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Preparation method for vanadyl sulfate electrolyte of all-vanadium flow battery

A technology for the preparation of all-vanadium redox flow batteries and electrolytes, which is applied in the direction of regenerative fuel cells, chemical instruments and methods, vanadium compounds, etc., can solve the problems of complex process and high cost, and achieve the goal of simple process, low cost and large-scale production Effect

Active Publication Date: 2012-09-19
GUANGDONG INST OF RARE METALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method also needs to prepare high-purity vanadium oxide, and the process is more complicated and the cost is higher.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Get 1000ml concentration and be 0.7mol / L, the vanadyl sulfate solution of pH value 0.23, this solution contains impurities such as iron, manganese, chromium, aluminum, titanium, magnesium and calcium, wherein contains iron 1.6g / L, iron and vanadyl sulfate Mass ratio is 0.015, VOSO 4 / ∑Me mass ratio4 / ΣMe mass ratio > 1200;

[0028] In the above-mentioned vanadyl sulfate stripping solution, add analytical pure ammonia water to adjust pH=2.75, add ascorbic acid with a vanadium content of 0.75% to adjust the potential value of the solution to 170mV, stir and dissolve at a slow speed; use P204: TBP: sulfonated kerosene weight ratio is 30 : 10: 60 extraction agent three-stage countercurrent extraction, compare O / A=3: 1, time 7min, after two-phase separation, wash vanadium-loaded organic phase with the dilute sulfuric acid solution of 2g / L, compare O / A= 5:1, washing time 3min. Using 100g / L of sulfuric acid solution for three-stage countercurrent back extraction, compared wi...

Embodiment 2

[0031] Get 1000ml concentration and be 0.2mol / L, the vanadyl sulfate solution of pH value 0.60, this solution contains impurities such as iron, manganese, chromium, aluminum, titanium, magnesium and calcium, wherein contains iron 0.55g / L, iron and vanadyl sulfate The mass ratio is 0.018, VOSO 4 / ∑Me mass ratio4 / ∑Me mass ratio > 1500;

[0032] In the above-mentioned vanadyl sulfate stripping solution, add analytical pure ammonia water to adjust pH=2.50, add ascorbic acid with a vanadium content of 0.5% to adjust the potential value of the solution to 190mV, stir and dissolve at a slow speed; use P507: TBP: sulfonated kerosene weight ratio is 30 : 10: 60 extraction agent three-stage countercurrent extraction, compare O / A=3: 1, time 7min, after two-phase separation, wash vanadium-loaded organic phase with the dilute sulfuric acid solution of 3g / L, compare O / A= 5:1, washing time 3min. Use 100g / L of sulfuric acid solution for three-stage countercurrent back extraction, compared w...

Embodiment 3

[0035] Take 500ml of vanadyl sulfate solution with a concentration of 0.5mol / L and a pH value of -0.12. This solution contains impurities such as iron, manganese, chromium, aluminum, titanium, magnesium and calcium, and contains 0.7g / L of iron, iron and oxygen sulfate Vanadium mass ratio is 0.009, VOSO 4 / ∑Me mass ratio4 / ∑Me mass ratio > 2600;

[0036] In the above-mentioned vanadyl sulfate stripping solution, add analytical pure ammonia water to adjust pH=2.75, add ascorbic acid with a vanadium content of 0.3% to adjust the solution potential value to 158mV, stir and dissolve at a slow speed; use P507: TBP: sulfonated kerosene weight ratio is 10 : 10:80 extraction agent three-stage countercurrent extraction, compare O / A=3: 1, time 12min, after two-phase separation, wash vanadium-loaded organic phase with the dilute sulfuric acid solution of 2g / L, compare O / A= 4:1, washing time 3min. Using 100g / L of sulfuric acid solution for three-stage countercurrent back extraction, comp...

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PUM

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Abstract

The invention discloses a preparation method for vanadyl sulfate electrolyte of an all-vanadium flow battery. The preparation method is characterized by comprising the following steps of: adjusting pH value of vanadyl sulfate solution obtained from leaching vanadium slag and stone coal, back extracting and resin-analyzing treatments by using oxide or hydroxide of alkali metal or alkaline earth; adding an inorganic reducing agent; performing multi-grade counter-current extraction by using P204 or P507: TBP: sulfonated kerosene extracting agent; after the two-phase separation, washing the vanadium-loaded organic phase; performing 2-5 grades of multi-grade counter-current back extraction on the vanadium-loaded organic phase by using sulfuric acid solution to obtain the back extracting liquid of vanadyl sulfate; adjusting the pH value of the back extracting liquid of vanadyl sulfate, adding the organic reducing agent to adjust the potential value of the solution; extracting the solution by using the extracting agent; after the two-phase separation, washing the vanadium-loaded organic phase by using the sulfuric acid solution; performing multi-grade counter-current back extraction by using the sulfuric acid solution to obtain the vanadyl sulfate solution; and distilling until the concentration required for all-vanadium flow battery. The method provided by the invention can improve the purity, simplify the preparation procedure and reduce the cost.

Description

technical field [0001] The invention relates to a method for preparing a battery electrolyte, in particular to a method for preparing a vanadyl sulfate electrolyte for an all-vanadium redox flow battery. Background technique [0002] Vanadium redox flow battery (VRB) is an excellent energy storage device. The capacity of the battery depends on the amount of electrolyte and the concentration of vanadium ions. The electrolyte can be placed separately from the battery. The battery has a long service life, high reliability, and can be quickly charged and discharged. It has great development prospects in photovoltaic power generation, wind power generation, peak shaving and valley filling. VRB batteries have no solid-state reaction, no change in the structure and form of electrode materials, and are cheap, safe and environmentally friendly, and low in operation and maintenance costs. [0003] A VRB battery consists of two electrolyte pools and layers of battery cells. The elec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M8/18C01G31/00
CPCY02E60/528Y02E60/50
Inventor 郭秋松戴子林
Owner GUANGDONG INST OF RARE METALS
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