Method for preparing vanadium, chromium, aluminum and silicon products through gradient separation of vanadium shale

The method enhances vanadium extraction from vanadium slag by using sodium hydroxide and organic solvents to achieve high extraction rates and purity in vanadium, chromium, and aluminum products, reducing waste and improving recovery rates.

CN120308969APending Publication Date: 2025-07-15WUHAN UNIV OF SCI & TECH
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Patent Information

Application Number
CN202510531417.9
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-04-25
Publication Date
2025-07-15

AI Technical Summary

Technical Problem

The existing vanadium shale vanadium extraction process has problems such as low leaching rate, large slag volume, low product purity and low recovery rate, and it is difficult to effectively separate elements such as vanadium, chromium, aluminum and silicon.

Method used

The vanadium shale fine abrasive and sodium hydroxide were used to calcinate and water immerse, combined with a mixed solution of cetyl trimethyl ammonium bromide and sodium carboxyformate. By adjusting the pH value and extraction and separation technology, vanadium, chromium, aluminum and silicon were gradually separated, and finally the corresponding products were prepared after calcination.

Benefits of technology

The leaching and recovery rate of vanadium and silicon is improved, the tailings generation amount is reduced, and the product purity is enhanced, especially the purity of vanadium pentoxide, white carbon black and aluminum trioxide is achieved, and efficient step separation is achieved.

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Abstract

The invention relates to a method for preparing vanadium, chromium, aluminum and silicon products through gradient separation of vanadium shale. According to the technical scheme, silicon in the vanadium shale alkaline leaching solution is removed through a sulfuric acid precipitation method, and a desilicication solution and a siliceous precursor I are obtained; washing the siliceous precursor I with sulfuric acid, washing with water and calcining to obtain white carbon black; carrying out vanadium-chromium co-extraction on the desilicication liquid by adopting an amine extraction agent to obtain a vanadium-chromium organic phase; carrying out vanadium-aluminum extraction separation on the washing liquid by adopting an amine extraction agent to obtain a vanadium-rich organic phase and an aluminum-containing raffinate; the vanadium-rich organic phase and the vanadium-chromium organic phase are mixed, vanadium-chromium separation is achieved through step-by-step reverse extraction, and vanadium-rich liquid and chromium-rich liquid are obtained; adjusting the pH value of the aluminum-containing raffinate to precipitate aluminum hydroxide, and calcining to obtain aluminum oxide; carrying out ammonium salt vanadium precipitation on the vanadium-rich liquid to obtain ammonium polyvanadate, and calcining to obtain vanadium pentoxide; and reducing the chromium-rich liquid, adjusting the pH value, precipitating chromium hydroxide, and calcining to obtain chromium sesquioxide. The method is high in leaching rate, small in slag amount, high in product purity and high in recovery rate.
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