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Hydrothermal Dissolution of Reactive Silica Materials in Sodium Hydroxide Lyes
Reactive silica materials like vitreous silica or cristobalite were dissolved at temperatures between 100 and 220 °C for up to 7 days in NaOH lyes. The liquid and solid reaction products were analyzed chemically. Sodium water glasses with silica concentrations of up to 27 wt % and molar SiO2/Na2O ratios of up to 3.7 were obtained. The experimental data were evaluated by an approximation algorithm. The initial size reduction rates ranged between 0.1 and 7 µm h−1, depending on the temperature and the choice of starting materials. Correlations between thermodynamics and kinetics were discussed.
Hydrothermal Dissolution of Reactive Silica Materials in Sodium Hydroxide Lyes
Reactive silica materials like vitreous silica or cristobalite were dissolved at temperatures between 100 and 220 °C for up to 7 days in NaOH lyes. The liquid and solid reaction products were analyzed chemically. Sodium water glasses with silica concentrations of up to 27 wt % and molar SiO2/Na2O ratios of up to 3.7 were obtained. The experimental data were evaluated by an approximation algorithm. The initial size reduction rates ranged between 0.1 and 7 µm h−1, depending on the temperature and the choice of starting materials. Correlations between thermodynamics and kinetics were discussed.
Hydrothermal Dissolution of Reactive Silica Materials in Sodium Hydroxide Lyes
Alyosef, Hallah Ahmad (author) / Lilli, Bettina (author) / Enke, Dirk (author) / Roggendorf, Hans (author)
Chemie Ingenieur Technik ; 97 ; 11-22
2025-02-01
12 pages
Article (Journal)
Electronic Resource
English
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