Abstract:The efficient sedimentation and concentration process of tailings is a key link in the design of backfill systems. Aiming at the physical and chemical characteristics of Jinsha phosphate ore tailings with fine particle size and containing fatty acid flotation agents, natural settling and flocculation settling tests are conducted. Solid flux and bottom flow concentration are used as evaluation indicators to explore the settling and concentration performance of the tailings, and the types of flocculants, feed concentration of tailings mortar, and dosage of flocculants are determined. In the process of natural settlement of tailings slurry, the extremely fine tail sand particles float up with the agent foam, which leads to the reduction of natural settlement rate and the difficulty of observing the settlement interface; During the static flocculation and settling process of the tailings slurry, the optimal type of flocculant is Eisen 665S, the optimal feed concentration is 10%~14%, and the optimal dosage of flocculant is 20~25 g/t; During the dynamic flocculation and settlement process of tailings slurry, the feed concentration is 12%, the amount of flocculant added is 25 g/t, the rotation speed of the rack is 5 r/h, the concentration of underflow reaches the highest 68%. The research results can provide reference for the sedimentation and concentration parameters of similar phosphate tailings.