Copper removal method for vanadyl sulfate electrolyte of all-vanadium redox flow battery

A technology of all-vanadium redox flow battery and vanadyl sulfate, which is applied in acidic electrolytes, fuel cells, aqueous electrolytes, etc., can solve problems such as the method and effect of removing impurities and copper that are not mentioned, and achieve the effect of avoiding acid dissolution loss

Active Publication Date: 2018-10-16
GUANGDONG INST OF RARE METALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] CN201710031190.7 discloses a method for preparing high-purity vanadyl sulfate, which uses a strong alkaline solution to dissolve vanadium salt or vanadium compound, then adds strong reducing properties to obtain a tetravalent vanadium compound solution for precipitation and separation, and then dissolves to obtain a high-purity vanadyl sulfate solution , the method does not mention the method and effect of removing impurities, especially copper

Method used

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Experimental program
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Effect test

Embodiment 1

[0021] Take 1000ml concentration of 1.0mol / L vanadyl sulfate solution purified by multi-stage extraction back extraction, this solution does not contain metal impurities such as iron, manganese, chromium, aluminum, titanium, magnesium and calcium, and the copper content is 60mg / L . Use sodium hydroxide to adjust the pH of the vanadyl sulfate solution to 4.5. With stirring at a rotational speed of 120 rpm, add iron powder as a metal replacement agent 1.5 times the mass of copper, stir for 25 minutes, then add 1ml of 25% hydrogen peroxide, continue stirring for 12 minutes, and then let it stand 100min; filter, add the reducing agent sodium pyrosulfite of copper quality 1 / 2 in filtrate; Use the extraction agent that the volume ratio of P204:TBP:sulfonated kerosene is 20:5:75, compare O / A=2:1, Extraction time 5min, multi-stage countercurrent extraction of the above-mentioned solution, the number of stages is 3, after the two phases are separated, wash the vanadium-loaded organic p...

Embodiment 2

[0023] Take 1000ml concentration of 1.8mol / L vanadyl sulfate solution purified by multi-stage extraction back extraction, this solution does not contain metal impurities such as iron, manganese, chromium, aluminum, titanium, magnesium and calcium, and the copper content is 70mg / L . Use sodium carbonate to adjust the pH of the vanadyl sulfate solution to 5.2. Under stirring at a speed of 120rpm, add zinc powder as a metal replacement agent 1.5 times the copper mass, stir for 30min, then add 1ml of 25% hydrogen peroxide, continue stirring for 15min, and then let stand for 120min ; Filtrate, add the reducing agent sodium sulfite of copper quality 1 / 2 in filtrate; With the extraction agent that the volume ratio of P204:sulfonated kerosene is 25:75, compare O / A=3:1, extraction time 10min, multistage Countercurrent extraction of the above solution, the number of stages is 4, after the two phases are separated, the vanadium-loaded organic phase is washed with deionized water; the van...

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Abstract

The invention relates to a copper removal method for a vanadyl sulfate electrolyte of an all-vanadium redox flow battery. The vanadyl sulfate electrolyte is a solution by vanadium slag and stone coalleaching, re-extraction and resin analysis, after multi-stage counter-current extraction and impurity removal, the vanadyl sulfate concentration is (0.5-2.0)mol / L, and copper content is larger than 50mg / L. The copper removal method comprises the following steps of adjusting pH of a vanadyl sulfate solution to be 4.0-5.5 with an alkali compound, and adding a metal replacement agent; adding hydrogenperoxide, performing standing and filtering, and adding a reducing agent into a filtering liquid; extracting the solution by P204:TBT:sulfonated kerosene extraction agent, and washing a vanadium-carried organic phase with deionized water after two-phase separation; and re-extracting the vanadium-carried organic phase with a sulfuric acid solution, and obtaining copper-removed vanadyl sulfate electrolyte after two-phase separation. With the copper removal method for the vanadyl sulfate electrolyte, provided by the invention, impurity copper contained in the vanadyl sulfate electrolyte can be removed, and the comprehensive electrical performance of the electrolyte can be effectively improved. The method is simple and reliable in process, good in copper removal effect and low in production cost, and the obtained reaction copper slag can be recycled.

Description

technical field [0001] The invention relates to a method for removing copper from a battery electrolyte, in particular to a method for removing copper from a vanadyl sulfate electrolyte of an all-vanadium redox flow battery. Background technique [0002] The all-vanadium redox flow battery is a kind of electrical energy storage and conversion device that has received widespread attention. It occupies a small area and has no potential safety hazards of inflammability and explosion. The capacity of the battery depends on the amount of electrolyte and the concentration of vanadium ions. The capacity can be adjusted arbitrarily. The electrolyte can be placed separately from the battery. The battery has a long service life, good safety performance, high reliability, and can be charged and discharged quickly. There are great prospects for development in aspects such as cutting valleys and flat peaks. Since the all-vanadium redox flow battery adopts liquid-liquid chemical reaction...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/18C01G31/00
CPCC01G31/00H01M8/188H01M2300/0011Y02E60/50
Inventor 郭秋松刘志强曹洪杨张魁芳李伟朱薇高远陶进长
Owner GUANGDONG INST OF RARE METALS
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