Patent ID: 7622097
Filing Date: 2009-11-24
Classification: C01B

Abstract:
1. A method for hydrothermal production of an aqueous sodium silicate solution having a SiO 2 :Na 2 O molar ratio of at least 3.0:1, said method comprising the steps of: (i) manufacturing titanium dioxide, wherein the manufacturing comprises generating a waste product, the waste product comprising a precursor solid silica source; (ii) collecting the waste product; (iii) exfoliating and removing titanium dioxide particles adhering to the surface of the precursor solid silica source of the collected waste product, to form cleaned silica; (iv) producing an intermediate sodium silicate solution by a hydrothermal fusion reaction of the cleaned silica with a caustic soda in an autoclave; (v) forming an amorphous silica source by transposing the SiO (vi) dissolving the amorphous silica provided in step (v) in the intermediate sodium silicate solution of step (iv) and raising the SiO