Chemistry of inorganic compounds – Silicon or compound thereof – Oxygen containing
Reexamination Certificate
2009-10-28
2011-11-15
Michener, Jennifer K. (Department: 1728)
Chemistry of inorganic compounds
Silicon or compound thereof
Oxygen containing
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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El Dekki Hassan Moenes
Gopalkrishnan Chathangat Cheroolil
Trabzuni Fadi Mohammed Saeed
Chan Heng
Kilyk & Bowersox P.L.L.C.
Michener Jennifer K.
The National Titanium Dioxide Co., Ltd. (CRISTAL)
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