Vanadium pentoxide preparation method

A technology of vanadium pentoxide and pentavalent vanadium, applied in vanadium oxide and other directions, can solve the problems of influence of vanadium product purity, increase recovery cost, difficult to remove, etc., and achieve the effects of low cost, reduced emission and mild reaction

Inactive Publication Date: 2017-12-22
PANGANG GROUP RESEARCH INSTITUTE CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are obvious defects in this type of method: a large amount of impurities such as Na and K are introduced into the electrolyte, and these impurity elements are difficult to remove during the vanadium extraction process, so they enter the product, which affects the purity of the prepared vanadium product ; Moreover, additional use of pH regulators is required, which increases the cost of recycling

Method used

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Experimental program
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Effect test

Embodiment 1

[0038] Embodiment 1 adopts the inventive method to prepare vanadium pentoxide

[0039] 1. Unification of vanadium valence state: take the molar concentration of total vanadium as 1.5mol / L (wherein the molar concentration of non-pentavalent vanadium is 1.0mol / L), H 2 SO 4 Concentration of 3mol / L vanadium battery positive and negative electrolyte 200mL; add hydrogen peroxide 14mL to the electrolyte, and react for 20min under the condition of ultrasonic frequency of 20KHz.

[0040] 2. Adjustment of system acidity: filter, add 1000mL of distilled water to the filtrate, and adjust the pH value to 0.

[0041] 3. Precipitation of vanadium: heat up the electrolyte solution obtained from acid adjustment to 80°C at a speed of 5 rpm, react the system at a speed of 5 rpm, and react for 40 minutes at 80°C, keep the speed constant and stir to cool to room temperature (25 ~30°C), filtered, and the precipitate was taken for pickling.

[0042] 4. Acid washing: Add distilled water with pH=0 ...

Embodiment 2

[0046] Embodiment 2 adopts the inventive method to prepare vanadium pentoxide

[0047]1. Unification of vanadium valence state: take the molar concentration of total vanadium as 1.6mol / L (wherein the molar concentration of non-pentavalent vanadium is 1.0mol / L), H 2 SO 4 Concentration of 3mol / L vanadium battery positive and negative electrolyte 200mL; add hydrogen peroxide 17mL to the electrolyte, and react for 15min under the condition of ultrasonic frequency 30KHz.

[0048] 2. Adjustment of system acidity: filter, add 1.2mL of distilled water to the filtrate, and adjust the pH value to 1.

[0049] 3. Precipitation of vanadium: heat up the electrolyte solution obtained from acid adjustment to 90°C at a speed of 10 rpm, react the system at a speed of 10 rpm and 90°C for 30 minutes, keep stirring and cool to room temperature (25 ~30°C), filtered, and the precipitate was taken for pickling.

[0050] 4. Acidic washing: add distilled water with a pH of 1 times the volume of the ...

Embodiment 3

[0054] Embodiment 3 adopts the inventive method to prepare vanadium pentoxide

[0055] 1. Unification of the vanadium valence state: take the molar concentration of total vanadium as 1.7mol / L, of which the molar concentration of non-pentavalent vanadium is 1.0mol / L), H 2 SO 4 Concentration of 3mol / L vanadium battery positive and negative electrolyte 200mL; add hydrogen peroxide 20mL to the electrolyte, and react for 10min under the condition of ultrasonic frequency 40KHz.

[0056] 2. Adjustment of system acidity: filter, add 1.2mL of distilled water to the filtrate, and adjust the pH value to 1.

[0057] 3. Precipitation of vanadium: heat up the electrolyte solution obtained from acid adjustment to 100°C at a speed of 15 rpm, react the system at a speed of 15 rpm and 100°C for 20 minutes, keep stirring at a constant speed and cool to room temperature (25 ~30°C), filtered, and the precipitate was taken for pickling.

[0058] 4. Acidic washing: add distilled water with a pH o...

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Abstract

The invention discloses a pentavalent vanadium preparation method which includes the steps: adding hydrogen peroxide into vanadium battery positive electrode and / or negative electrode electrolyte; performing reaction under the action of ultrasonic waves; oxidizing non-pentavalent vanadium in the electrolyte into pentavalent vanadium. The invention further discloses a vanadium pentoxide preparation method which includes the steps: preparing the pentavalent vanadium by the method; adjusting acid; settling vanadium; performing acid washing to obtain vanadium pentoxide. Experimental results indicate that the vanadium yield can reach 68% or more as the vanadium electrolyte is recovered by the method, in the obtained vanadium pentoxide, calcium, magnesium, iron and manganese impurity level is lower than or equal to 0.005%, sodium, silicon and chromium impurity level is lower than or equal to 0.01%, impurity content is low, product purity is high, and the requirement of current vanadium for vanadium battery electrolyte is met. The whole recovery process is simple and environmentally friendly, and industrial production can be realized.

Description

technical field [0001] The invention relates to a preparation method of vanadium pentoxide and belongs to the field of chemical materials. Background technique [0002] All-vanadium redox flow battery (referred to as vanadium battery) is a new type of clean electrochemical energy storage device, which has the characteristics of long service life, high energy conversion efficiency, capacity can be adjusted according to user requirements, high safety performance and environmental friendliness. One of the key components in a vanadium battery is the electrolyte. Theoretically, the electrolyte of a vanadium battery can be used indefinitely. The battery system is continuously charged and discharged, and the basic parameters of the vanadium electrolyte will change. The main performance is that the concentration of vanadium ions and sulfuric acid changes, crystallization and precipitation appear in the electrolyte, and the valence state of the vanadium ions at the positive and negat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G31/02
CPCC01G31/02C01P2006/80
Inventor 李道玉彭穗杨小琴龙秀丽
Owner PANGANG GROUP RESEARCH INSTITUTE CO LTD
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