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Method for decomposing vanadium slag under normal pressure with sodium hydroxide solution

A sodium hydroxide and solution technology is applied in the field of vanadium extraction by decomposing vanadium slag with sodium hydroxide solution at atmospheric pressure, which can solve the problems of high roasting temperature, high calcification roasting roasting temperature and high energy consumption, and achieves reduction of slag discharge and improved extraction. rate, the effect of lowering the reaction temperature

Active Publication Date: 2011-07-20
INST OF PROCESS ENG CHINESE ACAD OF SCI
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AI Technical Summary

Problems solved by technology

The recovery rate of vanadium in the sodium roasting process is low, the recovery rate of vanadium in a single roasting is about 70%, and the recovery rate of vanadium after multiple roasting is only 80%; the roasting temperature is high (750-850 ° C), and multiple roasting is required , high energy consumption; in the roasting process will produce harmful HCl, Cl 2 and other corrosive gases, polluting the environment
[0004] Chinese patent CN101215005A proposes a method for roasting vanadium slag and sodium salt (sodium carbonate, sodium chloride) or potassium salt (potassium carbonate, potassium chloride). This patent is suitable for high silicon and low vanadium vanadium slag, and the roasting temperature is 700 -820°C, multi-temperature stage roasting, by controlling the temperature system and salt ratio, it can prevent the furnace material from sintering, make the process go smoothly, and also reduce the roasting holding time, and the V in the tailings 2 o 5 Content can reach 0.5-1wt%; Chinese patent CN1884597A, CN86108218A etc. all have carried out different improvement to the additive of sodium roasting process and temperature system, basic principle all is by using the additive (Na 2 CO 3 , NaCl, Na 2 SO 4 、Na 2 SO 3 etc.) and different temperature systems to improve and increase the extraction rate of vanadium, roasting time, furnace charge sintering and other indicators, but the above process is basically the same as the traditional sodium roasting principle, operation process, and operating temperature, and it is impossible to avoid excessive roasting temperature. The problem of high traditional craft
But the roasting temperature of calcification roasting is still very high (600-950°C)

Method used

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  • Method for decomposing vanadium slag under normal pressure with sodium hydroxide solution
  • Method for decomposing vanadium slag under normal pressure with sodium hydroxide solution

Examples

Experimental program
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Effect test

Embodiment 1

[0025] This embodiment uses vanadium slag containing V 2 o 5 7.3wt%, vanadium-titanium magnetite is produced by blast furnace process to contain vanadium (chromium) pig iron (water), and then the vanadium slag formed by shaking bag vanadium extraction process with air as oxidation medium under high temperature conditions.

[0026] 1) Ingredients: add vanadium slag screened to -200 mesh together with water and NaOH into a normal pressure reactor, wherein the mass ratio of NaOH to vanadium slag is 2:1; the mass concentration of sodium hydroxide solution is 80wt%; Weigh NaOH 100g, weigh vanadium slag 50g;

[0027] 2) Reaction: put the material prepared in step 1) into the normal pressure reactor, and pass air into it to carry out the oxidation reaction, wherein, the air flow rate is controlled at 1L / min, the reaction temperature is controlled at 180°C, and the reaction time is 6h, to obtain reaction slurry;

[0028] 3) Dilution: when step 2) finishes, dilute the reaction slurr...

Embodiment 2

[0031] This embodiment uses vanadium slag containing V 2 o 5 7.3wt%, 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.

[0032] 1) Ingredients: add vanadium slag, water and NaOH into the normal pressure reactor, wherein the mass ratio of NaOH to vanadium slag is 2.4:1; the mass concentration of sodium hydroxide solution is 80wt%; Vanadium slag 100g;

[0033] 2) Reaction: put the material prepared in step 1) into a normal pressure reactor, and feed oxygen to carry out oxidation reaction, wherein the flow rate of oxygen is controlled at 0.2L / min, the reaction temperature is controlled at 240°C, and the reaction time is 3h. Obtain reaction slurry;

[0034] 3) Dilution: after step 2) finishes, dilute the reaction slurry in the reactor with the ...

Embodiment 3

[0037] This embodiment uses vanadium slag containing V 2 o 5 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.

[0038] 1) Ingredients: add the vanadium slag after being wet milled for half an hour into the normal pressure reactor together with water and NaOH, wherein the mass ratio of NaOH to vanadium slag is 6:1; the mass concentration of the sodium hydroxide solution is 65wt %; Namely take NaOH 1200g, weigh vanadium slag 200g;

[0039] 2) Reaction: put the material prepared in step 1) into the normal pressure reactor, and pass into the mixed gas of air and oxygen to carry out the oxidation reaction, wherein the air: oxygen volume ratio is 4: 1, and the flow rate of the gas is controlled at 0.5L / min, the controlled reaction tem...

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Abstract

The invention relates to a method for extracting vanadium by decomposing vanadium slag under normal pressure with sodium hydroxide solution. The method comprises the following steps of: adding vanadium slag or preprocessed vanadium slag, water and NaOH into a normal pressure reactor, wherein the mass ratio of NaOH to the vanadium slag is (2-6): 1, and the mass concentration of the sodium hydroxide solution is 65-90wt%; oxidizing in the presence of an oxidizing gas at the temperature 180-260 DEG C for 0.5-6 hours, and then diluting the obtained reaction sizing agent with diluent, thus mixed sizing agent containing sodium hydroxide, sodium vanadate, sodium chromate and slag tailing is obtained; and filtering and separating the mixed sizing agent at the temperature of 80-130 DEG C, thus the slag tailing and aqueous solution containing vanadium are obtained. The method provided by the invention has the advantages that the operating temperature is below the boiling temperature of solution, the process can be carried out under normal pressure, the operation is easy, and the safety is good; and the operating temperature is far less than the operating temperature of the traditional vanadium extracting process, the extraction ratio of vanadium is high, and the total vanadium content in the slag tailing is 0.5-1wt% (taking the weight of V2O5 as the basis).

Description

technical field [0001] The invention relates to a method for wet treatment of vanadium slag, in particular to a method for extracting vanadium by decomposing vanadium slag under normal pressure with a sodium hydroxide solution. 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 vanadium extraction. 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, quartz, etc. [0003] Enterprises that us...

Claims

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Application Information

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IPC IPC(8): C22B34/22C22B3/12C22B3/22
CPCY02P10/20
Inventor 郑诗礼杜浩王少娜王晓辉张懿
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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