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| Effects of Transition Metal Ions in Raw Materials on the Bleachability of Chemical Mechanical Pulps |
| Received:July 12, 2024 |
| DOI：10.11980/j.issn.0254-508X.2024.12.011 |
| Key Words:chemical mechanical pulp pulping material metal ion alkaline hydrogen peroxide bleaching pre-impregnated residue |
| Fund Project:国家自然科学基金面上项目“竹材机械浆中顽固发色基团的结构特点及其脱除机理研究”（32271974）；泰山产业领军人才工程专项经费（tscy20200213）。 |
| Author Name | Affiliation | Postcode | | JIAO Ting | Jiangsu Key Lab of Biomass Energy and Material, Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Key Lab of Chemical Engineering of Forest Products, National Forestry and Grassland Administration, National Engineering Research Center of Low-Carbon Processing and Utilization of Forest Biomass, Institute of Chemical Industry of Forestry Products, CAF, Nanjing, Jiangsu Province, 210042 | 210042 | | ZHAO Zhikun | Yunnan Yunjing Forestry and Paper Industry Co., Ltd., Pu’er, Yunnan Province, 666199 | 666199 | | ZHU Beiping | Jiangsu Key Lab of Biomass Energy and Material, Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Key Lab of Chemical Engineering of Forest Products, National Forestry and Grassland Administration, National Engineering Research Center of Low-Carbon Processing and Utilization of Forest Biomass, Institute of Chemical Industry of Forestry Products, CAF, Nanjing, Jiangsu Province, 210042 | 210042 | | JIAO Jian* | Jiangsu Key Lab of Biomass Energy and Material, Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Key Lab of Chemical Engineering of Forest Products, National Forestry and Grassland Administration, National Engineering Research Center of Low-Carbon Processing and Utilization of Forest Biomass, Institute of Chemical Industry of Forestry Products, CAF, Nanjing, Jiangsu Province, 210042 | 210042 | | FANG Guigan* | Jiangsu Key Lab of Biomass Energy and Material, Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Key Lab of Chemical Engineering of Forest Products, National Forestry and Grassland Administration, National Engineering Research Center of Low-Carbon Processing and Utilization of Forest Biomass, Institute of Chemical Industry of Forestry Products, CAF, Nanjing, Jiangsu Province, 210042
Shandong Huatai Paper Co., Ltd., Dongying, Shandong Province, 257335 | 257335 | | DENG Yongjun | Jiangsu Key Lab of Biomass Energy and Material, Jiangsu Co-Innovation Center of Efficient Processing and Utilization of Forest Resources, Key Lab of Chemical Engineering of Forest Products, National Forestry and Grassland Administration, National Engineering Research Center of Low-Carbon Processing and Utilization of Forest Biomass, Institute of Chemical Industry of Forestry Products, CAF, Nanjing, Jiangsu Province, 210042 | 210042 | | ZHANG Fengshan | Shandong Huatai Paper Co., Ltd., Dongying, Shandong Province, 257335 | 257335 |
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| Abstract:In this study， three kinds of eucalyptus woods and three kinds of poplar woods， which were mainly used in the production of chemical mechanical pulp， were compared with the difference of transition metal ion content in the pulp and the pre-impregnated residues. The effects of transition metal ions in the pulp on the bleachability and the effects of metal ions in the pre-impregnated residues on oxidation resistance were analyzed. The results showed that high contents of Mn2+ in eucalyptus and the high contents of Fe3+ in poplar resulted in poor bleachability of the pulp. The high contents of Fe3+ in eucalyptus and poplar pre-impregnated residues led to the strong antioxidant properties， which resulted in high chemical consumption in actual production. For the completely removal of pre-impregnated residues， increasing the dosage of chelating agent had no significant effect on the bleachability of poplar， but had certain improvement on the bleachability of eucalyptus. For fully retained pre-impregnated residues， increasing the dosage of chelating agent had more obvious improvement on the bleachability than increasing the dosage of hydrogen peroxide. |
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