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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 |
收稿日期: |
DOI:10.11980/j.issn.0254-508X.2015.02.008 |
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 |
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摘要点击次数: 7007 |
全文下载次数: 1981 |
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. |
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