Method for purifying aqueous compositions
AssigneeSolvay (Societe Anonyme)
InventorAlessandra Pastacaldi
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Abstract
Method for purifying an aqueous composition by removing silicon therefrom, according to which a compound comprising aluminum is added to the aqueous composition in order to obtain a molar aluminum content greater than the molar silicon content in said composition, the pH of the composition is controlled and maintained at a value higher than or equal to 8 and lower than or equal to 10, and the precipitate formed is separated from the aqueous suspension obtained.
Claims20
A method for purifying an aqueous composition by removing silicon therefrom, in which aqueous composition the molar silicon content is higher than the aluminum content, the method comprising the following steps:
- (1) a compound comprising aluminum is added, to the aqueous composition, in order to obtain a molar aluminum content greater than the molar silicon content in said aqueous composition;
- (2) the pH of the composition obtained at step (1) is controlled and maintained at a first value greater than or equal to 8 and lower than or equal to 10, in order to obtain a first precipitate;
- and
- (3) the first precipitate formed in the preceding step (2) is separated from the aqueous composition in order to obtain the purified aqueous composition.
Dependencies are inferred from the claim text.