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Method for preparing vanadyl sulfate from electrolyte for failure vanadium cell

A vanadyl sulfate, electrolyte technology, applied in the direction of regenerative fuel cells, final product manufacturing, sustainable manufacturing/processing, etc., can solve the problems of energy imbalance of vanadium electrolyte, inability to use waste liquid, etc. High value and significant economic benefits

Active Publication Date: 2013-03-20
辽宁科京新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The object of the present invention is to provide a method for producing vanadyl sulfate by utilizing the electrolyte solution for vanadium batteries that has failed, so as to solve the problem in the prior art that the energy imbalance of the vanadium electrolyte solution cannot be used after repeated use.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Known vanadium concentration is 3mol / L electrolyte 500ml, under the environment of nitrogen protection, charge the vanadium valence state in the solution to pentavalent by charging the positive electrode of the flow battery, adjust the acidity of the solution to ph=5.5, and heat the solution and keep the temperature constant To 90°C, add 50g of ammonium chloride, 30g of ammonium carbonate and 30g of ammonium sulfate, continue to stir for 1 hour, stop heating, keep stirring for 2 hours, let it stand for 24 hours, remove the precipitate and dry it to obtain 185.20g of solid, which was analyzed by mass spectrometry. The molecular weight of the compound is 130.35g / mol. Add 50ml of formic acid, 30ml of ethanol and 10ml of formaldehyde. After fully reducing, let it stand for 24 hours, and process it in a centrifuge at 5000r / min for 20 minutes to obtain 303g of vanadyl sulfate crystals. The recovery rate is 93.13%.

Embodiment 2

[0025] Known vanadium concentration 5mol / L electrolyte 500ml, under the environment of nitrogen protection, the vanadium valence state in the solution is charged to pentavalent by charging the positive electrode of the flow battery, adjust the acidity of the solution to ph=5.5, and heat the solution and keep the temperature To 90°C, add 100g of ammonium chloride, 50g of ammonium carbonate and 40g of ammonium sulfate, continue to stir for 1 hour, stop heating, keep stirring for 2 hours, let stand for 24 hours, remove the precipitate and dry it to obtain 299.15g of solid, which was analyzed by mass spectrometry The molecular weight of the compound is 130.35g / mol. Add 50ml of acetic acid, 50ml of ethanol and 30ml of formaldehyde, let it stand for 24 hours after being fully reduced, and process it in a centrifuge at 5000r / min for 20 minutes to obtain 490.66g of vanadyl sulfate crystals, with a recovery rate of 90.47% .

Embodiment 3

[0027] Known vanadium concentration 1mol / L electrolyte 500ml, in the environment of nitrogen protection, charge the vanadium in the solution to the pentavalent state by charging the positive electrode of the flow battery, adjust the acidity of the solution to ph=5.5, and heat the solution to keep the temperature To 90°C, add 20g of ammonium chloride, 10g of ammonium carbonate and 10g of ammonium sulfate, continue to stir for 1 hour, stop heating, keep stirring for 2 hours, let stand for 24 hours, remove the precipitate and dry to obtain 60.18g of solid, which is analyzed by mass spectrometry The molecular weight of the compound is 130.35g / mol. Add 30ml of acetic acid, 10ml of ethanol and 10ml of acetaldehyde, let it stand for 24 hours after being fully reduced, and process it in a centrifuge at 5000r / min for 20 minutes to obtain 98.51g of vanadyl sulfate crystals. The recovery rate is 90.82 %.

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Abstract

The invention relates to the field of cell recovery and energy storage, particularly relates to a method for preparing vanadyl sulfate from electrolyte for a failure vanadium cell, and solves the problem on waste liquid treatment aspect due to the fact that vanadium electrolyte can not be used as energy is imbalanced after the vanadium electrolyte is used for a plurality of times in the prior art. The failure vanadium electrolyte is taken as a material; the valence state of vanadium in the electrolyte is increased to pentavalence by charging of the cell; a vanadium precipitating agent with proper quantity is added; the pentavalent vanadium is precipitated; and then an organic reducing agent is added and cultivated at the normal temperature to prepare vanadyl sulfate crystals. According to the method, the technique is simple, materials can be easily available, and the vanadium recovery rate can be up to over 80%, so that the method is suitable for industrial mass production; and the operating cost of the vanadium cell is reduced.

Description

technical field [0001] The invention relates to the field of battery recovery and energy storage, in particular to a method for preparing vanadyl sulfate by utilizing an electrolyte solution for a vanadium battery that has failed. Background technique [0002] Vanadium redox flow battery, referred to as vanadium battery. It is a new type of electrochemical energy storage system. Compared with traditional storage batteries, it has the characteristics of fast charging and discharging, large capacity, low self-discharging rate and simple battery structure. It is suitable for large-scale storage of new energy such as wind energy and solar energy. ideal form of power supply. As for the electrolyte of the battery active material, the positive electrode electrolyte is composed of a mixed solution of tetravalent and pentavalent vanadium ions and sulfuric acid, and the negative electrode electrolyte is composed of a mixed solution of divalent and trivalent vanadium ions and sulfuric...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/18
CPCY02E60/528Y02E60/50Y02P70/50
Inventor 秦野张博王丽娟何虹祥刘建国严川伟
Owner 辽宁科京新材料有限公司
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