Experimental Study on Flocculating Sedimentation of Tailings Slurry in a Vertical Sand Tank

Some flocculation-sedimentation test were made for tailings slurry of different concentration in a vertical sand tank,by using anionic-polyacrylamide with different molecular mass of 20 million,15.4 million,12 million as flocculant,combining with some amount of inorganic flocculant(FeCl3).Sedimentation rules for tailing sand in the vertical sand tank was studied,and it is concluded that it is better for the vertical sand tank supplied with the sand slurry with a concentration of 20%,by adding 100 g/t flocculant with molecular mass of 15.4 million,with a appropriate pH value around 9.This research result provides a design basis for technique renovation in continuous backfilling with total tailings after sedimentation and clarification in a vertical sand tank.