Process for preparing sodium disilicate having a high ion-exchange capacity
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United States of America Patent
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Apr 20, 1999
Grant Date -
N/A
app pub date -
Sep 30, 1996
filing date -
Oct 12, 1995
priority date (Note) -
Expired
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Abstract
The invention relates to a process for preparing sodium disilicate in the .beta. form having a high ion-exchange capacity and a molar ratio Na.sub.2 O:SiO.sub.2 of about 1:2 from a silicate source and sodium hydroxide solution at elevated temperature, with the product formed being separated off by filtration, wherein the product is further heat treated at from 450.degree. to 780.degree. C. and/or is pressed to form compact parts.
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