose of this study is to solve the problem inherent in conventional systems; a high performance system requires high volume density, however, the volume density can not be increase because the friction between the reclamation materials and pipe increases with the density.
The essential feature of this new conveyance system is the generation of the fluid dynamic controlled slug flow by mixing reclamation materials with air. The addition of air decreases the friction between reclamation materials and the pipe, resulting in a high volume density system.
Finally, a proper quantity of air has been discussed from the view point of conveyance efficiency.
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