NICKEL RECOVERY FROM THE ALLOY AL_2 NI AND THE MIXTURES AL-NI, AL_2O_3-NI AND AL_2O_3-NIO. COMPARATIVE STUDY BY DIRECT CHLORINATION OF THE SPECIES

摘要

The separation of nickel from the aluminum present in spent catalysts and different metallic industrial residues, is proposed in the following systems: alloy Al_2Ni and the mixtures 50 wt%Ni + 50 wt% Al, 10 wt% Ni + 90 wt% Al_2O_3 and 12 wt% NiO + 88 wt% Al_2O_3. The experimentswere carried out in a tubular reactor with a flow of 21/h of gaseous chlorine and from 200° to800°C.The final products of the reaction, extracted from the hottest zones of the reactor where characterized by XRD, SEM, EDS, AA and XRF, as NiCl_ y NiCl_.6H_O while in the coldest regions AlCl_3 was deposited in the first two cases and in the other there was a residue of 6, a-Al_2O_3, sometimes mixed with some remainder of Ni and NiO.The procedure attained different separation factors which showed the optimun conditions for therecovery of both metals.