Combined chemical-electrochemical method for preparing vanadium redox flow battery electrolyte

A vanadium redox flow battery and electrolyte technology, which is applied to chemical instruments and methods, electrochemical generators, vanadium compounds, etc., can solve the problems of low vanadium extraction rate, high inclusions, and increased costs, and achieve high product purity and reagent cheap effect

Inactive Publication Date: 2014-09-10
NO 63971 TROOPS PLA +1
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Problems solved by technology

The problem with this technical route is mainly that the resulting VO 2 It is colloidal precipitation, with many inclusions and low vanadium extraction rate, which affects the purity of the final product - vanadium electrolyte
Kunming University of Science and Technology obtained the leaching solution of tetravalent vanadium by acid leaching and reduction of ston

Method used

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  • Combined chemical-electrochemical method for preparing vanadium redox flow battery electrolyte
  • Combined chemical-electrochemical method for preparing vanadium redox flow battery electrolyte
  • Combined chemical-electrochemical method for preparing vanadium redox flow battery electrolyte

Examples

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Effect test

Embodiment 1

[0026] Take 5000 ml of NaVO containing vanadium 0.4M 3 solution, adjust the pH value of the solution to 9, add aluminum sulfate (according to the molar ratio of Si:Al=1:1.2), heat and stir for 2 hours, then let it stand for 12 hours, and filter the precipitate. According to Ca:CO in the filtrate 32- =1:1 molar ratio Add sodium carbonate, adjust the pH of the filtrate to 10, heat to boil and then cool slowly, let stand for 12h, precipitate and filter. Add the above-mentioned NaVO after preliminary impurity removal and purification into the reaction kettle 3 solution, adjust the acidity of the solution to pH 5, according to NH 4 + : Add ammonium chloride at a molar ratio of V=1:3, after stirring for 1h, adjust the pH=2 of the solution, stir for 2h under the condition of a constant temperature of 90°C, leave it for 24h, filter to obtain NH 4 VO 3 precipitation. Add an appropriate amount of purified water with ammonia water to adjust the pH value of the solution to 9, stir f...

Embodiment 2

[0029] Take 6000 ml of NaVO containing vanadium 0.3M 3 solution, adjust the pH value of the solution to 9, add aluminum sulfate (according to the molar ratio of Si:Al=1:1.4), heat and stir for 2 hours, then let stand for 12 hours, and filter the precipitate. According to Ca:CO in the filtrate 3 2- =1:1.2 molar ratio Add sodium carbonate, adjust the pH value of the filtrate to 10, heat to boil and then cool slowly, let stand for 12h, precipitate and filter. Add the above-mentioned NaVO after preliminary impurity removal and purification into the reaction kettle 3 solution, adjust the acidity of the solution to pH 5, according to NH 4 + Ammonium chloride was added at a molar ratio of V=2:3, and after stirring for 1 h, the pH of the solution was adjusted=2, stirred for 2 h at a constant temperature of 80° C., left to stand for 12 h, filtered to obtain NH 4 VO 3 precipitation. Add an appropriate amount of pure water with ammonia water to adjust the pH value of the solution ...

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Abstract

The invention relates to a combined chemical-electrochemical method for preparing an all-vanadium redox flow battery electrolyte. The method adopts a solid or solution containing soluble vanadate, especially vanadium slag leachate obtained after steel-making with vanadic titano-magnetite, for production of a high-purity high-concentration vanadium electrolyte. The method is characterized in that a vanadyl sulfate electrolyte with a sulfuric acid concentration of 1 to 6 mol/L and a vanadium concentration of 1 to 5 mol/L can be prepared through impurity removal, acidic vanadium precipitation, multiple alkaline leaching and vanadium precipitation, calcination and reduction, an electrochemical process is cooperatively used so as to prepare a 3.5-valent or 3-valent vanadium electrolyte, and after electrolysis, the vanadium electrolyte of a positive electrode can be repeatedly used through chemical reduction. The method provided by the invention can treat the vanadium slag leachate and the solid or solution containing soluble vanadate and has the advantages of simple process flow, mild reaction conditions, substantially reduced cost, etc.; and the prepared high-purity high-concentration vanadium electrolyte is especially applicable to an all-vanadium redox flow battery.

Description

technical field [0001] The invention relates to the processing and manufacturing technology and the field of electrochemical preparation of an electrolyte solution for an all-vanadium redox flow battery, in particular to a preparation of an electrolyte for producing an all-vanadium redox flow battery from a vanadium slag leaching solution or a solid or solution containing soluble vanadate method. Background technique [0002] The active material of the all-vanadium redox flow battery (VRB) is the same element with good reversibility, which minimizes the impact of positive / negative solution cross-contamination on battery performance, and is conducive to the regeneration of the electrolyte after long-term operation. Therefore, among the existing liquid flow energy storage technologies, the all-vanadium redox flow battery is generally favored, and its unique advantages and successful examples have shown broad application prospects in the energy storage market. [0003] The act...

Claims

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Application Information

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IPC IPC(8): H01M8/18C01G31/00
CPCY02E60/528H01M8/188Y02E60/50
Inventor 文越华栗金刚徐艳程杰徐从美曹高萍杜刚杨裕生白瑞国
Owner NO 63971 TROOPS PLA
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