Comprehensive utilization system of spent catalyst

Abstract

The invention discloses a comprehensive utilization system of a spent catalyst. The comprehensive utilization system of the spent catalyst is characterized by comprising a deoiling furnace, a rotary kiln, a four-stage countercurrent device, a stirring tank I, a plate-and-frame filter I, a precipitation tank I, a plate-and-frame filter II, a stirring tank II, a centrifuge I, ion exchange resin, anextraction device, a back extraction device, a precipitation tank II, a centrifuge II and a washing tank. The comprehensive utilization system of the spent catalyst is low in process cost, green and environment-friendly, and capable of effectively recycling useful components in the residual oil hydrotreating spent catalyst to obtain industrial steam, nickel-aluminum powder, ammonium metavanadate,high-purity molybdic acid, anhydrous sodium sulfate, distilled water and the like, wherein the high-purity molybdic acid can be obtained without repeated separation processes, and the purity of the high-purity molybdic acid can reach 99. 9%.

Description

technical field [0001] The invention relates to a waste catalyst comprehensive utilization system. Background technique [0002] Spent catalysts are recognized environmental pollutants and must be converted into harmless substances before entering the environment. The waste catalyst for hydrogenation of residual oil contains rare metals such as molybdenum and vanadium, which have high economic value. However, because molybdenum and vanadium have many chemical commonalities, it is difficult to separate them. [0003] At present, the existing separation process includes: 1) using alkali-added roasting process, the auxiliary raw materials added are Na2CO3, NaOH, NaCl or Na2SO4, etc., the roasted product is leached with hot water, and the molybdenum and vanadium in the solution are in the form of soluble sodium salt into the solution, after which ammonium salt precipitation vanadium and molybdenum extraction are carried out; 2) use acid leaching or directly use acid to strengt...

AI Technical Summary

Problems solved by technology

However, the purity of molybdenum and vanadium obtained through the current separation process is not high, and high-purity molybdenum and vanadium must be obtained through multiple separation processes, which is expensive

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