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Abstract
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”.
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Details
1 Shaanxi University of Science and Technology, College of Bioresources Chemical and Materials Engineering, Xi’an, China (GRID:grid.454711.2) (ISNI:0000 0001 1942 5509); Shaanxi University of Science and Technology, National Demonstration Center for Experimental Light Chemistry Engineering Education, Xi’an, China (GRID:grid.454711.2) (ISNI:0000 0001 1942 5509); Shaanxi University of Science and Technology, Key Laboratory of Paper Based Functional Materials, China National Light Industry, Xi’an, China (GRID:grid.454711.2) (ISNI:0000 0001 1942 5509); Shaanxi University of Science and Technology, Shaanxi Key Laboratory On Paper Technology and Specialty Papers, Xi’an, China (GRID:grid.454711.2) (ISNI:0000 0001 1942 5509)