Method for preparing VOSO4 electrolyte through gas enhanced reduction and reverse extraction

Through the gas-enhanced reduction stripping method, using phosphoric acid as an extraction inhibitor, combined with the gas-inlet stripping process, the vanadyl sulfate electrolyte is directly prepared, solving the problems of complex process, high cost and poor stability in the existing electrolyte preparation methods, and achieving the effect of simplifying the process, reducing costs and improving stability.

CN119706931AActive Publication Date: 2025-03-28DALIAN RONGKE ENERGY STORAGE GRP CO LTD
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Patent Information

Application Number
CN202411895346.2
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2024-12-21
Publication Date
2025-03-28
Estimated Expiration
2044-12-21

AI Technical Summary

Technical Problem

The existing preparation methods for all vanadium liquid flow battery electrolytes have problems such as long process flow, cumbersome operation, high cost, poor stability and environmental pollution. In particular, the use of organic amine extractant in the extraction electrolytic method has abnormal phase separation and inability to regenerate due to high concentration of acid stripping.

Method used

The gas-enhanced reduction stripping method is used to directly prepare the vanadate sulfate electrolyte solution by adding phosphoric acid to the acidic vanadium-containing solution as an extraction inhibitor, and gas is introduced during the stripping process to enhance the interface reaction.

Benefits of technology

This method simplifies the process flow, reduces operational difficulty and cost, improves the stability and recovery rate of the electrolyte, avoids the abnormal phase separation problem of the organic phase, and realizes a green and environmentally friendly production process.

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Abstract

The invention provides a method for preparing VOSO4 electrolyte through gas enhanced reduction and reverse extraction, which comprises the following steps: adding an extraction inhibitor into an acidic vanadium-containing solution, stirring and reacting to obtain a vanadium-containing solution, the extraction inhibitor being phosphoric acid and / or a phosphoric acid compound; adjusting the pH value of the solution to 0.5-3.0 by using sulfuric acid, mixing with an organic phase, extracting, and separating liquid to obtain a vanadium-loaded organic phase; washing the vanadium-loaded organic phase with dilute sulfuric acid; a stripping agent and the vanadium-loaded organic phase are mixed for stripping, meanwhile, gas is introduced for strengthening the stripping process, and a no-load organic phase and a vanadium electrolyte are obtained; and the vanadium strip liquor is subjected to galvanic pile electrolysis adjustment, and the vanadium electrolyte with the valence state meeting the standard is obtained. The invention provides a novel process for directly preparing the vanadyl sulfate electrolyte through gas reinforced reduction, and the novel process has the advantages of being simple in process, easy to operate, low in cost and environmentally friendly.
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