Flow properties of paste were investigated by means of transport tests using pipelines of 4 and 8 inches in diameter at Toyoha Mine.
In addition to full-scale tests at the mime, laboratory tests using small-scale pipes and a viscometer were conducted. The experimental results show that the flow properties of the pastes could be approximated by the Bingham plastic model; however, the flow of the paste in the full-scale pipeline was different from the flow in the small-scale pipes due to the Schwedoff region at low shear velocity. In order to express the wall shear stresses over a wide range of shear velocity, the Papanastasiou's model was introduced. The shear stresses of paste flows over a wide range of shear velocity including the Schwedoff region were satisfactorily estimated by this model.