The characteristic features of heat-activated pore-formation of zeolite-containing rocks (ZR) and opoka in alkali compositions were examined. It was determined that the low-temperature pore-forming gas phase in the systems opoka + NaOH and ZR + NaOH is water vapor that formed during dehydration of hydrated sodium silicates. In the mix ZR + NaOH the second, higher-temperature source of water vapor was found to be hydrated silicate surfaces of amorphized post-zeolite components.
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Translated from Steklo i Keramika, No. 10, pp. 37 – 42, October, 2012.
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Kazantsev, L.K., Zheleznov, D.V., Seretkin, Y.V. et al. Formation of a pore-forming gas source by wetting natural aluminum-silicate with NaOH solution. Glass Ceram 69, 353–357 (2013). https://doi.org/10.1007/s10717-013-9478-9
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DOI: https://doi.org/10.1007/s10717-013-9478-9