Tailings are a slurry of silt-sized residual material derived from the milling of rock. High density (HD) tailings are tailings that have been sufficiently dewatered to a point where they exhibit a yield stress upon deposition. They form gently sloped stacks on the surface when deposited; this eliminates or minimizes the need for dams or embankments for containment. Understanding the flow behaviour of high density tailings is essential for estimating the final stack geometry and overall slope angle. This paper focuses on modelling the flow behaviour of HD tailings using smoothed particle hydrodynamics (SPH) method incorporating a ‘bi-viscosity’ model to simulate the non-Newtonian behaviour. The model is validated by comparing the numerical results with bench scale experiments simulating single or multi-layer deposits in two-dimensions. The results indicate that the model agreed fairly well with the experimental work, excepting some repulsion of particles away from the bottom boundary closer to the toe of the deposits. Novel aspects of the work, compared to other simulation of Bingham fluids by SPH, are the simulation of multilayer deposits and the use of a stopping criteria to characterize the rest state.

Bi-viscosity model, Flume test, Non-newtonian fluid, Smoothed particle hydrodynamics, Tailings
Korea Australia Rheology Journal
Department of Civil and Environmental Engineering

Babaoglu, Y. (Yagmur), & Simms, P. (2017). Simulating deposition of high density tailings using smoothed particle hydrodynamics. Korea Australia Rheology Journal, 29(3), 229–237. doi:10.1007/s13367-017-0024-0