Leaching Reactions of Aluminum Dross in Various Aqueous Solutions

Leaching Reactions of Aluminum Dross in Various Aqueous Solutions

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Leaching Reactions of Aluminum Dross in Various Aqueous Solutions, by Shinji Fukumoto, Tomoko Ho”okabe, and Harushige Tsubakino, Keikinzoku (Journal of the Japan Institute of Light Metals) Vol. 51, No. 1, 34-39 (2001). English translation from the Japanese.

Chemical reactions between aluminum dross with deionized water, various basic and acid solutions were investigated. The dross were evolved from aluminum scraps that were recovered individually from each kind of aluminum alloy. Aluminum dross were composed of aluminum, Al2O3, AlN, and other oxides. The change behavior in pH of the water with AlN was quite different from that with aluminum dross. The pH of AlN powder solution increased by one step; on the other hand, that of the dross solution increased by two steps. The pH increment in the first stage was due to the hydrolysis of MgO that was included in the dross, and the second stage was due to the hydrolysis of AlN. The hydrolysis of AlN included in dross was promoted in the basic and acid solutions. In particular, AlN included in dross quickly hydrolyzed in NaOH solution at high temperature.

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