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Method for determination of concentration of low valence vanadium in vanadium-containing electrolyte

A technology of electrolyte and concentration, which is applied in the direction of chemical analysis by titration, which can solve the problems of inconvenient, large amount of calculation, unsuitable for industrial production, etc.

Inactive Publication Date: 2014-09-24
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned complicated method is very inconvenient to apply, and has a large amount of computation and high time cost, so it is not suitable for industrial production applications

Method used

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  • Method for determination of concentration of low valence vanadium in vanadium-containing electrolyte

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preparation example

[0033] Solution 1: Preparation of Tetravalent Vanadium (VO 2+ ) Solution 1 with a concentration of 1.70mol / L.

[0034] Accurately weigh 277.1g of vanadyl sulfate solid and place it in a beaker with a volume of 500mL, add 300mL of deionized water, stir the mixture to dissolve it to obtain a vanadyl sulfate solution, then measure 141mL of concentrated sulfuric acid with a mass fraction of 98% and slowly Add it to the above-mentioned vanadyl sulfate solution, continue to stir and let it cool to room temperature, then transfer to a 1L volumetric flask, rinse the beaker twice, then dilute to 1L with deionized water, shake well and set aside.

[0035] Solution 2: Preparation of trivalent vanadium (V 3+ ) concentration of 0.85mol / L and tetravalent vanadium (VO 2+ ) Solution II with a concentration of 0.85mol / L.

[0036] Solution 1 was taken as the stock solution, and solution 2 was prepared by electrolysis with a vanadium redox cell. Put 1 volume of solution 1 on the positive ele...

Embodiment 1

[0046] Take 4mL (solution 1) blue tetravalent vanadium system vanadium-containing electrolyte and 70mL deionized water in a 150mL beaker, and use magnetic stirring. Using a fully automatic potentiometric titrator, add 0.1mol / L KMnO dropwise to the beaker 4 solution, the volume of potassium permanganate solution consumed when the first potential breakthrough point was recorded after 136 seconds was 13.560mL. Continue to drop KMnO 4 Solution, the solution is purple, indicating that all vanadium exists in the pentavalent state, KMnO 4 Excess solution.

[0047] The concentration of tetravalent vanadium is C IV =5×13.560mL×0.1mol / L÷(4mL)=1.695mol / L

Embodiment 2

[0049] Take 4mL (solution 2) green trivalent vanadium / tetravalent vanadium system vanadium-containing electrolyte and 70mL deionized water in a 150mL beaker, and use magnetic stirring. Using a fully automatic potentiometric titrator, add 0.1mol / L KMnO dropwise to the beaker 4 solution, the volume of potassium permanganate solution consumed when the first potential break point was recorded after 69 seconds was 6.896mL, and the total volume of potassium permanganate solution consumed when the second potential break point was recorded after 205 seconds was 20.437mL. Continue to drop KMnO 4 Solution, the solution is purple, indicating that all vanadium exists in the pentavalent state, KMnO 4 Excess solution.

[0050] The concentration of trivalent vanadium is C III =5×6.896mL×0.1mol / L÷(4mL)=0.862mol / L

[0051] The concentration of tetravalent vanadium is C IV =5×(20.437ml-2×6.896ml)×0.1mol / L÷(4mL)=0.831mol / L

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Abstract

The invention discloses a method for the determination of concentration of low valence vanadium in a vanadium-containing electrolyte, and the method is characterized in that: the valence of vanadium in the vanadium-containing electrolyte can be judged according to the color of the vanadium-containing electrolyte, and the number of electric potential jump points can be determined; then the vanadium-containing electrolyte can be titrated by use of a potassium permanganate standard titration solution, electric potentials corresponding to electric potential jump points can be indicated by an electrode in the titration process of the vanadium-containing electrolyte; and finally the concentration of the low valence vanadium in the vanadium-containing electrolyte can be calculated according to the consumption of the potassium permanganate standard titration solution when the vanadium-containing electrolyte reaches the electric potentials of the electric potential jump point. The method can be used for rapid determination of the low valence vanadium in the vanadium-containing electrolyte, and the method also has the advantages of simple operation and low cost.

Description

technical field [0001] The invention relates to a method for measuring the concentration of low-valent vanadium in a vanadium-containing electrolytic solution. Background technique [0002] At present, the methods for testing the concentration of vanadium mainly include: ultraviolet-visible spectrophotometry, atomic absorption method and redox potential titration method. The atomic absorption method can only measure the total vanadium concentration, but cannot obtain the concentration of vanadium in each valence state. Although ultraviolet-visible spectrophotometry can measure the concentration of vanadium in various valence states, the equipment is expensive and bulky, and it is not convenient for rapid on-site determination. At the same time, this method also needs to prepare a series of standard solutions to obtain a standard curve, which increases the workload. When determining the concentration of vanadium by oxidation-reduction potential titration, it is generally nec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N31/16
Inventor 杨林江彭毅彭穗陈文龙李道玉毛凤娇曹敏
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP