文档介绍：PO BLEACHING OF MAGNESIUM- BASED SULFITE PULP
CHEN Chunxia QIU Yugui
Dongguan Quality Supervision Testing Center State Key Laboratory of Pulp and Paper Engineering
GuangDong, Dongguan,523808 South China University of Technology
jane01212000@ Guangzhou, 510640, China
Abstract—This paper mainly studies on the Po bleaching of Before bleaching, pretreatment of the pulp with sulfuric
magnesium-based sulfite bamboo/bagasse pulp, which is
pretreated with sulfuric acid. The experimental results indicate acid (. A) is carried out in polyethylene bags supported in a
that the optimal conditions are as follows: temperature 80℃, constant water bath. The conditions are as follows: the
time 70min, the dosage of Na2SiO3 % and the charge of NaOH consistency of pulp 5%, the charge of H2SO4 1% (on .
%. Under these optimized conditions, the brightness of the ℃
bleached pulp is up to %ISO while the Kappa number is pulp ), temperature 75 , time 20min. Consequently, the
. Evidently, the Po process is an effective bleaching process pretreated pulp is washed with double distilled water. The
with non-pollution, which is suitable for this kind of pulp. content of main metal ions in the pulp, determined by atomic
Keywords- magnesium-based sulfite; bamboo/bagasse pulp; absorption spectrometer, is listed in Table 4.
pretreatment; Po bleaching; non-