Preparation method of vanadium battery electrolyte solution with high purity and high concentration

A high-concentration, high-purity technology, applied in the direction of regenerative fuel cells, etc., can solve the problems of high impurity content and inclusions in vanadium electrolyte, and achieve the effect of reducing production costs and improving product performance

Inactive Publication Date: 2014-01-15
NO 63971 TROOPS PLA
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  • Description
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Problems solved by technology

These two methods adopt the hydrolysis method of tetravalent vanadium to separate vanadium from the vanadium stock solution, and the tetravalent vanadic acid is colloidal precipitation with more inclusions, so the impurity content of the vanadium electrolyte obtained by this method should still be relatively high

Method used

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  • Preparation method of vanadium battery electrolyte solution with high purity and high concentration
  • Preparation method of vanadium battery electrolyte solution with high purity and high concentration

Examples

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Effect test

example 1

[0020] In 10 liters of standard pentavalent vanadium stock solution, the vanadium concentration is 0.4M, other impurities include silicate, chromate, and phosphate, and cations include iron, calcium, magnesium, and manganese ions.

[0021] 1. Remove impurities

[0022] Silicon removal: Take 10 liters of the stock solution, adjust the pH of the stock solution to 9, add aluminum sulfate (according to the ratio of Si:Al=1:1.2), and keep the pH of the stock solution at 9 during stirring for 2 hours. After standing for 12 h, the precipitate was filtered.

[0023] Calcium removal: add sodium carbonate (according to Ca:CO 3 2- =1:1 ratio), adjust the pH of the filtrate to 11, heat to 100 degrees and then cool slowly, let stand for 12h, and filter the precipitate.

[0024] 2. Ammonia precipitation (basic ammonia precipitation after acidic ammonia precipitation)

[0025] Acidic ammonia precipitation: take out 10 liters of the stock solution after removing impurities, adjust the aci...

example 2

[0034] In 10 liters of standard pentavalent vanadium stock solution, the concentration of vanadium is 0.6M, other impurities include silicate, chromate, and phosphate, and cations include iron, calcium, magnesium, and manganese.

[0035] 1. Remove impurities

[0036] Silicon removal: Take 10 liters of the stock solution, adjust the pH of the stock solution to 9, add aluminum sulfate (according to the ratio of Si:Al=1:1.2), and keep the pH of the stock solution at 9 during stirring for 2 hours. After standing for 12 h, the precipitate was filtered.

[0037] Calcium removal: add sodium carbonate (according to Ca:CO 3 2- =1:1 ratio), adjust the pH of the filtrate to 11, heat to 100 degrees and then cool slowly, let stand for 12h, and filter the precipitate.

[0038] 2. Ammonia precipitation (basic ammonia precipitation after acidic ammonia precipitation)

[0039] Acidic ammonia precipitation: take out 10 liters of the stock solution after removing impurities, adjust the acidi...

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Abstract

The invention relates to a preparation method of a vanadium battery electrolyte solution with high purity and high concentration. The vanadium battery electrolyte solution is different from a traditional vanadium electrolyte solution with vanadium pentoxide as raw material; through the method, a qualified vanadium solution produced by a vanadium factory is adopted as raw material, steps of removing impurities, precipitating vanadium, reducing, extracting and removing oil are carried out, after carrying out processes of four-step impurity removal and one-step reduction, the impurities in the electrolyte solution are effectively removed, and the all-vanadium solution flow battery vanadyl sulfate electrolyte solution with high purity and high concentration and with the concentration of 1-4 M is obtained. The method adopts the initial vanadium solution as the raw material, has the advantages of low cost, simple preparing procedures, and mild reaction conditions, allows the obtained electrolyte solution product to have high purity, and is suitable for application in an all-vanadium solution flow battery.

Description

technical field [0001] The invention relates to the field of preparation of an all-vanadium redox flow battery electrolyte, in particular to the field of preparation of a pentavalent qualified vanadium liquid produced by a vanadium plant to a quadrivalent electrolyte of a redox flow battery. Background technique [0002] Liquid flow batteries are developed from fuel cells. Since the concept was proposed in 1974, they have attracted widespread attention due to their many unique properties. Different from the solid-state active material contained in the anode and cathode of the usual battery, the high and low potential two oxidation-reduction couples used as the active material in the flow battery, two or one of them are dissolved in the liquid storage tank In solution, the solution is pumped through the cell, where oxidation and reduction reactions take place on inert solid electrodes. The flow battery is divided into three layers: single cell (Cell), stack (Stack) and syste...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/18
CPCH01M8/18Y02E60/50
Inventor 徐艳文越华程杰杨裕生曹高萍
Owner NO 63971 TROOPS PLA
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