Abstract: In order to shorten the settling time of pulp in a concentrator，the effects of different floc⁃ culants and dosages on the settling performance of pulp with different concentrations are tested.The test re⁃ sults show that the flocculant FN40H has excellent sedimentation performance in slurry sedimentation， which can significantly accelerate the sedimentation rate and increase the concentration of the bottom con⁃ centrated layer. At the same time，flocculant dosage，slurry concentration and other factors have a signifi⁃ cant impact on the sedimentation performance.Through the orthogonal test，it is found that 1 g/m3 FN40H flocculant can achieve efficient sedimentation of the pulp in the concentrator pulp with a concentration of 10%.

Key words: pulp sedimentation, flocculant, sedimentation rate, concentrated layer concentration