利用蔗渣浆生产线试产漂白桉木板皮浆的实践

Trial Production of Bleached Eucalyptus Slab Pulp in a Modified Bagasse Pulpline

关键词:  桉木板皮  蔗渣浆  ODEp漂白  生产实践  改造

Key Words:eucalyptus slab  bagasse pulp  O-D-Ep bleaching  production practice  modification

摘要:介绍了某蔗渣浆生产线改产漂白桉木板皮浆的实验室实验和生产线试生产情况。结果表明,桉木板皮的聚戊糖含量较蔗渣的低很多,仅为8.16%,木素含量则与蔗渣的相差不大；通过对蔗渣浆生产线水力洗草机和草片泵进行适当改造,无需增加新的设备投资,即可利用现有生产线生产桉木板皮浆；桉木板皮宜采用低硫化度碱法蒸煮,较适宜的用碱量和蒸煮温度分别为18%~20%(Na₂O计)和170℃；未漂桉木板皮浆ODEp(氧脱木素-二氧化氯漂白-过氧化氢强化碱抽提)漂白较适宜的ClO₂用量为0.8%~1.0%；试生产漂白桉木板皮浆的性能指标可达到GB/T 1678—2007漂白硫酸盐阔叶木浆合格品指标。

Abstract:The trial production of bleached eucalyptus slab pulp in a modified bagasse pulpline was introduced in this paper. The results showed that the pentosans content of eucalyptus slab was only 8.16% and much lower than that of bagasse fiber, but the lignin content of eucalyptus slab was similar to bagasse. The existing bagasse pulp production lines could be used to produce bleached eucalyptus slab pulp without adding any new equipment, only need to make some modification of the hydraulic bagasse washer and pump. Concerning the pulping technology it was better to use low sulfidity alkaline cooking method to digest the eucalyptus slab. And the optimized alkaline dosage (as Na₂O) was 18% to 20% and cooking temperature was 170℃. The suitable ClO₂ dosage in ODEp (oxygen delignification-chlorine dioxide bleach-hydrogen peroxide strengthened alkaline extraction) bleaching sequences was 0.8% to 1.0%. The brightness and viscosity of the final bleached pulp in production practice were better than that in lab, and the quality of the bleached pulp was also very good.