Sedimentation of Mill Tailings In Fresh Water and in Sea Water

Sedimentation behaviour of siliceous mill tailings derived from a magnetite-chalcopyrite ore in fresh water, fresh water - sea water mixtures and full-salinity sea waters are compared. Results of batch settling tests are presented in the form of settling curves and solids flux curves. The addition of a few per cent of sea water markedly enhanced the zone sedimentation rate due to particle agglomeration caused by a reduction in zeta potential of the suspended solids. The presence of a small amount of residual, previously magnetized magnetite in the tailings also enhanced agglomeration and sedimentation. The significance of these results to submarine disposal of mill tailings is discussed.
Keywords: Composition of Tailings, fresh water, magnetite, sea water, Zeta Potentials Figure, Mill tailing, Mill Tailings, particles, Residuals, Sedimentation, Settling tests, tailings, Water, Waters
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