Method for recovering acid solution and separating vanadium in the process of reducing acid leaching vanadium-containing waste catalyst

Abstract

The invention relates to a method for recovering acid solution and separating vanadium in the process of reductive acid leaching waste catalyst containing vanadium. The method comprises the following steps: (1) acid leaching waste catalyst containing vanadium with organic acid to obtain organic acid leaching solution , separate the organic acid to obtain the enriched solution; (2) oxidize the enriched solution, remove the iron element in the oxidized enriched solution to obtain a purified solution, and then subject the purified solution to vanadium element The precipitation process obtains the recovery product, and the recovery product is a vanadium compound. The present invention first recovers the organic acid, and the recovery rate reaches 80-90%, and then oxidizes the enriched solution, and the Fe in the enriched solution is oxidized during the oxidation process. 2+ and V 4+ Oxidized to Fe 3+ and V 5+ , and then remove the iron element. The removal process of the iron element will not cause the loss of the vanadium element, which is conducive to improving the recovery rate of the vanadium compound.

Description

Technical field[0001]The present invention belongs to the field of non-ferrous metallurgy and resource recovery, and more particularly to a method of recovering the acid recovery and separating vanadium in the catalyst of lycovate, and more particularly to a reductive acid immersed. And methods of separating vanadium and tungsten.Background technique[0002]Vanadium is an important beneficial metallic element, known as the "modern industry MSG", is an important strategic resource in the country, widely used in steel, non-ferrous metals and chemical chemical and other industries, such as vanadium-containing steel in the steel industry, with intensity High, toughness and wear resistance, and is widely used in machinery, automobiles, shipbuilding and railways and other industries; in the chemical industry and petroleum industry, it is widely used as catalysts, such as sulfuric acid industry, petroleum industry, flue gas denitration, synthesis Polyethylene and the like anhydride, etc.[000...

AI Technical Summary

Problems solved by technology

The acid system involved in the reductive acid leaching process is generally an inorganic sulfuric acid system. Because sulfuric acid itself does not have reducing properties, it is necessary to add reducing agents such as sodium sulfite, sulfur dioxide, etc., as reported in CN103290223A, but the method has low leaching rate and additional reduction The shortcoming that other impurity ions such as sodium, sulfur etc. are not easy to remove is introduced by agent; Do not add reductant in direct acid leaching process, directly use acid solution leaching, as reported in CN103966447A, pre-leaching with dilute sulfuric acid, after leaching again with concentrated sulfuric acid However, the vanadium leaching rate only reaches 85% in the two leaching processes; the alkali leaching process adds sodium hydroxide leaching under normal pressure or high pressure to form sodium vanadate leaching solution, but the product purity obtained by the method is lower , as reported by CN103484678A, CN1305537A, CN1927726A, CN101631598A, CN102936039A, etc.

[0005] The vanadium-containing leaching solution in the patent CN106244828A is obtained by adding potassium sulfate to crystallize to obtain potassium alum to remove aluminum. After the crystallization, the solution is reduced by adding reduced iron powder or sodium sulfite and other substances to reduce the iron in the solution. Add oxalic acid to realize the removal of iron impurities in the form of oxalate. After removing impurities, the removal rate of aluminum reaches 70-85%, and the removal rate of iron is 80-95%, but the waste acid solution produced in the preparation process is serious to environmental pollution; The process of preparing vanadyl sulfate from an acidic vanadium-containing solution, but it produces more waste during the preparation process and causes serious environmental pollution

[0006] Therefore, this area needs to develop a kind of method of novel reclaiming vanadium, makes recovery process simple, low energy consumption, can industrialized production, and can solve the serious pollution that exists in the prior art, leaching rate is lower, product purity is lower and impurity ion Difficult to control, unusable waste acid, etc.

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