Regeneration method of waste vanadium energy storage medium
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A technology of energy storage medium and alkaline substances, which is applied in the fields of regenerative fuel cells, chemical instruments and methods, electrochemical generators, etc., can solve the problems of high energy consumption cost, complex process, etc. Effect
Pending Publication Date: 2022-03-25
DALIAN RONGKE ENERGY STORAGE GRP CO LTD
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[0009] The purpose of the present invention is to address the complex process and high cost of energy consumption in the current regeneration of vanadium energy storage media, and the final products of the recovery method are mostly vanadium oxides and vanadates, etc., and there is little mention of waste vanadium energy storage materials containing impurity elements. For the regeneration method of the medium, a regeneration method for waste vanadium energy storage medium is proposed, which can separate the impurity elements in the vanadium energy storage medium to achieve the purpose of regeneration
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Embodiment 1
[0041] This embodiment discloses a method for regenerating waste vanadium energy storage media, including the following steps:
[0042] Step 1, sulfuric acid system vanadium energy storage medium V=1.6mol / L, SO 4 2- =4.2mol / L, the average valence state is 4.8 valence, the Na content of the impurity element is 80mg / L, the content of Fe is 50mg / L exceeding the standard, and the rest of the impurity elements meet the standard;
[0043] Step 2. Charge the vanadium in the solution to an average valence of 4.00 by charging the positive electrode;
[0044] Step 3, add water to dilute the vanadium concentration of the solution to 70g / L, add sodium hydroxide to adjust the pH value of the vanadium solution to 2-3, and obtain the pre-extraction solution;
[0045] Step 4. Use organic phase 30% P204+70% sulfonated kerosene as the extractant, and compare O / A=0.8 for extraction; use pure water as the detergent for loading the organic phase, and compare O / A=20 for water washing , 4.2mol / L ...
Embodiment 2
[0049] This embodiment discloses a method for regenerating waste vanadium energy storage media, including the following steps:
[0050] Step 1. Hydrochloric acid system vanadium energy storage medium V=2.4mol / L, Cl - =9.0mol / L, the average valence state is 4.5, the K content of the impurity element is 300mg / L, the Cr content of 30mg / L exceeds the standard, and the rest of the impurity elements meet the standard;
[0051] Step 2. Charge the vanadium in the solution to an average valence of 4.00 by charging the positive electrode;
[0052] Step 3, add water to dilute the vanadium concentration of the solution to 50g / L, add sodium carbonate to adjust the pH value of the vanadium solution to 2-3, and obtain the pre-extract solution;
[0053] Step 4, using 30% P507+70% sulfonated kerosene as the extractant in the organic phase, and extracting with O / A=1.0; using pure water as the detergent for loading the organic phase, and washing with O / A=20 , 9.0mol / L hydrochloric acid solutio...
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Abstract
The invention provides a regeneration method of a waste vanadium energy storage medium. The regeneration method comprises the following steps: detecting the content of elements in the waste vanadium energy storage medium; the valence state of vanadium is adjusted to 3.98-4.02 valence, and a vanadium solution is obtained; adding pure water or mother liquor to dilute the vanadium solution, and adjusting the pH value of the vanadium solution to obtain a pre-extraction solution; performing counter-current extraction, counter-current washing and counter-current reverse extraction to obtain raffinate, washing liquid and high-purity reverse extraction liquid; the high-purity strip liquor is adjusted to the standard concentration of the vanadium energy storage medium, the valence state is adjusted through electrolysis, and the regenerated vanadium energy storage medium is obtained; adjusting the pH values of the raffinate and the water washing liquid, adding an oxidizing agent or oxidizing tetravalent vanadium into pentavalent vanadium by adopting electrolytic oxidation, carrying out ion exchange through resin, and recovering vanadium in the raffinate and the water washing liquid to obtain vanadium post-liquid; and crystallizing the post-vanadium liquid to obtain mother liquor and crystals. According to the method, impurity elements in the vanadium energy storage medium can be separated, and the purpose of regeneration is achieved.
Description
technical field [0001] The invention relates to energy storage medium recovery technology, in particular to a regeneration method for waste vanadium energy storage medium. Background technique [0002] The all-vanadium redox flow battery is the most mature flow battery in technology at present, and it is also a kind of green energy storage battery with great development prospects. It does not produce harmful substances in the process of manufacture, use and disposal. Since its inception, it has received widespread attention at home and abroad and has developed rapidly. It can be used as a backup power source for buildings, airports, and program-controlled switching stations. It can also be used as a supporting energy storage device for clean power generation systems such as solar energy. It can provide power for submarines and ocean-going ships and be used in power grids. Peak shaving etc. [0003] The vanadium energy storage medium is not only the ion conductor of the batt...
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