Dissolution Studies of Glass Wool and Stone Wool at Alkaline pH †
Experimental studies were carried out at two different liquid to solid ratio (L/S) conditions: high L/S (1000) and low L/S (50) in an N2 glove box. High L/S conditions give information on the early stages of the dissolution whereas low L/S provides later stages of the process.
The ICP results show that under both L/S conditions glass wool releases increasing amount of Si, Al and B reaching 39–45 wt.%, 23–26 wt.% and 34–44 wt.% extent of dissolution with time respectively. However, in stone wool the release rate of Si and Al increases initially but becomes constant after certain time period. In both mineral wools, release rate of Ca and Mg varied with time. These changes in the release rate was observed to be due to precipitation of dissolved species. XRD results revealed that three crystalline phases-hydrotalcite, calcite, and calcium silicate were present on both glass and stone wool fibers after 25 days of dissolution. SEM results revealed that the morphology varies at different dissolution times and experimental conditions for both the mineral wools depicting the change in the reaction path. From these studies, we conclude that the dissolution rate and mechanism are controlled by both chemical composition of the fiber and the reacting solution conditions.
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Ramaswamy, R.; Yliniemi, J.; Luukkonen, T.; Vesavaara, I.; Illikainen, M. Dissolution Studies of Glass Wool and Stone Wool at Alkaline pH. Proceedings 2019, 34, 5. https://doi.org/10.3390/proceedings2019034005
Ramaswamy R, Yliniemi J, Luukkonen T, Vesavaara I, Illikainen M. Dissolution Studies of Glass Wool and Stone Wool at Alkaline pH. Proceedings. 2019; 34(1):5. https://doi.org/10.3390/proceedings2019034005Chicago/Turabian Style
Ramaswamy, Rajeswari, Juho Yliniemi, Tero Luukkonen, Ilkka Vesavaara, and Mirja Illikainen. 2019. "Dissolution Studies of Glass Wool and Stone Wool at Alkaline pH" Proceedings 34, no. 1: 5. https://doi.org/10.3390/proceedings2019034005