HEDP在废纸浆H2O2漂白过程中的应用

The Application of HEDP in Hydrogen Peroxide Bleaching of Mixed Waste Paper Pulp

关键词:  混合废纸浆  H2O2漂白  羟基乙叉二膦酸  螯合剂  Na2SiO3

Key Words:mixed waste paper pulp  hydrogen peroxide bleaching  chelating agent  HEDP  sodium silicate

摘要:以混合废纸浆为原料,研究了羟基乙叉二膦酸(HEDP)作为螯合剂在废纸浆H2O2漂白中的应用。结果表明,预处理段螯合剂的最佳使用条件为：HEDP用量0.15%,螯合温度60℃,螯合时间45 min。在本实验所获得的HEDP最佳工艺条件下,与EDTA螯合剂的对比实验发现,HEDP的螯合效果优于EDTA的螯合效果；后续漂白段在Na2SiO3用量为3.0%时,可使废纸浆的白度达到76.6%,返黄值降低为1.76%；在HEDP最佳预处理条件下， 在后续H2O2漂白中添加一定量的EDTA可使Na2SiO3的用量降低而不影响纸浆白度和手抄片的返黄值。

Abstract:Mixed waste paper pulp was bleached by using hydrogen peroxide and with 1- hydroxy ethylidene-1, 1-diphosphonic acid(HEDP) as the chelator . The results showed that the optimum conditions of chelating stage was as follows: HEDP dosage 0.15% on OD pulp, temperature 60℃, time 45 min, the HEDP’s chelating efficiency was better than the EDTA under the conditions; The pulp whiteness reached to 76.6%ISO and the PC value decreased to 1.76%; in subsequent hydrogen peroxide bleaching when sodium silicate dosage was 3.0%, adding a certain amount of EDTA could reduce the dosage of sodium silicate without affecting the whiteness and P.C value.