Method of producing ranadium pentoxide using vanadium containing waste catalyst

Abstract

A process for preparing V2O5 from the used catalyst containing V includes such steps as removing deposited oil from said catalyst, pulverizing, immersing in water, oxidizing, adding alkali to regulate pH=8.5-9.5, extracting at 50-60 deg.C for 1-2 hr, solid-liquid separation, recovering the solution of sodium vanadate and sodium molybdate, washing filtered dregs, calcining in rotary furnace, dissolving the calcined material in water, stirring, solid-liquid separation, recovering the solution of sodium vanadate and sodium molybdate, collecting said solution, removing impurity P, adding ammonium chloride to generate ammonium metavanadate deposit, solid-liquid separation, adding ammonium metavanadate in flake-making furnace, decomposing at 800-850 deg.C to obtain fused V2O5, and preparing V2O5 flakes.

Description

technical field [0001] The invention belongs to the technical field of recovery of heavy metals, in particular to a method for producing vanadium pentoxide by using spent vanadium-containing catalysts. Background technique [0002] As we all know, catalysts (catalysts) are widely used in petroleum, chemical and other fields, and are indispensable substances for improving reaction speed and product yield. After being used for a period of time, due to poisoning and other reasons, the catalyst will gradually lose its catalytic effect and be scrapped and become waste. These spent catalysts contain various metals in different proportions, such as platinum, palladium, ruthenium, nickel, cobalt, vanadium, molybdenum, copper, aluminum, zinc, etc., and the most important use of vanadium in the chemical industry is as Catalysts, such as heavy oil dehydrogenation, desulfurization, production of sulfuric acid by contact method, synthesis of special rubber, and synthesis of several orga...

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Problems solved by technology

Due to corrosion, pipe burst, etc., production is often stopped, and each stop is at least 3 days. Although it has been repaired many times, the effect is not ideal, and it can only be removed in the end.

[0007] Due to the high temperature at the end of the kiln, the damage of the ash box room is serious, and many walls are broken, and the production must be stopped for maintenance 2-3 times a year. The capital investment is very large, and the loss of production shutdown is even greater.

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