Process for hydrothermal production of sodium silicate...

Chemistry of inorganic compounds – Silicon or compound thereof – Oxygen containing

Reexamination Certificate

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C423S332000, C423S324000, C423S325000, C423S326000

Reexamination Certificate

active

08057770

ABSTRACT:
A method is provided for treating silica sand scrubs (SSS) generated and accumulated as waste in the chloride manufacturing process of titanium dioxide pigment. A hydrothermal process is used to produce sodium silicate solutions of modulus 3.0 to 3.8, and precipitated silicas. In some embodiments, the process uses two specific principal reaction stages. A sodium silicate solution having a low SiO2:Na2O molar ratio, in the range from 2.0 to 2.8, is first produced by reaction of the SSS, as a cost-effective SiO2source, with aqueous caustic soda. The conversion of this intermediate sodium silicate solution of low modulus to a high SiO2:Na2O molar ratio is made possible by using a SiO2source that is prepared as precipitated amorphous silica from the intermediate sodium silicate solution produced above.

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patent: 2004-269311 (2004-09-01), None

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