Method for preparation of crystalline sodium silicates

In order to prepare crystalline sodium silicates having a layered structure of the formula Na2SixO2x + 1, in which x is between 2 and 3, first sand and sodium carbonate are melted in an SiO2/Na2O molar ratio of 2 to 3.5 at temperatures of 1200 to 1400 DEG C. The sodium silicate pieces formed on cool...

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Bibliographic Details
Main Authors KOTZIAN, MICHAEL, SCHIMMEL, GUENTHER, GRADL, REINHARD
Format Patent
LanguageEnglish
French
German
Published 25.10.2000
Edition7
Subjects
CHEMISTRY
COMPOUNDS THEREOF
INORGANIC CHEMISTRY
METALLURGY
NON-METALLIC ELEMENTS
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Summary:In order to prepare crystalline sodium silicates having a layered structure of the formula Na2SixO2x + 1, in which x is between 2 and 3, first sand and sodium carbonate are melted in an SiO2/Na2O molar ratio of 2 to 3.5 at temperatures of 1200 to 1400 DEG C. The sodium silicate pieces formed on cooling of the melt are ground to particle sizes of less than 2 mm before being treated in an elongate reaction zone at temperatures of 600 to 800 DEG C for 10 to 120 minutes with mechanical recirculation. Finally, the material leaving the reaction zone is ground to a particle fineness of less than 1 mm.
Bibliography:Application Number: EP19900123277