Hydrothermal Dissolution of Low‐Quartz in Sodium Hydroxide Lyes: Kinetics and Equilibrium

Quartz flours were dissolved at temperatures between 100 and 220 °C for up to 7 d in NaOH lyes. The starting materials were characterized by particle size analysis. Liquid and solid reaction products were characterized chemically and structurally. Sodium water glasses with silica concentrations of u...

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Bibliographic Details
Published in:Chemie ingenieur technik 2019-01, Vol.91 (1-2), p.92-101
Main Authors: Pfeiffer, Thomas, Sander, Stephan A. H., Enke, Dirk, Roggendorf, Hans
Format: Article
Language:English
Subjects:
Hydrothermal dissolution
Kinetics
Quartz
Sodium water glass
Solubility
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Summary:Quartz flours were dissolved at temperatures between 100 and 220 °C for up to 7 d in NaOH lyes. The starting materials were characterized by particle size analysis. Liquid and solid reaction products were characterized chemically and structurally. Sodium water glasses with silica concentrations of up to 20 wt % were obtained. Radius reduction of size distributed particle ensembles was calculated to evaluate the concentration control of the dissolution rate which is due to saturation effects. An equilibrium between low‐quartz and the resulting water glass explains the obtained results. Sodium water glass was prepared by hydrothermal dissolution of quartz in NaOH. Surface reduction due to particle dissolution was calculated for data evaluation. The concentration control of the dissolution rate is due to saturation effects described by the Noyce‐Whitney law. An equilibrium between low‐quartz and the resulting sodium water glass explains the results.
ISSN:0009-286X
1522-2640
DOI:10.1002/cite.201800092