Process for hydrothermal production of sodium silicate...

Details Process for hydrothermal production of sodium silicate... Process for hydrothermal production of sodium silicate...

C - Chemistry, Metallurgy

01

B

6/226

C01B 33/32 (2006.01)

Patent

CA 2009035

ABSTRACT OF THE DISCLOSURE The direct hydrothermal production of high purity sodium silicate solutions having a high SiO2 : Na2O molar ratio by reaction of a silicon dioxide source with aqueous sodium hydroxide solutions, or with aqueous sodium silicate solutions having a lower SiO2 : Na2O molar ratio, is made possible by using a silicon dioxide source that contains a sufficient fraction of cristobalite phase, or by condition- ing other crystalline forms of silicon dioxide by heating at or above 1100° C, but below the melting point of silica, before the hydrothermal treatment. Preferably the sodium hydroxide solution has a concentration range of 10 to 50% by weight, and the reaction is carried out in a closed pressure reactor at temperatures of 150 to 300°C and under saturated steam pressures corresponding to those tempera- tures.

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