Chemical reactions between aluminum dross with deionized water, various basic and acid solutions were investigated. The dross were evolved from the aluminum scraps that were recovered individually from each kind of aluminum alloy. Aluminum dross were composed of aluminum, Al₂O₃, AlN, and other oxides. The NH₃ gas evolved owing to hydrolysis of AlN, resulting in the increment of pH of the solutions. 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 1st stage was due to the hydrolysis of MgO that was included in dross and the 2nd 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 was quickly hydrolyzed in NaOH solution at high temperature.