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Title: Hydrothermal dissolution of technical grade vitreous silica in NaOH solutions to liquid water glasses with higher SiO2:Na2O ratios
Author(s): Pfeiffer, Thomas
Enke, Dirk
Roggendorf, Hans
Issue Date: 2021
Type: Article
Language: English
Abstract: Technical grade vitreous silica was dissolved hydrothermally in NaOH lyes. Liquid sodium water glasses with silica concentrations of up to 26.4 wt % and molar SiO2:Na2O ratios of up to 3.5 were obtained. The dissolution behavior showed two temperature regimes: up to 130 °C the SiO2 content approached a final solubility limit controlled by cristobalite crystallization. Above 130 °C, crystallization of low quartz restricted solubility. The dissolution kinetics were governed by surface area reduction and saturation control according to the Noyce-Whitney law.
Open Access: Open access publication
License: (CC BY-NC-ND 4.0) Creative Commons Attribution NonCommercial NoDerivatives 4.0(CC BY-NC-ND 4.0) Creative Commons Attribution NonCommercial NoDerivatives 4.0
Sponsor/Funder: Publikationsfonds MLU
Journal Title: Chemie - Ingenieur - Technik
Publisher: Wiley-VCH Verl.
Publisher Place: Weinheim
Volume: 93
Issue: 3
Original Publication: 10.1002/cite.202000107
Page Start: 473
Page End: 481
Appears in Collections:Open Access Publikationen der MLU

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