Method for extracting valuable metal from waste hydrogenation catalyst

Abstract

The invention provides a method for extracting valuable metal from a waste hydrogenation catalyst. In the method, molybdenum is recovered in the form of calcium molybdate, thus the technical problem such as difficult treatment of a large quantity of acid liquor during the process of precipitating molybdenum by using acid is solved, and meanwhile the problem of severe production environmental pollution caused by ammonia water used in the generation process of ammonium molybdate can be avoided. The method comprises the following steps: roasting the waste catalyst at high temperature so as to burn out organic matters, sulfur and carbon; leaching the desulfurized and decarburized catalyst; converting Mo, V and a small amount of Al in the catalyst into water-soluble substances, and respectively processing other metallic oxides which are still remained in solid slags; for the water-soluble part, controlling the temperature and adjusting the PH value so as to remove foreign ions such as AlO2<->, SiO3<2-> and the like in a solution; and for the solid slag part, refining a nickel sulfide precipitate so as to convert the nickel sulfide precipitate into nickel sulfate, cooling and crystallizing to finally obtain nickel sulfate crystal.

Description

technical field [0001] The invention relates to a catalyst recovery process, in particular to a method for extracting useful metals from hydrogenation waste catalysts, which can effectively recover aluminum metal, molybdenum metal and nickel metal in the hydrogenation catalyst. Background technique [0002] The advancement of modern science and technology, and the human demand for high-tech materials are inseparable from the development of the petroleum and chemical industries. Among them, the use of catalyst has played a huge role in the rapid development of petroleum industry and chemical industry. According to statistics, the annual consumption of catalysts in the world is about 800,000 tons, including about 415,000 tons of refining catalysts and 335,000 tons of chemical catalysts. [0003] However, with the prolongation of the use time of the catalyst, due to the change of its own components and structure, the activity of the catalyst will eventually decrease or become ...

AI Technical Summary

Problems solved by technology

[0033] The purpose of the present invention is to provide a method for extracting useful metals from spent hydrogenation catalysts, which reclaims molybdenum in the form of calcium molybdate, which solves the technical problem that a large amount of acid solution is difficult to handle due to acid precipitation of molybdenum, and also avoids In order to generate ammonium molybdate, ammonia water is used, which has serious pollution to the production environment

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