To provide a new, useful and easily handling apparatus with simple structure, and efficiently separating metal aluminum and recovering it.

Aluminum-containing matter A is charged between a pair of rolls 25, 25 of a roller crusher 13 to physically separate into flat metal aluminum M and powder I, which are screened to recover metal aluminum M as oversize. Preferably, aluminum dross A is sorted by a screening classifier 11 for pre-sorting before charging to the roller crusher 13, and respective sorted particles are charge to the roller crusher 13 in which a distance (d) between the rolls is adjusted corresponding to the size of the sorted particles.