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Method for preparing vanadyl sulfate by using spent vanadium battery electrolyte

A technology of vanadyl sulfate and electrolyte, applied in fuel cells, regenerative fuel cells, circuits, etc., can solve the problems of easy precipitation, high equipment requirements, complicated procedures, etc., to solve processing problems, increase economic benefits, and simple process Effect

Active Publication Date: 2018-01-05
湖南汇锋高新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can make the vanadium recovery rate more than 80%, there are still some disadvantages
First of all, pentavalent vanadium ions are very easy to precipitate when the temperature is higher than 40°C, and the high-concentration spent electrolyte is likely to be precipitated during the electrolysis process; secondly, the use of organic solvents to reduce pentavalent vanadium ions requires a higher temperature (generally at 100°C or so), the equipment requirements are high, and the amount of reducing agent is difficult to control, it is easy to reduce completely or introduce organic impurities; finally, the whole preparation process is complicated and time-consuming, which is not conducive to large-scale mass production

Method used

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  • Method for preparing vanadyl sulfate by using spent vanadium battery electrolyte

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Embodiment 1

[0046] By chemical titration, the vanadium concentration of the recovered spent electrolyte was measured to be 3.6moL / L, and the average valence state was 4.7. The sulfate concentration of the spent electrolyte was measured to be 4.3moL / L by chemical precipitation. Take 1500mL of the above spent electrolyte solution in the negative electrode pool of the electrolytic cell, and calculate by formula (3) that the electrolysis time is 5.1 hours under the current of 20A. After the electrolysis is completed, the sample solution is subjected to an ultraviolet test, and there is no trivalent or pentavalent absorption peak. The electrolyzed liquid was taken out from the electrolytic cell, evaporated, crystallized and dried to obtain 1010.26 g of blue vanadyl sulfate crystals with a recovery rate of 94.01%.

Embodiment 2

[0048] By chemical titration, the vanadium concentration of the recovered spent electrolyte was measured to be 2.5moL / L, and the average valence state was 3.8. The sulfate concentration of the spent electrolyte was measured to be 4.5moL / L by chemical precipitation. Take 1500mL of the above spent electrolyte solution in the positive electrode pool of the electrolytic cell, and calculate by formula (3) that the electrolysis time is 1.0 hour under the current of 20A. After the electrolysis is completed, the sample solution is subjected to an ultraviolet test, and there is no trivalent or pentavalent absorption peak. The electrolyzed liquid was taken out from the electrolytic cell, evaporated, crystallized and dried to obtain 901.3 g of blue vanadyl sulfate crystals with a recovery rate of 95.02%.

Embodiment 3

[0050] By chemical titration, the vanadium concentration of the recovered spent electrolyte was measured to be 5.2moL / L, and the average valence state was 4.9. The sulfate concentration of the spent electrolyte was measured to be 8.7moL / L by chemical precipitation. Take 750mL of the above spent electrolyte solution in the negative electrode pool of the electrolytic cell, add deionized water to dilute to 1500ml, and calculate by formula (3) that the electrolysis time is 4.6 hours under 20A current. After the electrolysis was completed, the sample solution was subjected to ultraviolet testing, and it was found that there was still a pentavalent vanadium ion absorption peak. According to the tested pentavalent vanadium ion concentration, the electrolysis was continued for 0.1 hour. After the electrolysis was completed, there was no trivalent or pentavalent absorption peak. The electrolyzed liquid was taken out from the electrolytic cell, evaporated, crystallized and dried to obtai...

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Abstract

The invention relates to a method for preparing vanadyl sulfate by using a failure vanadium cell electrolyte. The method comprises the following steps of (A) taking the failure vanadium cell electrolyte as a raw material, testing total vanadium concentration and average valence state of the failure electrolyte by a method of potentiometric titration or cheicaml titration for estimating electrolysis time, and simultaneously testing sulfate radical concentration of the failure electrolyte by a method of chemical deposition; (B) adjusting the vanadium concentration of the failure concentration to be 1-4moL / L, preferably 1.5-3.5moL / L and the sulfate radical concentration to be 2-8moL / L, preferably 3-7moL / L by adding vanadium pentoxide or sulfuric acid and water; (C) carrying out electrolysis on the electrolyte to tetravalence by using an electrolysis groove according to the electrolysis time estimated in the step (A), monitoring the electrolyte, and carrying out electrolysis to trivalent or pentavalent vanadium to obtain a vanadyl sulfate solution; and (D) carrying out evaporation or solvent-out crystallization on the vanadyl sulfate solution to obtain the vanadyl sulfate.

Description

technical field [0001] The invention relates to the field of all-vanadium redox flow batteries, and more specifically relates to the preparation of vanadyl sulfate by utilizing the electrolyte solution of spent vanadium batteries. Background technique [0002] The all-vanadium electrolyte is an important part of the vanadium battery and a carrier for energy storage. In recent years, with the rise of vanadium batteries, the production of all-vanadium electrolytes is increasing. However, as the battery system continues to charge and discharge, the positive and negative electrodes of the all-vanadium electrolyte will not match, resulting in an energy imbalance that cannot be used normally. The treatment of spent electrolyte is an urgent problem faced by many vanadium battery manufacturers. This patent mainly solves the problem of disposing of the invalid electrolyte of the vanadium battery. [0003] The all-vanadium redox flow battery has the advantages of high energy conver...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M8/18
CPCH01M8/188Y02E60/50
Inventor 王远望官清
Owner 湖南汇锋高新能源有限公司
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