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Method for separating enrichment tetravalent vanadium through capacitive deionized technology

A capacitive deionization, separation and enrichment technology is applied in the field of vanadium extraction by hydrometallurgy, which can solve the problems of loss of extractant, complicated operation and high content, and achieve the effects of small consumption of chemicals, good separation effect and simple operation.

Active Publication Date: 2017-09-08
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the low vanadium content in stone coal, the vanadium concentration in the vanadium extraction acid leaching solution is usually low, and there are many impurity ions and high content, which is not conducive to the subsequent vanadium precipitation operation
The patent with the publication number CN104018011A introduces a production method of vanadium pentoxide. The vanadium pentoxide product is obtained through six processes of extraction, washing, back extraction, acidic ammonium salt precipitation, washing precipitate and calcination. The three steps of washing and stripping to separate and purify vanadium from the acid leaching solution are the key links. This process is complicated to operate, and a large amount of extractant is used, and the cost is high. In addition, the loss of extractant will inevitably occur during the production process. , causing great environmental pollution
[0004] Traditional solvent extraction, separation and enrichment of vanadium-containing solution uses a large amount of extractant in the separation process, the operation is complicated, the cost is high, and the loss of extractant will inevitably occur in the production process, which will cause great environmental pollution.

Method used

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  • Method for separating enrichment tetravalent vanadium through capacitive deionized technology
  • Method for separating enrichment tetravalent vanadium through capacitive deionized technology
  • Method for separating enrichment tetravalent vanadium through capacitive deionized technology

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Embodiment 1

[0021] A method for separating and enriching tetravalent vanadium using capacitive deionization technology, the specific steps of its treatment process are as follows figure 1 shown.

[0022] (1) Preparation of loaded activated carbon: Add 10 g of activated carbon into 100 mL of P204 with a volume fraction of 10 to 15%, ultrasonically stir at 40 to 50 r / min for 1 to 1.5 h, and separate the solid from the solid into a solid with a solid mass of 10 to 1.5 h. 11.5 times of pure water washing, and then vacuum drying the washed solid at 40-50°C for 3-4 hours to obtain activated carbon loaded with P204;

[0023] (2) Preparation of electrode plate: Take 5g of loaded activated carbon powder obtained in step (2), add 0.45-0.5g of binder polyvinylidene fluoride (PVDF), 15-25mL of solvent dimethylacetamide (DMAC) , 120r / min ultrasonic stirring for 1h to obtain the loaded activated carbon slurry, and then spray the loaded activated carbon slurry on both sides of the high-purity graphite ...

Embodiment 2

[0029] A method for separating and enriching tetravalent vanadium using capacitive deionization technology, the specific steps of its treatment process are as follows figure 1 Shown:

[0030] (1) Preparation of supported carbon nanotubes: add 10g of carbon nanotubes into 100ml of P507 with a volume fraction of 15-22%, ultrasonically stir at 50-60r / min for 1.5-2h, and separate the solid from the solid into a solid 12-13 times the mass of pure water is washed, and then the washed solid is vacuum-dried at 50-60° C. for 4.5-5.5 hours to obtain carbon nanotubes loaded with P507.

[0031] (2) Preparation of electrode plate: Take 5g of loaded carbon nanotubes obtained in step (2), add 0.5-0.6g of binder polyvinylidene fluoride (PVDF), 25-30mL of solvent dimethylacetamide (DMAC ), 125r / min ultrasonic stirring for 1.5h to obtain the loaded carbon nanotube slurry, and then spray the loaded carbon nanotube slurry on both sides of the collector-coated titanium electrode, and then vacuum-...

Embodiment 3

[0037] A method for separating and enriching tetravalent vanadium using capacitive deionization technology, the specific steps of its treatment process are as follows figure 1 Shown:

[0038] (1) Preparation of loaded carbon nanofibers: add 10 g of carbon nanofibers into 100 ml of P508 with a volume fraction of 22 to 30%, ultrasonically stir at 60 to 70 r / min for 2 to 3 hours, and separate the solid and liquid from the obtained solid with Washing with pure water 13-15 times the mass of the solid, and then vacuum-drying the washed solid at 40-50° C. for 5.5-7 hours to obtain carbon nanofibers loaded with P508.

[0039] (2) Preparation of electrode plate: Take 5g of loaded carbon nanofibers obtained in step (2), add 0.6-0.85g of binder polyvinylidene fluoride (PVDF), 30-40mL of solvent dimethylacetamide (DMAC ), 130r / min ultrasonic stirring for 2h, to obtain the loaded extractant material slurry, and then spray the loaded extractant material slurry on both sides of the high-pur...

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Abstract

The invention belongs to the field of hydrometallurgy vanadium extraction and particularly relates to a method for separating enrichment tetravalent vanadium through a capacitive deionized technology. The method comprises the following steps that (1), a carbon material is mixed with an acid phosphonium extraction agent, and a carbon-loaded material is obtained; (2) the carbon-loaded material, a binder and a solvent are mixed according to a certain proportion, the surface of a collector electrode is evenly sprayed and coated (painted) with the carbon-loaded material, the binder and the solvent, and after drying, an electrode plate is obtained; (3), the electrode plate is parallelly placed in a deionized module, a direct-current power supply is connected, and then a tetravalent vanadium solution with pH being 1.2-3 is inlet into the capacitive deionized module to conduct adsorption treatment; and (4), after adsorption is completed, the positive and negative anodes of the electrode plate are short connected or reversely connected, dilute sulphuric acid is inlet to conduct the desorption process, and finally, a vanadium enriched solution is obtained. The method for separating the enrichment tetravalent vanadium through the capacitive deionized technology has the advantages of being easy to operate, little in energy consumption, few in agent dosage, environmentally friendly and the like.

Description

technical field [0001] The invention belongs to the field of vanadium extraction by hydrometallurgy, and in particular relates to a method for separating and enriching tetravalent vanadium by using capacitive deionization technology. Background technique [0002] Capacitive deionization method is a new type of desalination technology using electrical method, which is widely used in desalination of seawater, desalination of industrial and agricultural water and desalination of domestic water. For example, the patent with the publication number CN104909439A introduces a method for electro-adsorption desalination of saline wastewater, and the effect of desalination is achieved by electro-adsorption treatment of saline wastewater. However, capacitive deionization technology lacks the application in resource recycling. [0003] Stone coal is a unique vanadium-containing resource in my country, and the clean and efficient extraction of vanadium from stone coal has always been a r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B34/22C22B3/24
CPCC22B3/24C22B34/22Y02P10/20
Inventor 包申旭崔永永张一敏刘涛黄晶
Owner WUHAN UNIV OF TECH