A kind of preparation method of vanadium trioxide

Abstract

The invention belongs to the field of nonferrous metal metallurgy and particularly relates to a preparation method of vanadium trioxide. The preparation method comprises the following steps that (1) purification and impurity removal are conducted on vanadium-enriched liquid with the vanadium concentration being larger than 6 g / L and used for extracting vanadium from stone coal, and purification liquid and sediment slag are obtained; (2) pH regulation is conducted on the purification liquid through alkali liquid or acid liquid, and to-be-reduced liquid with the hydrogen ion concentration being 10<-4>-10<-14> mol / L is obtained; (3) under the condition that the hydrogen partial pressure is larger than 1 MPa, hydrogen and the to-be-reduced liquid are subjected to a stirring reaction in a high-temperature high-pressure reaction device for over an hour at the temperature of 50-300 DEG C, and vanadium trioxide water slurry is obtained; (4) after the vanadium trioxide water slurry is subjected to solid-liquid separation, a vanadium trioxide filter cake and filter liquid are obtained; and (5) vacuum drying is conducted on the vanadium trioxide filter cake, and vanadium trioxide is obtained. The preparation method has the advantages of being simple in technique, environmentally friendly and low in production cost.

Description

technical field [0001] The invention belongs to the field of nonferrous metal metallurgy, in particular to a preparation method of vanadium trioxide. Background technique [0002] Vanadium trioxide is an important compound of vanadium, which has important applications in metallurgy, electronics, chemical industry and other industries. Vanadium trioxide can be used to produce ferrovanadium and metal vanadium powder, and can also be used as a raw material for producing vanadium carbide and vanadium nitride; due to its excellent optical, electrical and magnetic properties, vanadium trioxide Switches and gas sensors, storage materials, resistance materials and other fields have broad application prospects. [0003] At present, there are two main methods for preparing vanadium trioxide: one is ammonium metavanadate or ammonium polyvanadate thermal decomposition cracking method without adding a reducing agent, such as Chinese patent 200610020405.7, which releases when the ammoniu...

AI Technical Summary

Problems solved by technology

The disadvantages of this method are: the reduction temperature is above 900°C, and the energy consumption is relatively high; Chinese patent CN200610020405.7 discloses a method for producing powdered vanadium trioxide

The disadvantages of this technical solution are: high reduction temperature, high energy consumption, large amount of industrial gas consumption, complex production process

It can be seen that the current preparation process of vanadium trioxide is relatively complicated, and the complicated preparation process also causes an increase in production cost

Simultaneously, a large amount of ammonia nitrogen waste water can be produced in the process of preparing ammonium metavanadate and ammonium polyvanadate by ammonium salt precipitation, and the process of thermally decomposing ammonium metavanadate and ammonium polyvanadate to prepare vanadium pentoxide will release a large amount of Ammonia, these waste water and waste gas all can cause serious pollution to environment; In addition, use ammonium metavanadate or ammonium polyvanadate as raw material, can decompose a large amount of ammonia in the process of preparing vanadium trioxide, unreacted The release of ammonia gas into the atmosphere will also pollute the environment

Therefore, there is serious problem of environmental pollution in existing vanadium trioxide preparation technology

[0006] In summary, the existing vanadium trioxide preparation process has the disadvantages of complex process, serious environmental pollution and high production cost

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