Method for recovering molybdenum in waste catalyst

Abstract

The embodiment of the invention relates to a method for recovering molybdenum in a waste catalyst. The method comprises the steps of respectively grinding the waste catalyst and sodium carbonate, and stirring and mixing the ground waste catalyst and sodium carbonate; putting the mixed waste catalyst and sodium carbonate into a vacuum resistance furnace for roasting to obtain a roasted product, wherein the roasting temperature ranges from 140 DEG C to 200 DEG C; leaching the roasted product by using distilled water to obtain a mixture of leaching liquid and leaching residues; and separating the mixture of the leaching liquid and the leaching residues to obtain the leaching liquid. According to the method for recovering molybdenum in the waste catalyst, on one hand, the vacuum technology is used, the technological process is simple, the technological period is short, and therefore the technological energy consumption is reduced; on the other hand, additives in the technological process are relatively harmless, and the molybdenum recovery rate is high; and waste residue components obtained after molybdenum recovery is conducted on the waste catalyst are not obviously damaged, subsequent recovery of other ions is not influenced, secondary pollution is not caused, and the method is environmentally friendly.

Description

technical field [0001] The embodiments of the present invention relate to the technical field of environmental protection and resource recovery and comprehensive utilization, and in particular to a method for recovering molybdenum from spent catalysts. Background technique [0002] Petrochemical catalysts are commonly used in the petrochemical industry to remove sulfur from various organics present in different parts of petroleum. Most of these catalysts are composed of molybdenum, cobalt and nickel supported on alumina, mainly including molybdenum-cobalt-alumina system, molybdenum-nickel-alumina system, molybdenum-cobalt-nickel-alumina system catalyst. With continuous use for a long time, petrochemical catalysts are gradually polluted by impurities such as carbon, vanadium, oxygen, and sulfur in crude oil, and thus become ineffective. Deactivated catalysts are classified as hazardous solid wastes because they contain components that are harmful to the environment. Need to ...

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Problems solved by technology

[0004] Regarding the above-mentioned technical scheme, the inventors have found that there are at least the following technical problems: the process flow is too long, the environment is harsh, and the energy consumption is too large, resulting in waste of resources; the recovery rate of precious metals is low; due to the addition of a large amount of Additives make the treated waste slag more severely damaged than the spent catalyst before treatment, and cannot be reused and recycled, causing serious secondary pollution

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