Method for preparing approximately 3.5-valent vanadium electrolyte by reducing ammonium metavanadate through coke oven gas

By reducing ammonium metavanadate with coke oven gas and combining it with argon displacement to remove ammonia, the problem of long process and high cost in the preparation of vanadium oxysulfate electrolyte in the existing technology has been solved. This method achieves efficient and economical preparation from ammonium metavanadate to high vanadium concentration, and realizes the preparation of efficient and low-cost vanadium oxysulfate electrolyte. It simplifies the process flow and prepares efficient and low-cost vanadium oxysulfate electrolyte with high vanadium concentration and low ammonia content.

CN121097155APending Publication Date: 2025-12-09INSTITUTE OF PROCESS ENGINEERING CHINESE ACADEMY OF SCIENCES
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Patent Information

Application Number
CN202511360973.0
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-09-23
Publication Date
2025-12-09

AI Technical Summary

Technical Problem

Existing methods for preparing vanadium oxysulfate electrolyte are lengthy, costly, and difficult to remove reducing/extracting agent residues. Furthermore, the electrolyte is large in volume and difficult to transport over long distances, making it impossible to accurately obtain vanadium oxysulfate electrolyte.

Method used

Ammonium metavanadate was reduced using coke oven gas. By controlling the reduction and calcination process at low temperatures, a mixed near-3.5 vanadium oxide with V8O15, V6O11, V4O7 and V2O3 as the main phases was generated. Argon gas was used to replace and remove ammonia at the end of the high-temperature calcination to obtain easily soluble near-3.5 vanadium oxide. Subsequently, it was reacted with sulfuric acid solution to prepare a 3.5 vanadium electrolyte.

Benefits of technology

A short-process preparation of 3.5-valent vanadium electrolyte with high vanadium concentration and low ammonia content was achieved from ammonium metavanadate, significantly reducing production costs. The ammonia content in the electrolyte is less than 20 ppm, and the vanadium concentration is ≥1.7 mol/L, simplifying the process.

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Abstract

The invention provides a method for preparing a nearly 3.5-valent vanadium electrolyte by reducing ammonium metavanadate with coke oven gas, which comprises the following steps: (1) reducing and calcining ammonium metavanadate in coke oven gas to obtain a reduced product; (2) carrying out replacement deamination on the reduced product in the step (1) to obtain a nearly 3.5-valent vanadium oxide, wherein the nearly 3.5-valent vanadium oxide contains V4O7; and (3) a mixed sulfuric acid solution and the approximately 3.5-valent vanadium oxide are subjected to a dissolution reaction, and the approximately 3.5-valent vanadium electrolyte is obtained. The process method disclosed by the invention is simple and easy to implement, the approximately 3.5 valence vanadyl sulfate electrolyte product with high vanadium concentration and low ammonia content can be obtained by taking the ammonium metavanadate and the coke oven gas as raw materials, and the application prospect is wide.
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