PROCESS FOR EXTRACTING ALUMINIUM AND COPPER FROM SPENT CATALYSTS

摘要

The aluminum and copper extraction process of the spent catalysts according to the invention provides for grinding followed by alkaline leaching to solubilize aluminum in the form of sodium aluminate and to leach copper remaining in catalyst wastes with carboammonium solution containing 15 ... 160 g / l ammonium bicarbonate 112 ... 130 g / l NH3 and 10% CO2 at pH = 8.5 ... 9 under air bubbling, resulting in cuproammonium carbonate complex that decomposes at 90 ... 95 degree C under vacuum resulting in copper black oxide which is further treated at 400 DEG to 450 DEG C. under hydrogen atmosphere to obtain copper powder, and aluminum hydroxide precipitates from the sodium aluminate solution by bubbling carbon dioxide. In order to optimize the technological flow and recover the copper and aluminum with high yields, the initial attack of the spent catalysts being grinded, a solution of 15 ... 18% NaOH is introduced in an excess of 1.1 in relation to the required stoichiometric amount.