Multi-element recycling of residual oil hydrogenation waste catalyst

Abstract

The invention relates to the technical field of waste catalyst recovery, and discloses multi-element recycling of a residual oil hydrogenation waste catalyst. A multi-element recycling method comprises the following steps of adding a certain proportion of sodium carbonate into the waste catalyst, carrying out high-temperature roasting in a rotary kiln, carrying out a sodium modification reaction, carrying out sodium modification on valuable metals such as vanadium and molybdenum into soluble salt, and recycling vanadium and molybdenum through a wet process after water leaching; after an alumina carrier is changed into the soluble salt, separating from a material, then controlling the pH value, and introducing carbon dioxide to prepare an aluminum hydroxide product; and after molybdenum and vanadium are extracted and aluminum oxide is removed, enriching nickel in the material, then recycling nickel from nickel-rich slag through a wet process, and finally obtaining nickel protoxide. The method solves the problem of large investment of traditional pyrogenic process dealumination, and the dealumination section does not need natural gas, so that the energy consumption is reduced, and the secondary hazardous waste amount is small; and the dealumination effect is good, the aluminum recovery rate exceeds 95%, and the aluminum content in the nickel-rich slag is less than 10%.

Description

technical field [0001] The invention relates to the technical field of recovery of spent catalysts, in particular to the multi-element recovery and utilization of spent catalysts for residual oil hydrogenation. Background technique [0002] HW50 waste catalysts (waste codes: 251~016~50, 251~017~50, 251~018~50, 251~019~50) produced in the manufacture of refined petroleum products contain vanadium, molybdenum, nickel, etc. Valence metal and alumina carrier, the recovery value is relatively high; [0003] At present, the key process of processing this material is the separation of alumina carrier in the second step. If the alumina is not removed to a certain content in the nickel-rich slag, it will directly affect the recovery of nickel, and this material continues to exist in the form of hazardous waste. , post-processing costs are high, the current separation process of this alumina is as follows: [0004] After extracting vanadium and molybdenum, the material, soda ash and...

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Problems solved by technology

[0008] NaAlO 2 Under alkaline conditions, the reaction temperature is controlled at 80°C and dissolved in water, and then carbon dioxide is introduced to precipitate alum

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