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Dissolution of sodium silicate glasses for the production of water glass – Part I: Study of experimental parameters

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The influence of experimental parameters on the dissolution of sodium silicate glasses with SiO2:Na2O ratios of 2·0 and 3·3 has been investigated in order to establish reliable corrosion conditions. Two principal experimental setups were tested; static (without exchange of leachant) and dynamic (with leachants continuously flowing through). Deionized water and 0·1 M NaOH were used as initial leachants. Surface pretreatment, temperature and time of corrosion, flow rate, surface area to solution volume ratio were varied and optimized. Balancing of glass samples and chemical analysis of leachates were used to describe the dissolution kinetics. Etching with HF was proven to be a reliable surface pretreatment. The chosen optimized corrosion conditions were temperatures of 30 and 50°C, flow rates of 2 l/d, and surface area to solution ratios of 10 m–1.
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Document Type: Research Article

Publication date: October 1, 2018

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