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Method for decomposing chromium-containing vanadium slag by using sodium hydroxide molten salt

A technology of sodium hydroxide and molten salt, applied in the direction of improving process efficiency, etc., can solve the problems of chlorine-containing gas polluting the environment, low recovery rate of vanadium, and non-recyclable chromium, etc., and achieve the effect of high resource utilization rate

Inactive Publication Date: 2011-07-20
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a method of using sodium hydroxide molten salt to decompose chromium-containing vanadium slag, which can greatly improve the resource utilization rate of vanadium at a roasting temperature lower than that of the traditional extraction process, and make the single conversion rate of vanadium It can be greater than 95%, and at the same time realize the efficient recovery and utilization of chromium, so that the Cr content in the tailings is reduced to 0.5-1wt% (calculated as Cr 2 o 3 In order to solve the problems of low vanadium recovery rate in the production process of vanadium slag sodium roasting and vanadium extraction, the associated chromium in vanadium slag cannot be recycled, and chlorine-containing gas pollutes the environment

Method used

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  • Method for decomposing chromium-containing vanadium slag by using sodium hydroxide molten salt

Examples

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Embodiment 1

[0027] This embodiment uses vanadium slag containing V 2 o 5 7.3wt%, Cr 2 o 3 3.6wt%, vanadium-titanium magnetite is produced by the blast furnace process to contain vanadium (chromium) pig iron (water), and then the vanadium slag formed by the process of vanadium extraction with air as the oxidation medium under high temperature conditions.

[0028] 1) First weigh the material: according to the mass ratio of the amount of sodium hydroxide to the vanadium slag is 2.5: 1, weigh a certain amount of NaOH and vanadium slag; that is, weigh 125g of NaOH and 50g of vanadium slag;

[0029] 2) Liquid-phase oxidation reaction: put the NaOH weighed in step 1) into the normal pressure reactor, set the temperature of the reactor to 500°C, and start to heat up; rise to 500°C, and then add the vanadium slag taken into the In NaOH molten salt, then feed air, the air flow rate is controlled at 1L / min, the reaction time is 6h, and the reaction slurry is obtained after the reaction;

[0030]...

Embodiment 2

[0033] This embodiment uses vanadium slag containing V 2 o 5 10.2wt%, Cr 2 o 3 4.0wt%, is the vanadium (chromium)-containing pig iron (water) produced by the direct reduction process of vanadium-titanium magnetite, and then the vanadium slag formed by the process of extracting vanadium from molten iron under high temperature conditions with oxygen as the oxidation medium.

[0034] 1) First weigh the material: according to the mass ratio of the amount of sodium hydroxide to the vanadium slag is 6: 1, weigh a certain amount of NaOH and vanadium slag; that is, weigh 600g of NaOH and 100g of vanadium slag;

[0035] 2) Liquid-phase oxidation reaction: put the NaOH weighed in step 1) into the normal-pressure reactor, set the temperature of the reactor to 600°C, and start to heat up; rise to 600°C, and then add the vanadium slag taken into the In NaOH molten salt, then feed oxygen, the flow rate of oxygen is controlled at 0.2L / min, the reaction time is 0.5h, and the reaction slurr...

Embodiment 3

[0039] This embodiment uses vanadium slag containing V 2 o 5 9.8wt%, Cr 2 o 3 10.2wt%, vanadium-titanium magnetite is produced by blast furnace process to contain vanadium (chromium) pig iron (water), and then the vanadium slag formed by the process of extracting vanadium by top-blown combined-blown converter with air as the oxidation medium under high temperature conditions.

[0040] 1) First weigh the material: according to the mass ratio of the amount of sodium hydroxide to the vanadium slag is 3: 1, take a certain amount of NaOH and vanadium slag; promptly weigh 750g of NaOH and 250g of vanadium slag;

[0041] 2) Liquid-phase oxidation reaction: put the NaOH weighed in step 1) into the normal-pressure reactor, set the temperature of the reactor to 550°C, and start to heat up; rise to 550°C, and then add the vanadium slag taken into the In NaOH molten salt, then pass into the mixed gas of air and oxygen, the air:oxygen volume ratio is 1:4, the gas flow rate is controlled...

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Abstract

The invention relates to a method for decomposing chromium-containing vanadium slag by using sodium hydroxide molten salt, which comprises the following steps of: weighing NaOH and the vanadium slag in a mass ratio of 2.5:1-6:1; putting the weighed NaOH into a normal pressure reaction kettle, heating to the temperature of between 500 and 600 DEG C, adding the weighed vanadium slag into the NaOH molten salt, introducing oxidizing gas and performing liquid-phase oxidation reaction at the temperature of between 500 and 600 DEG C for 0.5 to 6 hours to obtain reaction slurry after the reaction is finished; diluting by using a diluent until the concentration of the sodium hydroxide in the slurry is 100 to 500g / L to obtain mixed slurry containing the sodium hydroxide, sodium vanadate, sodium chromate and tailings; and performing filtering separation on the mixed slurry at the temperature of between 80 and 130 DEG C to obtain the tailings and aqueous solution containing vanadium and chromium.The decomposition temperature is lower than the conventional sodium treatment roasting temperature, vanadium and chromium resources can be co-extracted, the extraction ratio is high, and the method is easy to operate.

Description

technical field [0001] The invention relates to an alkali method for treating chromium-vanadium slag, in particular to a method for using sodium hydroxide molten salt to decompose chromium-vanadium slag. Background technique [0002] Vanadium is an important metal element, which is widely used in metallurgy and chemical industry. In the iron and steel industry, vanadium slag produced from vanadium-titanium magnetite is the main raw material for vanadium extraction. About 80% of vanadium compounds in my country are produced from vanadium slag. The vanadium-containing pig iron produced by vanadium-titanium magnetite through blast furnace or direct reduction process is further oxidized by selective oxidation of molten iron, so that vanadium is oxidized and enters the slag to obtain vanadium slag with high vanadium content. In the process of blowing vanadium in the converter, if the iron ore contains chromium, because the properties of vanadium and chromium are similar, the chr...

Claims

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Application Information

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IPC IPC(8): C22B34/22C22B34/32C22B7/04
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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