Method for decomposing vanadium slag under normal pressure by adding carbon-containing substance into sodium hydroxide solution

A technology of sodium hydroxide and vanadium slag, applied in the direction of improving process efficiency, can solve the problems of inability to achieve co-extraction of vanadium and chromium, insufficient vanadium extraction rate, etc., and achieve the effects of easy operation, improved extraction rate, and lower reaction temperature.

Inactive Publication Date: 2012-07-04
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

In this method, the extraction rate of vanadium is not high enough, and the total amount of vanadium in the tailings is 0.5-1wt% (in V 2 o 5 count)
In addition, the invention cannot realize the co-extraction of vanadium and chromium

Method used

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  • Method for decomposing vanadium slag under normal pressure by adding carbon-containing substance into sodium hydroxide solution
  • Method for decomposing vanadium slag under normal pressure by adding carbon-containing substance into sodium hydroxide solution

Examples

Experimental program
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Effect test

Embodiment 1

[0045] This embodiment uses vanadium slag containing V 2 o 5 10.45wt%, 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 process of extracting vanadium in a top-blown combined-blown converter with air as the oxidation medium under high temperature conditions.

[0046] 1) Ingredients: mix the vanadium slag and activated carbon evenly after screening to 200 meshes, and add them to the normal pressure reactor together with water and NaOH, wherein the mass ratio of NaOH to vanadium slag is 4:1; the mass ratio of vanadium slag to activated carbon is 10: 1; the mass concentration of sodium hydroxide solution is 80wt%; promptly take by weighing NaOH200g, vanadium slag 50g, gac 5g, water 50ml;

[0047] 2) Reaction: Put the material prepared in step 1) into a normal pressure reactor, and pass air into it for oxidation reaction, wherein the air flow rate is controlled at 1L / m...

Embodiment 2

[0051] This embodiment uses vanadium slag containing V 2 o 5 8.2wt%, is the vanadium (chromium) 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 in the top-blown combined-blown converter under high temperature conditions with oxygen as the oxidizing medium .

[0052] 1) Ingredients: Mix the vanadium slag and activated carbon evenly screened to 200 meshes and add them to the normal pressure reactor together with NaOH aqueous solution, wherein the mass ratio of NaOH to vanadium slag is 6:1; the mass ratio of vanadium slag to activated carbon is 3 : 1; the mass concentration of sodium hydroxide solution is 60wt%; namely take by weighing NaOH300g, vanadium slag 50g, gac 16.67g, ultrapure water 200ml;

[0053] 2) Reaction: Put the material prepared in step 1) into the normal pressure reactor, and pass in a mixed gas with a ratio of 1:1 of oxygen and air to carry out th...

Embodiment 3

[0057] This embodiment uses vanadium slag containing V 2 o 5 11.68wt%, 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 process of extracting vanadium in a top-blown combined-blown converter with air as the oxidation medium under high temperature conditions.

[0058] 1) Ingredients: Mix vanadium slag and activated carbon sieved to 150 mesh evenly and add them to the normal pressure reactor together with water and NaOH, wherein the mass ratio of NaOH to vanadium slag is 5:1, and the mass ratio of vanadium slag to activated carbon is 10: 1; the mass concentration of sodium hydroxide solution is 70wt%; namely take by weighing NaOH250g, vanadium slag 50g, gac 5g, ultrapure water 107ml;

[0059] 2) Reaction: put the material prepared in step 1) into the normal pressure reactor, and pass through oxygen to carry out oxidation reaction, wherein, the flow rate of oxygen is ...

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Abstract

The invention relates to a method for decomposing vanadium slag under normal pressure and extracting vanadium and chromium by adding a carbon-containing substance into a sodium hydroxide solution. The method comprises the following steps of: uniformly mixing the vanadium slag and the carbon-containing substance, and adding the mixture, water and NaOH into a normal pressure reactor; introducing oxidizing gas for oxidization reaction, and diluting reaction slurry obtained by the reaction by using a diluent to obtain mixed slurry containing NaOH, sodium vanadate, sodium chromate, sodium silicate and tailings; and filtering and separating the mixed slurry to obtain the tailings, and an alkaline solution containing the vanadium and the chromium. The operating temperature of the method is below the boiling point of the solution, and the method can be implemented under normal pressure, and is easy to implement and high in safety; and the operating temperature is far lower than the temperature of the traditional vanadium extracting process, the extraction ratio of the vanadium is high, the chromium can be partially extracted synchronously, the total vanadium contained in the tailings is 0.2 to 0.6 weight percent (based on V2O5), and the leaching rate of the chromium is 8-20 percent.

Description

technical field [0001] The invention relates to a method for wet treatment of vanadium slag, in particular to a method for extracting vanadium and chromium by adding carbonaceous matter to a sodium hydroxide solution to decompose the vanadium slag under normal pressure. Background technique [0002] Vanadium slag is a vanadium-enriched material produced by blowing vanadium-containing molten iron in the presence of oxygen-containing gas. In the iron and steel industry, vanadium slag produced from vanadium-titanium magnetite is the main raw material for extracting vanadium. The composition of vanadium slag is related to the production method and the composition of vanadium-titanium magnetite. Generally speaking, vanadium slag is composed of V 2 o 5 , SiO 2 、Al 2 o 3 , MgO, Cr 2 o 3 、TiO 2 , CaO and other components, and the composition of vanadium slag in each factory is also very different, but its phase structure is basically the same, all composed of spinel, olivine,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C22B3/12C22B34/22C22B34/32
CPCY02P10/20
Inventor 杜浩郑诗礼王少娜王大卫张懿
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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