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Method for recycling vanadium extraction tailings

A technology for extracting vanadium tailings and vanadium slag, applied in the direction of improving process efficiency, etc., can solve the problem of low vanadium recovery rate, and achieve the effect of high utilization rate of vanadium resources, convenient operation and easy operation

Inactive Publication Date: 2011-11-23
INST OF PROCESS ENG CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing process of wet treatment of vanadium extraction tailings is to directly extract vanadium tailings by sulfuric acid leaching at a temperature above 100°C, and then obtain vanadium products through a vanadium precipitation process. The recovery rate of vanadium in this process is not high, about 70%.

Method used

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  • Method for recycling vanadium extraction tailings
  • Method for recycling vanadium extraction tailings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] This embodiment uses vanadium extraction tailings containing V 2 o 5 1.23% by weight.

[0033] 1) Ingredients: Put the vanadium extraction tailings screened to 200 mesh into the normal pressure reactor together with water and NaOH, wherein, NaOH 120g, H 2 O 40g, vanadium extraction tailings 40g, and add Na 3 VO 4 12H 2 O30g (to make eluent Na 3 VO 4 Concentration reaches saturation point 60g / L at 40 DEG C, thereby can crystallize and separate the alum of stripping), the weight ratio of NaOH and vanadium extraction tailings is 3: 1; The mass concentration of sodium hydroxide solution is 75wt%;

[0034] 2) Reaction: react the material prepared in step 1) in a normal pressure reactor, control the reaction temperature to 170° C., and the reaction time to 5 hours to obtain a reaction slurry;

[0035] 3) Dilution: after step 2) finishes, dilute the reaction slurry in the reactor with water, be diluted to the sodium hydroxide concentration in the slurry and be 200g / L, o...

Embodiment 2

[0040] This embodiment uses vanadium slag containing V 2 o 5 1.85% by weight.

[0041] 1) Ingredients: add vanadium extraction tailings, circulating fluid, and added NaOH to the atmospheric pressure reactor, wherein the weight ratio of NaOH to vanadium extraction tailings in the reaction system is 4:1; the mass concentration of NaOH solution in the reaction system is 85wt%; the NaOH concentration of the circulating fluid is 700g / L, Na 3 VO 4 Concentration is 45g / L, volume is 200ml; Weigh 40g of vanadium extraction tailings;

[0042] 2) Reaction: react the materials prepared in step 1) in a normal pressure reactor, control the reaction temperature to 220° C., and the reaction time to 3 hours to obtain a reaction slurry;

[0043] 3) Dilution: after step 2) finishes, dilute the reaction slurry in the reactor with the sodium hydroxide solution of 50g / L, be diluted to the slurry sodium hydroxide concentration and be 250g / L, obtain containing sodium hydroxide, vanadium Mixed sl...

Embodiment 3

[0048] This embodiment uses vanadium slag containing V 2 o 5 1.15% by weight.

[0049] 1) Ingredients: add vanadium extraction tailings, circulating liquid and additional NaOH into the atmospheric pressure reactor, wherein the mass ratio of NaOH to vanadium extraction tailings is 5:1; the mass concentration of sodium hydroxide solution in the reaction system It is 80wt%; the alkali concentration of the circulating liquid added is 305g / L, Na 3 VO 4 The concentration is 20.87g / L, and the volume is 520ml; that is, 41.4g of NaOH and 40g of vanadium extraction tailings are weighed;

[0050] 2) Reaction: react the materials prepared in step 1) in a normal pressure reactor, control the reaction temperature to 200° C., and the reaction time to 4 hours to obtain a reaction slurry;

[0051] 3) Dilution: after step 2) ends, water is used to dilute the reaction slurry in the reactor until the concentration of sodium hydroxide in the slurry is 300g / L to obtain sodium hydroxide, sodium ...

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Abstract

The invention relates to a method for recycling vanadium extraction tailings. The method comprises steps that: vanadium extraction tailings and NaOH are decomposed in a reactor; obtained reaction slurry is diluted by water or low concentration lye, such that mixed slurry is obtained; the mixed slurry is filtered under a temperature of 80 to 130 DEG C, such that an aqueous solution containing sodium hydroxide, sodium vanadate and sodium silicate is obtained; the solution is desilicated by using a desilication agent; the desilicated solution is naturally cooled and crystallized, such that vanadate is obtained. According to the method, the operation temperature is lower than the boiling point of the solution, the process can be carried out under normal pressure, and ventilation is not required, such that the method is easy to operate, and is safe. A recycling rate of vanadium is 93 to 99%, and a total vanadium content in a finished tailing is lower than 0.1 wt%, which is calculated according to the amount of vanadic anhydride. Compared to a fire roasting technology, the temperature adopted in the present method is greatly reduced, and the recycling rate of vanadium is increased by times. Compared to a present wet-processing technology, equipment requirement is simple, no pressure is required to be applied during the reaction process, and the recycling rate of vanadium is increased by approximately 25%.

Description

technical field [0001] The invention relates to a method for recovering vanadium from vanadium extraction tailings, in particular to a method for using sodium hydroxide solution to decompose the vanadium extraction tailings at normal pressure and recover vanadium. Background technique [0002] Vanadium is recognized as a rare resource and an important strategic metal in the world. It is widely used in steel, chemical industry, aerospace, electronic technology and other fields. It is called "the monosodium glutamate of modern industry". At present, about 90% of vanadium is used in the steel industry. It can refine the structure and grain of steel, increase the grain coarsening temperature, and enhance the performance of steel; the remaining 10% is used in titanium alloys, chemical industry and other fields. 88% of the world's annual output of vanadium is obtained from vanadium-titanium magnetite. my country's vanadium-titanium magnetite resources are relatively rich, and its ...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B3/12C22B3/44C22B34/22
CPCY02P10/20
Inventor 杜浩李兰杰王少娜郑诗礼刘彪张燕张懿牟文恒陈东辉刘晓华高明磊祁健黄荣艳
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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