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Method for recovering vanadium by decomposing vanadium extraction tailings by using sodium hydroxide solution

A technology for extracting vanadium tailings and sodium hydroxide, applied in the direction of improving process efficiency, etc., can solve the problems of high reaction temperature, long process, poor economy, etc., and achieve the goal of lowering reaction temperature, realizing regeneration cycle, and reducing slag discharge Effect

Active Publication Date: 2013-01-16
INST OF PROCESS ENG CHINESE ACAD OF SCI +1
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Problems solved by technology

Chinese patents CN1884597A and CN86108218A are improvements based on the original sodium roasting, such as grinding the vanadium slag particle size to 2-3 times the spinel particle size to promote the dissolution of vanadium, or improving and optimizing the sodium salt additive ( Such as adding potassium salts, peroxides, etc. Substantial breakthroughs have been made in the effect of vanadium extraction, the extraction rate of vanadium is less than 40%, and the roasting process has high energy consumption, serious environmental pollution, and poor economy; Kunming University of Science and Technology uses sulfuric acid or hydrofluoric acid for acid leaching under pressure or normal pressure Extract vanadium from vanadium extraction tailings. The recovery rate of vanadium in this method can reach 80%, and the leaching time is short. However, impurities such as Fe, Al, and Ti also enter the solution. Strong corrosion, higher requirements on equipment materials
The above reduction roasting processes are all through high temperature carbonization reduction roasting above 1000°C, and then separated to obtain the vanadium-containing phase, which has the problems of complex operation process, long process, high reaction temperature, and low vanadium recovery rate (less than 50%)
[0008] (3) Use vanadium-extracting tailings as building materials and pigment coatings. For example, Panzhihua Iron and Steel Research Institute conducted research on using vanadium-extracting tailings as far-infrared coatings, and Shandong New Materials Research Institute conducted a study on vanadium-extracting tailings. Research on vanadium-titanium black porcelain pigments, but it is difficult to meet the standards for building materials due to the high alkali content in the tailings, and the market capacity of the applied pigment coatings is relatively limited, and it is difficult to absorb a huge amount of vanadium-extracted tailings

Method used

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  • Method for recovering vanadium by decomposing vanadium extraction tailings by using sodium hydroxide solution

Examples

Experimental program
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Effect test

Embodiment 1

[0032] This embodiment uses vanadium extraction tailings containing V 2 o 5 1.85 wt%.

[0033] 1) Ingredients: Add the tailings of vanadium extraction sieved to -200 mesh into the high-pressure reactor together with circulating fluid, water, and NaOH, among which 270mL of circulating fluid (NaOH concentration 320.56g / L, NaOH concentration 320.56g / L, NaOH 3 VO 4 Concentration is 19.64g / L, Na 2 SiO3 Concentration is 14.20g / L), NaOH 55g, H 2 O 10g, vanadium extraction tailings 50g, the weight ratio of NaOH aqueous solution and vanadium extraction tailings is 6: 1; The mass concentration of sodium hydroxide solution is 35wt%;

[0034] 2) Reaction: react the material prepared in step 1) in a pressure reactor, control the reaction temperature to 250° C., the pressure in the reactor during the reaction is 21 atm, and the reaction time is 1 h to obtain a mixed slurry;

[0035] 3) Filtration and separation: the mixed slurry obtained in step 2) was filtered and separated at 115°C ...

Embodiment 2

[0039] This embodiment uses vanadium extraction tailings containing V 2 o 5 1.45 wt%.

[0040] 1) Ingredients: put the unscreened vanadium extraction tailings into the high pressure reactor together with the circulating fluid and added NaOH, wherein, 220mL of circulating fluid (NaOH concentration 420.21g / L, NaOH concentration 420.21g / L, NaOH 3 VO 4 Concentration is 16.66g / L, Na 2 SiO 3 Concentration is 20.20g / L), vanadium extraction tailings 50g, added NaOH is 70g, the weight ratio of NaOH aqueous solution and vanadium extraction tailings is 5: 1; The mass concentration of NaOH in the reaction system is 50wt%;

[0041] 2) Reaction: react the material prepared in step 1) in a pressure reactor, control the reaction temperature to 170° C., the pressure in the reactor during the reaction is 3.5 atm, and the reaction time is 5 hours to obtain a mixed slurry;

[0042] 3) Filtration and separation: the mixed slurry obtained in step 2) was filtered and separated at 80°C to obtai...

Embodiment 3

[0046] This embodiment uses vanadium extraction tailings containing V 2 o 5 1.05 wt%.

[0047] 1) Ingredients: put the unscreened vanadium extraction tailings into the high pressure reactor together with the circulating liquid and added NaOH, wherein, the circulating liquid is 345mL (NaOH concentration 280.21g / L, NaOH concentration 280.21g / L, NaOH 3 VO 4 Concentration is 32.66g / L, Na 2 SiO 3 Concentration is 34.20g / L), vanadium extraction tailings 50g, added NaOH is 7g, the weight ratio of NaOH aqueous solution and vanadium extraction tailings is 8: 1; The mass concentration of NaOH in the reaction system is 20wt%;

[0048] 2) Reaction: react the material prepared in step 1) in a pressure reactor, control the reaction temperature to 280° C., the pressure in the reactor during the reaction is 53.5 atm, and the reaction time is 7 hours to obtain a reaction slurry;

[0049] 3) Filtration and separation: the mixed slurry obtained in step 2) was filtered and separated at 90°C...

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Abstract

The invention relates to a method for recovering vanadium by decomposing vanadium extraction tailings by using a NaOH solution under pressure. The process flow is shown in an attached drawing. The method comprises the following steps of: adding vanadium extraction tailings, a circulation fluid, and supplemented NaOH or a supplemented NaOH aqueous solution into a reactor and reacting, cooling obtained reaction slurry to a temperature of 80 to 130 DEG C, filtering to obtain an aqueous solution containing sodium hydroxide, sodium vanadate and sodium silicate, naturally cold-crystallizing the solution to obtain sodium vanadate and crystallization mother liquor, adding a desiliconization agent into the crystallization mother liquor for treatment, and returning an obtained solution which is taken as the circulation fluid. By the method, the circulation fluid is not required to be evaporated and concentrated and can directly enter the next reaction, gas is not required to be introduced, the recovery rate of vanadium is 80 to 95 percent, and the total content of vanadium in final slag is less than 0.2 weight percent (based on vanadium pentoxide). Compared with a fire roasting process, the method has the advantages that the temperature is greatly reduced, and the recovery rate of vanadium is greatly increased.

Description

technical field [0001] The invention relates to a method for wet treatment of tailings for vanadium extraction, in particular to a method for recovering vanadium by decomposing tailings for vanadium extraction with sodium hydroxide solution. Background technique [0002] Vanadium is an important strategic metal resource, widely used in steel, aviation, chemical industry, metallurgy and other industries. The iron and steel industry is the largest user of vanadium resources, consuming about 85% of vanadium. In recent years, with the rapid development of my country's iron and steel industry, the demand for vanadium has expanded rapidly. Only to meet the consumption of vanadium in iron and steel production, the output of vanadium will increase by more than 30% every year, and the development space is huge. It is estimated that in the next few years, my country will become the most potential market for vanadium products in the world. [0003] In nature, vanadium is mainly symbi...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B3/12C22B3/20C22B34/22
CPCY02P10/20
Inventor 郑诗礼王少娜李兰杰杜浩张懿陈东辉白瑞国
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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