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Preparation method of electrolyte used in all-vanadium redox flow battery

A technology for the preparation of all-vanadium redox flow batteries and electrolytes, applied in the direction of regenerative fuel cells, etc., can solve the problems of vanadium resources not being well utilized, reduce harmful gas emissions, reduce production costs, and reduce environmental pollution Effect

Active Publication Date: 2012-07-11
SICHUAN DAZHOU IRON & STEEL GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These rich resources of vanadium are usually not well utilized, but are treated as waste

Method used

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  • Preparation method of electrolyte used in all-vanadium redox flow battery
  • Preparation method of electrolyte used in all-vanadium redox flow battery

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] 100gV 2 O 5 The powder and 300g of sodium carbonate were roasted in an oxygen-enriched rotary kiln at 800°C for 2 hours. They were leached three times with 300mL of water at a temperature of 80°C, and then filtered. The leaching time was 20 minutes each time; the three filtrates were combined to obtain a bias. 900mL of sodium vanadate leaching solution; adding a small amount of sodium carbonate solid to the leaching solution to adjust the pH to 10, stirring and filtering to obtain 1000mL filtrate; adding a small amount of calcium chloride to the resulting filtrate, stirring and filtering to obtain 1100mL filtrate; adding a small amount of aluminum sulfate to the resulting filtrate After stirring, filter to obtain 1200mL filtrate; add 0.5N sulfuric acid to adjust the pH value of the obtained filtrate to 3, and add 80mL concentrated hydrochloric acid to the resulting sodium metavanadate solution to undergo redox reaction to obtain 1200mL0.41mol / L vanadyl sulfate VOSO 4 Solut...

Embodiment 2

[0050] 100gV 2 O 5 The powder and 300g of sodium carbonate were roasted in an oxygen-enriched rotary kiln at 800°C for 2 hours. They were leached three times with 300mL of water at a temperature of 85°C and then filtered. The leaching time was 20 minutes each time; the three filtrates were combined to obtain a partial 900mL of sodium vanadate leaching solution; adding a small amount of sodium carbonate solid to the leaching solution to adjust the pH to 10, stirring and filtering to obtain 1000mL filtrate; adding a small amount of calcium chloride to the resulting filtrate, and filtering after stirring to obtain 1100mL filtrate; adding a small amount of aluminum sulfate to the resulting filtrate After stirring, filter to obtain 1200mL filtrate; add 0.5N sulfuric acid to adjust the pH of the obtained filtrate to 3, and add 80mL concentrated hydrochloric acid to the resulting sodium metavanadate solution to undergo redox reaction to obtain 1200mL0.43mol / L vanadyl sulfate VOSO 4 Solu...

Embodiment 3

[0052] 10kgV 2 O 5 The converter vanadium slag solid is mixed with 2.0kg sodium carbonate and roasted in an oxygen-rich rotary kiln at 780℃ for 3 hours; after roasting, the reaction mixture is leached three times with 100L of water at 90℃ to extract sodium vanadate in the solid reaction mixture. The extraction time is 30 minutes. After each extraction, it is loaded in a hopper with a filter cloth and a solution collector at the bottom. The three filtrates are combined to obtain 100L of sodium metavanadate extract; a small amount of sodium carbonate solid is added to the extract to adjust the pH value 13.5. After stirring in the reactor for a period of time, it is also poured into a hopper with a filter cloth and a solution collector at the bottom, and filtered to obtain 100L of filtrate; the filtrate is added with a small amount of calcium chloride and stirred in the reactor for a period of time, and then poured into the bottom for filtration. In the hopper of the cloth and solu...

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Abstract

The invention discloses a preparation method of electrolyte used in an all-vanadium redox flow battery. The method comprises the steps that: vanadium slag is roasted by using sodium salt, and is processed through aqueous extraction and impurity removing, such that a sodium metavanadate solution is prepared; the sodium metavanadate solution is subject to acid modulation, and is subject to a reaction with concentrated hydrochloric acid, such that a VOSO4 solution is obtained; the VOSO4 solution is concentrated, such that the all-vanadium redox flow battery electrolyte is obtained. With the preparation method, the pollution to the environment can be effectively avoided, and production cost can be reduced. The method is beneficial for large-scaled productions. Also, with the method, existing vanadium resources such as vanadium slag can be reasonably utilized, such that vanadium resource waste is avoided, and production cost is reduced.

Description

Technical field [0001] The invention relates to a method for preparing battery electrolyte, in particular to a method for preparing electrolyte for all vanadium redox flow batteries. Background technique [0002] All-vanadium flow battery is abbreviated as vanadium battery. It uses an electrolyte containing vanadium ions with different valences that undergoes reduction and oxidation reactions under external drive as the active material on its positive and negative electrodes to complete the charge and discharge process. Battery. The vanadium redox flow battery has the advantages of long service life, high energy conversion rate, safety and environmental protection, and adjustable capacity. The working principle of its electrolyte is as follows: [0003] Negative reaction: V 2+ -e - =V 3+ E 0 = -0.26V [0004] Positive reaction: VO 2 + +2H + +e - =VO 2+ +H 2 O E 0 =1.00V [0005] It can be seen from the above that the core of the vanadium battery is the electrolyte. ...

Claims

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Application Information

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IPC IPC(8): H01M8/18
CPCY02E60/528Y02E60/50
Inventor 张琦宋龙江王皎月杨海波
Owner SICHUAN DAZHOU IRON & STEEL GROUP
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