The two-liquid flotation of fine oxide particles has been investigated using a chelating-type collector of oxine and the isooctane-water two-liquids system. The recovery was enhanced in a certain pH range. The oil-floatability during two-liquid flotation was concerned with the oxine adsorption on the solids. In addition, solution-chemical calculations indicated that the reactivity of the metal cation with oxine based upon a surface precipitation mode was closely related to the adsorbability of oxine and, hence, to the oil-floatability of the solids. Also, the possible conditions for collection by two-liquid flotation were experimentally determined and were related to the solution-chemical criterion.