STUDY ON THE TCF BLEACHING OF OXALATE CHEMI-MECHANICAL PULP OF WHITE PAPER MULBERRY BARK BASED ON PRESSURIZED HYDROGEN PEROXIDE BLEACHING

摘要

The oxalate chemi-mechanical pulp (OCMP) from white paper mulberry bark was bleached using pressurized hydrogen peroxide bleaching (PO) technique. The results show that the preferable conditions for pressurized hydrogen peroxide bleaching are 10% consistency, 0.6MPa of oxygen pressure, 2.0% H_2O_2, 0.4% Mg_2SO_4, 3.0% Na_2SiO_3, 2.0% NaOH, 110℃, 2h. When the total consumption of H_2O_2 was 3.0%, the brightness of oxalate chemi-mechanical pulp of white paper mulberry bark could increase to 80.2 % ISO from 43.5 % ISO with the A(PO)P bleaching sequence.