李 蒙,付丽敏,罗小林*,黄六莲,陈礼辉.草酸酸洗对麦草氧脱木素浆中铁离子去除及H2O2漂白的影响[J].中国造纸学报,2015,30(1):6-10 本文二维码信息
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草酸酸洗对麦草氧脱木素浆中铁离子去除及H2O2漂白的影响
Effect of Oxalic Acid Washing on the Content of Fe3+ in Oxygen Delignified Wheat Straw Pulp and Its Hydrogen Peroxide Bleaching
  
DOI:10.11981/j.issn.1000-6842.2015.01.6
中文关键词:  草酸酸洗  麦草  氧脱木素浆料  铁离子  过氧化氢漂白
Key Words:oxalic acid washing  wheat straw  oxygen delignified pulp  ferric ion  hydrogen peroxide bleaching
基金项目:
作者单位
李 蒙 福建农林大学材料工程学院福建福州350002 
付丽敏 惠州市质量计量监督检测所广东惠州516003 
罗小林* 福建农林大学材料工程学院福建福州350002 
黄六莲 福建农林大学材料工程学院福建福州350002 
陈礼辉 福建农林大学材料工程学院福建福州350002 
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中文摘要:
      以麦草氧脱木素(O)浆为研究对象,考察了草酸酸洗(AC)对该浆料中铁离子去除率及后续过氧化氢(P)漂白的促进作用。结果表明,当pH值约为3、浆浓4%时,较优的草酸酸洗温度和处理时间分别为60℃和60 min,此时Fe3+的去除率约为40%。这主要是由于草酸除可提供酸性环境外,还可络合Fe3+,降低Fe3+在浆料纤维上的吸附量,改变Fe(OH)3的溶解平衡,在相同氢离子浓度时达到提高Fe3+去除率的目的。浆料卡伯值和黏度相同时,与经OQP和OAS(硫酸酸洗)QP漂后的浆料白度(分别为56.4%和64.5%)相比,经OACQP漂白后浆料白度可达73%,分别提高了30%和13%。
Abstract:
      By using oxygen delignified wheat straw pulp as material, the role of oxalic acid washing (AC) in improving Fe3+ removal and subsequent hydrogen peroxide bleaching efficiency was studied.It was found that Fe3+ removal was about 40% when pH value of washing liquor and pulp consistency were fixed as 3 and 4%, optimal treatment time and temperature of AC were 60 min and 60℃ respectively. In addition to providing acidic environment, oxalic acid could chelate Fe3+, decrease its absorption on pulp and thus change dissolving balance of Fe(OH)3. Based on these functions, the target for improving Fe3+ removal could be achieved by AC. With the same pulp kappa number and viscosity, the brightness of the pulp bleached with the OACQP sequence was 73%, which was higher than those bleached with OQP (56.4%) and OAS(sulfuric acid washing)QP (64.5%) by about 30% and 13%.
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