Effect of fly ash-based calcium silicate on physical properties of cardboard paper, TAPPI Journal July 2023

 


Application: This study aims to broaden the application of China’s fly ash in integrated utilization and to address the physical properties of cardboard paper. With the help of a domestic company using high aluminum fly ash resources in the central and western regions of Inner Mongolia, the FACS produced by fly ash pre-desilication-alkali lime sintering method to extract calcium silicate, a byproduct of alumina co-production technology, was used as paper filler. The effect of FACS filler on the physical properties of cardboard paper was primarily tested and evaluated.

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Author: Puqi Zhao; Peng Xu; Sheng Xu; and Yuting Du
Effect of fly ash-based calcium silicate on physical propert
ABSTRACT: This work reported the possibility of using fly ash-based calcium silicate (FACS) as filler for papermaking and waste fiber to synthesize cardboard paper. The adverse effects of FACS filler on paper strength were improved by using cationic starch modification, surface size, and interlayer-filled technology. Physical property tests indicated that the increase of filler content leads to a decrease in paper strength and an increase in bulk, but at the same content, the strength properties of paper modified by cationic starch were significantly improved, and the absorption resistance was lower. The paper had better absorption resistance than the original FACS paper after surface size. In addition, the absorption resistance and strength of the interlayer filling paper were better than the original FACS-filled paper, and the absorption resistance was the best. The results support the potential use of FACS as a low-cost filler for cardboard paper production.
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