Method for processing multi-metal alloy

Abstract

The invention discloses a method for processing a multi-metal alloy. The method comprises the following steps of firstly, carrying out oxygen-enriched pressure leaching on the multi-metal alloy containing nickel, cobalt, tungsten, molybdenum, vanadium, and iron in the sulfuric acid system to selectively leach nickel and cobalt in the multi-metal alloy; precipitating a leaching solution containing nickel and cobalt through an alkaline substance to obtain a nickel-cobalt residue product; pressurizing the leaching residue containing molybdenum, vanadium, tungsten and iron, adding a small amount of ammonium persulfate, leaching with sodium hydroxide and after the leaching is completed, carrying out solid-liquid separation to obtain a leaching solution containing tungsten, molybdenum and vanadium; adjusting the pH of the leaching solution containing tungsten, molybdenum and vanadium with hydrochloric acid, adding a vanadium-precipitating agent so that vanadium is precipitated in a form of ammonium vanadate and firing ammonium vanadate to obtain a vanadium pentoxide product; and adsorbing tungsten and molybdenum in the vanadium-precipitated solution with anion resin and backwashing to obtain a high-concentration ammonium tungstate and ammonium molybdate solution, evaporating and crystallizing to obtain a mixed product of ammonium tungstate and ammonium molybdate. The processing method is simple in flow, the required device is less and simple, the device investment is low and simple in operation and the method is easy to promote.

Description

technical field [0001] The invention relates to the technical field of metallurgy and chemical industry, in particular to a processing method for multi-metal alloys. Background technique [0002] At present, the use of catalysts has played a huge role in the rapid development of the petroleum industry and the 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. 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 invalid, so it cannot be used any longer, and it has to be replaced with a new catalyst, thus producing a large amount of spent catalyst. Spent catalysts contain a large amount of noble metals (such as Pt, Pd, and Ru, etc.), non-ferrous metals (such as W, Mo, Ni, Co, and V, etc.), and r...

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Problems solved by technology

[0003] In the prior art, the waste catalyst can recover valuable metals through the direct pyromelting process. This process has the advantages of good heat energy utilization, low reagent consumption, good comprehensive recovery and utilization of valuable metals, and small waste residue output. It is a kind of environmentally friendly Friendly new process, pyro-smelting has a high capture rate of precious metals, so it is also suitable for the treatment of waste catalysts containing precious metals. There is a lack of processing methods for this type of complex metal alloys in the technical proposal

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