| 摘要 |
Sodium silicate solutions are prepared by dissolving sand in sodium hydroxide solution at a pressure of at least 100 psig and at a temperature of at least 130 DEG C. to produce a sodium silicate solution having a silica to sodium oxide molar ratio of between 2.4:1 and 2.8:1, and activating said sodium silicate solution by reaction with from about 50 to 200 ppm of alumina.
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