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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 battery and electrolyte, which is applied in the direction of regenerative fuel cells, etc., can solve the problem that vanadium resources are not well utilized, and achieve the effects of reducing harmful gas emissions, improving conversion rate, and increasing production

Active Publication Date: 2013-12-18
SICHUAN DAZHOU IRON & STEEL GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

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Experimental program
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Effect test

Embodiment 1

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

Embodiment 2

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

Embodiment 3

[0052] 10kgV 2 o 5 Converter vanadium slag mixed with 2.0kg of sodium carbonate was roasted at 780°C for 3 hours in an oxygen-enriched rotary kiln; The extraction time is 30 minutes, and after each leaching, it is loaded in a hopper with a filter cloth and a solution collector at the bottom, and the three filtrates are combined to obtain 100L of sodium metavanadate leaching solution; a small amount of sodium carbonate solid is added to the leaching solution to adjust the pH value to 13.5, after stirring in the reactor for a period of time, pour it into the hopper with filter cloth and solution collector at the bottom, and filter to obtain 100L filtrate; add a small amount of calcium chloride to the obtained filtrate, stir in the reactor for a period of time, then pour Cloth and the hopper of solution collector, filter to obtain 100L filtrate; Gained filtrate adds a small amount of aluminum sulfate and stirs in the reactor for a period of time, pours in the hopper with filter ...

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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 a battery electrolyte, in particular to a method for preparing an electrolyte for an all-vanadium redox flow battery. Background technique [0002] All-vanadium redox flow battery, referred to as vanadium battery, is a kind of vanadium ion electrolyte solution containing different valence states 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 all-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 co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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