Scandium is a rare earth element, used mainly in special aluminum alloys, SOFC's and metal halide lamps production. Despite of being the 31st element more abundant in Earth’s Crust, it is rarely found concentrated in ores, and its production is always related to other minerals processing as a by-product or scrap recovering. The equilibrium extraction of Scandium from a nickel processing waste with Cyanex 923 in sulphuric media was studied. Cyanex 923, a mixture of alkyl-phosphine oxides, presents a better selectivity to Sc in comparison to the other metals components of the residue, Fe, Cu, Ni and Co. The mechanism of extraction is solvation, and increasing the acidity of aqueous solution Sc extraction was also increased. Extractant concentration were varied in order to obtain equilibrium stoichiometric relation. Experiments varying temperature were held, as a result was observed that the extraction process is exothermic and more favorable in room temperature.