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Method of preparing vanadium pentoxide by using vanadium-containing solution

A vanadium pentoxide and solution technology, applied in the metallurgical field, can solve the problems of complex process flow, low yield, unsatisfactory impurity removal and the like

Active Publication Date: 2017-08-18
广东省资源综合利用研究所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the unsatisfactory removal of impurities by the existing impurity removal methods and the inclusion of impurities in the vanadium precipitation process, the purity of vanadium pentoxide produced by this process is generally 98%~99%
[0004] In order to produce vanadium pentoxide products with a purity >99%, domestic scientific researchers have carried out a lot of research work and formed a new method for preparing vanadium pentoxide, most of which are based on crude vanadium products as raw materials, after alkali dissolution Then use sodium hydroxide, calcium hydroxide, sodium metaaluminate, sodium silicate, etc. to remove impurities and then prepare vanadium pentoxide. This method requires alkali dissolution and step-by-step removal of impurities. The cost is high and the process is complicated. , low yield

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1: Sodium roasted vanadium-containing solution, containing V 1.72g / L, Si 287.3mg / L, P 50.2mg / L, Mo53.0mg / L, Cr 10.7mg / L, pH=6.2, adjusted by adding ammonia water When the pH value reaches 8.8, add magnesium chloride according to 32.0 times of the total amount of silicon and phosphorus in the solution, add calcium chloride according to 16.0 times of the phosphorus content, stir and react at 60°C for 5 hours, and obtain silicon-phosphorus slag and solution by solid-liquid separation, and the V content in the solution 1.55g / L, Mo content is 53.6mg / L, Cr content is 10.9mg / L, Si content is 9.2mg / L, P content is 7.3mg / L, vanadium loss rate is 10.78%; 8.3, the solution and N263: 2-octanol: sulfonated kerosene mass ratio of 10:10:80 extractant is carried out in 4 stages of countercurrent extraction by volume ratio 4:1, to obtain the loaded organic phase and raffinate water phase, in the loaded organic phase The concentration of V is 5.78g / L, the vanadium extraction rate...

Embodiment 2

[0022] Example 2: Sodium roasted vanadium-containing solution, containing V 4.54g / L, Si 217.5mg / L, P 143.4mg / L, Mo125.0mg / L, Cr 52.5mg / L, pH=10.8, adjusted by adding hydrochloric acid When the pH value reaches 9.3, add magnesium chloride according to 10.4 times of the total amount of silicon and phosphorus in the solution, and add calcium chloride according to 2.7 times of the phosphorus content, stir and react at 80°C for 3 hours, separate solid-liquid to obtain silicon-phosphorus slag and solution, and V content in the solution 4.48g / L, Mo content is 130.1mg / L, Cr content is 54.6mg / L, Si content is 15.9mg / L, P content is 10.5mg / L, vanadium loss rate is 3.59%; Adjusted to 8.7, the solution and N263: isoamyl alcohol: sulfonated kerosene mass ratio 18:10:72 extractant is carried out 6 stages of countercurrent extraction by volume ratio 3:2, obtain the loaded organic phase and raffinate water phase, loaded organic The concentration of V in the phase is 6.37g / L, and the vanadium ...

Embodiment 3

[0023] Example 3: Sodium roasted vanadium-containing solution, containing V 15.33g / L, Si 892.1mg / L, P 537.5mg / L, Mo501.8mg / L, Cr 332.3mg / L, pH=9.5, hydrogenated and oxidized Adjust the pH value to 9.8 with sodium, add magnesium chloride according to 16.0 times of the total amount of silicon and phosphorus in the solution, add calcium chloride according to 5.4 times of the phosphorus content, stir and react at 100°C for 1 hour, and separate solid-liquid to obtain silicon-phosphorus slag and solution. The V content is 14.65g / L, the Mo content is 499.5mg / L, the Cr content is 330.8mg / L, the Si content is 20.5mg / L, the P content is 18.7mg / L, and the vanadium loss rate is 2.52%. The pH value was adjusted to 9.2, and the solution was subjected to 5-stage countercurrent extraction with N263: tert-amyl alcohol: sulfonated kerosene mass ratio of 15:8:77 in a volume ratio of 3:4 to obtain a loaded organic phase and a raffinate aqueous phase. The concentration of vanadium in the loaded or...

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PUM

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Abstract

The invention discloses a method of preparing vanadium pentoxide by using a vanadium-containing solution. The method is characterized in that the method consists of the following steps: a pH value of the vanadium-containing solution is adjusted, magnesium chloride and calcium chloride are added, solid-liquid separation is carried out and silicon-phosphorus residues and a solution are obtained; multistage countercurrent extraction is carried out and a load organic phase and a raffinate phase are obtained; a sodium-containing back-extractant and the load organic phase carry out primary washing, and post-washing liquid and a post-washing organic phase are obtained; and an ammonium-containing back-extractant and the post-washing organic phase carry out primary reextraction, and ammonium-containing vanadium-rich liquid and a half-load organic phase are obtained; the post-washing liquid and the half-load organic phase carry out countercurrent reextraction for many times, and sodium-containing vanadium-rich liquid and a no-load organic phase are obtained; pH values of the ammonium-containing vanadium-rich liquid and the sodium-containing vanadium-rich liquid are adjusted, NH4Cl is added, the solid-liquid separation is carried out and ammonium metavanadate is obtained, and ammonium metavanadate is calcined and then vanadium pentoxide with the grade being greater than or equal to 99.5% and vanadium pentoxide with the grade being 99.9% are obtained. The production operation is simple and feasible, the cost is low, and a recovery rate and the purity are high.

Description

technical field [0001] The invention belongs to the field of metallurgy, and in particular relates to a preparation method of vanadium pentoxide. Background technique [0002] Vanadium pentoxide has high added value and can be used in metallurgy, chemical industry, medicine, energy, environmental protection, aerospace and other industries. According to statistics, in 2012, the domestic demand for vanadium pentoxide products with a purity >99% was about 61,000 tons. With the development of domestic large aircraft projects and vanadium battery projects, it is expected that the domestic demand for vanadium pentoxide with a purity >99% will further increase. In addition, since all-vanadium redox flow batteries have begun commercial application in the United States, Canada, Europe, Japan, and Australia, it is expected that the demand for vanadium pentoxide with a purity >99% will further increase. [0003] At present, the relatively mature vanadium extraction process i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/44C22B3/40C22B34/22
CPCC22B3/44C22B34/22C22B3/402Y02P10/20
Inventor 刘勇刘珍珍周吉奎刘牡丹
Owner 广东省资源综合利用研究所
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