Abstract: To solve the non-ideal pressure filtration effect of bottom flow of bauxite flotation tailings from Henan，the underflow slurry dewatering test in the laboratory was conducted using filter aids.Simultaneously，the influence of the residual TLT8840 on bauxite flotation was investigated.The results showed that the promoting effect of TLT8840 is better than that of TLT8850；Preparation of TLT8840 with circulating water has no effect on the working effect.When TLT8840 dosage of 200 g/t，the time of tailings to-be cake can be shortened by 21.43% and cake moisture can be reduced 0.37 percentage points.Residual TLT8840 in filtration may slightly improve the grade and w(Al₂O₃)/w(SiO₂) ratio of concentrate，but have little impact on the recovery of Al₂O₃.TLT8840 has a significant effect of lowering costs and improving efficiency on tailings pressurized filtration.

Key words: Bauxite, Flotation tailings, Filtration, Dewatering, Filter aid TLT8840