Method for preparing vanadium oxide from high concentration sodium vanadate solution

CN116715267BActive Publication Date: 2026-06-26PANGANG GROUP RESEARCH INSTITUTE CO LTD
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Patent Information

Application Number
CN202310857680.8
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2023-07-12
Publication Date
2026-06-26
Estimated Expiration
2043-07-12

AI Technical Summary

Technical Problem

In existing vanadium extraction processes from vanadium slag, high-concentration vanadium solutions are prone to hydrolysis, leading to increased wastewater volume and poor quality of ammonium polyvanadate.

Method used

Vanadium is precipitated by direct hydrolysis of high-concentration vanadium solution, and the filter cake is converted into ammonium polyvanadate using a low-sodium ammonium solution. Vanadium oxide is then obtained by calcination or reduction, which reduces the amount of wastewater to be treated and ensures the quality of ammonium polyvanadate.

Benefits of technology

It effectively reduces vanadium precipitation wastewater, lowers wastewater treatment costs, improves the quality and stability of ammonium polyvanadate, enables wastewater recycling, and reduces the amount of ammonium salt used.

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Abstract

The application discloses a method for preparing vanadium oxide from high-concentration vanadium sodium solution, which comprises the following steps: S1, directly hydrolyzing and precipitating vanadium from high-concentration vanadium solution with a vanadium concentration of 40-140 g / L to obtain filter cake after filtration; S2, beating the filter cake with low-sodium ammonium-containing solution with a sodium concentration of less than or equal to 25 g / L, and then performing crystallization by adding acid to the obtained slurry to adjust the pH to 2.0-2.5 and by heating to 80-90 DEG C, and then obtaining ammonium polyvanadate after filtration; and S3, calcining or reducing the ammonium polyvanadate to obtain vanadium oxide. The application can reduce vanadium precipitation wastewater, improve the quality of ammonium polyvanadate, and also can reduce the use amount of ammonium salt.
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Citation Information

Patent Citations

  • Vanadium precipitation method for reducing vanadium precipitation wastewater

    CN105967233B

  • Concentration and cold-precipitation separation method of sodium sulfate and ammonium sulfate from vanadium-precipitation mother liquor high-salt wastewater

    CN102249262A

  • Method for refining vanadium pentoxide from vanadium liquid

    CN115196677A

  • Preparation method of low-sodium ammonium polyvanadate

    CN115849444A