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PROCESS FOR THE HOT PREPARATION OF AQUEOUS SODIUM SILICATE SOLUTION WITH HIGH HIGH SOIL PROPORTION / INDEX 2: NA / INDEX 2 O
PROCESS FOR THE HOT PREPARATION OF AQUEOUS SODIUM SILICATE SOLUTION WITH HIGH HIGH SOIL PROPORTION / INDEX 2: NA / INDEX 2 O
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机译:高土壤比例/指数2:NA /指数2 O的水热制备硅酸钠水溶液的方法
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摘要
In a hydrothermal process for preparing sodium silicate solutions with a high SiO2:Na2O molar ratio, a crystalline silicon dioxide is reacted with an aqueous solution of sodium hydroxide. The process is characterized in that the crystalline silicon dioxide used is a quartz tempered at temperatures from 1100 DEG C up to its melting point, and that this tempered quartz is reacted with an aqueous solution of sodium hydroxide at a concentration between 10 and 50 wt.%, in a closed pressure reactor at temperatures between 150 and 300 DEG C and under saturated water vapour pressures corresponding to these temperatures.
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