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Method for preparing high-purity vanadium pentoxide by using vanadium-contained material

A technology for vanadium pentoxide and materials, applied in the field of vanadium extraction, can solve the problems of low chlorination efficiency, high production cost and high chlorination temperature, and achieve the effects of reducing the generation of three wastes, less environmental pollution and mild process conditions

Active Publication Date: 2017-05-17
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] The current chlorination method is to add reducing agent for granulation, and there are problems of high chlorination temperature (greater than 500°C), low chlorination efficiency and high production cost

Method used

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  • Method for preparing high-purity vanadium pentoxide by using vanadium-contained material
  • Method for preparing high-purity vanadium pentoxide by using vanadium-contained material

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Experimental program
Comparison scheme
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Embodiment 1

[0081] The mass percentages of some components in the vanadium slag used in this embodiment are V8.90%, Cr1.37%, Al1.54%, Fe23.34%, Si6.46%, Ca1.05%, Mg1.75%.

[0082] The method for preparing high-purity vanadium pentoxide by using the vanadium slag comprises the following steps:

[0083] (1) Chlorination: get 105.5g of vanadium slag roasted at 900°C for 2h and mix with anhydrous aluminum trichloride and sodium chloride, wherein the molar ratio of vanadium pentoxide and anhydrous aluminum chloride in the vanadium slag is 1: 3. The molar ratio of anhydrous aluminum trichloride to sodium chloride is 3:2, the reaction temperature is 170°C, the nitrogen atmosphere is used as the carrier gas, and the reaction takes 2 hours to obtain vanadyl trichloride gas and alumina residue. The vanadium gas was condensed, and 20.89 g of vanadium oxychloride liquid was collected;

[0084] (2) Hydrolysis: hydrolyze 5mL vanadium oxychloride in 110mL dilute ammonia water (1+2), filter to obtain am...

Embodiment 2

[0089] The mass percentages of some components in the vanadium slag used in this embodiment are V5.08%, Cr5.20%, Al5.68%, Fe17.52%, Si14.80%, Ca0.50%, Mg6.19%.

[0090] The method for preparing high-purity vanadium pentoxide by using the vanadium slag comprises the following steps:

[0091] (1) Chlorination: The vanadium slag raw material is mixed with anhydrous aluminum trichloride and sodium chloride after roasting at 800°C for 1 hour, wherein the molar ratio of vanadium pentoxide to aluminum chloride in the vanadium slag is 1:1, without The molar ratio of aluminum trichloride to sodium chloride in water is 7:3, the reaction temperature is 160°C, the helium atmosphere is used as the carrier gas, and the reaction is carried out for 1 hour to obtain vanadyl trichloride gas and alumina residue, and oxychloride is collected by condensation. Vanadium liquid;

[0092] (2) Hydrolysis: 5mL of vanadyl trichloride is hydrolyzed in 50mL of high-purity water, and liquid-solid separatio...

Embodiment 3

[0097] The mass percentages of some components in the vanadium slag used in this embodiment are V8.06%, Cr1.35%, Al1.43%, Fe26.30%, Si7.03%, Ca1.07%, Mg1.68%.

[0098] The method for preparing high-purity vanadium pentoxide by using the vanadium slag comprises the following steps:

[0099] (1) Chlorination: the vanadium slag raw material is mixed with anhydrous aluminum trichloride and sodium chloride after roasting at 900°C for 3 hours, wherein the molar ratio of vanadium pentoxide to aluminum chloride in the vanadium slag is 1:2, without The molar ratio of aluminum trichloride to sodium chloride in water is 4:1, the reaction temperature is 170°C, the argon atmosphere is used as the carrier gas, and the reaction takes 3.5 hours to obtain vanadyl trichloride gas and alumina residue, and the trichloride is collected by condensation. Vanadyl liquid;

[0100] (2) Hydrolysis: 5mL of vanadyl trichloride is hydrolyzed in 100mL of ammonium chloride (pH is 9) aqueous solution, filter...

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Abstract

The invention provides a method for preparing high-purity vanadium pentoxide by using a vanadium-contained material. The method comprises the following steps: the vanadium-contained material is roasted to obtain a roasted product with the content of vanadium pentoxide below 49 wt%; then, the roasted product and a chlorinating agent are reacted in an inert atmosphere at a reaction temperature of 150-200 DEG C to obtain vanadium oxytrichloride gas and residues; the aftertreatment is performed for the vanadium oxytrichloride gas to obtain the high-purity vanadium pentoxide; and the chlorinating agent is selected from anhydrous aluminum trichloride or a mixture of anhydrous aluminum trichloride and sodium chloride. The method is mild in conditions, escapes vanadium in a gas form, is easy to separate vanadium from other substances, is higher in product purity, saves subsequent separation and impurity removal steps, and can obtain vanadium pentoxide products with the purity of not lower than 99%. The method is simple in technological process, short in needed reaction time, wide in raw material sources and easy to obtain raw materials, effectively reduces the production cost, reduces generation of three wastes, and is low in environmental pollution.

Description

technical field [0001] The invention belongs to the technical field of vanadium extraction, and relates to a method for preparing high-purity vanadium pentoxide from vanadium-containing materials, in particular to a method for cleanly producing vanadium pentoxide from vanadium-containing materials. Background technique [0002] Vanadium is recognized as a scarce resource and an important strategic substance in the world. Due to its excellent alloy properties and catalytic properties, vanadium is widely used in metallurgy, chemical industry, machinery, electronics, automobiles, railways and light industry. 85% of vanadium is Consumption in the iron and steel industry, among which high-purity vanadium oxide is used in high-precision fields such as all-vanadium redox flow batteries, vanadium-aluminum master alloys, electrode materials or catalysts. [0003] The raw materials for the production of vanadium products in my country mainly include vanadium slag, stone coal and vanad...

Claims

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Application Information

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IPC IPC(8): C22B34/22C22B1/02C01G31/02
CPCC01G31/02C01P2002/72C01P2006/80C22B1/02C22B34/22Y02P10/20
Inventor 张红玲姜单单董玉明朱光锦裴丽丽徐红彬张懿
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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