Surface evolution of aluminosilicate glass fibers during dissolution: Influence of pH, solid-to-solution ratio and organic treatment.

Autor: Okhrimenko DV; ROCKWOOL International A/S, Hovedgaden 584, 2640 Hedehusene, Denmark. Electronic address: denis.okhrimenko@rockwool.com., Barly SHQ; ROCKWOOL International A/S, Hovedgaden 584, 2640 Hedehusene, Denmark; Department of Chemistry and Bioscience, Aalborg University, Aalborg 9220, Denmark., Jensen M; ROCKWOOL International A/S, Hovedgaden 584, 2640 Hedehusene, Denmark; Department of Chemistry and Bioscience, Aalborg University, Aalborg 9220, Denmark., Lakshtanov LZ; Institute of Experimental Mineralogy RAS, Chernogolovka 142432, Russia., Johansson DB; ROCKWOOL International A/S, Hovedgaden 584, 2640 Hedehusene, Denmark., Solvang M; ROCKWOOL International A/S, Hovedgaden 584, 2640 Hedehusene, Denmark., Yue YZ; Department of Chemistry and Bioscience, Aalborg University, Aalborg 9220, Denmark., Stipp SLS; Department of Physics, Technical University of Denmark, Kongens Lyngby 2800, Denmark.
Jazyk: angličtina
Zdroj: Journal of colloid and interface science [J Colloid Interface Sci] 2022 Jan 15; Vol. 606 (Pt 2), pp. 1983-1997. Date of Electronic Publication: 2021 Sep 27.
DOI: 10.1016/j.jcis.2021.09.148
Abstrakt: Materials made of synthetic vitreous mineral fibers, such as stone wool, are widely used in construction, in functional composites and as thermal and acoustic insulation. Chemical stability is an important parameter in assessing long term durability of the products. Stability is determined by fiber resistivity to dissolution, where the controlling parameters are solid surface area to solution volume ratio (S/V), pH and composition of the fibers and organic compounds used as binders. We investigated stone wool dissolution under flow through conditions, far from equilibrium, at pH range of 2 to 13, as well as under batch conditions, close to equilibrium, for up to 28 days, where S/V ranged from 100 to 10000 m -1 . The dissolution rate of stone wool shows minimum at pH 8.5 and increases significantly at pH < 4.5 and pH > 12. In close to equilibrium conditions, S/V defines the steady state concentration for the leached components. Decreased dissolution rate could result from evolution of a surface leached layer or the formation of secondary surface phases or both. We suggested three dissolution rate controlling mechanisms, which depend on pH. That is, dissolution is controlled by: a SiO 2 rich surface layer at pH < 4.5; by adsorption of an Al and Al-Si mixed surface layer at 5 < pH < 11 and by divalent cation adsorption and formation of secondary phases (silicates, hydroxides) at pH ∼ 13. The organic compounds, used to treat the stone wool fibers during manufacture, had no influence on their dissolution properties.
Competing Interests: Declaration of Competing Interest The authors declare the following financial interests/personal relationships which may be considered as potential competing interests: [ROCKWOOL International A/S is a stone wool manufacturer. D.V. Okhrimenko, D.B. Johansson and M. Solvang are employed by ROCKWOOL International A/S.]
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Databáze: MEDLINE
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