BLEACH FILTRATE RECYCLE IN BLEACHING FOR EUCALYPTUS CHEMIMECHANICAL PULPS
The eucalyptus wood chips are already used on a large scale to produce chemimechanical pulps (CMPs) by many Chinese pulp mills. The bleach filtrate recycling in bleaching for eucalyptus CMPs was investigated. The CMPs used in the experiments have good bleaching responses to hydrogen peroxide with a brightness of more than 80％ ISO at a H2O2 charge of 2％. A positive effect to the pulps brightness, a brightness increase of 0.3 points, is observed of recycling the bleach filtrate once. No obvious negative effect is observed by using multi-time recycling of the filtrate. Compared with that of control bleaching，pulp brightness suffers only a brightness loss of 0.3 points after recycling seven times. The filtrate characters of COD, electrical conductivity, etc, increase gradually with the recycling times at the beginning and level off after five times. The bleach filtrate recycling in bleaching of eucalyptus CMPs can be expected to save 50％ of processing fresh water，and 50％ of Na2SiO3 and 50％ of DTPA without observed negative effects on bleaching efficiency and pulp strength properties.
eucalyptus chemimechanical pulping hydrogen peroxide bleaching bleach filtrate recycle
Shen Kuizhong Fang Guigan Hu Jianmin Jin Li Liang Fangmin Han Shanming
Institute of Chemical Industry of Forest Products,Chinese Academy of Forest, Nanjing, 210042, China
国际会议
广州
英文
454-457
2010-11-08（万方平台首次上网日期，不代表论文的发表时间）