Research on the brightening effect of miscible wetting additives on fly ash coatings
Nordic Pulp and Paper Research Journal, ISSN: 2000-0669, Vol: 39, Issue: 2, Page: 229-239
2024
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Article Description
The resource utilization of fly ash has always been a popular topic in the field of solid waste recycling. This paper is based on the three-phase reaction system of "fly ash (s)-[Ca(OH)2-H2O/ethanol] (l)-CO2 (g)", using the bubble carbonization method to carry out heterogeneous phase reaction with fly ash as the core crystallized to form a fly ash-based calcium carbonate composite with higher brightness. The composite material is used in the filling of paper instead of calcium carbonate filler. Based on the previous research of our team, we focused on exploring the addition of miscible wettability additives (ethanol and acetone) to improve the wettability of the reaction system, thereby improving the whitening and modification effect of fly ash. The results showed that the addition of ethanol and acetone can significantly improve the coating effect of fly ash, however, acetone is slightly toxic, more volatile, and expensive than ethanol, so ethanol is more suitable as a wetting agent to be added to the reaction system. Under the optimal coating conditions, when the ratio of ethanol and water is 1:1, the brightness of fly ash can reach 71.62 »% ISO, which is 17.29 »% ISO higher than that without ethanol.
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