Study on Bleaching of De-Inked Pulp

Abstract:

FAS bleaching (F) and conventional H₂O₂ bleaching (P) as well as TAED activated H₂O₂ bleaching (P_T) 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 P_TF and PF two-stage bleaching for DIP. The performance of P_TF was better than PF.

• Periodical: Advanced Materials Research (Volumes 236-238)
• Pages: 1224-1228
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.236-238.1224
• Online since: May 2011
• Authors: Na Yun, Bei Hai He
• Keywords: Bleaching, FAS, H₂O₂, TAED, Wastepaper De-Inked Pulp

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