| Abstract:In order to optimize retention and drainage performance of the deinked pulp using in newsprint production, the retention and drainage effects of multi-components system containing nanosized TiO2 were studied. The results showed that the drainage time was 13 s, and the retention rate was 93.4% when the dosage of nanosized TiO2 was 0.20% in a nanosized TiO2-AmS dual system. Among the ternary systems, the formula containing CS(0.4%)，APAM(0.01%) and nanosized TiO2 (0.2%) had the best drainage performance, the drainage time was 17 s，and the formula containing CS(0.4%)，CPAM(0.01%) and nanosized TiO2 (0.2%) had the best retention result, the total retention rate was 97.5%. It was found that the multi-component system containing nanosized TiO2 have good effect on retention and drainage due to the three dimensional structure, providing more combination chances for the fibres and DCS in the system of AmS and CS, on the other hand PAM system provides good retention and drainage through more bridging flocculation，charge neutralization and patching. |
