Method for preparing vanadium trioxide through bone coal vanadium extracting vanadium-rich liquid

Abstract

The invention belongs to the field of nonferrous metallurgy, in particular to a method for preparing vanadium trioxide through bone coal vanadium extracting vanadium-rich liquid. The method includes the following steps of firstly, conducting pH adjustment on the bone coal vanadium extracting vanadium-rich liquid with vanadium concentration larger than 6 g / L by means of alkali liquor or acid liquor to obtain to-be-reduced liquid with hydrogen ion concentration of 10<-4>-10<-14> mol / L; secondly, conducting stirring reaction on hydrogen and the to-be-reduced liquid in a high-temperature high-pressure reaction device at temperature of 50-300 DEG C and hydrogen partial pressure larger than 1 MPa for 1 h or more to obtain vanadium trioxide water slurry; thirdly, conducting solid-liquid separation on the vanadium trioxide water slurry to obtain a vanadium trioxide filter cake and filtrate; fourthly, conducting vacuum drying on the vanadium trioxide filter cake to obtain vanadium trioxide. The method has the advantages of being simple in process, friendly to the environment and low in production cost.

Description

technical field [0001] The invention belongs to the field of non-ferrous metal metallurgy, and in particular relates to a method for preparing vanadium trioxide from a vanadium-enriched liquid extracted from stone coal. 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, ...

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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