Study on Bleaching of De-Inked Pulp
FAS bleaching (F) and conventional H2O2 bleaching (P) as well as TAED activated H2O2 bleaching (PT) of wastepaper de-inked pulp (DIP) were studied in this paper. The results showed that the optimum conditions for FAS bleaching of DIP at 10% consistency were FAS 0.6%, NaOH 0.3%, reaction time 30min, temperature 70°C. Under the same conditions of H2O2 3.0%, NaOH 2.0%, Na2SiO3 3.0％, MgSO4 0.05％, the optimum temperature was 80°C and reaction time 90min for conventional hydrogen peroxide bleaching; the optimum TAED dosage was 1.5%, reaction time 60min, temperature 60°C for TAED activated hydrogen peroxide bleaching. Finally a comparison was made between PTF and PF two-stage bleaching for DIP. The performance of PTF was better than PF.
Zhong Cao, Yinghe He, Lixian Sun and Xueqiang Cao
N. Yun and B. H. He, "Study on Bleaching of De-Inked Pulp", Advanced Materials Research, Vols. 236-238, pp. 1224-1228, 2011