Abstract
Carrier material (mixture of viscous fluid and fine particles, CM) circulation system was proposed to lift up deep sea mineral resources. This study focuses on appropriate mixing proportions of CM for lifting up heavier and coarser ores. The results of model tests of ore lifting demonstrated that CMs of mixture of water, bentonite and sand particles could lift up heavier and coarser ores than those lifted in the conventional system by far lower vertical flow velocities. Moreover, ore lifting efficiencies were found to be improved by restricting movements of CMs around ores via the wall of the vertical pipe.
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