用于化机浆过氧化氢漂白的几种新型稳定剂的性能比较

Performance Comparison of Several New Stabilizers for Hydrogen Peroxide Bleaching of Chemi-mechanical Pulp

关键词:  化学机械浆  过氧化氢  漂白稳定剂  结垢现象

Key Words:chemi-mechanical pulp  hydrogen peroxide  bleaching stabilizer  scaling phenomenon

摘要:本研究探讨了3种稳定剂（LS-8838、SB-005和KML）替代传统Na₂SiO₃用于化机浆过氧化氢漂白的可行性及优缺点，优化了漂白稳定剂的使用条件，比较了3种漂白稳定剂与Na₂SiO₃在过氧化氢漂白过程中的结垢现象。结果表明，针对未漂杨木化学机械浆进行过氧化氢漂白，当NaOH用量3%、H₂O₂用量5%、漂白时间60 min时，漂白稳定剂（LS-8838、SB-005、KML）的最佳使用条件均为添加量0.3%、浆浓25%，漂白温度80 ℃。3种漂白稳定剂添加量为0.3%的漂白效果均能达到Na₂SiO₃添加量为1.5%的漂白效果，纸浆白度分别为75.4%、76.4%、74.4%；与Na₂SiO₃漂白相比，残余H₂O₂含量分别提高了62.5%、135.4%和87.5%；纸张抗张指数分别提高了14.3%、18.6%、0.6%。其中SB-005处理过的纸浆白度、纸张抗张强度最佳，但其硅含量较高，结垢现象比较严重；无磷低硅LS-8838与含磷无硅KML的漂白效果（残余H₂O₂含量、白度、强度）也优于Na₂SiO₃的漂白效果，其中LS-8838漂白效果最佳且无结垢现象，可作为Na₂SiO₃的替代品。

Abstract:In this study， the feasibility， advantages and disadvantages of three stabilizers （LS-8838， SB-005 and KML） replacing traditional sodium silicate for hydrogen peroxide bleaching of chemical pulp were discussed. The using conditions of bleaching stabilizers were optimized. The scaling phenomena between these three types bleaching stabilizers and Na₂SiO₃ in hydrogen peroxide bleaching process were compared. The results showed that when the dosage of NaOH was 3%， the dosage of H₂O₂ was 5%， and the bleaching time was 60 min， the optimal dosage of bleaching stabilizer （LS-8838， SB-005， KML） was 0.3%， pulp concentration was 25%， and bleaching temperature was 80 ℃. The bleaching effect with dosage of Na₂SiO₃ of 1.5% could be achieved by adding three bleaching stabilizers with dosage of 0.3%， and the brightness was 75.4%， 76.4% and 74.4%， respectively. The amount of residual H₂O₂ was 62.5%， 135.4% and 87.5%， and the tensile strength of the paper made from it was increased by 14.3%， 18.6% and 0.6%， respectively. Among them， the slurry treated by SB-005 had the best brightness and strength， but its silicon content was higher and the scaling phenomenon was more serious. The bleaching effect （amount of residual H₂O₂， whiteness， and intensity） of LS-8838 and phosphorus-containing silica-free KML was also better than that of Na₂SiO₃， among which LS-8838 had the best bleaching effect and no scaling phenomenon， and could be used as a substitute for sodium silicate.