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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Main Authors | , , |
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Format | Patent |
Language | English French German |
Published |
25.10.2000
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Edition | 7 |
Subjects | |
Online Access | Get full text |
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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. |
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Bibliography: | Application Number: EP19900123277 |