Method for decomposing vanadium slag by liquid phase oxidation

A technology of liquid-phase oxidation and vanadium slag, which is applied in the direction of improving process efficiency, etc., can solve the problems of chlorine-containing gas emission polluting the environment, chromium cannot be recycled at the same time, and vanadium recovery rate is low, so as to improve industrial operability and facilitate Industrial implementation, high utilization effect

Active Publication Date: 2011-07-20
INST OF PROCESS ENG CHINESE ACAD OF SCI
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Problems solved by technology

[0005] The purpose of the present invention is to overcome the low vanadium recovery rate existing in the existing production method of vanadium slag sodium roasting and extracting vanadium, the associated chromium in the vanadium slag cannot be recycled at the same time, and the environment is polluted by the discharge of chlorine-containing gas during the production process, and Due to the shortcomings of

Method used

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  • Method for decomposing vanadium slag by liquid phase oxidation

Examples

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Effect test

Embodiment 1

[0025] The vanadium slag used in this example is the vanadium (chromium) pig iron (water) produced from vanadium-titanium magnetite through the blast furnace process, and then the vanadium slag formed by the vanadium extraction process using air as the oxidation medium under high temperature conditions .

[0026] 1) First prepare the reaction materials: according to NaOH and NaNO 3 The mass ratio is 0.2:1, NaOH and NaNO 3 The mass ratio of the total amount to the vanadium slag is 6: 1 and weighed; 50g is weighed less than 200 mesh Chenggang vanadium slag (V in the vanadium slag 2 o 5 The content is 10.22wt%, Cr 2 o 3 Content is 3.98wt%), 50g NaOH and 250g NaNO 3 ;

[0027] 2) Liquid-phase oxidation reaction: NaOH and NaNO prepared in step 1) 3 Put it in a normal pressure reactor, set the reaction temperature to 420°C, start to heat up; rise to 420°C, add vanadium slag to NaOH-NaNO 3 In the molten salt, air was introduced, the air flow rate was controlled at 1L / min, and...

Embodiment 2

[0031] The vanadium slag used in this example is the vanadium-containing (chromium) pig iron (water) produced by the direct reduction process of vanadium-titanium magnetite, and then the vanadium formed by the process of extracting vanadium from molten iron with oxygen as the oxidation medium under high temperature conditions scum.

[0032] 1) First prepare the reaction materials: weigh 100g Chenggang vanadium slag (V in the vanadium slag 2 o 5 Content is 7.3wt%, Cr 2 o 3 content is 3.6wt%), 400g NaOH and 100g NaNO 3 , NaOH and NaNO 3 The mass ratio is 4:1, NaOH and NaNO 3 The mass ratio of the total amount to the vanadium slag is 5:1;

[0033] 2) Liquid-phase oxidation reaction: NaOH and NaNO prepared in step 1) 3 Place it in a normal pressure reactor, set the reaction temperature to 330°C, start to heat up; rise to 330°C, add vanadium slag to NaOH-NaNO 3 In the molten salt, feed oxygen, the flow rate of oxygen is controlled at 0.2L / min, and react for 0.5 hour under t...

Embodiment 3

[0037]The vanadium slag used in this example is the vanadium (chromium)-containing pig iron (water) produced from vanadium-titanium magnetite through the blast furnace process, and then is formed by the process of extracting vanadium in a top-blown re-blown converter under high temperature conditions with air as the oxidizing medium of vanadium slag.

[0038] 1) First prepare the reaction material: weigh 200g of Chenggang vanadium slag less than 200 mesh (V in the vanadium slag 2 o 5 The content is 10.22wt%, Cr 2 o 3 Content is 3.98wt%), 400g NaOH and 100g NaNO 3 , NaOH and NaNO 3 The mass ratio is 4:1, NaOH and NaNO 3 The mass ratio of the total amount to the vanadium slag is 2.5:1;

[0039] 2) Liquid-phase oxidation reaction: NaOH and NaNO prepared in step 1) 3 Place it in a normal pressure reactor, set the reaction temperature to 480°C, start to heat up; rise to 480°C, add vanadium slag to NaOH-NaNO 3 In the molten salt, a mixed gas of air and oxygen was introduced,...

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Abstract

The invention relates to a method for decomposing vanadium slag by liquid phase oxidation. The method comprises the following steps of: weighing materials according to a mass ratio of NaOH to NaNO3 of 0.2:1-4:1 and the mass ratio of the total amount of the NaOH and the NaNO3 to the vanadium slag of 2.5:1-6:1; placing the weighed NaOH and NaNO3 into a normal-pressure reaction kettle; heating to the temperature of between 330 and 480 DEG C; adding the weighed vanadium slag into NaOH-NaNO3 molten salt; introducing oxidizing gas; performing liquid phase oxidation reaction at the temperature of between 330 and 480 DEG C for 0.5 to 6 hours to obtain reaction slurry; diluting the reaction slurry with a diluting agent until the sodium hydroxide concentration of feed liquid is between 100 and 500g/L to obtain mixed slurry of sodium hydroxide, sodium nitrate, sodium vanadate, sodium chromate and tailings; and performing filtering separation to obtain the tailings and aqueous solution containingvanadium and chromium. The method has a low reaction temperature, high safety and high utilization rate of vanadium and chromium resources, is operated under normal pressure and is easy to industrially implement, and the vanadium and the chromium in the vanadium slag are extracted together; and the decomposed tailings comprise 0.5 to 1 weight percent of vanadium (based on V2O5) and 0.5 to 1 weight percent of chromium (based on Cr2O3).

Description

technical field [0001] The invention relates to a production method for extracting vanadium from vanadium slag, in particular to a method for synchronously extracting vanadium and chromium by liquid-phase oxidation decomposition of vanadium slag. Background technique [0002] Vanadium is an important strategic metal, widely used in metallurgy, aerospace and chemical industry. The vanadium slag produced from vanadium-titanium magnetite in the iron and steel industry is the main raw material for vanadium extraction. The vanadium-containing pig iron produced by vanadium-titanium magnetite in the blast furnace or the direct reduction process, in the process of blowing vanadium by oxidation of molten iron, oxidizes vanadium and enters the slag to obtain vanadium-containing slag with high vanadium content. Vanadium-titanium magnetite generally contains chromium. During the process of blowing vanadium in the converter, because the properties of vanadium and chromium are similar, c...

Claims

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Application Information

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IPC IPC(8): C22B34/22C22B34/32C22B3/00
CPCY02P10/20
Inventor 郑诗礼杜浩王少娜王晓辉张懿陈东辉
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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