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| Effect of Oxalic Acid Washing on the Content of Fe3+ in Oxygen Delignified Wheat Straw Pulp and Its Hydrogen Peroxide Bleaching |
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| DOI：10.11981/j.issn.1000-6842.2015.01.6 |
| Key Words:oxalic acid washing； wheat straw； oxygen delignified pulp； ferric ion； hydrogen peroxide bleaching |
| Author Name | Affiliation | | LI Meng | College of Material Engineering，Fujian Agriculture and Forestry University， Fuzhou，Fujian Province， 350002； | | FU Li-min | Huizhou Quality & Measuring Supervision Testing Institute， Huizhou，Guangdong Province， 516003 | | LUO Xiao-lin* | College of Material Engineering，Fujian Agriculture and Forestry University， Fuzhou，Fujian Province， 350002； | | HUANG Liu-lian | College of Material Engineering，Fujian Agriculture and Forestry University， Fuzhou，Fujian Province， 350002； | | CHEN Li-hui | College of Material Engineering，Fujian Agriculture and Forestry University， Fuzhou，Fujian Province， 350002； |
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| 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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