化学机械浆制浆原料中过渡金属离子对其漂白性能的影响

Effects of Transition Metal Ions in Raw Materials on the Bleachability of Chemical Mechanical Pulps

关键词:  化学机械浆  制浆原料  金属离子  碱性H₂O₂漂白  预浸渍溶出物

Key Words:chemical mechanical pulp  pulping material  metal ion  alkaline hydrogen peroxide bleaching  pre-impregnated residue

摘要:本研究以我国化学机械浆生产中主要使用的3种桉木和3种杨木为研究对象，比较了其浆料和预浸渍溶出物中过渡金属离子含量的差异，分析了过渡金属离子含量对浆料漂白性能以及预浸渍溶出物抗氧化性的影响。结果表明，桉木原料中较多的Mn²⁺和杨木中较多的Fe³⁺导致浆料的漂白性能较差；桉木和杨木预浸渍溶出物中较多的Fe³⁺导致二者的抗氧化性较强，由此导致实际生产中化学品消耗量较高；对于完全脱除预浸渍溶出物的浆料，增加螯合剂用量对杨木的漂白性能无显著影响，对桉木的漂白性能有一定提高；对于保留预浸渍溶出物浆料，增加螯合剂用量比增加H₂O₂用量对2种浆料漂白性能的改善作用更明显。

Abstract:In this study， three kinds of eucalyptus woods and three kinds of poplar woods， which were mainly used in the production of chemical mechanical pulp， were compared with the difference of transition metal ion content in the pulp and the pre-impregnated residues. The effects of transition metal ions in the pulp on the bleachability and the effects of metal ions in the pre-impregnated residues on oxidation resistance were analyzed. The results showed that high contents of Mn²⁺ in eucalyptus and the high contents of Fe³⁺ in poplar resulted in poor bleachability of the pulp. The high contents of Fe³⁺ in eucalyptus and poplar pre-impregnated residues led to the strong antioxidant properties， which resulted in high chemical consumption in actual production. For the completely removal of pre-impregnated residues， increasing the dosage of chelating agent had no significant effect on the bleachability of poplar， but had certain improvement on the bleachability of eucalyptus. For fully retained pre-impregnated residues， increasing the dosage of chelating agent had more obvious improvement on the bleachability than increasing the dosage of hydrogen peroxide.