Precipitate flotation process is another alternative of flotation method, based on the formation of precipitate and subsequent removal by attachment to air bubbles. Depending on the concentration of the metal solution, the precipitation may proceed via metal hydroxide formation or as a salt with a specific anion (sulfide, carbonate, etc.) (Capponi et al., 2006). The removal of Cr(III) by precipitate flotation from dilute aqueous solutions, using SDS as anionic collector and ethanol as frother was investigated at laboratory scale (Medina et al., 2005). The results showed that a 96.2% maximum removal was achieved at pH around 8.0.