PyritePyrite is an iron disulfide (FeS2) associated with base metal sulfides. During flotationFlotation and due to their hydrophobicHydrophobic properties, it occurs abundantly in the concentrate. In this research work, we seek to alter the surface properties of this species to hydrophilic ones by adding tannic acidTannic acid (TA), evaluating the collectorlessCollectorless flotationFlotation of a single phase of FeS2, using different pH values 6.0, 7.0, 9.0 and proportions of AT 50, 100, 200, 400, 600 and 800 mg/L. The results show that during flotationFlotation in the absence of AT, the pyritePyrite presents hydrophobicHydrophobic properties, obtaining a concentrate with around 35% w/w, the addition of AT and for all the concentrations evaluated depresses the FeS2, when there are 800 mg/L of AT in the pulp, the concentrate obtained contains 12.7% w/w, while with 50 mg/L of AT there is 15.8% w/w, the tests were carried out at oxidizing potentials of +350 mV.