草酸酸洗对麦草氧脱木素浆中铁离子去除及H_2O_2漂白的影响  

Effect of Oxalic Acid Washing on the Content of Fe^(3+) in Oxygen Delignified Wheat Straw Pulp and Its Hydrogen Peroxide Bleaching

作　　者：李蒙[1] 付丽敏[2] 罗小林[1] 黄六莲[1] 陈礼辉[1] 

机构地区：[1]福建农林大学材料工程学院,福建福州350002 [2]惠州市质量计量监督检测所,广东惠州516003

出　　处：《中国造纸学报》2015年第1期6-10,共5页Transactions of China Pulp and Paper

基　　金：国家自然科学基金(31300495);教育部博士点基金(20123515120018);福建省自然科学基金(2013J05041;2014J05028);省教育厅科技计划项目(JK2012015)

摘　　要：以麦草氧脱木素(O)浆为研究对象,考察了草酸酸洗(A_C)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Fe^(3+)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Fe^(3+),降低Fe^(3+)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Fe^(3+)去除率的目的。浆料卡伯值和黏度相同时,与经OQP和OA_S(硫酸酸洗)QP漂后的浆料白度(分别为56.4%和64.5%)相比,经OA_CQP漂白后浆料白度可达73%,分别提高了30%和13%。By using oxygen delignified wheat straw pulp as material,the role of oxalic acid washing（AC） in improving Fe^3＋ removal and subsequent hydrogen peroxide bleaching efficiency was studied.It was found that Fe^3＋ 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 Fe^3＋,decrease its absorption on pulp and thus change dissolving balance of Fe（OH）3.Based on these functions,the target for improving Fe^3＋ removal could be achieved by A_C.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 OA_S（sulfuric acid washing） QP（64.5%） by about 30%and 13%.

关 键 词：草酸酸洗 麦草 氧脱木素浆料 铁离子 过氧化氢漂白 

分 类 号：TS721.4[轻工技术与工程—制浆造纸工程]