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| Study on Calcium Migration During the Pulping Process of Pteroceltis tatarinowii Bark Used as a Fiber Raw Material for Xuan Paper |
| Received:January 12, 2026 Revised:February 08, 2026 |
| DOI：10.11980/j.issn.0254-508X.2026.04.014 |
| Key Words:Xuan paper Pteroceltis tatarinowii bark calcium migration occurrence forms |
| Author Name | Affiliation | Postcode | | GUO Yu* | 1School of Light Industry and Engineering, National Engineering Research Center of Papermaking and Pollution Control, South China University of Technology, Guangzhou, Guangdong Province, 510640 | 510640 | | LIU Mengru* | 1School of Light Industry and Engineering, National Engineering Research Center of Papermaking and Pollution Control, South China University of Technology, Guangzhou, Guangdong Province, 510640 | 510640 | | GAO Qichao | 2Institute of Advanced Technology, South China University of Technology, Guangzhou, Guangdong Province, 511442 | 511442 | | YANG Wenbo | 1School of Light Industry and Engineering, National Engineering Research Center of Papermaking and Pollution Control, South China University of Technology, Guangzhou, Guangdong Province, 510640 | 510640 | | LI Hailong | 1School of Light Industry and Engineering, National Engineering Research Center of Papermaking and Pollution Control, South China University of Technology, Guangzhou, Guangdong Province, 510640 | 510640 |
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| Abstract:Pteroceltis tatarinowii bark， is considered beneficial for inhibiting paper aging and improving durability of Xuan paper. To investigate the migration and transformation of calcium during the pulping process of Pteroceltis tatarinowii bark， samples were taken at key stages including soaking， cooking， and bleaching separately. Sequential chemical extraction and compositional analyses were employed to systematically determine the calcium content in Pteroceltis tatarinowii bark (pulp) samples and pulping effluents from different processing stages. Combined with observations of calcium crystal distribution and morphology， the migration behavior， occurrence forms， and structural evolution of calcium during pulping were clarified. The results showed that calcium exhibited a trend of “initial loss followed by later enrichment” during the pulping process， and its occurrence gradually changed from endogenous bound calcium to externally introduced calcium salt deposits. After soaking and cooking， endogenous calcium in the Pteroceltis tatarinowii bark was released together with pectin and other components， resulting in a decrease in calcium content from 21.90 g/kg to 17.23 g/kg. During the bleaching stage， calcium hypochlorite introduced exogenous calcium， which was further converted into poorly soluble calcium salts and deposited in the pulp， causing the calcium content increased significantly to 29.27 g/kg. In a pulping system producing 1 ton of Pteroceltis tatarinowii bark pulp， calcium hypochlorite was the largest calcium input source， contributing 34.36 kg/t (59.1%). Although most of the calcium (49.20 kg/t) was lost in pulping effluents， 8.98 kg/t remained in the final Pteroceltis tatarinowii bark pulp. |
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