Rheological properties and volumetric isothermal expansivity of bamboo kraft black liquor with high solids content and low lignin content

In this study, a certain percentage of lignin in original bamboo kraft black liquor (BKBL) was separated, and the residual BKBL with low lignin content was expected to be fed into the alkali recovery boiler to reduce the heat transfer load of the alkali recovery boiler. With the decrease in lignin c...

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Bibliographic Details
Published in:Scientific reports 2023-02, Vol.13 (1), p.2400-2400, Article 2400
Main Authors: Chen, Shenglin, Xu, Yongjian, Guo, Kangkang, Yue, Xiaopeng
Format: Article
Language:English
Subjects:
639/166
639/4077
639/638
639/766/189
Heat transfer
Humanities and Social Sciences
Lignin
multidisciplinary
Pulp wastes
Rheology
Science
Science (multidisciplinary)
Viscoelasticity
Viscosity
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Summary:In this study, a certain percentage of lignin in original bamboo kraft black liquor (BKBL) was separated, and the residual BKBL with low lignin content was expected to be fed into the alkali recovery boiler to reduce the heat transfer load of the alkali recovery boiler. With the decrease in lignin content, the rheological properties/volumetric isothermal expansivity (VIE) of BKBL change. When the lignin content was 70% remaining in the original BKBL, the viscosity of BKBL with low lignin content is close to that of the passivated BKBL at the same solids content, the dynamic viscoelasticity is superior, and the VIE decreases by 57.2%. When the amount of desilication agent is 1.5%, the viscosity of BKBL with low lignin content did not change much, and the VIE increased sharply and was 62.7% higher than that of the passivated BKBL. Therefore, the combination of partial lignin separation process and sodium aluminate desilication process can effectively improve the ability of alkali recovery boiler to deal with BKBL and reduce the influence of “silicon interference”.
ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-023-29350-0