Aqueous phosphate-stabilized polyaluminum sulfate solutions and preparation thereof
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United States of America Patent
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Aug 18, 1981
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Jul 25, 1979
filing date -
Jul 25, 1979
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Abstract
A physically and functionally stable solution for water treatment comprises an about 1.2-2.7 molar aqueous phosphate-stabilized polyaluminum sulfate solution of a composition having the formula Al(OH).sub.x (SO.sub.4).sub.y (H.sub.2 PO.sub.4).sub.z wherein x is about 1.2 to 1.62; y is about 0.595 to 0.87; and z is about 0.06 to 0.19 with the proviso that the sum of x+2y+z is 3. The aqueous phosphate-stabilized polyaluminum sulfate solution can be prepared by reacting alumina hydrate with phosphoric acid and contacting the reacted alumina hydrate with an aqueous polyaluminum sulfate solution. Alternatively, the aqueous phosphate-stabilized polyaluminum sulfate solution can be prepared by reacting an aqueous overbasified polyaluminum sulfate phosphate solution with an aqueous aluminum sulfate solution.
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