Efficient recovery of aluminum from saline slag wastes

This work presents the procedure to improve the aluminum extracted from a hazardous waste from the recycling of aluminum, aluminum that could be used in the production of value-added materials, as well as with the generation of non-hazardous waste. The aluminum waste was treated under reflux and stirring with NaOH aqueous solutions taking into account two concentrations (1 and 2 mol/dm(3)), various times of extraction (1, 2 and 4 h) and 4th consecutive steps of extraction in order to obtain solutions with Al3+. The activation of the waste by milling is also analyzed. After extraction, the solution is filtered to separate an aqueous solution that contain the extracted Al3+ and a residual waste. A maximum of 7.54 g/dm(3) of aluminum was extracted in the first step, for a total accumulated of 9.59 g/dm(3) of aluminum. The 'extracted aluminum can be used to synthesize added-value Products applied as adsorbents and catalysts. Finally, the residual waste generated was characterized by N-2 adsorption at -196 degrees C, X-ray diffraction, X-ray fluorescence, energy-dispersive X-ray and scanning electron microscopy in order to apply it as in future works adsorbent or catalyst.