Development of an Environmentally Friendly Process for Separation and Recovery of Rare Metals from Spent Oil-Desulfurization Catalyst

概要

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When V and Ni in crude oil are adsorbed on the surface of a desulfurization catalyst composed of MoS2, Co and Ni supported on Al2O3, the catalyst loses its catalytic activity. To recover Mo and V from the spent catalyst, soda roasting at high temperature and alkali leaching are applied industrially, but Ni and Co cannot be recovered by this process. The present study aimed to develop an environmentally friendly process to separate and recover all of these rare metals from the spent oil desulfurization catalyst at low temperature. Through a process consisting of leaching of the spent catalyst with the dilute sulfuric acid and hydrochloric acid, followed by separation with solvent extraction and crystallization-stripping, the rare metals were recovered as CaMoO4, NH4VO3, NiC2O4 and CoC2O4.