| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a method for producing an aluminum salt aqueous solution useful as a coagulant simply, efficiently and continuously. Ž<P>SOLUTION: An acidic aluminum salt aqueous solution is produced in such a way that a sodium aluminate aqueous solution having a composition denoted as nNa<SB>2</SB>O-Al<SB>2</SB>O<SB>3</SB>(n=0.5-3) and an inorganic acid having a valence of m (wherein, m is an integer of 1 or more) such as nitric acid and the like are reacted by an impinging and mixing reaction at 5 m/s or more using a Y shape tube reactor and the like. In this case, the sodium aluminate aqueous solution and the inorganic acid are used so that the used amount α (mole) of the inorganic acid per 1 mole of Al<SB>2</SB>O<SB>3</SB>satisfies a condition expressed by the formula denoted as 0.95×(6+2n)/m≤α≤1.5×(6+2n)/m (wherein, n and m are the above numbers). Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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