Method for separating and recovering vanadium and molybdenum from waste hydrogenation catalyst

Abstract

The invention belongs to the technical field of resourceful treatment of hazardous wastes containing heavy metals, and particularly discloses a method for separating and recovering vanadium and molybdenum from a waste hydrogenation catalyst. The method comprises the following steps: putting the waste hydrodesulfurization catalyst into sublimation-two-stage desublimation equipment for roasting, and introducing water vapor flow, so that the waste hydrodesulfurization catalyst is obtained on the basis of the characteristics that vanadium pentoxide and molybdenum trioxide are easy to volatilize in a high-temperature environment and the saturated vapor pressures of the two substances are obviously different; molybdenum trioxide and vanadium pentoxide are separated from a carrier and volatilized to form molybdenum-vanadium steam under the high-temperature condition, gas phase separation of molybdenum-vanadium steam components is further carried out by adopting a method of decompressing and then desublimating step by step, vanadium pentoxide is desublimated and recycled firstly, then normal pressure is recovered, and molybdenum trioxide desublimation is achieved in a cooling mode. The purpose of separating and recovering vanadium pentoxide and molybdenum trioxide products from the waste hydrogenation catalyst is achieved. The method is simple to operate, efficient and free of wastewater generation, and has obvious practical application value.

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